JP2004223664A - Air-cooling mechanism for hydraulic torque wrench driven by electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-cooling device for a hydraulic torque wrench driven by an electric motor capable of preventing a rise of an internal temperature of the hydraulic torque wrench by an air-cooling effect. <P>SOLUTION: A space 4 is formed on a back face side of the electric motor 2. A fan 5 is disposed to suck air within a hydraulic torque wrench main body via the space 4 and to discharge air from a discharge port 9 formed on a casing on a rear end face of the main body. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００２６】
表１から、電動モータ２の背面側に空間４を形成し、この空間４を介してファン５を配設することによって、油圧式トルクレンチ１の内部温度の上昇を防止できること、さらに、電動モータ２の収容位置のケーシング７の断面積と、電動モータ２の背面側に形成した空間４の位置のケーシング７の断面積とを、略同面積に形成することにより、一層内部温度の上昇を防止できることを確認した。
【００２７】
以上、本発明の電動モータにより駆動される油圧式トルクレンチの空冷装置について、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。
【００２８】
【発明の効果】
本発明の電動モータにより駆動される油圧式トルクレンチの空冷装置によれば、電動モータの背面側に形成した空間を介して、油圧式トルクレンチ本体内の空気を吸引して該本体の後端面から排出するファンを配設するようにしているので、油圧式トルクレンチ本体内の空気を均一に吸引して外部に排出することができ、空冷効果によって油圧式トルクレンチの内部温度の上昇を防止できる。
これにより、特に、打撃トルク発生装置の内部に充填した作動油の温度が上昇することを防止でき、油圧式トルクレンチの能力が変動してナット等の締付力が安定しないという問題点を解消し、安定して長時間の連続作業が可能な電動モータにより駆動される油圧式トルクレンチを提供することができる。
【００２９】
また、電動モータの収容位置のケーシングの断面積と、電動モータの背面側に形成した空間の位置のケーシングの断面積とを、略同面積に形成することにより、電動モータを通して、その前面の油圧式トルクレンチ本体内の空気を均一に吸引して外部に排出することができる。
【００３０】
また、電動モータとファンとの間の距離を２０ｍｍ以上に設定することにより、ファンの負荷を低減し、その能力を最大限に発揮させることができる。
【００３１】
また、打撃トルク発生装置の収容位置より前方のケーシングに吸気口を形成することにより、油圧式トルクレンチ本体内の空気の流通を円滑にし、空冷効果を向上することができる。
【図面の簡単な説明】
【図１】本発明の空冷装置を備えた電動モータにより駆動される油圧式トルクレンチの第１実施例を示し、（ａ）は一部を破断した側面図、（ｂ）は背面図である。
【図２】同断面図である。
【図３】本発明の空冷装置を備えた電動モータにより駆動される油圧式トルクレンチの第２実施例を示し、（ａ）は一部を破断した側面図、（ｂ）は背面図である。
【図４】同断面図である。
【図５】従来の電動モータにより駆動される油圧式トルクレンチを示し、（ａ）は側面図、（ｂ）は背面図である。
【図６】同断面図である。
【符号の説明】
１ 油圧式トルクレンチ
２ 電動モータ
３ 打撃トルク発生装置
４ 空間
５ ファン
６ 制御機器
７ ケーシング
８ 吸気口
９ 排気口[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air cooling mechanism of a hydraulic torque wrench driven by an electric motor.
[0002]
[Prior art]
As a striking torque generating device for a torque wrench, a striking torque generating device in which the working oil is filled with low noise and low vibration has been developed and has been put into practical use.
As shown in FIGS. 5 and 6, this hydraulic torque wrench transmits the rotational torque of a rotor or an electric motor 2 that is driven to rotate by high-pressure air to a striking torque generator 3 filled with hydraulic oil. In the impact torque generating device, the rotational torque is converted into an impact torque.
By rotating the liner by the rotor or the electric motor 2, when the plurality of sealing surfaces formed on the inner peripheral surface of the liner match the sealing surfaces and the blades formed on the outer peripheral surface of the main shaft, the impact torque is applied to the main shaft. And a nut or the like engaged with the tip of the main shaft can be tightened or loosened.
[0003]
This type of hydraulic torque wrench has been widely used to rotate a rotor using high-pressure air as a power source. However, an electric motor is driven to rotate using an easily-handled electric power as a power source. Is transmitted to a striking torque generator filled with hydraulic oil inside, like a conventional hydraulic torque wrench, and this striking torque generator often converts rotational torque into striking torque. It has come to be.
[0004]
By the way, in the case of a hydraulic torque wrench of the type in which the electric motor is rotationally driven by using the electric power, the hydraulic torque wrench of the type in which the rotor is rotationally driven by using the high-pressure air as the power source uses the high-pressure air of the power source. Since the air-cooling effect cannot be expected, the internal temperature of the hydraulic torque wrench tends to rise, and, in particular, the temperature of the hydraulic oil filled inside the striking torque generator raises the capacity of the hydraulic torque wrench. And the tightening force of the nut or the like becomes unstable.
[0005]
For this reason, attempts have been made to provide an air cooling mechanism in the hydraulic torque wrench (see Patent Document 1). However, since the fan is simply disposed inside the hydraulic torque wrench, a required air cooling effect is obtained. It was difficult.
[0006]
[Patent Document 1]
JP-A-59-129675
[Problems to be solved by the invention]
The present invention provides a hydraulic torque wrench driven by this electric motor, by comprehensively verifying the position of the fan and the like, so that the internal temperature of the hydraulic torque wrench can be prevented from rising due to the air cooling effect. It is an object of the present invention to provide an air cooling device of a hydraulic torque wrench driven by an electric motor.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an air-cooling device for a hydraulic torque wrench driven by an electric motor according to the present invention is a hydraulic torque wrench in which a striking torque generator filled with hydraulic oil is driven by an electric motor. In the air cooling mechanism, a fan that sucks air from the hydraulic torque wrench main body and discharges the air from the rear end face of the main body through a space formed on the back side of the electric motor is provided.
[0009]
The air-cooling mechanism of the hydraulic torque wrench driven by the electric motor draws air from the hydraulic torque wrench main body through a space formed on the back side of the electric motor and discharges the air from the rear end face of the main body. The air in the hydraulic torque wrench body can be uniformly sucked and discharged to the outside, and the internal temperature of the hydraulic torque wrench can be prevented from rising due to the air cooling effect.
[0010]
In this case, the sectional area of the casing at the accommodation position of the electric motor and the sectional area of the casing at the position of the space formed on the back side of the electric motor can be formed to have substantially the same area.
[0011]
Thus, the air in the hydraulic torque wrench body on the front surface can be uniformly sucked and discharged to the outside through the electric motor.
[0012]
Further, the distance between the electric motor and the fan can be set to 20 mm or more.
[0013]
As a result, the load on the fan can be reduced and its performance can be maximized.
[0014]
In addition, an intake port can be formed in the casing in front of the housing position of the impact torque generating device.
[0015]
Thereby, the flow of air in the hydraulic torque wrench main body can be made smooth, and the air cooling effect can be improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an air cooling device for a hydraulic torque wrench driven by an electric motor according to the present invention will be described with reference to the drawings.
[0017]
1 and 2 show a first embodiment of a hydraulic torque wrench driven by an electric motor having an air cooling device according to the present invention.
[0018]
The hydraulic torque wrench 1 transmits the rotational torque of the electric motor 2 to a striking torque generator 3 filled with hydraulic oil therein, similarly to the conventional hydraulic torque wrench 1. The torque is converted into an impact torque, and a nut or the like engaged with the tip of the main shaft is tightened or loosened.
[0019]
The hydraulic torque wrench 1 forms a space 4 on the back side of the electric motor 2, and sucks air from the hydraulic torque wrench body through the space 4 to form a casing on a rear end surface of the body. A fan 5 for discharging air from the exhaust port 9 is provided.
[0020]
Thereby, the air in the hydraulic torque wrench main body can be uniformly sucked and discharged to the outside by the fan 5 arranged through the space 4 formed on the back side of the electric motor 2, and the hydraulic pressure is reduced by the air cooling effect. The internal temperature of the torque wrench 1 can be prevented from rising.
[0021]
In this case, the electric motor 2 and the fan 5 are not brought close to each other, but are slightly distance d between them, preferably 20 mm or more (the upper limit is not particularly limited. It is preferable to set the distance up to about 40 mm in order to increase the size of the wrench wrench.).
As a result, the load on the fan 5 can be reduced, and its performance can be maximized.
[0022]
Further, the intake port 8 can be formed in the casing 7 corresponding to the position where the control device 6 such as the torque sensor is stored in front of the housing position of the impact torque generating device 3.
Thereby, the flow of air in the hydraulic torque wrench main body can be made smooth, and the air cooling effect can be improved.
Further, by separating the position where the fan 5 and the intake port 8 are formed, the flow velocity of the air sucked from the intake port 8 can be made uniform, and it is possible to make it difficult to suck dust from the intake port 8.
[0023]
By the way, in the present embodiment, the rear casing 7 is narrowed down from the housing position of the electric motor 2, and the position of the space 4 formed on the back side of the electric motor 2 is determined based on the sectional area of the casing 7 at the housing position of the electric motor 2. Although the cross-sectional area of the casing 7 is reduced, it is more preferable that the hydraulic torque wrench according to the second embodiment of the present invention be driven by an electric motor having an air-cooling device of the present invention shown in FIGS. As described above, the sectional area of the casing 7 at the accommodation position of the electric motor 2 and the sectional area of the casing 7 at the position of the space 4 formed on the back side of the electric motor 2 are formed to have substantially the same area.
Thus, the air in the hydraulic torque wrench body on the front surface can be uniformly sucked and discharged to the outside through the electric motor 2.
The other configuration of the hydraulic torque wrench of the second embodiment is the same as that of the hydraulic torque wrench of the second embodiment.
[0024]
【Example】
Hereinafter, a more specific embodiment of the hydraulic torque wrench driven by the electric motor having the air cooling device of the present invention and the temperature will be compared with a conventional example without a fan (FIGS. 5 to 6). 1 is shown.
[0025]
[Table 1]

[0026]
From Table 1, it can be seen that by forming a space 4 on the back side of the electric motor 2 and arranging the fan 5 through this space 4, it is possible to prevent the internal temperature of the hydraulic torque wrench 1 from rising. The cross-sectional area of the casing 7 at the accommodation position 2 and the cross-sectional area of the casing 7 at the position of the space 4 formed on the back side of the electric motor 2 are formed to have substantially the same area, thereby further preventing the internal temperature from rising. I confirmed that I can do it.
[0027]
As described above, the air-cooling device of the hydraulic torque wrench driven by the electric motor according to the present invention has been described based on the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment. The configuration can be appropriately changed without departing from the scope.
[0028]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the air cooling device of the hydraulic torque wrench driven by the electric motor of the present invention, the air in the hydraulic torque wrench main body is sucked through the space formed on the back side of the electric motor, and the rear end face of the main body is sucked. The fan inside the hydraulic torque wrench can be uniformly sucked and discharged to the outside by using a fan that exhausts air from the hydraulic torque wrench. The air cooling effect prevents the internal temperature of the hydraulic torque wrench from rising. it can.
As a result, it is possible to prevent the temperature of the hydraulic oil filled in the impact torque generating device from rising, and to solve the problem that the capacity of the hydraulic torque wrench fluctuates and the tightening force of the nut or the like becomes unstable. In addition, it is possible to provide a hydraulic torque wrench driven by an electric motor that can stably operate for a long time continuously.
[0029]
Also, by forming the cross-sectional area of the casing at the accommodation position of the electric motor and the cross-sectional area of the casing at the position of the space formed on the back side of the electric motor to be substantially the same area, the hydraulic pressure on the front surface of the electric motor can be reduced. The air in the main body of the torque wrench can be uniformly sucked and discharged to the outside.
[0030]
Further, by setting the distance between the electric motor and the fan to be equal to or greater than 20 mm, the load on the fan can be reduced and its performance can be maximized.
[0031]
Further, by forming the air intake port in the casing in front of the housing position of the impact torque generating device, it is possible to make the air flow in the hydraulic torque wrench main body smooth and improve the air cooling effect.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of a hydraulic torque wrench driven by an electric motor having an air-cooling device of the present invention, where (a) is a partially cutaway side view and (b) is a rear view. .
FIG. 2 is a sectional view of the same.
3A and 3B show a second embodiment of a hydraulic torque wrench driven by an electric motor having an air cooling device according to the present invention, wherein FIG. 3A is a partially cutaway side view, and FIG. .
FIG. 4 is a sectional view of the same.
5A and 5B show a hydraulic torque wrench driven by a conventional electric motor, wherein FIG. 5A is a side view and FIG. 5B is a rear view.
FIG. 6 is a sectional view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hydraulic torque wrench 2 Electric motor 3 Impact torque generator 4 Space 5 Fan 6 Control device 7 Casing 8 Inlet 9 Exhaust

Claims (4)

In an air cooling mechanism of a hydraulic torque wrench configured to drive a striking torque generating device filled with hydraulic oil by an electric motor, a hydraulic torque wrench main body is provided through a space formed on the back side of the electric motor. An air cooling mechanism for a hydraulic torque wrench driven by an electric motor, wherein a fan for sucking the air and discharging the air from a rear end surface of the main body is provided. 2. The electric motor according to claim 1, wherein a cross-sectional area of the casing at a storage position of the electric motor and a cross-sectional area of the casing at a position of a space formed on the back side of the electric motor are formed to have substantially the same area. Air-cooled mechanism of a driven hydraulic torque wrench. 3. The air cooling mechanism of a hydraulic torque wrench driven by an electric motor according to claim 1, wherein a distance between the electric motor and the fan is set to 20 mm or more. 4. An air cooling mechanism for a hydraulic torque wrench driven by an electric motor according to claim 1, wherein an intake port is formed in a casing in front of a housing position of the impact torque generating device.

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