JPH04194325A - Overheat preventive apparatus for constructing machine - Google Patents

Overheat preventive apparatus for constructing machine

Info

Publication number
JPH04194325A
JPH04194325A JP32113690A JP32113690A JPH04194325A JP H04194325 A JPH04194325 A JP H04194325A JP 32113690 A JP32113690 A JP 32113690A JP 32113690 A JP32113690 A JP 32113690A JP H04194325 A JPH04194325 A JP H04194325A
Authority
JP
Japan
Prior art keywords
internal combustion
combustion engine
engine
temperature
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP32113690A
Other languages
Japanese (ja)
Other versions
JP3202222B2 (en
Inventor
Tomohiko Yasuda
知彦 安田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP32113690A priority Critical patent/JP3202222B2/en
Publication of JPH04194325A publication Critical patent/JPH04194325A/en
Application granted granted Critical
Publication of JP3202222B2 publication Critical patent/JP3202222B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/02Controlling of coolant flow the coolant being cooling-air
    • F01P7/04Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/048Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

PURPOSE:To prevent overheating of an internal combustion engine during a heavy load operation period by detecting the cooling-water temperature or engine-oil temperature and, when the heated state of the engine corresponds to a value equal to or larger than a predetermined value, rotating an exhaust fan to cause exhaustion of high-temperature air in an engine room. CONSTITUTION:When, during a heavy load operation of an oil pressure pump 24, the cooling-water temperature (oil temperature) of an internal combustion engine 21 rises and a corresponding signal is inputted into a control device 2 from a sensor 4 and the level of this signal is equal to or higher than a level set beforehand, an exhaust fan 1 is rotated with a given number of revolutions to cause an increased- temperature cooling air in an engine room 20 to be compulsively exhausted to the outside and also to cause the internal pressure to be liberated. Consequently, the amount of the cooling air passing through a radiator 23 is increased to improve the radiating characteristics, whereby the internal combustion engine 21 is prevented from being overheated. This can prevent the overheating of the internal combustion engine without increasing the volume of the radiator, the size and number-of-revolutions of a cooling fan, the suction/exhaust area of an engine cover, etc., and without decreasing the absorption horse power of the oil pressure pump.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、油圧ショベル、クレーンなどの建設機械に
係り、特にエンジンルーム内に搭載された内燃機関のオ
ーバーヒートを防止する装置の改良に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to construction machines such as hydraulic excavators and cranes, and particularly relates to an improvement of a device for preventing overheating of an internal combustion engine mounted in an engine room.

[従来の技v#] 例えば油圧ショベルのような建設機械において、エンジ
ンルーム内は第4図に示すようになっており、21はエ
ンジンルーム20内に搭載された内燃機関、22は内燃
機関21によって駆動される冷却ファン、23は冷却フ
ァン22の前方位置に設けられたラジェータ、24は内
燃機関21によって駆動される油圧ポンプ、25はラジ
ェータ23の前方位置におけるエンジンルーム20の上
方壁部に設けられた吸気口、26は油圧ポンプ24の上
方位置におけるエンジンルーム2oの壁部に設けられた
排気口である。油圧ポンプ24がディーゼルエンジンの
ような内燃機関21によって駆動されているものでは、
内燃機関21の冷却水および内燃機関21により駆動さ
れる油圧ポンプ24用作動油の冷却を行うラジェータ2
3の容量、内燃機関21により駆動される吸い込み型冷
却ファン22のサイズ及び回転数、エンジンカバー20
の吸気面積及び排気面積、油圧ポンプ24の吸収馬力な
どは、一般的負荷の作業を連続して行っても内燃機関2
1がオーバーヒートしないように設定されている。
[Conventional Technique v#] For example, in a construction machine such as a hydraulic excavator, the inside of the engine room is as shown in FIG. 23 is a radiator provided in front of the cooling fan 22; 24 is a hydraulic pump driven by the internal combustion engine 21; 25 is provided on the upper wall of the engine room 20 in front of the radiator 23; The intake port 26 is an exhaust port provided in the wall of the engine room 2o above the hydraulic pump 24. In the case where the hydraulic pump 24 is driven by an internal combustion engine 21 such as a diesel engine,
Radiator 2 that cools cooling water for the internal combustion engine 21 and hydraulic oil for the hydraulic pump 24 driven by the internal combustion engine 21
3, the size and rotation speed of the suction type cooling fan 22 driven by the internal combustion engine 21, and the engine cover 20.
The intake area and exhaust area of the internal combustion engine 2, the absorption horsepower of the hydraulic pump 24, etc.
1 is set so that it does not overheat.

[発明が解決しようとする課題] ところが、短時間に大作業量を行う重負荷の状態で継続
して使用′されると、内燃機関はオーバーヒートの状態
になってしまう。また、重負荷の状態で使用されてもオ
ーバーヒートを起こさないようにするためには、ラジェ
ータの容量を大きくし、冷却ファンのサイズを大きくし
、かつエンジンカバーの吸排気面積を大きくする必要が
あり、これによりコストが大幅にアップしてしまう、ま
た、エンジンカバーの吸排気面積を大きくすると、内燃
機関の騒音が外部に漏れるため、騒音が大きくなってし
まう。
[Problems to be Solved by the Invention] However, if the internal combustion engine is continuously used under a heavy load that performs a large amount of work in a short period of time, the internal combustion engine will overheat. Additionally, in order to prevent overheating even when used under heavy loads, it is necessary to increase the capacity of the radiator, the size of the cooling fan, and the intake and exhaust area of the engine cover. This significantly increases the cost. Also, if the intake and exhaust area of the engine cover is increased, the noise from the internal combustion engine leaks to the outside, resulting in increased noise.

この発明は上記の事情に鑑み成されたもので、その目的
とするところは、ラジェータの容量、冷却ファンのサイ
ズおよび回転数、エンジンカバーの吸排気面積などを大
きくせずに、また、油圧ポンプの吸収馬力を下げずに、
重負荷作業時の内燃機関のオーバーヒートを防止できる
建設機械のオーバーヒート防止装置を提供することにあ
る。
This invention was made in view of the above circumstances, and its purpose is to eliminate the need to increase the capacity of the radiator, the size and rotation speed of the cooling fan, the intake/exhaust area of the engine cover, etc. without reducing the absorption horsepower of
An object of the present invention is to provide an overheat prevention device for construction machinery that can prevent overheating of an internal combustion engine during heavy load work.

[課題を解決するための手段] この発明は上記の目的を達成するために、内燃機関と、
その内燃機関により駆動される吸い込み型冷却ファンと
、その冷却ファンにより送風されて内燃機関の冷却水及
び内燃機関により駆動される油圧ポンプ用作動油の冷却
を行うラジェータとをエンジンルーム内に搭載した建設
機械において、内燃機関の冷却水温度あるいはエンジン
オイル温度を検出し、その温度に対応する信号を出力す
る温度センサと、エンジンルーム内に吸い込まれた空気
を排出するための排aファンと、前記温度センサからの
信号を入力し、前記排出ファンの回転数を制御する制御
装置を備え、その制御装置はエンジンの熱状態が予め定
められた値以上である時に、このことを前記温度センサ
からの信号により判定し、前記排気ファンを内燃機関の
オーバーヒートを防止する任意の回転数に制御させる構
成にしたことを特徴としている。
[Means for Solving the Problems] In order to achieve the above object, the present invention includes an internal combustion engine,
A suction type cooling fan driven by the internal combustion engine, and a radiator blown by the cooling fan to cool the cooling water of the internal combustion engine and the hydraulic oil for the hydraulic pump driven by the internal combustion engine are installed in the engine room. In a construction machine, a temperature sensor detects a cooling water temperature or an engine oil temperature of an internal combustion engine and outputs a signal corresponding to the temperature; an exhaust fan for discharging air sucked into an engine room; The controller includes a control device that inputs a signal from the temperature sensor and controls the rotation speed of the exhaust fan, and the control device receives the signal from the temperature sensor when the thermal state of the engine is equal to or higher than a predetermined value. The present invention is characterized in that the exhaust fan is controlled to an arbitrary rotation speed that prevents overheating of the internal combustion engine based on the determination based on a signal.

[作用] 上記の構成により、重負荷作業時でエンジンの熱状態が
予め定められた値以上である場合には、排気ファンを任
意の回転数で回転させて、エンジンルーム内の高温空気
を強制的に外部に排出させると共に、これに基づき冷却
ファンによりラジェータを通過する空気量を増加させる
ことで、内燃機関のオーバーヒートが防止される。
[Function] With the above configuration, when the thermal state of the engine exceeds a predetermined value during heavy load work, the exhaust fan is rotated at a desired speed to force high-temperature air in the engine room. This prevents the internal combustion engine from overheating by discharging the air to the outside and increasing the amount of air passing through the radiator using a cooling fan.

[実施例] 以下この発明の一実施例を第1図ないし第3図に基づい
て説明する0図において、第4図と同様なものには同じ
符号を付している。エンジンルーム20内には、内燃機
関21、内燃機関21によって駆動される冷却ファン2
2、冷却ファン22の前方位置に設けられたラジェータ
23および。
[Embodiment] In Fig. 0, in which an embodiment of the present invention will be described below based on Figs. 1 to 3, the same reference numerals are given to the same parts as in Fig. 4. Inside the engine room 20, an internal combustion engine 21 and a cooling fan 2 driven by the internal combustion engine 21 are provided.
2. A radiator 23 provided in a position in front of the cooling fan 22.

内燃機関21によって駆動される油圧ポンプ24が搭載
されており、そして、エンジンルーム2゜の上方壁部に
おけるラジェータ23の前方位置には吸気口25が設け
られており、エンジンルーム20の壁部における油圧ポ
ンプ24の上方位置には排気口26が設けられており、
エンジンルーム20における排気口26の位置には排気
ファン1が取り付けられている。排気ファン1を駆動す
るための電気回路は、第2図に示すように構成されてお
り、2は排気ファン1の回転数を制御する制御装置で、
該制御装置は電源3に接続されていると共に、内燃機関
21に取り付けられて、内燃機関21の冷却水温度(ま
たは、内燃機関21のオイル温度)を検出し、それに応
じた信号を出力するセンサ(温度センサ)4に接続され
ている。
A hydraulic pump 24 driven by an internal combustion engine 21 is mounted, and an intake port 25 is provided at a position in front of the radiator 23 on the upper wall of the engine room 20. An exhaust port 26 is provided above the hydraulic pump 24.
An exhaust fan 1 is attached to the exhaust port 26 in the engine room 20. The electric circuit for driving the exhaust fan 1 is configured as shown in FIG. 2, and 2 is a control device that controls the rotation speed of the exhaust fan 1.
The control device is connected to the power source 3 and includes a sensor attached to the internal combustion engine 21 to detect the cooling water temperature of the internal combustion engine 21 (or the oil temperature of the internal combustion engine 21) and output a signal in accordance with the detected temperature. (temperature sensor) connected to 4.

上記の構成において、油圧ポンプ24による一般的負荷
の作業のときには、内燃機関21により駆動される冷却
ファン22によって冷却空気が吸気口25からラジェー
タ23を通してエンジンル−ム20内に吸い込まれた後
、エンジンルーム20内では第1図に矢印で示すように
内燃機関21および油圧ポンプ24の周囲を流れてそれ
らを冷却し、その後に排気口26から外部に排出する。
In the above configuration, when the hydraulic pump 24 is operating under a general load, the cooling fan 22 driven by the internal combustion engine 21 sucks cooling air from the intake port 25 through the radiator 23 into the engine room 20. Inside the engine room 20, as shown by arrows in FIG. 1, the air flows around the internal combustion engine 21 and the hydraulic pump 24 to cool them, and is then discharged to the outside from the exhaust port 26.

上記排気口26の関口面積は、エンジンルーム20内の
騒音が外部に漏れるのを防止するために大きさが適宜の
ものに制限されている。このため、油圧ポンプ24によ
る重負荷作業時には、エンジンルーム20内に高温とな
った冷却空気がたまり、内圧が発生する。このとき、内
燃機関21の冷却水温度(または、内燃機関21のオイ
ル温度)が上昇し、それに応じた信号がセンサ(温度セ
ンサ)4によって制御装置2に入力されると、制御装置
2では入力された値が予め定められた値以上である場合
には、排気ファン1を任意の回転数で回転させて、エン
ジンルーム20内の高温となった冷却空気を強制的に外
部に排出すると共に、内圧を解放させる。これにより、
ラジェータ23を通過する冷却空気の量が増加して放熱
性が向上し、内燃機関21のオーバーヒートが防止され
る。
The exit area of the exhaust port 26 is limited to an appropriate size in order to prevent the noise inside the engine room 20 from leaking to the outside. Therefore, when the hydraulic pump 24 performs heavy-load work, high-temperature cooling air accumulates in the engine room 20, generating internal pressure. At this time, when the cooling water temperature of the internal combustion engine 21 (or the oil temperature of the internal combustion engine 21) rises and a corresponding signal is input to the control device 2 by the sensor (temperature sensor) 4, the control device 2 receives the input signal. If the determined value is equal to or higher than a predetermined value, the exhaust fan 1 is rotated at an arbitrary rotation speed to forcibly exhaust the high temperature cooling air in the engine room 20 to the outside, Release internal pressure. This results in
The amount of cooling air passing through the radiator 23 increases, improving heat dissipation and preventing the internal combustion engine 21 from overheating.

上記の制御装置i2による排気ファン1の制御方法とし
ては、内燃機関21の温度上昇に比例して排気ファン1
の回転数を増加させる方法、また増加量も段階的に増加
させる方法など種々考えられるが、第4図はその中の一
例を示したもので、センサ4として温度スイッチ5が用
いられており、また制御装[2としてリレー6が用いら
れている。
As a method of controlling the exhaust fan 1 by the control device i2 described above, the exhaust fan 1
There are various methods that can be considered, such as increasing the rotational speed and increasing the amount of rotation in stages. FIG. 4 shows one example of this, in which a temperature switch 5 is used as the sensor 4. Further, a relay 6 is used as the control device [2.

内燃機関21の冷却水温度(または、内燃機関21のオ
イル温度)が上昇し、その値が予め定めた値を越えると
温度スイッチ5がONとなり、リレー6を励磁させるた
め、排気ファン1が電源3に接続されて、排気ファン1
が予め設定された回転数で回転する。
When the cooling water temperature of the internal combustion engine 21 (or the oil temperature of the internal combustion engine 21) rises and exceeds a predetermined value, the temperature switch 5 is turned on and the exhaust fan 1 is turned on to excite the relay 6. 3 connected to the exhaust fan 1
rotates at a preset rotation speed.

なお、上記の実施例では、排気ファンを電気駆動の例で
示したが、この発明は油圧駆動または空圧駆動の場合で
あっても同様に実現できることは勿論である。
In the above embodiment, the exhaust fan is electrically driven, but it goes without saying that the present invention can be implemented in the same manner even if the exhaust fan is hydraulically or pneumatically driven.

[発明の効果コ 以上説明したこの発明の建設機械のオーバーヒート防止
装置によれば、ラジェータの容量、冷却ファンのサイズ
および回転数、エンジンカバーの吸排気面積などを大き
くせずに、また、油圧ポンプの吸収馬力を下げずに、重
負荷作業時の内燃機関のオーバーヒートを防止すること
ができる。また、内燃機関の熱状態に応じて適宜ラジェ
ータの放熱量を制御できるので、内燃機関の寿命を延ば
し、故障を防止することができる。さらにまた。
[Effects of the Invention] According to the overheat prevention device for construction machinery of the present invention explained above, the hydraulic pump It is possible to prevent the internal combustion engine from overheating during heavy load work without reducing the absorption horsepower of the engine. Further, since the heat radiation amount of the radiator can be controlled as appropriate depending on the thermal state of the internal combustion engine, the life of the internal combustion engine can be extended and failures can be prevented. Yet again.

エンジンカバーの排気口面積を拡大せずに冷却空気量を
増加させることができるので5同一の冷却空気量を吸排
気する場合、内燃機関の騒音の外部への漏れ量が少なく
なり、低騒音かも図ることができる。
The amount of cooling air can be increased without expanding the exhaust port area of the engine cover. 5 When the same amount of cooling air is taken in and exhausted, the amount of internal combustion engine noise leaking to the outside is reduced, resulting in lower noise. can be achieved.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の建設機械のオーバーヒート防止装置
の一実施例を示す説明用断面略図、第2図は第1図に示
した排気ファンの記動回路を示す電気回路図、第3図は
第1図に示した制御装置の一例を示す電気回路図、第4
図は従来の建設機械のオーバーヒート防止装置を示す説
明用断面略図である。 1・・・・・・排気ファン、2・・・・・制御装置、3
・・・・・電源、4・・・・・・センサ、20・・・・
・・エンジンルーム、21・・・・・内燃機関、22・
・・・・冷却ファン、23・・・・・ラジェータ、24
・・・・・・油圧ポンプ、25・・・・・・吸気口。 26・・・・・・排気口。 第1図 232I 第2図 gs4図
FIG. 1 is an explanatory cross-sectional schematic diagram showing an embodiment of the overheat prevention device for construction machinery according to the present invention, FIG. 2 is an electric circuit diagram showing the recording circuit of the exhaust fan shown in FIG. 1, and FIG. Electrical circuit diagram showing an example of the control device shown in FIG.
The figure is a schematic cross-sectional view for explaining a conventional overheat prevention device for construction machinery. 1...Exhaust fan, 2...Control device, 3
...Power supply, 4...Sensor, 20...
・・Engine room, 21・・Internal combustion engine, 22・
...Cooling fan, 23...Radiator, 24
...Hydraulic pump, 25...Intake port. 26...exhaust port. Fig. 1 232I Fig. 2 gs4

Claims (1)

【特許請求の範囲】[Claims] (1)内燃機関と、その内燃機関により駆動される吸い
込み型冷却ファンと、その冷却ファンにより送風されて
内燃機関の冷却水及び内燃機関により駆動される油圧ポ
ンプ用作動油の冷却を行うラジエータとをエンジンルー
ム内に搭載した建設機械において、内燃機関の冷却水温
度あるいはエンジンオイル温度を検出し、その温度に対
応する信号を出力する温度センサと、エンジンルーム内
に吸い込まれた空気を排出するための排出ファンと、前
記温度センサからの信号を入力し、前記排出ファンの回
転数を制御する制御装置を備え、その制御装置はエンジ
ンの熱状態が予め定められた値以上である時に、このこ
とを前記温度センサからの信号により判定し、前記排気
ファンを内燃機関のオーバーヒートを防止する任意の回
転数に制御させる構成にしたことを特徴とする建設機械
のオーバーヒート防止装置。
(1) An internal combustion engine, a suction-type cooling fan driven by the internal combustion engine, and a radiator that is blown by the cooling fan to cool cooling water for the internal combustion engine and hydraulic oil for a hydraulic pump driven by the internal combustion engine. In construction machinery installed in the engine room, there is a temperature sensor that detects the cooling water temperature or engine oil temperature of the internal combustion engine and outputs a signal corresponding to that temperature, and a temperature sensor that discharges the air sucked into the engine room. and a control device that inputs a signal from the temperature sensor and controls the rotation speed of the exhaust fan, and the control device controls the temperature when the thermal state of the engine is above a predetermined value. An overheat prevention device for construction machinery, characterized in that the exhaust fan is determined by a signal from the temperature sensor, and the exhaust fan is controlled to an arbitrary rotation speed that prevents overheating of the internal combustion engine.
JP32113690A 1990-11-27 1990-11-27 Overheating prevention equipment for construction machinery Expired - Fee Related JP3202222B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32113690A JP3202222B2 (en) 1990-11-27 1990-11-27 Overheating prevention equipment for construction machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32113690A JP3202222B2 (en) 1990-11-27 1990-11-27 Overheating prevention equipment for construction machinery

Publications (2)

Publication Number Publication Date
JPH04194325A true JPH04194325A (en) 1992-07-14
JP3202222B2 JP3202222B2 (en) 2001-08-27

Family

ID=18129208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32113690A Expired - Fee Related JP3202222B2 (en) 1990-11-27 1990-11-27 Overheating prevention equipment for construction machinery

Country Status (1)

Country Link
JP (1) JP3202222B2 (en)

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KR101705906B1 (en) * 2011-01-24 2017-02-10 두산인프라코어 주식회사 an Engine Room Cooling Apparatus for a Construction Heavy Equipment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11311127A (en) * 1998-02-25 1999-11-09 Komatsu Ltd Sound arrester of power generating unit

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JP3202222B2 (en) 2001-08-27

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