JP2005344674A - Structure of fan shroud in work vehicle - Google Patents

Structure of fan shroud in work vehicle Download PDF

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Publication number
JP2005344674A
JP2005344674A JP2004167918A JP2004167918A JP2005344674A JP 2005344674 A JP2005344674 A JP 2005344674A JP 2004167918 A JP2004167918 A JP 2004167918A JP 2004167918 A JP2004167918 A JP 2004167918A JP 2005344674 A JP2005344674 A JP 2005344674A
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Prior art keywords
fan
fan shroud
cooling fan
shroud
cooling
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JP2004167918A
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Akemasa Kimura
明正 木村
Hirotaka Yato
博隆 矢藤
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Mitsubishi Agricultural Machinery Co Ltd
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Mitsubishi Agricultural Machinery Co Ltd
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Priority to JP2004167918A priority Critical patent/JP2005344674A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent both the tip of the blade of a cooling fan and the edge part of the ventilation hole of a fan shroud from being damaged even if the tip of the blade and the edge part of the ventilation port are brought into contact with each other due to the error of assembly in a work vehicle such as an agricultural tractor having the cooling fan cooling an engine and the fan shroud covering the cooling fan. <P>SOLUTION: A cushioning member 41 formed of an elastically deformable material with low resilience is peripherally fitted to the edge part of the ventilation hole 33a to relieve an impact caused when the edge part of the ventilation hole 33a formed in the fan shroud 33 is brought into contact with the cooling fan 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、農業用トラクタ等の作業車両において、エンジンを冷却するための冷却ファンを覆うファンシュラウドの構造に関する。   The present invention relates to a structure of a fan shroud that covers a cooling fan for cooling an engine in a work vehicle such as an agricultural tractor.

従来、エンジンを冷却するための冷却ファンを構成するブレードの周囲には、このブレードの先端と一定のチップクリアランスを保つ通風口を備えたファンシュラウドが設けられているが、車体の振動に伴うエンジンの揺動によりブレードの先端とファンシュラウドの通風口の縁部とが接触した場合は、ブレードとファンシュラウドが損傷する虞があることから、当該ファンシュラウドをブレードの半径方向の内側と外側とに2分割すると共に、2分割したファンシュラウドをブレードの半径方向に伸縮可能な複数の弾性体を介して連結した構成のものが知られている。(例えば、特許文献1参照。)。
実開平4−123327号公報(第6−8頁、図1−図3)
Conventionally, a fan shroud having a ventilation opening that maintains a constant tip clearance with the tip of the blade is provided around the blade constituting the cooling fan for cooling the engine. If the blade tip and the edge of the fan shroud vent contact each other due to the swinging of the blade, the blade and the fan shroud may be damaged, so that the fan shroud is placed inside and outside in the radial direction of the blade. There is known a structure in which a fan shroud divided into two parts is connected via a plurality of elastic bodies that can expand and contract in the radial direction of the blade. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 4-123327 (page 6-8, FIGS. 1 to 3)

前記構成により、ブレードの先端とファンシュラウドの通風口縁部、即ちブレードの先端と内側のファンシュラウドとが接触して両者の位置が相対的に変動しても、伸縮可能な複数の弾性体が押縮されて内側のファンシュラウドがブレードの半径方向外側へ変移し、それによって、ブレードの先端と内側のファンシュラウドとの接触による衝撃を緩和して両者の損傷を回避できるようになっている。そして、ブレードの先端と内側のファンシュラウドとの接触状態が終了すると、弾性体の復元力によって内側のファンシュラウドが元の位置に復帰するようになっている。   With the above-described configuration, even if the blade tip and the air shroud edge of the fan shroud, that is, the blade tip and the inner fan shroud come into contact with each other and the positions of the two fluctuate relatively, a plurality of elastic bodies that can expand and contract are obtained. By being compressed, the inner fan shroud shifts radially outward of the blade, thereby reducing the impact caused by contact between the blade tip and the inner fan shroud and avoiding damage to both. When the contact state between the tip of the blade and the inner fan shroud ends, the inner fan shroud returns to the original position by the restoring force of the elastic body.

しかし、上述したファンシュラウドは、構成部品の点数が多いのでコストが高くなると共に、所望の効果が得られる適切な圧縮及び復元作用を兼ね備えた弾性体を見出すことが困難であった。また、農業用トラクタのように、ファンシュラウドをエンジン側部のシャーシーフレームに一体的に取り付ける構成のものでは、その組立誤差によって当該ファンシュラウドと冷却ファンが接触して両者が損傷するといった問題点を有していた。   However, the above-described fan shroud has a large number of component parts, so that the cost is high, and it is difficult to find an elastic body that has an appropriate compression and restoration action to obtain a desired effect. In addition, in the case where the fan shroud is integrally attached to the chassis frame on the engine side, such as an agricultural tractor, the fan shroud and the cooling fan come into contact with each other due to the assembly error, and both are damaged. Had.

本発明は、上記課題を解決することを目的として創案したものであって、エンジンを冷却する冷却ファンと、該冷却ファンを覆うファンシュラウドを備えた作業車両において、ファンシュラウドに形成した通風口の縁部と冷却ファンの接触時の衝撃を緩和すべく、前記通風口の縁部に緩衝部材を周設したことを第1の特徴としている。   The present invention was devised with the object of solving the above-described problems, and in a work vehicle including a cooling fan for cooling an engine and a fan shroud covering the cooling fan, a vent hole formed in the fan shroud is provided. A first feature is that a buffer member is provided around the edge of the ventilation port in order to mitigate the impact at the time of contact between the edge and the cooling fan.

前記緩衝部材が弾性変形可能な低反発性の材料で形成されていることを第2の特徴としている。   A second feature is that the buffer member is formed of a low-repulsive material that can be elastically deformed.

請求項1の発明によれば、ファンシュラウドに形成した通風口の縁部と冷却ファンの接触時の衝撃を緩和するための緩衝部材を、前記通風口の縁部に周設したことによって、農業用トラクタのように、ファンシュラウドをエンジン側部のシャーシーフレームに一体的に取り付ける構成の作業車両では、その組立誤差によって当該ファンシュラウドと冷却ファンの接触が起こったとしても、この緩衝部材によって前記接触時の衝撃が緩和され、しかも冷却ファンは前記通風口の縁部と直接接触することがないので両者に損傷が起こらない。また、ファンシュラウドの通風口と冷却ファンとの間のチップクリアランスを安価な緩衝部材のみで一定に確保することができる。そして、万一緩衝部材に冷却ファンのブレードの先端が著しく接触して緩衝部材が損傷した場合は、当該緩衝部材を交換するだけ済むのでメンテナンス性に優れている。   According to the first aspect of the present invention, the shock absorbing member for reducing the impact at the time of contact between the cooling fan and the edge of the ventilation opening formed in the fan shroud is provided around the edge of the ventilation opening. In a work vehicle in which a fan shroud is integrally attached to a chassis frame on the engine side, such as a tractor for a vehicle, even if the fan shroud and the cooling fan come into contact with each other due to assembly errors, The impact at the time of contact is mitigated, and the cooling fan does not come into direct contact with the edge of the vent hole, so that both are not damaged. In addition, the tip clearance between the fan shroud vent and the cooling fan can be kept constant with only an inexpensive cushioning member. In the unlikely event that the tip of the cooling fan blade comes into contact with the shock absorbing member and the shock absorbing member is damaged, the shock absorbing member only needs to be replaced.

また、請求項2の発明によれば、前記緩衝部材が弾性変形可能な低反発性の材料で形成されているので、冷却ファンが当該緩衝部材に接触しても容易に損傷が起こらない。   According to the invention of claim 2, since the buffer member is made of a low-repulsive material that can be elastically deformed, even if the cooling fan contacts the buffer member, damage is not easily caused.

以下、本発明の実施形態を図面に基づいて説明する。図1に示すように、農業用トラクタ10は、左右一対の前輪11,11及び後輪12,12を有する走行機体13上にエンジン14をボンネット15で覆った状態で搭載すると共に、その後方にハンドル16及び運転席17等からなる操縦部18を設け、更に機体の後部には、耕耘装置等を昇降可能に装着する図示しない作業機取付部を備えている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the agricultural tractor 10 is mounted on a traveling machine body 13 having a pair of left and right front wheels 11 and 11 and rear wheels 12 and 12 in a state where the engine 14 is covered with a bonnet 15 and at the rear thereof. A steering unit 18 including a handle 16 and a driver's seat 17 is provided, and a rear portion of the machine body is provided with a work machine attachment unit (not shown) on which a tillage device and the like are mounted so as to be movable up and down.

そして、前記走行機体13は、エンジン14の側部に取り付けるシャーシーフレーム21と、エンジン14に連結する図示しないクラッチハウジング、及びクラッチハウジングとミッションケースとを一体的に連結する中間伝動ケース等から構成されると共に、クラッチハウジングと中間伝動ケースの上方にはオペレータが足を載せるステップ22を設け、更にステップ22の後部から左右のフェンダー23L,23R(右側のフェンダー23Rは不図示)を後方に向けて連設し、このフェンダー23L,23Rによって後輪12,12の前方及び上方を覆っている。   The traveling machine body 13 includes a chassis frame 21 attached to a side portion of the engine 14, a clutch housing (not shown) connected to the engine 14, an intermediate transmission case that integrally connects the clutch housing and the transmission case, and the like. In addition, a step 22 on which the operator puts his / her foot is provided above the clutch housing and the intermediate transmission case, and the left and right fenders 23L and 23R (the right fender 23R is not shown) are directed rearward from the rear portion of the step 22. The fenders 23L and 23R are continuously provided to cover the front and upper sides of the rear wheels 12 and 12.

また、エンジン14の前方には、ラジエータ25、エアークリーナ26、及びこのエアークリーナ26の下方には図示しないバッテリー等を配設し、更にそれらの前方に目の粗い網を張設した外気取り入れ部を構成するフロントグリル27を設けている。そして、ラジエータ25を固定的に支持するための左右の支持部材28L,28R(右側の支持部材28Rは不図示)をシャーシーフレーム21から立設すると共に、両支持部材28L,28Rに隔壁29を一体的に取り付けている。   In addition, a radiator 25, an air cleaner 26, and a battery (not shown) or the like are disposed below the air cleaner 26 in front of the engine 14, and an open air intake portion in which a coarse mesh is stretched in front of them. A front grille 27 is provided. Then, left and right support members 28L and 28R (right support member 28R not shown) for supporting the radiator 25 in a fixed manner are erected from the chassis frame 21, and a partition wall 29 is provided between the support members 28L and 28R. It is attached integrally.

即ち、前記隔壁29によって、ラジエータ25の前方と該ラジエータ25後方のエンジンルーム31とが区画されると共に、それらの上方を覆うボンネット15により当該ラジエータ25の前方は全体的に閉鎖された空間になっており、ラジエータ25の前方側へはフロントグリル27の外気取り入れ部以外から外気が容易に流入することはない。   That is, the partition wall 29 partitions the front of the radiator 25 and the engine room 31 behind the radiator 25, and the front of the radiator 25 is totally closed by the bonnet 15 covering the upper part thereof. Therefore, outside air does not easily flow into the front side of the radiator 25 from other than the outside air intake portion of the front grill 27.

そして、図2に示すように、ラジエータ25の背面側には、エンジン14からの動力により回転駆動する冷却ファン(ラジエータファン)32を配設すると共に、この冷却ファン32を覆うファンシュラウド33が支持部材28L,28Rと隔壁29に一体的に取り付けてあり、当該冷却ファン32によってフロントグリル27の外気取り入れ部から外気を吸引し、その外気が冷却風としてラジエータ25通過した後、エンジンルーム31内に導入されるようになっている。   As shown in FIG. 2, a cooling fan (radiator fan) 32 that is rotationally driven by power from the engine 14 is disposed on the back side of the radiator 25, and a fan shroud 33 that covers the cooling fan 32 is supported. The members 28L and 28R are integrally attached to the partition wall 29. The cooling fan 32 sucks the outside air from the outside air intake portion of the front grill 27, and the outside air passes through the radiator 25 as cooling air, and then enters the engine room 31. It has been introduced.

更に詳しくは、図3〜図5に示すように、ファンシュラウド33には、冷却ファン32を構成する複数のブレード32aの先端と一定のチップクリアランスCを保つ円形の通風口33aを形成してある。そして、通風口33aの縁部には、安価で弾性変形可能な低反発性の柔軟な材料であるウレタンフォームやゴムスポンジ等からなる帯状の緩衝部材41を、当該通風口33aの縁部から冷却ファン32側にせり出させた状態で両面テープ42を介して周設することによって、前記チップクリアランスCを形成している。   More specifically, as shown in FIGS. 3 to 5, the fan shroud 33 is formed with a circular ventilation port 33 a that maintains the tips of the plurality of blades 32 a constituting the cooling fan 32 and a constant tip clearance C. . A belt-like buffer member 41 made of urethane foam, rubber sponge, or the like, which is an inexpensive and elastically deformable low resilience flexible material, is cooled from the edge of the air vent 33a to the edge of the air vent 33a. The chip clearance C is formed by surrounding the fan 32 with a double-sided tape 42 in a protruding state.

上述した緩衝部材41は、ファンシュラウド33に形成した通風口33aの縁部と冷却ファン32のブレード32aの先端が接触する際の衝撃を緩和すべく設けたものであって、農業用トラクタのように、ファンシュラウド33が、エンジン14側部のシャーシーフレーム21から立設する左右の支持部材28L,28Rを介して一体的に取り付けられる構成の作業車両においては、その組立誤差によって当該ファンシュラウドと冷却ファンの接触が起こったとしても、弾性変形可能な低反発性の柔軟な材料からなる緩衝部材41によって、前記接触時の衝撃が緩和され、しかも冷却ファン32は、前記通風口33aの縁部と直接接触することがないので両者に損傷が起こらない。   The buffer member 41 described above is provided to alleviate the impact when the edge of the air vent 33a formed in the fan shroud 33 and the tip of the blade 32a of the cooling fan 32 come into contact with each other, like an agricultural tractor. In addition, in a work vehicle in which the fan shroud 33 is integrally attached via the left and right support members 28L and 28R erected from the chassis frame 21 on the side of the engine 14, the fan shroud 33 and the fan shroud 33 Even if the cooling fan contacts, the shock at the time of the contact is reduced by the buffer member 41 made of an elastically deformable, low-repulsive flexible material, and the cooling fan 32 has an edge portion of the ventilation port 33a. Because there is no direct contact with both, there is no damage to both.

また、ファンシュラウド33の通風口33aと冷却ファン32との間のチップクリアランスCを安価な緩衝部材41のみで一定に確保することができ、しかも図6〜図8に示す従来の一般的なファンシュラウド63のように、通風口63aの縁部Dを絞り成形する必要がないのでコストの低減が図られる。そして、万一緩衝部材41に冷却ファン32のブレード32aの先端が著しく接触して緩衝部材41が損傷した場合は、当該緩衝部材41を交換するだけ済むのでメンテナンス性に優れている。   Further, the chip clearance C between the air vent 33a of the fan shroud 33 and the cooling fan 32 can be kept constant with only the inexpensive buffer member 41, and the conventional general fan shown in FIGS. Unlike the shroud 63, it is not necessary to draw and mold the edge D of the vent hole 63a, so that the cost can be reduced. In the unlikely event that the tip of the blade 32a of the cooling fan 32 comes into contact with the shock absorbing member 41 and the shock absorbing member 41 is damaged, the shock absorbing member 41 is simply replaced, so that maintenance is excellent.

尚、図9に示すように、前記緩衝部材41をリング状に一体成形すると共に、その外周側に周回溝41aを設け、この周回溝41aをファンシュラウド33の通風口33aの縁部に嵌め込むことによって、当該緩衝部材41を通風口33aの縁部に周設するように構成してもよい。   As shown in FIG. 9, the buffer member 41 is integrally formed in a ring shape, and a circumferential groove 41 a is provided on the outer peripheral side, and the circumferential groove 41 a is fitted into the edge of the vent hole 33 a of the fan shroud 33. Thus, the buffer member 41 may be configured to be provided around the edge of the vent hole 33a.

農業用トラクタの斜視図。The perspective view of the agricultural tractor. エンジンルームの側面図。The side view of an engine room. ファンシュラウドの背面図。The rear view of a fan shroud. 図3におけるA矢視図。FIG. 図3におけるBB断面図。BB sectional drawing in FIG. 従来のファンシュラウドの背面図。The rear view of the conventional fan shroud. 図6におけるA矢視図。A arrow view in FIG. 図6におけるBB断面図。BB sectional drawing in FIG. その他の緩衝部材の実施例を示す図3におけるBB断面図。The BB sectional view in Drawing 3 showing the example of other buffer members.

符号の説明Explanation of symbols

14 エンジン
32 冷却ファン
33 ファンシュラウド
33a 通風口
41 緩衝部材
14 Engine 32 Cooling fan 33 Fan shroud 33a Ventilation port 41 Buffering member

Claims (2)

エンジン(14)を冷却する冷却ファン(32)と、該冷却ファン(32)を覆うファンシュラウド(33)を備えた作業車両において、ファンシュラウド(33)に形成した通風口(33a)の縁部と冷却ファン(32)の接触時の衝撃を緩和すべく、前記通風口(33a)の縁部に緩衝部材(41)を周設したことを特徴とする作業車両におけるファンシュラウドの構造。   In a work vehicle including a cooling fan (32) that cools the engine (14) and a fan shroud (33) that covers the cooling fan (32), an edge portion of an air vent (33a) formed in the fan shroud (33) A structure of a fan shroud in a work vehicle, characterized in that a buffer member (41) is provided around an edge of the ventilation port (33a) in order to mitigate an impact at the time of contact between the cooling fan and the cooling fan (32). 前記緩衝部材(41)が弾性変形可能な低反発性の材料で形成されていることを特徴とする請求項1に記載の作業車両におけるファンシュラウドの構造。   The structure of the fan shroud in the work vehicle according to claim 1, wherein the buffer member (41) is made of a low-repulsive material that can be elastically deformed.
JP2004167918A 2004-06-07 2004-06-07 Structure of fan shroud in work vehicle Pending JP2005344674A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112762019A (en) * 2021-04-07 2021-05-07 北京三快在线科技有限公司 Fan damping mechanism, fan assembly and unmanned aerial vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112762019A (en) * 2021-04-07 2021-05-07 北京三快在线科技有限公司 Fan damping mechanism, fan assembly and unmanned aerial vehicle

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