JP2023150093A

JP2023150093A - work vehicle

Info

Publication number: JP2023150093A
Application number: JP2022059001A
Authority: JP
Inventors: 昇錦織; Noboru Nishigori; 隆行藤原; Takayuki Fujiwara; 敦紀森; Atsunori Mori
Original assignee: Mitsubishi Mahindra Agricultural Machinery Co Ltd
Current assignee: Mitsubishi Mahindra Agricultural Machinery Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-10-16

Abstract

To provide a work vehicle in which a vibration isolating member is interposed between a bracket provided on left and right side plates of a chassis and a bracket provided on a vertical engine, an arrangement form of the vibration isolating member is reviewed when supporting the engine on the left and right side plates for anti-vibration, whereby a vibration isolating member is provided together with the engine at an inside the left and right side plates to effectively support the engine for anti-vibration and excessive vibration of the engine also can be controlled at low cost.SOLUTION: In a work vehicle, respective vibration isolating members 64, 65, which are provided together with an engine at an inside left and right side plates 3 and support the front left and right sides and the rear left and right sides of the engine, are provided in an inclination form where a compression direction thereof is inclined in a horizontal direction and in a horizontal form with the compression direction being a vertical direction. The work vehicle comprises a mount stopper which regulates vibration of the engine, which is supported via those vibration isolating members, in a cross direction, the vibration level being equal to or greater than a specified level.SELECTED DRAWING: Figure 5

Description

本発明は、乗用型の芝刈機又は草刈機、農業用トラクタ、或いは田植機等の作業車両に関し、詳しくは、走行装置や作業装置等を駆動する動力源となるエンジンを作業車両の骨格となるシャーシ（機体フレーム）に搭載する際のマウント装置（エンジンマウント）に関する。 The present invention relates to a work vehicle such as a riding lawn mower or grass cutter, an agricultural tractor, or a rice transplanter, and more specifically, the present invention relates to a work vehicle such as a riding lawn mower or grass cutter, an agricultural tractor, or a rice transplanter. It relates to a mounting device (engine mount) when mounted on a chassis (aircraft frame).

農業用のトラクタ等の作業車両は、シャーシに動力源となるエンジンやトランスミッション等を設けて作業走行を行う。なお、この場合、シャーシはサイドメンバーを構成する前後方向に延びる左右一対の縦枠をクロスメンバーを構成する複数の横枠で連結して枠組みし、曲げおよびねじりに対する強度と剛性を確保する。 2. Description of the Related Art Work vehicles such as agricultural tractors are equipped with an engine, transmission, etc. that serves as a power source in their chassis, and are used for work driving. In this case, the chassis is constructed by connecting a pair of left and right vertical frames that form the side members and extend in the front-rear direction with a plurality of horizontal frames that form the cross members, thereby ensuring strength and rigidity against bending and torsion.

また、シャーシはその前部寄りにエンジンやその補器類を搭載すると共に、エンジンの下方となるシャーシにフロントアクスルケースを左右揺動自在に取付け、このフロントアクスルケースに設ける前車軸は左右の前輪を駆動する。さらに、シャーシの後部寄りにトランスミッションケースを取付け、このトランスミッションケースの左右にはリアアクスルケースを設け、リアアクスルケースに軸支する後車軸は左右の後輪を駆動する。 In addition, the chassis is equipped with the engine and its auxiliary equipment near the front, and a front axle case is attached to the chassis below the engine so that it can swing left and right. to drive. Furthermore, a transmission case is attached to the rear of the chassis, and rear axle cases are provided on the left and right sides of the transmission case, and the rear axle, which is pivotally supported by the rear axle case, drives the left and right rear wheels.

そして、このように構成する作業車両のエンジンは、そのクランクシャフトが車体前後方向を向く縦置きにレイアウトすることが多く、このようにエンジンを縦置きにすると、後方に設けるトランスミッションにエンジンからドライブシャフト等を介して真っすぐ後ろに動力を伝達し易くなって、動力伝達系をシンプルに構成することができる（例えば、特許文献１参照）。 The engine of a work vehicle configured in this way is often laid out vertically with its crankshaft facing the longitudinal direction of the vehicle body. It becomes easy to transmit power straight to the rear via the vehicle, etc., and the power transmission system can be configured simply (see, for example, Patent Document 1).

ところで、これらの比較的小型の作業車両の場合、車体を出来るだけコンパクトに纏めて軽量化を行い安価にユーザーに提供できるようにすることが望ましい。そこで、前述のシャーシにしてもその幅や長さを出来るだけ短くして重量の軽減を図り車体のコンパクト化に貢献する必要がある。 By the way, in the case of these relatively small-sized work vehicles, it is desirable to make the vehicle body as compact and lightweight as possible so that it can be provided to users at low cost. Therefore, even with the aforementioned chassis, it is necessary to reduce the width and length as much as possible to reduce the weight and contribute to making the vehicle body more compact.

しかし、シャーシの後部寄りに設けるトランスミッションケースは、その左右の縦枠にトランスミッションケースを左右から挟み込むように取付け、トランスミッションケース自体をシャーシのクロスメンバーとして用いることが多い。そのため、シャーシの左右の縦枠を加工工数を削減するために直線状の平行する側板で形成すると、シャーシの幅は全長に亘って専ら左右の側板を取付けるトランスミッションケースの幅に基づいて決定されるといった制約がある。 However, the transmission case installed near the rear of the chassis is often attached to the left and right vertical frames so as to sandwich the transmission case from the left and right, and the transmission case itself is used as a cross member of the chassis. Therefore, if the left and right vertical frames of the chassis are formed of straight parallel side plates in order to reduce the number of processing steps, the width of the chassis will be determined over the entire length based solely on the width of the transmission case to which the left and right side plates will be attached. There are such restrictions.

特開２００７－５５２８０号公報Japanese Patent Application Publication No. 2007-55280

前述のように、作業車両はエンジンやトランスミッション等をシャーシに設けており、この場合、特許文献１に開示されていることでも明らかなように、エンジンはシャーシに防振ゴム等の防振部材を介して搭載する。そして、このようにエンジンを防振支持して搭載することによってエンジンの振動がシャーシを介して車体全体に伝わるのを低減して作業者の乗り心地等を改善する。 As mentioned above, a work vehicle is equipped with an engine, a transmission, etc. on the chassis, and in this case, as disclosed in Patent Document 1, the engine is equipped with a vibration-isolating member such as anti-vibration rubber on the chassis. Loaded via. By mounting the engine with anti-vibration support in this manner, transmission of engine vibration to the entire vehicle body via the chassis is reduced, thereby improving ride comfort for the operator.

なお、エンジンの回転運動によるエンジン自体の揺れ（振れ）は、エンジンを横置きにすると前後方向に発生し易いが、縦置きにするとエンジン自体の揺れは左右方向に発生し易い。そのため、前述のようにシャーシにエンジンを防振部材を介して縦置きする際には、エンジンの前部左右寄りと後部左右寄りを支持する夫々の防振部材を、その圧縮方向を左右方向に傾けて設けることによって、防振部材がエンジンの揺れを受け止め易くしてエンジンの周辺に設ける機器との当接を防止する。 It should be noted that shaking (shudder) of the engine itself due to rotational motion of the engine tends to occur in the longitudinal direction when the engine is placed horizontally, but when the engine is placed vertically, the shaking of the engine itself tends to occur in the left-right direction. Therefore, when installing the engine vertically on the chassis via vibration isolating members as described above, the vibration isolating members that support the front left and right sides and the rear left and right sides of the engine are compressed in the left and right direction. By providing the vibration isolating member at an angle, the vibration isolating member can easily absorb the shaking of the engine and prevent it from coming into contact with equipment installed around the engine.

しかし、上述のように防振部材をその圧縮方向を左右方向に傾けて設けると、例えば防振部材をその圧縮方向を上下方向として平置きする場合に比べて防振部材の配置スペースが増大する。一方、車体のコンパクト化を図るためにシャーシの幅をトランスミッションケースの幅と同等となすと、シャーシの左右のサイドメンバー間にエンジンを収めることはできても、傾斜する防振部材をエンジンの側方に設けて、これを左右のサイドメンバー間に収めることが困難となる。 However, when the vibration isolating member is provided with its compression direction tilted in the left-right direction as described above, the space for placing the vibration isolating member increases compared to, for example, when the vibration isolating member is placed horizontally with its compression direction being in the vertical direction. . On the other hand, if the width of the chassis is made equal to the width of the transmission case in order to make the car body more compact, the engine can be accommodated between the left and right side members of the chassis, but the sloping vibration isolating member is placed on the side of the engine. This makes it difficult to fit it between the left and right side members.

そこで、特許文献１では、傾斜させて設ける防振部材をシャーシの左右のサイドメンバーの上方に設けて防振部材の配置スペースを左右外方側に拡げて確保するが、これによると防振部材のエンジンに対する取付高さにもよるが、その実施形態に示されるように防振部材をエンジンの下部寄りに設けるとエンジンの配置高さが相対的に高くなり、それによって作業車両の重心が高くなって機体が転倒し易くなるといった問題や、後方に設ける運転席からの前方視界が悪化するといった問題がある。 Therefore, in Patent Document 1, a vibration isolating member provided at an angle is provided above the left and right side members of the chassis to expand the space for arranging the vibration isolating member to the left and right outward sides, but according to this, the vibration isolating member Although it depends on the installation height of the vehicle relative to the engine, if the vibration isolating member is provided closer to the bottom of the engine as shown in the embodiment, the installation height of the engine becomes relatively high, which raises the center of gravity of the work vehicle. There are problems such as the aircraft becoming more prone to tipping over and the forward visibility from the rear driver's seat becoming worse.

また、係る問題を解決するためにエンジンを搭載する箇所のシャーシ幅を部分的に拡げて、防振部材の配置スペースを確保することが考えられるが、シャーシの左右のサイドメンバー間の幅を部分的に拡げるとシャーシの重量、加工工数、強度上の何れの面でも不利となってコストアップを免れない。ところで、エンジンの揺れはエンジン自体の回転運動に伴う起振力による他、例えば車両を急発進・急停止させたり、傾斜地での作業や路面の凹凸等の外力によっても発生する。 In addition, in order to solve this problem, it is possible to partially widen the chassis width at the location where the engine is mounted to secure space for placing the vibration isolating member. If the chassis is enlarged, it will be disadvantageous in terms of chassis weight, processing time, and strength, and costs will inevitably increase. Incidentally, engine shaking is caused not only by the vibrational force accompanying the rotational movement of the engine itself, but also by external forces such as sudden starting and stopping of the vehicle, work on slopes, unevenness of the road surface, and the like.

そこで、このエンジンの前後方向の振れや左右方向に対する過度の振れを防止するために特許文献１では、エンジン側ステー及びフレーム側ステーに挟持される振動吸収部材を備え、また、エンジン側ステーに規制ピンを、そして、フレーム側ステーには規制ピンが挿通されるスリットを設けて、エンジンのローリング方向の揺動に加えて前後方向の揺動も規制することが記載されている。 Therefore, in order to prevent the engine from shaking in the longitudinal direction or excessive vibration in the lateral direction, Patent Document 1 provides a vibration absorbing member that is held between the engine side stay and the frame side stay, and also has a vibration absorbing member that is clamped on the engine side stay. It is described that a pin is provided in the frame side stay, and a slit through which a regulating pin is inserted is provided to restrict not only the rocking motion of the engine in the rolling direction but also the rocking motion in the front-rear direction.

従って、係る振れ防止構造を採用することによってエンジンの過度の振れを規制することができる。しかし、このものではエンジン側やフレーム側のステーに規制ピンやスリット等を設ける必要があり、ステー自体の製作費がアップするという問題があって俄かに採用し難く、改善の余地が残されている。 Therefore, by employing such a vibration prevention structure, excessive vibration of the engine can be restricted. However, this method requires the provision of regulating pins, slits, etc. on the stays on the engine side and the frame side, which increases the manufacturing cost of the stay itself, making it difficult to adopt, and there is still room for improvement. ing.

そこで、本発明は、前述のような問題点に鑑み、シャーシの左右側板に設けるブラケットと、縦置きエンジンに設けるブラケットの間に防振部材を介装し、エンジンを左右の側板に防振支持する際に、この防振部材の配置形態を見直すことによって、左右の側板の内側にエンジンとともに防振部材を設けてエンジンを効果的に防振支持すると共に、エンジンの過度の振れも安価に規制することができる作業車両を提供する。 Therefore, in view of the above-mentioned problems, the present invention provides vibration-proof support for the engine on the left and right side plates by interposing a vibration isolating member between the brackets provided on the left and right side plates of the chassis and the brackets provided on the vertically mounted engine. By reconsidering the arrangement of the vibration isolating members, it is possible to install the vibration isolating members along with the engine inside the left and right side panels to effectively support the engine with vibration isolation, and also to control excessive vibration of the engine at a low cost. We provide work vehicles that can

本発明の作業車両は、前述の課題を解決するために第１に、シャーシのサイドメンバーを構成する左右の側板と、この左右の側板の内側に夫々設ける前後のシャーシ側ブラケットと、縦置きエンジンの前部と後部の左右寄りに夫々設けるエンジン側ブラケットの間に防振部材を介装して、エンジンを左右の側板に防振支持する際に、前記エンジンの前部左右寄りと後部左右寄りを支持する夫々の防振部材を、その圧縮方向を左右方向に傾けて設ける傾斜形態と、その圧縮方向を上下方向とする平置形態で設けると共に、前記防振部材を介して支持するエンジンの所定以上の前後方向の振れを規制するマウントストッパを備えることを特徴する。 In order to solve the above-mentioned problems, the work vehicle of the present invention firstly includes left and right side plates that constitute side members of the chassis, front and rear chassis side brackets provided inside the left and right side plates, respectively, and a vertical engine. A vibration isolating member is interposed between the engine side brackets provided on the front and rear left and right sides of the engine, and when the engine is vibration-proof supported on the left and right side plates, the front left and right sides and the rear left and right sides of the engine are Each of the vibration isolating members supporting the engine is provided in an inclined form with its compression direction tilted in the left-right direction, and in a horizontal form with its compression direction being in the vertical direction. It is characterized in that it includes a mount stopper that restricts vibration in the longitudinal direction beyond a predetermined value.

また、本発明の作業車両は第２に、前記縦置きエンジンは、そのシリンダブロックの前部側にギヤケースや冷却ファンを設け、また、このシリンダブロックの後部側にリヤプレートやフライホイールを設けると共に、前記エンジンの前部左右寄りに設けるエンジン側ブラケットをシリンダブロックの前部左右下端寄りに取付けて、前記傾斜形態で設ける防振部材をシリンダブロックの前方側に設け、さらに、エンジンの後部左右寄りに設けるエンジン側ブラケットをシリンダブロックの後部左右下端寄りに取付けて、前記平置形態で設ける防振部材をリヤプレートやフライホイールを避けたシリンダブロックの外方側に設けることを特徴する。 Second, in the work vehicle of the present invention, the vertical engine is provided with a gear case and a cooling fan on the front side of the cylinder block, and a rear plate and a flywheel on the rear side of the cylinder block. , an engine-side bracket provided on the left and right sides of the front of the engine is attached to the front left and right lower ends of the cylinder block, a vibration isolating member provided in the inclined form is provided on the front side of the cylinder block; The engine side bracket provided on the cylinder block is attached near the rear left and right lower ends of the cylinder block, and the vibration isolating member provided in the horizontal configuration is provided on the outer side of the cylinder block avoiding the rear plate and the flywheel.

さらに、本発明の作業車両は第３に、前記マウントストッパは、前記平置形態で設ける左右の防振部材に夫々一体に組込んで、エンジンの前後方向の振れを規制することを特徴とする。 Furthermore, thirdly, the work vehicle of the present invention is characterized in that the mount stopper is integrated into the left and right vibration isolating members provided in the horizontally placed configuration, respectively, to restrict vibration of the engine in the longitudinal direction. .

そして、本発明の作業車両は第４に、前記平置形態で設ける左右の防振部材、或いはこの防振部材を取付けるエンジン側ブラケットの外端部を左右の側板の内側に近接させて設け、この近接する防振部材、或いはエンジン側ブラケットの外端部が左右の側板に当接した際に、エンジンのその以上の左右方向の振れを規制することを特徴とする。 Fourthly, in the work vehicle of the present invention, the left and right vibration isolating members provided in the horizontal configuration, or the outer ends of the engine side brackets to which the vibration isolating members are attached, are provided close to the insides of the left and right side plates, The present invention is characterized in that when the adjacent vibration isolating members or the outer ends of the engine side brackets come into contact with the left and right side plates, further vibration of the engine in the left and right direction is restricted.

本発明の作業車両によれば、シャーシのサイドメンバーを構成する左右の側板と、この左右の側板の内側に夫々設ける前後のシャーシ側ブラケットと、縦置きエンジンの前部と後部の左右寄りに夫々設けるエンジン側ブラケットの間に防振部材を介装して、エンジンを左右の側板に防振支持する際に、前記エンジンの前部左右寄りと後部左右寄りを支持する夫々の防振部材を、その圧縮方向を左右方向に傾けて設ける傾斜形態と、その圧縮方向を上下方向とする平置形態で設けると共に、前記防振部材を介して支持するエンジンの所定以上の前後方向の振れを規制するマウントストッパを備えるから、左右の側板の内側にエンジンの下部とともに防振部材を設けてエンジンを効果的に防振支持することができると共に、マウントストッパを備えてエンジンの前後方向の振れを規制し、エンジンの周辺に設ける機器との当接を確実に防止することができる。 According to the work vehicle of the present invention, the left and right side plates constituting the side members of the chassis, the front and rear chassis side brackets provided inside the left and right side plates, respectively, and the front and rear chassis side brackets provided on the left and right sides of the front and rear parts of the vertical engine, respectively. When a vibration isolating member is interposed between the provided engine side brackets and the engine is vibrationally supported on the left and right side plates, the vibration isolating members that support the front left and right sides and the rear left and right sides of the engine, In addition to providing an inclined form in which the compression direction is inclined in the left-right direction and a flat form in which the compression direction is in the vertical direction, the engine supported through the vibration isolating member is restrained from shaking in the longitudinal direction beyond a predetermined value. Since the mount stopper is provided, a vibration isolating member can be provided inside the left and right side plates along with the lower part of the engine to effectively support the engine in vibration isolation, and the mount stopper is also provided to restrict vibration of the engine in the longitudinal direction. , it is possible to reliably prevent contact with equipment provided around the engine.

より詳細には、全ての防振部材をその圧縮方向を左右方向に傾けて設けると、防振部材の配置スペースの増大によって、シャーシの左右の側板の間にエンジンの下部と共に防振部材を設けることができず、傾斜する防振部材を側板の上方に設けるといった対策を取らざるを得ない。しかし、エンジンの前部左右寄りと後部左右寄りを支持する夫々の防振部材を、その圧縮方向を左右方向に傾けて設ける傾斜形態と、その圧縮方向を上下方向とする平置形態に分けると、例えば傾斜形態で設ける防振部材をエンジンの下部寄りに存在する前方側又は後方側の空きスペースを利用して当該箇所に防振部材を設けることができる。 More specifically, if all the vibration isolating members are provided with their compression directions tilted to the left and right, the space for arranging the vibration isolating members will increase, making it possible to provide the vibration isolating members between the left and right side plates of the chassis together with the lower part of the engine. Therefore, it is necessary to take measures such as installing an inclined vibration isolating member above the side plate. However, if the vibration isolating members that support the front left and right sides of the engine and the rear left and right sides of the engine are divided into two types: an inclined type where the compression direction is tilted in the left and right direction, and a horizontal type where the compression direction is in the vertical direction. For example, the vibration isolating member can be provided in an inclined manner by utilizing an empty space on the front side or the rear side that exists near the bottom of the engine.

また、前方側及び後方側に空きスペースが無く傾斜形態の防振部材では設けることができない防振部材であっても、配置スペースの少ない平置形態に変えればこの防振部材をエンジンの下部寄りの外方側に設けることができる。そして、このように防振部材の配置形態を２つに分けると、エンジンの前部左右寄り又は後部左右寄りに設ける傾斜形態の防振部材はエンジンの支持と共にエンジンの左右方向の振れを受け止めることができ、また、他方の平置形態の防振部材はエンジンの左右方向の振れを防止することはあまり期待できないものの、比較的寸法の小さいサイズの防振部材を用いてもエンジンの重量を確実に支持することができる。 In addition, even if there is no free space on the front and rear sides and it is not possible to install a vibration isolating member in an inclined form, it is possible to move this vibration isolating member closer to the bottom of the engine by changing to a horizontally placed form with less space. It can be provided on the outer side of the Dividing the arrangement of the vibration isolating members into two types as described above, the inclined vibration isolating members installed on the left and right sides of the front of the engine or the left and right sides of the rear support the engine and also absorb the vibrations of the engine in the left and right direction. Although the vibration isolating member of the other horizontal type cannot be expected to prevent the engine from shaking in the horizontal direction, it is possible to ensure the weight of the engine even if a vibration isolating member with relatively small dimensions is used. can be supported.

従って、エンジンマウントにおける防振、制振、支持機能を２つの配置形態の防振部材に振り分けて備えさせ、エンジンを効果的に防振支持することができる。なお、この場合、エンジンの前後方向の過度の振れは傾斜形態や平置形態の防振部材では抑え難い。そこで、係る前後方向の振れに対してはマウントストッパを備えることによって、エンジンの周辺に設ける機器との当接を確実に防止することができる。 Therefore, the functions of vibration isolation, damping, and support in the engine mount are divided between two types of vibration isolating members, and the engine can be effectively vibration-isolated and supported. In this case, it is difficult to suppress excessive vibration of the engine in the front-rear direction with an inclined vibration damping member or a flat vibration damping member. Therefore, by providing a mount stopper against such vibration in the longitudinal direction, it is possible to reliably prevent contact with equipment provided around the engine.

また、本発明の作業車両によれば、前記縦置きエンジンは、そのシリンダブロックの前部側にギヤケースや冷却ファンを設け、また、このシリンダブロックの後部側にリヤプレートやフライホイールを設けると共に、前記エンジンの前部左右寄りに設けるエンジン側ブラケットをシリンダブロックの前部左右下端寄りに取付けて、前記傾斜形態で設ける防振部材をシリンダブロックの前方側に設け、さらに、エンジンの後部左右寄りに設けるエンジン側ブラケットをシリンダブロックの後部左右下端寄りに取付けて、前記平置形態で設ける防振部材をリヤプレートやフライホイールを避けたシリンダブロックの外方側に設けると、前述のように左右の側板の内側にエンジンの下部とともに防振部材を設けてエンジンを効果的に防振支持することができる。 Further, according to the work vehicle of the present invention, the vertical engine is provided with a gear case and a cooling fan on the front side of the cylinder block, and a rear plate and a flywheel on the rear side of the cylinder block. An engine side bracket provided on the left and right sides of the front of the engine is attached to the front left and right lower ends of the cylinder block, and the vibration isolating member provided in the inclined form is provided on the front side of the cylinder block, and further, an engine side bracket is installed on the front side of the cylinder block near the left and right lower ends of the engine. If the provided engine side bracket is attached near the rear left and right lower ends of the cylinder block, and the vibration isolating member provided in the horizontal configuration is provided on the outer side of the cylinder block avoiding the rear plate and flywheel, the left and right vibrations will be reduced as described above. By providing a vibration isolating member along with the lower part of the engine inside the side plate, the engine can be effectively supported in vibration isolation.

より詳細には、縦置きエンジンは、そのシリンダブロックの前部側にギヤケースや冷却ファンを設けるが、これ等のギヤケースや冷却ファンの下方の左右側には若干の空きスペースを生ずる。そこで、シリンダブロックの前方側となるこの空きスペースに左右の防振部材を傾斜させて設ける。なお、この場合、左右の側板の内側に左右の前シャーシ側ブラケットを設ける共に、左右のエンジン側ブラケットをシリンダブロックの前部左右下端寄りに取付けて、両ブラケットの間に左右の防振部材を介装する。 More specifically, a vertically mounted engine is provided with a gear case and a cooling fan on the front side of its cylinder block, but there is some empty space on the left and right sides below these gear cases and cooling fans. Therefore, the left and right vibration isolating members are provided at an angle in this empty space on the front side of the cylinder block. In this case, the left and right front chassis side brackets are installed inside the left and right side plates, the left and right engine side brackets are installed near the lower left and right ends of the front part of the cylinder block, and the left and right vibration isolators are installed between both brackets. intervene.

一方、エンジンのシリンダブロックの後部側に設けるリヤプレートやフライホイールは大径となしており元々幅狭とする左右の側板との間には僅かな隙間しかなく、ここに左右の防振部材を設けることができない。しかし、これ等の前方となるエンジンのシリンダブロックと左右の側板との間には平置形態の防振部材を設けることができるスペースがある。そこで、左右の側板の内側に左右の後シャーシ側ブラケットを設ける共に、左右のエンジン側ブラケットをシリンダブロックの後部左右下端寄りに取付けて、両ブラケットの間に平置形態で左右の防振部材を介装する。 On the other hand, the rear plate and flywheel installed at the rear of the engine's cylinder block have a large diameter, and there is only a small gap between them and the left and right side plates, which are originally narrow. cannot be set up. However, there is a space between the front engine cylinder block and the left and right side plates in which a horizontal vibration isolating member can be provided. Therefore, the left and right rear chassis side brackets were installed inside the left and right side plates, and the left and right engine side brackets were installed near the rear left and right lower ends of the cylinder block, and the left and right vibration isolators were placed horizontally between the two brackets. intervene.

なお、エンジンのシリンダブロックの後部側に設けるリヤプレートやフライホイールの後方側であれば、左右の防振部材を傾斜形態であっても設けることができる空きスペースがある。しかし、係る箇所に防振部材を設けるためにはエンジン側ブラケットをシリンダブロックやリヤプレートからフライホイールを迂回させて設ける必要があって、この場合、エンジン側ブラケットを後方に延長すべく強度アップを図り、それ自体の重量の増大が懸念されるから、係るマウント構造は一概に採用し難い。 Note that there is an empty space in which left and right vibration isolating members can be provided even if they are in an inclined form, provided that the rear plate or flywheel is provided on the rear side of the cylinder block of the engine. However, in order to install a vibration isolating member in such a location, it is necessary to install the engine side bracket by bypassing the flywheel from the cylinder block or rear plate. However, since there is a concern that the weight of the mounting structure itself will increase, it is difficult to universally adopt such a mounting structure.

さらに、本発明の作業車両によれば、前記マウントストッパは、前記平置形態で設ける左右の防振部材に夫々一体に組込んで、エンジンの前後方向の振れを規制するから、エンジン側ブラケットやシャーシ側ブラケットにマウントストッパとして機能させる部材や加工を施す必要がなく、簡単に又安価にエンジンの前後方向の振れを規制することができる。より詳細には、平置形態で設ける左右の防振部材はストッパ付きの角型の防振ゴムを用い、この防振ゴムのボルトを備える上下の取付金具の両端部は上方と下方に湾曲させ、各々の両端部が所定の隙間を隔てて重なるように対向させて設ける。 Furthermore, according to the work vehicle of the present invention, the mount stopper is integrated into the left and right vibration isolating members provided in the horizontally placed configuration, respectively, to restrict the vibration of the engine in the longitudinal direction. It is not necessary to provide a member or process to the chassis side bracket to function as a mount stopper, and the vibration of the engine in the longitudinal direction can be easily and inexpensively controlled. More specifically, the left and right vibration isolating members installed in a horizontal configuration are made of rectangular vibration isolating rubber with stoppers, and both ends of the upper and lower mounting brackets equipped with bolts of this vibration isolating rubber are curved upward and downward. , are provided facing each other so that both ends thereof overlap with each other with a predetermined gap in between.

そして、この防振ゴムの上下取付金具の両端部が前後方向に位置するようにエンジン側ブラケットとシャーシ側ブラケットに取付け、エンジンが前後方向に過度に振れて上下取付金具の対向する両端部が緩衝突起を介して当接すると、それ以上のエンジンの振れが規制される。従って、平置形態で設ける左右の防振部材自体を用いてエンジンの前後方向の振れを確実に規制することができる。 Then, attach the anti-vibration rubber to the engine side bracket and the chassis side bracket so that both ends of the upper and lower mounting brackets are located in the front-rear direction, so that if the engine swings excessively in the front-rear direction, the opposite ends of the upper and lower mounting brackets will provide a buffer. When the protrusions make contact, further vibration of the engine is restricted. Therefore, vibration of the engine in the longitudinal direction can be reliably restricted by using the left and right vibration isolating members themselves, which are provided in a horizontally placed configuration.

また、本発明の作業車両によれば、前記平置形態で設ける左右の防振部材、或いはこの防振部材を取付けるエンジン側ブラケットの外端部を左右の側板の内側に近接させて設け、この近接する防振部材、或いはエンジン側ブラケットの外端部が左右の側板に当接した際に、エンジンのその以上の左右方向の振れを規制するから、エンジンの周辺に設ける機器との当接を確実に防止することができる。 Further, according to the work vehicle of the present invention, the left and right vibration isolating members provided in the horizontally placed configuration, or the outer ends of the engine side brackets to which these vibration isolating members are attached, are provided close to the inside of the left and right side plates, and this When the adjacent vibration isolating member or the outer end of the engine side bracket comes into contact with the left and right side plates, it restricts further vibration in the left and right direction of the engine, so it is important to avoid contact with equipment installed around the engine. This can be reliably prevented.

そして、この場合、エンジンの左右方向の振れの規制は新たに規制部材を設ける必要がなく、エンジンを防振支持する左右の側板と、防振部材例えば、エンジン側ブラケットに対する防振部材の取付金具やエンジン側ブラケットの外端部をストッパの当接部としてそのまま利用するだけであるから、極めて簡素にマウントストッパを構成してコストアップを生ずること無くエンジンの振れを規制することができる。 In this case, there is no need to newly install a regulating member to regulate the horizontal vibration of the engine, and the left and right side plates that support the engine in vibration isolation, and the vibration isolation member, for example, the mounting bracket of the vibration isolation member to the engine side bracket, are used. Since the outer end of the mount stopper and the outer end of the engine-side bracket are simply used as the abutting part of the stopper, the mount stopper can be configured extremely simply and the vibration of the engine can be controlled without increasing costs.

なお、傾斜形態で設ける左右の防振部材側のエンジンの左右方向の振れはマウントストッパを用いて規制していないが、この側は元々左右の防振部材を傾斜形態で設けることによってエンジンの左右方向の振れを防振部材自体で抑制するものであるから、エンジンの左右方向の振れの規制を積極的に行う必要はない。しかし、万が一のために例えば、エンジン側ブラケットに左右側板に向かう規制部を設けて、この規制部の側板との当接によってエンジンのその以上の左右方向の振れを規制するようにしてもよい。 Note that the left and right vibration of the engine on the side of the left and right vibration isolating members provided in an inclined form is not controlled using a mount stopper; Since the directional vibration is suppressed by the vibration isolating member itself, there is no need to actively restrict the horizontal vibration of the engine. However, just in case, for example, a regulating part facing the left and right side plates may be provided on the engine side bracket, and further vibration of the engine in the left and right direction may be regulated by contact of this regulating part with the side plates.

本発明を適用するトラクタの側面図である。FIG. 1 is a side view of a tractor to which the present invention is applied. エンジンを搭載した車体前部寄りの斜視図である。FIG. 2 is a perspective view of the front of the vehicle body in which the engine is mounted. バッテリやカバー等を取外した状態の車体前部寄りの斜視図である。FIG. 2 is a perspective view of the front of the vehicle body with the battery, cover, etc. removed. エンジンの搭載状態を示す底面図である。FIG. 3 is a bottom view showing the mounted state of the engine. シャーシにエンジンを搭載した状態を示す底面図である。FIG. 3 is a bottom view showing a state in which an engine is mounted on the chassis. シャーシにエンジンやトランミッションを搭載する状態を示す斜視図である。FIG. 3 is a perspective view showing a state in which an engine and a transmission are mounted on the chassis. エンジンマウント構造を示す斜視図である。FIG. 3 is a perspective view showing an engine mount structure. 傾斜形態で設ける防振部材の取付状態を示す正面図である。FIG. 3 is a front view showing a state in which a vibration isolating member provided in an inclined manner is attached. 平置形態で設ける防振部材の取付状態を示す背面図である。FIG. 6 is a rear view showing a state in which the vibration isolating member is installed in a horizontally placed configuration. エンジンマウント構造を示す平面図である。FIG. 3 is a plan view showing an engine mount structure. 左エンジンマウント構造を示し、（ａ）は側面図、（ｂ）は平面図、（ｃ）は正面図、（ｄ）は背面図である。The left engine mount structure is shown, with (a) being a side view, (b) being a plan view, (c) being a front view, and (d) being a rear view.

本発明の実施形態を図面に基づいて説明する。図１及び図６に示すように作業車両としての農業用のトラクタ１は、サイドメンバーを構成する前後方向に延びる長尺な左右の縦枠とクロスメンバーを構成する複数の横枠とを結合して枠組みするシャーシ２を備える。そして、この場合、シャーシ２の縦枠は鋼板等で形成する所定の厚さｔと幅と長さを備える左右の側板３をベースに構成し、この左右の側板３はその板面を互いに対向させて平行に設け、横枠となる前面板４やピボットフレーム５等によって所定のシャーシ幅（間隔）Ｗを備える。 Embodiments of the present invention will be described based on the drawings. As shown in FIGS. 1 and 6, an agricultural tractor 1 as a working vehicle combines long left and right vertical frames that extend in the front and back direction that constitute side members and a plurality of horizontal frames that constitute cross members. A chassis 2 is provided. In this case, the vertical frame of the chassis 2 is constructed based on left and right side plates 3 made of steel plate or the like and having a predetermined thickness t, width, and length, and the left and right side plates 3 have their plate surfaces facing each other. A predetermined chassis width (interval) W is provided by the front plate 4, pivot frame 5, etc. which serve as a horizontal frame.

また、左右の側板３の前部寄りには水冷４サイクル３気筒ディーゼルエンジンで構成するエンジン６を後述するように防振支持して搭載すると共に、左右の側板３の後部寄りにはクロスメンバーとしても機能するトランスミッションケース７を、その外側面を左右の側板３によって左右から挟み込むようにボルトで連結し、全体としてトラクタ１の車体を構成する。そして、この車体の前部寄り設けるピボットフレーム５には図４に示すようにフロントアクスルケース８を左右揺動自在に取付け、また、フロントアクスルケース８の左右端にはファイナルケースを設け、係るファイナルケースに軸支する前車軸に左右の前輪９を取付ける。 In addition, an engine 6 consisting of a water-cooled 4-cycle 3-cylinder diesel engine is mounted on the front side of the left and right side plates 3 with anti-vibration support as will be described later, and a cross member is mounted on the rear side of the left and right side plates 3. A transmission case 7 which also functions as a transmission case 7 is connected with bolts so that its outer surface is sandwiched between right and left side plates 3 from the left and right, and the vehicle body of the tractor 1 is constituted as a whole. As shown in FIG. 4, a front axle case 8 is attached to the pivot frame 5 provided near the front of the vehicle body so as to be able to swing left and right, and final cases are provided at the left and right ends of the front axle case 8. The left and right front wheels 9 are attached to the front axle that is pivotally supported on the case.

さらに、車体の後部寄りに設けるトランスミッションケース７の左右下部寄りにリアアクスルケース１０を取付け、このリアアクスルケース１０に軸支する後車軸１１に左右の後輪１２を取付ける。そして、トランスミッションケース７の前部寄りに取付ける静油圧式無段変速装置（ＨＳＴ）１３は、エンジン６の後部側に設ける出力軸からドライブシャフト１４とカップリング１５を介して駆動し、また、トランスミッションケース７内に設ける歯車式の副変速装置は主変速装置を構成する静油圧式無段変速装置１３が変速した動力を更に多段に変速する。 Further, a rear axle case 10 is attached to the left and right lower portions of a transmission case 7 provided near the rear of the vehicle body, and left and right rear wheels 12 are attached to a rear axle 11 pivotally supported by the rear axle case 10. A hydrostatic continuously variable transmission (HST) 13 installed near the front of the transmission case 7 is driven from an output shaft provided at the rear side of the engine 6 via a drive shaft 14 and a coupling 15. A gear-type sub-transmission device provided in the case 7 further changes the power shifted by the hydrostatic continuously variable transmission device 13 constituting the main transmission device into multiple stages.

そして、このように変速する走行系の動力は、トランスミッションケース７内に設ける後輪差動歯車装置に伝達され、この後輪差動歯車装置からリアアクスルケース１０に軸支する後車軸１１を介して左右の後輪１２を駆動する。また、走行系の動力はトランスミッションケース７の前部に設ける前輪動力取出軸１６からユニバーサルジョイント１７とドライブシャフト１８を介してフロントアクスルケース８内に設ける前輪差動歯車装置に伝達され、この前輪差動歯車装置からファイナルケースに軸支する前車軸を介して左右の前輪９を駆動する。 The power of the driving system that changes gears in this way is transmitted to the rear differential gear device provided in the transmission case 7, and from this rear differential gear device via the rear axle 11 pivotally supported on the rear axle case 10. to drive the left and right rear wheels 12. In addition, power for the driving system is transmitted from a front wheel power take-off shaft 16 provided at the front of the transmission case 7 via a universal joint 17 and a drive shaft 18 to a front wheel differential gear device provided within the front axle case 8. The left and right front wheels 9 are driven from a dynamic gear device via a front axle that is pivotally supported on the final case.

一方、静油圧式無段変速装置１３の入力軸１３ａに伝達されたエンジン６の動力は、トランスミッションケース７内に設けるＰＴＯクラッチと減速歯車装置を介してトランスミッションケース７の後部に軸支するリアＰＴＯ軸やトランスミッションケース７の中程下部に軸支するミッドＰＴＯ軸に伝達し、車体の後部に備えるトップリンク１９と左右のロワリンク２０からなる三点リンク機構を介して連結するロータリ耕耘装置や、車体の腹下に設けるモーア等の作業装置を駆動する。 On the other hand, the power of the engine 6 transmitted to the input shaft 13a of the hydrostatic continuously variable transmission 13 is transferred to the rear PTO, which is pivotally supported at the rear of the transmission case 7, via a PTO clutch and a reduction gear provided in the transmission case 7. The transmission is transmitted to the mid-PTO shaft that is pivotally supported at the mid-lower part of the shaft and transmission case 7, and is connected to the rotary tilling device and the vehicle body through a three-point link mechanism consisting of a top link 19 and left and right lower links 20 provided at the rear of the vehicle body. Drives a working device such as a mower installed under the belly of the machine.

さらに、前述のエンジン６は図２乃至図６、図８、及び図９に示すように、その出力軸となるクランクシャフト２１を車体前後方向を向く縦置きとしてシャーシ２に搭載し、そのエンジン本体を構成するシリンダブロック２２やシリンダヘッド２３の前部側にタイミングギヤケース（ギヤケース）２４、ウォーターポンプ２５、クーリングファン（冷却ファン）２６、ゼネレータ２７等を設け、また、シリンダブロック２２の後部側にスタータモータアッシ２８を取付けるリヤプレート２９やフライホイール３０を設け、このリヤプレート２９の後方側のフライホイール３０等は樹脂製のカバー３１で覆い、シリンダブロック２２の下方にはオイルパン３２を設ける。 Further, as shown in FIGS. 2 to 6, 8, and 9, the engine 6 is mounted on the chassis 2 with the crankshaft 21 serving as its output shaft facing in the front-rear direction of the vehicle body, and mounted on the chassis 2. A timing gear case (gear case) 24, water pump 25, cooling fan 26, generator 27, etc. are provided on the front side of the cylinder block 22 and cylinder head 23 that make up the cylinder block 22, and a starter is provided on the rear side of the cylinder block 22. A rear plate 29 to which a motor assembly 28 is attached and a flywheel 30 are provided, the flywheel 30 and the like on the rear side of the rear plate 29 are covered with a cover 31 made of resin, and an oil pan 32 is provided below the cylinder block 22.

また、シリンダヘッド２３のインレットマニホールドとエキゾーストマニホールドに連結するエアクリーナ３３とマフラ３４をエンジン６の上方の左右に振り分けて配置し、さらに、エンジン６前方のシャーシ２上にラジエータブラケット３５と電装ブラケット３６を立設する底板３７を設け、これ等のブラケット３５、３６にラジエータ３８とリレー等の電装品３９を取付けて設ける。また、底板３７の前方寄り中央に矩形状の穴３７ａを設け、この穴３７ａにバッテリ４０を落とし込んで設ける。 In addition, an air cleaner 33 and a muffler 34 connected to the inlet manifold and exhaust manifold of the cylinder head 23 are arranged on the left and right sides above the engine 6, and a radiator bracket 35 and an electrical equipment bracket 36 are installed on the chassis 2 in front of the engine 6. A standing bottom plate 37 is provided, and a radiator 38 and electrical components 39 such as relays are attached to these brackets 35 and 36. Further, a rectangular hole 37a is provided at the center of the bottom plate 37 near the front, and the battery 40 is inserted into this hole 37a.

そして、エンジン６後方のシャーシ２に門型のコラムフレーム４１を立設し、このコラムフレーム４１には上部にステアリングホイール４２を、また下方にパワーステアリングユニット４３を備えるステアリングコラム４４を始め、メータパネルユニット４５やエンジンコントロールレバー等を取付け、これらをパネルカバー４６とリヤパネルカバー４７で覆う。また、コラムフレーム４１の上部にヒンジ４８を設け、このヒンジ４８にエンジン６やエンジン６の補器類を覆うボンネット４９をその前部側が開閉自在に取付ける。 A gate-shaped column frame 41 is installed upright on the chassis 2 behind the engine 6, and the column frame 41 includes a steering column 44 with a steering wheel 42 on the top, a power steering unit 43 on the bottom, and a meter panel. A unit 45, an engine control lever, etc. are attached, and these are covered with a panel cover 46 and a rear panel cover 47. Further, a hinge 48 is provided at the upper part of the column frame 41, and a bonnet 49 that covers the engine 6 and auxiliary equipment of the engine 6 is attached to the hinge 48 so that the front side of the bonnet 49 can be opened and closed.

さらに、コラムフレーム４１の後方側にはエンジン６から静油圧式無段変速装置１３やトランスミッションケース７からフロントアクスルケース８に動力を伝達するドライブシャフト１４、１８等の上方をカバー５０で覆うと共に、そのカバー５０の左右となる側板３に外方側に張出す前後のステー３ａ、３ｂを固着し、この前後のステー３ａ、３ｂに亘って左右のステップ５１を取付けて設ける。なお、側板３に基部を軸支するブレーキペダル５２は左ステップ５１の前部寄りの開口を通してステップ上に臨ませて設け、静油圧式無段変速装置１３を変速操作する前進ペダルと後進ペダルは右ステップ５１の前部寄りに設ける。 Further, on the rear side of the column frame 41, a cover 50 covers the drive shafts 14, 18, etc. that transmit power from the engine 6 to the hydrostatic continuously variable transmission 13, the transmission case 7 to the front axle case 8, etc. Front and rear stays 3a and 3b projecting outward are fixed to the left and right side plates 3 of the cover 50, and left and right steps 51 are attached and provided across the front and rear stays 3a and 3b. The brake pedal 52, whose base is pivotally supported on the side plate 3, is provided so as to face the step through an opening near the front of the left step 51, and the forward and reverse pedals that operate the hydrostatic continuously variable transmission 13 are provided. It is provided near the front of the right step 51.

また、トランスミッションケース７の上部に取付けてリフトアーム５３を軸支する油圧ケース５４の上方にシートブラケット５５を介して運転席５６を取付け、操縦部をエンジン６後方の車体後半部に設ける。さらに、左右の側板３の後端部に門型の脚柱５７を取付け、この脚柱５７の上部左右寄りに左右の下部支柱５８ａを取付け、また、左右の下部支柱５８ａの上部に逆Ｕ字状のロールバー５８ｂを可倒自在に取付けて、運転席５６に座って運転操作する作業者のための安全フレーム５８を構成する。 Further, a driver's seat 56 is attached via a seat bracket 55 above a hydraulic case 54 that is attached to the upper part of the transmission case 7 and pivotally supports a lift arm 53, and a control section is provided in the rear half of the vehicle body behind the engine 6. Further, a gate-shaped pedestal 57 is attached to the rear ends of the left and right side plates 3, and left and right lower columns 58a are attached to the upper left and right sides of the pedestal 57, and an inverted U-shape is attached to the upper part of the left and right lower columns 58a. A safety frame 58 for a worker sitting in the driver's seat 56 and operating the vehicle is constructed by attaching a roll bar 58b in a foldable manner.

そして、運転席５６の下方側から後輪１２の上方側を覆う左右のフェンダ５９にかけて設けるカバー６０には、その開口を通してトランスミッションケース７内に設ける副変速装置を変速操作する走行副変速レバー６１や作業装置を昇降させる油圧昇降レバー、或いはＰＴＯクラッチスイッチ６２等を設け、さらに、運転席５６の後方にはトラクタ１に装着する作業装置の油圧機器を作動させるための複数の外部油圧取出コネクタ６３を設ける。 A cover 60 provided from the lower side of the driver's seat 56 to the left and right fenders 59 covering the upper side of the rear wheels 12 includes a traveling sub-shift lever 61 for operating the sub-transmission device provided in the transmission case 7 through the opening thereof. A hydraulic lifting lever or a PTO clutch switch 62 for raising and lowering the working equipment is provided, and furthermore, a plurality of external hydraulic pressure take-out connectors 63 are provided behind the driver's seat 56 for operating the hydraulic equipment of the working equipment attached to the tractor 1. establish.

以上、トラクタ１の概要について説明したが、次に左右の側板３の前部寄りにエンジン６を防振支持して搭載するエンジンマウント装置について説明すると、先ず、前述のようにシャーシ２のサイドメンバーを構成する左右の側板３は、その後部寄りにトランスミッションケース７を左右から挟み込んでボルトで取付けて設け、この場合、トランスミッションケース７はシャーシ２の強度を高めるクロスメンバーとして機能する。 The outline of the tractor 1 has been explained above.Next, we will explain about the engine mount device which supports and mounts the engine 6 near the front of the left and right side plates 3 in a vibration-proof manner. The left and right side plates 3 constituting the chassis 3 are provided near the rear thereof, sandwiching the transmission case 7 from the left and right sides and attaching it with bolts. In this case, the transmission case 7 functions as a cross member that increases the strength of the chassis 2.

そして、この場合、左右の側板３にトランスミッションケース７を直接的に取付けた場合、左右の側板３の間の幅（内幅）はトランスミッションケース７の当該箇所における幅となる。また、係る幅を備える左右の側板３にエンジン６を防振支持して搭載する場合に、左右の側板３の間の幅が不足して左右の側板３の間の幅を拡げるとすると、左右の側板３とトランスミッションケース７の間に隙間を生じて、これを防止するために余分なスペーサ等を両者の間に介在させる必要が生じると共に、前面板４等の他のクロスメンバーの幅もそれに合わせて拡げることになってシャーシ２が全体的に大型化する。 In this case, when the transmission case 7 is directly attached to the left and right side plates 3, the width (inner width) between the left and right side plates 3 becomes the width of the transmission case 7 at the relevant location. In addition, when mounting the engine 6 with vibration-proof support on the left and right side plates 3 having such a width, if the width between the left and right side plates 3 is insufficient and the width between the left and right side plates 3 is expanded, A gap is created between the side plate 3 and the transmission case 7, and in order to prevent this, it becomes necessary to insert an extra spacer or the like between the two, and the width of other cross members such as the front plate 4 is also adjusted accordingly. As a result, the chassis 2 becomes larger as a whole.

なお、左右の側板３の間の幅を前後方向に一律ではなく部分的に変更することも考えられるが、その場合に例えば、左右の側板３の幅を拡げたい箇所で一旦切断し、この切断した側板３の角度を変えて次々と溶着しながら製作したり、左右の側板３の幅を拡げたい箇所で折り曲げながら製作すると、側板３の重量が角度変化や曲げによって増すと共に、その加工工数が必要となって多大な費用が発生する。さらに、接合部や曲げ部に応力が集中して強度不足となり易く、係る部位に補強部材等を別に設ける必要が生じたりする。 It is also possible to partially change the width between the left and right side plates 3 in the front-rear direction, but in that case, for example, first cut the left and right side plates 3 at the point where you want to widen the width, and then If the left and right side plates 3 are manufactured by changing the angle and welding them one after another, or by bending the left and right side plates 3 at the point where the width is desired to be expanded, the weight of the side plates 3 will increase due to angle changes and bending, and the number of processing steps will increase. This becomes necessary and incurs significant costs. Furthermore, stress tends to be concentrated at joints and bent parts, resulting in insufficient strength, and it may be necessary to separately provide reinforcing members or the like at these parts.

そこで、係る事態を避けるためにシャーシ２の幅、この場合、左右の側板３の間の幅は専らトランスミッションケース７の幅に基づいて決定し、最終的に左右の側板３はこの幅のまま前後方向に平行する直線状になして、シャーシ２の軽量化とコンパクト化を図る。従って、防振支持して搭載するエンジン６は、この制約された幅を備える左右の側板３の前部寄りに設ける必要がある。 Therefore, in order to avoid such a situation, the width of the chassis 2, in this case the width between the left and right side plates 3, is determined exclusively based on the width of the transmission case 7, and finally the left and right side plates 3 are left with this width in the front and back. By forming the chassis 2 in a straight line parallel to the direction, the chassis 2 is made lighter and more compact. Therefore, the engine 6 mounted with anti-vibration support needs to be provided closer to the front of the left and right side plates 3 having the restricted width.

また、前述のようにシャーシ２に縦置きするエンジン６は、その回転運動によるエンジン自体の揺れ（振れ）が左右方向に発生し易く、特にエンジン始動時等の低回転時にはその加振力によってエンジン６が大きく左右に振れるという問題がある。また、トラクタ１はその作業を効率的に行うためにエンジン６の回転数を例えば、定格回転数に至る推奨される作業回転数に合わせて作業を行うことが多く、この場合はエンジン６が自ら大きく振動することはないが、この際にもエンジン６の振動がシャーシ２を介して車体全体に伝わるのを防止して作業者の乗り心地を改善する必要がある。 In addition, as mentioned above, the engine 6 installed vertically in the chassis 2 is likely to cause shaking (shudder) of the engine itself in the left and right direction due to its rotational motion, and especially at low rotation speeds such as when starting the engine, the excitation force causes the engine to shake. There is a problem with the 6 swinging from side to side. In addition, in order to perform the work efficiently, the tractor 1 often performs work by adjusting the rotational speed of the engine 6 to a recommended working rotational speed that reaches the rated rotational speed, and in this case, the engine 6 automatically Although large vibrations do not occur, it is necessary to prevent the vibrations of the engine 6 from being transmitted to the entire vehicle body via the chassis 2 in order to improve the riding comfort for the operator.

さらに、トラクタ１は圃場の枕時での旋回のために前後進を繰り返しながら走行を行うことが多く、その場合の急発進や急停止によってエンジン６は車体の前後方向に慣性に基づいて振れることになる。また、傾斜地走行で例えば、その等高線に沿って作業を行う場合にはエンジン６の傾斜によって右又は左に振れた状態となり、或いは圃場の凹凸によってエンジン６が車体と共に右又左、或いは前又は後に傾くことが往々にして発生し、このような外力によるエンジン６の振れにも対応しなければならない。 Furthermore, the tractor 1 often travels while repeatedly going back and forth to turn during peak periods in the field, and in such cases, the engine 6 may swing in the longitudinal direction of the vehicle body due to inertia due to sudden starts or sudden stops. become. In addition, when driving on a slope, for example, when working along a contour line, the engine 6 may swing to the right or left due to the slope, or the engine 6 may swing along with the vehicle body to the right or left, or to the front or back due to unevenness in the field. Tilt often occurs, and it is necessary to deal with vibrations of the engine 6 caused by such external forces.

また一方、トラクタ１等の作業車両は農道等の移動走行における転倒事故が多く、安全フレーム５８等を常備して転倒に備えるが、係る転倒を防止するために先ず車体の重心を下げる必要があり、この場合、エンジン６もシャーシ２に対して可能な限り低位置で支持して車体の転倒角を大きくする必要がある。また、エンジン６はそのボンネット４９を含めて運転席５６からの作業者の前方視界を阻害する要因となり、さらに、エンジン６を含めてシャーシ２の幅が広いと外側方に設ける前輪９の最大操舵角を大きく取れなかったり、前輪９の操舵状態を運転席５６から確認し難くなり、エンジン６やシャーシ２は可能な限りコンパクトに纏める必要がある。 On the other hand, work vehicles such as tractors 1 often have overturning accidents while traveling on farm roads, etc., and a safety frame 58 etc. is always provided to prepare for overturning, but in order to prevent such overturning, it is first necessary to lower the center of gravity of the vehicle body. In this case, the engine 6 must also be supported at a position as low as possible with respect to the chassis 2 to increase the overturning angle of the vehicle body. In addition, the engine 6, including its bonnet 49, becomes a factor that obstructs the forward view of the operator from the driver's seat 56.Furthermore, if the width of the chassis 2 including the engine 6 is wide, the maximum steering of the front wheels 9 provided on the outside The engine 6 and chassis 2 need to be made as compact as possible because it is difficult to make a large corner and it becomes difficult to check the steering status of the front wheels 9 from the driver's seat 56.

そこで、このような問題に鑑み、シャーシ２の左右側板３に設けるブラケットと、縦置きエンジン６に設けるブラケットの間に防振部材６４、６５を介装し、エンジン６を左右の側板３に防振支持する際に、この防振部材６４、６５の配置形態を見直すことによって、左右の側板３の内側にエンジン６とともに防振部材６４、６５を設けてエンジン６を効果的に防振支持すると共に、エンジン６の過度の振れも安価に規制することができるトラクタ１を提供する。 Therefore, in view of this problem, vibration isolating members 64 and 65 are interposed between the brackets provided on the left and right side plates 3 of the chassis 2 and the brackets provided on the vertically mounted engine 6, and the engine 6 is insulated from the left and right side plates 3. By reviewing the arrangement of the vibration isolating members 64 and 65 during vibration support, the vibration isolating members 64 and 65 are provided along with the engine 6 inside the left and right side plates 3 to effectively support the engine 6 in vibration isolation. At the same time, a tractor 1 capable of controlling excessive vibration of an engine 6 at low cost is provided.

そのため、先ず図６、図１０、及び図１１に示すように、エンジン６を防振支持する左右の側板３の前部寄りの内側に、前後のシャーシ側ブラケット６６、６７を所定の前後間隔をあけて固着（溶着）して設ける。そして、この場合、左右２つの前シャーシ側ブラケット６６はく字状に折曲げて形成する上平板部６６ａを夫々の側板３の内側の内面中程に固着し、また、下平板部６６ｂを左右（水平）方向から内側下方に向けて約３０度傾けて設け、更にその中央部に長手方向を左右方向とする長穴６６ｃを備え、係る左右の下平板部６６ｂをエンジン６の前部左右寄りを防振部材６４を介して支持する前支持部に構成する。 Therefore, first, as shown in FIGS. 6, 10, and 11, the front and rear chassis side brackets 66, 67 are placed at a predetermined distance between the front and rear chassis side brackets 66 and 67 on the inside of the left and right side plates 3 that support the engine 6 in a vibration-proof manner near the front. Open it and fix (weld) it. In this case, the two left and right front chassis side brackets 66 are bent into a dogleg shape and have upper flat plate portions 66a fixed to the middle of the inner surfaces of the respective side plates 3, and the lower flat plate portions 66b are fixed to the left and right sides. It is provided at an angle of about 30 degrees from the (horizontal) direction toward the inside and downward, and is further provided with an elongated hole 66c whose longitudinal direction is the left and right direction in the center thereof, and the left and right lower flat plate parts 66b are located near the front left and right of the engine 6. A front support section supports the vibration isolating member 64 via the vibration isolating member 64.

また、左右２つの後シャーシ側ブラケット６７は直角に折曲げて形成する前平板部６７ａと後平板部６７ｂの一側の端面を夫々の側板３の内側の内面中程に固着し、また、後平板部６７ｂをその板面が水平となるように設け、更に後平板部６７ｂの中央部に長手方向を前後方向とする長穴６７ｃを備え、係る左右の下平板部６７ｂをエンジン６の後部左右寄りを防振部材６５を介して支持する後支持部に構成する。 In addition, the two left and right rear chassis side brackets 67 are bent at right angles, and one end surface of the front flat plate part 67a and the rear flat plate part 67b is fixed to the middle of the inner surface of each side plate 3, and the rear The flat plate part 67b is provided so that its plate surface is horizontal, and furthermore, an elongated hole 67c whose longitudinal direction is the front-rear direction is provided in the center of the rear flat plate part 67b. A rear support portion is configured to support the bias via a vibration isolating member 65.

一方、エンジン６には、その前部と後部の左右寄りに夫々エンジン側ブラケット６８、６９をボルトで取付けて設ける。そして、この場合、左右２つの前エンジン側ブラケット６８は直角に折曲げて形成する後平板部６８ａの後部に鉛直板６８ｄを固着し、この後平板部６８ａと鉛直板６８ｄによってエンジン６の前部左右寄りに取付ける前取付部を構成し、また、前平板部６８ｂを左右（水平）方向から内側下方に向けて約３０度傾けて設け、更に前平板部６８ｂの中央部に前後方向に２つのボルト通し穴６８ｃを設けて、防振部材６４に対する前取付部を構成する。なお、６８ｅは補強プレートである。 On the other hand, the engine 6 is provided with engine side brackets 68 and 69 attached with bolts to the left and right sides of the front and rear parts of the engine 6, respectively. In this case, the two left and right front engine side brackets 68 have a vertical plate 68d fixed to the rear part of a rear flat plate part 68a formed by bending at right angles, and the rear flat plate part 68a and the vertical plate 68d form a front part of the engine 6. It constitutes a front mounting part to be mounted on the left and right side, and the front flat plate part 68b is provided at an angle of about 30 degrees from the left and right (horizontal) direction toward the inside and downward, and furthermore, there are two holes in the center of the front flat plate part 68b in the front and back direction. A front mounting portion for the vibration isolating member 64 is configured by providing a bolt through hole 68c. Note that 68e is a reinforcing plate.

また、左右２つの後エンジン側ブラケット６９はエンジン６の後部左右寄りに取付ける後取付部を構成する鉛直板６９ａを前後方向として設け、また、この鉛直板６９ａに略Ｕ字状に折曲げた平板６９ｂを前後方向に固着し、更に平板６９ｂの中央部にボルト通し穴６９ｃを設けて、防振部材６５に対する後取付部を構成する。 In addition, the two left and right rear engine side brackets 69 are provided with a vertical plate 69a in the front and rear direction that constitutes a rear mounting part that is attached to the rear left and right side of the engine 6, and a flat plate bent into a substantially U-shape is attached to this vertical plate 69a. 69b is fixed in the front-rear direction, and a bolt through hole 69c is provided in the center of the flat plate 69b to form a rear attachment portion for the vibration isolating member 65.

そして、このように形成する左右の前エンジン側ブラケット６８は図４、図５、及び図８に示すように、その前取付部を構成する後平板部６８ａと鉛直板６８ｄをエンジン６のシリンダブロック２２の前部左右下端寄りの前面と側面にボルトで取付け、その防振部材６４に対する前取付部はシリンダブロック２２の前方側に位置させる。また、左右の後エンジン側ブラケット６９は図４、図５、及び図９に示すように、その後取付部を構成する鉛直板６９ａをエンジン６のシリンダブロック２２の後部左右下端寄りの側面にボルトで取付け、その防振部材６５に対する後取付部を構成する平板６９ｂはシリンダブロック２２の外方側に位置させる。 As shown in FIGS. 4, 5, and 8, the left and right front engine side brackets 68 formed in this way are connected to the cylinder block of the engine 6 by connecting the rear flat plate part 68a and the vertical plate 68d, which constitute the front mounting part, to the cylinder block of the engine 6. The vibration isolating member 64 is attached to the front and side surfaces near the left and right lower ends of the front portion of the cylinder block 22 with bolts, and the front attachment portion for the vibration isolating member 64 is located on the front side of the cylinder block 22. In addition, as shown in FIGS. 4, 5, and 9, the left and right rear engine side brackets 69 are attached by bolting a vertical plate 69a that constitutes a mounting portion to the side surface near the rear left and right lower ends of the cylinder block 22 of the engine 6. A flat plate 69b constituting a rear attachment portion for the vibration isolating member 65 is located on the outer side of the cylinder block 22.

一方、左右の前シャーシ側ブラケット６６と左右の前エンジン側ブラケット６８に取付ける防振部材６４は丸型の両ネジタイプの防振ゴムを用い、この防振ゴムの下取付金具６４ａは下方に向かうボルト６４ｂを備え、上取付金具６４ｃは防振ゴムの外周側となる前後位置に上方に向かう２つのボルト６４ｄ、６４ｅを備える。 On the other hand, the vibration isolating members 64 attached to the left and right front chassis side brackets 66 and the left and right front engine side brackets 68 are made of round double screw type vibration isolating rubber, and the lower mounting bracket 64a of this vibration isolating rubber is directed downward. The upper mounting bracket 64c includes two bolts 64d and 64e facing upward at front and rear positions on the outer circumferential side of the vibration isolating rubber.

また、左右の後シャーシ側ブラケット６７と左右の後エンジン側ブラケット６９に取付ける防振部材６５は角型（直方体）の両ネジタイプの防振ゴムを用い、この防振ゴムの下取付金具６５ａは下方に向かうボルト６５ｂを備える共に、その下取付金具６５ａの両端部を上方に折曲げて受部６５ｃ、６５ｄを設ける。また、防振ゴムの上取付金具６５ｅは上方に向かうボルト６５ｆを備える共に、その上取付金具６５ｅの両端部を下方に折曲げ、その曲げ部６５ｇ、６５ｈの内面側に端面に沿う水平方向となる緩衝突起６５ｉ、６５ｊをラバーコーティングによって一体成型する。 In addition, the vibration isolating members 65 attached to the left and right rear chassis side brackets 67 and the left and right rear engine side brackets 69 are made of square (rectangular parallelepiped) double screw type vibration isolating rubber, and the lower mounting bracket 65a of this vibration isolating rubber is A bolt 65b directed downward is provided, and both ends of the lower mounting bracket 65a are bent upward to provide receiving portions 65c and 65d. The upper mounting bracket 65e of the anti-vibration rubber is provided with bolts 65f pointing upward, and both ends of the upper mounting bracket 65e are bent downward, and the inner surfaces of the bent portions 65g and 65h are provided with a horizontal direction along the end surface. The buffer projections 65i, 65j are integrally molded with rubber coating.

そのため、係る防振部材６５は、その角型の防振ゴムにその長手方向となる横方向に向かうせん断力が加わると、一方の緩衝突起６５ｉと受部６５ｃ、或いは他方の緩衝突起６５ｊと受部６５ｄが当接してそれ以上の相対的な変位を阻止するマウントストッパを備える防振部材（マウントストッパ付き防振部材）となっている。 Therefore, in the vibration isolating member 65, when a shear force is applied to the rectangular vibration isolating rubber in the lateral direction, which is the longitudinal direction, one of the buffer protrusions 65i and the receiving portion 65c, or the other buffer protrusion 65j and the receiver The vibration isolating member (vibration isolating member with a mount stopper) includes a mount stopper that the portion 65d comes into contact with and prevents further relative displacement.

そして、このように構成する前者の防振部材６４は、前エンジン側ブラケット６８の前平板部６８ｂの下面に上取付金具６４ｃの上面が重なるように、夫々の２つのボルト通し穴６８ｃにボルト６４ｄ、６４ｅを通して上方からナットで締結して取付ける。また、エンジン６を上方から降ろして、防振部材６４の下取付金具６４ａに設けるボルト６４ｂを前シャーシ側ブラケット６６の長穴６６ｃに通して下方からナットで締結して取付ける。 In the former vibration isolating member 64 configured in this way, the bolts 64d are inserted into the respective two bolt through holes 68c such that the upper surface of the upper mounting bracket 64c overlaps the lower surface of the front flat plate portion 68b of the front engine side bracket 68. , 64e and tighten them from above with nuts. Further, the engine 6 is lowered from above, and the bolts 64b provided on the lower mounting bracket 64a of the vibration isolating member 64 are passed through the elongated holes 66c of the front chassis side bracket 66 and fastened with nuts from below.

さらに、後者の防振部材６５は、後エンジン側ブラケット６９の平板６９ｂの下面に上取付金具６５ｄの上面が重なるように、ボルト通し穴６９ｃにボルト６５ｅを通して上方からナットで締結して取付け、その際、防振部材６５はその角型の防振ゴムの長手方向が平板６９ｂの長手方向と一致するように平板６９ｂに沿わせて設ける。また、エンジン６を上方から降ろして、防振部材６５の下取付金具６５ａに設けるボルト６５ｂを後シャーシ側ブラケット６７の長穴６７ｃに通して下方からナットで締結して取付ける。 Furthermore, the latter vibration isolating member 65 is installed by passing a bolt 65e through a bolt hole 69c and fastening it with a nut from above so that the upper surface of the upper mounting bracket 65d overlaps the lower surface of the flat plate 69b of the rear engine side bracket 69. At this time, the vibration isolating member 65 is provided along the flat plate 69b so that the longitudinal direction of the square vibration isolating rubber coincides with the longitudinal direction of the flat plate 69b. Further, the engine 6 is lowered from above, and the bolts 65b provided on the lower mounting bracket 65a of the vibration isolating member 65 are passed through the elongated holes 67c of the rear chassis side bracket 67 and fastened with nuts from below.

なお、エンジン６を上方から降ろして防振部材６５を後シャーシ側ブラケット６７に取付ける際に、防振部材６５がその取付時のエンジン６等の傾きによってせん断方向（前後方向）に振れている場合があり、この場合には一方の緩衝突起６５ｉと受部６５ｃ、また、他方の緩衝突起６５ｊと受部６５ｄとの間の隙間が正しく確保されて防振部材６５が適正に取付けられていないことになる。 Note that when the engine 6 is lowered from above and the vibration isolating member 65 is attached to the rear chassis side bracket 67, if the vibration isolating member 65 swings in the shear direction (front-back direction) due to the inclination of the engine 6 etc. at the time of installation. In this case, the gap between the buffer protrusion 65i on one side and the receiving part 65c, and the gap between the buffer protrusion 65j on the other side and the receiving part 65d is not properly secured and the vibration isolating member 65 is not properly installed. become.

そこで、このような取付けを防止するために一方の緩衝突起６５ｉと受部６５ｃ、又は他方の緩衝突起６５ｊと受部６５ｄとの間に適正な隙間に相当する厚さのリーフを差し込んで、下取付金具６５ａに設けるボルト６５ｂの長穴６７ｃの前後方向における取付位置を調節したうえでナットの締結を行う。なお、この場合、隙間にリーフを下方から差し込みし易くするために、後シャーシ側ブラケット６７の後平板部６７ｂの後端を、防振部材６５の取付時の下取付金具６５ａの受部６５ｄより後方側にはみ出さないように前方側の位置に止め置く。 Therefore, in order to prevent such attachment, a leaf with a thickness corresponding to an appropriate gap is inserted between one buffer protrusion 65i and the receiving part 65c, or the other buffer protrusion 65j and the receiving part 65d. After adjusting the mounting position in the front-rear direction of the elongated hole 67c of the bolt 65b provided on the mounting bracket 65a, the nut is fastened. In this case, in order to make it easier to insert the leaf into the gap from below, the rear end of the rear flat plate part 67b of the rear chassis side bracket 67 should be moved from the receiving part 65d of the lower mounting bracket 65a when the vibration isolating member 65 is installed. Place it in the front position so that it does not protrude to the rear.

以上、エンジンマウントに関するシャーシ２側とエンジン６側に設けるブラケット６６～６９、防振部材６４、６５、及びこれ等の取付けの詳細について説明したが、次に、エンジン６を縦置きとしてシャーシ２に防振支持する際の、特に防振部材６４、６５の配置形態から本発明のエンジンマウントについて纏めて説明すると、縦置きエンジン６の前部左右寄りを支持する夫々の防振部材６４は、その圧縮方向を左右方向に傾けて設ける傾斜形態で設け、また、縦置きエンジン６の後部左右寄りを支持する夫々の防振部材６５は、その圧縮方向を上下方向とする平置形態で設ける。 The details of the brackets 66 to 69, vibration isolating members 64 and 65, and their installation related to the engine mount provided on the chassis 2 side and the engine 6 side have been explained above. To summarize the engine mount of the present invention, particularly from the arrangement form of the vibration isolating members 64 and 65 when providing vibration isolating support, the vibration isolating members 64 that support the left and right sides of the front part of the vertical engine 6 are The vibration isolating members 65 are provided in an inclined form with the compression direction inclined in the left-right direction, and the vibration isolating members 65 supporting the left and right rear portions of the vertically installed engine 6 are provided in a horizontal form with the compression direction being in the up-down direction.

より詳細に説明すると図８に示すように、エンジン６の前部左右寄りを支持する防振部材６４は、その防振ゴムの圧縮軸Ｚとして左右方向とする水平線を上下方向に約６０度傾けた方向に設ける。また、望ましくは左右の防振部材６４の防振ゴムの２つの圧縮軸Ｚが交わる交点Ｇが、エンジン６の重心を通る前後方向の軸線上に位置するように互いに傾けて対向させて設ける。そのため、左右の防振部材６４は、縦置きエンジン６の左右方向の振れに対する防振支持効果と、上下方向となるエンジン６の重量を支える防振支持効果を合わせて期待することができる。 To explain in more detail, as shown in FIG. 8, the vibration isolating member 64 that supports the left and right sides of the front part of the engine 6 is tilted approximately 60 degrees vertically with respect to the horizontal line defined as the left and right direction as the compression axis Z of the vibration isolating rubber. installed in the opposite direction. Preferably, the vibration isolating members 64 are provided so that the intersection point G where the two compression axes Z of the vibration isolating rubbers of the left and right vibration isolating members 64 intersect is located on the longitudinal axis passing through the center of gravity of the engine 6, so that they are inclined and facing each other. Therefore, the left and right vibration isolating members 64 can be expected to have a vibration damping support effect against vibrations of the vertically installed engine 6 in the left and right direction, and a vibration damping support effect that supports the weight of the engine 6 in the vertical direction.

一方、図９に示すように、エンジン６の後部左右寄りを支持する防振部材６５は、その防振ゴムの圧縮軸Ｚを上下方向に設け、せん断軸Ｘを前後方向や左右方向に設ける。そのため、左右の防振部材６５は、縦置きエンジン６の前後方向や左右方向の振れに対する防振支持効果はあまり期待することができないが、上下方向となるエンジン６の重量を支える防振支持効果は大である。 On the other hand, as shown in FIG. 9, in the vibration isolating member 65 that supports the rear left and right sides of the engine 6, the compression axis Z of the vibration isolating rubber is provided in the vertical direction, and the shear axis X is provided in the front and rear direction and the left and right direction. Therefore, the left and right vibration isolating members 65 cannot be expected to have much of a vibration damping support effect against the vibrations of the vertically mounted engine 6 in the longitudinal direction or the left and right directions, but they have a vibration damping support effect that supports the weight of the engine 6 in the vertical direction. is large.

従って、この傾斜形態で設けるエンジン６の前部左右寄りを支持する防振部材６４と平置形態で設けるエンジン６の後部左右寄りを支持する防振部材６５によって、エンジンマウントにおける防振、制振、支持機能を配置形態の異なる防振部材６４、６５に振り分けて備えさせ、エンジン６を効果的に防振支持することができる。 Therefore, by using the vibration isolating member 64 that supports the front left and right sides of the engine 6 provided in this inclined form and the vibration isolator 65 that supports the rear left and right sides of the engine 6 that is provided in a horizontally placed form, vibration isolation and damping in the engine mount can be achieved. By distributing support functions to the vibration isolating members 64 and 65 having different arrangement configurations, it is possible to effectively support the engine 6 in vibration isolation.

また、エンジンマウントについて冒頭で説明するように、エンジン６の前部左右寄りと後部左右寄りを支持する防振部材６４、６５を全て傾斜形態で設けると、防振部材６４、６５の傾斜に伴う左右方向の配置スペースの増大によって、シャーシ２の左右の側板３の間にエンジン６の下部と共に防振部材６４、６５を設けることができず、傾斜する防振部材６４を側板３の上方に設けるといった対策を取らざるを得ない。 Furthermore, as explained at the beginning regarding the engine mount, if the vibration isolating members 64 and 65 that support the front left and right sides and the rear left and right sides of the engine 6 are all provided in an inclined form, the vibration isolating members 64 and 65 will be tilted. Due to the increase in the arrangement space in the left and right direction, it is not possible to provide the vibration isolating members 64 and 65 together with the lower part of the engine 6 between the left and right side plates 3 of the chassis 2, and the inclined vibration isolating member 64 is provided above the side plates 3. We have no choice but to take such measures.

しかし、エンジン６の前部左右寄りと後部左右寄りを支持する夫々の防振部材６４、６５を、その圧縮方向を左右方向に傾けて設ける傾斜形態と、その圧縮方向を上下方向とする平置形態に分けると、傾斜形態で設ける防振部材６４をエンジン６の下部寄りに存在する空きスペース、詰まり、エンジン６のシリンダブロック２２の前部側、又はエンジン６の配置方向によっては後部側に設けるギヤケース２４や冷却ファン２６の下方となるシリンダブロック２２の前方、又は後方に設けることができる。 However, the vibration isolating members 64 and 65 that support the front left and right sides and the rear left and right sides of the engine 6 are provided with the compression direction tilted in the left and right direction, and the vibration isolation members 64 and 65 that support the front left and right sides and the rear left and right sides of the engine 6 are provided in an inclined form with the compression direction tilted in the left and right direction, and in a horizontal configuration where the compression direction is the up and down direction. In terms of form, the vibration isolating member 64 is provided in an inclined form in an empty space near the bottom of the engine 6, in a blockage, on the front side of the cylinder block 22 of the engine 6, or on the rear side depending on the arrangement direction of the engine 6. It can be provided at the front or rear of the cylinder block 22, which is below the gear case 24 and the cooling fan 26.

また、空きスペースが無く傾斜形態では設けることができない防振部材６５であっても、配置スペースの少ない平置形態に変えればこの防振部材６５をエンジン６の下部の外方側、詰まり、エンジン６のリヤプレート２９やフライホイール３０を避けたシリンダブロック２２の外方側に設けることができる。 In addition, even if the vibration isolating member 65 cannot be installed in an inclined configuration due to lack of free space, if the vibration isolating member 65 is changed to a horizontal configuration with less space, it is possible to install the vibration isolating member 65 on the outer side of the lower part of the engine 6. It can be provided on the outer side of the cylinder block 22, avoiding the rear plate 29 and flywheel 30 of No. 6.

従って、シャーシ２の左右側板３にエンジン６を防振支持する際に、この防振部材６４、６５の配置形態を見直すことによって、左右の側板３の内側にエンジン６とともに防振部材６４、６５を設けることができるようになり、しかも、その場合に可能な限りエンジン６の高さを低く抑えて、運転席５６からの前方視界の悪化や機体の転倒を防止しながら、制約を受けるシャーシ２の幅内にエンジン６を防振支持して、機体の軽量化やコンパクト化を図ることができる。 Therefore, when supporting the engine 6 in vibration isolation on the left and right side plates 3 of the chassis 2, by reviewing the arrangement of the vibration isolating members 64 and 65, the vibration isolating members 64 and 65 can be placed inside the left and right side plates 3 along with the engine 6. In this case, the height of the engine 6 can be kept as low as possible to prevent the forward visibility from the driver's seat 56 from worsening and the aircraft from falling over, while also reducing the height of the chassis 2, which is subject to restrictions. By supporting the engine 6 in a vibration-proof manner within the width of , it is possible to reduce the weight and size of the aircraft body.

なお、エンジン６の前後方向の過度の振れは、防振部材６４、６５を傾斜形態や平置形態に設けるだけでは抑え難い。そこで、係る前後方向の過度の振れに対しては、平置形態で設ける左右の防振部材６５に夫々マウントストッパ（下取付金具６５ａの受部６５ｃ、６５ｄと上取付金具６５ｅの緩衝突起６５ｉ、６５ｊ）を一体に組込み、このマウントストッパが前後方向の振れに対して作用するように防振部材６５の取付方向を前後方向に合わせて設ける。 Note that excessive vibration of the engine 6 in the longitudinal direction cannot be suppressed simply by providing the vibration isolating members 64 and 65 in an inclined configuration or a flat configuration. Therefore, in order to prevent such excessive vibration in the front-back direction, mount stoppers (receiving portions 65c, 65d of the lower mounting bracket 65a and buffer protrusions 65i of the upper mounting bracket 65e, 65j) is integrally assembled, and the mounting direction of the vibration isolating member 65 is provided to match the front-rear direction so that this mount stopper acts against vibrations in the front-rear direction.

そのため、エンジン側やシャーシ側ブラケット６６～６９にマウントストッパとして機能させる部材や加工を施す必要がなく、簡単に又安価にエンジン６の前後方向の過度の振れを規制することができ、これによりエンジン６の周辺に設ける機器との当接を確実に防止することができる。また、エンジン６の左右方向の振れは傾斜形態で設ける防振部材６４で防止するものの、左右方向の過度の振れに対して安全性を高めるために、前後方向と同様にマウントストッパを設ける。 Therefore, there is no need to provide any parts or processing to the engine side or chassis side brackets 66 to 69 to function as mount stoppers, and it is possible to easily and inexpensively control excessive vibration of the engine 6 in the longitudinal direction. 6 can be reliably prevented from coming into contact with equipment provided around it. Furthermore, although the horizontal vibration of the engine 6 is prevented by the vibration isolating member 64 provided in an inclined manner, a mount stopper is provided in the same manner as in the longitudinal direction in order to increase safety against excessive vibration in the horizontal direction.

そして、この場合のマウントストッパは、平置形態で設ける左右の防振部材６５の上取付金具６５ｅ、或いはこの防振部材６５を取付ける後エンジン側ブラケット６９の平板６９ｂの外端部を左右の側板３の内側に少ない隙間Ｓをもって近接させて設け、この近接する防振部材６５、或いは後エンジン側ブラケット６９の外端部が左右の側板３に当接した際に、エンジン６のその以上の左右方向の振れを規制するから、新たに規制部材を設ける必要がなく極めて簡素な構造によって、エンジン６の周辺に設ける機器との当接を確実に防止することができる。 In this case, the mount stopper is the upper mounting bracket 65e of the left and right vibration isolating members 65 provided in a horizontally placed form, or the outer end of the flat plate 69b of the engine side bracket 69 after the vibration isolating members 65 are attached to the left and right side plates. 3 with a small gap S, and when the adjacent vibration isolating member 65 or the outer end of the rear engine side bracket 69 comes into contact with the left and right side plates 3, the left and right sides of the engine 6 Since the vibration in the direction is restricted, there is no need to newly provide a restriction member, and contact with equipment provided around the engine 6 can be reliably prevented with an extremely simple structure.

以上、縦置きエンジン６のマウント装置について説明したが、そのエンジン６のレイアウトに関しては実施形態とは逆に、エンジン６のシリンダブロック２２の後部側にギヤケース２４や冷却ファン２６を設け、また、このシリンダブロック２２の前部側にリヤプレート２９やフライホイール３０を設けるようにしてもよい。また、傾斜形態で設ける防振部材６４、或いは平置形態で設ける防振部材６５は多少前後方向に傾けて設け、これによりエンジン６の前後方向の振れに対する防振支持効果を備えさせてもよい。 The mounting device for the vertical engine 6 has been described above, but the layout of the engine 6 is contrary to the embodiment in that the gear case 24 and cooling fan 26 are provided on the rear side of the cylinder block 22 of the engine 6. A rear plate 29 and a flywheel 30 may be provided on the front side of the cylinder block 22. Further, the vibration isolating member 64 provided in an inclined form or the vibration isolating member 65 provided in a horizontal form may be provided slightly inclined in the front-rear direction, thereby providing a vibration-proof support effect against vibrations of the engine 6 in the front-rear direction. .

なお、傾斜形態で設ける左右の防振部材６４側のエンジン６の左右方向の振れはマウントストッパを用いて規制していないが、この側は元々左右の防振部材６４を傾斜形態で設けることによってエンジン６の左右方向の振れを防振部材６４自体で抑制するものであるから、エンジン６の左右方向の振れの規制を積極的に行う必要はない。しかし、万が一のために例えば、前エンジン側ブラケット６８に左右側板３に向かう規制部を設けて、この規制部の側板３との当接によってエンジン６のその以上の左右方向の振れを規制するようにしてもよく、必ずしも本発明は、前記実施形態に限定されるものではない。 Although the horizontal vibration of the engine 6 on the side of the left and right vibration isolating members 64 provided in an inclined form is not controlled using a mount stopper, this side is originally provided with the left and right vibration isolating members 64 in an inclined form. Since the horizontal vibration of the engine 6 is suppressed by the vibration isolating member 64 itself, there is no need to actively restrict the vibration of the engine 6 in the horizontal direction. However, just in case, for example, a regulating part facing the left and right side plates 3 is provided on the front engine side bracket 68, and the further vibration of the engine 6 in the left and right direction is controlled by the contact of this regulating part with the side plate 3. However, the present invention is not necessarily limited to the above embodiment.

１トラクタ（作業車両）
２シャーシ
３側板
６エンジン
７トランスミッションケース
６４防振部材（傾斜形態）
６５防振部材（平置形態）
６６前シャーシ側ブラケット
６７後シャーシ側ブラケット
６８前エンジン側ブラケット
６９後エンジン側ブラケット
６５ｉ、６５ｊ緩衝突起（マウントストッパ） 1 Tractor (work vehicle)
2 Chassis 3 Side plate 6 Engine 7 Transmission case 64 Vibration isolation member (tilted form)
65 Vibration isolation member (flat type)
66 Front chassis side bracket 67 Rear chassis side bracket 68 Front engine side bracket 69 Rear engine side bracket 65i, 65j Buffer protrusion (mount stopper)

Claims

シャーシのサイドメンバーを構成する左右の側板と、この左右の側板の内側に夫々設ける前後のシャーシ側ブラケットと、縦置きエンジンの前部と後部の左右寄りに夫々設けるエンジン側ブラケットの間に防振部材を介装して、エンジンを左右の側板に防振支持する際に、前記エンジンの前部左右寄りと後部左右寄りを支持する夫々の防振部材を、その圧縮方向を左右方向に傾けて設ける傾斜形態と、その圧縮方向を上下方向とする平置形態で設けると共に、前記防振部材を介して支持するエンジンの所定以上の前後方向の振れを規制するマウントストッパを備えることを特徴する作業車両。 Vibration isolation is installed between the left and right side plates that make up the side members of the chassis, the front and rear chassis side brackets that are installed inside these left and right side plates, and the engine side brackets that are installed on the left and right sides of the front and rear of the vertically mounted engine. When supporting the engine on the left and right side plates for vibration isolation by interposing members, the compression direction of each of the vibration isolation members supporting the front left and right sides and the rear left and right sides of the engine is tilted in the left and right direction. The work is characterized in that it is provided in an inclined form, and is provided in a horizontal form with its compression direction being the vertical direction, and is provided with a mount stopper that restricts vibrations of the engine supported via the vibration isolating member in the longitudinal direction beyond a predetermined value. vehicle.

前記縦置きエンジンは、そのシリンダブロックの前部側にギヤケースや冷却ファンを設け、また、このシリンダブロックの後部側にリヤプレートやフライホイールを設けると共に、前記エンジンの前部左右寄りに設けるエンジン側ブラケットをシリンダブロックの前部左右下端寄りに取付けて、前記傾斜形態で設ける防振部材をシリンダブロックの前方側に設け、さらに、エンジンの後部左右寄りに設けるエンジン側ブラケットをシリンダブロックの後部左右下端寄りに取付けて、前記平置形態で設ける防振部材をリヤプレートやフライホイールを避けたシリンダブロックの外方側に設けることを特徴する請求項１に記載の作業車両。 The vertical engine is provided with a gear case and a cooling fan on the front side of the cylinder block, a rear plate and a flywheel on the rear side of the cylinder block, and an engine side that is provided on the front left and right side of the engine. A bracket is attached to the front left and right lower ends of the cylinder block, the vibration isolating member provided in the slanted form is provided to the front side of the cylinder block, and an engine-side bracket provided near the rear left and right of the engine is attached to the rear left and right lower ends of the cylinder block. 2. The work vehicle according to claim 1, wherein the vibration isolating member is mounted on an outer side of the cylinder block so as to avoid the rear plate and the flywheel.

前記マウントストッパは、前記平置形態で設ける左右の防振部材に夫々一体に組込んで、エンジンの前後方向の振れを規制することを特徴とする請求項１又は請求項２に記載の作業車両。 The work vehicle according to claim 1 or 2, wherein the mount stopper is integrated into the left and right vibration isolating members provided in the horizontally placed configuration, respectively, to restrict vibration of the engine in the longitudinal direction. .

前記平置形態で設ける左右の防振部材、或いはこの防振部材を取付けるエンジン側ブラケットの外端部を左右の側板の内側に近接させて設け、この近接する防振部材、或いはエンジン側ブラケットの外端部が左右の側板に当接した際に、エンジンのその以上の左右方向の振れを規制することを特徴とする請求項３に記載の作業車両。 The left and right vibration isolating members provided in the horizontal configuration, or the outer ends of the engine side brackets to which these vibration isolating members are attached, are provided close to the inside of the left and right side plates, and the adjacent vibration isolating members or engine side brackets are installed close to each other. 4. The work vehicle according to claim 3, wherein when the outer end portion contacts the left and right side plates, further vibration of the engine in the left and right direction is restricted.