JP3790482B2 - Working vehicle engine mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine mounting structure for a work vehicle such as a riding rice transplanter or a riding lawn mower.
[0002]
[Prior art]
Many of the work vehicles described above have a working device connected to the rear part of the vehicle body, so that an engine is mounted in front of the driver's seat and covered with a bonnet in order to balance the weight of the vehicle body.
[0003]
[Problems to be solved by the invention]
Installing the engine in front of the driver's seat is effective for balancing the front / rear weight of the vehicle body, but the minimum ground height is necessary and sufficient to obtain the driving performance in the field and where there are large undulations. Therefore, if the engine mounting position is increased, the engine mounting portion at the front of the vehicle body becomes bulky and the front view is deteriorated.
In recent years, it has been desired to improve the driving environment even in the work vehicles as described above, and as one of them, it is necessary to suppress the vibration and noise of the engine and to make the driving part quiet. Yes.
[0004]
The object of the present invention is to eliminate the above-mentioned problems and demands related to the engine mounting structure of a work vehicle.
[0005]
[Means for Solving the Problems]
[Configuration, Action, and Effect of Invention of Claim 1]
[0006]
In the engine mounting structure of the work vehicle according to the first aspect of the present invention, the engine is disposed in a state where the cylinder portion is largely inclined so that the cylinder portion projects obliquely upward with respect to the crankcase portion, A cooling air flow path of the air cooling means is provided with air cooling means for vibration-proofing the lower part and the cylinder part to a vehicle body fixing part that supports the weight of the engine via a vibration isolating material and forcibly supplying cooling air around the cylinder part. An anti-vibration support portion for the cylinder portion is positioned inside .
[0007]
According to the above configuration, the overall height of the engine mounted on the vehicle body is lower than the overall height of the engine in a posture in which the cylinder portion is erected, and can be mounted and arranged on the vehicle body at a low volume. In addition, since the cylinder part protrudes from the crankcase part, the cylinder part is likely to be shaken, and the stability is lowered and vibrations are likely to occur, but not only the lower part of the crankcase part but also the cylinder part is interposed with a vibration isolator. By supporting the engine, it is possible to obtain an engine mounted state with a high anti-vibration effect.
Further, according to the above configuration, the vibration isolating support portion for the cylinder portion is easily heated by heat conduction and radiation from the cylinder portion, but heat dissipation is promoted by the engine cooling air being applied to the vibration isolating support portion, The anti-vibration rubber of the anti-vibration support part is not thermally deteriorated.
[0008]
Therefore, according to the first aspect of the present invention, the engine can be mounted with a low bulk, and a decrease in stability due to the tilting of the cylinder portion can be effectively suppressed by a rational vibration-proof support having a large span.
In addition, the anti-vibration rubber used for the anti-vibration support portion of the cylinder portion that is at a high temperature has high thermal durability while the engine can be effectively anti-vibration support between the crankcase portion and the cylinder portion. Thus, it is possible to exhibit good vibration isolation performance over a long period of time.
[0009]
[Configuration, Action, and Effect of Invention of Claim 2]
[0010]
According to a second aspect of the present invention, there is provided the engine mounting structure for a working vehicle according to the first aspect of the invention, wherein the anti-vibration support portion of the crankcase portion is provided only at the end of the crankcase opposite to the cylinder portion extending direction. .
[0011]
According to the above configuration, the engine can be supported in a vibration-proof manner with a large span and with a few vibration-proof support portions.
[0012]
[Configuration, Action, and Effect of Invention of Claim 3]
[0013]
According to a third aspect of the present invention, there is provided the engine mounting structure of the working vehicle according to the first or second aspect, wherein a horizontally long stay is provided below the projecting and inclined cylinder portion so that the stay and the cylinder portion are connected to each other. A plurality of anti-vibration support portions for the vehicle body fixing portion are provided in the vicinity of both ends of the stay while being connected at a plurality of locations in the longitudinal direction.
[0014]
According to the above configuration, the places where other members can be attached in the cylinder part are limited, but the attachment points of the horizontally long stay connected to the lower part of the cylinder part to the vehicle body fixing part are compared according to the length and shape of the stay. Can be set freely.
[0015]
Therefore, by indirectly supporting the anti-vibration via the horizontally long stay connected to the cylinder part, it is easy to set the anti-vibration support position compared to the case where the cylinder part is directly anti-vibration supported, and it is highly effective. Anti-vibration support is possible. In addition, heat from the cylinder part is not easily transmitted to the vibration isolating rubber of the vibration isolating support part, and the vibration isolating support having high durability can be performed.
[0016]
[Configuration, Action, and Effect of Invention of Claim 4]
[0017]
According to a fourth aspect of the present invention, there is provided the engine mounting structure for a working vehicle according to the third aspect of the present invention, wherein a pair of vibration isolating support portions for the vehicle body fixing portions provided in the vicinity of both ends of the stay are connected to the stay and the cylinder portion. It is located outside the region.
[0018]
According to the above configuration, the vibration isolating support can be performed with a span larger than the diameter of the cylinder portion, and the anti-vibration effect against complex vibrations including twist vibrations is also high.
[0019]
[Configuration, Action, and Effect of Invention of Claim 5]
[0020]
According to a fifth aspect of the present invention, there is provided the engine mounting structure for a work vehicle according to any one of the first to fourth aspects, wherein the speed change structure portion for receiving the engine power is inserted below the cylinder portion that is inclined and projected. It is characterized by being arranged.
[0021]
According to the above configuration, the tilted cylinder part of the engine and the speed change structure part that receives engine power overlap vertically, and the engine and the speed change structure part can be combined in a compact manner, which is effective for downsizing the vehicle body. Become.
[0022]
[Configuration, Action, and Effect of Invention of Claim 6]
[0023]
According to a sixth aspect of the present invention, there is provided an engine mounting structure for a work vehicle according to the fifth aspect, wherein an engine output shaft horizontally supported by the crankcase portion and an input shaft horizontally supported by the transmission structure portion are connected to a belt transmission mechanism. It is linked and connected through.
[0024]
According to the above configuration, since the cylinder portion projects from the crankcase portion, the cylinder portion is likely to be shaken, so that the stability is lowered and vibration is likely to occur. In addition, the engine is likely to be shaken by the tension fluctuation of the belt transmission mechanism due to the load fluctuation applied to the speed change structure part, but by supporting not only the lower part of the crankcase part but also the cylinder part via the vibration isolator. An engine mounted state with a high anti-vibration effect can be obtained.
[0025]
Therefore, according to the sixth aspect of the invention, the engine and the speed change structure can be arranged in a compact manner, and an engine whose stability is likely to be lowered due to fluctuations in the posture of the engine itself and the tension of the belt transmission mechanism is effective. It became possible to support vibration isolation.
[0026]
[Configuration, Action, and Effect of Invention of Claim 7]
[0027]
According to a seventh aspect of the present invention, there is provided the engine mounting structure for a work vehicle according to the sixth aspect of the present invention, wherein the cylinder portion is supported on an upper portion of the transmission structure portion via a vibration isolating material, and the vibration isolating support for the cylinder portion is provided. Part.
[0028]
According to the above-described configuration, the speed change structure portion that has entered the lower portion of the cylinder portion can be effectively used as a vehicle body fixing portion at a high position, and the cylinder portion is preferably supported in a vibration-proof manner without requiring a dedicated mounting base. This is effective in simplifying the engine mounting structure.
[0029]
[Configuration, Action, and Effect of Invention of Claim 8]
[0030]
The engine mounting structure of the working vehicle of the invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the engine is accommodated in a bonnet provided in front of a driver seat, and the cylinder portion The slant overhang direction is the rear upward direction.
[0031]
According to the above configuration, the engine and the speed change structure portion are compactly assembled in the front-rear direction. In addition, the engine viewed from the driver's seat is low in volume and is arranged in a forward-downward inclined posture, and the bonnet that covers the engine can also be lowered in front of the low-bulk.
[0032]
Therefore, according to the invention of claim 8, it is effective in reducing the longitudinal length of the vehicle body, and is effective in constructing a vehicle body with a good sight of the front by making the bonnet low in volume and falling forward.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an entire side surface of a passenger rice transplanter which is an example of a work vehicle having an engine mounting structure according to the present invention, FIG. 2 shows its entire plane, and FIG. 3 shows its entire front. This riding rice transplanter 4 is connected to a rear part of a four-wheel drive type traveling vehicle body 3 having a steerable front wheel 1 and a non-steerable rear wheel 2 via an elevating link mechanism 5 driven by a hydraulic cylinder 4. The seedling planting device 6 of the strip planting specification is connected to be movable up and down.
[0034]
The seedling planting device 6 is connected to the lower part of the rear end of the elevating link mechanism 5 in a freely rolling manner. The feed case 10 that receives the working power from the traveling machine 3 and the seedling are placed and reciprocated horizontally by a fixed stroke. Seedling platform 11, a pair of left and right planting cases 12 extending from the feed case 10 in a cantilevered manner, a crank type planting mechanism 13 mounted on the rear end of each planting case 11, It comprises three leveling floats 14 for leveling the planned planting location, a pair of left and right drawing markers 15 that can swing up and down by scratching and forming a running reference line for the next stroke on the paddy field.
[0035]
A transmission case 21 that supports the front wheel 1 in a freely steerable manner is connected to the front portion of the main frame 20 in the traveling machine body 3, and an air-cooled type is disposed above the front frame 22 that projects forward from the transmission case 21. As will be described later, the gasoline engine 23 is supported by vibration isolation and is covered with a hood 24. A rear transmission case 25 having a rear wheel 2 is connected and supported in a freely rolling manner at the rear of the main frame 20, and a driving step 26 and a rear wheel fender 27 are provided on the upper portion of the main frame 20. A driver's seat 28 is provided in the upper center.
[0036]
A hydraulic continuously variable transmission (HST) 30 is connected to the left side surface of the mission case 21 as a traveling main transmission that continuously shifts forward and backward. The mission case 21 and the continuously variable transmission 30 are connected to each other. A speed change structure A for the traveling vehicle body 3 and the seedling planting device 6 is configured. The output shaft 23c horizontally supported on the left side of the engine 23 and the input shaft 30a horizontally supported on the left side of the continuously variable transmission 30 are interlocked via a belt transmission mechanism 32 having a tension clutch 31 functioning as a main clutch. It is connected. The shifting power from the continuously variable transmission 30 is branched into a traveling system and a working system in the mission case 21, and the branching power of the traveling system is shifted in two stages by an internally-equipped gear-type sub-transmission device. And a part of the output from the auxiliary transmission is transmitted to the rear transmission case 25, and the left and right rear wheels 2 are driven at a speed synchronized with the front wheels 1. Further, only the forward rotation power of the branched work system power is taken out from the rear portion of the transmission case 21 via the one-way clutch, and is transmitted to the seedling planting device 6 through an axis.
[0037]
The main transmission lever 33 for operating the continuously variable transmission 30 and the auxiliary transmission lever 34 for switching the gear-type auxiliary transmission in the case are respectively provided on the left side of the steering handle 35 provided at the rear of the bonnet 24. It is deployed so that it can be swung. An accelerator lever 39 linked to the engine 23 is provided on the right side of the steering handle 35 so as to be able to swing back and forth.
[0038]
A main clutch / brake pedal 36 is provided in front of the driving step 26 on the right side. By depressing the pedal 36, the tension clutch 31 is operated to cut off power transmission from the engine 23 to the continuously variable transmission 30. At the same time, the brakes in the transmission case are operated to brake the traveling system. Further, a differential lock pedal 37 for the front wheels is provided on the right rear side of the driving step 26. By depressing the pedal 34, the differential device for the left and right front wheels 1 is differentially locked, and the left and right front wheels 1 are driven at a constant speed. Can be done. Further, an elevating lever for operating the hydraulic cylinder 4 for elevating the seedling planting device 6 is arranged on the right side of the driver seat 28.
[0039]
A handle post 41 that pivotally supports the steering handle 35 is erected and fixed to the upper surface of the transmission case 21 in a slightly rearward posture via a sheet metal mounting seat 41a provided at the lower end thereof. A flat steering gear case 42 is attached to the lower side of the frame 22, and when the steering handle 35 is rotated, the pitman arm 43 provided at the front part of the lower surface of the steering gear case 42 is decelerated and rotated. The left and right front wheels 1 that are interlocked and connected to both left and right ends via tie rods 44 are steered.
[0040]
A pressing arm 46 formed by bending the pipe material into an arch shape is attached to the front end portion of the traveling machine body 3 so as to be swingable back and forth around the fulcrum a of the base end portion. A center mascot 47 serving as a sight for the running reference line formed by the line drawing marker 15 is attached to the upper end of the line. In addition, on the left and right sides of the front part of the machine body, there are standing seedling stands 48 on which spare seedlings are loaded and stored.
[0041]
The pressing arm 46 is pivotally supported so as to be able to swing up and down within a certain range extending from an action posture that protrudes largely forward and a stowed storage posture, and at any swing position by friction applied to the pivot base portion. It is also possible to hold friction, and when the operator descends to the ground and steers while traveling the traveling machine body 3 at a slow speed, such as over a fence or loading a rice transplanter onto the loading platform of a transport vehicle, Tilt it down and use it in its working position. The ground operator can hold down the holding arm 46 that has fallen in the acting posture, so that the front part of the machine body can be prevented from rising, and the holding arm 46 can be moved to the left and right to drag the machine body to some extent. You can also forcibly correct the orientation of the aircraft.
[0042]
In the passenger rice transplanter configured as described above, in the present invention, the engine 23 is mounted on the front part of the fuselage as follows, and the detailed structure thereof will be described below with reference to FIGS. To do.
[0043]
The engine 23 has a specification in which the cylinder portion 23b is inclined at about 30 ° with respect to the horizontal so that the cylinder portion 23b extends obliquely upward and rearward relative to the crankcase portion 23a. In addition, the front portion of the transmission structure portion A is disposed below the projecting cylinder portion 23b, the engine 23 is disposed low in volume, and the engine 23 and the transmission structure portion A are compact in the front-rear direction. It is summarized in.
[0044]
The engine 23 is an air-cooled gasoline engine provided with a wind guide casing 51 having a cooling air intake fan (not shown) driven by engine power on the right side. The cooling engine sent from the wind guide casing 51 is a cooling engine. The cylinder portion 23b is forcibly air-cooled by guiding the wind with the air guide cover 52 and supplying it around the cylinder portion 23b. Further, an exhaust pipe 54 that guides exhaust gas to the muffler 53 is connected to the left side of the cylinder portion 23b, and the vicinity of the root of the exhaust pipe 54 is cooled by the cooling air guided to the left side of the cylinder by the air guide cover 52. It has become. Further, the cooling air F led to the left side of the cylinder part 23 b flows backward and downward to cool the continuously variable transmission 30.
[0045]
A connecting bracket 61 is connected to the lower front end of the crankcase portion 23a. The connecting bracket 61 and a U-shaped support bracket 62 fixed to the front end of the front frame 22 form a vibration isolating rubber (vibration isolating material) 63. The anti-vibration support Bf at the front of the engine is configured.
[0046]
A horizontally long stay 64 having a sheet metal structure is connected and fixed to the lower side of the cylinder portion 23b that projects in an inclined posture toward the rear upper side. The stay 64 is a rigid member that is formed by welding a front plate 64a that goes up and down and a rear plate 64b that goes up and down, and a connecting arm 65 extending forward from the upper surface of the left side. In addition, the left side surface of the cylinder portion 23b is bolt-connected, and the right side surface of the cylinder portion 23b is bolt-connected to a connecting metal fitting 66 erected on the top surface of the stay 64 from the right side. The lower surface of the cylinder portion 23b is bolted to a connecting fitting 67 attached to the intermediate portion. In this way, the horizontally long stay 64 is firmly connected and fixed to the cylinder portion 23b in the horizontal orientation at the left and right side surfaces and the lower surface.
[0047]
Further, a support fitting 68 is fastened and fixed to a bolt connection portion at the front upper portion of the bolt connection portion connecting the continuously variable transmission 30 to the transmission case 21, and the left end of the stay 64 is fixed to the support fitting 68. Near the part is connected and supported via an anti-vibration rubber (anti-vibration material) 63. Further, a support fitting 69 is welded and fixed to the right side of the mounting seat 41 a of the handle post 41, and the right end of the stay 64 is attached to the support fitting 69 via an anti-vibration rubber (anti-vibration material) 63. Connected and supported. That is, a pair of left and right anti-vibration support portions Br for allowing the cylinder portion 23b to be anti-vibration supported with a large left-right spacing in the lateral direction on the support brackets 68 and 69 provided on the upper portion of the transmission structure portion A via a stay 64 as an intermediate member. Is configured.
[0048]
Here, as described above, on the left side of the cylinder portion 23b, there is a cooling air flow path for allowing the cooling air F to flow toward the continuously variable transmission 30, and the left side vibration-proof support that supports the cylinder portion 23b. The part Br is located in the cooling air flow path, and cools the vibration isolating rubber 63 that is easily heated by the heat from the cylinder part 23b and the heat from the exhaust pipe 54 and the like.
[0049]
[Another embodiment]
The present invention can also be implemented in the following forms.
[0050]
(1) The vibration isolating support portion Br for supporting the cylinder portion 23b may be provided only at one position on the lower side of the cylinder portion 23b, and the left and right anti-vibration support portions Bf at the lower front end of the crankcase portion 23a may be provided. . In this case, a structure in which a support fitting is fixed near the base of the handle post 41 as the vehicle body fixing portion that supports the cylinder portion 23b in an anti-vibration manner may be employed.
(2) As shown in FIG. 10, if the lower portion of the crankcase portion 23a is supported by the two anti-vibration support portions Bf and Bm at the front and rear, it is possible to mount the engine with a higher anti-vibration function.
(3) The present invention can also be applied to a work vehicle having a structure in which an engine is mounted on a rear portion of a vehicle body and a driver's seat is provided on a hood covering the engine.
[Brief description of the drawings]
[Fig. 1] Overall side view of the riding rice transplanter [Fig. 2] Overall plan view of the riding rice transplanter [Fig. 3] Front view of the riding rice transplanter [Fig. 4] Left side view of the front of the vehicle body [Fig. Left side view of [Fig. 6] Right side view of engine mounting portion [Fig. 7] Top view of engine mounting portion [Fig. 8] Front view of front anti-vibration support portion [Fig. 9] Perspective view of stay [Fig. ] Left side view of engine mounting part in another embodiment [Explanation of symbols]
23 Engine 23a Crankcase part 23b Cylinder part 23c Output shaft 24 Bonnet 28 Driver's seat 30a Input shaft 32 Belt transmission mechanism 63 Anti-vibration material (anti-vibration rubber)
64 stays A transmission structure Bf anti-vibration support Br Br anti-vibration support

Claims (8)

The engine is arranged in a state where the cylinder portion is inclined so that the cylinder portion protrudes obliquely upward with respect to the crankcase portion, and the weight of the engine is reduced between the lower portion of the crankcase portion and the cylinder portion via a vibration isolator. Anti-vibration support is provided for the vehicle body fixing part to be supported, and air cooling means for forcibly supplying cooling air around the cylinder part is provided, and the anti-vibration support part for the cylinder part is located in the cooling air flow path of the air cooling means. The engine mounting structure of the work vehicle characterized by this.   2. The engine mounting structure for a work vehicle according to claim 1, wherein the anti-vibration support portion of the crankcase portion is provided only at the end of the crankcase opposite to the cylinder portion extending direction.   A horizontally long stay is provided under the cylinder portion that is inclined to project, and the stay and the cylinder portion are connected at a plurality of locations in the longitudinal direction of the stay. The engine mounting structure for a work vehicle according to claim 1 or 2, wherein a support portion is provided. 4. The engine mounting structure for a work vehicle according to claim 3, wherein a pair of vibration isolating support portions for a vehicle body fixing portion provided in the vicinity of both ends of the stay are positioned outside a connecting portion between the stay and the cylinder portion.   The engine mounting structure for a work vehicle according to any one of claims 1 to 4, wherein a shift structure portion that receives engine power is inserted below the cylinder portion that is inclined to project.   6. The engine mounting structure for a work vehicle according to claim 5, wherein an engine output shaft horizontally supported on the crankcase portion and an input shaft horizontally supported on the transmission structure portion are interlocked and connected via a belt transmission mechanism.   The engine mounting structure for a work vehicle according to claim 6, wherein the cylinder portion is supported on an upper portion of the transmission structure portion via a vibration isolating material to constitute a vibration isolating support portion for the cylinder portion.   The engine mounting structure for a work vehicle according to any one of claims 1 to 7, wherein the engine is accommodated and deployed in a bonnet disposed in front of a driver's seat, and an inclined projecting direction of the cylinder portion is set to a rear upward direction. .

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