JP3602003B2 - Power unit of paddy field machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a prime mover of a paddy field working machine such as a riding type rice transplanter in which a seedling planting device is connected to a self-propelled body.
[0002]
[Prior art]
[Prior art 1]
For example, as a rice transplanter in which a seedling planting device, which is a paddy field working device, is connected to the rear part of the self-propelled body, conventionally, an engine is mounted on the front part of the self-propelled body, as seen in JP-A-8-310266. A transmission case in which a transmission case is arranged at the rear and a hydrostatic continuously variable transmission is connected to the transmission case is known.
[0003]
[Prior art 2]
Conventionally, engine cooling exhaust air from the fan shroud attached to a radiator mounted on the radiator mounted adjacent to the engine in the longitudinal direction of the output shaft of the engine is used to exhaust the engine cooling exhaust air from the fan shroud. There was a baffle plate to guide around the part.
[0004]
[Problems to be solved by the invention]
However, the conventional technique has the following disadvantages.
[0005]
[Defects of Conventional Technique 1]
The weight of the rear paddy work equipment can be applied to the front of the self-propelled body using a heavy engine, so the front-rear balance of the body can be improved to some extent, but the front-rear balance is sufficiently good. In order to achieve this, it is necessary to arrange the engine forward or provide a heavy weight balance, and in the case of the former where the engine is arranged forward, the front-rear length of the self-propelled aircraft will increase accordingly. On the other hand, in the case of the latter in which a large weight balance weight is provided, the overall weight is increased.
[0006]
[Defects of Conventional Technique 2]
Gaps are formed between the fan shroud and the engine and between the engine and the air guide plate, and the engine cooling exhaust air escapes from these gaps. The exhaust part was overheated because the exhaust part could not be efficiently cooled without being able to sufficiently guide the exhaust part.
[0007]
An object of the present invention is to eliminate the above disadvantages.
[0008]
[Means for Solving the Problems]
The features, functions and effects of the present invention according to claim 1 are as follows.
[0009]
〔Characteristic〕
A paddy working device is connected to the rear part of a self-propelled body equipped with an engine in a state in which the output shaft is located in a left-right posture at a position forward of a transmission case supporting the front wheels, and the lateral side of the transmission case is The output shaft is connected to a hydrostatic stepless transmission having an input shaft interlocked via a wrapping transmission, and the muffler is laterally outward of the wrapping transmission on one lateral side of the engine , and A wind guide plate is provided in front of the front end of the hydrostatic continuously variable transmission to guide the engine cooling exhaust air flowing laterally to one side through the rear of the engine in the engine room. The point is that
[0010]
[Action]
In addition to the engine, the heavy transmission case and the hydrostatic continuously variable transmission are also located at the front, so that their weight is given to the front of the self-propelled body, improving the front-rear balance. In this case, the engine can be arranged rearward or the weight of the balance weight can be reduced as compared with the related art.
Moreover, the muffler is disposed laterally outward of the wrapping transmission on one lateral side of the engine and forward of the front end of the hydrostatic continuously variable transmission, and is passed through the rear of the engine into the engine room. A wind guide plate is provided to guide the engine cooling exhaust air flowing to one side to the lower side instead of the outer side, and to discharge it. Although the hydraulic continuously variable transmission is arranged, it is possible to suppress the heating of the hydrostatic continuously variable transmission and the atmosphere thereof due to engine cooling exhaust air.
[0011]
〔effect〕
Therefore, while achieving compactness and weight reduction in the front-rear direction, the front-rear balance can be improved, and the static-hydraulic continuously variable transmission is arranged near the engine room for this purpose. The performance of the hydraulic continuously variable transmission can be prevented from deteriorating due to exhaust heat from the engine.
[0012]
The features, functions and effects of the present invention according to claim 2 are as follows.
[0013]
〔Characteristic〕
The invention according to claim 1 is characterized in that a muffler is connected to an exhaust pipe for guiding exhaust gas to one lateral side outward through a rear portion of the engine in an engine room, in a state of discharging exhaust gas forward.
[0014]
[Action]
In order to improve the front-rear balance, a hydrostatic continuously variable transmission is arranged immediately behind one side of the engine room, and the muffler is arranged in front of it, but it is arranged so that exhaust is discharged forward. Therefore, it is possible to prevent the exhaust from the muffler from directly heating the hydrostatic stepless transmission and its atmosphere.
[0015]
〔effect〕
While adopting a configuration in which the hydrostatic continuously variable transmission is arranged near the muffler, the performance of the hydrostatic continuously variable transmission due to the exhaust heat can be suppressed.
[0016]
The features, functions and effects of the present invention according to claim 3 are as follows.
[0017]
〔Characteristic〕
In the invention according to claim 1 or 2, the engine is mounted via a vibration isolator, a radiator is mounted adjacent to the engine in a longitudinal direction of the output shaft of the engine, and a fan shroud is mounted on the radiator. The air guide plate is provided so as to guide the engine cooling exhaust air from the fan shroud around the exhaust portion of the engine, and closes the gap between the fan shroud and the engine and the gap between the air guide plate and the engine. The point is that an elastic sealing material is interposed.
[0018]
[Action]
By providing an air guide plate, the engine cooling exhaust air from the fan shroud is guided around the exhaust unit to cool the exhaust unit, and the gap between the fan shroud and the engine and the gap between the air guide plate and the engine are each Since it is closed by the elastic sealing material, it suppresses the leakage of the engine cooling exhaust air to the outside of the engine cooling exhaust air path around the exhaust section, and supplies a sufficient amount of engine cooling exhaust air around the exhaust section. be able to.
[0019]
〔effect〕
Therefore, the exhaust portion of the engine can be efficiently cooled by the engine cooling exhaust air, and the overheating of the exhaust portion can be prevented.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, a rice transplanter, which is an example of a paddy field working machine, is a riding type self-propelled body 3 having a pair of left and right driving front wheels 1 and a pair of left and right driving rear wheels 2. At the rear part, a multiple-row planting seedling planting device 4 which is an example of a paddy field working device is connected via a four-link mechanism 5 so as to be able to move up and down, and a hydraulic cylinder is used to drive the seedling planting device 4 up and down. The lifting cylinder 6 is provided and the fertilizer application device 7 is provided.
[0021]
As shown in FIGS. 3 and 4, the self-propelled body 3 includes a transmission case 9 that supports the driving front wheel 1 via a front axle case 8 and a rear axle case 10 that supports the driving rear wheel 2. A water-cooled engine 11 is mounted at a position near the front of the transmission case 9 of the fuselage frame with the output shaft 11a positioned sideways via a vibration isolating rubber 12 (an example of a vibration isolating material). In addition, a boarding operation unit 13 is mounted in a state located behind the engine 11. An engine mounting frame F on which the engine 11 is mounted via an anti-vibration rubber 12 is fixedly connected to the transmission case 9.
[0022]
The boarding driver 13 includes a steering handle 14 for steering the front wheels 1, a seat 15 located behind the steering wheel 14, and a driving step S. The operation step S is arranged at a level higher than the transmission case 9.
[0023]
In addition, on each of the left and right sides of the engine room R in which the engine 11 is installed, a getting-on / off passage L constituted by providing a getting-on / off step s connected to the operation step S is arranged. These getting-on / off passages L are used for, for example, getting on the boarding operation unit 13 from the front of the self-propelled body 3 and getting off from the boarding operation unit 13 to the front part of the self-propelled body 3.
[0024]
The seedling planting device 4 is provided with a seedling rest 16 which is driven to reciprocate at a set stroke in the left-right direction, and interlocks with the movement of the seedling rest 16 to vertically circulate between the seedling outlet and the field. By doing so, a plurality of planting mechanisms 17 for taking out seedlings on the seedling mounting table 16 by planting unit amount and planting the seedlings in the field are arranged at right and left intervals of the planting strip, and the field scene is slid with traveling. Has a well-known basic structure in which a plurality of ground floats 18 for leveling a field to be planted are arranged at right and left intervals.
[0025]
The fertilizer application device 7 has a fertilizer hopper 19 mounted on the self-propelled machine body 3, and has a feeding device 20 for feeding the fertilizer in the fertilizer hopper 19 by a set amount in conjunction with the planting operation. An electric fan 23 that forms a groove and supplies a fertilizer to be fed into the groove, and generates an air flow for pumping the fed fertilizer to the groove generator 21 through a hose 22. Is provided.
[0026]
As shown in FIGS. 3, 4, and 6, a lateral input shaft 41a that is wound around the output shaft 11a of the engine 11 and interlocks with the transmission case 40 via a transmission 40, as shown in FIGS. A continuously variable hydrostatic continuously variable transmission 41 having forward and backward switching is provided in a state where its output is transmitted to the transmission case 9 by a horizontal shaft, and its input shaft 41a and the horizontal output shaft 41b are moved back and forth. It is connected in a state to be arranged.
[0027]
The wrapping transmission device 40 is provided with a tension pulley 40d that winds a transmission belt 40c around an output pulley 40a attached to the output shaft 11a and an input pulley 40b attached to the input shaft 41a, and applies tension to the transmission belt 40b. It is configured.
[0028]
The input shaft 41a of the hydrostatic continuously variable transmission 41 extends to the other side through the front portion of the transmission case 9, and the input shaft 41a is provided with an input pulley 40b as a mounting portion. A variable speed cooling fan f for generating wind for cooling the stepped transmission is mounted.
[0029]
As shown in FIGS. 4 and 6, a hydraulic pump 42 driven by an extended end of an input shaft 41a of the hydrostatic continuously variable transmission 41 is provided on the left, right, lateral and other side surfaces of the transmission case 9. As shown in FIGS. 3, 4, and 6, a torque generator 43 for hydraulic power steering interlocking with a handle shaft 14a of the steering handle 14 is provided on an upper surface of the transmission case 9; 6 is mounted with a hydraulic control valve 44 for raising and lowering the working device for controlling the operation device 6.
[0030]
When the hydraulic system is described in detail, as shown in FIG. 6, the transmission case 9 is used as a hydraulic oil tank, and the hydraulic oil in the transmission case 9 is passed through an oil filter 45 attached to the other lateral side of the transmission case 9. The hydraulic oil is supplied to the hydrostatic stepless transmission 41 and the hydraulic pump 42, and the hydraulic oil from the hydraulic pump 42 is supplied to the torque generator 43, and then to the lifting cylinder 6 through the hydraulic control valve 44. ing. Then, the drain of the hydrostatic continuously variable transmission 41 is returned to the front axle case 8 communicating with the transmission case 9, and the drain of the hydraulic control valve 44 when the operation of the elevating cylinder 6 is stopped is returned to the transmission case 9. It is supposed to be.
[0031]
In the transmission case 9, a clutch for interrupting the power from the hydrostatic continuously variable transmission 41, a gearshift type auxiliary transmission for shifting the output from the clutch in two stages of high and low, and A differential mechanism for transmitting an output to the drive front wheel 1 is installed as a transmission element of a traveling transmission system from the engine 11 to a traveling section, and a one-way clutch for transmitting only forward rotation of the input of the auxiliary transmission, A planting transmission for changing between plants to which the output of the direction clutch is input, and a planting clutch for interrupting the output of the planting transmission are planted in the seedling planting device 4 branched from the traveling transmission system. Installed as a transmission element of the transmission system. The front axle case 8 contains a transmission mechanism from the differential mechanism to the drive front wheel 1, and the rear axle case 10 controls the rotation of the differential case taken out from the differential mechanism via a shaft by driving the rear wheel 2. A transmission mechanism for transmitting power to the vehicle is provided.
[0032]
As shown in FIGS. 1 and 3, the engine room R has an upper surface inclined forward and downward, and a cover 50 that covers the upper surface, front and rear surfaces, and left and right side surfaces of the engine room R An upper cover portion 51 covers an upper portion, a rear cover portion 52 covers a lower portion of the lower portion of the engine room R, and a front cover portion 53 covers a front portion of the lower portion of the engine room R.
[0033]
As shown in FIG. 3, the upper cover portion 51 is attached to a stay 54 connected to a handle post 14A that supports the steering handle 14, and has an instrument panel portion.
[0034]
The rear cover portion 52 is attached to the body frame at the lower portion, and is attached to the left and right ends of the attachment frame TF at the front portion via attachment stays 55 at the front portion as shown in FIGS. 3, 4, and 8. ing. The mounting frame TF is mounted on a base B for supporting the handle post 14A on the torque generator 43.
[0035]
As shown in FIGS. 3, 4, 8, and 10, the front cover portion 53 is provided with a U-shaped hinge to the mounting stay 55 so as to be swingable up and down around a left-right axis P at the upper rear end. The cover portion K is attached via the member 56. The hinge member 56 is installed in the engine room R. That is, the fulcrum 57 that supports the front cover 53 so as to be able to swing up and down around the left-right axis P is composed of the hinge member 56 and the support shaft 58 that constitutes the left-right axis P. It is installed in the room R.
[0036]
As shown in FIGS. 1 to 3 and 10, the front cover 53, that is, a means for holding the cover K in the open position, has a rod-like shape in front of the self-propelled body 3, that is, in front of the engine room R. The rear sighting tool 59 is tilted to support the front cover 53 in the open position by locking the running sighting tool 59 in the upright aiming operation position and the locking portion Ka formed on the front cover 53 in the open position at the upper end. This means is provided so as to be capable of swinging switching between the tension action posture and the swing operation posture.
[0037]
The front cover 53 is made of a synthetic resin, and a lamp house 60A of a headlamp 60 is integrally formed on the front cover 53 as shown in FIG. The headlight 60 includes a lamp house 60A, a lamp assembly 60B having a light bulb attached thereto, and a lamp house 60A fitted with a lens 60C. The inner surface of the lamp house 60A has a high reflectance. A layer 60a is formed. Means for forming the reflective layer 60a include a means for attaching a reflective sheet or a reflective film having a surface formed of a reflective layer to the inner surface of the lamp house 60A, and a means for applying a reflective material to the inner surface of the lamp house 60A. .
[0038]
Further, on the left and right side surfaces of the front cover portion 53, that is, on the side surface opposite to the hydrostatic continuously variable transmission 41, as shown in FIG. A suction port 61 for sucking the air is formed.
[0039]
The rear end of the front cover 53 elastically contacts the outer surface of the front end of the rear cover 52 when the front cover 53 is swung to the closed position.
[0040]
As shown in FIGS. 3, 4, and 7, an input shaft 63a is provided around the output shaft 11a of the engine 11 and interlocked with the output shaft 11a via the transmission 62, in the engine room R. Generator 63 is arranged.
The wrapping transmission device 62 is configured by winding a transmission belt 62c over an output pulley 62a mounted to rotate integrally with the output shaft 11a and an input pulley 62b mounted to rotate integrally with the input shaft 63a. ing.
The generator 63 is attached to a generator frame 64 fixedly mounted on the engine 11 so as to swing and fix freely around a horizontal axis x so as to swing the input shaft 63a in a direction in which the tension of the transmission belt 62c is changed. Thus, the tension of the transmission belt 62c is adjusted by swinging around the left-right axis x. Specifically, it is attached to the generator frame 64 with two bolts 65 and 66, and the bolt insertion hole 67 of the generator frame 64 through which one bolt 65 is inserted is formed into an arc-shaped long hole around the other bolt 66. With this arrangement, the swinging is performed around the left-right axis x with the other bolt 66 as a fulcrum, and the swing is fixed by tightening one bolt 65.
[0041]
As shown in FIGS. 4 and 5, a radiator 68 directs the suction port to the left, right, left and other sides and the discharge port to the left and right sides of the engine room R at positions adjacent to the engine 11 adjacent to the engine 11. It is arranged in a posture facing one side. The radiator 68 is mounted on an engine mounting frame F via a stay 69. The radiator 68 is provided with a cooling fan 70 which is driven by the engine 11 via a fan belt while being located between the radiator 68 and the engine 11. A fan shroud 71 covering the outer periphery of the fan is mounted.
[0042]
As shown in FIG. 3 to FIG. 5, the engine cooling exhaust air from the fan shroud 71 is exhausted to an exhaust manifold 11 </ b> A (an example of an exhaust portion) at the rear of the engine 11 in an upper portion of the engine room R above the rear of the engine 11. A) a U-shaped three-dimensionally structured air guide plate that guides the surroundings and guides the engine cooling exhaust air that has flowed to the right and left and one side after passing through the location; .
As shown in FIGS. 3 to 5, a sponge-based elastic sealing member 73 that closes a gap between the fan shroud 71 and the engine 11 is attached to the fan shroud 71, and the air guide plate 72 and the engine 11 An elastic sealing member 74 using a sponge for closing a gap between the air guide plate 72 and the air guide plate 72 is provided.
[0043]
As shown in FIGS. 3 to 5, a muffler 76 discharges the exhaust gas forward to an exhaust pipe 75 which is connected to the exhaust manifold 11 </ b> A and guides the exhaust gas to the left and right and one side outward through the rear portion of the engine 11. Connected to state. The exhaust port 76a of the muffler 76 is open forward and downward.
[0044]
As shown in FIG. 4, a push-pull type operation cock 78 for opening and closing the fuel cock is inserted through the rear cover portion 52 of the cover 50. The operation rod 78 has an operation ring portion 78a formed by bending an outer end portion thereof.
As shown in FIG. 9, the rod installation hole 79 of the rear cover portion 52 through which the operation rod 78 is inserted is formed in a size that allows the operation ring portion 78a to be inserted. Is a length allowing the insertion of the operation ring 78a, that is, a length L1 larger than the diameter D of the operation ring 78a, and a width for elastically holding the operation rod 78, that is, the width of the operation rod 78. A rubber rod holder 80 having a slit 80a having a width L2 slightly smaller than the diameter d is elastically fitted and held.
[0045]
[Another embodiment]
INDUSTRIAL APPLICATION This invention can be applied to paddy field working machines other than a rice transplanter.
[Brief description of the drawings]
FIG. 1 is a side view. FIG. 2 is a plan view. FIG. 3 is a side view of a driving unit. FIG. 4 is a plan view of a driving unit. FIG. 5 is a rear view of a driving unit. FIG. 6 is a schematic plan view of a driving unit. FIG. 7 is a side view of a main part of a driving part. FIG. 8 is a cutaway rear view of a cover attaching section. FIG. 9 is a rear view of an operation rod insertion section. FIG. 10 is a cutaway side view of a cover opened state. Longitudinal side view of main part (front part) of front cover
DESCRIPTION OF SYMBOLS 1 Front wheel 3 Self-propelled body 4 Paddy field working device 9 Transmission case 11 Engine 11a Output shaft 11A Exhaust part 40 Winding transmission 41a Input shaft 41 Hydrostatic stepless transmission 50 Cover 51 Upper cover part 52 Back cover part 53 Front cover Part 57 fulcrum part 59 traveling sight 60 headlight 60A lamp house 62 wrapping transmission device 63a input shaft 63 generator 68 radiator 71 fan shroud 72 air guide plate 73 elastic sealing material 74 elastic sealing material 75 exhaust pipe 76 muffler 78 operation Rod 78a Operation ring part 79 Rod installation hole 80a Slit 80 Rod holder R Engine room L Passage for getting on and off P Right and left axis core K Cover part Ka Locking part

Claims (3)

Paddy work on the rear part of a self-propelled body (3) equipped with an engine (11) in front of a transmission case (9) supporting the front wheels (1) with its output shaft (11a) positioned in a horizontal position. Device (4) coupled to the transmission case (9) and provided on one lateral side with an input shaft (41a) that is wound around the output shaft (11a) and interlocks via a transmission (40). A continuously variable transmission (41) is connected, and the muffler (76) is laterally outward of the wrapping transmission (40) on one lateral side of the engine (11) and the hydrostatic continuously variable transmission. A wind guide plate disposed in front of the front end of the device (41) and for guiding the engine cooling exhaust air flowing laterally through the rear of the engine (11) downward in the engine room (R). engine section of paddy working machine are set only 72). The muffler (76) is connected to an exhaust pipe (75) for guiding exhaust gas to one side outward through a rear portion of the engine (11) in the engine room (R) so as to discharge exhaust gas forward. 2. The driving section of the paddy field working machine according to 1. The engine (11) is mounted via a vibration isolator (12), and a radiator (68) is mounted adjacent to the engine (11) in the longitudinal direction of the output shaft (11a) of the engine (11). A fan shroud (71) is attached to the radiator (68), and the wind guide plate (72) is provided so as to guide the engine cooling exhaust air from the fan shroud (71) around the exhaust portion of the engine (11). An elastic seal member (73) (74) for closing a gap between the fan shroud (71) and the engine (11) and a gap between the air guide plate (72) and the engine (11). The prime mover of the paddy field working machine according to 1 or 2.

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