JP4897455B2 - Mower - Google Patents

Description

  The present invention relates to a mower having an engine and a transmission device having a pair of hydraulic continuously variable transmission units that transmit the output of the engine separately to a pair of left and right traveling wheels.

In the above-described mower, there has been a conventional one described in Patent Document 1, for example, as a cooling device for a pair of hydraulic continuously variable transmission units.
The mower described in Patent Document 1 includes an engine provided at the rear of the vehicle body and a mission case provided in front of the engine. The transmission case corresponds to a transmission device having a pair of hydraulic continuously variable transmissions that separately transmit engine output to a pair of left and right traveling wheels. That is, the transmission case includes a center case to which engine power is input, and a rear axle case connected to the left and right sides of the center case. The center case includes an input case portion and HSTs incorporated in the left and right sides of the input case portion, and distributes the power input to the input shaft to the left and right HSTs. The rear axle case transmits the output of HST to the rear wheels.
In addition, an HST cooling fan provided on the input shaft of the center case and a guide plate located behind the HST cooling fan are provided. The HST cooling fan cools the left and right HSTs. The guide plate sucks the HST cooling fan from the space below the engine.

JP 2000-351330 A (paragraphs [0028], [0032], FIGS. 3, 4 and 5)

  A cooling fan driven by the power transmitted from the engine to the transmission is provided, and when the above-described conventional technology is used to cool the hydraulic continuously variable transmission using this cooling fan, the cooling fan and the transmission are provided with cut grass. In some cases, adhesion or entanglement occurred. In other words, if the cut grass remains on the ground or in the vicinity due to poor collection or work form, the cooling fan sucks cooling air from below the engine, so the cut grass is sucked together with the cooling air. It becomes easy.

  An object of the present invention is to cool a hydraulic continuously variable transmission by a cooling fan driven by power transmitted from an engine to a transmission device, and further to improve cooling performance by employing an oil cooler. An object of the present invention is to provide a mower that can easily avoid the problem of attachment and entanglement of cut grass.

The first aspect of the present invention is a mower equipped with an engine and a transmission device having a pair of hydraulic continuously variable transmissions for transmitting the output of the engine to a pair of left and right traveling wheels separately in the longitudinal direction of the vehicle body.
A cooling fan provided integrally with a rotating shaft that links the engine and the transmission device is housed in a fan case, and air is sucked into the cooling fan from an intake port that opens upward of the vehicle body above the cooling fan. A partition wall for providing an air duct to the engine side, and providing a ventilation port for a transmission unit for supplying cooling air from the cooling fan to the pair of hydraulic continuously variable transmission units. A material is provided between the fan case and the engine,
The intake duct is set to have a longer vertical dimension than the front-rear dimension. Inside the intake duct, the hydraulic oil of the hydraulic continuously variable transmission is supplied by cooling air supplied to the cooling fan. An oil cooler is provided for cooling.

According to the configuration of the first aspect of the invention, the cooling fan is driven by the rotating shaft that links the engine and the transmission, and sucks air from the intake port of the intake duct to generate the cooling wind, and the cooling wind is changed in the fan case. The air is supplied to the pair of hydraulic continuously variable transmission parts from the part air outlet. Since the air intake port opens above the cooling fan in the upward direction of the vehicle body, even if there is cut grass remaining or scattered on the ground or in the vicinity, the cooling fan is in a state where it is difficult to suck the cut grass with the air. Air is sucked to generate cooling air. Since the oil cooler of the transmission is arranged in the intake duct that communicates the intake port with the cooling fan, the oil cooler receives the cooling action by the flowing air generated by the suction by the cooling fan, The transmission device is cooled by receiving a cooling action in a state in which a decrease in heat exchange efficiency due to entanglement is unlikely to occur.
As a result, the cooling fan is driven by the power transmitted from the engine to the transmission, and an oil cooler is used to cool the hydraulic continuously variable transmission, while cooling regardless of the remaining or scattered grass. The fan, the transmission device, and the oil cooler are less likely to be blown by the cut grass and the heat exchange efficiency is reduced, and a state where the transmission device can be cooled satisfactorily can be easily obtained without much effort for removing the cut grass.

According to a second aspect of the present invention, in the configuration of the first aspect of the invention, the oil cooler includes a bent pipe material, and the longitudinal direction of the pipe material is set in the vertical direction.

According to the configuration of the second invention, the cooling air can be sent along the longitudinal direction of the pipe material inside the intake duct.

According to a third aspect of the present invention, in the configuration of the second aspect of the invention, the pipe material of the oil cooler extends above the cooling fan.

According to the configuration of the third aspect of the invention, the hydraulic oil can be cooled by the pipe material extending above the cooling fan.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects of the present invention, an engine cooling fan that supplies cooling air to the engine is provided coaxially with the cooling fan.

According to the fourth aspect of the present invention, the cooling fan and the engine cooling fan are both driven by the driving force of the engine, and the cooling air from the engine cooling fan is supplied to the engine to cool the engine.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects of the present invention, the fan case has a vertical wall shape at a position close to the pair of hydraulic stepless transmission units with respect to the cooling fan. The wall plate is provided with a pair of transmission ports for supplying cooling air to the pair of hydraulic stepless transmission units.

According to the fifth aspect of the present invention, the pair of hydraulic continuously variable transmission portions can be cooled by supplying the cooling air to the pair of hydraulic continuously variable transmission portions from the pair of transmission portion blowing ports formed in the wall plate.

According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects of the present invention, an oil filter to which hydraulic oil of the hydraulic continuously variable transmission unit is supplied is disposed below the fan case, The fan case has a side wall portion that covers the periphery of the cooling fan, and a filter air outlet that supplies a part of the cooling air from the fan case to the oil filter is provided in the side wall portion.

According to the sixth aspect of the invention, cooling can be performed by supplying the cooling air from the filter air vent provided in the side wall portion of the fan case to the oil filter.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a mower according to an embodiment of the present invention. As shown in this figure, the mower according to the present embodiment includes a pair of left and right caster-wheel free-running front traveling wheels 1 and 1 (hereinafter referred to as front wheels 1) and a pair of left and right driveable rear wheels. A self-propelled vehicle that is self-propelled by traveling wheels 2 and 2 (hereinafter referred to as rear wheels 2), and a mowing device 10 that is connected via a link mechanism 4 between front and rear wheels of a body frame 3 of the self-propelled vehicle. And.

  This mower is used to cut grass and grass. That is, the link mechanism 4 includes a pair of left and right front swing links 4 a and 4 a connected across the body frame 3 and the front end side of the cutting blade housing 11 of the mowing device 10, and the body frame 3 and the cutting blade housing 11. A pair of left and right rear swing links 4b, 4b connected to the rear end side, an interlocking link 4c connected to the left front swing link 4a and the rear swing link 4b, and a right front swing link 4a. And an interlocking link 4c connected to the rear swing link 4b. The pair of left and right rear swing links 4b and 4b are configured to rotate integrally with the rotary shaft 5 and a rotary shaft 5 which is laterally connected to the vehicle body frame 3 so that both rear swing links 4b are rotatably connected to the vehicle body frame 3. The lift cylinder 7 is interlocked with the provided operation arm 6.

  As a result, the link mechanism 4 is swung up and down with respect to the vehicle body frame 3 by the swinging operation of the operation arm 6 by the lifting linder 7, and the mowing device 10 is moved to both the front part and the rear part of the cutting blade housing 11. The raising / lowering operation is performed between a descending work state in which the gauge wheel 12 provided on the side is in contact with the ground and a rising work state in which the gauge wheels 12 are lifted from the ground. If the self-propelled vehicle is driven with the mowing apparatus 10 in the descending work state, the mowing apparatus 10 operates as follows. That is, a plurality of cutting blades 13 arranged in the horizontal direction of the vehicle body inside the cutting blade housing 11 are rotationally driven around the vertical axis of the cutting blade spindle about the vehicle body, and each mowing blade 13 performs lawn mowing and mowing processing. Do. The cut grass and cut grass are transported inside the cutting blade housing 11 to a discharge port (not shown) located on the lateral end side of the cutting blade housing 11 by the conveying wind generated by the rotation of each cutting blade 13. It discharges to the outside of the cutting blade housing 11 from the discharge port.

Next, the self-propelled vehicle will be described in detail.
As shown in FIGS. 1, 2, 3, and 4, the vehicle body frame 3 includes an upper portion connected to a pair of left and right main frames 3a and 3a facing the vehicle body and an intermediate portion between the pair of left and right main frames 3a and 3a. And a frame 3b. As shown in FIG. 1, the self-propelled vehicle includes the pair of left and right front wheels 1 and 1 and the pair of left and right rear wheels 2 and 2, and also has a driver seat 21 supported by the upper frame 3 b. And the overturn protection frame 22 positioned near the rear side of the driver seat 21 and the driving unit 30 having the engine 31 supported by the rear end portions of the pair of left and right main frames 3a and 3a. ing.

  As shown in FIG. 1, the driving unit 20 includes the driving seat 21, the driving unit floor 23 supported on the front portion of the pair of left and right main frames 3 a, 3 a, and both sides of the driving seat 21. And a pair of left and right control levers 24, 24 arranged side by side.

  FIG. 2 is a vertical side view of the prime mover 30. As shown in this figure, the driving unit 30 includes the engine 31 and a transmission device 40 arranged and supported on the rear side of the pair of left and right main frames 3a and 3a on the front side of the vehicle body of the engine 31. A cooling device 50 disposed between the transmission device 40 and the engine 31, an engine bonnet 33 covering the engine 31 and the upper portion of the cooling device 50, and a shield disposed near the front side of the vehicle body of the engine 31. And a hot wall material 34.

  The engine bonnet 33 swings up and down up and down around the vehicle body lateral axis of the connecting shaft 8b connected to the support member 8a fixed to the rear bumper 8 at the rear end thereof. The engine bonnet 33 is provided with a bonnet intake port 33a provided with punching metal attached to the rear end side of the both horizontal plate portions, the rear end side of the top plate portion, and the front plate portion.

  As shown in FIGS. 2 and 4, the engine 31 includes a cooling air introduction port 35 provided in the heat shielding wall member 34, and an engine cooling fan 36 located slightly rearward of the vehicle body from the cooling air introduction port 35. It has. The engine cooling fan 36 is supported on an output shaft 31a of the engine 31 so as to be integrally rotatable. The cooling air inlet 35 has a circular shape that is concentric with the output shaft 31a of the engine 31 when viewed in the longitudinal direction of the vehicle body. The cooling air inlet 35 includes a rotary dust remover 37. That is, the engine 31 rotationally drives the engine cooling fan 36 by the driving force of the output shaft 31a, and the engine cooling fan 36 bonnets the engine bonnet inside 33b located in front of the heat shield wall material 34. Air flowing in from the air inlet 33a is sucked into the fan case 36a from the cooling air inlet 35 to generate cooling air, and this cooling air is supplied to the engine 31 to cool the engine.

  The engine 31 is an air-cooled engine. The bonnet intake port 33a removes the air flowing into the engine bonnet interior 33b with a punching metal. The cooling air inlet 35 removes the air sucked into the fan case 36 a by the rotary dust remover 37. The rotary dust remover 37 is connected to the rear end side of the rotary shaft 38 that interlocks the output shaft 31 a of the engine 31 with the input shaft 41 of the transmission device 40 so as to be integrally rotatable, and from the engine 31 to the transmission device 40. The dust that is rotationally driven by the transmission power and adheres to the dust removal surface of the rotary dust remover 37 is removed by rotation. The heat shield wall member 34 includes a cylindrical air inlet 34a. The intake port 34 a is connected to an engine air cleaner 39, and supplies air inside the engine bonnet 33 b to the air cleaner 39.

  FIG. 2 shows a state of the transmission device 40 in a side view. FIG. 3 shows a state of the transmission device 40 in a rear view. FIG. 4 shows a state of the transmission device 40 in plan view. As shown in these drawings, the transmission device 40 includes a branch transmission unit 42 having the input shaft 41, a hydraulic continuously variable transmission unit 43 provided on both sides of the branch transmission unit 42, The rear rear axle case 44 for the left rear wheel connected to the left hydraulic continuously variable transmission 43 and the rear axle case 44 for the right rear wheel connected to the right hydraulic continuously variable transmission 43. And. That is, the transmission device 40 inputs the output from the output shaft 31a of the engine 31 to the input shaft 41 via the rotary shaft 38, and the driving force of the input shaft 41 is applied to the left rear wheel by the branch transmission unit 42. The driving force branched to the right rear wheel and the driving force branched to the left rear wheel is transmitted to the left rear wheel 2 by the left hydraulic continuously variable transmission 43 and the rear axle case 44 for the right rear wheel. The branched driving force is transmitted to the right rear wheel 2 by the right hydraulic continuously variable transmission 43 and the rear axle case 44.

  The left and right hydraulic continuously variable transmissions 43 are hydrostatic continuously variable transmissions. The left hydraulic stepless speed changer 43 is shifted by the left control lever 24 of the driving unit 20 and switches the left rear wheel 2 between the forward side and the reverse side. Drive in a stepless manner or stop operation. The right hydraulic stepless transmission unit 43 is shifted by the right control lever 24 of the driving unit 20, and the right rear wheel 2 is switched between the forward side and the reverse side, so that both the forward side and the reverse side are switched. Also, the gear is continuously shifted and stopped or stopped.

  In other words, the pair of left and right hydraulic continuously variable transmissions 43, 43 are individually operated by a pair of left and right control levers 24, 24, and the pair of left and right rear wheels 2, 2 are switched between the forward side and the reverse side separately. To drive or stop the gear, to drive the self-propelled vehicle to shift forward or backward, or to stop it, and to steer the self-propelled vehicle to go straight or turn . The transmission device 40 includes an output shaft 45 that protrudes forward from the branch transmission portion 42 toward the vehicle body. The drive force of the input shaft 41 is also branched for work by the branch transmission portion 42, and the drive force for this work is supplied. The power is transmitted from the output shaft 45 to the input shaft of the mowing apparatus 10 via the rotation shaft 46 (see FIG. 1).

  FIG. 2 shows a state of the cooling device 50 in a longitudinal side view. FIG. 3 shows a state of the cooling device 50 in a longitudinal rear view. FIG. 4 shows a state of the cooling device 50 in a cross-sectional plan view. As shown in these drawings, the cooling device 50 includes a cooling fan 51 provided in an intermediate portion of the rotating shaft 38 so as to be integrally rotatable, a fan case 52 containing the cooling fan 51, and a fan case 52. Between the intake duct 53 to which the lower duct portion 53 a is connected, the oil cooler 54 disposed inside the upper duct portion 53 b of the intake duct 53, and the cooling air introduction port 35 of the fan case 52 and the engine 31. The partition wall member 55 is provided.

  5 is a cross-sectional view taken along line VV in FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a perspective view of the lower part of the cooling device 50. As shown in FIGS. 2, 3, and 4, the fan case 52 includes a fan case body 52 </ b> A having a side wall 52 a that covers the periphery of the cooling fan 51, and a front side of the fan case body 52 </ b> A. The front wall board 56 connected is comprised. The fan case main body 52 </ b> A includes the side wall portion 52 a and a rear wall portion 52 b that covers the rear side of the vehicle body of the cooling fan 51. The fan case 52 is supported by the upper frame 3b by connecting the front wall plate 56 to the pair of left and right upper frames 3b. The fan case 52 includes a rotation shaft hole 60 provided so that the rotation shaft 38 is inserted into the rear wall portion 52 b, an intake hole 61 provided in the front wall plate 56, and a cooling fan 51 provided in the front wall plate 56. A pair of left and right transmission air blowing ports 62, 62 provided in a distributed manner on both sides of the lower part, and a filter air blowing port provided on the side wall part 52a on one lateral side below the cooling fan 51. 63.

  The intake hole 61 is a hole through which the rotary shaft 38 is inserted. The pair of left and right transmission unit air vents 62, 62 are open toward the front of the vehicle body, and the left transmission unit air port 62 faces the left hydraulic continuously variable transmission unit 43 and the right transmission unit air flow. The port 62 faces the right hydraulic continuously variable transmission 43. The filter air outlet 63 opens toward the lower side of the vehicle body, and faces the oil filter 57 provided in the transmission device 40 so as to protrude from the branch transmission portion 42 toward the rear of the vehicle body.

  As shown in FIG. 2-7, the intake duct 53 includes the lower duct portion 53a and the upper duct portion 53b communicating with the upper end side of the lower duct portion 53a on the lower end side. is there. The lower duct portion 53 a includes the front wall plate 56 and a lower duct body attached to the front surface side of the front wall plate 56 and communicates with the intake hole 61 of the fan case 52. Thus, the intake duct 53 is formed by opening the intake port 64 in the engine bonnet interior 33b and above the cooling fan 51 upward of the vehicle body by the upper end portion of the upper duct portion 53b. The cooling fan 51 is communicated.

  As shown in FIG. 2, the intake duct 53 is in an arrangement state in which the lower duct portion 53a and a part of the upper duct portion 53b protrude from the cooling fan 51 to the side where the transmission device 40 is located, The pair of left and right transmission unit air blowing ports 62 and 62 are separated from the corresponding hydraulic stepless transmission unit 43 toward the vehicle body side.

  The oil cooler 54 is constituted by a pipe material bent as shown in FIGS. The oil cooler 54 and the oil filter 57 are supplied into the case of the transmission device 40 for lubrication of the transmission device 40 and as hydraulic oil for the pair of left and right hydraulic continuously variable transmissions 43 and 43. It is connected to the transmission 40 so as to cool and remove the lubricating oil.

  As shown in FIGS. 2, 4, 5, and 7, the partition wall member 55 includes a front wall member 55a along the rear wall portion 52b of the fan case 52, and a front wall member 55a on both sides of the front wall member 55a. A horizontal wall member 55b connected across the horizontal end portion of the wall member 55a and the heat shield wall member 34, and forming a flow path for allowing the air inside the engine bonnet 33b to flow to the cooling air inlet 35; The fan case 52 and the cooling air inlet 35 are partitioned.

  Thereby, the cooling device 50 cools the transmission device 40 as follows. That is, the cooling fan 51 is rotationally driven by the rotating shaft 38 that transmits the output of the engine 31 to the transmission device 40. Then, the cooling fan 51 sucks into the intake duct 53 and sucks the air that has flowed into the engine hood inside 33b from the outside of the engine hood 33 into the intake duct 53 from the intake port 64, and the lower duct portion 53a of the intake duct 53. Into the fan case 52. At this time, the air flowing through the upper duct portion 53b of the intake duct 53 is caused to exchange heat with the oil cooler 54, and the oil cooler 54 is allowed to cool the lubricating oil.

  The cooling fan 51 generates cooling air as it is sucked into the fan case 52, and the cooling air is sent from the fan case 52 toward the transmission device 40 through the left transmission unit air outlet 62, and is then sent to the left side. The hydraulic continuously variable transmission unit 43 is supplied to the right transmission unit blower port 62 and sent from the fan case 52 toward the transmission device 40 to be supplied to the right hydraulic continuously variable transmission unit 43. The continuously variable transmission units 43 and 43 are cooled. At this time, each transmission unit air outlet 62 diffuses the sent cooling air between the transmission unit air outlet 62 and the hydraulic continuously variable transmission unit 43 and disperses it in a wide range of the hydraulic continuously variable transmission unit 43. Supply.

  Further, the cooling fan 51 sends cooling air from the fan case 52 downward to the vehicle body through the filter air outlet 63 and supplies the cooling air to the oil filter 57, which causes the oil filter 57 to cool the lubricating oil. At this time, even if the temperature of the fan case 52 rises due to the air that has risen in temperature due to heat exchange with the oil cooler 54, this causes the engine cooling air sucked into the cooling air inlet 35 to rise in temperature. This is suppressed by the partition wall material 55.

Overall side view of mower Longitudinal side view of the prime mover Rear view of the cooling device Plan view of cooling device installation section VV cross-sectional arrow view of FIG. VI-VI cross-sectional view of FIG. Perspective view of the lower part of the cooling device

Explanation of symbols

2 Traveling Wheel 31 Engine 35 Cooling Air Inlet 38 Rotating Shaft 40 Transmission Device 43 Hydraulic Stepless Transmission 51 Cooling Fan 52 Fan Case 53 Intake Duct 54 Oil Cooler 55 Partition Wall Material 57 Oil Filter 62 Transmission Port Blower 63 Filter Vent 64 for air intake

Claims (6)

A mowing machine comprising an engine and a transmission device having a pair of hydraulic continuously variable transmissions for transmitting the output of the engine to a pair of left and right traveling wheels separately in the longitudinal direction of the vehicle body,
A cooling fan provided integrally with a rotating shaft that links the engine and the transmission device is housed in a fan case, and air is sucked into the cooling fan from an intake port that opens upward of the vehicle body above the cooling fan. A partition wall for providing an air duct to the engine side, and providing a ventilation port for a transmission unit for supplying cooling air from the cooling fan to the pair of hydraulic continuously variable transmission units. A material is provided between the fan case and the engine,
The intake duct is set to have a longer vertical dimension than the front-rear dimension. Inside the intake duct, the hydraulic oil of the hydraulic continuously variable transmission is supplied by cooling air supplied to the cooling fan. A mower with an oil cooler for cooling . The mower according to claim 1 , wherein the oil cooler includes a bent pipe material, and a longitudinal direction of the pipe material is set in a vertical direction . The mower according to claim 2, wherein the pipe material of the oil cooler extends above the cooling fan . The mower according to any one of claims 1 to 3, wherein an engine cooling fan that supplies cooling air to the engine is provided coaxially with the cooling fan . A vertical wall-shaped wall plate is disposed at a position near the pair of the hydraulic continuously variable transmission portions with respect to the cooling fan, and the pair of hydraulic continuously variable transmission portions with respect to the wall plate. The mowing machine according to any one of claims 1 to 4, wherein a pair of gearboxes for the transmission unit for supplying cooling air to the fan are formed . An oil filter to which hydraulic oil of the hydraulic continuously variable transmission unit is supplied is disposed below the fan case, and the fan case has a side wall portion that covers the periphery of the cooling fan. The mowing machine according to any one of claims 1 to 5, wherein a filter blower port for supplying a part of the cooling air to the oil filter is provided in the side wall portion .

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