JP2012126337A - Traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working vehicle improving a heat balance of a hydraulic fluid in a transmission case 17, while simplifying a hydraulic piping structure of an oil cooler 45.SOLUTION: The working vehicle includes a machine body frame 16 for connecting the transmission case 17 to an engine 5, and the oil cooler 45 and a cooling fan 46 for cooling the hydraulic fluid in the transmission case 17. The oil cooler 45 is provided between the engine 5 and the transmission case 17 by installing the oil cooler 45 in the machine body frame 16.

Description

  The present invention relates to a traveling vehicle such as a tractor used for agricultural work or a wheel loader used for civil engineering work.

  Conventionally, in a traveling vehicle such as a tractor, an engine and a transmission case are connected by a fuselage frame to form a traveling vehicle body, and the driving wheel is supported close to the upper surface of the transmission case equipped with a rear wheel, A technique is known that includes an oil cooler that cools hydraulic oil in a transmission case, and that arranges a radiator and an oil cooler on the front side of the engine (see, for example, Patent Document 1).

JP-A-8-72746

  In the structure in which the oil cooler is provided on the front side of the engine as in Patent Document 1, the oil cooler is disposed in the front part of the traveling machine body, and the transmission case is disposed in the rear part of the traveling machine body. It is necessary to extend long hydraulic piping. In addition, since the oil cooler is close to the engine and the radiator, the oil cooler is likely to be insufficiently cooled during farm work in high-temperature areas. That is, there are problems that the hydraulic piping structure of the oil cooler cannot be simplified and the heat balance of the hydraulic oil in the transmission case cannot be improved.

  Accordingly, the present invention seeks to provide a traveling vehicle that has been improved by examining these current conditions.

  The invention according to claim 1 is a traveling vehicle including a machine body frame that couples a transmission case to an engine, an oil cooler that cools hydraulic oil in the transmission case, and a cooling fan. The oil cooler is attached to the machine frame, The oil cooler is arranged between the engine and the transmission case.

  According to a second aspect of the present invention, in the traveling vehicle according to the first aspect, the cooling fan is disposed on a transmission shaft that transmits the output of the engine to the transmission case, and the cooling fan wind is supplied to the oil cooler. It is comprised as follows.

  According to a third aspect of the present invention, in the traveling vehicle according to the first aspect, a cooling air duct is provided in the airframe frame, the oil cooler is disposed in the cooling air duct, and the oil cooler is viewed from the left and right of the airframe in a front view. It is configured to be supported by being inclined in the width direction.

  According to a fourth aspect of the present invention, in the traveling vehicle according to the first aspect, the cooling air of the oil cooler is supplied from the upper side of the body frame toward the oil cooler, while the cooling air is supplied to the lower side of the body frame. This cooling air is discharged from the oil cooler.

  According to a fifth aspect of the present invention, in the traveling vehicle according to the first aspect, the driver's seat floor is provided on the traveling body including the fuselage frame, and the floor mat laid on the upper surface of the driver's seat floor is insulated and soundproofed. It is made of a material, and an air guide path is provided in the floor mat, and the cooling air from the oil cooler is taken in by the cooling fan from the air guide path.

  According to a sixth aspect of the present invention, in the traveling vehicle according to the first aspect, cooling fans are respectively disposed on both the output shaft of the engine and the input shaft of the transmission case, and cooling air is supplied from each of the cooling fans to the oil cooler. Are configured to be supplied simultaneously.

  According to the invention of claim 1, in a traveling vehicle comprising a machine body frame that couples a transmission case to an engine, an oil cooler that cools hydraulic oil in the mission case, and a cooling fan, the oil cooler is attached to the machine frame, Since the oil cooler is configured to be disposed between the engine and the transmission case, the transmission case and the transmission case are compared with the prior art in which the oil cooler is provided adjacent to the engine cooling radiator. The hydraulic piping between the oil coolers can be formed in a short length. Further, the oil cooler can be arranged separately from the engine or radiator, and the oil cooler can be independently provided outside the hood in which the engine or radiator is installed. Cooling air can be taken in efficiently. That is, the heat balance of the hydraulic oil in the transmission case can be improved while the hydraulic piping structure of the oil cooler can be simplified.

  According to the invention of claim 2, the cooling fan is disposed on a transmission shaft that transmits the output of the engine to the transmission case, and the cooling fan wind is supplied to the oil cooler. The cooling fan can be driven without specially providing a transmission mechanism for the cooling fan, and the drive structure and support structure of the cooling fan can be easily configured.

  According to the invention of claim 3, the airframe is provided with a cooling air duct, the oil cooler is disposed in the cooling air duct, and the oil cooler is inclined and supported in the left-right width direction of the airframe in a front view. Therefore, the cooling air duct can be easily assembled using the highly rigid body frame. By inclining the oil cooler when viewed from the front of the machine body, for example, the oil cooler whose height is higher than the vertical width dimension of the machine body frame can be compactly supported within the vertical width of the machine body frame. The oil cooler can be assembled in a compact manner by effectively utilizing the airframe space between the engine and the transmission case.

  According to the invention of claim 4, while supplying the cooling air of the oil cooler from the upper side of the body frame toward the oil cooler, the cooling air is discharged from the oil cooler toward the lower side of the body frame. Therefore, it is possible to prevent the hot air from being discharged to the operator side, and at the same time, to prevent the dust or muddy water of the farm scene from being taken into the oil cooler side, thereby cooling the oil cooler. Efficiency can be easily maintained.

  According to the invention of claim 5, a structure is provided in which a driver's seat floor is provided on a traveling machine body including the fuselage frame, wherein a floor mat laid on an upper surface of the driver's seat floor is formed of a heat insulating and soundproof material, and the floor mat is provided. Since the cooling fan is configured to take in the cooling air of the oil cooler from the air guiding path, the operation of the cooling fan can be reduced while reducing the noise of the cooling fan. The outside air on the upper surface of the seat floor can be taken in by the cooling fan, and dust or muddy water in the field can be prevented from adhering to the oil cooler, and the cooling efficiency of the oil cooler can be easily maintained.

  According to a sixth aspect of the present invention, cooling fans are arranged on both the output shaft of the engine and the input shaft of the transmission case, and cooling air is supplied simultaneously from the cooling fans to the oil cooler. Therefore, it is possible to easily obtain the cooling air volume required for the oil cooler by adding the air volumes of the cooling fan on the output shaft side of the engine and the cooling fan on the input shaft side of the transmission case. Compared to a structure in which the oil cooler is cooled by a single cooling fan, each of the cooling fans can be reduced in size, and driving noise of the cooling fan can be reduced.

It is a side view of the agricultural tractor as a traveling vehicle which shows 1st Embodiment. It is the same top view. It is an enlarged side view of the principal part. It is an enlarged plan view of the principal part. It is an expanded sectional rear view of the principal part.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, drawings when an embodiment of the present invention is applied to a farm tractor as a traveling vehicle will be described. 1 is a side view of the tractor, FIG. 2 is a plan view of the tractor, and FIGS. 3 to 5 are enlarged views of main parts. In the following description, the left side in the forward direction of the aircraft is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side.

  As shown in FIGS. 1 and 2, a tractor 1 as a traveling vehicle supports a traveling machine body 2 with a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 and is mounted on a front portion of the traveling machine body 2. By driving the rear wheel 4 and the front wheel 3 with the engine 5, the vehicle 5 is configured to travel forward and backward. The engine 5 is covered with a bonnet 6. Further, a driver's seat floor 7 is installed on the upper surface of the traveling machine body 2, and on the rear side of the bonnet 6, a driver's seat 8 and a steering handle 9 that moves the front wheels 3 to the left and right by steering. Is installed. A lops frame 10 that protects the operator is provided on the outer side of the driver seat 8.

  The traveling machine body 2 includes a left and right machine body frame 16 having a front bumper frame 12 and a front axle case 13. A mission case 17 is connected to the rear portion of the body frame 16 for transmitting the rotation of the engine 5 to the rear wheels 4 and the front wheels 3 with appropriate speed change. In this case, the rear wheel 4 is attached to the transmission case 17 via a rear axle case 18 mounted so as to protrude outward from the outer surface of the transmission case 17.

  A seat frame 20 is attached to the upper surface of the transmission case 17 by bolt fastening. A link mechanism 23 having a lower link 21 and a top link 22 is provided. A link mechanism 23 is provided at the rear part of the transmission case 17, and a working machine (not shown) such as a tiller is connected to the lower case 21 and the top link 22 so as to be movable up and down. Further, a PTO shaft 24 that transmits power to a working machine such as a tiller is provided on the rear side surface of the mission case 17 so as to protrude rearward.

  Further, a power transmission shaft 25 having a universal shaft joint extends from the rear surface of the engine 5 toward the front surface of the transmission case 17. The rotational output of the engine 5 is transmitted to the transmission case 17, and then the transmission output of the transmission case 17 is transmitted to the rear wheel 4 via a differential gear mechanism (not shown). Further, the transmission output of the transmission case 17 is configured to be transmitted to the front wheel 3 via the front wheel drive shaft 26.

  In the present embodiment, the steering handle 9 is disposed on the steering column 31 protruding from the driver seat floor 7 in front of the driver seat 8. A shift pedal 33 is disposed on the right side of the steering column 31. A work implement elevating lever 35 is disposed on the right fender 34 portion on the right side of the driver seat 8, and a traveling speed change lever 37 and a PTO speed change lever 38 are disposed on the left fender 36 portion on the left side of the driver seat 8. The base end portion of the lift arm 64 is pivotally supported on the upper surface of the rear portion of the transmission case 17 so as to be rotatable. The lower link 21 is connected to the tip of the lift arm 64 via a lift rod 65.

  Further, a hydraulic lift cylinder 66 is provided on the rear surface portion of the transmission case 17, and the hydraulic lift cylinder 66 is connected to an intermediate portion of the lift arm 64. The hydraulic lift cylinder 66 is operated by operating the working machine lifting / lowering lever 35 to move the lower link 21 up and down, and to raise and lower a working machine (not shown) such as a tillage working machine connected to the lower link 21 and the top link 22. The working machine is configured to be supported at an arbitrary height.

  Next, with reference to FIGS. 3 to 5, the mounting structure of the oil cooler 45 and the like will be described. As shown in FIGS. 3 to 5, the engine output shaft 41 protrudes rearward from the rear surface portion of the engine 5, and the rear end side of the power transmission shaft 25 is connected to the engine output shaft 41. A hydraulic continuously variable transmission 42 is provided on the front surface of the transmission case 17, and a rear end side of the power transmission shaft 25 is connected to a pump input shaft 43 of the hydraulic continuously variable transmission 42 having a pair of hydraulic pumps and a hydraulic motor. Yes. The hydraulic oil in the transmission case 17 is supplied to the hydraulic continuously variable transmission 42 via the oil filter 44, the oil cooler 45, and the like, and the output of the engine 5 is continuously shifted and transmitted to the transmission case 17. In addition, the hydraulic oil in the transmission case is cooled by the oil cooler 45.

  As shown in FIGS. 3 to 5, a sirocco fan type cooling fan 46 fixed on the engine output shaft 41 and a fan case 47 in which the cooling fan 46 is provided are provided. A fan case 47 is fastened to the rear surface of the engine 5. One end side of the outside air duct 49 is connected to the suction port 48 of the fan case 47. Further, a floor mat 50 laid on the upper surface of the driver's seat floor 7 is formed of a heat insulating and soundproof material, and a number of groove-like air guide paths 51 are provided on the bottom surface side of the floor mat 50. A front opening of the groove-shaped air guide path 51 is connected to the outside air duct 49 via a connector 52, and a fan case 47 is formed from the lower side of the driver's seat 8 (the height of the traveling machine body 2) via the rear opening of the air guide path 51. The outside air is taken in by the cooling fan 46.

  A cooling air duct 55 is provided on the inner surface of the right body frame 16. One end side of the cooling air duct 55 is connected to the exhaust port 56 of the fan case 47. An oil cooler 45 is installed on the other end side of the cooling air duct 55. Between the engine 5 and the transmission case 17, the oil cooler 45 is fixed to the inner surface of the right body frame 16 via the fastening body 57. As shown in FIG. 5, the oil cooler 45 is supported by being inclined in the left-right width direction of the airframe when viewed from the back (front view). That is, the oil cooler 45 is obliquely installed inside the cooling air duct 55 so that the space between the right body frame 16 and the oil cooler 45 is larger than the space between the right body frame 16 and the oil cooler 45. Yes.

  As shown in FIG. 5, while supplying the cooling air of the cooling air duct 55 from the upper side of the airframe frame 16 toward the oil cooler 45 supported in the tilted posture, the cooling air duct opened toward the lower side of the airframe frame 16. The cooling air is discharged from 55 cooling air outlets 58. The oil cooler 45 is obliquely installed inside the cooling air duct 55 so that the distance between the right body frame 16 and the oil cooler 45 is smaller than the distance between the right body frame 16 and the oil cooler 45. There is no need to go into detail.

  With the above configuration, the cooling fan 46 is driven by operating the engine 5. When the cooling fan 46 is rotated, outside air on the upper surface side of the driver's seat floor 7 is taken in from the air guide path 51 of the floor mat 50 by the cooling fan 46, and the oil cooler is passed from the cooling fan 46 through the cooling air duct 55. Cooling air is supplied toward 45. That is, the cooling air of the cooling fan 46 is supplied from the upper side of the body frame 16 toward the oil cooler 45, while the cooling air is discharged from the oil cooler 45 toward the lower side of the body frame 16, and the transmission case 17. The hydraulic oil temperature inside is maintained below a predetermined temperature.

  Further, as described above, the cooling fan 46 is provided on the engine output shaft 41. However, as shown in FIG. 4, the cooling fan 46a is also provided on the pump input shaft 43, and the cooling fan 46a is provided in the fan case 47a. The cooling air is supplied from the cooling fan 46a to the oil cooler 45 through the cooling air duct 55a. That is, the cooling fans 46 and 46a are arranged on both the engine output shaft 41 and the pump input shaft 43 of the transmission case 17, and cooling air is simultaneously supplied from the cooling fans 46 and 46a to the oil cooler 45. The airflow of the cooling fan 46 on the side of the shaft 41 and the airflow of the cooling fan 46a on the side of the pump input shaft 43 are added to obtain the amount of cooling air necessary for the oil cooler 45. Further, when the cooling fan 46a is provided on the pump input shaft 43, the hydraulic continuously variable transmission 42 is air-cooled by the ventilation action of the cooling fan 46a sucking the cooling air, and the temperature rise of the hydraulic continuously variable transmission 42 is reduced. Thus, the speed change efficiency of the hydraulic continuously variable transmission 42 can be improved.

  As shown in FIGS. 1 and 3 to 5, in a traveling vehicle including a body frame 16 that couples a mission case 17 to an engine 5, an oil cooler 45 that cools hydraulic oil in the mission case 17, and a cooling fan 46, Since the oil cooler 45 is attached to the frame 16 and the oil cooler 45 is disposed between the engine 5 and the transmission case 17, the oil cooler 45 is provided adjacent to the radiator for cooling the engine 5. Compared to the technology, the hydraulic piping between the mission case 17 and the oil cooler 45 can be formed in a short length. In addition, the oil cooler 45 can be disposed separately from the engine 5 or the radiator, and the oil cooler 45 can be independently provided outside the hood 6 in which the engine 5 or the radiator is installed. Cooling air can be taken in efficiently. That is, the heat balance of the hydraulic oil in the mission case 17 can be improved while the hydraulic piping structure of the oil cooler 45 can be simplified.

  As shown in FIGS. 3 to 5, a cooling fan 46 is disposed on an engine output shaft 41 as a transmission shaft that transmits the output of the engine 5 to the transmission case 17, and the cooling fan 46 wind is supplied to the oil cooler 45. Since it is configured, the cooling fan 46 can be driven without specially providing a transmission mechanism for the cooling fan 46, and the drive structure and support structure of the cooling fan 46 can be easily configured.

  As shown in FIGS. 3 to 5, a cooling air duct 55 is provided in the airframe frame 16, an oil cooler 45 is disposed in the cooling air duct 55, and the oil cooler 45 is supported by being inclined in the left-right width direction of the airframe in front view. Thus, the cooling air duct 55 can be easily assembled using the highly rigid body frame 16. By inclining the oil cooler 45 when viewed from the front of the machine body, for example, even the oil cooler 45 whose height is higher than the vertical width dimension of the machine body frame 16 can be compactly supported within the vertical width of the machine body frame 16. The oil cooler 45 can be assembled in a compact manner by effectively utilizing the space between the engine 5 and the transmission case 17.

  As shown in FIGS. 3 to 5, the cooling air of the oil cooler 45 is supplied to the oil cooler 45 from the upper side of the body frame 16, while the oil cooler 45 is discharged to the lower side of the body frame 16. Thus, the hot air can be prevented from being discharged from the cooling air discharge port 58 of the cooling air duct 55 toward the operator side. Further, the cooling wind exhausted downward from the cooling air discharge port 58 can prevent the dust or muddy water in the field from entering the discharge port 58, and the dust or muddy water in the field scene is taken into the oil cooler 45 side. Can be prevented. The cooling efficiency of the oil cooler 45 can be easily maintained.

  As shown in FIGS. 3 to 5, the driver's seat floor 7 is provided on the traveling vehicle body 2 including the vehicle body frame 16, and a floor mat 50 laid on the upper surface of the driver's seat floor 7 is formed of a heat insulating and soundproof material. Since the floor mat 50 is provided with the air guide path 51 and the cooling air of the oil cooler 45 is taken in by the cooling fan 46 from the air guide path 51, the noise of the cooling fan 46 can be reduced. However, the outside air on the upper surface of the driver's seat floor 7 can be taken in by the cooling fan 46, so that dust or muddy water in the field can be prevented from adhering to the oil cooler 45, and the cooling efficiency of the oil cooler 45 is simplified. Can be maintained.

  As shown in FIG. 4, cooling fans 46 and 46a are arranged on both the output shaft 41 of the engine 5 and the input shaft 43 of the transmission case 17, respectively, and cooling air is simultaneously supplied from the cooling fans 46 and 46a to the oil cooler 45. Therefore, the amount of cooling air necessary for the oil cooler 45 is added by adding the air volume of the cooling fan 46 on the output shaft 41 side of the engine 5 and the cooling fan 46a on the input shaft 43 side of the transmission case 17. Can be easily obtained. Compared to the structure in which the oil cooler 45 is cooled by a single cooling fan, each cooling fan 46, 46a can be reduced in size, and the driving noise of the cooling fans 46, 46a can be reduced.

2 Driving body 5 Engine 7 Driver's seat floor 16 Airframe frame 17 Mission case 41 Engine output shaft (transmission shaft)
43 Pump input shaft 45 Oil cooler 46 Cooling fan 50 Floor mat 51 Grooved air duct 55 Cooling air duct

Claims (6)

In a traveling vehicle comprising a fuselage frame that connects a transmission case to an engine, an oil cooler that cools hydraulic oil in the transmission case, and a cooling fan,
A traveling vehicle, wherein the oil cooler is attached to the body frame, and the oil cooler is arranged between the engine and the transmission case.   The traveling vehicle according to claim 1, wherein the cooling fan is arranged on a transmission shaft that transmits the output of the engine to the transmission case, and the cooling fan wind is supplied to the oil cooler. .   The airframe is provided with a cooling air duct, the oil cooler is disposed in the cooling air duct, and the oil cooler is supported by being inclined in the left-right width direction of the airframe when viewed from the front. The traveling vehicle according to claim 1.   The cooling air of the oil cooler is supplied from the upper side of the body frame toward the oil cooler, and the cooling air is discharged from the oil cooler toward the lower side of the body frame. The traveling vehicle according to claim 1.   A structure in which a driver's seat floor is provided on a traveling machine body including the fuselage frame, and a floor mat laid on an upper surface of the driver's seat floor is formed of a heat insulating and soundproof material, and an air guide path is provided in the floor mat, The traveling vehicle according to claim 1, wherein the cooling air of the oil cooler is taken in by the cooling fan from a wind guide path. The cooling fan is arranged on each of the output shaft of the engine and the input shaft of the transmission case, and cooling air is simultaneously supplied from the cooling fans to the oil cooler. The traveling vehicle described.

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