JP2610719B2 - Mobile cooling machine engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction in which power from an output shaft of an engine mounted on a traveling body is transmitted to a cooling fan of a radiator through a forward / reverse switching mechanism to remove dust adhering to a dustproof net. The present invention relates to an engine cooling device for a mobile agricultural machine that is configured to be able to periodically blow off and has a hydraulic drive mechanism for turning interposed in a traveling drive system of a traveling machine body.

[0002]

2. Description of the Related Art Conventionally, in an engine cooling device for a mobile agricultural machine, an electromagnetic clutch is interposed between an engine output shaft and a radiator cooling fan as disclosed in, for example, Japanese Utility Model Laid-Open No. 3-32122. A dust-blowing fan, which is driven by the electric motor in the direction opposite to the radiator cooling fan, and controls the electromagnetic clutch to be turned off and the electric motor to be turned on at the same time as the forward / reverse switching mechanism. was there.

[0003]

However, in the above-mentioned conventional structure, a dust blowing fan is required in addition to the radiator cooling fan, and an electric motor and its electric control mechanism are also required. In many cases, the structure is complicated and the cost is high. An object of the present invention is to solve the above disadvantages by rational structure improvement.

[0004]

A feature of the present invention is a hydraulic actuator for switching the forward / reverse switching mechanism from a rotation state of a fan for cooling a radiator to a reverse rotation state in the engine cooling device for a mobile agricultural machine described at the beginning. And is configured to supply pressure oil to the hydraulic actuator by branching off from a pressure oil supply path for the turning hydraulic braking mechanism.

[0005]

In operation of the airframe, when the turning braking mechanism is operated, for example, for headland turning in a field, the hydraulic actuator is actuated, and the cooling fan changes from the rotating state of the radiator cooling fan to the reverse rotation state. It switches, and the dust adhering to the dustproof net is blown outward. In addition, during a normal straight traveling operation, the cooling fan can effectively fulfill the cooling function of the radiator, and can blow off dust adhering during the periodic turning operation of the body. When the forward / reverse switching mechanism is configured to perform forward / reverse rotation by a reciprocally pressing action of the forward pulley and the reverse pulley against the transmission belt, the structure can be simplified, and noise and the like due to gear meshing can be eliminated. , And operate with low noise.

[0006]

Therefore, in this type of mobile agricultural machine, the cooling fan is rotated forward and backward by using the hydraulic power source of the hydraulic braking mechanism generally provided for turning with a small radius. In addition, it is possible to reliably blow out the attached dust regularly, and the structure can be simplified by eliminating the need for a fan dedicated to the blowing and a drive mechanism dedicated to the fan.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
Shows the prime mover of the combine. An engine 2 is mounted and supported on an airframe 1, and a driver's seat 4 is mounted and supported on an upper surface of a driving unit cover 3 that covers the engine 2, and an engine is provided on a lateral side and a rear side of the driving unit cover 3. An external air intake for cooling is formed. A cooling radiator 5 is provided at a location outside the body of the engine 2, and the radiator 5 is cooled by sucking outside air from the outside air suction portion by a fan 6 driven by the engine 2. That is, the radiator 5 is arranged at a position outside the body of the engine 1, and the fan 6 is arranged between the engine 2 and the radiator 5. Further, an intake duct 7 forming an outside air intake path connected to the intake portion of the radiator 5 is provided in a state extending across the lateral side and the rear side of the driving unit 8. In the intake duct 7, an outside air intake section 9 is formed on each of a side portion of the driving section 8, a side section of the driver's seat 4, and a rear section of the driving section 8. Is stretched out.

FIG. 1 shows a hydraulic circuit for turning the combine. In other words, in the combine, the clutch brake mechanisms 26, 26 (an example of a hydraulic brake mechanism) are interposed in the respective transmission systems for the pair of left and right crawler traveling devices CL, CL.
6 are driven by hydraulic cylinders 27R and 27L, respectively.
When the hydraulic piston 28 reaches the clutch release position,
Subsequent supply oil is a variable relief valve 2 for adjusting brake pressure.
9, and the switching control valve 31 of each of the hydraulic cylinders 27R and 27L and the variable relief valve 29 are connected to a single operating lever 32 disposed in the body control section. It is configured to be operated by. That is, when the operation lever 32 is operated from the neutral position N to the left or right, the hydraulic cylinders 27R, 2R in the operation direction are operated.
When the clutch 7L is actuated, the clutch is disengaged, and further operation is performed, the relief pressure of the variable relief valve 29 according to the operation amount changes, and a braking force corresponding to the operation amount is applied.

The power from the output shaft 11 of the engine 2 is transmitted to the radiator cooling fan 6 via the forward / reverse switching mechanism A. That is, as shown in FIG. 2, a first transmission belt 12 that is constantly driven to rotate by the output shaft 11 is stretched, and is separated from a state in which the first transmission belt 12 is pressed against the inner peripheral surface of the first transmission belt 12 and driven to rotate. Forward pulley 13 which can be switched between a state in which transmission is interrupted and transmission, and a reverse pulley 1 which is capable of switching between a state in which the transmission is interrupted by separating from a state in which the outer peripheral surface of the first transmission belt 12 is pressed against the outer peripheral surface and driven to rotate.
4 and a driven pulley 15 of the cooling fan 6, a second transmission belt 16 is wound and stretched, and the forward pulley 13 and the reverse pulley 14 are reciprocally switched to the transmission state. The forward / reverse switching mechanism A is freely provided. More specifically, the first transmission belt 12 is a drive pulley 1 attached to an engine output shaft 11.
7. Water pump 18 for circulating engine cooling water
The driven pulley 19 for the dynamo and the driven pulley 21 for the dynamo 20 are wound around each other, and the support shaft 22 of the cooling fan 6 is arranged on the same axis as the driven pulley 19 for the water pump. A pulley support member 24 is externally fitted to the fan support shaft 22 so as to be rotatable relative to the support shaft center, and the forward pulley 13 and the reverse pulley 14 are supported on the pulley support member 24.
A second transmission belt 16 is wound and stretched over each of the pulleys 13 and 14 and the driven pulley 15 of the cooling fan 6, and the forward pulley 13 and the reverse pulley 14 are configured in a double pulley structure. The one pulley portions 13a and 14a of the respective pulleys 13 and 14 are arranged at positions where they can be pressed against and separated from the first transmission belt 12.

The pulley support member 24 is provided with an operating arm 24a connected to the pulley support member 24 by means of a spring 25.
Is rotated in the direction in which it comes into pressure contact with the second transmission belt 16, and the forward rotation pulley 13 is driven by the hydraulic cylinder C (an example of a hydraulic actuator) that drives the operation arm 24a against the urging force of the spring 25. It is linked so as to be separated from the second transmission belt 16 and to switch to a state where the reverse rotation pulley 14 is pressed against the second transmission belt 16. Then, pressure oil is supplied to the hydraulic cylinder C from the drainage passage 30 for adjusting the traveling brake pressure. Therefore, the cooling fan 6 is configured to rotate in the reverse direction for every turning operation of the airframe, and to blow out the dust adhering to the radiator suction unit in accordance with the normal radiator cooling operation. The hydraulic oil supply passage for the hydraulic cylinder C is provided with a hydraulic pilot type switching valve 33 so that the hydraulic oil in the hydraulic cylinder C is discharged when the brake adjustment pressure decreases. The hydraulic cylinder C, which is spring-biased toward the retracting side, is automatically retracted with the discharge of the hydraulic oil, and is reset to the normal rotation state.

[Alternative Embodiment] As described above, the forward / reverse switching hydraulic cylinder C uses the hydraulic oil of a turning hydraulic braking mechanism dedicated to braking instead of the clutch brake mechanism 26 which also serves as a clutch mechanism. It may be something.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 Hydraulic system diagram

FIG. 2 is a side view of a main part showing a forward / reverse switching state.

FIG. 3 is a simplified front view of a forward / reverse switching mechanism.

FIG. 4 is a front view of a driving unit of the combine.

[Explanation of symbols]

 2 Engine 5 Radiator 6 Cooling fan 11 Output shaft 12 First transmission belt 13 Forward rotation pulley 14 Reverse rotation pulley 15 Follower pulley 16 Second transmission belt 26 Turning hydraulic braking mechanism A Forward / reverse switching mechanism C Hydraulic actuator

Claims (2)

(57) [Claims] 1. A forward / reverse switching mechanism (A) for switching power from an output shaft (11) of an engine (2) mounted on a traveling body.
And a cooling fan (6) of a radiator (5) through a hydraulic drive mechanism (26) in a traveling drive system of the traveling body. A hydraulic actuator (C) for switching the forward / reverse switching mechanism (A) from a radiator (5) cooling fan rotation state to a reverse rotation state, and supplying hydraulic oil to the turning hydraulic brake mechanism (26). An engine cooling device for a mobile agricultural machine configured to supply pressure oil to the hydraulic actuator (C) by branching off from a road. 2. A state in which a first transmission belt (12) constantly rotated and driven by the output shaft (11) is stretched, and the first transmission belt (12) is driven to rotate by being pressed against an inner peripheral surface of the first transmission belt (12). A forward pulley (13), which can be switched to a state in which the transmission is separated and separated, and a state in which the transmission is disconnected by pressing the outer peripheral surface of the first transmission belt (12) while being pressed against the outer peripheral surface of the first transmission belt (12); The second reverse pulley (14) extends freely over the respective pulleys (15) of the cooling fan (6).
The transmission belt (16) is wound and stretched, and the forward rotation pulley (13) and the reverse rotation pulley (14) are provided so as to be able to reciprocally switch to the transmission state, and the forward / reverse switching mechanism (A). The engine cooling device for a mobile agricultural machine according to claim 1, wherein: