JP2813655B2 - Forward / reverse switching structure of radiator fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator mounted on a working vehicle, and more particularly to a forward / reverse switching structure of a fan for guiding outside air for cooling to the radiator.

[0002]

2. Description of the Related Art An example of a forward / reverse switching structure of a radiator fan as described above is disclosed in Japanese Patent Laid-Open No. 5-52243. In this structure, a radiator fan (6 in FIG. 1 of the above-mentioned publication) that can freely rotate forward and backward is driven by a forward rotation power for driving the fan forward so that outside air is sucked through the radiator, and air flows in a reverse direction. As described above, a belt transmission system (12, 16, 24 in FIG. 1 of the above-mentioned publication) capable of selectively transmitting the reverse rotation power for driving the fan in the reverse direction is provided. (CY in FIG. 1 of the above-mentioned publication) which can be freely switched between a forward rotation state in which is transmitted and a reverse rotation state in which reverse rotation power is transmitted.
It has. With the above structure, in the normal state, the fan is driven forward to allow outside air to be sucked in through the radiator, and the fan is sometimes driven reversely to remove dust and the like adhering to the surface of the radiator and the dustproof net for the radiator. Blow it away.

In recent years, it has been proposed to use a switching operation actuator as described above to automatically and alternately switch a fan between a normal rotation state and a reverse rotation state at a predetermined cycle. . When the fan is in the reverse rotation state, dust attached to the surface of the radiator and the dustproof net for the radiator can be blown off.However, in this reverse rotation state, outside air is not guided to the radiator. Cooling efficiency is reduced. Therefore, when the fan is automatically and alternately switched between the normal rotation state and the reverse rotation state in a predetermined cycle, the time of the normal rotation state is set to a sufficient length in one cycle, and the reverse rotation time is slightly reduced. In general, the length is set to a suitable length.

[0004]

As described above, in the case where the normal rotation state for a sufficient time and the reverse rotation state for a short time are automatically repeated, for example, the normal rotation state is completed and the normal rotation state is completed. It is assumed that the engine is stopped immediately after the operation is switched to the run state. Then, when the engine is restarted in this state, the engine starts from the initial state of the normal rotation state (the state immediately after the reverse rotation state ends and the operation is switched to the normal rotation state),
The normal rotation state is held for a set sufficient length of time, and then the state is switched to the reverse rotation state.

[0005] In this case, when the engine is stopped and then left for a long time and then restarted, if the above-mentioned state is reached, while the engine is started and the normal rotation state is maintained, the engine is left idle. The fan is driven to rotate in a state where dust and the like adhered to the surface of the radiator and the dustproof net for the radiator as they are. As a result, the cooling efficiency of the radiator after the start operation of the engine is reduced. SUMMARY OF THE INVENTION It is an object of the present invention to provide a radiator fan forward / reverse switching structure in which the radiator has a high cooling efficiency after an engine start operation.

[0006]

The feature of the present invention resides in the following structure in the forward / reverse switching structure of the radiator fan as described above. In other words, the fan for the radiator is configured to be freely switchable between a normal rotation state in which the air is driven forward so that outside air is sucked through the radiator and a reverse rotation state in which the fan is driven reversely so that air flows in the opposite direction. An actuator that switches between a normal rotation state and a reverse rotation state, and a fan that is alternately switched between a normal rotation state and a reverse rotation state during operation of the engine.
First control means for operating the actuator, and when the engine is started from a stopped state, first, the actuator is kept in the reverse rotation state of the fan for a predetermined time prior to the first control means. Control means is provided.

[0007]

According to the present invention, the fan is automatically and alternately switched between the normal rotation state and the reverse rotation state by the first control means during the operation of the engine. In this state, if the engine is stopped and then the engine is started again, no matter what time the engine is stopped (for example, the reverse rotation state ends and the operation is switched to the normal rotation state). Even if the engine is stopped immediately after), the second control means causes the fan to rotate in the reverse direction for a predetermined time when the engine is started.

As a result, dust or the like adhering to the surface of the radiator or the dustproof net for the radiator during standing is blown off by the reverse rotation of the fan. Then, when the above-mentioned predetermined time has elapsed, the fan is automatically and alternately switched between the normal rotation state and the reverse rotation state by the first control means. Reversing the fan after starting the engine is disadvantageous in terms of cooling efficiency of the radiator itself.However, since the water temperature of the engine itself and the radiator has dropped during standing before the operation of starting the engine, Even if the fan is in the reverse rotation state for a predetermined time after the start operation, overheating does not occur.

[0009]

As described above, in the forward / reverse switching structure of the radiator fan, when the fan is automatically and alternately switched between the forward rotation state and the reverse rotation state, the surface of the radiator being left unattended. After removing dust and the like adhering to the dustproof net for radiators and radiators, it is possible to enter a state in which the fan is automatically switched alternately between a normal rotation state and a reverse rotation state. The cooling efficiency of the radiator was improved to prevent overheating.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a threshing device 2 is provided at the rear of the machine body supported by a pair of left and right crawler traveling devices 1, a mowing unit 3 is provided at a front portion of the machine body, and an operating unit 4 is provided at a rear right side of the mowing unit 3. They are arranged to form a combine for harvesting and harvesting grain. As shown in FIGS. 1 and 2, a cockpit 7 for the driving unit 4 is provided above the hood 6 that covers the engine 5.
A radiator 8 for the engine 5 and a fan 9 are arranged in the hood 6.

Next, the driving structure of the fan 9 for the radiator 8 will be described. As shown in FIGS. 11 and 3, a pulley 11 is attached to a rotating shaft 10 supported on a side surface of the engine 5.
Is fixed, the pulley 11, the output pulley 12 of the engine 5, and the input pulley 13 a of the alternator 13
, The first transmission belt 14 is wound. As shown in FIG. 3, a support arm 15a is swingably supported around a horizontal axis P3 of a case of the alternator 13, and a tension pulley 15 is provided at a tip of the support arm 15a. A spring 15b biasing the transmission belt 14 is connected. Thereby, the tension pulley 15 is constantly pressed against the outer surface of the first transmission belt 14.

A triangular switching member 16 having a flat plate shape is swingably supported on the rotating shaft 10. A pulley 17 for normal rotation in which two pulleys are stacked on the switching member 16 and a pulley 2
A reverse pulley 18 such as a stack is supported. A fan 9 is rotatably supported by a pulley 11 of the rotating shaft 10 by bearings. An input pulley 9a is formed at the base of the fan 9, and pulleys 17 and 18 for forward and reverse rotation of the input pulley 9a and the switching member 16 are provided. , The second transmission belt 19 is wound. As shown in FIGS. 9 and 12, a forward pulley 17 is supported on a support shaft 17a fixed to the switching member 16. On the other hand, the support shaft 18a of the reverse pulley 18 is
1 and the bracket 22, the long hole 16a of the switching member 16
Is supported so as to be freely adjustable along the axis, and the distance between the forward and reverse pulleys 17 and 18 can be finely adjusted.

With the above structure, the output pulley 12 and the first transmission belt 14 are constantly rotating in the direction of the arrow shown in FIG. Then, the switching member 16 is moved to the normal rotation position A shown in FIG.
When the swing operation is performed (corresponding to the forward rotation state), the forward rotation pulley 17 is pressed against the inner surface of the first transmission belt 14 from the right side in the drawing, and the power of the first transmission belt 14 is transmitted to the forward rotation pulley 17 and the second transmission belt 19. Is transmitted to the input pulley 9a as forward rotation power via the fan 9 and the input pulley 9a.
a is driven forward in the clockwise direction in FIG. In the state where the fan 9 is normally driven, the outside air is cooled by the suction action of the fan 9 as shown by a solid arrow in FIG.
And flows to the engine 5 side, and this state is a normal state.

Conversely, when the switching member 16 is swung to the reverse rotation position B (corresponding to the reverse rotation state) shown in FIG. 4, the reverse pulley 18 is pressed against the outer surface of the first transmission belt 14 from the left side in the drawing, and The power of the transmission belt 14 is the reverse pulley 1
8 and the input pulley 9 a via the second transmission belt 19.
The fan 9 and the input pulley 9a are reversely driven in a counterclockwise direction on the paper of FIG. In the state where the fan 9 is driven in the reverse direction, air flows in the opposite direction to that described above due to the blowing action of the fan 9 as indicated by the two-dot chain line arrow in FIG. 2, and the surface of the radiator 8 and the dustproof net 20 ( In particular, dust attached to the lower side) is blown away.

Next, the structure of the swing operation of the switching member 16 for the fan 9 will be described. As shown in FIGS. 9 and 11, a disc-shaped first take-up member 23 is rotatably supported around the axis P1 at a position different from the rotation shaft 10 of the switching member 16, and the first take-up member 23 is provided. 24 for rotating the motor
The switching member 16 is also fixed with a semi-disc-shaped second winding member 25. First winding member 2
The wire 26 connected to the third pin 23a is wound around the second winding member 25, and the support shaft 17a of the switching member 16 is wound.
And the pin 23a of the first winding member 23
A spring 27 is connected between the control member 16 and the switching member 16.

The state shown in FIG.
Is located at an angle corresponding to the forward rotation position A of the switching member 16, and the switching member 16 is swingably operated to the forward rotation position A by the pulling action of the spring 27, and the fan 9 is driven to rotate forward. (See FIG. 3). In this state, the wire 26 slightly sags, and the urging force of the spring 27 and the tension of the first transmission belt 14 are balanced. In this case, the spring 27 and the pin 23a are connected to the axis P1 of the first winding member 23.
, The first winding member 23 is being rotated clockwise by the urging force of the spring 27, but a stopper 29 is provided to stop the first winding member 23 at the angle shown in FIG. The first winding member 23 is held at the angle shown in FIG. 9 by the urging force of the spring 27 and the action of the stopper 29.

Next, when the first winding member 23 is rotated by about 180 ° counterclockwise by a motor 24, the wire 26 is pulled while being wound by the first winding member 23, and the switching member is turned. The second take-up member 16 and the second take-up member 25 also swing counterclockwise, and the switching member 16 is swung to the reverse rotation position B as shown in FIG.
Are driven in reverse rotation (see FIG. 4). As shown in FIGS. 9 and 10, the switching member 16 is moved from the normal rotation position A to the reverse rotation position B.
When the rocking operation is performed, the spring 2
7 is pulled to the switching member 16 side, and at the same time, the first winding member 23 to which the spring 27 is connected.
The pin 23a also moves toward the switching member 16 (about the length of the diameter of the first winding member 23), so that when the switching member 16 swings from the forward rotation position A to the reverse rotation position B, the spring 27
Is not a big resistance.

Conversely, when the first winding member 23 is positioned at an angle corresponding to the reverse rotation position B of the switching member 16 as shown in FIG. When the wire 26 is rotated by about 180 ° in the direction, the wire 26 is unwound from the first winding member 23, and the spring 27 is pulled by the movement of the pin 23a, and the switching member 16 and the second winding The member 25 also swings counterclockwise in the drawing, and the switching member 16 is swung to the normal rotation position A as shown in FIG.

Next, a cycle in which the switching member 16 is swung to the reverse rotation position B shown in FIGS. 4 and 10 will be described. In this cycle, as shown in FIG. 5, first, the switching member 16 is held at the normal rotation position A only for the set time T2,
Next, the switching member 16 is swung from the forward rotation position A to the reverse rotation position B over the set time T4, and no power flows to the fan 9 during this time. Then, the switching member 16 is held at the reverse rotation position B only for the set time T3,
The switching member 16 is swung from the reverse rotation position B to the normal rotation position A by multiplying the number 4, and one cycle of the cycle T1 is completed (the above corresponds to the first control means).

In the above cycle, the fan 9
1 is turned off once (see the neutral position in FIG. 5) from the state in which the radiator 8 is driven in the normal rotation direction, so that the radiator 8 is attached to the surface of the radiator 8 shown in FIG. Large dust and the like fall down between the radiator 8 and the dust-proof net 20 by the vibration of the body. Next, by driving the fan 9 in the reverse direction, dust and the like attached to the surface of the radiator 8 are blown off and dropped downward between the radiator 8 and the dust-proof net 20. Blow it away. As shown in FIG. 5, the switching member 16 moves from the normal rotation position A to the reverse rotation position B (or vice versa).
The set time T4 during which the swing operation is performed and the set time T3 during which the switching member 16 is held at the reverse rotation position B have substantially the same length, and the set time T2 during which the switching member 16 is maintained at the normal rotation position A is The time is set to be sufficiently longer than the set times T3 and T4.

Next, a description will be given of a control flow when the switching member 16 is swung to the reverse rotation position B in the cycle shown in FIG. 5 during normal work. As shown in FIGS. 6 and 7, during operation of the engine 5 (step S1),
When the threshing clutch (not shown) is operated to the on position (operation of the threshing device 2 in FIG. 1) (step S10), and the mowing is started by the mowing unit 3 shown in FIG.
(Step S11), the control is started.

When the control is started in this way, first, the switching member 16 is operated to swing to the normal rotation position A (step S).
12), a timer (not shown) starts counting (step S13), and the switching member 16 is held at the normal rotation position A until the set time T2 elapses (step S14). When the set time T2 has elapsed (step S1)
4) The switching member 16 is moved to the normal rotation position A over the set time T4.
Is rotated to the reverse rotation position B (step S15), and the timer starts counting again (step S1).
6) The switching member 16 is held at the reverse rotation position B until the set time T3 has elapsed (step S17). When the set time T3 has elapsed (step S17), step S17 is performed.
The process proceeds from step S1, step S10, and step S11 to step S12, where the switching member 16 is swung from the reverse rotation position B to the normal rotation position A over a set time T4, and one cycle is completed. Thus, the cycle of the cycle T1 shown in FIG. 5 is repeated.

Next, a description will be given of a case in which the engine 5 is started from a stopped state with respect to the above-described normal operation state. As shown in FIG. 9, a rotary potentiometer type position sensor 28 is fixed to the side surface of the engine 5, and a rubber roller 28 a is fixed to a rotary detection shaft of the position sensor 28. 28a
Is applied to the outer peripheral surface of the second winding member 25. Thereby, the switching member 16 and the second winding member 2
5 are continuously detected.

As shown in FIG. 6, the engine 5 is stopped once during the normal operation as described above (step S).
1) Assume that the engine 5 is subsequently started (step S2). In this case, if the switching member 16 is not located at the normal rotation position A (step S3), the switching member 16 is rocked to the normal rotation position A (step S4).
It is held at the normal rotation position A for a short set time T5 (step S5). If the switching member 16 is located at the normal rotation position A (step S3), the switching member 16 is left as it is.
Is held only during the short set time T5 (step S5).
5).

Next, the switching member 16 is swung to the reverse rotation position B (step S6), the timer starts counting (step S7), and the switching member 16 is moved to the reverse rotation position B for a slightly longer predetermined time T6. It is held (step S8).
When the predetermined time T6 has elapsed (step S8),
The switching member 16 is pivotally operated to the normal rotation position A (step S9), and the process proceeds to step S10 in FIG. 7 to enter a normal work state (corresponding to the second control means).

Next, a case where the threshing clutch is turned off during a normal operation will be described. As shown in FIG. 7, when the threshing clutch is turned off during normal work (step S10), the swing position of the switching member 16 is detected (step S18). In this case, in a state where the switching member 16 is located at the reverse rotation position B or in a state where the switching member 16 is swinging from the normal rotation position A to the reverse rotation position B, the switching member 16
Is once swung to the reverse rotation position B (step S19),
The rocking operation is again performed to the normal rotation position A (step S20),
It is held at the normal rotation position A (step S21).

The switching member 16 is moved from the reverse rotation position B to the normal rotation position A.
In the state where the swinging operation is being performed, the switching member 16 is operated to swing to the normal rotation position A as it is (step S20), and is held at the normal rotation position A (step S21). Next, in a state where the switching member 16 is located at the normal rotation position A, the switching member 16 is left at the normal rotation position A (step S2).
1). As described above, the switching member 16 is held at the normal rotation position A (step S21), and the switching member 16 is held at the normal rotation position A until the threshing clutch is engaged (step S22). Then, when the threshing clutch is operated again, the process shifts from step S22 to step S1 in FIG. 6 and returns to the normal operation state.

Next, a case will be described in which one harvesting process (a state during normal work) along one side of the field is completed, and the machine reaches the ridge. As shown in FIG. 7 and FIG. 8, when one cutting process is completed and the machine reaches the ridge, the stock switch of the cutting unit 3 does not detect the grain culm (step S11). When the stock switch no longer detects the grain stem, the swinging position of the switching member 16 is detected (step S23). If the switching member 16 is at a position other than the normal rotation position A, the switching member 16 The swing operation is performed to the normal rotation position A (step S24).

Next, the timer starts counting (step S25), and the switching member 16 is set until the set time T2 elapses.
Is held at the normal rotation position A (step S26), and when the set time T2 has elapsed (step S26), the set time T4
, The switching member 16 is pivoted from the forward rotation position A to the reverse rotation position B (step S27), the timer starts counting again (step S28), and the switching member 16 rotates reversely until the set time T3 elapses. It is held at position B (step S29).

When the set time T3 has elapsed (step S29), the switching member 16 is swung from the reverse rotation position B to the normal rotation position A and held there over the set time T4 (step S30). As described above, when one cutting process is completed and the aircraft reaches the ridge, the cycle of the cycle T1 shown in FIG. 5 is performed only once, and thereafter, the turning on the ridge is completed. The switching member 16 is held at the normal rotation position A until the next harvesting process is started (until the stock switch detects a grain culm) (step S31).

[Other Embodiment] In the structure shown in FIGS. 3 and 4, the forward and reverse rotation pulleys 17 and 18 are set to have opposite positions, and the forward rotation pulley 17 is pressed against the outer surface of the first transmission belt 14. As described above, the reverse pulley 18 may be configured to press against the inner surface of the first transmission belt 14.

In the claims, reference numerals are provided for convenience of 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 is an overall side view of a combine.

FIG. 2 is a longitudinal sectional front view of the vicinity of the hood of the combine.

FIG. 3 is a front view showing a state of a switching member and first and second transmission belts in a forward rotation state.

FIG. 4 is a front view showing the state of the switching member and the first and second transmission belts in a reverse rotation state;

FIG. 5 is a diagram showing a cycle in the swinging operation of the switching member.

FIG. 6 is a diagram showing a flow of the first half of control when operating the cycle shown in FIG. 5;

FIG. 7 is a diagram showing a middle flow of control when operating the cycle shown in FIG. 5;

FIG. 8 is a diagram showing a flow of the latter half of control when operating the cycle shown in FIG. 5;

FIG. 9 is a front view showing the state of the switching member and the first and second winding members in the normal rotation state;

FIG. 10 is a front view showing the state of the switching member and the first and second winding members in the reverse rotation state;

FIG. 11 is a longitudinal sectional side view showing the vicinity of a switching member and first and second winding members;

FIG. 12 is a cross-sectional view showing a support structure of the reverse pulley in the switching member.

[Explanation of symbols]

 5 Engine 8 Radiator 9 Fan 24 Actuator T6 Predetermined time A Forward rotation state B Reverse rotation state

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuka Hirata 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Shigeki Hayashi 64 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) F01P 5/04 F01P 7/04

Claims (1)

(57) [Claims] 1. A forward rotation state (A) in which a fan (9) for a radiator (8) is forwardly rotated so that outside air is sucked through the radiator (8), and a reverse rotation drive in which air flows in a reverse direction. An actuator (24) for switching the fan (9) between a normal rotation state (A) and a reverse rotation state (B), and an engine (5). A first actuation of the actuator (24) such that the fan (9) is alternately switched between a normal rotation state (A) and a reverse rotation state (B) during operation.
Control means, and when the engine (5) is started from a stopped state, first, the actuator (24) is put in the reverse rotation state of the fan (9) for a predetermined time (priority to the first control means). T6)
A forward / reverse switching structure for a radiator fan, comprising second control means for holding the fan only during the rotation.