JPH07224653A - Normal reverse rotation switching structure of fan for radiator - Google Patents

Abstract

PURPOSE:To make anything unusual accurately detectable in the case where a selector member for normal and reverse rotations is remotely controlled by an actuator and an interlocking member, in this reversibly selecting structure of a fan for a radiator made up of being capable of selecting both normal and reverse rotations of this radiator fan owing to a belt tension construction. CONSTITUTION:This selecting structure is provided with a first detecting means 29 detecting an operating position of an actuator 24 and a second detecting means 28 detecting an operating position of a selector member 16, and in this constitution, on the basis of each detected value of both these first and second detecting means 29 and 28, a warning is emitted in the case where both these operating positions of the actuator 24 and the selector member 16 are not conformed to each other.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An example of a forward / reverse switching structure for a fan for a radiator as described above is disclosed in Japanese Utility Model Laid-Open No. 4-100038. In this structure, the fan for the radiator (6 in FIG. 1 and FIG. 3 of the above publication) which can rotate forward and backward is
A belt drive system capable of selectively transmitting a normal rotation power that drives the fan in the normal direction so that the outside air is drawn in through the radiator and a reverse rotation power that drives the fan in the reverse direction so that the air flows in the opposite direction ( 12, 13, 1 in FIG. 1 of the above publication
4 and 16), and the belt transmission system is switchable between a forward rotation position to which the forward rotation power is transmitted and a reverse rotation position to which the reverse rotation power is transmitted (see FIG. 1 of the above publication).
24) inside.

With the above structure, in a normal state, the fan is driven in the normal direction so that the outside air is sucked through the radiator, and the fan is driven in the reverse direction at every set time, and the surface of the radiator and the dustproof mesh for the radiator are driven. The dust and the like adhering to is blown off. Further, in this structure, when the switching member for the belt transmission system of the fan is operated to the forward rotation position and the reverse rotation position, the switching member is provided with a wire (2 in FIG.
6) (corresponding to an interlocking member) is connected, and the switching member is operated to the forward rotation position and the reverse rotation position by pushing and pulling the wire.

[0004]

In recent years, an actuator is provided at a position distant from the switching member, the other end of the wire is connected to the actuator, and the wire is pushed and pulled by the actuator to switch the switching member. It has been proposed to remotely control the forward and reverse positions. According to the present invention, in a forward / reverse switching structure for a fan for a radiator, when the switching member can be remotely operated to a forward rotation position and a reverse rotation position by an actuator, various abnormalities can be accurately detected. Has an aim.

[0005]

The feature of the present invention resides in the following structure in the forward / reverse switching structure of the fan for radiator as described above. In other words, the fan for the radiator, which can rotate forward and backward freely, uses the forward rotation power to drive the fan forward by the forward rotation pulley so that the outside air is sucked in through the radiator, and the backward rotation pulley so that the air flows in the reverse direction. With a belt drive system that can selectively transmit reverse power for reverse rotation, the forward rotation pulley is operated to the transmission position and the reverse rotation pulley is operated to the transmission interruption position to transmit the normal rotation power. And the reverse rotation position where the forward rotation pulley is operated to the transmission blocking position and the reverse rotation pulley is operated to the transmission position so that the reverse rotation power is transmitted. The actuator and the switching member are interlockingly connected via an interlocking member, and the switching member is configured to be freely switchable between the forward rotation position and the reverse rotation position by the actuator. A first detecting means for detecting the operating position of the user, a second detecting means for detecting the operating position of the switching member, and an operating position of the actuator and the operation of the switching member based on the detection values of the first and second detecting means. A warning means is provided to give a warning if the positions do not correspond.

[0006]

According to the present invention, the switching member is operated by the operation of the actuator via the interlocking member between the forward rotation position and the reverse rotation position of the fan. In this case, if there is no abnormality in each part, the operating position of the actuator and the operating position of the switching member correspond to each other. On the contrary, if an abnormality occurs in the actuator, the interlocking member, the switching member, or the like, the operating position of the actuator does not correspond to the operating position of the switching member.

Therefore, by detecting the operating position of the actuator and the operating position of the switching member as in the present invention, and judging whether or not these operating positions correspond to each other and issuing a warning, the actuator and the interlocking member, The operator can accurately know that an abnormality has occurred in the switching member or the like.

[0008]

As described above, in the forward / reverse switching structure of the fan for the radiator, it becomes possible to accurately detect and warn the abnormality of the actuator or the like, and the engine overheats due to the malfunction of the fan based on this abnormality. It was possible to prevent a situation in which dust and the like could not be blown off from the radiator.

[0009]

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 supported by a pair of left and right crawler type traveling devices 1, a mowing section 3 is provided at the front of the machine, and a driving section 4 is provided at the rear right side of the mowing section 3. Are arranged to form a combine for harvesting and harvesting grain. As shown in FIG. 1 and FIG. 2, the bonnet 6 covering the engine 5 is provided with the cockpit 7 for the driving section 4 on the upper part,
Inside the bonnet 6, a radiator 8 and a fan 9 for the engine 5 are arranged.

Next, the drive structure of the fan 9 for the radiator 8 will be described. As shown in FIGS. 9 and 3, a pulley 11 is fixed to a rotary shaft 10 supported on the side surface of the engine 5, and the pulley 11, the output pulley 12 of the engine 5, and the input pulley 13a of the alternator 13 are connected to each other. 1 transmission belt 14 (corresponding to a belt transmission system) is wound. As shown in FIG. 3, a support arm 15a is swingably supported around a horizontal axis P3 of the case of the alternator 13, and a tension pulley 15 is provided at the tip of the support arm 15a. A spring 15b that urges the transmission belt 14 side is connected. As a result, the tension pulley 15 is constantly pressed against the outer surface of the first transmission belt 14.

A switching member 16 having a flat plate shape and a triangular shape is swingably supported on the rotating shaft 10, and a normal rotation pulley 17 having two pulleys stacked on the switching member 16 and two pulleys.
A reversing pulley 18 which is like a stack of sheets is supported. The fan 9 is rotatably supported by bearings on the pulley 11 of the rotating shaft 10, and the input pulley 9a is formed at the base of the fan 9. The input pulley 9a and the switching member 16 are used for normal rotation and reverse rotation pulleys 17 and 18 respectively. The second transmission belt 19 (corresponding to a belt transmission system) is wound over the entire length. As shown in FIGS. 7 and 10, the normal rotation pulley 17 is supported by the support shaft 17 a fixed to the switching member 16. On the other hand, the support shaft 18a of the reverse rotation pulley 18 is supported by the bolt 21 and the bracket 22 along the long hole 16a of the switching member 16 so that the position of the support shaft 18a can be adjusted. Is configured to be able to 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. The switching member 16 is moved to the forward rotation position A shown in FIG.
When it is rocked, the forward rotation pulley 17 is pressed against the inner surface of the first transmission belt 14 from the right side of the drawing, and the power of the first transmission belt 14 is increased by the forward rotation pulley 17 and the second transmission belt 1.
It is transmitted to the input pulley 9a through the input pulley 9a as a normal rotation power, and the fan 9 and the input pulley 9a are driven to rotate in the clockwise direction on the paper surface of FIG. In the state in which the fan 9 is normally driven in this way, the outside air serves as cooling air due to the suction action of the fan 9 as shown by the solid line arrow in FIG. 2 and passes from the dustproof net 20 of the bonnet 6 through the radiator 8 to the engine 5 side. This is the normal state.

On the contrary, when the switching member 16 is oscillated to the reverse rotation position B shown in FIG. 4, the reverse rotation pulley 18 is pressed against the outer surface of the first transmission belt 14 from the left side of the drawing, and the power of the first transmission belt 14 is increased. Is transmitted as a power for reverse rotation to the input pulley 9a through the reverse rotation pulley 18 and the second transmission belt 19, and the fan 9 and the input pulley 9a are reversely driven in the counterclockwise direction of FIG. In this manner, when the fan 9 is driven in the reverse direction, the air flows in the opposite direction to the above by the blowing action of the fan 9 as shown by the double-dashed line arrow in FIG. 2, and the surface of the radiator 8 and the dustproof net 20 ( Dust and the like adhering to the lower side) is blown off.

Next, the structure for swinging the switching member 16 for the fan 9 will be described. As shown in FIGS. 7 and 9, a disc-shaped first winding 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 winding member 23 Motor 24 that rotates
(Corresponding to an actuator) is provided, and the semi-disc-shaped second winding member 25 is also fixed to the switching member 16. The wire 26 (corresponding to the interlocking member) connected to the pin 23 a of the first winding member 23 is connected to the second winding member 2
It is wound around 5 and is connected to the support shaft 17a of the switching member 16, and the spring 27 (corresponding to an interlocking member) is connected between the pin 23a of the first winding member 23 and the switching member 16. .

The state shown in FIG. 7 is the first winding member 23.
Is positioned at an angle corresponding to the forward rotation position A of the switching member 16, the pulling action of the spring 27 causes the switching member 16 to swing to the forward rotation position A, and the fan 9 is normally driven. Is in a state of being in contact (see FIG. 3). In this state, the wire 26 slightly sags, and the biasing 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 cause the axis P1 of the first winding member 23 to move.
The first winding member 23 is about to be rotated clockwise in the drawing by the urging force of the spring 27, and a stopper 29 for stopping the first winding member 23 at the angle shown in FIG. 7 is provided. Therefore, the first winding member 23 is held at the angle shown in FIG. 7 by the urging force of the spring 27 and the action of the stopper 29.

Next, when the motor 24 drives the first winding member 23 to rotate counterclockwise by about 180 ° in the drawing, the wire 26 is pulled by the first winding member 23 while being wound around the first winding member 23. 16 and the second winding member 25 are also swung counterclockwise on the paper surface, the switching member 16 is swung to the reverse rotation position B as shown in FIG. 8, and the fan 9 is reversely driven (see FIG. 4). . As shown in FIGS. 7 to 8, when the switching member 16 is swung from the forward rotation position A to the reverse rotation position B, the spring 27 is pulled toward the switching member 16 as the switching member 16 swings. At the same time, the pin 23a of the first winding member 23 to which the spring 27 is connected also moves to the switching member 16 side (first winding member 2).
Therefore, the spring 27 does not have a great resistance to the swinging operation of the switching member 16 from the forward rotation position A to the reverse rotation position B.

On the contrary, as shown in FIG. 8, when the first winding member 23 is positioned at an angle corresponding to the reverse rotation position B of the switching member 16, the motor 24 causes the first winding member 23 to move to the paper surface time. When the wire 26 is driven to rotate by about 180 ° in the direction, the wire 26 is unwound from the first winding member 23, the spring 27 is pulled by the movement of the pin 23a, and the urging force of the spring 27 causes the switching member 16 and the second winding member 23 to move. 25 also swings counterclockwise in the drawing, and the switching member 16 is swung to the forward rotation position A as shown in FIG.

Next, a cycle when the switching member 16 is rocked to the reverse position B shown in FIGS. 4 and 8 will be described. In this cycle, as shown in FIG. 5, the switching member 16 is first held in the forward rotation position A only for the set time T2,
Next, the switching member 16 is oscillated from the forward rotation position A to the reverse rotation position B, and power does not flow to the fan 9 during this period. Then, the switching member 16 is held at the reverse rotation position B only for the set time T3, and then the switching member 16 is rocked from the reverse rotation position B to the normal rotation position A to complete one cycle of the cycle T1. Of.

In the above cycle, the fan 9
Is attached to the surface of the radiator 8 shown in FIG. 2 (the surface on the left side of the paper surface of FIG. 2) by once shutting off the power to the fan 9 from the state of being normally driven (see the neutral position in FIG. 5). Large dust and the like are dropped below the radiator 8 and the dustproof net 20 by the vibration of the machine body. Then, by driving the fan 9 in the reverse direction, the dust and the like adhering to the surface of the radiator 8 is blown off and dropped below the radiator 8 and the dustproof net 20. Blow it away.

Next, the flow of control when swinging the switching member 16 to the reverse position B in the cycle shown in FIG. 5 during normal work will be described. As shown in FIG. 6, when the threshing clutch (not shown) is operated to the disengaged position during the operation of the engine 5 (step S1) (step S2), the switching member 16 is held at the forward rotation position A. When the cage (step S9) is operated and the threshing clutch is operated to the engaged position (the operation of the threshing device 2 in FIG. 1) (step S2), the following control is started.

When the control is started, first, the switching member 16 is swung to the forward rotation position A (step S3), and a timer (not shown) starts counting (step S4).
The switching member 16 is in the forward rotation position A until the set time T2 elapses.
(Step S5). Next, when the set time T2 has elapsed (step S5), the switching member 16 is oscillated from the forward rotation position A to the reverse rotation position B (step S6), and the timer starts counting again (step S7).
The switching member 16 is in the reverse rotation position B until the set time T3 elapses.
(Step S8).

When the set time T3 elapses (step S8), the process proceeds from steps S1 and S2 to step S3, and the switching member 16 is oscillated from the reverse rotation position B to the forward rotation position A to perform one cycle. To finish. In this way, the cycle of cycle T1 shown in FIG. 5 is repeated.

Next, detection of various abnormalities in the swinging operation of the switching member 16 will be described. As shown in FIG. 7, a rotary potentiometer-type position sensor 28 (corresponding to a second detecting means) is fixed to the lateral surface of the engine 5, and a rotary detection shaft of the position sensor 28 is made of a rubber roller. 28a is fixed, and this roller 28a is applied to the outer peripheral surface of the second winding member 25. As a result, the swing angle (corresponding to the operating position) of the switching member 16 and the second winding member 25 is continuously detected as the detection voltage (corresponding to the detection value) from the position sensor 28.

On the other hand, an operation signal is transmitted from the control device (not shown) to the motor 24, and the motor 24 operates based on this operation signal. Then, by detecting this operation signal (corresponding to the detected value), the operating position of the motor 24 (the rotation angle of the first winding member 23) at that time can be detected (the above is the first detecting means). Equivalent).

With the above arrangement, the switching member 27 is rotated in the forward rotation position A by the motor 24 and the spring 27 as described above.
When the swing operation is performed to the reverse rotation position B, the detected operation signal to the motor 24 and the detected voltage of the position sensor 28 are compared as shown in FIG. 11 (step S1).
1). In this case, if there is no abnormality in each part, the operation signal to the motor 24 and the detection voltage of the position sensor 28 correspond to each other.

When the detected voltage of the position sensor 28 is larger than the operation signal to the motor 24 (step S1
2) The difference between the operation signal and the detected voltage is extracted (step S13). In this case, when the difference between the operation signal and the detected voltage is smaller than the set value (step S14), the first warning lamp (corresponding to warning means) (not shown) is turned on (step S15). In this state, the wire 2 of FIGS.
6 is slightly extended so that the switching member 16 slightly precedes the forward rotation position A side with respect to the operating position of the motor 24, and the detected voltage is slightly larger than the operation signal. In this way, the operator can know that the abnormality that the wire 26 is extended has occurred by turning on the first warning lamp (step S15).

When the detected voltage of the position sensor 28 is larger than the operation signal to the motor 24 (step S12), conversely, when the difference between the operation signal and the detected voltage is larger than the set value (step S14), the second warning is given. A lamp (corresponding to a warning means) (not shown) is turned on (step S16). Figure 7
At the forward rotation position A of the switching member 16 shown in FIG.
Is in a slightly slackened state, and the position of the switching member 16 in which the biasing force of the spring 27 and the tension of the first transmission belt 14 are balanced is the forward rotation position A. Therefore, when the motor 24 has reached the operating position corresponding to the forward rotation position A, but the detected voltage of the position sensor 28 is larger than the operation signal to the motor 24 by the set value or more, the first transmission belt 14 is disconnected. Thus, the urging force of the spring 27 causes the switching member 16 to swing beyond the above-mentioned balanced position (normal rotation position A).

Further, while the motor 24 is operating from the operating position corresponding to the forward rotation position A shown in FIG. 7 to the reverse rotation position B side, the detection voltage of the position sensor 28 is set higher than the operation signal to the motor 24. If larger than the value, wire 26
The switching member 16 is largely ahead of the operating position of the motor 24 on the forward rotation position A side due to the urging force of the spring 27. In this way, the operator cuts the first transmission belt 14 or the wire 26 by turning on the second warning lamp.
Can know that the disconnection has occurred (step S
16).

The operation signal to the motor 24 is the position sensor 2
If the detected voltage is higher than the detected voltage of 8 (step S17),
The difference between the operation signal and the detected voltage is extracted (step S
18). In this case, when the difference between the operation signal and the detected voltage is smaller than the set value (step S19), the third warning lamp (corresponding to warning means) (not shown) is turned on (step S20). In this state, the control device drives the motor 2
4, the operation signal of the motor 24 is delayed but the detected voltage of the position sensor 28 is a little smaller than the operation signal, or the motor 24 is operating normally but the switching member The swing of 16 is delayed, and the detected voltage of the position sensor 28 is slightly smaller than the operation signal. In this manner, the operator can know that the abnormality such as the malfunction of the motor 24 or the swinging of the switching member 16 has occurred by turning on the third warning lamp (step S20).

The operation signal to the motor 24 is the position sensor 2
If it is larger than the detection voltage of 8 (step S17), on the contrary, if the difference between the operation signal and the detection voltage is larger than the set value (step S19), a fourth warning lamp (corresponding to warning means) (not shown) Lights up (step S21). When the motor 24 is in the operating position corresponding to the forward rotation position A shown in FIG. 7 or while the motor 24 is operating from the operating position corresponding to the reverse rotation position B to the forward rotation position A side, the position sensor 28 When the operation signal to the motor 24 is larger than the detected voltage by the set value or more, the spring 27 is broken and the motor 24
The switching member 16 is in a state of being greatly delayed toward the reverse rotation position B side with respect to the operating position of. Thus, the operator can know that the spring 27 has been broken or otherwise damaged by turning on the fourth warning lamp (step S21).

[Other Embodiment] In the embodiment shown in FIG. 7, instead of the wire 26 and the spring 27, one linking rod (not shown) is used as an interlocking member, and the drive shaft of the motor 24 and the switching member 16 are connected. You may connect over. In the structure of FIGS. 3 and 4, the reverse rotation pulley 18 is pressed so that the forward rotation and reverse rotation pulleys 17 and 18 are reversed in position and the forward rotation pulley 17 is pressed against the outer surface of the first transmission belt 14. It may be configured to press against the inner surface of the first transmission belt 14.

Instead of the structure shown in FIGS. 3 and 4, a transmission belt for transmitting normal power and a pulley 17 for normal rotation (tension pulley), and a transmission belt for transmitting power for reverse rotation and a pulley 18 for reverse rotation (tension pulley). It is also possible to adopt a double-tension type structure provided with. Motor 2
A dedicated position sensor (not shown) for detecting the operating position of No. 4 (the rotation angle of the first winding member 23) may be provided. A warning buzzer (not shown) may be used as the warning means instead of the first to fourth warning lamps.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1] Overall side view of combine

FIG. 2 is a vertical sectional front view of the bonnet of the combine.

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

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

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

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

FIG. 7 is a front view showing the states of the switching member and the first and second winding members in the normal rotation state.

FIG. 8 is a front view showing a state of a switching member and first and second winding members in a reverse rotation state.

FIG. 9 is a vertical sectional side view in the vicinity of the switching member and the first and second winding members.

FIG. 10 is a cross-sectional view showing a support structure of a reverse rotation pulley in the switching member.

FIG. 11 is a diagram showing a control flow of abnormality detection.

[Explanation of symbols]

 8 radiator 9 fan 14 and 19 belt transmission system 16 switching member 17 forward rotation pulley 18 reverse rotation pulley 24 actuator 26 and 27 interlocking member 28 second detection means A forward rotation position B reverse rotation position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyoshi Hirata 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor Shigeki Hayashi 64, Ishizukita-cho, Sakai City, Osaka Prefecture Inside the factory

Claims (1)

[Claims] 1. A fan (9) for a radiator (8) capable of rotating in the normal and reverse directions by a forward rotating pulley (17) so that outside air is sucked through the radiator (8).
A belt drive system capable of selectively transmitting a normal rotation power for driving the fan and a reverse rotation power for driving the fan (9) in the reverse direction by the reverse pulley (18) so that air flows in the opposite direction. 14) and (19), the forward rotation pulley (17) is operated to a transmission position and the reverse rotation pulley (18) is operated to a transmission interruption position so that forward rotation power is transmitted. The reverse position (A), the forward rotation pulley (17) is operated to the transmission blocking position, and the reverse rotation pulley (18) is operated to the transmission position so that the reverse rotation power is transmitted. ) And a movable switching member (16), and the actuator (24) and the switching member (16) are interlockingly connected via interlocking members (26) and (27), Set the switching member (16) to the normal position. Together constitute freely switching operation in A) and the reverse rotation position (B), first detects the operating position of the actuator (24) 1
Actuation of the actuator (24) based on detection means, second detection means (28) for detecting the operating position of the switching member (16), and detection values of the first and second detection means (28). A forward / reverse switching structure for a fan for a radiator, which is provided with a warning means for issuing a warning when the position and the operating position of the switching member (16) do not correspond.