JP2002191221A - Reaping harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reaping harvester having such a mechanism as to make a temporary halt of the machine body by cutting off the power to a traveling unit while actuating a reaping unit, and designed to prevent occurrence of such an event that the machine body moves as a result of operating by mistake a halting operative tool by an operator. SOLUTION: This reaping harvester has the following construction: a brake is provided at a transmission system between a point where mechanical power is branched to a reaping unit and left and right side clutches and the left and right side clutches; there are also provided a manually operable halting operative tool 50 and a halting means 36 functioning to operate the left and right side clutches into cutoff side by operating the tool 50; besides, there is provided a check means 61 functioning to restrain operating the left and right side clutches into the cutoff side when the brake stands in actuation into braking side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harvesting and harvesting machine such as a combine harvester or a rush harvester, which cuts a field crop and threshes it, or cuts a field crop and binds it and loads it on a carrier. , Right and left traveling devices.

[0002]

2. Description of the Related Art In a combine harvester, which is an example of a harvester, a right and left traveling device is provided with a side clutch capable of transmitting and disconnecting power, and the right and left side clutches are operated on a transmission side. In some cases, the fuselage is made to travel straight and the right or left side clutch is operated to the disengagement side to change the orientation of the fuselage to right or left. In this case, a stop operating device capable of operating the right and left side clutches on the disengagement side is provided, and when the operator operates the stop operation device and operates the right and left side clutches on the disengagement side, the mowing unit (threshing) The apparatus can be stopped (a state in which power transmission to the right and left traveling apparatuses is interrupted) in a state where the apparatus is operated (a state in which power is transmitted to the mowing unit (threshing apparatus)).

[0003] The combine is equipped with a cutting unit for cutting the crops in the field and a threshing device for threshing the cut crops.
A mode of threshing a cut crop is a common work mode. On the other hand, for example, when cutting a crop at the end of the field, the cutting section and the threshing device are operated in a state where the machine body is stopped (the state of transmission to the right and left traveling devices is cut off), and the field is cut off. The operator operates the stop operation tool to stop the aircraft as described above (the transmission to the right and left traveling devices is cut off). , Can be adapted to the above-described working modes.

[0004] In the combine, in a power transmission system from the engine to the reaping unit and the right and left side clutches, the power is branched between the reaping unit and the right and left side clutches, and between the right and left side clutches. Some transmission systems are equipped with a brake. Thus, in a state where the right and left side clutches are operated on the transmission side (straight running state), the brakes are operated on the braking side, so that the right and left traveling devices can be braked to stop the aircraft. it can. As described above, the state in which the right and left traveling devices are braked to stop the aircraft is such that the aircraft is stopped for a relatively long time, such as when a day's work is completed or when the work is interrupted. Often.

[0005]

Thus, for example, on a slope or the like, the brake is operated to the braking side to stop the aircraft (the right and left traveling devices are braked to stop the aircraft). If the operator accidentally operates the stop operating device, the right and left side clutches are operated to the disengaged sides, and the braking force of the brake is not applied to the right and left traveling devices, and the aircraft It is conceivable that a state in which the object moves may occur. The present invention relates to a reaper equipped with right and left side clutches, a stop operation device, and a brake as described in the related art, in which the operator operates the stop operation device by mistake, and the airframe moves. The purpose is to prevent such a situation.

[0006]

According to a first aspect of the present invention, in the power transmission system for the reaping unit and the right and left side clutches, power is branched to the reaping unit and the right and left side clutches. A brake is provided in the transmission system between the branch point and the right and left side clutches, and a stop operation device that is artificially operated, and the right and left side clutches are operated to the disengagement side by operating the stop operation device In the case where the brake device is provided with a stopping means, a braking means is provided for preventing the right and left side clutches from operating to the disengagement sides when the brake is operated on the braking side.

Thus, according to the first aspect of the present invention, for example, on a slope or the like, the brake is operated to the braking side to stop the machine (the right and left traveling devices are braked to stop the machine. State), the driver accidentally attempts to operate the right and left side clutches to the disengagement side by the stop operating tool, since the operation of the right and left side clutches to the disengagement side is prevented, so that the braking force of the brake is reduced. Is not applied to the right and left traveling devices, and the state in which the aircraft moves does not occur.

[II] According to the feature of claim 2, similar to the case of claim 1, it has the "action" described in the above-mentioned [I], and additionally has the following "action". ing. According to a second aspect of the present invention, when the brake is operated on the braking side, the stopping means is prevented from being operated, so that the right and left side clutches are prevented from being operated on the disengaged sides. Is configured. This allows
According to the second aspect of the present invention, the driver cannot operate the stop operation device by mistake while the brake is being operated on the braking side, and the right and left side clutches are not disengaged. Operation to is blocked. Since the stop operating tool cannot be operated in this manner, the driver can recognize that the operator has attempted to operate the stop operating tool while the brake is being operated on the braking side.

[III] According to the feature of claim 3, similar to the case of claim 1 or 2, the "action" described in the above-mentioned [I] and [II] is provided. Has "action". As described in the related art, as a mode of operating the reaping unit in a state in which the body is stopped (a state in which transmission to the right and left traveling devices is cut off), an operation of reaping a crop at an end of a field is performed. Other than the form, maintenance work of the reaper and the like may be performed. According to the third aspect of the present invention, the holding means for holding and releasing the stop operation tool is provided at the position where the right and left side clutches are operated to the disengagement side. When performing the work, if the stop operation tool is held at the position where the right and left side clutches are operated to the disengagement side, the pilot moves away from the position of the stop operation tool and performs maintenance work such as a reaper. Can be.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [I] As shown in FIG. 1, a cutting section 43 for cutting a grain culm in a field is driven up and down in front of a body supported by a crawler type right and left traveling device 4. , A driving unit 44 is provided on the front right side of the fuselage, and a threshing device 45 is provided on the rear part of the fuselage, thereby forming a combine as an example of a reaper.

[II] Next, the structure of the transmission case 2 of the traveling system will be described. As shown in FIG. 2, the power of the engine E is controlled by a main clutch 46 of a tension clutch type.
Through the input pulley 16 of the hydrostatic continuously variable transmission M
Is transmitted to The power of the output shaft 1 of the hydrostatic continuously variable transmission M is transmitted from the transmission shaft 14 to the reaping unit 43 via the output pulley 15 and the tension clutch type reaping clutch 47, and via the tension clutch type threshing clutch 48. And transmitted to the threshing device 45.

The power of the output shaft 1 is transmitted to a transmission shaft 21 via a transmission gear 10, a first high-speed gear 22 is fitted on the transmission shaft 21 so as to be relatively rotatable, and the shift gear 3 slides in a spline structure. It is externally fitted for operation. A low-speed gear 25, a medium-speed gear 8 and a second high-speed gear 2
3 is externally fitted in a spline structure, and the first and second high-speed gears 22, 23 are engaged. Thus, by sliding the shift gear 3 to mesh with the first high-speed gear 22, the medium-speed gear 8, and the low-speed gear 25, the power can be shifted into three stages of high, medium, and low. Is transmitted to the first output gear 7 which meshes with the first output gear 7.

Right and left side gears 12 are rotatably fitted on the support shaft 6 supporting the first output gear 7, and input gears 18 of the right and left axles 5 are engaged with the right and left side gears 12. are doing. Thus, between the right or left side gear 12 and the first output gear 7, an occlusal right and left side clutch FC is formed.
The positive engagement power 13 is transmitted to the right and left traveling devices 4 by engaging the convex engagement portion 13 with the first output gear 7 (the transmission state of the right and left side clutches FC). The spring 19 biases the right and left side gears 12 toward the first output gear 7.

A pair of second output gears 9 are externally fitted on the left and right sides of the support shaft 6, and a multi-plate friction type right and left revolving clutch is provided between the right and left second output gears 9 and the support shaft 6. An RC is provided. The transmission gear 11 is fixed to both ends of the transmission shaft 24, the sleeve 38 is externally fitted to the bearing portion, the transmission shaft 24 is slidable, and a switching lever 37 for sliding the transmission shaft 24 is provided. I have. Low speed gear 2
Since the gear 5 and the medium speed gear 8 are positioned by the sleeve 26, even if the transmission shaft 24 is slid, the positions of the low speed gear 25 and the medium speed gear 8 do not change.

The state shown in FIG. 2 is a state in which the transmission shaft 24 is being slid to the left in the drawing, and a state in which the right and left transmission gears 11 are engaged with the right and left transmission gears 27. In this state, the power of the transmission shaft 24 is transmitted to the right and left second output gears 9 in the reverse rotation state via the transmission gear 27, the transmission shaft 39, and the transmission gear 28. Accordingly, for example, the left side gear 12 is separated from the first output gear 7 (the left side clutch FC is in a disconnected state), and the pressing portion 17 of the left side gear 12 presses the left turning clutch RC, and the left turning clutch RC Is operated to the transmission side, the second output gear 9 on the left
Is transmitted to the traveling device 4 on the left side, and a left turn can be performed to the left. When the pressing force of the left side gear 12 is weakened and the left turning clutch RC is slid, the right traveling device 4
, And the driving force of the reverse rotation of the left traveling device 4 is balanced, and the left traveling device 4 is apparently stopped. Thereby, a pivot turn can be performed to the left.

When the transmission shaft 24 is slid rightward from the state shown in FIG. 2, the right and left transmission gears 11 mesh with the right and left second output gears 9. As a result, forward rotation power that is lower in speed than the forward rotation power transmitted from the transmission shaft 24 to the first output gear 7 is transmitted from the transmission shaft 24 to the right and left second output gears 9. Therefore, for example, the left side gear 12
From the first output gear 7 (the left side clutch F
C), when the left turning clutch RC is pressed by the pressing portion 17 of the left side gear 12 and the left turning clutch RC is operated to the transmission side, the left traveling device 4 becomes the right traveling device 4.
The rotation is forwardly performed at a lower speed than that, and a gentle turning to the left can be performed.

As shown in FIGS. 4 and 5, a mowing clutch lever 40 for operating the mowing clutch 47 on the transmission side and the disengagement side, and a threshing clutch lever 41 for operating the threshing clutch 48 on the transmission side and the disengaging side are provided with an operating section. An operation plate 40 a that is disposed on the left side of the driver's seat 42 at 44 and enters the rear side of the threshing clutch lever 41 is fixed to the reaping clutch lever 40. Thus, when the mowing clutch lever 40 is operated from the disengaged position to the transmission position, the threshing clutch lever 41 is operated from the disengaged position to the transmission position by the operation plate 40a. The threshing clutch lever 41 can be operated to the transmission position and the interruption position while the reaping clutch lever 40 is operated to the interruption position.

[III] Next, the right and left side gears 1
The structure of the slide operation 2 will be described. As shown in FIGS. 2 and 3, an operation arm 20 for sliding the right and left side gears 12 and a right and left hydraulic cylinder 29 for swinging the right and left operation arms 20 are provided. Right and left hydraulic cylinders 29 are springs (not shown)
The hydraulic fluid of the pump 30 is supplied to the electromagnetically operated swing control valve 31 for the right and left hydraulic cylinders 29.

As shown in FIG. 3, the right and left side gears 12 are separated from the first output gear 7, and the right and left side clutches RC are not operated to the transmission side. When the right and left hydraulic cylinders 29 extend until the right and left turning clutches RC are disengaged, the hydraulic oil is drained from the right and left hydraulic cylinders 29 and the right and left hydraulic cylinders 29 are released. A drain oil passage 32 that is stopped in the neutral position is provided.
2 is provided with a variable relief valve 33.

The state shown in FIGS. 2 and 3 is a straight traveling state in which the right and left side gears 12 are engaged with the first output gear 7 (the transmission state of the right and left side clutches FC). For example, the operation lever 34 is moved from the straight traveling position N to the left first turning position L.
1, the turning control valve 31 is operated to supply hydraulic oil to the left hydraulic cylinder 29 and the left side gear 12
Is slid to the left in the drawing and separated from the first output gear 7 (the left side clutch FC is disconnected).

In this case, the neutral position (the right and left side clutch FC, the right and left swing clutch RC) before the left side gear 12 operates the left turning clutch RC to the transmission side.
), The drain oil passage 32 is opened, the hydraulic oil is released from the variable relief valve 33, and the left side gear 12 is in the neutral position (the right and left side clutch FC and the right and left turning clutch RC are disconnected). Stop at This state is a state in which power to the left traveling device 4 is shut off, and the aircraft slowly turns to the left.

Next, when the operating lever is operated from the left first turning position L1 to the left second turning position L2, the variable relief valve 33 is throttled, and the left hydraulic cylinder 29 is moved to the neutral position (right and left). The left swing gear RC is operated to the transmission side by the left side gear 12 after being extended from the side clutch FC and the right and left swing clutches RC being disconnected. In this case, if the transmission shaft 24 is slid leftward on the paper as shown in FIG. 2, the left traveling device 4 is driven to rotate in the reverse direction, and the fuselage turns leftward to the left.

When the operating lever 34 is positioned between the left and right turning positions L1 and L2, the operating oil is removed from the left hydraulic cylinder 29 from the state described above, and the pressing force of the left side gear 12 is reduced. Can be weakened. As a result, the left turning clutch RC slides, the forward driving force of the right traveling device 4 and the reverse driving force of the left traveling device 4 are balanced, and the left traveling device 4 is apparently stopped, The aircraft turns to the left. When the operating lever 34 is operated between the position where the left turning clutch RC slides and the second turning position L2, the pressing force of the left side gear 12 is changed, and the left traveling device 4 is moved.
You can change the reverse rotation speed.

Next, when the transmission shaft 24 in the state shown in FIG. 2 is slid to the right on the paper surface and the right and left transmission gears 11 are engaged with the right and left second output gears 9, for example, When the driver 34 is operated from the left first turning position L1 to the left second turning position L2, the left traveling device 4 is driven in a forward rotation state at a lower speed than the right traveling device 4, and the aircraft slowly turns left. I do. The position where the left turning clutch RC slides and the second turning position L
When the operation lever 34 is operated between the left side gear 2 and the left side gear 12, the pressing force of the left side gear 12 is changed, and the forward rotation speed of the left traveling device 4 can be changed. The operation by the operation lever 34 as described above includes the right first turning position R1 and the right second turning position R2.
Is performed similarly.

[IV] Next, the cutting unit 43 and the threshing device 4
A structure for stopping the airframe while allowing transmission of power to the vehicle 5 will be described. As shown in FIG.
An open / close valve 36 is provided in the first oil drain passage 35, and the spring 3
The open / close valve 36 is biased to the open position by 6a. As a result, as shown in FIG.
(When the turning control valve 31 is operated to the neutral position and the right and left side clutches FC are operated to the transmission side) when the on-off valve 36 is operated to the closed position. Cannot get out of the oil drain 35,
The state is supplied to the right and left hydraulic cylinders 29.
Accordingly, the right and left hydraulic cylinders 29 are extended, and the right and left hydraulic cylinders 29 are in the neutral position by the action of the drain oil passage 32 (the right and left side clutches FC and the right and left turning clutches RC are disconnected). Stop at

The neutral position (disengaged state of the right and left side clutches FC and the right and left turning clutches RC) corresponds to the right and left side gears 12 as described in [III] above.
Are separated from the first output gear 7 and the right and left side gears 1
Reference numeral 2 denotes a position where the right and left turning clutches RC are not operated on the transmission side. As a result, the power to the right and left traveling devices 4 is shut off, and the aircraft stops.

As shown in FIGS.
An operation pedal 50 is supported on the right front part of the step part 49 of the fourth unit so as to be vertically movable, and the opening / closing valve 36 is arranged below the step part 49. A balance-like operation arm 52 is swingably supported around a horizontal axis P1 of a bracket 51 fixed to the on-off valve 36, and a lower end of the operation pedal 50 is connected to an end of the operation arm 52. The leaf spring 53 is fixed above the operation portion 36b of the on-off valve 36.

As a result, when the operation pedal 50 is depressed, the operation arm 52 swings counterclockwise in FIG. 8, and the leaf spring 53 is pushed downward by the pin 52 a of the operation arm 52, and the leaf spring 53 is pushed. The operating part 36b of the on-off valve 36 is pushed by the 53, and the on-off valve 36 is operated to the closed position. When the foot is released from the operation pedal 50, the operation pedal 50 and the operation arm 52 return to their original positions by the urging force of the leaf spring 53, and the on-off valve 36 is operated to the open position by the spring 36a (see FIG. 3).

As shown in FIG. 6, a hole 50a is provided in an intermediate portion of the operation pedal 50. Thus, by inserting the fixing pin (not shown) into the hole 50a of the operation pedal 50 in a state where the operation pedal 50 is depressed (in a state where the on-off valve 36 is operated to the closed position), the fixing pin is stepped. By engaging with the portion 49, the state where the operation pedal 50 is depressed (the state where the on-off valve 36 is operated to the closed position) can be maintained. When the fixing pin is removed from the hole 50a of the operation pedal 50, the operation pedal 50 returns to the original position as described above.

[V] Next, the parking structure will be described.
As shown in FIGS. 4, 6, and 8, a brake pedal 55 is swingably supported around a horizontal axis P <b> 2 of the left vertical wall portion of the driving unit 44, and the brake pedal 55 is provided with a step portion 55 a. . As shown in FIG. 2, in the transmission case 2, a brake 54 is provided for the left transmission shaft 39, and the brake pedal 55 and the brake 54 are mechanically linked via a link rod 57. (Not shown) for biasing the spring toward the return side is provided.

As a result, as shown in FIG. 2 and the preceding section [II], the transmission shaft 24 is slid to the left on the paper,
When the brake 54 is operated to the braking side in a state where the right and left transmission gears 11 are engaged with the right and left transmission gears 27, the support shaft is transmitted via the left transmission gear 27 and the left transmission shaft 24. 6 is braked. The transmission shaft 24 is slid rightward on the paper surface of FIG. 2, and the brake 54 is operated to the braking side while the right and left transmission gears 11 are engaged with the right and left second output gears 9. Then, the support shaft 6 is braked via the left transmission gear 28, the left second output gear 9 and the transmission shaft 24.

As shown in FIGS. 6 and 8, a hook-shaped locking member 5 is provided around the horizontal axis P3 of the left vertical wall of the driving unit 44.
8 is swingably supported, and the locking member 5 is
8 is urged in the counterclockwise direction in FIG. 6 and is stopped in a posture shown in FIG. 6 by a stopper (not shown). A J-shaped guide portion 59 is opened in the left vertical wall portion of the operating portion 44, an operation rod 60 is connected to the lock member 58, and the tip of the operation rod 60 passes through the guide portion 59 and the operation portion 44.
And a grip portion 60 a is provided at the tip of the operation rod 60.

When the brake pedal 55 is depressed in the state shown in FIG. 6, the brake 54 can be operated to the braking side. As shown in FIG. And the brake pedal 55 is held at the position where the brake pedal 55 is depressed (braking position). Next, when the grip member 60a is held and the operation rod 60 is pushed downward to swing the lock member 58 clockwise in FIG. 7 and disengage from the pin 55b of the brake pedal 55, the brake pedal 55 is returned. Thus, the brake 54 is operated to the release side.

By holding the grip portion 60a and pushing the operation rod 60 downward, the grip portion 60a is moved to the guide portion 59.
6, the lock member 58 can be held in a state where the lock member 58 is swung clockwise in FIG. As a result, even if the brake pedal 55 is depressed, the lock member 58 is locked by the pin 55b of the brake pedal 55.
When the foot is released from the brake pedal 55, the brake pedal 55 is returned.

As shown in FIGS.
2, a restraining rod 61 is supported at the end opposite to the operation pedal 50 and extends upward.
Are guided so as to be movable up and down. Thereby, as described in the preceding section [IV], when the operation pedal 50 is depressed, the operation arm 52 swings counterclockwise in FIG. 8 and the on-off valve 36 is operated to the closed position. As a result, the restraining rod 61 moves upward.

The state shown in FIGS.
Is not operated. In this state, the brake pedal 55 is depressed as shown in FIG.
When the brake pedal 55 is held at the position where the brake pedal 55 is depressed by the lock member 58 (braking position), the brake pedal 5
The fifth restraint plate 55c is located immediately above the upper end of the restraint rod 61. Therefore, in this state, even if the operator attempts to depress the operation pedal 50 (even if the restraining rod 61 moves upward), the upper end of the restraining rod 61 contacts the restraining plate 55c of the brake pedal 55. The stepping operation cannot be performed (the on-off valve 36 cannot be operated to the closed position).

[Another Embodiment of the Invention] In the above-mentioned [Embodiment of the invention], the on-off valve 36 is closed by a switching lever (not shown) manually operated by the operator instead of the operation pedal 50. You may comprise so that operation to a position is possible.

[0038]

According to a first aspect of the present invention, in a reaper equipped with right and left side clutches, a stop operation tool, and a brake, the body is stopped by operating the brake on the braking side on, for example, a slope. In the state (the state in which the right and left traveling devices are braked and the aircraft is stopped), even if the operator erroneously attempts to operate the right and left side clutches to the disengagement side with the stop operation tool, the right and left By configuring so that the operation of the side clutch to the disengagement side is prevented, it is possible to avoid a state in which the braking force of the brake is not applied to the right and left traveling devices and the aircraft moves. Now you can.

According to the feature of the second aspect, the "effect of the invention" of the first aspect is provided similarly to the case of the first aspect, and in addition to the "effect of the invention", the following "invention" is provided. Of the effect. According to the second aspect of the present invention, in a state where the brake is operated on the braking side, the operator cannot operate the stop operating device by mistake when trying to operate the stop operating device. Attempting to operate the stop operation tool while being operated,
This has made it possible for the pilot to be recognized, which is preferable in terms of calling attention to the pilot.

According to the features of claim 3, claim 1 or 2
"Effects of the Invention" of Claim 1 or 2 as in the case of
In addition to this “effect of the invention”, the following “effect of the invention” is provided. According to the feature of the third aspect, the body is stopped (the transmission to the right and left traveling devices is cut off) by holding the stop operation tool at the position where the right and left side clutches are operated to the disengagement sides. State),
In a state where the mowing unit is operated, the operator can perform maintenance work of the mowing unit and the like away from the position of the stop operating tool, thereby improving workability of the mowing and harvesting machine. .

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine.

FIG. 2 is a diagram showing a transmission structure of a combine;

FIG. 3 is a diagram showing a structure of a sliding operation of right and left side gears.

FIG. 4 is a plan view showing the vicinity of an operation unit.

FIG. 5 is a plan view showing the relationship between a cutting clutch lever and a threshing clutch lever.

FIG. 6 is a side view showing the vicinity of a brake pedal, an operation pedal, and an on-off valve.

FIG. 7 is a side view showing a state in which a brake pedal is operated from the state shown in FIG. 6;

FIG. 8 is a front view of the vicinity of a brake pedal, an operation pedal, and an on-off valve.

FIG. 9 is a plan view near the operation pedal and the on-off valve.

[Explanation of symbols]

 Reference Signs List 4 traveling device 36 stopping means 43 reaping section 50 stop operating tool 54 brake 61 checking means E engine FC side clutch

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tokumune Ozaki 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Plant (72) Inventor Makoto Miyazaki 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. On-site F term (reference) 2B043 AA03 AB19 BA02 BA05 BB14 DB05 DB06 DB07 2B076 AA03 BA05 CD02 DB06 DB09 DC01 DD04 EB04

Claims (3)

[Claims] 1. A reaping section for cutting a crop in a field, and right and left traveling devices, side clutches capable of transmitting and disconnecting power are provided in each of the right and left traveling devices, In the transmission system to the right and left side clutches, a braking system is provided to a transmission system between the right and left side clutches and a branch point where power is branched to the reaper and the right and left side clutches. A stop operating device that is artificially operated, and a stop unit that operates the right and left side clutches to the disengagement side by operating the stop operation device, wherein the brake is operated to the braking side. The harvester is further provided with a check means for preventing the right and left side clutches from operating toward the disengaged side. 2. The braking means according to claim 1, wherein, when the brake is operated on the braking side, the operation of the stop operation device is prevented, so that the right and left side clutches are prevented from being operated on the disengagement side. The harvester and harvester according to claim 1, wherein 3. The reaper and harvester according to claim 1, further comprising a holding means capable of holding and releasing the stop operation tool at a position where the right and left side clutches are operated to the disengagement side.