KR101224718B1 - Operating device for work vehicle - Google Patents

Abstract

An object of the present invention is to use a single operation lever to avoid operation forgetting and misoperation of the operation lever, and to diversify the driving modes of the PTO clutch and the differential device.
The differential control device is provided with a differential device, and the work system drive mechanism includes a PTO clutch for intermittent transmission of power to the work device side, and the differential control device and the single operation lever 4 connected to the PTO clutch are differential. Switch to work position s3 for turning on the PTO clutch in the locked state, non-working travel position s1 for turning the PTO clutch off in the differential lock state, and differential lock non-working position s2 for turning the PTO clutch off in the differential lock state. It is comprised so that operation is possible.

Description

Control device of work machine {OPERATING DEVICE FOR WORK VEHICLE}

TECHNICAL FIELD This invention relates to the operation apparatus of the work machine provided with the traveling system transmission mechanism which transmits the transmission power from the engine side to the traveling apparatus side, and the work system transmission mechanism which transmits to the working apparatus side.

As an operation apparatus of this kind of work machine, the thing of following [1] and [2] is known.

[1] The steering wheel portion includes a PTO clutch lever and a traveling clutch lever, and a differential lock pedal and a differential lock release pedal are provided at the rear portion of the driving mission case so as to be separately operable (see Patent Document 1). .

[2] For road driving, which has a bent portion in the middle of the guide groove constituting the operation path of the single operation lever, the high speed travel is possible on the front end side of the guide groove, the PTO clutch is turned off, and the differential lock is released. When the non-working travel position is set, and operated backwards from the non-working travel position to operate at the bent point, the low-speed travel is possible, the PTO clutch is turned off, and the non-work for the roadwork at the low speed with the differential lock released. When the traveling position is set and the operation in the transverse direction intersecting the high and low speed shift path of the roadbed running at the bending point is performed, the low-speed traveling is possible, the PTO clutch is operated on, and the working position for the planting machine work is in the differential lock state. Configured to be set (see Patent Document 2).

Japanese Patent Application Laid-Open No. 07-125648 (paragraphs [0013], [0016], Fig. 1, Fig. 2) Japanese Patent No. 3567622 (paragraphs [0015], [0016], [0017], Figs. 5 and 6)

As described in Patent Document 1, when the PTO clutch lever, the differential lock pedal and the differential lock release pedal are constituted by respective operation tools, the on / off operation of the PTO clutch and the locking and unlocking of the differential device can be freely set. This is useful in that various drive types can be selected. However, although a plurality of operating tools exist, it is convenient to perform a quick operation using the hands and feet, but it tends to cause a complicated operation by handling a plurality of operating tools, and at the same time, a plurality of operating tools are individually operated. It may cause forgetting and misoperation of an operation tool of something, and there exists room for improvement in this point.

On the other hand, as described in Patent Document 2, in the structure in which the PTO clutch and the differential device can be operated by using a single operation lever, it is easy to avoid the above-mentioned operation forgetting or misoperation. Although it is useful in the above, as the driving mode of the work machine, as described above, the road running mode in which the PTO clutch is turned off and the differential lock is released, and the work mode in which the PTO clutch is turned on and operated in the differential lock state are selected. It was not possible to expect more diversification of drive types.

SUMMARY OF THE INVENTION An object of the present invention is to enable a PTO clutch and a differential device to be operated using a single operation lever, thereby avoiding the occurrence of operation forgetting or misoperation of the operation lever, and at the same time varying the driving modes of the PTO clutch and the differential device. It is to promote anger.

[Resolution 1]

The technical means of the present invention devised to solve the above problems is an operating device of a work machine provided with a traveling system transmission mechanism for transmitting the transmission power from the engine side to the traveling apparatus side, and a work system transmission mechanism for transmitting to the working apparatus side. And a PTO clutch provided with a differential device in the traveling system transmission mechanism and intermittently intermittent to transmit power to the work system side in the work system transmission mechanism, wherein the single system is connected to the differential device and the PTO clutch. The operation lever is a working position for turning on the PTO clutch in the differential lock state, a non-working driving position for turning off the PTO clutch in the differential lock state, and a differential lock non-working position for turning off the PTO clutch in the differential lock state. It is characterized in that it is configured to be capable of switching operation.

[Operations and Effects of the Invention on Solution 1]

According to the constitution of the present invention according to the above-mentioned solution 1, in the differential lock state, apart from the work position in which the PTO clutch is operated on in the differential lock state or the non-working traveling position in which the PTO clutch is operated off in the differential lock release state, The differential lock can be placed in the non-working position where the PTO clutch is to be turned off.For example, when the work machine is crossed over the rice paddle or when loading and unloading a load vehicle using a stepping plate, the work machine is kept in the differential locked straight state. It was possible to drive stably and to keep the drive of the external power output shaft stationary, so that various driving modes could be obtained.

Further, since the differential lock non-working position can be operated by a single operation lever for operating the differential lock operation mechanism and the PTO clutch operation mechanism, the same troublesome operation as in the case of separately operating each of the plurality of operation levers is achieved. There is no possibility to select quickly by simple operation which only changes the operation position of a single operation lever, and also there is little possibility of causing operation forgetting and misoperation.

[Solution 2]

According to another technical means of the present invention, which has been devised to solve the above problems, the operation path of the operation lever includes a straight path between the non-working travel position and the differential lock non-working position, and a transverse direction from the straight path. It is formed by the bending path | route which reaches the said working position via the lateral movement path | route part, It is characterized by the above-mentioned.

[Operations and Effects of the Invention on Solution 2]

According to the structure of the invention which concerns on said solution 2, the operation path of an operation lever is not comprised by the straight linear path | route in the whole, and the operation path to a working position is the horizontal direction from a straight path to the horizontal side. Since it is formed by the bending path | route provided with the movement path part, the operation lever can be operated toward a working position at once, and the problem, such as a drive system drive mechanism and a work system drive mechanism being drastically driven, can be avoided. .

[Solution 3]

According to another technical means of the present invention, which has been devised to solve the above problem, the differential lock non-working position is set between the working position and the non-working traveling position in the operation path of the operation lever. do.

[Operation and Effects of the Invention on Solution 3]

According to the structure of the invention concerning the said solution 3, when selecting the said differential lock non-working position, unnecessary drive of a traveling system drive mechanism and a work system transmission mechanism can be eliminated, and smooth selection operation can be performed.

That is, when the differential lock non-working position is set to a position closer to the end side of the operation path than the working position or the non-working running position, the PTO clutch is operated at the working position in the operation path before reaching the differential lock non-working position. Is turned on or the differential lock is released from the non-work traveling position. Therefore, after reaching the differential lock non-working position, the PTO clutch must be switched off again to be in the differential lock state, but in the configuration of the invention according to Solution 3, the differential lock non-working position is Since it is set between the position and the said non-working traveling position, there exists an advantage which can switch to a differential lock non-working position smoothly without generating unnecessary drive of such a work system transmission mechanism.

[Solution 4]

According to another technical means of the present invention, which has been devised to solve the above problems, the PTO clutch is spring-loaded to the clutch on side, and the operation lever is operated on the non-work by the pressing force to the clutch on side of the PTO clutch. It is characterized by being provided with a resistance means which is pressed from the position side to the work position side, and the operation lever is provided with resistance to movement from the straight path side to the bend path side.

[Operations and Effects of the Invention on Solution 4]

According to the structure of the invention which concerns on said solution 4, the operation lever connected to the PTO clutch operation mechanism of the PTO clutch which is spring-pressed to the clutch on side is made into the differential lock non-working position or the work from the non-working traveling position side. When operating to the position side, since it can operate using the spring pressing force to the clutch on side of a PTO clutch, the on operation of a PTO clutch can be operated lightly.

By using the spring pressing force on the clutch on side of the PTO clutch in this way, the operation lever in the state of being pressed on the clutch on side is formed of the straight path and the bending path, and the bending path from the straight path side. By providing the resistance means which provides resistance to the movement to the side, it is possible to stably maintain the operation position of the operation lever in the differential lock non-working position.

1 is an overall side view of a walking cultivator.
2 is an overall plan view of a walking cultivator.
3 is a side view showing the operation device portion;
4 is a plan view showing an operation device portion;
5 is an exploded perspective view showing the operation device;
6 is a cross-sectional view taken along the line VI-VI in FIG. 4.
7 is a plan view showing a part of the operation device except the lever guide;
8 is a plan view showing an operation path portion of the operation lever;
9 is a side view showing the operation device portion;
10 is a side view showing the operation device portion;
Fig. 11 is a side view showing the operation device portion.

 EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on description of drawing.

[Overall Configuration of Walking Type Tiller]

BRIEF DESCRIPTION OF THE DRAWINGS It is an overall side view which shows the walking type tiller to which the operation device of the working machine which concerns on this invention is applied.

As shown in this figure, the walking type tiller is provided with a steering wheel 12 on the rear side of the base frame 10 on which the engine 11 is mounted, and a pair of left and right supporting the base frame 10. A self-propelled body 1 equipped with a tire-type traveling wheels 13 and 13 (equivalent to a traveling device) and a rear portion side of the body frame 10 of the self-propelled body 1. The rotary tillage device 2 (corresponding to a work device) connected is configured.

The base frame 10 includes a mission case 3 for supporting the pair of left and right axles 13a and 13a and the tilling shaft 20 of the rotary tillage device 2, and the mission case 3. It consists of the engine support frame 10A extended from a gas front direction.

Although not shown in the mission case 3, a traveling system transmission mechanism composed of a known gear transmission mechanism, an electric chain, or the like for transmitting engine power to the traveling wheels 13 and 13, and a rotary tillage device 2 The work system transmission mechanism which consists of a well-known gear transmission mechanism, an electric chain, etc. for transmitting engine power is arrange | positioned.

The traveling system transmission mechanism includes a differential device 30 for transmitting a driving force in a synchronous rotation or differential rotation state with respect to the left and right travel wheels 13 and 13, and the differential device 30 in a differential lock state and a differential. A differential lock operation mechanism (not shown) for operating in the unlocked state is provided. The work system transmission mechanism includes a PTO clutch 31 for intermittent driving force to the rotary tilling device 2, and A PTO clutch operating mechanism (not shown) for turning on and off the PTO clutch 31 is provided.

In addition, although not shown in the mission case 3, a transmission device for shifting engine power to the traveling system transmission mechanism and the work system transmission mechanism is also incorporated. By the operation of the shift operation lever 17 extending from the rear part side of 3) to the body rear upper side, the operator holding the steering wheel 12 is configured to be shiftable from the body rear side.

The steering wheel 12 extends rearward upward from the handle support 3a provided at the case outer periphery of the rear side of the mission case 3.

As shown in FIG. 1 and FIG. 2, the steering wheel 12 has an on-off operation of the main clutch 14 which controls the power from the engine 11 with respect to the transmission device in the mission case 3. Operation mechanisms such as a clutch lever 15 for operation, an accelerator operation tool 16 and a single operation lever 4 for operating the PTO clutch 31 and the differential device 30 described later are provided.

As shown in FIGS. 1 to 4, the clutch lever 15 for operating the main clutch 14 on and off is handle lever portions 12a on both the right and left sides of the steering wheel 12 in plan view. And a door-shaped shape spanning the handle lever portion 12b on the rear side, and are attached to the handle lever portions 12a on both the left and right sides so as to be capable of swinging around the horizontal axis x1. As a result, the clutch lever 15 has the clutch off position standing with respect to the steering wheel 12 as shown by the solid line in FIG. 3, and the upper edge of the steering wheel 12 as shown by the virtual line in the figure. It is configured to be able to switch posture in a clutch-on position that has been knocked down.

As shown in FIGS. 1 to 3, a part of the handle lever part 12b on the rear side is partially concave downward on the handle lever portion 12b on the rear side, as shown in FIGS. 1 to 3. The recessed part 12c of the recessed shape is formed. This recessed portion 12c is the clutch on position that is knocked down along the upper edge and the upper edge of the handle lever portion 12b on the rear side when the upper portion of the clutch lever 15 is switched and operated in the clutch on position. To form a space between the clutch levers 15 of the handle lever portion 12b.

As shown in FIG. 1, the rotary tillage device 2 is a rotary tiller attached to the tilling hook shaft 20 provided on the rear side of the mission case 3 and the tilling hook shaft 20 and driven to rotate. In addition to the tilling hook 21 and the ground resistance bar 22, the tilling rotary cover 23 covering the upper part of the rotary tilling hook 21 and a stop plate 24 are provided. .

[Configuration of Operation Device]

As shown in FIGS. 3 to 7, the single operation lever 4 for operating the PTO clutch 31 and the differential device 30 is the differential device disposed in the mission case 3. PTO clutch operation for interlocking the differential lock operation mechanism for operating 30) in the differential lock state and the differential lock release state through the first linkage mechanism 5 and on / off operation of the PTO clutch 31. The differential device 30 and the PTO clutch are connected to the mechanism through the second linkage mechanism 6 and provided with these operation levers 4, the first linkage mechanism 5 and the second linkage mechanism 6. An operating device for operating (31) is configured.

The operation lever 4 inserts the shaft lever portion 42 into the guide groove 19 formed in the lever guide 18 fixed by welding to the handle lever portion 12a on the right side of the steering wheel 12. It is comprised so that the oscillation operation direction may be guided through.

3 to 7, the first linkage mechanism 5 is U-shaped, which is fixed by welding to the lower side of the handle lever portion 12a on the right side of the steering wheel 12. The differential operating body which is rotatably mounted with respect to the bracket 32 by the pivot support shaft 35 which is inserted in the pivot support hole 34a, 34a formed in this mounting bracket 32, and is detachably mounted. A crescent shaped lever whose one end side is rotatably connected to the 50 and its differential operating body 50 through a connecting pin 54a welded and fixed to the operating arm portion 54 that is part of the differential operating body 50. And 56, and the operation wire 57 connected to the other end side of the crescent lever 56 via the latch 57a which can be rotated relative to the other end side.

The second linkage mechanism 6 includes a PTO operating body 60 rotatably mounted with respect to the pivot support shaft 35 supporting the differential operating body 50, and the PTO operating body 60. It is comprised including the operation wire 64 connected via the latch 64a which can be relatively rotatable.

The operation lever 4 detachably attaches the support point shaft 40 in a direction orthogonal to the pivot support shaft 35 with respect to the PTO operating body 60 of the second linkage mechanism 6. And the boss portion 41 is rotatably externally fitted to the support point shaft 40.

The U-shaped mounting bracket 32 fixed to the steering wheel 12, as shown in Figs. 3 and 5 to 7, the upper end side of the front wall 33, the handle lever portion ( Pivot support holes 34a and 34a which are fixed to the peripheral surface on the lower half side of 12a) and formed in each of the left and right side walls 34 and 34 extending rearward from the left and right sides of the front wall 33. The pivot support shaft 35 is inserted into and supported. The pivot support shaft 35 is comprised by the pin with a head, and is comprised so that the other end side may be stuck by the washer 35a and the R pin 35b in the fall prevention state.

As shown in FIGS. 5 to 7, the differential operation body 50 is formed in a U-shape in which the left side plate 51 and the right side plate 52 are connected by a bottom plate 53. Pivot support holes 51a and 52a through which the pivot support shaft 35 can be inserted are formed in lower portions of the left side plate 51 and the right side plate 52, respectively.

The lower part which formed the said pivot support hole 51a, 52a of this differential operating body 50 entered in between the side wall 34, 34 of right and left of the said mounting bracket 32 comrades, The support shaft 35 has a pivot support hole 34a, 34a formed in each of the left and right sidewalls 34, 34 of the mounting bracket 32 and the left side plate 51 and the right side plate 52 of the differential operating body 50. Is mounted so as to penetrate each of the pivot support holes 51a and 52a formed in the cross-section. Therefore, in this mounting state, the left side plate 51 and the right side plate 52 of the differential operating body 50 are rotated while being guided by slidingly contacting the inward surfaces of the side walls 34 and 34 on the left and right sides of the mounting bracket 32. It is possibly in a supported state.

The operation arm part 54 extended toward the rear side and the lever linkage part 55 extended toward the upper side are integrally formed in the left side plate 51 of the said differential operating body 50. As shown in FIG.

The said operation arm part 54 is connected and fixed to the extension pin side by the connecting pin 54a, and is connected so that the rear end side of the crescent-shaped lever 56 can be detachably connected to this connection pin 54a. have.

The lever linkage part 55 bends a bifurcated branch formed on the upper end side to the left side, so that a pair of front and rear coupling protrusions 55a and 55b projecting to the left side from the lower side of the left side plate 51 are formed. It is. As shown in Figs. 6 and 7, the pair of front and rear coupling protrusions 55a and 55b extends further to the left beyond the side wall 34 on the left side of the mounting bracket 32, and the PTO operation is performed. The shaft lever portion 42 of the operation lever 4 supported by the sieve 60 is formed at intervals slightly larger than the shaft diameter of the shaft lever portion 42 so that the shaft lever portion 42 can be inserted back and forth.

The PTO operating body 60 has a U-shape for mounting a mounting boss portion 61 rotatably externally fitted with respect to the pivot support shaft 35 and a support point shaft 40 of the operating lever 4. The lever holding portion 62 and the swinging arm portion 63 extending rearward from the lever holding portion 62 are integrally formed.

The PTO operating body 60 is disposed on the left side of the side wall 34 on the left side of the mounting bracket 32, and the pivot support shaft 35 is inserted with respect to the mounting boss portion 61, and the pivot support shaft ( By fixing in the fall prevention state using the washer 35a and the R pin 35b at the shaft end side of the shaft 35, the pivot support shaft 35 is brought into sliding contact with the side wall 34 on the left side of the mounting bracket 32. Is rotatably supported around the shaft center p1.

As shown in FIGS. 5 to 7, the U-shaped lever holding portion 62 to which the operation lever 4 is mounted has the bottom plate portion 62a on the upper side of the outer circumferential surface of the mounting boss portion 61. It is formed in a U shape by the front plate part 62b standing by the front side of the bottom plate part 62a, and the back plate part 62c standing up by the back side, and being fixed by welding, and a front plate part 62b. ) And the support point shaft 40 penetrated through the back plate portion 62c to swing the operation lever 4 side to side around the axis p2 in the front-rear direction. The support point shaft 40 is constituted by a pin with a head, and the other end side is configured to be secured in a preventive state by the washer 40a and the R pin 40b.

The swinging arm portion 63 extends from the left end of the rear plate portion 62c toward the rear side, and the latch 64a attached to the operation wire 64 near the rear end of the swinging arm portion 63. ), A coupling hole 63a is formed.

In addition, the swinging arm portion 63 includes a stopper pin as a means for avoiding the impact of the shaft lever portion 42 of the operation lever 4 from impacting the end of the guide groove 19 of the lever guide 18. 65 is welded and fixed integrally. The function of this stopper pin 65 is mentioned later.

As shown in FIGS. 3 to 7, the operation lever 4 includes a gripping portion 43 on the upper end side of the shaft lever portion 42, and is external to the support point shaft 40 on the lower end side. It is provided with the boss part 41 to be fitted, and is comprised so that left-right oscillation is possible around the front-rear axial center p2 which is the axial center of the support point shaft 40.

On the outer circumferential side of the boss portion 41, the operation lever 4 is moved in the right direction (the paper in FIG. 6) between the shaft lever portion 42 and the back plate portion 62c of the PTO operating body 60. A coil spring 44 (corresponding to a resistance means) that swings and presses so as to tilt in the right direction] is provided.

As shown in FIG. 3, the steering wheel 12 is bent part 12d so that the angle of rear upward inclination becomes gentle near the rear part of the handle lever part 12a of the right side extended toward the inclination rear upper side. The front end portion 18F of the lever guide 18 is welded and fixed along the inclined upper edge portion of the handle lever portion 12a on the front side of the bent portion 12d. The rear half 18R of the lever guide 18 is inclined with respect to the first half 18F so as to follow the handle lever portion 12a on the rear side of the bent portion 12d from a slightly front side of the bent portion 12d. The angle is curved to be gentle.

As shown in FIG. 4, the lever guide 18 has a right edge of the first half 18F along the upper edge of the right handle lever portion 12a, and a rear half 18R of the right handle as shown in FIG. 4. It is formed so as to follow the horizontal side edge of the inside of the lever part 12a, and the left edge is formed linearly along the gas front-back direction. When the guide groove 19 is formed at a position near the left side of the first half 18F of the lever guide 18, and the engine 11 is urgently stopped at a position near the right side of the guide groove 19. The stop button 11a to be used is arrange | positioned in the state which shifted the position with respect to the said guide groove 19 in the left-right direction.

This operation lever 4 is a shaft lever part in the guide groove 19 formed in the front part 18F of the lever guide 18 fixed by welding to the handle lever part 12a of the right side of the said steering wheel 12. The right direction pushed by the coil spring 44 is inserted into the shaft 42, and the shaft lever portion 42 of the operation lever 4 is positioned on the upper end side of the differential operating body 50. As shown in FIG. It is a direction which is caught between a pair of front and rear coupling protrusions 55a and 55b of the formed lever linkage part 55, and among the operation paths of the guide groove 19 shown in FIG. 4), and serves as resistance means for imparting resistance to movement from the straight path a side to the bend path b side described later.

In the guide groove 19 formed in the first half 18F of the lever guide 18, as shown in Fig. 8, the non-working traveling position s1 which is an operating position in which the PTO clutch 31 is off and the differential lock is released; 3 operating positions of the differential lock non-working position s2 which is the operating position which operated the PTO clutch 31 off in the differential lock state, and the operating position s3 which is the operating position which operated the PTO clutch 31 on and operated in the differential lock state. Is set.

The part of the guide groove 19 between the non-working traveling position s1 and the differential lock non-working position s2 is constituted by a straight path a, and the guide groove 19 between the differential lock non-working position s2 and the working position s3. The part of is comprised by the bending path b.

Moreover, the said bending path | route b is the horizontal movement path | route part b1 which goes inclined lateral direction from the said differential lock non-working position s2, and the forward-backward movement path | route part b2 which goes to the said working position s3 from the terminal part of the said horizontal movement path | route part b1. It is formed in a path bent in an L shape by the combination of.

The lateral movement path portion b1 of the bending path b is provided with resistance to movement to the bending path b side of the operating lever 4 located at the differential lock non-working position s2 near the entrance of the lateral movement path portion b1. Among the groove edges on the right side of the guide groove 19, the resistance protrusion 19a (corresponding to the resistance means) in which the groove edge located at the front side of the body in the lateral movement path portion b1 partially expands toward the rear side of the body is Formed.

Moreover, among the groove edges on the left side of the said guide groove 19, the groove edge which is located in the back side of the base | substrate facing the groove edge of the right side which provided the said resistance projection 19a of the said lateral movement path part b1 is a guide groove. The rear part is located on the right side of the body, and the front side is located on the front left side of the body so that the front end of the straight path a of (19) and the rear end of the forward and backward movement path part b2 of the bending path b are smoothly connected. It is formed by the curved guide part 19b which has the inclination part toward the inclination left front.

[Operation of operation device]

The operation mode in the case of operating the differential device 30 and the PTO clutch 31 by the said operation lever 4 is demonstrated based on FIGS. 8-11.

9 shows a state where the operation lever 4 is positioned at the non-work traveling position s1. In this non-working traveling position s1, the lever linkage portion between the front and rear pairs of engaging projections 55a and 55b formed on the upper end side of the differential operating body 50 by the shaft lever portion 42 of the operation lever 4 ( 55, the shaft lever portion 42 contacts the rear end side of the guide groove 19 formed in the lever guide 18, and rotation to the rear side (clockwise in FIG. 9) is prevented. have.

At this time, the connecting pin 54a of the differential operating body 50 and the connection point p3 on one end side of the crescent-shaped lever 56 and the engaging hole 63a of the swinging arm part 63 of the PTO operating body 60 are caught. The connection point p4 of the latch 64a has a fixed holding point x2 of each of the operation wires 57 and 64 associated with the differential lock operation mechanism and the PTO clutch operation mechanism, and the shaft center p1 of the pivot support shaft 35. It is located below the dead point line DP to connect.

In this position, the operation wire 57 associated with the differential lock operation mechanism is loosened, and the differential device 30 is in the differential lock release state where the differential lock is released, and the operation wire 64 associated with the PTO clutch operation mechanism is PTO. Since the clutch 31 is spring-pressed to the clutch on side, a pull action is applied to the clutch on side, but since the operation lever 4 is pushed toward the rear end side of the guide groove 19 to prevent clockwise rotation, the clutch It is a non-working state where it is maintained in the OFF state and the drive of the rotary tillage device 2 which is a working device was stopped.

FIG. 10 shows a state where the operation lever 4 is positioned at the differential lock non-working position s2.

In this differential lock non-working position s2, the shaft lever part 42 of the operation lever 4 is in the state latched into the said lever link part 55, and the operation lever 4 is the guide groove formed in the lever guide 18. As shown in FIG. The shaft lever portion 42 is positioned near the front end position of the straight path a of 19, and further rotation to the front side (counterclockwise in FIG. 10) is prevented.

At this time, the connecting pin 54a of the differential operating body 50 and the connection point p3 on one end side of the crescent-shaped lever 56 and the engaging hole 63a of the swinging arm part 63 of the PTO operating body 60 are caught. The connection point p4 of the latch 64a connects the fixed holding point x2 of each of the operation wires 57 and 64 connected with the differential lock operation mechanism and the clutch operation mechanism, and the shaft center p1 of the pivot support shaft 35. It is located above the dead point line DP.

In this position, the operation wire 57 connected to the differential lock operation mechanism is pulled, and the upper end portion of the differential operation body 50 comes into contact with the rear surface side of the front wall 33 of the mounting bracket 32, thereby providing more than differential operation. By preventing the counterclockwise rotation of the operating body 50, the front side of the operating lever 4, that is, the counterclockwise rotation is also prevented, and the shaft lever portion 42 of the operating lever 4 is guided ( Rotation to the front side is prevented in the state which is not in direct contact with the front-end | tip part of the straight path a of 19).

Although the connection point p4 moves to the upper side of the dead point line DP, the operation wire 64 connected to the said PTO clutch operation mechanism has the distance from the fixed holding location x2 of the operation wire 64 to the said non-working travel position s1. It is hardly changed from the state where it was located, it is kept in the clutch off state, and the drive of the rotary tillage device 2 which is a working device is maintained in the stopped non-working state.

However, when the connection point p4 moves to the upper side of the dead point line DP, the spring pressing force toward the clutch on side of the PTO clutch 31 causes the operation lever 4 to move to the front end side of the straight path a of the guide groove 19. Since the counterclockwise rotation of the operating lever 4 is prevented by contact with the front wall 33 of the mounting bracket 32, it is operated in the differential lock non-working position s2. The position of the operation lever 4 is kept stably.

11 illustrates a state where the operation lever 4 is positioned at the work position s3. In this working position s3, the differential operating body 50 is in contact with the rear surface side of the front wall 33 of the mounting bracket 32, and only the operating lever 4 is a guide formed in the lever guide 18. It moves to the position of the front-end | tip part of the groove | channel 19, and further rotation to the front side (counterclockwise direction in FIG. 11) is inhibited.

Thus, in order to move the operation lever 4 to the working position s3, as shown in FIG. 8, the operation lever 4 which was located in the differential lock non-working position s2 resists the pressing force of the coil spring 44, and Furthermore, it is necessary to move beyond the resistance protrusion 19a near the entrance of the bending path b of the guide groove 19 to the front end side of the bending path b which is composed of a combination of the lateral movement path portion b1 and the forward and backward movement path portion b2. There is. Therefore, when the said operation lever 4 is moved laterally toward the horizontal movement path part b1, the axial lever part 42 of the operation lever 4 will move from the lever linkage part 55 of the differential operating body 50. FIG. When exiting and afterwards operating the operating lever 4 to the front side, only the PTO operating body 60 is rotated counterclockwise around the axial center p1 of the pivot support shaft 35. As shown in FIG.

At this time, the spring pressing force on the clutch on side of the PTO clutch 31 acts on the PTO operating body 60 in the direction in which the operating lever 4 is pressed toward the front end side of the bending path b of the guide groove 19. When the operation lever 4 reaches the working position s3, the stopper pin 65 which is integrally provided to the swinging arm portion 63 of the PTO operating body 60 is the front wall 33 of the mounting bracket 32. ) Contact with the upper end portion of the rear side of the differential operating body 50 whose movement is inhibited by contact with the upper side, and further rotation to the front side (counterclockwise in FIG. 11) is prevented, and the operation lever 4 The shaft lever portion 42 is configured to prevent rotation to the front side before contacting the front end portion of the bending path b.

As for the said operation lever 4, the position of the holding part 43 in each operation position of the non-working traveling position s1, the differential lock non-working position s2, and the working position s3 is the said speed change, as shown in FIG. Regarding the operation lever 17, the shift operation lever 17 is located at the front side at the work position s3 and the differential lock non-working position s2, rather than the rear end of the gripper of the shift operation lever 17. The holding part 43 of the operation lever 4 is located in the rear side rather than the rear end of the holding part.

And about the clutch lever 15 for operating the main clutch 14 on and off, as shown to FIG. 1 and FIG. 3, the said non-working traveling position s1, the differential lock non-working position s2, and the working position s3, respectively. In the operating position, the gripping portion 43 of the operating lever 4 is located on the front side than the operating range of the clutch lever 15, and the gripping portion 43 of the operating lever 4 is located at the rearmost side. In the work travel position s1, the clutch lever 15 is in a posture along the standing direction of the clutch lever 15 in the clutch off position standing up relative to the handle lever portion 12a on the right side of the steering wheel 12.

[Other Embodiment 1]

In the above-described embodiment, an example in which the transmission mechanism of the traveling system and the transmission mechanism of the working system is used as the transmission case is shown, but the present invention is not limited thereto. For example, the traveling system Power transmission mechanism and work system transmission mechanism may be incorporated in each transmission case. The other structure may employ | adopt the same structure as the above-mentioned embodiment.

[Other Embodiment 2]

In the above-described embodiment, the operation position s3 is provided on the front side of the body in the operation path of the operation lever 4, and then the differential lock non-working position s2 is provided, and the non-working travel position s1 is set thereafter. Although not limited to this, for example, the non-working travel position s1 may be provided on the front side of the body, then the differential lock non-working position s2 may be provided, and the working position s3 may be set thereafter. The other structure may employ | adopt the same structure as the above-mentioned embodiment.

[Other Embodiment 3]

Although the above-mentioned embodiment demonstrated the thing of the structure which provided the operation lever 4 and the lever guide 18 in the handle lever part 12a of the right side of the steering wheel 12, It is not limited to this, The steering wheel It may be of a structure equipped with the handle lever portion 12a on the left side of (12). Moreover, also when the guide groove 19 formed in the lever guide 18 is equipped with the handle lever part 12a of either the left and right sides of the steering wheel 12, the said operation lever 4 and the lever guide 18 are also equipped. Alternatively, the bending path b is not limited to the formation of the bending path b on the left side of the straight path a, and the bending path b may be formed on the right side of the straight path a. The other structure may employ | adopt the same structure as the above-mentioned embodiment.

[Other Embodiment 4]

In the above-described embodiment, the differential lock operation mechanism and the PTO clutch 31 of the differential device 30 are controlled using the operation wire 57 and the operation wire 64 in the operation position of the operation lever 4. Although it was shown that it was comprised so that mechanical transmission may be carried out to the PTO clutch operation mechanism of this, it is not limited to this, For example, the operation position in the operation path of the operation lever 4 is electrically detected by a switch, a potentiometer, etc., The differential lock operation mechanism of the differential device 30 and the PTO clutch operation mechanism of the PTO clutch 31 are configured to be electrically controlled by a mechanism driven by an electric motor or a hydraulic device controlled by a solenoid valve. Also good. The other structure may employ | adopt the same structure as the above-mentioned embodiment.

The operating device of the work machine in the present invention is not limited to a walking type tiller, and can be applied to various work machines as long as the work device includes a differential device and a PTO clutch, such as a passenger tillage machine and a Munnon work machine.

2: work device (rotary tillage device)
4: Operation lever
11: Engine
13 driving device (driving wheel)
19a: resistance means (resistance protrusion)
30: differential device
31: PTO Clutch
44: resistance means (coil spring)
a: straight path
b: winding path
b1: Lateral travel path portion
s1: non-working driving position
s2: differential lock non-working position
s3: working position

Claims (4)

It is an operating device of the work machine provided with the traveling system transmission mechanism which transmits the transmission power from the engine side to the traveling apparatus side, and the work system transmission mechanism which transmits to the working apparatus side,
A differential device is provided in the traveling system transmission mechanism, and a PTO clutch is provided in the work system transmission mechanism to control power transmission to the working apparatus side.
A single operation lever associated with the differential device and the PTO clutch, a work position for turning on the PTO clutch in a differential lock state, a non-working driving position for turning off the PTO clutch in a differential lock release state, and in a differential lock state. The operation device of the work machine, characterized in that the switch is operated so as to be switched to the differential lock non-working position for operating the PTO clutch. The operation path of the said operation lever is the said operation position of Claim 1 via a linear path between the said non-working travel position and the said differential lock non-working position, and the transverse path path part laterally from the said linear path. The operating device of the work machine, which is formed by a bending path leading to it. The operating device of the work machine according to claim 2, wherein the differential lock non-working position is set in the middle of the work position and the non-work traveling position in an operation path of the operation lever. The said PTO clutch is provided by the spring pressurization to the clutch on side, The said operation lever is pressurized toward the said working position side from the said non-working traveling position side by the pressing force to the clutch on side of the said PTO clutch, The operating device of the work machine, wherein the operation lever is provided with resistance means for providing resistance to movement from the straight path side to the bending path side.

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