JP2008213729A - Clutch operating device in walking working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out a clutch disengagement operation with thumb operation of the same hand grasping a clutch main operation lever 15 so as to approach a control portion 6c. <P>SOLUTION: A clutch operating device has a finger operated lever 27 mounted on the clutch main operating lever 15 vertically in a rotatable manner, an unlocking arm 29 integrally installed with the finger operated lever in a rotatable manner, a wire arm connected by a wire 13 and mounted on the clutch main operating lever in a rotatable manner, a lock arm 22 equipped with a locking portion, and a second engagement portion 30 installed in the lock arm to be engaged with and disengaged from the lock portion. By grasping the clutch main operation lever, the finger operated lever is operated in the downward pressing direction keeping separate from the control portion so that the lock arm and the wire arm are disengaged via the unlocking arm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a walking type equipped with a finger operation lever for operating a clutch disengagement operation while holding a clutch main operation lever for turning on and off the power provided on the operation portion of the operation handle. The present invention relates to a clutch operating device in a work machine.

  Conventionally, as shown in the gazette of Patent Document 1, in a walk-type farm work machine such as a management machine or a tiller, the work is often performed while holding the steering handle to balance the machine body. An operation lever of a clutch for transmitting (entering) or shutting off (disconnecting) the power to the wheels and the rotary tillage unit is provided on the steering handle. The steering handle is formed in a loop shape that extends backward from left and right handle bases extending from the body and is connected to a free end by a grip portion extending left and right. A pair of left and right operating levers for engaging and disengaging the clutch are provided with an operating portion that is brought closer to the grip portion at the clutch engaged position and separated from the grip portion at the clutch disengaged position. A non-polymerized portion that does not polymerize at least one of the grip portions is disclosed. According to this configuration, when the operator grasps the non-overlapping portion of the grip portion with one hand and grips the operation portion with the other hand (closes to the grip portion), the clutch is engaged with the pair of operation levers. When it is held and the operation unit is released, the clutch returns from the on state to the disengaged state.

On the other hand, as shown in the publication of Patent Document 2, a main operation lever (first lever) is provided on the steering handle. This first lever is provided on the steering handle with the clutch engagement position and the clutch disengagement position arranged on both sides of the dead point, and the second lever that can be operated with fingers can be operated while holding the steering handle. A second lever provided with a handle is provided with an interlocking mechanism so that the first lever can be swung to swing the clutch so that the clutch can be turned on and off.
JP 2001-63641 A (see FIGS. 1 to 4). Japanese Patent Application Laid-Open No. 11-170885 (see FIGS. 3 and 5 to 7).

  However, in the configuration of Patent Document 1, in order to perform the clutch disengagement, there is a time when the handle is operated with one hand because the finger of the other hand is separated from the operation unit, and the steering of the handle becomes unstable. was there.

  In the configuration of Patent Document 2, the clutch can be turned on and off by operating the second lever by a finger operation of one hand. However, when the second lever swings downward toward the grip portion of the steering handle, Switch from cutting to entering. In this case, the second lever is lowered with a thumb or the like. Conversely, when the second lever is swung upward with a middle finger or the like, the clutch can be switched from on to off. To ensure safety, the lever is operated when the clutch is switched from the engaged state to the disconnected state. When the second lever is operated using the middle finger as described above, the handle grip portion of the handle There was a problem that it was difficult to hold strongly. Further, since the first lever is located at a position far from the grip portion of the steering handle, in order to operate the first lever, the handle is held with only one hand. Therefore, in the headland work in Fukada, where the maneuvering handle is lifted to raise the tillage part to the ground and change direction, and in the work where the maneuvering handle is always pushed down in a dry clay field, etc. The clutch lever could not be easily operated in the middle, and there was a problem that the attitude of the fuselage was easily changed by releasing the hand from the steering handle.

  The present invention provides a clutch operating device for a walk-type work machine, which has been made to solve the above-mentioned problems of the prior art, and has an improved configuration capable of releasing the clutch while holding the steering handle firmly. It is intended to do.

  In order to achieve the above-mentioned object, the present invention provides a clutch operating wire via a clutch operating wire by a gripping operation in a direction approaching the operating unit of a clutch main operating lever mounted on an operating unit of a handle in a walking work machine. In the clutch operating device in an agricultural machine configured to be disengaged when the clutch is engaged and the clutch main operation lever is released, a finger operation lever for clutch disengagement is provided in the vicinity of the clutch main operation lever. Is arranged so as to be rotatable, and an interlocking mechanism is provided between the clutch main operation lever and the finger operation lever, and the interlock mechanism is configured so that the finger operation lever is moved in the grip operation state of the clutch main operation lever. By operating in a downward direction away from the steering portion of the handle, the clutch is disengaged.

  According to a second aspect of the present invention, in the clutch operating device of the walking type working machine according to the first aspect, the interlock mechanism is the finger operating lever mounted on the clutch main operating lever so as to be rotatable up and down. And a lock release arm provided so as to be rotatable integrally with the finger operation lever, a wire arm connected to the wire and rotatably attached to the clutch main operation lever, and a lock portion. A lock arm, and a second engagement portion that is provided on the lock arm and engages / disengages with the lock portion, and the wire arm is engaged with the clutch via the lock arm by a grip operation of the clutch main operation lever. When the clutch main operation lever is released, the engagement between the lock arm and the wire arm is released and the wire main arm is released. An arm is configured to move in a clutch disengagement direction, and is configured to move the finger operation lever in a direction approaching a steering portion of the handle when the clutch main operation lever is gripped. When the finger operation lever is operated in the downward direction away from the control unit, the lock arm and the wire arm are unlocked via the lock release arm, and the clutch is disengaged. It is comprised so that it may become.

  According to a third aspect of the present invention, in the clutch operating device of the walking type working machine according to the second aspect, the lock arm is spring-biased in a direction of locking engagement with the wire arm, The lock release arm includes a second engagement portion that engages and disengages with respect to the wire arm, and the lock arm is disposed between the clutch main operation lever and the finger operation lever or the lock release arm with respect to the wire arm. A biasing means for biasing the unlocking arm in the locking direction is provided.

  According to a fourth aspect of the present invention, in the clutch operating device of the walking type working machine according to the first aspect, the interlock mechanism is configured such that the unlocking arm that rotates integrally with the finger operating lever and the wire are connected. A wire arm and a lock arm connected to the wire arm, and further provided to the clutch main operation lever, and a first engagement portion in the lock arm and a second engagement in the lock release arm. A lock part that engages with and disengages from the coupling part, and a first spring that is provided on the lock arm and is urged so that the first engagement part is locked and engaged with the lock part of the clutch main operation lever. It is mounted between the biasing means and the lock arm and the finger operation lever or the unlock arm, and the unlock arm is locked in the locking direction with respect to the lock part. A second spring biasing means for biasing, and when the clutch main operation lever is gripped, the lock arm and the lock release arm integrally rotate in the forward direction, and the wire arm is moved in the clutch engagement direction. When the clutch main operation lever is released, the lock arm and the lock release arm rotate together in the opposite direction, and the wire arm rotates in the clutch disengagement direction. In the grip operation state of the clutch main operation lever, by operating the finger operation lever in a downward direction away from the control unit, the lock arm is moved through the lock release arm. The lock of the operating lever with the lock portion is released, and the clutch is disengaged.

  According to the first aspect of the present invention, the clutch main operation lever for operating the clutch to be turned on and off while holding the handle with both hands is used as a grip portion of the steering handle with a plurality of fingers other than the thumb of at least one hand. If the clutch is operated so as to be close to the clutch, the clutch is engaged (ON), and if the clutch main operation lever is released, the clutch is disengaged (OFF). With the gripped state, the finger operating lever provided adjacent to the clutch main operating lever can be easily disconnected using the thumb of the one hand.

  According to the invention described in claim 2, the interlocking mechanism is provided so as to be rotatable integrally with the finger operation lever, the finger operation lever mounted on the clutch main operation lever so as to be rotatable up and down. A lock release arm; a wire arm connected to the wire and rotatably attached to the clutch main operation lever; a lock arm having a lock portion; and a lock arm provided on the lock arm to be engaged with and disengaged from the lock portion. A second engagement portion that engages the wire arm so as to move in the clutch engagement direction via the lock arm by a grip operation of the clutch main operation lever, while the clutch main operation lever When the grip is released, the engagement between the lock arm and the wire arm is released, and the wire arm moves in the clutch disengagement direction. When the main operation lever is gripped, the finger operation lever is configured to move in a direction approaching the steering portion of the handle. When the clutch main operation lever is gripped, the finger operation lever is moved from the control portion. By operating in the downward direction to be separated, the lock arm and the wire arm are unlocked via the lock release arm, and the clutch is disengaged. In addition to the effects of the invention described in the above, the clutch operating operation can be easily performed with the hand supporting the handle by operating the finger operation lever with the thumb while holding the operation portion of the handle with the finger and palm except the thumb. Therefore, it is possible to easily reduce the operation stroke of the finger operation lever that changes the clutch to ON / OFF with the hand holding the handle and also to prevent the aircraft from wobbling. It is what you get strive to.

  According to a third aspect of the present invention, the lock arm is spring-biased in a direction of locking engagement with the wire arm, and the lock release arm is engaged and disengaged with respect to the wire arm. A biasing means for biasing the unlocking arm in the locking direction with respect to the wire arm between the clutch main operating lever and the finger operating lever or the unlocking arm. Therefore, the clutch can be disengaged by a simple operation of operating the finger operation lever against the urging force of the urging means.

  According to a fourth aspect of the present invention, the interlock mechanism includes a lock release arm that rotates integrally with the finger operation lever, a wire arm that is connected to the wire, and a lock that is connected to the wire arm. A lock portion that is provided on the clutch main operation lever and engages / disengages with respect to the first engagement portion of the lock arm and the second engagement portion of the lock release arm, and A first spring biasing means provided on a lock arm and biased so that the first engagement portion is locked and engaged with the lock portion of the clutch main operation lever; and the lock arm and the finger operation lever or A second spring biasing means mounted between the unlocking arm and biasing the unlocking arm in the locking direction with respect to the lock portion, When the lever is gripped, the lock arm and the unlock arm are integrally rotated in the forward direction and the wire arm is rotated in the clutch engagement direction, and the clutch main operation lever is gripped. When the release operation is performed, the lock arm and the lock release arm integrally rotate in the opposite direction, and the wire arm is configured to rotate in the clutch disengagement direction. By operating the finger operation lever in a downward direction away from the control unit, the lock arm is released from the lock portion of the clutch main operation lever via the lock release arm, and the clutch is disengaged. It is comprised so that it may become.

  Therefore, when plowing, etc., you can hold the clutch main control lever and the handle control part with your hand, and simply press the finger control lever down with your thumb. Since the clutch can be disengaged, there is an effect that the maneuvering handle can be continuously stabilized without releasing the maneuvering handle at any time, and the clutch disengaging operation can be quickly performed in an emergency.

  Preferred embodiments for carrying out the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side perspective view of the entire management machine, FIGS. 2 to 6 are diagrams illustrating a first embodiment, and FIGS. 7 to 10 are diagrams illustrating a second embodiment.

  A management machine 1 as an agricultural working machine (walking type working machine) to which the present invention is applied has an intermediate front side of a transmission case 4 integrally connected to a rear end of a chassis 2 on which an engine 3 is mounted. A pair of left and right traveling wheels 5 are pivotally supported on the vehicle axle, and the base end portion of the steering handle 6 is fixed to the left and right sides of the transmission case 4. The steering handle 6 is formed in a substantially U shape in a plan view formed by connecting rear ends of a pair of handle rods 6a extending rearward and upward with a coupling rod 6b extending in the left-right direction.

  A tilling case 7 extending rearward is provided at the rear part of the mission case 4, and a tilling rotary 8 is disposed below the tilling case 7. Power is transmitted from the PTO shaft of the mission case 4 to the tilling rotary 8 through a chain case (not shown). Is done. A tail wheel 10 for controlling the depth of tilling by the rotary cover 9 and the tilling rotary 8 is provided at the rear part of the tilling case 7. Reference numeral 11 denotes a fuel tank.

  Further, power is transmitted from an output shaft protruding from one side (not shown in FIG. 1) of the engine 3 to an input shaft on the same side of the mission case 4 via a pulley and a belt. A conventionally known belt tension type clutch is disposed between the output shaft and the input shaft. That is, the tension pulley is rotatably supported by the clutch arm, and this clutch arm is connected to the clutch operating device 12 via a clutch operating wire 13 described later. When the tension pulley presses the outer periphery of the belt to increase the belt tension, power transmission (with a clutch) occurs, and when the tension pulley moves away from the outer periphery of the belt and the belt tension loosens, the power transmission to the input shaft Is a configuration in which is disconnected (clutch disengagement). The clutch device may be incorporated into a V-belt continuously variable transmission mechanism in addition to the above configuration.

  Next, the configuration of the clutch operating device 12 of the first embodiment will be described in detail. As shown in FIGS. 1 to 6, a mounting plate 14 is fixed in the vicinity of the steering portion 6 c, which is the rear portion of the left handle rod 6 a in the steering handle 6, so as to extend downward. A base end portion 15 a of the clutch main operation lever 15 is pivotally supported by the mounting plate 14 via a main support shaft 16 so as to be rotatable up and down. In this case, the main support shaft 16 is substantially orthogonal to the axis of the round pipe-shaped control unit 6c and is disposed below the control unit 6c. Therefore, the grip portion 15b of the clutch main operation lever 15 is provided so as to approach and separate from the lower surface of the round pipe-shaped control portion 6c.

  Further, the base end portion 15a of the clutch main operation lever 15 has two parallel plate members 17 on the left and right sides, and the opening between the two plate members 17 and 17 is opened in the front and upper directions. (See FIGS. 5 and 6).

  Between the two plate members 17, 17, a wire arm 19 having a substantially rectangular frame shape is pivotally supported by the main support shaft 16 in a side view, and is drilled in a lower portion of the front surface of the wire arm 19. The proximal end of the wire 13 is connected to the shaft 21 through the provided window hole 20.

  A plate-like lock arm 22 is pivotally supported with respect to the mounting plate 14 via a second support shaft 23 at a position forward of the base end portion 15 a of the clutch main operation lever 15. A downwardly hooked first engaging portion 24 is formed in the upper portion of the lock arm 22 by a notch. Between the lock arm 22 and the mounting plate 14, a first spring urging means 25 using a tension spring type spring or the like is mounted. With this first spring biasing means 25, the lock arm 22 rotates counterclockwise in FIG. 3, and the first engagement portion 24 is locked to a lock portion 26 fixed or formed on the upper end of the wire arm 19. It is urged to engage (see FIG. 3).

  A pivot portion 27a of a finger operation lever 27 is supported on the base end portion 15a of the clutch main operation lever 15 so as to be rotatable in parallel with the main support shaft 16, and is a plate-like shape fixed to the pivot portion 27a. An unlocking arm 29 is arranged in parallel with one plate member 17 of the clutch main operation lever 15. In the embodiment, since the clutch operating device 12 is provided on the left handle bar 6a of the management machine 1, the finger operating lever 27 to be pressed downward with the thumb of the left hand of the operator is provided on the left handle bar 6a. Is extended rearward on the right side of the outer periphery of the control portion 6c. Further, the finger operation lever with the thumb in the state where the grip portion 15b of the clutch main operation lever 15 is gripped so that the palm of the left hand of the operator and a plurality of fingers other than the thumb approach the lower surface of the control portion 6c. The grip part 15b and the operation part 27b are arranged as close as possible in the axial direction of the control part 6c so that the 27 operation parts 27b can be pressed downward.

  A second engaging portion 30, which is a downwardly open concave portion formed on the lower surface side of the unlocking arm 29, is such that one end of the round shaft 21 in the wire arm 19 protrudes in the opposite direction to the mounting plate 14. It is comprised so that it may engage / disengage to the stop part 21a. In addition, you may provide the latching | locking part 21a in a different place with the axis | shaft 21 separately.

  Between the unlocking arm 29 and the clutch main operating lever 15, a second spring urging means 31 is mounted by a tension spring type spring or the like. With this second spring urging means 31, the unlocking arm 29 is rotated clockwise in FIG. 3 so that the second engagement portion 30 is engaged with the engagement portion 21a from above. It is energized.

  The mounting plate 14 is provided with a stopper pin 32 for restricting the rotation angle (inclination angle) of the wire arm 19 when the clutch is disengaged (OFF) so as not to rotate further. Yes.

  On the other hand, the lock arm 22 is provided with an abutting action portion 33 that is bent from the plate-like main body portion and extends from the top end portion of the unlocking arm 29 so as to face the portion. With this configuration, when the operation part b of the finger operation lever 27 is pushed downward and turned, when the unlocking arm 29 turns in the unlocking direction (counterclockwise as shown in FIG. 4, upward), the contact acting part Hit 33. When further rotated, the lock arm 22 is forcibly rotated via the abutting action portion 33 in the direction (clockwise direction) in which the first engagement portion 24 is disengaged (unlocked) from the lock portion 26 of the wire arm 19. It is something to move.

  In addition, when the sensor 34 such as a limit switch is provided on the mounting plate 14 and the first engagement portion 24 of the lock arm 22 is engaged with the lock portion 26 of the wire arm 19, the lock plate 22 faces sideways. The to-be-detected part 35 projecting from the sensor hits the detecting part 34a of the sensor 34 and outputs an ON signal. When the first engagement part 24 is disengaged from the lock part 26 (disengagement), the detected part 35 is separated from the detection part 34a and outputs an OFF signal.

  The clutch engagement (ON) and disengagement (OFF) operations with the above configuration will be described in detail. When the operator drives the engine 3 of the management machine 1, as shown in FIG. 2, first, the operator's left hand is separated from the clutch main operation lever 15. In this state, the tension roller at the tip of the clutch arm (not shown) is separated from the belt by the biasing spring in the clutch device, and the clutch is disconnected. The wire 13 connected to the clutch arm is assumed to be constantly urged in the direction of arrow A in FIG. When the hand is released from the clutch main operation lever 15 and the finger operation lever 27, the wire arm 19 is rotated counterclockwise about the main support shaft 16 by the pulling force of the wire 13 in the arrow A direction. External force is given.

  At this time, since the second engaging portion 30 of the unlocking arm 29 biased by the second spring means 31 to the clutch main operating lever 15 is engaged with the locking portion 21a of the wire arm 19, Similarly, the distal end side of the release arm 29 also rotates counterclockwise about the main spindle 16. Then, the abutting action portion 33 is pushed upward on the top surface on the front end side of the lock release arm 29, and the lock arm 22 rotates around the second support shaft 23 in a clockwise direction against the urging force of the first urging spring means 25. It rotates in the turning direction.

  Accordingly, when the first engagement portion 24 of the lock arm 22 is disengaged from the lock portion 26 of the wire arm 19, the grip portion 15b of the clutch main operation lever 15 and the operation portion 27b of the finger operation lever 27 are operated as the control portion of the handle bar 6a. It is lowered to a state of being largely separated from the lower surface of 6c (see FIG. 2). The posture of FIG. 2 is a normal state of clutch disconnection. The urging force of the second spring means 31 is set to be larger than the urging force of the first urging spring means 25.

  Next, when the operator engages the clutch, the thumb of the left hand presses the upper surface of the control portion 6c of the left handle rod 6a, while the grip portion 15b of the clutch main operation lever 15 is held in a plurality of positions other than the thumb of the left hand. By grasping with a finger (index finger to little finger), the grip portion 15b is brought close to the lower surface of the control portion 6c of the handle rod 6a.

  Then, since the lock release arm 29 is biased by the second spring means 31 in a state where the second engagement portion 30 is engaged with the locking portion 21a of the wire arm 19, the wire arm 19 is also rotated clockwise. 3 and pulls the wire 13 in the direction of arrow B in FIG. 3, and the clutch is turned on. At this time, the upper surface on the distal end side of the unlocking arm 29 is separated from the contact acting portion 33, and the lock arm 22 is rotated counterclockwise in FIG. 3 by the biasing force of the first biasing spring means 25. Therefore, the first engagement portion 24 in the lock arm 22 can engage with the lock portion 26 of the wire arm 19 from above.

  From this state, if a plurality of fingers other than the thumb of the operator's left hand (index finger to little finger) are released from the grip portion 15b, the state returns to the state of FIG. 2 and the clutch disengagement operation is possible.

  In addition, with the thumb and palm of the left hand, the upper surface of the control part 6c of the left handle bar 6a is pressed, while the grip part 15b of the clutch main operation lever 15 is held by a plurality of fingers other than the thumb of the left hand (index finger to little finger). The clutch can be disengaged with the following operation by grasping it.

  That is, as shown in FIG. 4, with the grip portion 15b held close to the lower surface of the control portion 6c, the operation portion 27b of the finger operation lever 27 is lowered downward through the side of the control portion 6c with the thumb of the left hand. Then, the unlocking arm 29 that rotates integrally with the finger operation lever 27 rotates counterclockwise, and the second engagement portion 30 is disengaged from the locking portion 21 a of the wire arm 19. At a slightly later timing, the abutting action portion 33 is pushed upward on the top surface of the distal end side of the lock release arm 29. As a result, the lock arm 22 rotates clockwise against the urging force of the first urging spring means 25, and the first engagement portion 24 comes out of the lock portion 26 of the wire arm 19 upward and locks. It can be canceled. Then, the wire 13 having a tensile force in the direction of arrow A rotates the wire arm 19 about the main support shaft 16 counterclockwise, and the clutch is disengaged.

  In this way, during the tilling work, the finger operating lever 27 is pushed down with the thumb of the gripped hand while holding the clutch main operating lever 15 and the operating portion 6a of the operating handle 6 with the hand. Since the clutch can be disconnected by simply operating it, the steering handle 6 can be continuously stabilized without removing the steering handle 6 from the hand, and the clutch can be quickly operated in an emergency. There is an effect that can be done.

  7 to 10 show a second embodiment of the clutch operating device 38, and a mounting plate 39 is fixed in the vicinity of the steering portion 6c, which is the rear portion of the left handle rod 6a of the steering handle 6, so as to extend downward. A base end portion 40a of the clutch main operation lever 40 is pivotally supported on the mounting plate 39 via a main support shaft 41 so as to be vertically rotatable. In this case, the main support shaft 41 is substantially orthogonal to the axis of the round pipe-shaped control unit 6c and is disposed below the control unit 6c. Therefore, the grip portion 40b of the clutch main operation lever 40 is provided so as to approach and separate from the lower surface of the round pipe-shaped control portion 6c. 7A is a perspective view seen from the left side of the clutch operating device 38, and FIG. 7B is a perspective view seen from the right side, showing a normal clutch disengaged state.

  Between the one side plate of the portion near the base portion of the clutch main operation lever 40 and the mounting plate 39, a front and rear halfway portion of a plate-like lock arm 42 is pivotally supported via the main support shaft 41 so as to be vertically rotatable. . The wire arm 43 is pivotally supported by the mounting plate 39 via a support shaft 44 so as to be able to turn back and forth. A guide pin 45 projecting sideways of the wire arm 43 is fitted into a longitudinal guide groove 46 formed in the front end side (front side) of the lock arm 42. Further, the base end of the bending plate 49 is connected to be pivotable up and down via a pivot 47 provided on the upper portion of the wire arm 43, and is connected to the distal end side (front end) of the bending plate 49 through a rotatable pin 49 a. Thus, the proximal end of the clutch wire 50 is connected.

  The outer pipe 51 of the wire 50 is connected to the tip piece of the mounting plate 39. In the second embodiment, the curved plate 49 and the wire arm 43 are collectively referred to as a wire arm.

  On the side surface of the clutch main operation lever 40, a round shaft 52 serving as an engaged portion (locking portion) is provided in a laterally protruding manner at a portion closer to the rear side than the main support shaft 41. The round shaft 52 is located on the lock arm 42 arrangement side and on the upper surface side of the lock arm 42. On the upper surface of the lock arm 42, an upward hook-shaped first engagement portion 53 is formed by notching.

  Between the lock arm 42 and the mounting plate 39, a first spring biasing means 57 is mounted by a torsion spring or the like loosely fitted on the outer periphery of the main support shaft 41. The first spring urging means 57 urges the lock arm 42 to rotate clockwise in FIG. 7B. That is, the lock arm 42 rotates counterclockwise in FIG. Accordingly, the first engagement portion 24 is biased so as to be locked and engaged with the round shaft 52 that is a lock portion protruding laterally from the clutch main operation lever 40. The wire 50 is biased so as to be pulled in the direction of arrow A in FIG. 7A, and the guide pin 45 of the curved plate 49 is fitted in the guide groove 46, so that the curved plate 49 is moved in the direction of arrow A. I'm pulling.

  A pivot 55 that pivotally supports a plate-like unlocking arm 54 protrudes in parallel with the main support shaft 41 on the side surface of the lock arm 42 and closer to the rear than the main support shaft 41. A finger operation lever 56 is integrally provided on the upper part of the unlocking arm 54 so as to extend rearward, and a plastic operation for pressing downward with a finger (thumb) on the rear end of the finger operation lever 56 is provided. A portion 56a is provided.

  A forward hook-like second engaging portion 58 that can be engaged with and disengaged from the round shaft 52 is formed on the front surface above the pivot 55 that is the rotation center of the unlocking arm 54. Between the lock arm 42 and the lock release arm 54 (and thus the finger operation lever 56), a second spring urging means 59 such as a tension spring type spring is mounted. With this second spring urging means 59, the unlocking arm 54 rotates clockwise as shown in FIG. 7B, and the second engaging portion 58 is engaged with the round shaft 52 from the rear. It is energized to stop.

  Note that a support shaft 61 as an attachment portion for the lock arm 42 at one end (upper end) of the second spring urging means 59 is a stopper for a notch-like contact action portion 62 opened rearward at the rear portion of the lock release arm 54. Acts as a pin. That is, when the finger operating lever 56 is pushed downward and the unlocking arm 54 is rotated in the direction in which the second engaging portion 58 is disengaged from the round shaft 52, the disengagement (unlocking) of the unlocking arm 54 is performed. At a slightly later timing, the rear portion of the lock arm 42 can be pushed downward and turned.

  In the embodiment, since the clutch operating device 38 is provided on the left handle bar 6a of the management machine 1, the finger operating lever 56 to be pressed downward with the thumb of the left hand of the operator is provided on the left handle bar 6a. It extends rearward on the right side from the outer periphery of the control portion 6c. Further, the finger operation lever with the thumb in the state where the grip portion 40b of the clutch main operation lever 40 is gripped so that the palm of the left hand of the worker and a plurality of fingers other than the thumb approach the lower surface of the control portion 6c. The grip portion 40b is disposed as close as possible to the operation portion 56a in the axial direction of the operation portion 6c so that the 56 operation portions 56a can be pressed downward.

  In addition, a sensor 60 such as a limit switch is provided on the mounting plate 39, and a pivot 47 projecting laterally to the wire arm 43 rotated rearward about the support shaft 44 in a clutch-engaged state (detected) Part) hits the detection part 60a of the sensor 60 (see FIG. 9B) and outputs an ON signal. In the clutch disengaged state, the wire arm 43 is rotated upward in the forward direction, and the pivot 47 which is the detected portion is separated from the detecting portion 60a (see FIGS. 7B and 10B), and the OFF signal It is configured to issue.

  The clutch engagement (ON) and disengagement (OFF) operations with the above configuration will be described in detail. When the operator drives the engine 3 of the management machine 1, the worker's left hand is first separated from the clutch main operation lever 40 as shown in FIGS. 7 (a) and 7 (b). In this state, the tension roller at the tip of the clutch arm (not shown) is separated from the belt by the biasing spring in the clutch device, and the clutch is disconnected. In the wire 50 connected to the clutch arm, it is assumed that the urging force is always acting in the direction of arrow A in FIG. When the operator releases his hands from the clutch main operation lever 40 and the finger operation lever 56, the lock arm 42 is moved to its front by the urging force of the first urging spring means 57 fitted around the main support shaft 41. The side pivots upward.

  At this time, the second engagement portion 58 of the lock release arm 54 biased by the second spring means 59 to the lock arm 42 is engaged with the round shaft 52 of the clutch main operation lever 40, and the lock arm 42 Since the first engagement portion 53 is also engaged with the round shaft 52, the clutch main body 40b of the clutch main operation lever 40 is separated largely downward from the lower surface of the round pipe-shaped control portion 6c. The operation lever 40, the finger operation lever 56 (clutch release arm 54), and the lock arm 42 are united and hold | maintain a rotation attitude | position (refer Fig.7 (a) and FIG.7 (b)). The posture of FIG. 7 is a normal state of clutch disconnection.

  Next, when the operator engages the clutch, the thumb of the left hand presses the upper surface of the control portion 6c of the left handle rod 6a, while the grip portion 40b of the clutch main operation lever 40 is moved to a plurality of other than the thumb of the left hand. By grasping with a finger (index finger to little finger), the grip portion 40b is brought close to the lower surface of the steering portion 6c of the handle rod 6a (see FIG. 8). Turning the grip part 40b or the operation part 56a of the finger operation lever 56 upward (the rear part of the lock arm 42 and the clutch release arm 54 turning upward) is called forward rotation, and conversely the grip part 40b. Further, the operation portion 56a of the finger operation lever 56 rotates upward (the rear portion of the lock arm 42 and the clutch release arm 54 rotate downward) is referred to as reverse rotation.

  Then, as described above, the clutch main operation lever 40, the finger operation lever 56 (clutch release arm 54), and the lock arm 42 can be rotated together via the round shaft 52 that is the lock portion, so that the lock The front side of the arm 42 is rotated downward, and the wire arm 43 is rotated downward and rearward via the guide groove 46 and the guide pin 45. Therefore, the wire 50 is moved in the direction of arrow B in FIG. Pull and clutch (ON).

  In this state, the operation part 56a of the finger operation lever 56 is raised to the inside of the control part 6c of the left handle rod 6a (see FIG. 9).

  From this state, if a plurality of fingers (index finger to little finger) other than the thumb of the left hand of the operator are released from the grip portion 40b, the state returns to the state of FIG. 8, and the clutch disengagement operation is possible.

  In addition, with the thumb and palm of the left hand, the upper surface of the control part 6c of the left handle bar 6a is pressed, while the grip part 40b of the clutch main operation lever 40 is held by a plurality of fingers other than the thumb of the left hand (index finger to little finger). The clutch can be disengaged with the following operation by grasping it.

  That is, as shown in FIGS. 9 (a) and 9 (b), the operation part 56b of the finger operation lever 56 is held with the thumb of the left hand while the grip part 40b is held close to the lower surface of the control part 6c. When lowered downward through the side of the control portion 6c, the unlocking arm 54 that rotates integrally with the finger operating lever 56 resists the urging force of the second spring urging means 59, as shown in FIG. To rotate counterclockwise. Then, the second engagement portion 58 is disengaged from the round shaft 52 (engagement release, lock release). Then, after a little timing, the support shaft (stopper pin) 61 is pushed downward by the contact action portion 62. Thereby, the rear part of the lock arm 42 is pushed downward and rotated. Then, as shown in FIG. 10A and FIG. 10B, the upward open hook-shaped first engagement portion 53 in the lock arm 42 is also detached from the round shaft 52. Further, when the finger operating lever 56 is pushed downward, the front side of the lock arm 42 is greatly raised and rotated, and the lock release arm 54 is rotated upward and forward, so that the wire 50 is moved forward ( Move in the direction of arrow A) and the clutch is disengaged.

  In this way, during the plowing work, the finger operating lever 56 is pushed down with the thumb of the gripped hand while holding the clutch main operating lever 40 with the operating portion 6a of the operating handle 6. Since the clutch can be disconnected by simply operating it, the steering handle 6 can be continuously stabilized without removing the steering handle 6 from the hand, and the clutch can be quickly operated in an emergency. There is an effect that can be done.

  As described above, in any of the above-described embodiments, the operator can move the finger operation lever 27 (56) in the unlocking direction (clutch) only by operating with the thumb without releasing the hand from the control portion 6c of the left handle bar 6a. Therefore, the steering handle 6 can be continuously stabilized without releasing the steering handle 6 from the hand, and the clutch disconnection operation in an emergency can be quickly performed.

  The clutch operating device of the present invention can be mounted on the right handle rod 6a instead of mounting the steering handle 6 on the left handle rod 6a. good. Further, it goes without saying that the present invention can be applied to walking type agricultural working machines and working machines.

It is a perspective view of a walk type management machine. FIG. 3 is a perspective view showing a normal clutch disengaged state with the clutch main operation lever released in the first embodiment of the clutch operation device. It is a perspective view which shows the clutch engagement state in 1st Embodiment. It is a perspective view which shows the clutch cut state by pushing-down operation of a finger operation lever. It is a VV arrow directional plan view of FIG. It is the VI-VI line arrow directional view of FIG. (A) is the perspective view from the left side surface which shows the normal clutch disengagement state which released the clutch main operation lever in 2nd Embodiment of a clutch operation apparatus, (b) is the perspective view from the right side surface similarly. . It is a perspective view from the left side which shows the clutch engagement state in 2nd Embodiment. (A) is the perspective view from the left side surface which shows the clutch disengagement initial state by pushing-down operation of the finger operation lever in 2nd Embodiment, (b) is the perspective view from the right side surface similarly. (A) is the perspective view from the left side surface which shows the clutch disengagement end state by pushing-down operation of the finger operation lever in 2nd Embodiment, (b) is the perspective view from the right side side similarly.

Explanation of symbols

6c Steering part 12, 38 Clutch operating device 13, 50 Wire 14, 39 Mounting plate 15, 40 Clutch main operating lever 16, 41 Main spindle 19, 43 Wire arm 22, 42 Lock arm 24, 53 First engaging part 25 , 57 First spring urging means 26, 52 Lock part 27, 56 Finger operating lever 29, 54 Unlocking arm 30, 58 Second engaging part 31, 59 Second spring urging means 33, 62 Contacting action part

Claims (4)

When the clutch main operation lever mounted on the steering portion of the handle is gripped in the direction approaching the control portion, the clutch is engaged via the clutch operating wire, and when the clutch main operation lever is released, In the clutch operating device in the walking type work machine configured so that the clutch is disengaged,
In the vicinity of the clutch main operation lever, a finger operation lever for clutch disengagement is arranged to be rotatable,
An interlocking mechanism is provided between the clutch main operation lever and the finger operation lever.
The interlocking mechanism is configured such that the clutch is disengaged by operating the finger operation lever in a downward direction away from the steering portion of the handle when the clutch main operation lever is gripped. A clutch operating device for a walking type work machine. The interlocking mechanism is
The clutch main operation lever is coupled to the finger main operation lever mounted on the clutch main operation lever so as to be pivotable up and down, a lock release arm provided to be rotatable integrally with the finger operation lever, and the wire. A wire arm rotatably mounted on the lever, a lock arm having a lock portion, and a second engagement portion provided on the lock arm and engaged with and disengaged from the lock portion;
While the clutch main operation lever is gripped, the wire arm is engaged via the lock arm so as to move in the clutch engagement direction,
When the clutch main operation lever is released, the lock arm and the wire arm are disengaged, and the wire arm moves in the clutch disengagement direction, and the clutch main operation lever is held. In the state, the finger operation lever is configured to move in a direction approaching the steering portion of the handle,
When the clutch main operation lever is in the grip operation state, the lock arm and the wire arm are unlocked via the lock release arm by operating the finger operation lever in the downward direction away from the control unit. The clutch operating device for a walk-type work machine according to claim 1, wherein the clutch operating device is configured such that the clutch is disengaged. The lock arm is spring-biased in a direction of locking engagement with the wire arm,
The unlocking arm includes a second engaging portion that engages with and disengages from the wire arm,
An urging means for urging the unlocking arm in the locking direction with respect to the wire arm is provided between the clutch main operating lever and the finger operating lever or the unlocking arm. Item 3. A clutch operating device for a walking work machine according to Item 2. The interlocking mechanism is
An unlocking arm that rotates integrally with the finger operation lever;
A wire arm connected to the wire, and a lock arm connected to the wire arm;
Furthermore, a lock part provided on the clutch main operation lever and engaged with and disengaged from the first engagement part in the lock arm and the second engagement part in the lock release arm, respectively.
A first spring biasing means provided in the lock arm and biased so that the first engagement portion is locked and engaged with the lock portion of the clutch main operation lever;
A second spring biasing means mounted between the lock arm and the finger operation lever or the unlock arm, and biasing the unlock arm in the locking direction against the lock portion;
When the clutch main operation lever is gripped, the lock arm and the unlock arm are integrally rotated in the forward direction, and the wire arm is rotated in the clutch engagement direction.
When the grip of the clutch main operation lever is released, the lock arm and the lock release arm are integrally rotated in the opposite direction, and the wire arm is rotated in the clutch disengagement direction.
In the grip operation state of the clutch main operation lever, by operating the finger operation lever in a downward direction away from the control unit, the lock arm is moved from the lock portion of the clutch main operation lever via the lock release arm. The clutch operating device for a walk-type work machine according to claim 1, wherein the clutch is disengaged and the clutch is disengaged.

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