JP4988879B2 - Working vehicle - Google Patents

Description

  The present invention belongs to the technical field of working vehicles such as walking type tillers.

  In general, a working vehicle such as this kind of walking type tillage machine has a traveling power transmission path for transmitting engine power to a traveling part via a traveling transmission mechanism, and a traveling clutch mechanism interposed in the traveling power transmission path. And a clutch lever for turning on and off the travel clutch mechanism, and a start operation and a travel stop operation of the airframe are performed based on the on / off operation of the clutch lever. In such a working vehicle, the clutch lever is held in the engaged position in consideration of operability during traveling. For example, the clutch lever is moved to the engaged position by utilizing the fulcrum action of a spring. There is something to hold.

  However, in the above conventional working vehicle, even when the traveling speed change mechanism is operated in reverse, when the clutch lever is operated, the clutch lever is held in the engaged position in the same manner as in the forward operation. Even if it is desired to stop the operation, simply releasing the clutch lever does not stop it, and it is necessary to consciously operate the clutch lever.

The present invention, which was created for the purpose of solving these problems in view of the such circumstances described above, the travel power transmission path for transmitting the driving unit through the run line transmission mechanism engine power, the A working vehicle including a traveling clutch mechanism interposed in a traveling power transmission path and a clutch lever for turning on and off the traveling clutch mechanism, wherein the clutch lever is a belt tension type traveling clutch mechanism. Is turned on / off via the clutch wire. If the fulcrum is exceeded when it is turned on, it is held at the on-position side, and if it does not exceed the fulcrum, it is biased toward the off-position side . the vehicle, when said traveling speed change mechanism is reverse operated, the fulcrum beyond the restraining means of the reverse holds for restraining the retention in entry position of the clutch lever by restrain, rear proceeds holding the restraining means Restraining the over fulcrum by, Rutotomoni provided a restraining switching means for selectively switching to the presence check that no check in the vicinity of the transmission case, check means of said reverse retention, in between the clutch wire and the running clutch mechanism An operating arm that rotates according to the operation of the clutch lever, a stopper arm that is connected and disconnected with respect to the operating arm, and contacts the stopper arm when the operating arm and the stopper arm are connected. On the other hand, it is configured using a member on the traveling speed change mechanism side that restricts the rotation of the operating arm by hitting, while the check switching means is connected to the stopper arm and connected to the operating arm according to the operation of the switching lever It is a connecting pin for switching release .
That is, when the traveling speed change mechanism is reverse operated by restrain beyond fulcrum of the clutch lever, it is possible to restrain retention in input operation of the clutch lever, the deadman clutch type clutch operation method when reverse As a result, in situations where it is desired to immediately stop traveling, traveling can be stopped simply by releasing the hand from the clutch lever. In addition, since the presence or absence of the restraint by the backward-holding restraining means can be selectively switched, the clutch lever can be kept in the engaged position when the work is performed while the vehicle is traveling backward.

It is a perspective view of a walking type tiller. It is a principal part side view which shows the main transmission lever. FIG. 3 is a view as seen from an arrow A in FIG. 2. FIG. 3 is a view taken in the direction of arrow B in FIG. 2. It is a top view which shows the main transmission shifter shaft. It is a side view of the traveling clutch mechanism and the reverse check mechanism showing the clutch lever disengaged state. It is a principal part top view same as the above. (A) is a cross-sectional view of the reverse check mechanism showing a state with reverse check, and (B) is a cross-sectional view of the reverse check mechanism showing a state without reverse check. It is a side view of the reverse check mechanism which shows the state which operated the clutch lever without reverse check. It is a principal part top view same as the above. It is a side view of the reverse check mechanism which shows the state which operated the clutch lever with reverse check. It is a principal part top view same as the above. It is a side view of the traveling clutch mechanism and reverse drive mechanism which show the clutch lever cut state in a second embodiment. It is a principal part top view same as the above. It is a side view of the reverse drive mechanism which shows the state which engaged and operated the clutch lever without reverse drive in 2nd embodiment. It is a principal part top view same as the above. It is a side view of the reverse drive mechanism which shows the state which engaged and operated the clutch lever with reverse drive in 2nd embodiment. It is a principal part top view same as the above.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a walk-type field cultivator. The walk-type field cultivator 1 shifts the power of the engine 3 mounted on the machine frame 2, the engine frame 2 that faces the front-rear direction, and the engine 3. A transmission case 4, a pair of left and right wheels 5 attached to a lower end portion of the transmission case 4 via an axle (not shown), a rotary tiller device 6 attached to a rear portion of the body frame 2, And a handle frame 7 extending from the rear.

  The transmission case 4 is internally provided with a main transmission mechanism (not shown) for shifting the traveling power. The main transmission mechanism is configured to perform a shift operation in response to a sliding operation of a main transmission shifter shaft 8 that is incorporated in the transmission case 4 so as to be slidable in the left-right direction. Each shifting position is held by engagement between the positioning groove 8a formed and the positioning ball 9 biased by the spring 9a.

  Above the transmission case 4 is provided a main transmission lever 10 for shifting the main transmission mechanism. The main transmission lever 10 is supported so as to be rotatable left and right with the lever shaft 10 a as a fulcrum, and the base end portion thereof is connected to the shift arm 11. The shift arm 11 is an L-shaped arm member having a connecting boss 11 a at the base end, and is integrally connected to one end of the main transmission shifter shaft 8 protruding from one side of the transmission case 4. As a result, the main transmission shifter shaft 8 slides to the left and right in accordance with the left / right operation of the main transmission lever 10, and the main transmission mechanism is operated to change the speed. Incidentally, the main transmission lever 10 of the present embodiment is further supported so as to be movable forward and backward, and is connected to a switching arm 14 of a rotary forward / reverse switching mechanism (not shown) via a slide plate 12 and a connecting rod 13. The rotary forward / reverse switching mechanism is switched by the forward / backward rotation of the switching arm 14 according to the forward / backward operation of the main transmission lever 10.

  A travel clutch mechanism 15 is interposed between the engine 3 and the transmission case 4. The travel clutch mechanism 15 includes an output pulley 16 provided on the output shaft 3 a of the engine 3, an input pulley 17 provided on the input shaft 4 a of the transmission case 4, and a transmission belt 18 suspended between the pulleys 16 and 17. And a tension arm 19 for tensioning / relaxing the transmission belt 18, and a belt tension clutch mechanism for turning on and off the power transmission between the pulleys 16 and 17 in accordance with the operation of the tension arm 19.

  The handle frame 7 is provided with a clutch lever 20 that can be operated forward and backward. The clutch lever 20 is connected to the tension arm 19 via a clutch wire 21 or the like. When the clutch lever 20 is in the rear position, the clutch wire 21 is loosened, and the traveling clutch mechanism 15 is kept in a disconnected state. On the other hand, when the clutch lever 20 is tilted forward, the clutch wire 21 is pulled and the traveling clutch mechanism 15 is switched to the on state. At this time, the tensile load acting on the clutch lever 20 via the clutch wire 21 exceeds the support shaft 20a of the clutch lever 20 and holds the clutch lever 20 in the on position.

  The clutch wire 21 is connected to the tension arm 19 via a reverse check mechanism 22, a connection plate 23, and a tension spring 24. The reverse check mechanism 22 includes a bracket 25 provided on a side surface portion of the transmission case 4, an arm support shaft 26 projecting outward from the bracket 25, and an operating arm 27 provided on the arm support shaft 26 so as to be pivotable back and forth. A stopper arm 28 provided between the operating arm 27 and the bracket 25, and a connecting pin 29 provided slidably to the left and right. Configured.

  The operating arm 27 is connected to the clutch lever 20 via the clutch wire 21 and is connected to the tension arm 19 via the connecting plate 23 and the tension spring 24, and rotates according to the operation of the clutch lever 20. . The stopper arm 28 supports the connecting pin 29 so as to be slidable left and right by a boss 28a provided at the tip thereof. The boss 28a is formed with a guide hole 28b having a square shape in plan view, and a switching lever 29a provided integrally with the connecting pin 29 protrudes upward through the guide hole 28b. The connecting pin 29 slides in response to the left / right operation along the guide hole 28b of the switching lever 29a, and engages with the engagement hole 25a formed in the bracket 25 at the right slide position (without reverse check), while on the left side In the sliding position (with reverse check), the engagement is made with the engagement hole 27a formed in the operating arm 27. As a result, the stopper arm 28 can be selectively connected to the operating arm 27. Further, the guide hole 28b has locking grooves (not shown) at both left and right ends, and the connecting pin 29 is held at each slide position by engaging the switching lever 29a in the locking groove in a resilient manner. Is done.

  Next, the operation of the reverse check mechanism 22 will be described with reference to the drawings. FIG. 9 is a side view of a reverse check mechanism showing a state in which the clutch lever is engaged and operated without reverse check, and FIG. 10 is a plan view of the main part of the same. As shown in these drawings, when the clutch lever 20 is turned on with the connecting pin 29 engaged with the bracket 25 side, the operating arm 27 is rotated independently by being pulled by the clutch wire 21. In this state, the operation arm 27 is allowed to freely rotate regardless of the slide position of the main transmission shifter shaft 8, and the clutch lever 20 is held in the on position by exceeding the fulcrum.

  FIG. 11 is a side view of the reverse check mechanism showing a state in which the clutch lever is turned on with reverse check, and FIG. 12 is a plan view of the main part of the same. As shown in these drawings, when the clutch lever 20 is turned on while the connecting pin 29 is engaged with the operating arm 27, the operating arm 27 and the stopper arm 28 are rotated together by being pulled by the clutch wire 21. Move. Here, when the main transmission shifter shaft 8 is in a position other than the reverse (R) position, the operating arm 27 is allowed to freely rotate, and the clutch lever 20 is held in the on position by exceeding the fulcrum. On the other hand, when the main transmission shifter shaft 8 is in the reverse drive position, the left and right positions of the restraining projections 11 b formed on the connecting boss 11 a of the shift arm 11 coincide with the left and right positions of the stopper arm 28. When the clutch lever 20 is turned on in this state, the contact recess 28c formed at the rear end of the stopper arm 28 contacts the check projection 11b, and the rotation of the stopper arm 28 is checked at a predetermined position. . As a result, the clutch lever 20 is restrained from being engaged before the position where the fulcrum is exceeded, and the lever is not allowed to be fixed at the position. That is, when the traveling speed change mechanism is in the reverse movement state, the reverse drive check mechanism 22 checks the fulcrum over in the operation of engaging the clutch lever 20, and makes it possible to switch the clutch operation method to the deadman clutch method.

  By the way, the stopper arm 28 of this embodiment is divided into a first stopper arm 28d for supporting the connecting pin 29 and a second stopper arm 28e in which a contact recess 28c is formed. It is rotatably supported by. Both stopper arms 28d and 28e are integrally connected by a bolt 30, but a bolt insertion hole (not shown) of the second stopper arm 28e is an arc-shaped long hole centering on the arm support shaft 26. The position adjustment of the second stopper arm 28e with respect to the first stopper arm 28d is allowed. As a result, regardless of assembly error, processing error, wire deformation, etc., the check position of the clutch lever 20 can be maintained properly, and the reverse check mechanism 22 can function effectively.

  Moreover, the connection plate 23 of this embodiment is divided | segmented into the 1st connection plate 23a and the 2nd connection plate 23b, and is connected via the length adjustment volt | bolt 23c. The length adjusting bolt 23c is screwed into the second connecting plate 23b and adjusts the length of the connecting plate 23 by moving the second connecting plate 23b forward and backward according to the turning operation. As a result, the tension of the traveling clutch mechanism 15 can be adjusted, and it is not allowed to cope with a tension failure caused by the extension deformation of the transmission belt 18, but the reverse check mechanism 22 can function effectively by appropriate tension adjustment. Is possible.

In the configuration as described above, a driving power transmission path for transmitting the power of the engine 3 to the wheels 5 (traveling section) via a main transmission mechanism (traveling transmission mechanism), and the driving power transmission path are provided. When the main speed change mechanism is reversely operated by the walking type tiller, the walking type tiller 1 includes a traveling clutch mechanism 15 and a clutch lever 20 for turning on and off the traveling clutch mechanism 15. When the main speed change mechanism is operated in reverse, the reverse check mechanism 22 for checking the holding of the clutch lever 20 in the engaged position and the connecting pin 29 for selectively switching the check by the reverse check mechanism 22 are provided. Thus, the holding of the clutch lever 20 at the engaged position can be checked. Since the presence or absence of reverse check can be selectively switched by operating the connecting pin 29, the clutch lever 20 can be kept in the engaged position when working while moving backward.

  The clutch lever 20 is configured to operate the belt tension type travel clutch mechanism 15 via a clutch wire 21 so as to maintain the on / off position by the action over the fulcrum. 22 is configured to check the operation of the clutch lever 20 beyond the fulcrum when the main transmission mechanism is operated in reverse, so that the clutch operating method in reverse can be switched to the deadman clutch method. In a situation where it is desired to immediately stop traveling, traveling can be stopped simply by releasing the hand from the clutch lever 20.

  Further, since a connecting plate 23 having a tension adjusting function of the traveling clutch mechanism 15 is interposed between the traveling clutch mechanism 15 and the reverse check mechanism 22, the transmission belt 18 is caused by elongation deformation or the like. The reverse check mechanism 22 can be made to function effectively by adjusting the appropriate tension as well as allowing the failure to deal with the tension failure.

  Further, the reverse check mechanism 22 is provided with a stopper position adjusting function for adjusting the stopper position on the stopper arm 18 that comes into contact with the check convex portion 11b of the shift arm 11 and checks the operation of engaging the clutch lever 20. The reverse check mechanism 22 can function effectively by adjusting the appropriate stopper position.

  Needless to say, the present invention is not limited to the above-described embodiment. For example, a reverse check mechanism 50 may be provided in the transmission case 4 as in the second embodiment shown in FIGS. In this case, the reverse check mechanism 50 and the main transmission mechanism can be easily linked, and the structure can be simplified. Hereinafter, the second embodiment will be described in detail with reference to the drawings. However, for parts having the same configuration as that of the first embodiment, the reference numerals used in the description of the first embodiment are attached to the drawings, and detailed description thereof is omitted.

  FIG. 13 is a side view of a traveling clutch mechanism and a reverse check mechanism showing a clutch lever disengaged state in the second embodiment, and FIG. 14 is a plan view of the relevant part. As shown in these drawings, the reverse check mechanism 50 of the second embodiment includes an arm support shaft 51 that penetrates the transmission case 4 from side to side, and an operating arm 52 that is integrally provided at one end of the arm support shaft 51. A switching handle 53 provided at the other end of the arm support shaft 51, a stopper arm 54 provided integrally with an intermediate portion of the arm support shaft 51, and provided integrally on the main transmission shifter shaft 8 side. And a restraining member 55 to be configured.

  The arm support shaft 51 is supported by the transmission case 4 so as to be slidable to the left and right and to be rotatable in the direction around the shaft, and according to the operation of the switching handle 53, the right slide position without reverse check and the reverse check are provided. Is selectively held at the left slide position. The operating arm 52 is connected to the clutch lever 20 via the clutch wire 21 and is connected to the tension arm 19 via the connecting plate 23 and the tension spring 24, and rotates according to the operation of the clutch lever 20. . The stopper arm 54 supports the arm so that its left and right positions coincide with the check member 55 only when the arm support shaft 51 is in the left slide position (with reverse check) and the main transmission shifter shaft 8 is in the reverse position. The shaft 51 is provided.

  Next, the operation of the reverse check mechanism 50 will be described with reference to the drawings. FIG. 15 is a side view of a reverse check mechanism showing a state in which the clutch lever is turned on without reverse check in the second embodiment, and FIG. 16 is a plan view of the main part of the same. As shown in these drawings, when the clutch lever 20 is turned on while the arm support shaft 51 is set to the right slide position (without reverse check), the operation arm 52, the arm support shaft 51, and The stopper arm 54 rotates integrally. In this state, the operation arm 52 is allowed to freely rotate regardless of the slide position of the main transmission shifter shaft 8, and the clutch lever 20 is held in the on position by exceeding the fulcrum.

  FIG. 17 is a side view of a reverse check mechanism showing a state in which the clutch lever is turned on with reverse check in the second embodiment, and FIG. 18 is a plan view of the main part of the same. As shown in these drawings, when the clutch lever 20 is turned on while the arm support shaft 51 is set to the left slide position (with reverse drive check), the operation arm 52, the arm support shaft 51, and The stopper arm 54 rotates integrally. Here, when the main transmission shifter shaft 8 is in a position other than reverse (R), the operating arm 52 is allowed to freely rotate, and the clutch lever 20 is held in the on position by exceeding the fulcrum. On the other hand, when the main transmission shifter shaft 8 is in the reverse drive position, the left / right position of the check member 55 provided on the main transmission shifter shaft 8 matches the left / right position of the stopper arm 54. When the clutch lever 20 is turned on in this state, the stopper arm 54 comes into contact with the restraining member 55 and the rotation of the stopper arm 54 is restrained at a predetermined position. As a result, the clutch lever 20 is restrained from being engaged before the position where the fulcrum is exceeded, and the lever is not allowed to be fixed at the position. That is, when the travel transmission mechanism is in the reverse drive state, the reverse drive check mechanism 50 checks that the fulcrum is exceeded when the clutch lever 20 is engaged, and the clutch operation method can be switched to the deadman clutch method.

DESCRIPTION OF SYMBOLS 1 Walking type tiller 4 Transmission case 8 Main transmission shifter shaft 10 Main transmission lever 11 Shift arm 11b Checking convex part 15 Traveling clutch mechanism 19 Tension arm 20 Clutch lever 21 Clutch wire 22 Reverse checking mechanism 23 Connecting plate 23c Adjustment bolt 25 Bracket 26 Arm support shaft 27 Actuating arm 28 Stopper arm 28c Contacting recess 29 Connecting pin 50 Reverse driving check mechanism 51 Arm support shaft 52 Operating arm 53 Switching handle 54 Stopper arm 55 Checking member

Claims (1)

A travel power transmission path for transmitting the driving unit through the run line transmission mechanism engine power, a travel clutch mechanism is interposed in該走acting power transmission paths, and a clutch lever to ON-OFF operate the running clutch mechanism The clutch lever is turned on / off when a belt tension type travel clutch mechanism is turned on / off via a clutch wire and the fulcrum is exceeded when the on / off operation is performed. If the fulcrum is retained and does not exceed the fulcrum, it is biased to the cut position side, and when the traveling speed change mechanism is operated backward on the work vehicle, the clutch lever is engaged by checking the fulcrum beyond. and restraining means of the reverse holds for restraining the retention in, the check of beyond fulcrum by restraining means of the rear advancing holding, trans and restraining switching means for selectively switching to the presence check that no restraining couriers Rutotomoni provided in the vicinity of Nkesu, check means of said reverse holding is provided between the clutch wire and the running clutch mechanism, the actuating arm which rotates in response to operation of the clutch lever, coupled to the actuating arm A stopper arm that is switched to release the connection, and a member on the traveling speed change mechanism side that restricts the rotation of the operating arm by contacting the stopper arm when the operating arm and the stopper arm are connected. On the other hand, the check switching means is a work vehicle that is a pin that switches the connection and release of the stopper arm with respect to the operating arm in accordance with the operation of the switching lever .

Images