JP5006705B2 - Walking type management machine - Google Patents

Description

  The present invention relates to a walking-type management machine in which a driving unit is disposed above and left and right output shafts having side clutch mechanisms are disposed below.

In the walking type management machine, as disclosed in, for example, Patent Document 1, in order to transmit the engine power to the left and right output shafts, the engine output is transmitted to the vertical transmission shaft via the planetary gear mechanism and the power interrupting clutch. The engine output transmitted to the transmission shaft is transmitted to the left and right output shaft portions via the left and right side clutch mechanisms.
Japanese Patent No. 3886292 (paragraph [0021], FIGS. 2 and 3)

  In the above configuration, a planetary deceleration mechanism is employed from the viewpoint of obtaining a large deceleration effect while being a compact configuration. If it does so, it was necessary to assemble many parts in the narrow occupation space, and there existed a surface with bad workability | operativity.

  The object of the present invention has been made paying attention to such points, and while adopting a speed reduction mechanism that is easy to assemble, the walking type management has been devised with respect to the arrangement configuration of the operation system with respect to the side clutch mechanism. The point is to provide a machine.

〔Constitution〕
In the first invention, the worm wheel is arranged at the lower part of the transmission case, the driving part is arranged at the upper side, the worm is arranged at the front or rear side of the worm wheel to constitute the worm speed reduction mechanism, and in the transmission case A power transmission mechanism for transmitting power from the driving section to the worm; left and right side shaft mechanisms for linking the left and right output shafts that support the worm wheel and the worm wheel so as to be interlocked and disengageable; side arranged operating linkage mechanism for a clutch mechanism above the worm wheel tare is, the left and right side clutch mechanism provided with a respective clutch shifter supported on the same shaft, the operating linkage mechanism, wherein It located that it includes an operation linking unit of the left and right with respect to the left and right clutch shifter respective operational effects thereof It is as of.

[Function and effect]
A worm reduction mechanism is adopted as the reduction mechanism. Since the worm speed reduction mechanism is composed of two parts, a worm and a worm wheel, the number of parts is small, and the assembly is easier than when the planetary speed reduction mechanism is assembled.
Since the transmission mechanism for transmitting power from the prime mover is connected to the worm, the space above the worm wheel is an empty space. By paying attention to this portion, the linkage operating mechanism for the clutch shifter that turns the side clutch mechanism on and off is arranged above the worm wheel. As a result, the efficiency of space utilization was improved, and the transmission structure could be made compact.

Moreover, the left and right side clutch mechanisms each include a clutch shifter supported on the same shaft, and the operation linkage mechanism includes a left and right operation linkage mechanism portion for each of the left and right clutch shifters. The operational effects are as follows.

〔Constitution〕
The characteristic configuration of the invention according to claim 2 is that the transmission mechanism is a transmission shaft in a vertically oriented posture, and the operation and effect thereof are as follows.

[Function and effect]
As a transmission mechanism that transmits power to the worm, a transmission shaft with an up-and-down posture is adopted, so the space occupied in the front-rear direction is small, and it is easy to secure a space behind the transmission shaft, as described above, the operation of the side clutch mechanism The linkage mechanism could be easily placed above the worm wheel.

〔Constitution〕
A characteristic configuration of the invention according to claim 3 is that a steering handle is provided on the side opposite to the transmission mechanism existing side across the operation linkage mechanism, and the operation and effect thereof are as follows.

[Function and effect]
Since the operation linkage mechanism can be provided on the steering handle side, the linkage between the operation linkage mechanism and the operation tool of the steering handle can be easily performed, and there is little need to pull the operation wire, the operation linkage rod, or the like.
In addition, the relatively heavy transmission mechanism and the steering handle are arranged with the operation linkage mechanism interposed therebetween, so that the weight balance in the front-rear direction can be improved and the maneuverability of this type of walking type management machine is improved. I was able to.

[First Embodiment]
As shown in FIG. 1, the walking-type management machine A is constructed with a tilling shaft 1 that also serves as a propulsion shaft at a lower end portion of a transmission case 2 having a transmission mechanism B that is vertically oriented, and a tilling claw 11 on the tilling shaft 1. The upper end of the transmission case 2 is spread in a trumpet shape, the engine 3 is mounted on the upper end, the engine 3 is covered with the engine cover 6, and the rear surface of the lower end of the transmission case 2 is mounted. A steering handle 5 is attached, a side clutch operation tool (not shown) is provided on the steering handle 5, a working hitch member 4 is extended rearward above the transmission case 2, and a resistance bar 9 is attached. .

The transmission mechanism B will be described. As shown in FIGS. 2 and 3, the transmission mechanism B is arranged in a vertically oriented position below the centrifugal clutch mechanism C, and a centrifugal clutch mechanism C linked to an output shaft 3 </ b> A extending downward from the engine 3. The transmission shaft 12 and the worm reduction mechanism D provided corresponding to the lower end of the transmission shaft 12 are configured.
The centrifugal clutch mechanism C automatically enters the clutch disengaged state when the engine speed decreases to a set speed (for example, idling speed), and automatically enters the clutch engaged state when the engine speed becomes higher than the set speed. The clutch can be engaged and disengaged by an accelerator operation on the engine 2 without requiring a lever or the like.

  The worm speed reduction mechanism D will be described. The worm speed reduction mechanism D includes a worm 13 that is attached and fixed to the lower end of the transmission shaft 12 so as to rotate integrally, and a worm wheel 15 that is idled and supported by the tilling shaft 1 disposed behind the worm 13. It is.

  A linkage structure between the worm wheel 15 and the tilling shaft 1 will be described. As shown in FIGS. 2 and 3, the left and right output shaft portions 1A constituting the tilling shaft 1 are supported by the left and right side walls 2A and 2A of the transmission case 2 via bearings 16 while being in contact with each other. A boss 15A of the worm wheel 15 is externally fitted to the butted portion of the shaft 1A, and the left and right output shaft 1A is connected.

As shown in FIGS. 2 to 4, a storage hole communicating with the abutting portion is formed at the axial center position of the left and right output shaft portion 1 </ b> A, and the positioning pin 14 is stored in the storage hole of both output shaft portions 1 </ b> A. Has been. As a result, the output shaft portion 1A is positioned at the concentric position.
The boss portion 15A of the worm wheel 15 is formed to a length that reaches the bearing 16 that supports both output shaft portions 1A, and the worm wheel 15 is externally fitted to the output shaft portion 1A positioned by the positioning pin 14, It is attached.

  The left and right side clutch mechanism E formed between the worm wheel 15 and the output shaft portion 1A of the tilling shaft 1 will be described. As shown in FIGS. 2 to 4, a clutch sleeve 17 is slidably fitted to a boss portion 15 </ b> A extending to the left and right of the worm wheel 15, and is described later between the clutch sleeve 17 and the bearing 16. A receiving disk 19 for receiving the biasing spring 18 is disposed.

  The clutch sleeve 17 will be described. As shown in FIGS. 3 and 4, a large-diameter flange portion 17A is provided on the left and right end sides, and a cylindrical main body portion 17B having a smaller diameter than the flange portion 17A is formed. An annular groove 17a that is recessed in a direction away from the receiving disk 19 is formed on the surface of the cylindrical main body portion 17B facing the receiving disk 19, and the receiving disk 19 and the clutch sleeve 17 are separated from each other in the annular groove 17a. A biasing spring 18 that biases the clutch sleeve 17 in the clutch engagement direction is mounted.

As shown in FIGS. 3 and 4, on the surface side of the clutch sleeve 17 facing the worm wheel 15, it rides on a ball-shaped connector 21 described later at an inlet portion of an insertion hole 17 d formed at the axial position of the clutch sleeve 17. A recessed cam surface 17b to be pressed is formed.
On the other hand, on both side surfaces of the worm wheel 15 facing the clutch sleeve 17, recessed portions 15b that enter the thickness direction are formed, and contact restricting projections 15c are formed in a plurality of locations in the circumferential direction in the recessed portion 15b. It is provided. The contact restricting projection 15c is configured to contact the side surface of the clutch sleeve 17 facing the worm wheel 15 so as to maintain the proximity distance between the clutch sleeve 17 and the worm wheel 15.

As shown in FIGS. 3 and 4, the boss portion 15A of the worm wheel 15 is provided with a mounting seat 15d for mounting the ball-shaped connector 21 corresponding to both the output shaft portions 1A. The mounting seat 15d is also a through hole that opens toward the output shaft portion 1A of the tilling shaft 1. Thus, since the mounting seat 15d is a through-hole, the ball-shaped coupler 21 can protrude toward the output shaft portion 1A.
On the other hand, on the outer peripheral surface facing the mounting seat 15d of the output shaft portion 1A, the engaging groove portion 1a is formed at a plurality of locations in the circumferential direction, and the state where the ball-shaped connector 21 enters and engages. Form.
With the configuration as described above, the side clutch mechanism E is configured by the worm wheel 15, the clutch sleeve 17, the ball-shaped coupler 21, and the like.

  The operation linkage mechanism F for the side clutch mechanism E will be described. As shown in FIGS. 2 and 3, a rear space a is formed above the worm wheel 15 at a predetermined distance behind the transmission shaft 12, and the storage space b of the worm wheel 15 and the rear space a described above are provided. A narrow portion is provided between the two, and a single support shaft 23 supported by the receiving plate 22 is installed in the narrow portion. Left and right clutch shifters 24, 24 are attached to the support shaft 23 so as to be freely rotatable.

As shown in FIGS. 2 and 3, a pair of left and right rotational operation shafts 25 in the front-rear orientation are supported on the wall portion of the transmission case 2 above the left and right clutch shifters 24. The interlocking rod 26 is linked to the inner end 25a of the rotary operation shaft 25 protruding into the transmission case 2 via a small linkage arm 25A, and the outer end 25b of the rotation operating shaft 25 protruding to the outside of the transmission case 2 via the large linkage arm 25B. Linking wires 27 are linked.
The linkage wire 27 is linked to a clutch operating tool (not shown) and is configured to be operable.

The operation of the linkage operation mechanism F configured as described above is as follows. 2 and 3, the lower end 24a of the clutch shifter 24 is brought into contact with the flange portion 17A of the clutch sleeve 17 so that the clutch sleeve 17 can be operated.
That is, the clutch sleeve 17 is biased in the direction approaching the worm wheel 15 by receiving a biasing force of a biasing spring 18 provided between the clutch sleeve 17 and the receiving disk 19.

When the clutch operating tool 7 is operated to loosen the linkage wire 27, the clutch sleeve 17 receives the biasing force of the biasing spring 18 and approaches the worm wheel 15. In that case, the tip portion of the cylindrical sleeve portion 17B of the clutch sleeve 17 facing the worm wheel 15 enters the recessed portion 15b of the worm wheel 15 and abuts against the abutment restricting projection 15c.
In this state, the inner peripheral surface of the clutch sleeve 17 rides on the ball-shaped connecting tool 21 and pushes the ball-shaped connecting tool 21 toward the shaft core side. The mounting seat 15d of the boss portion 15A of the wheel 13 and the engaging groove portion 1a of the output shaft portion 1A enter into the state where power can be transmitted from the worm wheel 15 to the one output shaft portion 1A.

  When the operation of the side clutch operating tool 7 is performed, the linkage wire 27 is pulled, and the clutch sleeve 17 is separated from the worm wheel 15 against the urging force of the urging spring 18 by the clutch shifter 24, and the side clutch mechanism. Turn E off.

The interlocking rod 26 constituting the linkage operation mechanism F as described above can be accommodated in a rear space a formed above the worm wheel 15 and behind the transmission shaft 12, so that free space can be used effectively. Was planned.
Here, the left and right clutch shifters 24, the one rotation operation shaft 25, the one linkage rod 26, and the one linkage wire 27 are referred to as the left and right linkage operation mechanism sections.

[Second Embodiment]
Differences from the first embodiment will be mainly described. As shown in FIGS. 5 and 6, the path and arrangement configuration from the engine 3 to the side clutch mechanism E via the centrifugal clutch mechanism C and the worm reduction mechanism D are the same as those in the first embodiment. The structure of the side clutch mechanism E is the same. However, since the linkage operation mechanism F for the side clutch mechanism E is different, this will be described in detail.

  As shown in the first embodiment, a rear space a is maintained above the worm wheel 15 at a predetermined distance behind the transmission shaft 12, and the storage space b of the worm wheel 15 and the above-described rear space a A narrow portion is provided between the two, and a single support shaft 23 supported by the receiving plate 22 is installed in the narrow portion. Left and right clutch shifters 24 are attached to the support shaft 23 so as to be freely rotatable.

  As shown in FIGS. 5 and 6, a portion of the transmission case 2 is extended left and right outward to form a boss portion 2B near the upper end of the transmission case 2, and left and right rotation operations are performed on the left and right boss portions 2B. The shaft 25 is supported in a state of being located on the same axis. The rotary operation shaft 25 has one end protruding to the outside of the boss portion 2B and the other end protruding into the rear space a. One end protruding outward has a hexagonal cross section, and a large linkage arm 28 is attached to the hexagonal cross section so as to be integrally rotatable. A linkage wire 27 linked with a side clutch operating tool is linked to the large linkage arm 28 so that the side clutch mechanism E can be operated.

  As shown in FIGS. 5 and 6, the other end of the rotary operation shaft 25 protrudes into the rear space a and is similarly formed in a hexagonal cross section, and a small linkage arm 29 is attached to the hexagonal cross section. The clutch shifter 24 and the interlocking rod 26 are linked.

[Other Examples]
(1) A propulsion wheel may be attached to the tilling shaft 1 and the tilling shaft 1 may be used as a propelling shaft.
(2) The transmission shaft 12 and the worm 13 may be located on the rear side of the worm wheel 15.
(3) As the prime mover, an electric motor or the like may be used instead of the engine 2.

Overall side view of walking management machine Longitudinal side view showing the worm reduction mechanism and the side clutch mechanism in the first embodiment Longitudinal front view corresponding to FIG. Longitudinal front view showing the side clutch mechanism Longitudinal side view showing a worm reduction mechanism and a side clutch mechanism in the second embodiment Longitudinal front view corresponding to FIG.

Explanation of symbols

1A Output shaft section 2 Transmission case 3 Engine (power section)
5 Steering handle 12 Transmission shaft 13 Worm 15 Worm wheel 23 Support shaft (same shaft)
24 Clutch shifter B Transmission mechanism D Worm speed reduction mechanism E Side clutch mechanism F Operation linkage mechanism

Claims (3)

A worm wheel is arranged at the lower part of the transmission case, a driving part is arranged at the upper side, and a worm is arranged at the front or rear side of the worm wheel to constitute the worm reduction mechanism, and the power from the driving part is arranged in the transmission case. Left and right side clutch mechanisms that link the left and right output shafts that support the worm wheel and the worm wheel so that the worm wheel can be interlocked and disengaged are provided, and the left and right side clutch mechanisms are operated. the linkage mechanism is arranged above the worm wheel tare is,
The left and right side clutch mechanisms each include a clutch shifter supported on the same shaft, and the operation linkage mechanism includes left and right operation linkage mechanisms for the left and right clutch shifters . The walking type management machine according to claim 1, wherein the transmission mechanism is a transmission shaft in a vertically oriented posture . The walking type management machine according to claim 1 or 2, wherein a steering handle is provided on a side opposite to the transmission mechanism existing side with the operation linkage mechanism interposed therebetween .

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