JP4875552B2 - 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 a side clutch mechanism and left and right output shafts are disposed below.

In order to configure the left and right side clutch mechanisms, an input bevel gear (number in the publication: 21) that receives the engine power straddles the left and right output shaft portions (numbers in the publication: 8A, 8B) is externally fitted. A ball-shaped coupler for power transmission (name number in the publication: transmission ball 24) is interposed between the boss part (name number in the publication: cylindrical shaft 23) and the left and right output shaft parts, and the ball A clutch sleeve (name number in the gazette: holder 25) for switching the state coupling device between a power transmission state and a non-power transmission state is provided, and a single clutch shifter (name number in the gazette: shift) Fork 27) was provided.
As a drive operation of the clutch shifter, a single shift operation shaft (name number: operation shaft 28 in the publication) in the vertical orientation is provided behind the vertical transmission shaft (number: 6 in the publication), The shift operation shaft was arranged in a transmission case (name number in the publication: mission case 2).
JP 2000-316303 A (paragraph [0035], FIGS. 3 to 7)

In the above configuration, since the clutch shifter is single, both the left and right side clutch mechanisms cannot be switched to the disengaged state.
Therefore, since both output shaft portions cannot be switched to the cut state, there is a problem that the operability is not sufficient.

  The object of the present invention has been made by paying attention to such points. The number of installed clutch shifters is set appropriately, and the arrangement of the operation system for the side clutch mechanism having the appropriate clutch shifters is devised. The point is to provide a sophisticated walking type management machine.

〔Constitution〕
The characteristic configuration of the invention according to claim 1 is configured such that the power from the driving unit arranged in the upper part can be transmitted to the left and right side clutch mechanisms arranged in the lower part and the left and right output parts by a transmission mechanism arranged vertically. In addition, the left and right side clutch mechanisms are equipped with a clutch shifter that switches the side clutch mechanism to an on / off state, and a cylindrical shift operation is performed on one operation linkage mechanism that transmits an operating force to the left and right clutch shifters. The other shift operation shaft is provided in the other operation linkage mechanism that transmits the operation force to the left and right clutch shifters, and the other shift operation shaft is disposed in the internal space of the cylindrical shift operation shaft. The operation linkage mechanism is provided with a double shaft structure portion, and the transmission mechanism and the double shaft structure portion are arranged at the front and back, and the operation and effects thereof are as follows. .

[Function and effect]
Two clutch shifters were provided to constitute the left and right side clutch mechanisms. As a result, both the left and right side clutch mechanisms can be switched to the disengaged state, and power transmission to the left and right output shafts can be stopped without stopping the driving part. Can be improved.
Two operating systems are required to operate the two clutch shifters, but the operating system is partly equipped with a double-shaft structure, so this part occupies almost the same as the uniaxial structure. Space is enough.
In addition, since this double shaft structure portion is arranged in the front and rear with a transmission mechanism for transmitting power from the driving portion to the output shaft portion, the driving portion arranged at the upper portion, the side clutch mechanism and the output shaft portion arranged at the lower portion. The double shaft structure portion is disposed in the empty space formed between the two and the space can be effectively used by the double shaft structure portion and the transmission mechanism.
When viewed from the front-rear direction, the transmission mechanism and the double-shaft structure portion overlap each other, and the double-shaft structure does not protrude laterally from the partial transmission mechanism, so the soil resistance during operation does not increase.

〔Constitution〕
The characteristic configuration of the invention according to claim 2 resides in that a transmission case that houses the transmission mechanism is provided, and the double shaft structure portion is disposed in the transmission case. is there.

[Function and effect]
Since the double shaft structure part can be placed in the transmission case for the transmission mechanism, it is possible to protect the double shaft structure part and to provide a dedicated case for covering the double shaft structure part. There is no. Moreover, since the two shift operation shafts are made into a double shaft structure and housed in the transmission case, the occupied space in the transmission case can be reduced, and the double shaft structure part can be housed in the transmission case. It can be done easily.

〔Constitution〕
According to a third aspect of the present invention, the transmission mechanism includes a worm speed reduction mechanism including a worm and a worm wheel, the worm wheel is disposed at the same axial position as the output portion, and the worm wheel is sandwiched between the worm wheel and the worm wheel. The worm and the double-shaft structure portion are arranged in the front-rear direction, and the effects thereof are as follows.

[Function and effect]
Since the worm and the double shaft structure are placed in front and back with a large-diameter worm wheel in between, the front-rear balance centered on the worm wheel is better than when only the worm and worm wheel are placed in the front and back. Can be anything.

[First Embodiment]
As shown in FIG. 1, the walking-type management machine A lays a tilling shaft 1 serving as a propulsion shaft as an output unit at the lower end portion of a transmission case 2 provided with a transmission mechanism B in a vertically oriented posture. A tilling device 10 having a tilling claw 11 is attached to the upper end of the transmission case 2 in a trumpet shape, and an engine 3 as a driving part is mounted on the upper end of the transmission case 2, and the engine 3 is covered with an engine cover 6. A steering handle 5 is attached to the rear surface of the lower end portion of the case 2, a side clutch operating tool (not shown) is provided on the steering handle 5, and a work hitch member 4 is extended rearward above the transmission case 2 to thereby create a resistance rod 9. Is installed and configured.

  As shown in FIGS. 1 and 2, an upper storage space P equipped with an engine 3 in the transmission case 2, a centrifugal clutch mechanism C described later, and a lower storage space Q stored with a side clutch mechanism E described later are formed. The two communication spaces R and S in the vertical orientation are formed across the upper storage space P and the lower storage space Q.

  As shown in FIGS. 1 and 2, in the transmission case 2, the upper case 2 </ b> C forming the upper storage space P, the output transmission case 2 </ b> D forming the lower storage space Q, and the power transmission shaft 12 to the worm gear mechanism D are stored. A power transmission case 2E for forming the front communication space R and a clutch operation transmission case 2F for forming the rear communication space S in which the double operation shafts 20, 22 for the side clutch mechanism E are housed are formed. To do.

The upper case 2C, the output transmission case 2D, the power transmission case 2E, and the clutch operation transmission case 2F are connected to each other so as to have a square shape. The upper case 2C, the output transmission case 2D, and the power transmission The central portion 2G surrounded by the transmission case 2E and the clutch operation transmission case 2F is a wall surface, and the upper case 2C, the output transmission case 2D, the power transmission case 2E, and the clutch operation transmission case 2F are integrated. Are connected.
However, the central portion 2G may be formed with a hole penetrating in the left-right direction, or may have no wall at all.

The transmission mechanism B will be described. As shown in FIGS. 2 and 3, the transmission mechanism B includes a centrifugal clutch mechanism C linked to an output shaft 3 </ b> A extending downward from the engine 3, and a front side in a vertically oriented position below the centrifugal clutch mechanism C. The transmission shaft 12 is arranged in the communication space R, and a worm reduction mechanism D provided corresponding to the lower end of the transmission shaft 12.
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. As shown in FIGS. 2 and 3, the worm speed reduction mechanism D is idled to the worm 13 attached and fixed to the lower end portion of the transmission shaft 12 and the tilling shaft 1 disposed behind the worm 13. The worm wheel 15 is supported.

  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 1 </ b> A constituting the tilling shaft 1 are supported on the left and right side walls of the transmission case 2 via bearings 16 in abutting state, and the left and right output shaft portions 1 </ b> A are provided. The boss portion 15A of the worm wheel 15 is externally fitted to the abutting portion, and the left and right output shaft portions 1A are connected.

As shown in FIGS. 2 to 5, a storage hole communicating with the abutting portion is formed at the axial center position of the left and right output shaft portion 1A, and the positioning pin 14 is stored in the storage hole of both output shaft portions 1A. 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 5, the clutch sleeve 17 is slidably fitted on the 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. 2 and 5, 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. Thus, biasing springs 18 and 18 for biasing the clutch sleeve 17 in the clutch engagement direction are mounted.

As shown in FIGS. 2 and 5, 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. 2 and 5, the boss portion 15A of the worm wheel 15 has a mounting seat 15d for mounting the above-described 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.
As described above, the side clutch mechanism E is configured by the worm wheel 15, the clutch sleeve 17, the ball-shaped connector 21, and the like.

  The operation linkage mechanism F for the side clutch mechanism E will be described. As shown in FIGS. 2 to 4, a double shaft structure portion that bears a part of the operation linkage mechanism F is disposed on the rear side of the transmission shaft 12. The double shaft structure portion includes a cylindrical shift operation shaft 20 linked to one of the left and right side clutch mechanisms E and the other shift operation shaft 22 linked to the other left and right side clutch mechanisms E. One cylindrical shift operation shaft 20 is positioned outside, the other shift operation shaft 22 is accommodated in the internal space of the cylindrical shift operation shaft 20, and the rear communication space S of the transmission case 2 serves as a double shaft structure portion. It is installed inside.

  As shown in FIGS. 2 and 4, one clutch shifter 23 for switching and moving the clutch sleeve 17 of one side clutch mechanism E is attached and fixed to the lower end portion of the shift operation shaft 22 located on the inner side, and the shift operation shaft 22 is inserted into a receiving seat 2a formed on the bottom surface of the transmission case 2 and a lower plate-like base end described later of the one clutch shifter 23. A plate-like sliding bearing 35 is disposed between the downward surface of the portion 23 </ b> A and the bottom surface of the transmission case 2 to receive and configure the lower end of the shift operation shaft 22.

  One clutch shifter 23 has a pair of upper and lower plate-like base end portions 23A and 23A fixed to the shift operation shaft 22, and action portions 23B and 23B are directed from the plate-like base end portions 23A and 23A toward the clutch sleeve 17, respectively. It is configured to extend and act on the clutch sleeve 17. By rotating the clutch shifter 23 around the axis of the shift operation shaft 22, the clutch sleeve 17 can be switched and moved in the axial direction of the output shaft portion 1A.

As shown in FIGS. 2 to 4, the upper end of the shift operation shaft 22 located inside projects from the upper storage space P that houses the centrifugal clutch mechanism C and the like in the transmission case 2. One interlocking arm 24 that receives an operation force from one of the left and right linkage operation shafts 25, which will be described later, is attached to the upper end position of the first and second upper arms so as to be integrally rotatable.
A washer 26 is interposed between the lower surface of the base end of one of the interlocking arms 24 and the upper end of the cylindrical shift operation shaft 20 so that the rear communication space S is stored in the upper portion via the cylindrical shift operation shaft 20. As will be described later, the boss portion b that protrudes into the space P is configured to receive and support the shift operation shaft 22 positioned inside via the cylindrical shift operation shaft 20 positioned outside.

  As shown in FIGS. 2 to 4, the lower end portion of the cylindrical shift operation shaft 20 is protruded into the lower storage space Q, and the left and right clutch shifters 27 are fixed to the protruding lower end portion. The upper end of the cylindrical shift operating shaft 20 protrudes into the upper storage space P, and the other interlocking arm 28 receiving the operating force from the other left and right linked operating shafts 29 is attached to the protruding end so as to be integrally rotatable. It is.

  2 to 4, a receiving washer 30 is disposed between the other interlocking arm 28 and the upper end of the boss portion b formed at the upper end of the rear communication space S, and the other interlocking arm 28 is A configuration is employed in which the cylindrical shift operation shaft 20 is supported by being placed on the receiving washer 30. The other interlocking arm 28 is received by a shaft retaining ring 31 fitted to the cylindrical shift operation shaft 20, and the upward movement is restricted.

  Next, a configuration for transmitting the operating force to the double shaft structure will be described. As shown in FIGS. 2 to 4, on the upper support boss 2 </ b> A in which the left and right linking operation shafts 25 are projected from the inner surface of the transmission case 2 in a state along the left and right direction below the one interlocking arm 24. Support insertion. One drive arm 32 that abuts on one interlocking arm 24 mounted on the shift operation shaft 22 is provided at an inner end protruding into the upper storage space P from the upper support boss 2A of the left and right linkage operation shaft 25. It is attached.

As shown in FIGS. 2 to 4, left and right passive arms 33 are attached to the outer ends of the left and right linkage operation shafts 25 that protrude outward from the transmission case 2, and are not shown. The left and right passive arms 33 are linked to the clutch operating tool via the left and right wire linkage mechanisms 34.
Here, one of the left and right linkage operation mechanisms F is configured, and in particular, one of the left and right clutch shifters 23, one of the interlocking arms 24, one of the rotation operation shafts 25, one of the drive arms 32, one of the passive arms 33, The wire linkage mechanism 34 is referred to as the left / right linkage operation mechanism unit.

  Next, the configuration of the left and right other operation linkage mechanism F will be described. As shown in FIGS. 2 to 4, the left and right linkage operation shafts 29 are transmitted below the other interlocking arm 28 and in the state of facing the left and right linkage operation shafts 25 in the left-right direction. A cylindrical shift operation is performed at the inner end protruding from the lower support boss 2B of the left and right linkage operation shaft 29 into the upper storage space P while being inserted and supported by the lower support boss 2B protruding from the inner surface of the case 2. The other drive arm 36 that contacts the other interlocking arm 28 mounted on the shaft 20 is attached.

  As shown in FIGS. 2 to 4, the left and right passive arms 37 are attached to the outer ends of the left and right linkage operation shafts 29 that protrude outward from the transmission case 2, and are not shown. The left and right passive arms 37 are linked to the clutch operating tool via the left and right other wire linkage mechanisms 38. With the above configuration, the left and right other operation linkage mechanism F is configured.

With the above configuration, when the left and right side clutch operating tools are operated, the left and right passive arms 33 are driven to rotate via the left and right wire linkage mechanisms F. In response to the rotation of the passive arm 33, one of the left and right linkage operating shafts 25, one of the left and right driving arms 32, one of the left and right interlocking arms 24, the inner shift operating shaft 22, and one of the left and right clutch shifters 23 are driven in turn. The left and right clutch sleeves 17 that are energized are separated from the worm wheel 15 against the energizing force of the energizing spring 18 and the side clutch mechanism E is turned off.
Accordingly, one side clutch mechanism E is turned off. Since the other clutch operating tool is not operated, the other side clutch mechanism E is maintained in the engaged state.

When the operation to one of the left and right side clutch operating tools is released and one of the wire linkage mechanisms 34 is loosened, the clutch sleeve 17 receives the biasing force of the biasing spring 18 and approaches the worm wheel 15. In that case, the tip of the cylindrical sleeve portion 17B of the clutch sleeve 17 that faces the worm wheel 15 enters the recessed portion 15b of the worm wheel 15 and contacts the contact restriction projection 15c.
In this state, the inner peripheral surface of the clutch sleeve 17 rides on the ball-shaped coupling tool 21 and pushes the ball-shaped coupling tool 21 toward the shaft core side, so that the ball-shaped coupling tool 21 becomes a worm wheel as shown in FIG. 13 is inserted into the mounting seat 15d of the boss 15A and the engaging groove 1a of the output shaft 1A, and the worm wheel 15 is switched to a state where power can be transmitted to the one output shaft 1A.

The double shaft structure portion constituting the linkage operation mechanism F as described above can be accommodated in the rear space formed behind the transmission shaft 12, and the free space can be effectively used.
Here, the other linkage operation mechanism F is constructed, and in particular, the left and right clutch shifters 27, the other interlocking arm 28, the other rotation operation shaft 29, the other drive arm 36, the other passive arm 37, and the other wire. The linkage mechanism 38 is referred to as the left and right linkage operation mechanism unit.

When the other clutch operating tool is turned off, the left and right passive arms 37 are rotationally driven via the left and right other wire linkage mechanisms 38. In response to the rotation of the passive arm 37, the left and right other linkage operating shaft 29, the left and right other drive arm 36, the left and right other interlocking arm 28, the outer cylindrical shift operating shaft 20, and the left and right other clutch shifter 27 are in turn. The left and right other clutch sleeves 17 that are driven and energized are moved in the clutch disengagement direction, and the left and right other side clutch mechanisms E are disengaged.
When the both side clutch mechanism E is turned off, the left and right clutch operating tools may be operated.

[Second Embodiment]
Differences from the first embodiment will be mainly described. As shown in FIGS. 6 and 7, a structure is employed in which the engine 3 transmits to the side clutch mechanism E via the planetary reduction mechanism G, the on / off clutch H, the transmission mechanism B, and the bevel gear mechanism J. Further, since the linkage operation mechanism F for the side clutch mechanism E is different, this will also be described in detail.

  Although the point which arrange | positions the transmission shaft 12 in the front communication space R shown in 1st Embodiment is the same, while attaching and fixing the output bevel gear 7 to the lower end protruded below from the front communication space R of the transmission shaft 12, Instead of the worm wheel 15, the input bevel gear 8 is installed over the output shaft portion 1A, and the output bevel gear 7 and the input bevel gear 8 constitute a bevel gear mechanism J that transmits the power from the engine 3 to the side clutch mechanism E. .

  As shown in FIGS. 6 and 7, a double shaft structure of a shift operation shaft 22 and a cylindrical shift operation shaft 20 is arranged in the rear communication space S shown in the first embodiment. Clutch shifters 23 and 27 are attached to the operation shaft. One receiving pin 40 is fixed to the shaft end of the shift operation shaft 22 protruding upward from the rear communication space S, and the other receiving pin 41 is fixed to the shaft end of the cylindrical shift operation shaft 20. At the same time, the receiving pins 40 and 41 are extended in a cantilevered manner.

  As shown in FIGS. 6 and 7, a pair of linkage operation shafts 42 and 43 are arranged in parallel at the same height and adjacent to the left and right at the end where the receiving pins 40 and 41 are extended. . The pair of linkage operation shafts 42 and 43 are supported by the rear wall 2 </ b> C of the transmission case 2, and are provided with a front end portion protruding into the upper storage space P. Operation arms 42A and 43A are erected at the front end portions of the pair of linkage operation shafts 42 and 43, and are configured to abut against both receiving pins 40 and 41.

A pair of passive arms 44 and 45 are attached to the rear ends of the pair of linkage operation shafts 42 and 43 that protrude from the rear wall 2C of the transmission case 2, and a side clutch operation tool (not shown) is attached via the wire linkage mechanism. ).
In the above configuration, when one linkage operation shaft 42 is driven and one operation arm 42A is rotationally driven, the one operation arm 42A comes into contact with one receiving pin 40 and the shift operation shaft 22 is pushed. Rotate horizontally in the direction. When the shift operation shaft 22 is rotated, one side clutch mechanism E is turned off as in the first embodiment.

  When the other linkage operation shaft 43 is driven and the other operation arm 43A is rotationally driven, the other operation arm 43A comes into contact with the other receiving pin 41 in the direction in which the cylindrical shift operation shaft 20 is pushed. It rotates horizontally. When the cylindrical shift operation shaft 20 is rotated, the other side clutch mechanism E is turned off as in the first embodiment.

[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) As the prime mover, an electric motor or the like may be used instead of the engine 2.
(3) As the transmission mechanism B, a chain transmission mechanism, a timing belt, or the like can be used.
(4) The shift operation shaft 22 housed inside the cylindrical shift operation shaft 20 is a solid rod, but may be a cylindrical shaft.
(5) The double shaft structure portion may be positioned in front of the transmission mechanism B.
(6) The double shaft structure portion may be positioned outside the transmission case 2 as long as it is positioned before and after the transmission mechanism B.

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. Cross-sectional plan view showing the operation linkage mechanism for the side clutch mechanism Partially enlarged sectional view of FIG. Longitudinal side view showing a worm reduction mechanism and a side clutch mechanism in the second embodiment Longitudinal rear 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)

  The power from the driving part arranged in the upper part can be transmitted to the left and right side clutch mechanisms arranged in the lower part and the left and right output parts by the transmission mechanism arranged in the vertical direction. A clutch shifter that switches the side clutch mechanism to the on / off state is equipped, and a cylindrical shift operation shaft is provided in one operation linkage mechanism portion that transmits an operation force to the left and right clutch shifters, and the left and right clutch shifters The other operation linkage mechanism portion for transmitting the operation force is provided with the other shift operation shaft, the other shift operation shaft is disposed in the internal space of the cylindrical shift operation shaft, and the operation linkage mechanism has a double shaft structure. A walking-type management machine provided with a portion, wherein the transmission mechanism and the double-shaft structure portion are arranged forward and backward.   The walking type management machine according to claim 1, wherein a transmission case that houses the transmission mechanism is provided, and the double shaft structure portion is disposed in the transmission case.   The transmission mechanism includes a worm speed reduction mechanism including a worm and a worm wheel, the worm wheel is disposed at the same axial center position as the output portion, and the worm and the double-shaft structure portion sandwiching the worm wheel, The walking type management machine according to claim 1 or 2, wherein:

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