JP5006721B2 - Walking type management machine - Google Patents

Description

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

In a walking type management machine, in order to transmit engine power to the left and right output transmission shafts, the engine output is transmitted to the vertical transmission shaft via the planetary gear mechanism and the power intermittent clutch, and the engine transmitted to the transmission shaft A configuration has been adopted in which power is transmitted to the left and right output transmission shafts 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 was room for improvement in terms of workability.

  The object of the present invention is to provide a walking type management machine capable of firmly supporting the side clutch mechanism and the output transmission shaft while improving the workability of assembling the parts by modifying the power transmission mechanism. There is in point to do.

〔Constitution〕
The characteristic configuration of the walking type management machine according to the present invention is such that a power transmission transmission case and a clutch operation transmission case are extended downwardly from an upper case equipped with a prime mover in a state where the power transmission case and the clutch operation transmission case are positioned forward and backward. The lower case parts of the transmission case and the clutch operation transmission case are connected by an output transmission case.
A side clutch mechanism and an output transmission shaft are accommodated in the output transmission case,
The power transmission case includes a power transmission shaft for the output transmission shaft in the output transmission case, and the clutch operation transmission case has an operation transmission shaft for the side clutch mechanism in the output transmission case. interior and Thea is,
The operation transmission shaft provided in the clutch operation transmission case is configured as an inner / outer double shaft structure, and is arranged on the outer side with respect to one side clutch of the pair of left and right side clutch mechanisms built in the output transmission case. The operation of the operation transmission shaft is transmitted, and the operation of the inner operation transmission shaft is transmitted to the other side clutch. The operation and effect are as follows.

[Effect effect]

The power transmission mechanism is housed in a power transmission gear case extending downward from an upper case equipped with a prime mover . In order to accommodate the operation linkage mechanism for the side clutch mechanism, a clutch operating transmission case is extended downward from the upper case.
The power transmission transmission case and the clutch operation transmission case configured in this manner are arranged in a state of being positioned in the longitudinal direction of the fuselage, and the lower portions of the power transmission transmission case and the clutch operation transmission case are disposed between the side clutches. The mechanism and the output transmission shaft were connected by an output transmission case.

The upper case housing the engine is arranged above the case with the above-described connection structure, and a power transmission transmission case and a clutch operation transmission case are provided on the front side and the rear side below the upper case. Further, the lower case portions of the power transmission transmission case and the clutch operation transmission case are connected by an output transmission case that houses the side clutch mechanism and the output transmission shaft. As a result, these four cases are connected in a quadrilateral shape to form a strong frame structure.
Since the side clutch mechanism and the output transmission shaft are housed in the output transmission case having such a strong configuration, the support structure for the side clutch mechanism and the output transmission shaft can be made strong.

  As shown in FIG. 1, the walking type management machine A is constructed with a tilling shaft 1 serving as a propulsion shaft as an output transmission shaft at the lower end of a transmission case 2 provided with a transmission mechanism B in an upright posture. 1 is attached with a tilling device 10 having a tilling claw 11, the upper end of the transmission case 2 is spread out in a trumpet shape, the engine 3 as a driving part is mounted on the upper end, 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 transmission case 2, a side clutch operating tool (not shown) is provided on the steering handle 5, and a working hitch member 4 is extended rearward above the transmission case 2 so as to be a resistance rod. 9 is attached 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, the transmission case 2 includes an upper case 2C that forms an upper storage space P, an output transmission case 2D that forms a lower storage space Q, and a power transmission shaft 12 to the worm reduction mechanism D. A power transmission case 2E for forming the front communication space R stored therein, 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 stored. It is configured.

That is, in the transmission case 2, the power transmission transmission case 2E extends downward from the front end portion of the upper case 2C, and the clutch operation transmission case 2F extends in parallel to the power transmission transmission case 2E from the rear end portion of the upper case 2C. The power transmission case 2E and the clutch operation transmission case 2F extend downward, and the output transmission case 2D located between the power transmission case 2E and the clutch operation transmission case 2F has a rectangular shape. It is connected and configured to present. The central portion 2G surrounded by the upper case 2C, the output transmission case 2D, the power transmission case 2E, and the clutch operation transmission case 2F becomes a wall surface, and the upper case 2C, the output transmission case 2D, and the power transmission transmission described above. The case 2E and the clutch operating transmission case 2F are integrally connected to make the transmission case 2 have a strong configuration.
However, the central portion 2G may be formed with a hole penetrating in the left-right direction, or may be a space portion having no wall surface at all.

  The transmission mechanism B will be described. As shown in FIG. 2 and FIG. 3, the transmission mechanism B includes a centrifugal clutch mechanism C coupled to an output shaft 3 </ b> A extending downward from the engine 3, and a vertical posture below the centrifugal clutch mechanism C. The power transmission shaft 12 is arranged in the front communication space R, and the worm 13 of the worm speed reduction mechanism D is attached to the lower end portion of the power 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 operating the accelerator for the engine 3 without requiring a lever (not shown).

  The worm speed reduction mechanism D will be described. As shown in FIGS. 2 and 3, the worm speed reduction mechanism D is attached to the worm 13 attached and fixed in a state of rotating integrally with the lower end portion of the power transmission shaft 12, and the tilling shaft 1 disposed behind the worm 13. The worm wheel 15 is supported in an idle manner.

  A linkage structure between the worm wheel 15 and the tilling shaft 1 will be described. As shown in FIGS. 3 and 5, 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. 3 and 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.

On the surface side of the clutch sleeve 17 facing the worm wheel 15, a recessed cam surface 17 b is formed on the entrance portion of the insertion hole 17 d formed at the axial position of the clutch sleeve 17 so as to ride on and hold down a ball-shaped connector 21 described later. is doing.
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.

On the boss portion 15A of the worm wheel 15, corresponding to both the output shaft portions 1A, mounting seats 15d for mounting the above-described ball-shaped coupling tool 21 are formed at a plurality of locations in the circumferential direction. The seat 15 d is also a through hole that opens toward the output shaft portion 1 </ b> A of the tillage 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 outer peripheral surface of the output shaft portion 1A facing the mounting seat 15d, the engaging groove portions 1a are formed at a plurality of locations in the circumferential direction, and the ball-like connector 21 enters and engages. .
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 power 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 double shaft structure portion is used for transmission of clutch operation of the transmission case 2 It is installed in the rear communication space S formed in the case 2F.

  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 fixed to the shift operating shaft 22, and each action portion 23B extends from the plate-like base end portion 23A toward the clutch sleeve 17 so that the clutch sleeve 17 is configured to act on 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.

The upper end of the shift operation shaft 22 located on the inner side is provided so as to protrude into the upper storage space P of the upper case 2C that stores the centrifugal clutch mechanism C and the like in the transmission case 2. One interlocking arm 24 that receives the operation force from the left and right linkage operation shafts 25 is mounted 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.

  A lower end portion of the cylindrical shift operation shaft 20 is protruded into the lower storage space Q, and the other left and right clutch shifters 27 are fixed to the protruding lower end portion. While the upper end of the cylindrical shift operation shaft 20 protrudes from the boss portion b into the upper storage space P, the other interlocking arm 28 that receives the operation force from the other left and right linked operation shafts 29 is provided at the protruding end. It is mounted so that it can rotate integrally.

  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 placed on the receiving washer 30. Therefore, the cylindrical shift operation shaft 20 is supported. 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 clutch shifters 23, the one interlocking arm 24, one rotating operation shaft 25, one drive arm 32, one passive arm 33, and one wire linking mechanism 34, one of the left and right linking operation mechanisms. F is configured.

  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.

As shown in FIGS. 4 and 5, 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 urging force of the urging spring 18. Close to 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 a rear space formed behind the power transmission shaft 12, and an effective use of the empty space can be achieved.
Here, the left and right other 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 linkage mechanism 38, the other linkage operation mechanism F is Constitute.

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.

[Other Embodiments]
(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 clutch operation transmission case 2F may be positioned on the front side of the machine body, and the power transmission case 2E may be positioned on the rear side of the machine body.
(6) In the above-described embodiment, the transmission case 2 is configured such that the output transmission case 2D is disposed between the power transmission case 2E and the clutch operation transmission case 2F so as to have a rectangular shape. However, the clutch operation transmission case 2F may be disposed above the output transmission case 2D.
However, either the power transmission transmission case 2E or the clutch operation transmission case 2F may be disposed on the front side of the body.

Overall side view of walking management machine A longitudinal side view showing a transmission case housing an engine, a worm reduction mechanism, a side clutch mechanism, and an operation mechanism for the side clutch mechanism Longitudinal front view showing the transmission case housing the side clutch mechanism and side clutch mechanism operating mechanism Cross-sectional plan view showing the operation linkage mechanism for the side clutch mechanism Enlarged cross-sectional view showing the side clutch mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Output transmission shaft 2C Upper case 2D Output transmission case 2E Transmission case for power transmission 2F Transmission case for clutch operation 3 Engine (priming part)
5 Steering handle 12 Power transmission shaft B Transmission mechanism D Worm reduction mechanism E Side clutch mechanism F Operation linkage mechanism for side clutch

Claims (1)

A power transmission transmission case and a clutch operation transmission case are extended downwardly from the upper case equipped with the prime mover so as to be positioned at the front and back, and the lower part of the power transmission transmission case and the clutch operation transmission case. Connect the case parts with an output transmission case,
A side clutch mechanism and an output transmission shaft are accommodated in the output transmission case,
The power transmission case includes a power transmission shaft for the output transmission shaft in the output transmission case, and the clutch operation transmission case has an operation transmission shaft for the side clutch mechanism in the output transmission case. interior and Thea is,
The operation transmission shaft provided in the clutch operation transmission case is configured as an inner / outer double shaft structure, and is arranged on the outer side with respect to one side clutch of the pair of left and right side clutch mechanisms built in the output transmission case. A walking type management machine configured to transmit an operation by an operation transmission shaft and transmit an operation by an inner operation transmission shaft to the other side clutch .

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