JP3790612B2 - Side clutch left / right switching mechanism for self-propelled working machines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention automatically switches the left and right side clutches to the left and right side clutch levers provided on the steering handle when the steering handle of a self-propelled working machine such as a management machine is switched forward or backward. Regarding technology.
[0002]
[Prior art]
Conventionally, the rear part of the self-propelled working machine has a traction hitch so that various attachments suitable for the work form can be attached. For example, when the implement attached to the tow hitch is a tilling device or a standing device, the steering handle is set to face backward, and in the case of flail mower or the like, the steering handle can be changed forward. The steering handle is equipped with left and right side clutch levers for turning on and off the left and right side clutches provided to change the traveling direction of the work implement. For example, when the steering handle is turned to the rear, When the side clutch lever is grasped, the right side clutch is disengaged and the aircraft turns to the right, but when switched to the front, the left side clutch is disengaged and the aircraft turns to the left .
Therefore, a technique is known that automatically switches the operating direction of the left and right side clutches by the left and right side clutch levers when the handle is changed back and forth. For example, it is a technique of Unexamined-Japanese-Patent No. 61-157475.
[0003]
[Problems to be solved by the invention]
However, in the prior art, since the left and right switching device for the side clutch configured in the cam-type link mechanism outside the transmission case is arranged at the upper part of the fuselage, foreign matter such as dust and muddy water can easily enter, and the cam As a result, foreign matter may be caught between the contact part and the sliding part, and the sliding resistance is increased, so that malfunction is likely to occur, and the life of the parts is shortened. Further, the side clutch left / right switching device has a large number of parts, increases the number of assembly steps, and increases the cost.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention uses the following means, that is, the steering handle installed above the mission case is rotated around the vertical axis to change the front-rear direction with respect to the aircraft. In a freely configured self-propelled working machine, the first and second clutch operating shafts linked to the side clutch levers arranged on the left and right of the steering handle are pivotally supported in abutment with the transmission case. On the inner end side, first and second clutch switching members interlockingly linked with the left and right side clutches are installed so as to be relatively rotatable, and the first and second engagements can be engaged with either one of the clutch switching members. The members are installed so as not to rotate relative to each other, and the first engaging member is moved to the first clutch by interlocking with the steering handle with respect to the steering handle. A state in which the first clutch switching member is engaged with the working shaft and the second engagement member is engaged with the second clutch operation shaft and the second clutch operation member is engaged with the second clutch operation shaft; A state in which the clutch switching member is engaged and the second engagement member engages the first clutch switching member with the second clutch operating shaft appears in an interlocking manner.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The problems and means to be solved by the present invention are as described above. Next, an embodiment of the present invention shown in the accompanying drawings will be described. FIG. 1 is a left side view of a management machine adopting the present invention, FIG. 2 is a plan sectional view and a lower rear sectional view of an upper part of a mission case, and FIG. 3 is an operation of a side clutch left / right switching mechanism when a steering handle is shifted forward. FIG. 4 is an explanatory view, and FIG.
[0006]
From FIG. 1, as an example of a self-propelled working machine equipped with a mechanism in which the left and right side clutches are switched in conjunction with the forward / backward movement of the steering handle according to the present invention, from the overall configuration of the management machine K to which the rotary tiller T is mounted. explain. An engine E is mounted on the front side of the engine frame 1, and a fuel tank 2 is placed on the top of the engine E. The power from the engine E is transmitted to the transmission case 5 through pulleys and belts in the transmission case 11 disposed on the side of the engine E.
[0007]
The axles 23L and 23R for mounting the left and right traveling wheels 6 are horizontally mounted below the both side walls of the transmission case 5, and a traction hitch 18 is provided at the upper and lower central portion on the rear wall side of the transmission case 5 to provide a rotary. Various implements such as the tillage device T are fixed. The PTO shaft protrudes from one side wall of the transmission case 5, while the chain case 25 is disposed at the front left and right center of the rotary tiller T, and the input shaft is parallel to the PTO shaft and is located above the chain case 25. The power is transmitted to the chain case 25 via a belt (or chain) transmission mechanism in the transmission case 27 with respect to the PTO shaft and the input shaft. A tilling shaft 25a is horizontally mounted on the lower part of the chain case 25, and tilling claws 19, 19,... Are radially arranged on the tilling shaft 25a, and above the rotation trajectory of the tilling claws 19, 19,. The upper side is covered with the tilling cover 20.
[0008]
A steering handle 14 is disposed so as to be able to pivot back and forth around the vertical axis P-P from the upper part of the transmission case 5 upward and obliquely rearward. A main clutch lever 15 and an accelerator are disposed in the vicinity of the grip portion of the steering handle 14. A lever 17 and left and right side clutch levers 8R and 8L are arranged. A transmission lever 13 is disposed on the transmission case 5, and the transmission lever 13 and the steering handle 14 are configured to be able to be switched by rotating back and forth. And even when the steering handle 14 is rotated forward by the side clutch left / right switching mechanism of the present invention, when the operator grasps one of the side clutch levers 8R and 8L, that side is turned inside. The side clutch operates.
[0009]
Next, the structure of the side clutch in the transmission case accommodating the side clutch left / right switching mechanism of the present invention will be described. As shown in FIG. 2, a chain is used in this embodiment as a transmission means for transmitting power from a transmission not shown to the axles 23L and 23R horizontally mounted on the lower part of the mission case 5, and is arranged on the upper part of the mission case 5. The power shifted by a geared or hydraulic transmission is transmitted to the sprocket 31 supported on the abutting portion on the center side of the axles 23L and 23R via the chain 32 so as to be relatively rotatable. Yes.
[0010]
A boss portion is provided on each of the left and right sides of the sprocket 31, and a plurality of holes are formed through the boss portion in a radial direction so that clutch balls 33, 33,. On the other hand, recesses 34 and 34 are opened on the outer peripheral surfaces of the inner ends of the axles 23L and 23R, and the clutch sliders 35L and 35R are slidably fitted onto the axles 23L and 23R. Springs 36 and 36 are disposed on the axles 23L and 23R inside the clutch sliders 35L and 35R to urge the clutch sliders 35L and 35R outwardly. The clutch slider 35R on the right side of FIG. 2 is in a clutch-engaged state in which the upper half of the clutch balls 33, 33... Is fitted into the sprocket 31 and the lower half is fitted into the hole of the recess 34 to transmit power.
[0011]
The clutch sliders 35L and 35R pivotally support clutch arms 39L and 39R on pivot shafts 37 and 37 supported by the transmission case 5, and engage the clutch sliders 35L and 35R with one ends of the clutch arms 39L and 39R. ing. The other ends of the clutch arms 39L and 39R are pivotally supported by one ends of the connecting rods 40L and 40R, and the other side of the connecting rods 40L and 40R extends upward in the transmission case 5, and the present invention is provided at the end thereof. The side clutch left / right switching mechanism is connected. The side clutch left / right switching mechanism is connected to side clutch levers 8L and 8R provided in the vicinity of the left and right grips of the steering handle 14 via a wire or the like.
[0012]
In this way, the side clutch is configured. For example, when the side clutch lever 8L is gripped while traveling straight, the clutch slider 35R is slid outward by the biasing force of the spring 36 as shown on the right side of FIG. The clutch balls 33, 33... Are pushed into the recess 34 by the inner surface of the end portion of 35R, and the clutch is engaged. The power transmitted to the chain 32 is transmitted from the sprocket 31 to the axle 23R to drive the traveling wheels 6.
[0013]
On the other hand, as shown on the left side of FIG. 2, when the side clutch lever 8L is gripped, the connecting rod 40L is pulled up to rotate the clutch arm 39L, and the clutch slider 35L engaged with the clutch arm 39L is moved inward. The upper half of the clutch balls 33, 33,... Slides into the recess in the clutch slider 35L, comes out of the recess 34, and no power is transmitted from the sprocket 31 to the axle 23L, and the clutch is “disconnected”. Thus, the aircraft turns left by driving only the right traveling wheel 6.
[0014]
Next, the side clutch left / right switching mechanism of the present invention will be described. As shown in FIGS. 2 and 4, a rotation support shaft 41 protrudes downward on the lower surface of the base portion of the steering handle 14 and is rotatably supported on the transmission case 5 (however, the front and rear positions are not shown by a lock mechanism (not shown)). The lower portion of the rotation support shaft 41 is inserted into the mission case 5, and a gear 42 is fixed to the lower end of the rotation support shaft 41. A gear 43 is engaged with the gear 42 (however, the number of teeth of the gear 43 is larger than the number of teeth of the gear 42), the gear 43 is fixed to the support shaft 44, and the support shaft 44 is connected to the transmission case 5. The clutch operation shafts 47L and 47R pivotally supported on the left and right side walls of the clutch operation shafts 47L and 47R are arranged in a direction orthogonal to these axes, and are rotatably supported by the transmission case 5. A central portion of a gate-shaped interlocking arm 45 is fixed to the lower portion of the support shaft 44 while being rotatably supported by the mission case 5. In this embodiment, the bent portions 45a at the left and right ends of the interlocking arm 45 are interlocked when the steering handle 14 is rotated back and forth about 180 degrees around the vertical axis PP as described above. The rotation transmission ratio from the rotation support shaft 41 to the support shaft 44 is set so as to perform an arc motion of about 45 degrees. The rotation of the steering handle may be transmitted from the rotation support shaft 41 to the support shaft 44 by using a link mechanism or a cam mechanism instead of the gears 42 and 43.
[0015]
Clutch arms 47aL and 47aR are fixed to the outer ends of the cases of the clutch operating shafts 47L and 47R and linked to the side clutch levers 8L and 8R. A clutch switching member 49L is installed on the inner end side of the case of the clutch operating shaft 47L so as to be relatively rotatable, and an engaging member 46L is installed at the shaft end so as not to be relatively rotatable. Similarly, a clutch switching member 49R is installed on the inner end side of the case of the clutch operating shaft 47R so as to be relatively rotatable, and an engagement member 46R is installed at the shaft end so as not to be relatively rotatable.
[0016]
The clutch switching members 49L and 49R are formed in a disk shape, and arms 50L and 50R are extended from the outer peripheral edge of the clutch switching members 49L and 49R to connect to the other ends of the connecting rods 40L and 40R.
Further, a concave portion 49a is provided along the radial direction on the surface facing the engaging members 46L and 46R. On the other hand, the engaging members 46L and 46R include a bifurcated fulcrum leg portion 46b for connecting to the shaft ends of the clutch operating shafts 47L and 47R via a pin 48, and a clutch operating shaft from the first leg portion 46b. The engaging leg portions 46c and 46d extend in opposite directions along the axial length direction of the 47L, and the width of the engaging leg portions 46c and 46d is set to the concave portion 49a of the clutch switching member 49L and 49R. Set to match or slightly smaller than the width of.
[0017]
A hole 46 is opened in the side surface of the engaging leg 46d in each of the engaging members 46L and 46R, and the bent portion 45a of the interlocking arm 45 is inserted. The hole 46a is set slightly larger than the diameter of the bent portion 45a. Accordingly, as described above, when the bent portion 45a of the interlocking arm 45 performs an arc motion, the engaging members 46L and 46R are oscillated and displaced along the axial length direction of the clutch operating shafts 47L and 47R with the pin 48 as the center. It will be.
[0018]
As a result, as shown in FIG. 2, the engaging leg 46c of the engaging member 46L is fitted into the recess 49a of the clutch switching member 49L, and the clutch switching member 49L is engaged with the clutch operating shaft 47L. A first state in which the engaging leg portion 46c of 46R is fitted in the recess 49a of the clutch switching member 49R and the clutch switching member 49R is engaged with the clutch operating shaft 47R, and the engagement of the engaging member 46L as shown in FIG. The engaging leg portion 46d is engaged with the recess 49a of the clutch switching member 49R to engage the clutch switching member 49R with the clutch operating shaft 47L, and at the same time, the engaging leg portion 46d of the engaging member 46R is engaged with the recess 49a of the clutch switching member 49L. As a result, the second state in which the clutch switching member 49L is engaged with the clutch operating shaft 47R appears.
[0019]
In such a configuration, when the steering handle 14 is directed rearward, the first state shown in FIG. 2 is obtained, and the side clutch lever 8L is linked to the clutch switching member 49L via the clutch operating shaft 47L and the engaging member 46L. On the other hand, the side clutch lever 8R is linked to the clutch switching member 49R via the clutch operating shaft 47R and the engaging member 46R.
[0020]
When the steering handle 14 is directed forward, it is automatically switched to the second state by the support shaft 44 that is linked to the operation, and the side clutch lever 8L is moved to the clutch switching member via the clutch operating shaft 47L and the engaging member 46L. On the other hand, the side clutch lever 8R is linked to the clutch switching member 49L via the clutch operating shaft 47R and the engaging member 46R. As described above, regardless of the direction of the steering handle 14, the operator always grasps one side clutch, and the driving wheel on the grasping side is always cut off and the airframe turns.
[0021]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained. That is, the operating direction of the side clutch is automatically switched to the left and right at the same time as the steering handle is changed back and forth, so that it can be switched reliably without switching operation, and malfunction can be prevented. And the structure became simple and it was able to be comprised compactly on the clutch operating shaft.
In addition, it can be stored in the mission case and can prevent foreign matter such as dirt, dust, and muddy water from entering the side clutch left / right switching mechanism, eliminating rust and clogging, and ensuring reliable operation. This improves the performance, extends the service life of the parts, and reduces maintenance.
[Brief description of the drawings]
FIG. 1 is a left side view of a management machine adopting the present invention.
FIG. 2 is a plan sectional view and a lower rear sectional view of the upper part of the mission case.
FIG. 3 is an operation explanatory diagram of a side clutch left / right switching mechanism when a steering handle is changed forward.
FIG. 4 is a perspective view of a main part of a side clutch left / right switching mechanism.
[Explanation of symbols]
5 Mission case 14 Steering handle 45 Interlocking arm 47L / 47R Clutch operating shaft 46L / 46R Engaging member 49L / 49R Clutch switching member

Claims (1)

In a self-propelled working machine configured to rotate the steering handle installed above the mission case about the vertical axis so that the front and rear direction of the aircraft can be changed freely, it is linked to the side clutch levers arranged on the left and right of the steering handle. The first and second clutch operating shafts are pivotally supported against the transmission case, and the first and second clutch switching members linked to the left and right side clutches are rotated relative to the inner end of the clutch operating shaft. The first and second engaging members that can be freely installed and reversibly engage with any one of the clutch switching members are installed so as not to rotate relative to each other, and these engaging members are rotated with respect to the steering handle. In conjunction with the movement, the first engagement member engages the first clutch switching shaft with the first clutch operation shaft, and the second engagement member operates with the second clutch operation shaft. A state in which the second clutch switching member is engaged; a first engagement member that engages the second clutch switching member with the first clutch operating shaft; and a second engaging member that engages the second clutch operating shaft with the first clutch switching member. A side clutch left / right switching mechanism of a self-propelled working machine, wherein the interlocking linkage is made so that

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