JP3468837B2 - Work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine such as a cultivator, and more particularly to an operating lever for the working machine.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Application Publication No. 4-267801 discloses such a cultivator. This cultivator is a working machine having a prime mover in front of a transmission case and a tilling rotary in the rear. A traveling wheel is disposed below, and a handle column is disposed above, and a transmission for traveling, a transmission for work, and a transmission input shaft for transmitting power of the prime mover to these devices are provided in the transmission case. Is housed. The power of the prime mover is transmitted to the transmission input shaft via the main clutch.

[0003] The traveling transmission includes a hydraulic stepless transmission formed by combining a hydraulic pump and a hydraulic motor, and a gear type auxiliary transmission connected to an output side of the transmission.

This cultivator uses various operation levers to operate the above-mentioned traveling and working transmissions to change the gear ratio and the rotating direction, and to operate the clutch to interrupt the transmission of power. Have. That is, of the left and right handles extending rearward from the handle column, a rotary clutch lever is provided on the grip portion of the right handle, and a change lever for operating the hydraulic continuously variable transmission is provided on the grip portion of the left handle. A main clutch lever for operating the clutch is provided, and a forward / backward traveling switching lever, a traveling auxiliary speed change lever, and a rotary forward / reverse switching lever are provided at the rear of the transmission case.

Japanese Utility Model Publication No. 57-2178 discloses a similar management work machine (tilling machine). In this management work machine, the hydraulic continuously variable transmission and the auxiliary transmission are operated by a single operation. It can be operated by lever.

[0006]

As described above, the working machine is provided with a large number of operating levers, and the main ones are provided on the handle, so that the structure of the handle is complicated. Further, since the number of operation levers is large, the operation becomes complicated and erroneous operation is liable to occur.

[0007] Japanese Utility Model Publication No. 57-2178 discloses a continuously variable hydraulic transmission and an auxiliary transmission that are operated by a single operating lever on a steering wheel. Although the number is reduced, it is compared with that described in Japanese Patent Application Laid-Open No. 4-267801 (hereinafter referred to as Japanese Patent Application Laid-Open No. HEI 4-267801). In this case, the number of operation levers provided on the steering wheel does not change. Therefore, simplification around the steering wheel cannot be expected by the actual public.

[0008] In addition, the simplification of the operation cannot be expected to have a sufficient effect in actual use.

That is, the tilling work by the working machine is performed with intermittent running while adjusting the running speed. In headland work, in particular, such speed adjustment and intermittent running can be performed smoothly and quickly. Although it is required, all the operating levers integrated in the actual public are operating levers for shifting, so that the above operation is required to perform this operation.
It is necessary to operate the gearshift operation lever and the clutch operation lever for intermittent running, and the operation is not as simple as in the past.

Although the vehicle body can be stopped with the transmission in neutral, it is difficult to completely stop the vehicle body because the engine power is easily transmitted to the traveling shaft, so that the traveling is interrupted without fail. Must operate the main clutch each time.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and in the present invention, power of a prime mover is sequentially transmitted to traveling wheels via a main clutch and a continuously variable transmission. Work equipment,
1 connected to the main clutch and the continuously variable transmission
The main clutch and the continuously variable transmission device and individually operable by the operation lever, the main clutch and the continuously variable
A link connecting an operation cable of a transmission to the operation lever
The binding device, the manipulation lever is fixed to the distal end of the operating lever
And a frame member extending in the axial direction of the
And is fitted into the frame member by a support shaft extending in the
The inserted support member, the frame member and the support member
Relative to the axis oriented at right angles to the supporting axis
Constituted by a pivot means for pivotably hinged, the frame portion
The material and the support member extend at right angles to the support axis
The pin is penetrated, and the frame member is
With the protrusion provided on the material and the friction plate pressed by the spring
Is rotatable through the engagement of
It is impossible to rotate with respect to the pin, and
Connect the operation cable of the main clutch, and
By connecting the operation cable of the continuously variable transmission,
The pin of the frame member based on an operation for shifting a bar
At any gear ratio setting operation position during rotation around
Of the main clutch without changing the set gear ratio.
Enables intermittent operation.

According to the present invention, the shift operation and the power intermittent operation, which are frequently performed during the operation, are performed by one operation lever, so that the operation is simple, the operation efficiency is improved, the work labor is reduced, and the erroneous operation is performed. Is also prevented.

Further, since the number of operation levers mounted on the handle is reduced, the area around the handle is simplified.

According to the present invention, the main clutch can be connected and disconnected without changing the set gear ratio at an arbitrary gear ratio setting operation position of the operation lever.

With this configuration, it is not necessary to reset the vehicle speed each time the main clutch is engaged or disengaged, and a constant vehicle speed can be maintained before and after the main clutch is disengaged, so that the working efficiency is significantly improved.

[0016]

FIG. 1 is a side view of a management work machine according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. Reference numeral 1 denotes a main body of the working machine.
Are connected.

The main body 1 has an engine (motor) 4 mounted on the front of an engine bed 3 and a transmission case 5 disposed behind the engine 4. Running wheels 6 are disposed below the rear of the engine bed 3. On the upper part of the transmission case 5, a handle column 7 is provided so as to be pivotable. A pair of left and right handles 8 are fixed to the handle column 7 and extend rearward. Above the engine 4, an air cleaner 9 for intake, a muffler 10 for exhaust, and a fuel tank
11 are arranged.

A crankshaft 12 and a transmission input shaft 13 are provided on the left side surfaces of the engine 4 and the transmission case 5, respectively.
The drive pulley 14 and the driven pulley 15 are fixed to these shafts, respectively. A drive belt 16 is stretched between the pulleys 14 and 15, and engine power is transmitted to the transmission input shaft 13 via the drive belt 16. Reference numeral 17 denotes a belt cover that covers the belt transmission.

A tension roller 18 is provided on the drive belt 16 so as to be freely engaged and disengaged. The tension roller 18 is engaged with the drive belt 16 to apply tension to the drive belt 16, whereby the transmission shaft 13 is moved from the crankshaft 12 to the transmission input shaft 13. Power is transmitted to
The power transmission from the crankshaft 12 to the transmission input shaft 13 is interrupted by retracting the tension roller 18 from the drive belt 16 and relaxing the drive belt 16. That is,
A main clutch 19 that connects and disconnects power from the engine 4 to the transmission case 5 is constituted by the tension roller 18. Reference numeral 20 denotes a cable for engaging and disengaging the tension roller 18 with the drive belt 16, that is, a main clutch cable, which is operated by an operation lever described later.

A transmission gearbox for traveling and a transmission gearbox for work are accommodated in the transmission case 5, and the engine power transmitted to the transmission input shaft 13 travels through the transmission gearbox to the traveling wheels 6 and the rotary gear, respectively. It is transmitted to the tillage part 2. That is, the power transmitted through the transmission for transmission is transmitted from the output shaft of the device to the traveling wheels 6 via the chain transmission 21, and the power transmitted via the transmission for operation is transmitted from the output shaft of the device to the chain transmission 22a, It is transmitted to the rotary claw 23 of the rotary tilling unit 2 via 22b.

[0021] The traveling transmission is provided with a continuously variable transmission as at least a part thereof. This continuously variable transmission according to the present embodiment is a hydraulic continuously variable transmission that is a combination of a swash plate type hydraulic pump and a hydraulic motor, similar to the above-described conventional example. As shown by a reference numeral 24 in FIG. , Protruding from the right side surface of the transmission case 5. The input shaft of the hydraulic continuously variable transmission 24, that is, the pump shaft of the hydraulic pump is connected to the transmission input shaft 13. As is well known, by changing the inclination angle of the swash plate of the hydraulic pump, the transmission input is changed. The power transmitted from the shaft 13 can be continuously changed. This shifting operation is performed by rotating the shift lever 25 to change the inclination angle of the swash plate.

The shift lever 25 is connected to a shift / main clutch operating lever 27 mounted near a handle grip 26 of the left handle 8 via a shift cable described later. The speed change / main clutch operation lever 27 is also connected to the main clutch cable 20 described above.
Both the main clutch 24 and the main clutch 19 can be operated.

FIG. 3 is an enlarged plan view showing the vicinity of the speed change / main clutch operation lever 27 in more detail. The speed change / main clutch operation lever 27 protrudes to the front side through a display plate 28 fixed to the handle 8 and protruding inward, and a rearwardly lying down position shown as 27 (A) in the drawing. 27 (B), and when the shift / main clutch operating lever 27 is in the down position, the tension roller 18 of the main clutch 19 is driven by the drive belt. Retract from 16 and crankshaft 12
When the power transmission from the transmission to the transmission input shaft 13 is interrupted and the speed change / main clutch operation lever 27 is in the upright position, the tension roller 18 is engaged with the drive belt 16 and
, And power is transmitted from the crankshaft 12 to the transmission input shaft 13. That is, the main clutch 19 is intermittently operated by operating the speed change / main clutch operation lever 27 back and forth.
(OFF, ON).

On the other hand, the speed change / main clutch operation lever 27 can be swung right and left as shown by chain lines 27 (C) and 27 (D) in the figure. By moving from the left position 27 (C) to the right position 27 (D), the output speed of the hydraulic continuously variable transmission 24 becomes low (LO
It changes continuously from W) to high speed (HIGH).

The power intermittent operation and the shift operation as described above by the shift and main clutch operation lever 27 are performed by connecting the main clutch cable 20 and the transmission cable 29 extending from the transmission lever 25 of the hydraulic continuously variable transmission 24 to the transmission shown in FIGS. This can be achieved by connecting to the speed change and main clutch operation lever 27 via the connecting device shown in FIG.

As can be seen from FIG. 4 and FIG.
A frame member 30 is fixed to a tip end of a speed change / main clutch operation lever 27 extending to the rear side of the frame member 30. Frame member 30 is upper plate 30
a, lower plate 30b and end plate connecting these rear ends
30c, the end plate 30c is used for shifting and the main clutch operation lever
The lever 27 is fixed to the tip end and extends in the axial direction of the lever 27.

A block-like support member 31, which is long in the front-rear direction, is fitted between the upper and lower plates 30a, 30b of the frame member 30. The front part of the support member 31 is pivotally supported by a support shaft 33 via a collar piece 32. As shown in FIG. 6, one end of the support shaft 33 is supported by the handle 8 via a bracket 34 welded to the handle 8, and the other end is supported by the handle 8 via the display plate 28.

In front of the support shaft 33, the pin 35 is
Upper and lower plates 30a, 30b and a support member inserted therebetween
31 penetrates at right angles to the support shaft 33. The cross-sectional shape of the portion 35a of the pin 35 that penetrates the support member 31 has a cutout shape as shown by a in the left of FIG. 9, and the corresponding hole 31a on the support member 31 side (FIG. 9). Also has a similar missing circle shape. Therefore, the support member 31 and the pin 35 do not rotate. However, since the upper and lower plates 30a and 30b of the frame member 30 are rotatably fitted to the pins 35, the frame member 30 and the support member 31 can relatively rotate around the axis of the pin 35.

An arm member 36 is pivotally supported on the support shaft 33. The arm member 36 includes an arm piece 37 protruding in the radial direction of the support shaft 33, and a guide piece 38 that crosses the rear of the end plate 30c of the frame member 30 substantially at right angles to the axis of the speed change / main clutch operation lever 27. And The guide piece 38 has an elongated slot with a width approximately equal to the diameter of the shifting and main clutch operating lever 27.
A transmission / main clutch operation lever 27 penetrates the slot 39 so as to be swingable right and left.

The rear end of the arc-shaped connecting member 40 is pivotally connected to the tip of the arm piece 37 of the arm member 36, and the main clutch cable 20 is connected to the front end of the connecting member 40.

FIG. 4 shows a state in which the speed change / main clutch operation lever 27 is in the lying position shown by 27 (A) in FIG.
At this time, the main clutch 19 is in the disconnected (OFF) state. In this state, the speed change / main clutch operation lever 27 is moved to the standing position 27.
When it is turned upward and forward toward (B), the frame member 30 and the support member 31 are integrated via the pin 35 in this turning direction.
The frame member 30 and the support member 31 rotate integrally around the support shaft 33. At the same time, the arm member 36 engaged with the transmission / main clutch operation lever 27 through the slot 39 also rotates around the support shaft 33, and rotates counterclockwise in FIG. Attract main clutch cable 20 through 40.

FIG. 5 is a side view showing a state in which the speed change / main clutch operation lever 27 has reached the upright position. The main clutch cable 20 is pulled out from the guide tube 41, and is drawn into the guide tube 41 at the other end (FIG. 1) to press the tension roller 18 against the drive belt 16, and the drive belt 16
The power is transmitted from the crankshaft 12 to the transmission input shaft 13 by applying tension to 16. That is, the main clutch 19 is connected (ON)
State.

Next, a mechanism for connecting the speed change / main clutch operation lever 27 and the speed change cable 29 will be described. The frame member 30
The upper plate 30a is provided with a projection 42 formed by cutting and raising the upper plate 30a. The upper plate 30a extends beyond the support member 31 to the front thereof, and the transmission cable 29 is clamped and fastened to the folded portion 30d at the front end, and extends laterally with respect to the transmission and main clutch operation lever 27. . Two sets of friction plates 43, 43,... And 44, 44, on the upper plate between the projection 42 and the folded portion 30d.
Are alternately stacked (see FIGS. 8 and 9). These friction plates 43 and 44 are fitted to the intermediate portion 35b of the pin 35 having a circular cross section.

As shown in FIG. 9, the upper portion 35c of the pin 35 has a cross-sectional shape of a broken circle like the lower portion 35a.
A detent 46 having a hole 45 in the shape of a missing circle is also fitted to the stopper.

Each of the friction plates 43 protrudes toward the protrusion 42, and the fork 42 is formed by a forked portion 43a formed at the protrusion.
(See FIG. 6). On the other hand, the friction plate 44 has an engaging portion 44a projecting in a direction perpendicular to the projecting portion of the friction plate 43, and the engaging portion 44a is provided in an engaging hole 47 formed in a hanging portion 46a of the rotation stopper 46. Engaged (see FIGS. 6 and 8).

Further, on the outside of the detent 46, the pin 35
Similarly, a locking piece 49 is fitted to the upper part 35c of the upper part 35 via a hole 48 (FIG. 9) having a partially circular shape. The locking piece 49 is prevented from coming out of the pin 35 by a nut 50 screwed into a male screw formed on the upper portion 35c, and a disc spring 51 is inserted between the locking piece 49 and the detent 46. Thus, the detent 46 and the friction plates 43 and 44 are pressed against the upper plate 30a of the frame member 30.
Note that the bent piece 46b formed on the rotation stopper 46 is
Is engaged with the notch concave portion 49a formed in the groove, and the rotation stopper 46 and the locking piece 49 are rotationally integrated.

The locking piece 49 has a hanging portion 49b facing the side surface of the frame member 30, and the tip of the guide tube 52 of the transmission cable 29 is fixed to the hanging portion 49b (FIG. 6). Speed change cable
Reference numeral 29 extends from the guide tube 52 and is fixed to the folded portion 30d (FIG. 4) at the front end of the frame member 30 as described above.

The speed change / main clutch operation lever 27 is moved to the guide piece.
When the frame member 30 is moved to the left and right along the slot 39, the frame member 30 rotates around the pin 35, and the transmission cable fixed to the end is
29 is drawn into or out of guide tube 52. In response to this, the shift lever 25 of the hydraulic continuously variable transmission 24 connected to the other end of the shift cable 29 operates,
The transmission ratio of the hydraulic continuously variable transmission 24 is set to a value corresponding to the left and right positions of the transmission cable 29.

When the frame member 30 rotates around the pin 35 as described above, the friction plate 43 engaged with the projection 42 rotates together with this, but is rotatably and integrally attached to the pin 35. Since the friction plate 44 engaged with the rotation stopper 46 does not rotate, and the friction plate 43 and the friction plate 44 are pressed against each other by the elastic force of the disc spring 51, a friction force acts between them. By this frictional force, the speed change / main clutch operation lever 27 is held at the set predetermined left and right position.

With the above arrangement, the main clutch 19 is disconnected by moving the transmission / main clutch operation lever 27 back and forth, and the hydraulic stepless operation is performed by moving the transmission / main clutch operation lever 27 left and right. The speed change of the transmission 24 is performed. That is, the main clutch 19 and the hydraulic continuously variable transmission 24 can be individually operated by one operating lever 27.

Further, in this embodiment, regardless of the position (speed ratio setting operation position) in the left-right direction of the speed / main clutch operation lever 27, the speed / main clutch is not changed (ie, without changing the set speed ratio). The main clutch 19 can be connected and disconnected by moving the operation lever 27 back and forth. Therefore, it is not necessary to reset the vehicle speed each time the main clutch is engaged and disconnected, and a constant vehicle speed can be maintained before and after the main clutch is engaged or disconnected, so that the working efficiency is significantly improved. In addition, the durability of the speed change operation device is improved, the plowing condition of the soil is improved, and the tillage unevenness is reduced.

FIGS. 10 to 14 show another embodiment of the present invention. In these figures, the same parts as those of the above embodiment are denoted by the same reference numerals.

The transmission / main clutch operation lever 27 in this embodiment also projects to the front side through a display plate 28 fixed to the handle 8 and protruding inward, similarly to the transmission / main clutch operation lever 27 in the previous embodiment. However, the display plate 28 is provided with a bent guide groove 53 (FIG. 10).
The speed change / main clutch operation lever 27 moves along the guide groove 53. That is, the main clutch 19 is switched from the disconnected (OFF) state to the connected (ON) state by the shift / main clutch operation lever 27 moving from the rear to the front along the left rear groove portion 53a, and the right front groove portion is moved. By moving from rear to front along 53b, the output speed of the hydraulic continuously variable transmission 24, and thus the vehicle speed, gradually changes from low speed (LOW) to high speed (HIGH). The groove portions 53a and 53b are left and right groove portions 53c.
Gearshift and main clutch operation lever 27
Is moved along the groove portion 53c to the left to perform the main clutch disconnection operation, and to the right to perform the speed change operation.

The structure of the tip of the transmission / main clutch operation lever 27 is the same as that of the above-described embodiment, and a frame member 30 is fixed to the tip of the transmission / main clutch operation lever 27 as shown in FIG.
A support member pivotally supported by a support shaft 33 between the upper plate and the lower plate
31 is inserted. The frame member 30 and the support member 31 are rotatably connected to each other by a pin 35 oriented in a direction perpendicular to the support shaft 33. The support shaft 33 is also pivotally supported by an arm member 36 having an arm piece 37 and a guide piece 38.
Is connected to the main clutch cable 20 via a connecting member 40.

The above structure is the same as that of the above embodiment, and the speed change / main clutch operation lever 27 is moved to the OFF position in FIG.
The arm member moves from the position (solid line position in FIG. 11) to the ON position (chain line position in FIG. 11) along the guide groove portion 53a.
The connecting member 36 and the connecting member 40 rotate to the chain line position in FIG.
From the disconnected state to the connected state.

However, in this embodiment, the pin 35 merely connects the frame member 30 and the support member 31 to each other.
As shown in FIG. 5, a second arm member 54 is pivotally supported by the support shaft 33 on the side opposite to the arm member 36 with respect to the support member 31,
Between the arm member 54 and the display plate portion 28a to which the support shaft 33 is attached, a friction holding device 55 similar to the above, comprising friction plates 43 and 44, a detent 46, a disc spring 51 and the like, is provided. The protrusion 42 that engages with the friction plate 43 is provided on the arm member 54 (see FIG.
12) The bent piece 46b of the detent 46 engages with the engagement hole 56 provided in the display panel portion 48a.

The arm member 54 has an arm piece 57 and a guide piece 58 similarly to the arm member 36, and the transmission cable 29 is connected to the arm piece 57 via a connecting member 59 similar to the connecting member 40. Have been.

The guide piece 38 of the arm member 36 and the arm member 54
Engaging grooves 60a and 60b are respectively formed in the end faces facing each other with the guide piece 58 (FIG. 14). These engagement grooves 60a and 60b correspond to the slots 39 in the above embodiment, and the shift / main clutch operation lever 27 is engaged with the engagement groove when moving from the OFF position to the ON position along the guide groove portion 53a. 60a is engaged with the gearshift and main clutch operation lever
In response to this movement of 27, arm member 36 operates. When the transmission / main clutch operation lever 27 reaches the ON position, the engagement groove 60a faces the engagement groove 60b. At this position, the transmission / main clutch operation lever 27 is moved rightward (leftward in FIG. 13).
To move the gearshift and main clutch operation lever 27 to the engagement groove 60.
Then, if the transmission and main clutch operation lever 27 is moved forward along the guide groove portion 53b, the arm member 54 is activated, and the vehicle speed gradually increases. The arm member 36 is held at the ON position by an appropriate urging means.

Since the frictional force of the friction holding device 55 acts on the arm member 54, the speed change and main clutch operation lever
27 itself can be held in a suitable set position to maintain a predetermined vehicle speed. Speed change and main clutch operation lever 27
Is returned to the LOW position, the engagement groove 60b and the engagement groove 60a are aligned again, so that the speed change / main clutch operation lever 27 can be immediately moved to the guide groove portion 53a side, that is, the main clutch operation side. Since the speed change / main clutch operation lever 27 is biased toward the main clutch operation side by the spring 61, when the shift operation side (the groove portion 53b side) reaches the LOW position, it automatically shifts to the main clutch operation side. Move on.

Also in this embodiment, one operation lever 27 is used.
, The main clutch 19 and the hydraulic continuously variable transmission 24 can be individually operated, so that the operation is simple, the operation efficiency is improved, the work labor is reduced, and erroneous operation is prevented. Further, since the number of operation levers mounted on the handle is reduced, the area around the handle is simplified.

As described above, the tension roller is used as the main clutch.
Although the embodiment using 18 and the hydraulic continuously variable transmission 24 as the continuously variable transmission has been described, it goes without saying that the main clutch and the continuously variable transmission in the present invention are not limited to these.

FIGS. 1 and 2 also show operation members other than the speed change / main clutch operation lever 27. In these figures, 62 is a kill switch, 63 is a throttle lever, 64 is a rotary clutch lever, 65 is a rotary forward / reverse switching lever, and 66 is a traveling forward / backward switching lever.

[0053]

According to the present invention, the shifting operation and the power intermittent operation, which are frequently performed during work, are performed by a single operation lever, so that the operation is simple, the work efficiency is improved, and the work labor is reduced. Also, erroneous operation is prevented.

Since the number of operation levers mounted on the handle is reduced, the area around the handle is simplified.

Further, since the main clutch can be connected and disconnected without changing the set gear ratio at an arbitrary gear ratio setting operation position of the operation lever, it is not necessary to reset the vehicle speed every time the main clutch is connected or disconnected. Since a constant vehicle speed can be maintained before and after the main clutch is engaged / disengaged, the work efficiency is significantly improved. Further, the durability of the speed change operation device is improved, the plowing condition of the soil is improved, and the unevenness of the tillage is reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a management work machine according to an embodiment of the present invention.

FIG. 2 is a plan view of the management work machine.

FIG. 3 is an enlarged plan view in the vicinity of a speed change and main clutch operation lever.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a side view showing a speed change / main clutch operation lever in a main clutch connected state.

FIG. 6 is a front view showing a part of FIG. 5 in a sectional view when viewed from the front.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is an exploded perspective view of a shift and main clutch operation lever.

FIG. 10 is a plan view similar to FIG. 3, showing another embodiment.

FIG. 11 is a side view showing the main clutch operation side device when the main clutch is operated.

FIG. 12 is a side view showing the speed change operation side device during a speed change operation.

FIG. 13 is a cross-sectional view of the speed change / main clutch operation lever in a main clutch connected state as viewed from the front.

FIG. 14 is a sectional view taken along line XIV-XIV in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body part, 2 ... Rotary tilling part, 3 ... Engine bed, 4 ... Engine, 5 ... Transmission case, 6 ... Running wheel, 7 ... Handle column, 8 ... Handle, 9 ... Air cleaner, 10 ... Muffler, 11 ... Fuel Tank, 12 ... crankshaft,
13: transmission input shaft, 14: drive pulley, 15: driven pulley, 16: drive belt, 17: belt cover, 18: tension roller, 19: main clutch, 20: main clutch cable,
21, 22… Chain transmission, 23… Rotary pawl, 24… Hydraulic continuously variable transmission, 25… Shift lever, 26… Handle grip, 27… Shift and main clutch operation lever, 28… Display board, 29
... speed change cable, 30 ... frame member, 31 ... support member, 32 ... collar piece, 33 ... support shaft, 34 ... bracket, 35 ... pin, 36 ...
Arm member, 37 ... arm piece, 38 ... guide piece, 39 ... slot,
40 ... connecting member, 41 ... guide tube, 42 ... protrusion, 43,44 ... friction plate, 45 ... hole, 46 ... detent, 47 ... engagement hole, 48 ... hole, 49 ...
Locking piece, 50 nut, 51 disc spring, 52 guide tube, 53 guide groove, 54 arm member, 55 friction holding device, 56 engagement hole, 57 arm piece, 58 guide portion Piece, 59 ... connecting member, 60 ... engaging groove, 61 ... spring, 62 ... kill switch, 63 ... throttle lever, 64 ... rotary clutch lever, 65 ... rotary forward / reverse switching lever, 66 ... traveling forward / backward switching lever .

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 20/00-20/08 F16H 59/00-59/12 G05G 1/00-25/04

Claims (1)

(57) [Claims] 1. A work machine in which power of a prime mover is sequentially transmitted to traveling wheels via a main clutch and a continuously variable transmission, wherein the power is connected to the main clutch and the continuously variable transmission.
The main clutch and the continuously variable transmission can be individually operated by the operation lever, and the operation cables of the main clutch and the continuously variable transmission can be moved forward .
A connecting device for connecting to the operating lever,
A frame fixed to the tip and extending in the axial direction of the operation lever
Material and a support shaft extending in a direction crossing the operation lever.
A supporting member pivotally supported and inserted into the frame member;
Direction of member and support member at right angles to the support axis
Pivot means for pivoting relative to each other about an axis of rotation
Direction perpendicular to the support shaft to constitute the frame member and the support member by a
Extends through the frame member, and the frame member
And was resiliently pressed by a projection and a spring provided on the frame member.
It is rotatable through engagement with the friction plate, and the support portion
The material is not allowed to rotate with respect to the pin, and the operation cable of the main clutch is connected to the support member.
Then, an operation cable of the continuously variable transmission is connected to the frame member.
And forming, before based on operation for shifting the operating lever
Arbitrary gear ratio setting for rotation of the frame member around the pin
In the fixed operating position, without changing the set gear ratio
A working machine, wherein the main clutch can be switched on and off .