JPH05278491A - Self-traveling work vehicle - Google Patents

Abstract

PURPOSE:To improve the maneuverability of a self-traveling work vehicle, to prevent an operator from being exposed to danger, and to select a operation method arbitrarily. CONSTITUTION:An engaging lock equipment 53 is provided for a traveling clutch lever 16 that is rotatively provided and a spring mounting plate 56 is attached to a cable set plate 54. A draft spring 59 is provided between the engaging lock equipment 53 for the traveling clutch lever 16 and the spring mounting plate 56 to constantly apply force to the traveling clutch lever 16 in the direction of the stop position. The attachement and removal of the draft spring 59 allows an operator to arbitrarily select an operation method for the traveling clutch lever 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled work vehicle and, more particularly, to a traveling clutch lever for operating the vehicle to run or stop.

[0002]

2. Description of the Related Art Conventionally, among working vehicles such as a tiller and a lawn mower, a walk-type self-propelled working vehicle in which an operator drives while pushing with a hand is provided with a traveling clutch lever at an operating portion of the machine body. The traveling clutch lever is rotated to operate or stop the aircraft. The traveling clutch lever is normally in the stop position due to the urging of a spring or the like, and the traveling clutch is in the disengaged state. Then, only when the operator turns the traveling clutch lever to the traveling position, the traveling clutch is engaged by the dead point of the spring or the action of other detent means, and the traveling clutch lever is fixed at the traveling position. ..

[0003]

The conventional self-propelled work vehicle, when the traveling clutch lever is rotated to the traveling position,
Since the spring is fixed at the traveling position by crossing the dead point of the spring or the like, the operator can operate the vehicle without releasing the traveling clutch lever. However, there is a risk that the operator may be caught between the machine body and the obstacle if there is any obstacle behind the machine body when working while moving backward.

Therefore, there arises a technical problem to be solved in order to improve the operability of the traveling clutch lever and avoid the danger of the operator, and the present invention aims to solve this problem. To do.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and a traveling clutch lever is provided in the operating portion of the machine body, and the traveling clutch lever is rotated to drive or move the machine body. In a self-propelled work vehicle that stops,
A tension spring is attached to the traveling clutch lever to constantly urge the traveling clutch lever toward the stop position, or fixing means is provided to the traveling clutch lever so that the traveling clutch lever can be fixed to the traveling position. The present invention provides a self-propelled work vehicle characterized by being configured to be selectable.

[0006]

According to the present invention, the operator can select the operating mode of the traveling clutch lever, and if the traveling clutch lever is provided with a tension spring, the traveling clutch lever is always urged toward the stop position. Further, when the tension clutch spring is not provided on the traveling clutch lever, the traveling clutch lever can be fixed to the traveling position by the detent means.

[0007]

An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show the appearance of a self-propelled work vehicle, 11 is a loading platform, 12 is a frame provided at the bottom of the loading platform, and a pair of crawlers 1 on both left and right sides of the frame 12.
3 and 13 are provided. A handle post 14 is erected on the right rear portion of the frame 12, a forward / backward movement lever 15 is provided on a side surface portion of the handle post 14, and a traveling clutch lever 16 and an auxiliary shift lever are provided on an operating portion 14a provided on the upper portion of the handle post 14. 17, a throttle lever 18, an engine start switch 19, etc. are provided. A side cover 20 is attached to the outer surface of the crawler 13.

As shown in FIG. 4, an engine portion 24 such as an engine 21, a generator 22 and a transmission case 23 is horizontally arranged on the bottom surface of the frame 12 at the lower part of the luggage carrier 11.
The power of the engine 21 is transmitted to the generator 22 and the mission case 23 via the belt transmission mechanism 25, and the generator 2
Two belt tension clutches 26 and 27 having different rotation ratios are provided between the No. 2 and the mission case 23.
A shifter 28 is provided between the two belt tension clutches 26, 27 to connect a wire 29 of the sub-transmission lever 17 so as to swing right and left, as will be described later.
The wire 30 of the traveling clutch lever 16 is connected so that only one of the belt tension clutches 26 and 27 is turned on.

An operation fitting 31 for switching between forward and backward movements and an operation fitting 32 for a side clutch are attached to the mission case 23, and are connected to the lower portion of the handle post 14 via wires, respectively. Therefore, if the forward / reverse lever 15 shown in FIG.
Then, for example, it is rotated clockwise to switch to the forward mode, and when the forward / backward lever 15 is rotated rearward, the operation fitting 31 is rotated counterclockwise to switch to the reverse mode. Further, when the handle post 14 is rotated to the left or right, the operation fitting 32 for the side clutch is pulled, and either the left or right side clutch is turned on or off.

FIG. 5 shows the structure of the belt transmission mechanism 25.
33 is an output pulley of the engine, 34 is a pulley of the generator, and 35 is a transmission pulley. The generator pulley 34 is a three-stage pulley, and the outer pulley 3
4a, the intermediate pulley 34b, and the inner pulley 34c rotate integrally. The transmission pulley 35 is a two-stage pulley, and the outer pulley 35a and the inner pulley 35b rotate integrally. Then, a V-belt 36 is stretched between the pulley 34a on the outside of the generator and the output pulley 33 of the engine, and a tension pulley 37 is brought into pressure contact with it to give a constant tension force. This tension is due to the spring 38
It can be adjusted by changing the pulling force of.

A V-belt 39 is stretched between a pulley 34b in the middle of the generator and a pulley 35a on the outside of the transmission pulley, and between the pulley 34c on the inside of the generator and the pulley 35b on the inside of the transmission pulley. Stretches the V-belt 40. Then, the tension pulley 41 is brought into contact with the V-belt 39 and the tension pulley 42 is brought into contact with the V-belt 40. 27 are configured.

By operating the sub-transmission lever 17 described above, the wire 29 shown in FIG. 4 is pushed and pulled to rotate the shifter 28, and the shifter 28 is moved to the tension arm side of the low-speed belt tension clutch 26. Or to move to the tension arm side of the high-speed belt tension clutch 27. Shifter 28
When the traveling clutch lever 16 is rotated to the traveling position after the vehicle has moved to any of the belt tension clutches 26 or 27, the wire 30 is pulled to the left in FIG. 5 and the tip of the shifter 28 is lowered. And one of the tension pulleys 41 or 42 moves to the V belt 39 or 40.
By pressing the belt tension clutch 2
6 or 27 is turned on. When the traveling clutch lever 16 is returned to the stop position, the wire 30 is pulled back by the tension spring 43 and the tip of the shifter 28 is moved upward so that both the belt tension clutches 26 and 27 are disengaged.

6 and 7 show the operation portion 1 of the handle post.
4a shows the interior of 4a, and the handle pipe 45 is attached to the handle frame 44 and the lever mounting bracket 4
Fix 6,46. Lever mounting bracket 46,46
The shaft 48 of the traveling clutch lever boss 47 and the shaft 49 of the sub-transmission lever 17 are pivotally attached to one side of the traveling clutch lever boss 47, and the other end 30a of the traveling clutch wire 30 is connected to one side of the traveling clutch lever boss 47. , The other end 50 of the brake wire 50 on the other side of the traveling clutch lever boss 47
Connect a. Further, a pressing portion 47a is provided at the center of the upper surface of the traveling clutch lever boss 47. An arm 51 is fixed to the other end of the shaft 49 of the auxiliary shift lever, and a pin 52 is provided at the tip of the arm 51 so as to project toward the inside of the lever mounting brackets 46, 46. The other end 29a of the wire 29 is connected.

Thus, in the state shown in FIG. 6, the traveling clutch lever 16 is lowered, and the traveling clutch wire 30 and the brake wire 50 are in the pushed back state. Therefore, the tip portion of the shifter 28 shown in FIG. 5 moves upward, and the belt tension clutches 26 and 27 are “disengaged”.
Becomes Further, since the brake wire 50 is pushed back, the parking brake (not shown) is activated to prevent accidental runaway of the self-propelled work vehicle. Further, the auxiliary shift lever 17 is moved up to the low speed position, and the wire 29 for switching the auxiliary shift is pushed back. Therefore, the tip of the shifter 28 moves to the tension arm side of the low-speed belt tension clutch 26.

When the traveling clutch lever 16 is rotated and raised from the state shown in FIG. 6, the traveling clutch lever boss 47 is integrally rotated as shown in FIG. The traveling clutch lever 16 is fixed. Therefore, the wires 30 and 50 are in a tensioned state, the rear end of the shifter 28 shown in FIG. 5 is pulled to the left in the figure, the tip of the shifter 28 moves downward, and the belt tension clutch 26 or 27 becomes " It will be turned on.

At this time, when the auxiliary shift lever 17 is raised and is in the low speed position, the tip of the shifter 28 acts on the tension pulley 41 side, so that the low speed belt tension clutch is operated by operating the traveling clutch lever 16. 26 becomes "ON", and the low speed traveling mode is set. on the other hand,
When the sub-transmission lever 17 descends and is in the high speed position, the tip of the shifter 28 acts on the tension pulley 42 side, so that the high speed belt tension clutch 27 is turned on by operating the traveling clutch lever 16. The high-speed driving mode is set. When the traveling clutch lever 16 is moved upward and the tip of the shifter 28 pushes down one of the tension pulleys 41 and 42, the auxiliary shift lever 17 cannot be operated. Also, the traveling clutch lever 16
Is moving upward, the brake wire 50 is pulled and the parking brake is released.

Here, as shown in FIG. 9, an engaging member 53 is fixedly provided in the vicinity of the rotation base of the traveling clutch lever 16 and the wire 30 for the traveling clutch lever fixed to the cable set plate 54 is adjusted. Loosen the nut 55 once, insert one side of the spring mounting plate 56, and tighten the adjustment nut 55 again. The spring mounting plate 56 is L-shaped as shown in FIG. 10, and has a U-shaped notch 57 formed on one side and locking holes 58, 58 formed on the other side. is there. Then, as shown in FIG. 9, a tension spring 59 is interposed between one of the locking holes 58 and the locking tool 53 fixed to the traveling clutch lever 16, and the traveling clutch lever 16 is moved downward. Urge to.

Then, as shown in FIG. 11, when the traveling clutch lever 16 is rotated upward to the traveling position, the belt tension clutch 26 or 27 becomes "on" and the machine body moves forward or backward. To do. However, when the operator releases his / her hand from the traveling clutch lever 16, the tensile force of the tension spring 59 is large even though the traveling clutch lever boss 47 is beyond the dead center of the shaft 48. The traveling clutch lever 16 rotates downward, and the traveling clutch lever 16 is pulled back to the stop position, as shown in FIG. Therefore, the operator can
If you remove your hand from, the aircraft will stop running instantly, and it will be possible to prevent accidental runaway of the aircraft.

The spring mounting plate 56 and the tension spring 59 can be easily attached and detached, and can be attached at any time according to the purpose of use of the user. Therefore, the operator can arbitrarily select whether to attach the tension spring 59 to constantly urge the traveling clutch lever 16 toward the stop position or to fix the traveling clutch lever 16 to the traveling position.

FIGS. 12 to 14 show another embodiment, in which an inner arm 61 which rotates in conjunction with the forward / reverse lever 15 is fixed to a rotary shaft 60 of the forward / reverse lever 15, and a traveling clutch is provided. An inner arm 63 that rotates in conjunction with the traveling clutch lever 16 is fixed to the rotation shaft 62 of the lever 16 at a substantially right angle to the base of the traveling clutch lever 16. And
A tension spring 64 is interposed between the tip 61a of the inner arm 61 and the tip 63a of the inner arm 63. 12
Shows the state in which the forward / reverse lever 15 is in the forward position and the traveling clutch lever 16 is in the stop position.
Since the tension spring 64 is located on the left side of the rotation shaft 62 of the traveling clutch lever 16, the inner arm 63 is fixed to the rotation shaft 62.
Is urged so as to rotate counterclockwise in the same figure, and the traveling clutch lever 16 is fixed at the stop position.

Here, as shown in FIG. 13, when the traveling clutch lever 16 is moved up to the traveling position, the inner arm 63 is rotated around the rotation shaft 62 in the clockwise direction in the figure. The tension spring 64 moves to the right of the rotation shaft 62. Therefore, the tension spring 64 is in a state beyond the dead center with respect to the rotating shaft 62, and the traveling clutch lever 16 is fixed at the traveling position. That is, when the aircraft is traveling forward, the aircraft continues traveling forward even if the operator releases his / her hand from the traveling clutch lever 16.

On the other hand, in the state shown in FIG. 13, when the forward / reverse lever 15 is rotated rearward to the reverse position, the inner arm 61 rotates counterclockwise as shown by the chain double-dashed line in the figure. The tension spring 64 moves to the left side of the rotation shaft 62. Therefore, the pulling action of the tension spring 64 causes the inner arm 63 to rotate counterclockwise around the rotation shaft 62 in the same figure, and the traveling clutch lever 16 moves downward and stops as shown in FIG. Returned to position. That is, when the aircraft travels backward, the operator must always hold the traveling clutch lever 16 at the traveling position and hold it. When the operator releases the traveling clutch lever 16, the traveling clutch lever 16 automatically moves. The aircraft automatically returns to the stop position and the aircraft stops.

Thus, even if there is an obstacle behind in the work while the self-propelled work vehicle is moving backward, if the operator releases the traveling clutch lever 16, the machine will automatically stop. It is possible to avoid a risk that the operator is caught between the machine body and the obstacle. As shown in FIGS. 15 and 16, stays 67 and 67 are attached to the left and right side edge frames 65 and 66 of the luggage carrier 11, and the stay 67 is fixed to the lower surface of the luggage carrier 11 by a pipe 68. Have been inserted into. Then, by loosening the fixing tool 69, sliding the stay 67 outward, and tightening the fixing tool 69 again, as shown in the drawing, the left and right side edge frames 65, 66 are fixed in a state of protruding left and right. Similarly, as shown in FIG. 16, the front edge frame 70 of the luggage carrier 11 is also formed so as to be able to extend and contract forward by sliding the stays 67, 67. Thus,
Side edge frames 65, 66 when carrying a large-footprint luggage
Also, by extending the front edge frame 70, it is possible to carry the luggage in a stable loaded state.

Here, the left and right side edge frames 6 of the luggage carrier 11
Hook plates 71, 71 are attached to the inside of 5, 66, and when the luggage is loaded on the loading platform 11, the left and right side edge frames 65, 66 are pulled out, and ropes or the like are hooked on the respective hook plates 71. If tied to 72, it is possible to prevent a load from collapsing or dropping. When the ropes or the like are not used, the hook plates 71 and the hooks 72 are covered by retracting the left and right side edge frames 65 and 66, and unnecessary protrusions are eliminated on the outer surface of the luggage carrier 11 for safety management. Highly preferred. The number of hook plates 71 may be plural on each side.

Also, as shown in FIGS. 17 and 18, opening holes 73, 73 are formed at appropriate positions of the left and right side edge frames 65, 66.
The hooks 74, 74 above and below the respective opening holes 73.
... is fixed. When the rope is tied to the equal hooks 74, 74, the rope may be inserted from the outside of the opening hole 73 or the inside of the side edge frames 65 and 66. Therefore, from the loading platform 11 to the left and right side edge frames 6
It is possible to use the non-uniform hooks 74, 74 ... without pulling out the non-uniform hooks 5, 66.
4 does not project to the outer side surface of the luggage carrier 11.

Further, as shown in FIGS. 19 and 20, recessed portions 75, 7 are formed at appropriate positions on the left and right side edge frames 65, 66.
5 are provided, and hooks 76, 76 are provided inside the respective recessed portions 75.
... may be fixed. Even in the case of such a configuration, the hook 7
6 and 76 do not project to the outer side surface of the luggage carrier 11, so that it is extremely preferable in terms of safety as in the case of the above-mentioned configuration, and the recessed portion 75 itself is formed of the side edge frames 65 and 66. It also reinforces and improves strength.

The present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the invention extends to the modified version.

[0028]

According to the present invention, a tension spring is provided on the traveling clutch lever, so that the traveling clutch lever is constantly urged toward the stop position, and when the operator releases the traveling clutch lever, the machine body instantly moves. Stop. Therefore, for example, even when the self-propelled work vehicle moves backward and approaches an obstacle, it is possible to avoid an accident in which the operator is caught between the machine body and the obstacle.

The tension spring can be attached and detached very easily and quickly, and the travel clutch lever can be fixed to the traveling position without interposing the tension spring on the traveling clutch lever. Either one of the operation methods can be arbitrarily selected, and it becomes extremely versatile.

[Brief description of drawings]

FIG. 1 is a perspective view of a self-propelled work vehicle according to an embodiment of the present invention as viewed from the rear.

FIG. 2 is a side view showing a right side portion of the self-propelled work vehicle.

FIG. 3 is a rear view of the self-propelled work vehicle.

FIG. 4 is a plan view showing the inside of a self-propelled work vehicle.

FIG. 5 is a side view of a main part of a belt tension mechanism.

FIG. 6 is a side view of the main part of the operating portion of the handle post, showing the traveling clutch lever in the stop position.

FIG. 7 is a plan view of a main portion of the operating portion of the handle post, showing the traveling clutch lever in the stop position.

FIG. 8 is a side view of the main part of the operating portion of the handle post, showing the traveling clutch lever in the traveling position.

FIG. 9 is a side view of an essential part showing a state where the traveling clutch lever is in a stop position, showing an operating portion of the handle post when the traveling clutch lever is provided with a tension spring.

FIG. 10 is a perspective view of a spring mounting plate.

FIG. 11 is a side view of an essential part showing a state where the traveling clutch lever is in a traveling position, showing an operating portion of the handle post when the traveling clutch lever is provided with a tension spring.

FIG. 12 is a side view of the main part of the operating portion of the handle post when the traveling clutch lever is in the stop position according to another embodiment.

13 is a side view of the main part of the operating portion of the handle post when the traveling clutch lever is in the traveling position from the state shown in FIG.

FIG. 14 is a side view of the main part of the operating portion of the handle post when the traveling clutch lever returns to the stop position as a result of operating the forward / reverse lever in the reverse position in the state shown in FIG. 13;

FIG. 15 is a perspective view of the self-propelled work vehicle in which the left and right side edge frames of the loading platform are pulled out to expose the hook plates, as viewed from the rear side.

16 is a plan view of the self-propelled work vehicle in the state shown in FIG.

FIG. 17 is a perspective view showing a state where hooks are provided on the left and right side edge frames.

18 is a cross-sectional view taken along the line AA of FIG.

FIG. 19 is a perspective view showing a modified example of the left and right side edge frames shown in FIG.

20 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 14 Handle Post 14a Operation Part 16 Traveling Clutch Lever 53 Locking Tool 54 Cable Set Plate 59 Tension Spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Oshima 3-12-4 Gion, Asanan-ku, Hiroshima City, Hiroshima Prefecture Yutani Heavy Industries Co., Ltd. (72) Inventor Yasuhiro Fujioka 1 Yakura, Tobe, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. In a self-propelled work vehicle in which a traveling clutch lever is provided on an operating portion of a machine body and the traveling clutch lever is rotated to run or stop the machine body, a tension spring is interposed in the traveling clutch lever. The traveling clutch lever is always urged toward the stop position or the traveling clutch lever is provided with fixing means so that the traveling clutch lever can be fixed at the traveling position. A characteristic self-propelled work vehicle.