JPH0641401U - Forward / backward switching device for agricultural work machines - Google Patents

Abstract

(57) [Abstract] [Purpose] The accelerator lever 9
Is maintained at an arbitrary adjustment position to allow the machine body 1 to travel forward at any speed, high or low, and when traveling backward, the forward-reverse traveling switching mechanism 7
The accelerator lever 9 is automatically rotated to the low speed side in conjunction with the operation lever 8 for switching the vehicle body 1 to secure the safety when the vehicle 1 travels backward. [Arrangement] An accelerator lever 9 is provided near a mounting position of an operation lever 8 for switching the forward / reverse switching mechanism 7, and the operation lever 8 is provided between the operation lever 8 and the accelerator lever 9.
There is provided an interlocking mechanism for rotating the accelerator lever 9 to the low speed side in conjunction with the operation of the operation lever 8 when the operation lever is switched to the reverse position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward / reverse switching device for agricultural working machines such as management machines, and more particularly to a forward / backward switching device for agricultural working machines in which an operating lever is provided with an operating lever for switching the forward / backward switching mechanism between forward and backward.

[0002]

[Prior art]

 Conventionally, in agricultural work machines, an operation lever for switching the forward / reverse switching mechanism installed in the mission case to the forward / reverse side is provided near the operation handle attached to the machine body, and the forward / reverse switching mechanism is operated by operating the lever. It is already known, for example, from Japanese Utility Model Laid-Open No. 2-39926 that the vehicle body is made to run in either forward or reverse direction by switching.

Further, an agricultural work machine such as a management machine is usually provided with an accelerator lever for adjusting the engine rotation speed on the hand side of the operation handle, and when the machine body is traveling forward, the accelerator lever is swayed. By dynamically adjusting the engine speed to high and low speeds, the aircraft can be moved forward at any high or low speed.On the other hand, when the aircraft is traveling backward, the accelerator lever can be returned to the low speed side. The engine speed is adjusted to a low speed and the aircraft is made to travel backward at a low speed to ensure safety during backward travel.

[0004]

[Problems to be solved by the device]

 However, conventionally, since an operation lever for switching the forward / reverse switching mechanism and an accelerator lever for adjusting the rotation speed of the engine are provided independently of each other, when performing reverse traveling of the aircraft, It is necessary to return the accelerator lever to the low speed side and then use the operation lever to switch the forward / reverse switching mechanism to the reverse side to drive the aircraft backward at a low speed. By operating the two levers during traveling, the vehicle is traveling backward at a low speed to ensure safety during traveling backward. For this reason, when the forward / reverse switching mechanism is switched to the reverse side by the operation lever to perform the reverse running of the aircraft, it may be a little forgotten to return the accelerator lever to the low speed side, and the accelerator lever is moved to the high speed side. It was very dangerous because the vehicle could be moved backwards at a high speed while the vehicle was running backwards with the operation lever while it was still in the position.

The present invention has been made in view of the above problems, and an object thereof is to freely adjust the engine speed by swinging the accelerator lever when the vehicle is traveling forward, When the aircraft is allowed to run forward at any speed, high or low, and when the aircraft is running in reverse, when the forward / reverse switching mechanism is switched to the reverse side by the operation lever, the accelerator is interlocked with the operation lever. Automatically return the lever to the low speed side, that is, forgetting to return the accelerator lever to the low speed side during backward traveling of the aircraft, make sure to keep the speed low when traveling backward of the aircraft. Another objective is to provide a forward / reverse switching device for agricultural work machines that can ensure safety during reverse travel.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a forward / reverse switching device for an agricultural work machine in which an operating lever 5 is provided with an operating lever 8 for switching the forward / backward switching mechanism 7 to forward / backward. Is provided with an accelerator lever 9 for adjusting the rotation speed of the engine 2, and between the operation lever 8 and the accelerator lever 9, when the operation lever 8 is operated to switch to a reverse position, the operation lever 8 is operated. An interlocking mechanism for rotating the accelerator lever 9 to the low speed side is provided in conjunction with the.

[0007]

[Action]

 In the above configuration, when the agricultural working machine is moved forward, the forward / reverse switching mechanism 7 is switched to the forward side by operating the operation lever 8 and the accelerator lever 9 is adjusted to a high / low speed arbitrary position, thereby The rotation speed of the engine 2 is adjusted and maintained based on the adjustment position of the accelerator lever 9, and when the agricultural work machine is traveling backward, the operation lever 8 is operated to switch the forward / reverse switching mechanism 7 to the reverse side. In addition, it is necessary to return the accelerator lever 9 to the low speed side to set the rotation speed of the engine 2 to a low speed and to make the agricultural work machine travel backward at a low speed to ensure safety during the reverse travel. At the time of switching operation of the forward / reverse switching device 7 to the reverse side by the operation lever 8, by a connecting mechanism provided between the accelerator lever 9 and the operation lever 8, Note that the accelerator lever 9 is automatically turned to the low speed side in conjunction with the operation of the operation lever 8, that is, when the farm work machine travels backward, forgetting to return the accelerator lever 9 to the low speed side. It is possible to prevent this from happening, and the speed is always set to a low speed when traveling in reverse, which ensures the safety when traveling in reverse.

[0008]

【Example】

 FIG. 4 shows a management machine as an example of an agricultural working machine to which the forward / reverse switching device of the present invention is applied. The management machine has an engine 2 mounted on the upper front part of the machine body 1 and the rear side of the machine body 1. The mission case 3 is disposed on the lower side of the mission case 3, the driving wheels 4 interlocking with the engine 2 are supported on both sides of the lower part of the mission case 3, and an operation handle 5 extending rearward is provided on the mission case 3. On the other hand, a cultivating device 6 is connected to the rear side of the mission case 3 while being mounted.

Further, the above-described control machine is provided with a forward / reverse switching device for switching the machine body 1 to the forward / backward traveling side. This forward / backward switching device, as shown in FIG. A forward / reverse switching mechanism 7 is provided inside the session case 4, and an operating lever 8 for switching the forward / backward switching mechanism 7 to a forward / rearward traveling position is attached near the rear grip 51 of the operation handle 5 so as to be vertically swingable.

Briefly described, the forward / reverse switching mechanism 7 is connected to the operation lever 8 via a connecting tool 71 such as an operating wire, and the connecting tool 71 associated with the swing operation of the operating lever 8 is described. The operating body 72 that is swung by the pushing and pulling operation of the operating body 72, the hawk shaft 73 that is moved forward and backward by the swinging of the operating body 72, the shift rod 74 fixed to the hawk shaft 73, and the shift rod 74. The front and rear of the hawk shifter 76, which is moved by, and has the locking claws 75 and 75 on both sides, and the engaging claws 77 and 78 which are selectively engaged with the locking claws 75 of the hawk shift 76. With the advancing side sprockets 79 and 80, the operating body 72 is swung by the operation lever 8 through the connecting tool 71, and the hawk shift 76 is moved by the shift rod 74 accordingly. , Each locking claw of the hawk shift 76 By selectively engaging 75 with the engaging claws 77, 78 of the respective sprockets 79, 80, the rotational power from the engine 2 is transmitted to the drive wheel 4 side in either forward or reverse state. The vehicle 1 is configured to selectively perform forward traveling and backward traveling.

Further, as is apparent from FIG. 1, the operation lever 8 is provided with a support 81 on the lower side near the grip 51 of the operation handle 5, and a shaft 82 extending in the horizontal direction on the support 81. It is supported so that it can swing up and down.

Therefore, in the above configuration, the accelerator lever 9 for adjusting the rotation speed of the engine 2 is provided at the position where the operation lever 8 is arranged, and the accelerator lever 9 is provided between the operation lever 8 and the accelerator lever 9. When switching to the reverse position by operating the operation lever 8, an interlocking mechanism for rotating the accelerator lever 9 to the low speed side in association with the operation of the operation lever 8 is provided. Specifically, as clearly shown in FIGS. 1 to 4, an accelerator lever 9 for adjusting the rotation speed of the engine 2 is fixed on the upper side of the operation lever 8 near the mounting position of the operation lever 8. A lever spring 11 for supporting the accelerator lever 9 to a low speed rotation position is provided between the accelerator lever 9 and the fixing member 10, and the accelerator lever 9 is fixed to the fixing member 10 side. A pressing spring 12 is provided to hold the adjusting position of the accelerator lever 9 by pressing against the lever spring 11 to give a rotational resistance that overcomes the rotation by the lever spring 11, while the accelerator lever 9 and the operating lever 8 are combined. When the operation lever 8 is switched to the reverse position by operating the operation lever 8, the operation lever 8 operates in conjunction with the operation lever 8 to release the rotational resistance of the pressing spring 12 to release the access. It was provided with interlocking member 13 to rotate the lever 9 to the low speed side.

More specifically, the accelerator lever 9 has a cylindrical mounting base 91 that is swingably supported on the fixed member 10 side, and an operation that extends radially outward from the mounting base 91. And a leg portion 93 which is elastically contacted to the fixing member 10 side is provided on the lower side of the mounting base 91, and a large diameter first hole portion 94 is provided on the upper side inside the mounting base 91. And a small diameter second hole portion 95 is formed on the lower side so as to be communicated with each other, and at a middle portion between the first and first hole portions 94 and 95, the second hole portion 95 projects radially inward. A step 96 is formed. In FIGS. 1 and 2, reference numeral 97 is a cap that closes the upper side of the first hole 94 in the mounting base 91.

Further, the fixing member 10 has a receiving surface 10a formed on the upper surface side for receiving the lower end side of the leg portion 93 provided on the accelerator lever 9, and the second hole is formed on the upper center side of the receiving surface 10a. A first shaft portion 10b inserted into the portion 95, a second shaft portion 10c protruding into the stepped portion 96 on the upper side of the first shaft portion 10b, and further the second shaft portion 10c. The second shaft portions 10d each having a small diameter and protruding toward the first hole portion 94 side are integrally provided on the upper side of each of the shafts, and the inner side of the shaft center of the fixing member 10 has a large diameter downward. The spring-accommodating space 10e is formed with the small-diameter shaft holes 10f on the upper side. Further, a friction plate 10g is provided between the receiving surface 10a of the fixing member 10 and the leg portion 93 of the accelerator lever 9 so that the pressing spring 12 rotates the accelerator lever 9 with respect to the fixing member 10 side. The resistance is increased so that the adjusting position of the accelerator lever 9 can be securely held, and the fixing member 10 is located near the attaching position of the operating lever 8 on the operating handle 5 via the attaching band 10h on the upper side. Fixed.

Then, the second hole portion 95 and the step portion 96 provided in the attachment base portion 91 of the accelerator lever 9 are respectively fitted into the first shaft portion 10b and the second shaft portion 10c of the fixing member 10. In addition, the third shaft portion 10d of the fixing member 10 is projected into the first hole portion 94 side of the accelerator lever 9, and the accelerator lever described above is inserted through the first to third shafts 10b, 10c, 10d. 9 is supported so as to be rotatable and movable in the axial direction, and a pressing surface that presses the upper surface side of the stepped portion 96 in the space between the first hole portion 94 and the third shaft portion 10d. The annular pressing body 98 having 98a is interposed, and the inner peripheral portion of the pressing body 98 and the outer peripheral portion of the third shaft 10d are spline-fitted to each other so that the pressing body 98 is attached to the third shaft 10d. It is non-rotatable and axially movable with respect to The lever spring 11 is locked between a part of the upper surface side of the pressing body 98 and a part of the inner wall of the first hole 94 of the accelerator lever 9 so that the lever spring 11 constantly operates the accelerator lever 9. It is urged to rotate to the low speed side.

Further, it is inserted from the first hole portion 94 provided on the upper side of the accelerator lever 9 to the lower side through the upper shaft hole 10f of the fixing member 10, the spring accommodating space 10e and the operation handle 5. An interlocking body 13 formed of an axial rod is provided, and a washer 15 abutting against the pressing body 98 is supported on the upper end side of the interlocking body 13 via a fixing tool 16, and the interlocking body 13 is longitudinally intermediate. At the upper side position of the operation handle 5, a receiving plate 17 abutting against the upper wall surface of the operating handle 5 is fixed, and the receiving plate 17 and the second shaft portion 10c provided on the fixing member 10 are fixed. The pressing spring 12 having a larger spring force than that of the lever spring 11 is interposed between the lower surface and the lower surface.

Then, the interlocking body 13 is constantly urged downward by the pressing spring 12, and accordingly, the pressing body 98 is pressed downward by the washer 15, and further, the pressing body 98 The leg portion 93 of the accelerator lever 9 is pressed against the receiving surface 10a of the fixing member 10, and a rotational resistance force is applied to the accelerator lever 9 via friction plates 10g provided on the leg portion 93 and the receiving surface 10a. As a result, the adjusting position of the accelerator lever 9 can be held.

Further, on the operation lever 8 side, when the forward / reverse switching mechanism 7 is switched to the reverse side by the operation of the operation lever 8, the interlocking body 13 is interlocked with the operation of the operation lever 8. The operating arm 19 is provided for releasing the rotational resistance force of the pressing spring 12 with respect to the fixed member 10 side of the accelerator lever 9 by operating the.

That is, as is apparent from FIG. 1, the operation arm 19 has its tip end side fixed to a front position where the accelerator lever 9 is attached to a base of the operation lever 8 which is attached to the support 81. The mounting body 18 is supported so as to be vertically movable via a pivot shaft 20, and a long hole 21 extending in the front-rear direction is formed on the rear side of the operation arm 19, and the operation lever 8 is provided in the long hole 21. The interlocking body 13 is engaged with an intermediate position in the lengthwise direction of the operation arm 19 while inserting the projecting rod 22 projecting therefrom.

When the forward / reverse switching mechanism 7 is switched to the reverse side by the operation of gripping the operating lever 8, the projecting rod 22 is moved within the range of the elongated hole 21 as the operating lever 8 swings. On the other hand, the operation arm 19 is moved up about the pivot shaft 20 as shown by the chain line in FIG. 1, and the interlocking body 13 is moved up accordingly. The pressing and holding of the accelerator lever 9 at a predetermined position with respect to the fixed member 10 side and the release of the pressing and holding force of the pressing spring 12 with respect to the fixing member 10 of the accelerator lever 9 are performed.

That is, as shown by the solid line in FIG. 1, when the grip operation of the operating lever 8 is released and the forward / reverse switching mechanism 7 is switched to the forward side, as shown in FIG. The body 13 is moved downward by the pressing action of the pressing spring 12, and accordingly the pressing force of the pressing spring 12 is applied to the accelerator lever 9 side via the plate member 15 and the pressing body 98. Then, the accelerator lever 9 is pressed and held at a predetermined position on the fixing member 10 side, and by this pressing, the accelerator lever 9 is maintained at an arbitrary position where the rotation speed of the engine 2 is adjusted. From the above state, when the operation lever 8 is grasped and the forward / reverse switching mechanism 7 is switched to the reverse side as shown by the phantom line in FIG. 1, as shown in FIG. , The pressing spring 12 which is moved to the upper side of the interlocking body 13 via the operation arm 19 and is moved upward by the washer 15 and is applied to the accelerator lever 9 side via the pressing body 98. The pressing force is released and the accelerator lever 9 is returned to the low speed position by the lever spring 11 so that the engine 2 is always kept at a low speed when the vehicle 1 travels backward.

Next, the operation of the forward-reverse switching device described above will be described. First, when the machine body 1 is moved forward, as shown by the solid line in FIG. 1, the operation lever 8 is released and the lever 8 is positioned on the lower side, whereby the forward / reverse switching mechanism 7 is moved to the forward side. The engine speed is switched, and the accelerator lever 9 is switched to a high / low speed arbitrary position to arbitrarily adjust the rotational speed of the engine 2. In this case, the pressing spring 12 for pressing and holding the accelerator lever 9 on the side of the fixing member 10 is interposed between the accelerator lever 9 and the fixing member 10, and the pressing spring 12 is It is set to be larger than the spring force of the lever spring 11 provided for urging the accelerator lever 9 to the low speed side, and the rotation resistance of the magnitude that overcomes the turning force of the lever spring 11 is on the accelerator lever 9 side. As shown in FIG. 2, when the accelerator lever 9 is switched to the high / low speed arbitrary position, the accelerator lever 9 is pushed by the pressing force of the pressing spring 12 to the fixing member 10 side. The accelerator lever 9 is held at a predetermined switching position, and the rotational speed of the engine 2 based on the switching position of the accelerator lever 9 is adjusted and maintained.

On the other hand, when the machine body 1 is moved backward, as shown by the phantom line in FIG. 1, by grasping the operation lever 8 and operating it upward, the forward / reverse switching mechanism 7 is moved to the reverse side. In addition to switching, the accelerator lever 9 is automatically returned to the low speed side in conjunction with the operation lever 8 so that the rotation speed of the engine 2 can be reduced to a low speed, and the body 1 is made to travel backward at a low speed. It is possible to ensure safety while driving. In this case, as shown in FIG. 2, the interlocking body 13 provided on the accelerator lever 9 side is operated in association with the operation of the operation lever 8, and the pressing spring 12 is operated by the operation of the interlocking body 13. The pressing force applied to the accelerator lever 9 is released, and therefore the spring force of the lever spring 11 provided for urging the accelerator lever 9 toward the low speed side causes the accelerator lever 9 to operate as described above. It is automatically turned to the low speed side in conjunction with the lever 8, that is, it is prevented from forgetting to switch the accelerator lever 9 when the vehicle 1 travels backward, and the vehicle 1 is not traveled when traveling backward. Is always set to a low speed, which ensures safety when traveling in reverse. Although the interlocking body 13 is provided on the accelerator lever 9 side in the embodiment described above, it may be provided on the operation lever 8 side, that is, the operation arm 19 in the embodiment structure.

Further, in the above embodiment, the interlocking body 13 may be brought into contact with the operation arm 19 by the operation of the operation arm 19 and only moved upward, but may be continuous with the operation arm 19. . Further, the reason why the operation arm 19 is provided separately from the operation lever 8 is to regulate the upward stroke, and the operation arm 19 is not particularly necessary.

[0025]

[Effect of device]

 As described above, according to the present invention, in the forward / reverse switching device for an agricultural work machine in which the operating handle 5 is provided with the operating lever 8 for switching the forward / backward switching mechanism 7 to the forward / backward direction, the engine lever is provided at the position where the operating lever 8 is disposed. 2 is provided with an accelerator lever 9 for adjusting the number of revolutions, and is interlocked with the operation of the operation lever 8 when the operation lever 8 is operated to switch to a reverse position between the operation lever 8 and the accelerator lever 9. Since an interlocking mechanism for rotating the accelerator lever 9 to the low speed side is provided, the accelerator lever 9 can be arbitrarily adjusted by adjusting the accelerator lever 9 to a high and low speed arbitrary position when the agricultural working machine travels forward. While it can be held in the position and the forward traveling of the machine body 1 can be performed at any high or low speed, the operation lever 8 is operated to perform the forward traveling of the agricultural work machine. By switching the reverse drive switching mechanism 7 to the reverse drive side, the interlocking mechanism provided between the accelerator lever 9 and the operating lever 8 automatically turns the accelerator lever 9 to the low speed side in conjunction with the operating lever 8. Therefore, it is possible to prevent forgetting to return the accelerator lever 9 to the low speed side when the agricultural work machine travels backward, and the speed is always low when traveling backward. It is possible to ensure the safety when traveling in reverse.

[Brief description of drawings]

FIG. 1 is a side view showing a forward / reverse switching device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a main part of the forward-reverse switching device, showing a state during forward movement.

FIG. 3 shows a state of the forward-reverse traveling switching device when traveling in reverse.

FIG. 4 is a side view of a management machine shown as an example of an agricultural work machine to which the forward / reverse switching device is applied.

[Explanation of symbols]

 2 engine 5 operation handle 7 forward / reverse switching mechanism 8 operation lever 9 accelerator lever

Claims (1)

[Scope of utility model registration request] 1. A forward / reverse switching device for an agricultural work machine in which an operating lever 5 is provided with an operating lever 8 for switching the forward / backward switching mechanism 7 to a forward / backward direction. Providing an accelerator lever 9 to adjust the number,
An interlocking mechanism between the operation lever 8 and the accelerator lever 9 that rotates the accelerator lever 9 to a low speed side in conjunction with the operation of the operation lever 8 when switching to a reverse position by operating the operation lever 8. A forward-reverse switching device for agricultural work machines, which is provided with.