JPS6227459Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gear shift operation device that is mainly installed in a walk-behind cultivator, and more specifically, a shift fork for switching forward and backward movement of the machine and a shift fork for changing the operating speed of a working device. are arranged in different positions vertically and are provided so as to be operated to swing in horizontal directions substantially parallel to each other, and each operating lever for both shift forks is provided to swing around a vertical axis, respectively. Regarding a shift operating device for a mobile agricultural machine that is operable, its purpose is to provide a mutual check mechanism for reverse operation, that is, to prevent the machine from moving forward or backward when the operating lever of the operating device is at a shift operating position other than the neutral shift position. A mechanism for preventing both the backward operation swing of the switching operation lever and the speed change operation rotation of the operation lever of the work device when the operation lever for switching the machine forward and backward movement is in the reverse operation position is provided on the work device. It is an object of the present invention to enable a simple structural modification of the operating lever and the operating lever for switching forward/backward movement of the aircraft so that it can be constructed compactly and advantageously in terms of manufacturing.

First, an embodiment of the present invention will be described based on the drawings.

As shown in Fig. 1, inside the transmission case 3 connected to the rear part of the frame 2 for mounting the engine 1,
Axles 4, 4 protruding outside this transmission case 3
The transmission system to the shaft (hereinafter referred to as PTO shaft) 5 constituting the power take-off device includes a mechanism 6 that can change the aircraft running to three forward speeds and one reverse speed, and the above-mentioned mechanism 6.
A rotary tiller B is fixedly connected to the rear of the machine A, which has a mechanism 7 that can change the drive speed of the PTO shaft 5 in two high and low steps, and
A walk-behind cultivator is equipped with a chain transmission device 9 installed between the PTO shaft 5 and the input shaft 8 of the tiller B for interlocking both shafts 5 and 8. The gear shift operating device is constructed as follows.

That is, as shown in FIGS. 2 and 3, the traveling system transmission mechanism 6 is provided in the transmission case 3.
A first shift piece member (first shift fork) 10 that can be shifted from the shift neutral position N to the reverse operation position R and the forward low speed position _F1 , and from the shift neutral position N to the forward middle speed position _F2 and the forward high speed position F 2nd shift piece member (2nd shift fork) 11 that can be shifted to ₃
a swinging operation shaft (operation lever) 12 for the
The rotational operating shaft (operating lever) 14 of the PTO system transmission mechanism 7 is connected to the vertical axis P with respect to the shift piece member (shift fork) 13 that can be shifted from the neutral shifting position N to the high speed operating position H and the low speed operating position L. , P, and one rotary operation shaft 14 for the lower gear shift piece member 13 is arranged to be swingable around P, and the other rotary operation shaft 1 for the upper gear shift member 10
A vertical rod portion 14b extending above and below the vertical rod portion 14b, and horizontal rod portions 14a, 1 continuous to both the upper and lower ends of the vertical rod portion 14b.
4c, and furthermore, the vertical rod portion 14b of one of the rotational operation shafts 14 has both free ends 15a, 15b as the rotational operation shaft 14 is rotated. An arm 15 that can be moved close to the swing operating shaft 12 and the first shift piece member 10 is fixed to the side, and these arms are moved close to both free ends 15a and 15b of the arm 15. Members 16 and 17 that can come into contact with each other are integrally connected to the swing operation shaft 12 and the first shift piece member 10, so that the rotation operation shaft 14 is in a high-speed operation position H other than the shift neutral position N. Or, when in the low-speed operation position L, the swing operation shaft 12 moves backward due to the contact between one free end 15a of the arm 15 and one member 16 or the other free end 15b and the other member 17. When the operation swing is prevented and the swing operation shaft is in the reverse operation position R, the other free end 15b of the arm 15 and the other member 17, or the one free end 15a and the one member 16 The rotation operation shaft 14 is configured to be prevented from rotating to the high speed operation position H or the low speed operation position L by contacting with the rotation operation shaft 14.

Further, by shifting the rotation operation shaft 14 in the direction of its rotation axis from outside the mission case 3, the arm 15 can be repositioned from the check release position a to the check release position b. The rotation operation shaft 14 is arranged between the rotation operation shaft 14 and the mission case 3.
A detent mechanism 18 is provided to lock and hold the arm 15 at the two positions a and b via the detent mechanism 18. This detent mechanism 18 includes circumferential grooves 19, 19 formed at two locations in the axial direction of the rotation operation shaft 14, and a ball 20 that can be selectively engaged with both circumferential grooves 19, 19.
It also includes a spring 21 that biases the ball 20 in the engagement direction, and a bolt 22 that can adjust the force of the spring 21 to bias the ball 20 into engagement.

Incidentally, both the members 16 and 17 may be fixed to the swing operation shaft 12 so as to mutually check backward plowing as described above.

In summary, the shift operation position of the mobile agricultural machine according to the present invention is as follows:
A vertical rod portion 14b that extends above and below the other operating lever 12 for the upper shift fork 10, and a horizontal rod portion 1 that extends from both the upper and lower ends of the vertical rod portion 14b.
4a, 14c, and both free ends 15a, 15b are formed in the vertical rod portion 14b of one of the operating levers 14 as the operating lever 14 swings. An arm 15 is fixed to the operating lever 12 side of the arm 15 and is movable toward the operating lever 12, and a member that can come into contact with or engage with the free ends 15a and 15b of the arm 15 when these end portions approach each other. 16,17
is provided on the other operating lever 12 side, and
When the operating lever 14 is at a shift operation position other than the shift neutral position, one free end (15a or 15b) of the arm 15 contacts or engages with one member (16 or 17), thereby causing the other member (16 or 17) to When the reverse operation swing of the operation lever 12 is prevented, and the other operation lever 12 is in the reverse operation position,
The other free end of the arm 15 (15b or 15
a) and the other member (17 or 16) are configured to prevent the speed change operation of the one operating lever 14, so that it is possible to prevent the reverse operation. Mutual check mechanism, that is, when the operation lever of the working device is in a gear shift operation position other than the gear shift neutral position, the operating lever for switching forward and backward movement of the aircraft swings backward, and when the lever for switching forward and backward movement of the aircraft is in the reverse operation position A mechanism for preventing both gear change operation rotation of the operating lever 14 of the working device is attached to the vertical rod portion 14b of the operating lever 14 that changes the shape of the operating lever 14 relative to the lower shift fork 13. It has now been possible to configure the structure by simply modifying the arm 15, the other operating lever 12, and the shift fork 10 with abutting members 16 and 17 for the arm 15.

Furthermore, as in the above embodiment, when the arm 15 is configured to be able to change its position from the check position to the check release position by shifting the operating lever in the direction of the swing axis; teeth,
Not only can it be easily switched between the mutual checking state and the non-checking state as described above, but the structure for this purpose can also be easily configured using the operation lever.

[Brief explanation of the drawing]

The drawings show an embodiment of the speed change operation device for a mobile agricultural machine according to the present invention, and FIG. 1 is an overall side view of a walking type mobile agricultural machine, FIG. 2 is a perspective view of the speed change operation position, and FIG.
FIG. 4 is an enlarged sectional view of the main parts. 10...Shift fork for switching forward and backward movement of the aircraft, 1
2, 14... Operating lever, 13... Shift fork for changing gears of working equipment, 14b... Vertical rod portion, 14
a, 14c...Horizontal rod part, 15...Arm, 15
a, 15b...free end portion, 16, 17... member.

Claims (1)

[Claims for Utility Model Registration] 1. A shift fork 10 for switching forward/backward movement of the aircraft and a shift fork 13 for changing the operating speed of the working device are arranged at different positions vertically and are approximately opposite to each other. Each operating lever 1 for both the shift forks 10 and 13 is provided so as to be swingable in parallel lateral directions.
2 and 14 are provided so as to be swingable around vertical axes P and P, respectively.
The other operating lever 12 is formed into a crank shape, consisting of a vertical rod portion 14b that extends above and below the other operating lever 12, and horizontal rod portions 14a and 14b that extend from both the upper and lower ends of the vertical rod portion 14b. In the vertical rod portion 14b,
An arm 15 whose free ends 15a and 15b can move contrarily toward the other operating lever 12 side as the operating lever 14 swings.
and a member 16 that can abut or engage with the free ends 15a and 15b of the arm 15 when they move close to each other.
17 is provided on the other operating lever 12 side, so that when the operating lever 14 is at a shift operating position other than the shifting neutral position, one free end (15a or 15b) of the arm 15 and one member (16 or 17) to prevent the other operating lever 12 from swinging backward, and when the other operating lever 12 is in the backward operating position, the other operating lever 12 is in the reverse operating position. The free end (15b or 15a) and the other member (17
or 16), the speed change operation device for a mobile agricultural machine is configured to prevent the speed change operation of the one operating lever 14 by contacting or engaging with the control lever 14. 2. The speed change operating device for a mobile agricultural machine according to claim 1, wherein both the members 16 and 17 are integrally connected to the other operating lever 12 and the shift fork 10. 3 The arm 15 is connected to the one operating lever 14
The speed change operating device for a mobile agricultural machine according to claim 1, which is configured to be able to change its position from the check position to the check release position by shifting in the direction of the swing axis. .