JPH0361063B2 - - Google Patents

Abstract

PURPOSE:To make a check to a positive backward high speed position performable without requiring any special operation, by making operating physical force for a speed change operating device utilizable to a check member, in case of a device having the check member which prohibits any transition to the backward high speed position of the speed change operating device. CONSTITUTION:A mobile farm working machine is provided with a main gearshift lever 10 operating a main gear shifter selectable to plural forward-backward steps and a sub-gearshift lever 11 operating a transfer selectable to two high-low steps. Each of these levers 10 and 11 is situated in both main and auxiliary guide holes 12A and 12B, and transition of the main gearshift lever 10 to a backward high speed position is made to be prohibitible by a check member 13. In this case, there is provided with a travel controlling member 18 situated in a position where travel to a check release position is prohibited at a time when the check member 13 is in a check position. At the time of transition to a shift position different from the backward high speed position of the gearshift lever 10, a contact part 13B, moving the check member 13 to the check position from the check release position due to contact of the said lever 10, is formed in the check member 13.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a working machine connection section at the rear of a self-propelled machine, a control handle extending rearward from the self-propelled machine, and a gear shift operating tool. The present invention relates to a speed change operation structure for a walking type mobile agricultural machine, which is provided with a speed change operation check member that is movable between a check position that prohibits the transition to a high speed reverse position and a check release position that allows the transition to the high speed reverse position.

[Conventional technology]

The above-mentioned walking-type mobile agricultural machine can also be used as a transport vehicle by connecting a trailer loading platform to the working machine connection part. When carrying out transport work by connecting trailer loading platforms, it is required to improve maneuverability, so a transmission structure that can be changed to two speeds, low speed and high speed, is often used even when reversing.

However, when performing tillage work by connecting a rotary tiller to the work equipment connection part, if the high-speed operating tool is unconsciously operated to the reverse high-speed position and the self-propelled machine moves backward at high speed, it may run into the operator who is walking. It is dangerous to do so. Therefore, the above-mentioned shift operation check member is provided so that the shift of the shift operation tool to the reverse high speed position can be switched between a state in which it is prohibited and a state in which it is permitted.

Conventionally, in this type of walk-behind mobile agricultural machine, the speed change operation check member moves from a check position where it projects into the movement path of the speed change operation tool to a check release position where it retires outside the movement path, and from the check release position. The vehicle was moved to the check position by being held and moved by the operator's hand, and after being moved, the vehicle was held in that position.

[Problem that the invention seeks to solve]

However, in the case of the above-described conventional configuration, in order to move the shift operation check member from the check release position to the check position, the operator must hold and move the shift operation check member with his/her hand, which is cumbersome. In particular, if the plowing operation is performed in combination with the plowing operation without forgetting to move the gear shift operation restraining member to the restraining position after carrying out transport work using the reverse high speed as well, the reverse high speed will not be restrained. There was a fear that this would happen.

In view of the above-mentioned circumstances, an object of the present invention is to enable a shift operation check member to be moved from a check release position to a check position without requiring any special operation.

[Means for solving problems]

The characteristic configuration of the speed change operation structure for a walk-behind mobile agricultural machine according to the present invention is that the speed change operation tool moves between a check position that prohibits movement to the reverse high speed position and a check release position that allows movement to the reverse high speed position. When the possible shift operation check member is in the check position, it is in the movement restriction position that prohibits movement to the check release position, and when the speed change operation check member is in the check release position, it is in the movement permission position that allows movement to the check position. A certain movement control member is provided in a state where it is biased toward the movement restriction position, and when the speed change operation tool comes into contact with the speed change operation restraining member when the speed change operation tool moves to a speed change position different from the reverse high speed position, A contact portion is provided for pressing and moving the shift operation check member from the check release position to the check position.

[Effect]

In other words, since the movement control member is biased toward the movement restriction position, as the shift operation check member moves from the check release position to the check position, it automatically changes its position to the movement restriction position. Thereafter, movement of the shift operation check member to the check release position is prohibited. When the shift operation check member is in the check release position, the movement control member is in the movement permissible position and allows the shift operation check member to move to the check position. When the gear shift position is shifted to another shift position, the shift operation check member is pressed and moved from the check release position to the check position.

On the other hand, when moving the shift operation check member from the check position to the check release position, it is necessary to move the movement control member from the movement restriction position to the movement permissible position against the biasing force, so that the check release state may be inadvertently caused. It never appears.

〔Effect of the invention〕

As a result, the operating force on the gear shift operating tool can be used to move the gear shift operation restraining member from the restraining release position to the restraining position, eliminating the need for special operations and eliminating forgetting to operate. It has now become possible to provide a speed change operation structure for a walking type mobile agricultural machine that has good performance and can also surely check the high speed of reverse movement.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 5, an engine 3, a transmission case 4, etc. are mounted on a self-propelled body 2 that supports a pair of left and right wheels 1, and a control handle 5 extends rearward from this self-propelled body 2. It is configured as a walking type mobile agricultural machine.

At the rear of the self-propelled body 2 of this walking-type mobile agricultural machine,
A work machine connecting portion 7 is provided to connect a work machine W such as a rotary tiller 6 shown in the figure or a trailer loading platform not shown. Further, from the transmission case 4, power is transmitted from the engine 3 to an engine-driven working machine W such as a rotary tiller 6 via a transmission chain (not shown) in the chain case 8. A take-out shaft 9 is protruded.

The transmission case 4 has 4 forward speeds and 2 reverse speeds.
A main transmission device 4A that can be switched to two gears, and a sub-conversion device 4B that can be switched to two high and low gears for each gear stage of the main transmission device 4A are installed inside. The main shift lever 10 for shifting the main transmission 4A and the auxiliary shift lever 11 for shifting the auxiliary transmission 4B are extended rearward from the self-propelled aircraft 2 so as to face the control position. It's out.

The main shift lever 10, which is an example of a shift operating tool according to the present invention, is located in a main guide hole 12A formed in a guide plate 12 attached to the self-propelled aircraft body 2, as shown in FIGS. 1 and 2. ing. By positioning the main shift lever 10 in any of the guide grooves 12a to 12f of the main guide hole 12A,
It is constructed so that the above-mentioned four forward gears and two reverse gear shifting operations can be performed.

Further, the sub-shift lever 11 is located within a sub-guide groove 12B formed in the guide plate 12. By positioning the sub-shift lever 11 on either the left or right side of this sub-guide groove 12B, the above-mentioned height
It is constructed so that gear shifting operations can be performed.

A check plate 13 having a dogleg shape in plan view is provided on the lower surface side of the guide plate 12. This check plate 13, which is an example of a speed change operation check member according to the present invention, has a fulcrum.
It is attached so that it can rotate freely around P ₁ , and the first stopper pin 14 contacts the first side portion 13.
A closes the guide groove 12b corresponding to the reverse high speed;
In the first position shown in FIG.
2b, and the second side portion 13B closes the guide groove 12c corresponding to the low forward speed.
It is configured to be able to swing between the second position shown in the figure.

Further, a spring 16 is installed between the check plate 13 and the guide plate 12, and when the check plate 13 exceeds the above-mentioned two intermediate positions, the urging force of the spring 16 moves the check plate 13 in any direction. The robot is forced to move to that position.

As shown in FIGS. 3 and 4, a check pin 18 is provided on the upper surface of the guide plate 12 and is urged downward by a spring 17. This check pin 18, which is an example of a movement control member according to the present invention, is
When the check plate 13 is in the above-mentioned second position,
As shown in FIG. 4, it is located upward in the figure against the biasing force of the spring 17, and its tip rests on the upper surface of the check plate 13. In this state, the check plate 13 is allowed to move to the first position.

On the other hand, when the check plate 13 is in the first position described above, the check pin 18 moves as shown in FIG.
Due to the biasing force of the spring 17, it is located at the lower side in the figure, and its peripheral portion is in contact with the edge of the check plate 13. In this state, movement of the check plate 13 to the second position is prohibited.

Therefore, the check plate 13 prohibits the main shift lever 10 from shifting to the reverse high speed position when it is in the first position, and prevents the main shift lever 10 from shifting to the reverse high speed position when it is in the second position. Allows gear shifting operation. That is, the first position of the check plate 13 is the check position,
The second position of the check plate 13 is the check release position.
Further, the position where the lower end of the check pin 18 is placed on the check plate 13 is the movement permissible position of the check pin 18, and the position where the circumference of the check pin 18 comes into contact with the edge of the check plate 13 is the position where the check pin 18 is allowed to move. This is a movement restriction position.

On the other hand, if the main shift lever 10 is operated to move to the low-speed forward position while the check plate 13 is in the check release position, the check pin 18 is in the movement permissible position, so the check plate 13 Leher 10
moves to the restraining position by abutting and pressing the second side portion 13B. That is, the second side portion 13B of the check plate 13 serves as a contact portion that presses and moves the check plate 13 from the check release position to the check position when the shift lever 10 comes into contact with the check plate 13.

In order to move the check plate 13 from the check position to the check release position, the operator must use the spring 1.
The restraint pin 18 must be pulled up to the movement permissible position against the urging force of 7. For example, during trailer work, after the restraint plate 13 is positioned at the restraint release position and the vehicle is driven in high-speed reverse mode, Once the tiller is connected and operated at low forward speed,
The check plate 13 automatically moves to the check position without requiring any special operation.

In the previous embodiment, the restraint plate 13 as a shift operation restraint member and the restraint pin 18 as a movement control member were both attached to the guide plate 12, but instead of this, they are not shown. However, they may be attached to a different body part from the guide plate 12, and in short, the gear shift operation restraining member 1
3 may be located in the movement path of the speed change operating tool 10 in the restraining position and prohibited from moving to the reverse high speed position.

In addition, although numbers are shown in the claims section for convenience of reference to the drawings, the present invention is not limited to the structure of the accompanying drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the speed change operation structure for a walking type mobile agricultural machine according to the present invention, FIG. 1 is a plan view of the speed change operation section showing the speed change operation check member in the check position, and FIG. 2 is a plan view of the speed change operation check member in the check release position. FIG. 3 is a cross-sectional view of the speed change operation section showing the movement control member at the movement restriction position; FIG. 4 is a plan view of the speed change operation section showing the movement control member at the movement permissible position; FIG. FIG. 5 is a side view of the entire walking-type mobile agricultural machine. 2...Self-propelled aircraft, 5...Control handle, 7...
Work machine connecting portion, 10...speed change operation tool, 13...speed change operation check member, 13B...contact portion, 18...movement control member.

Claims (1)

[Claims] 1. A working machine connection section 7 is provided at the rear of the self-propelled body 2,
A control handle 5 extends rearward from the self-propelled aircraft 2, and extends between a check position where the shift operation tool 10 is prohibited from moving to the reverse high speed position and a check release position where the shift to the reverse high speed position is permitted. This is a speed change operation structure for a walking type mobile agricultural machine, which is provided with a speed change operation check member 13 that is movable with the speed change operation, and when the speed change operation check member 13 is in a check position, it is in a movement restriction position that prohibits movement to a check release position. , the movement control member 18, which is in a movement permissible position that allows movement to the check position when the shift operation check member 13 is in the check release position, is biased toward the movement restriction position; and a contact portion that presses and moves the shift operation check member 13 from a check release position to a check position by contact of the speed change operation tool 10 when the speed change operation tool 10 moves to a speed change position different from the reverse high speed position. A speed change operation structure for a walking type mobile agricultural machine equipped with 13B. 2. The speed change operation structure for a walking type mobile agricultural machine according to claim 1, wherein the speed change position other than the high speed reverse position is a low speed forward position.