JPS6235933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a walking mobile agricultural machine used for mid-cultivation management of orchards.

In the above-mentioned walk-behind mobile agricultural machine, if the gear shift lever gets caught on an overhanging branch or the like during work, or if a sharp turn is made, the gear shift lever moves due to the inertia of the gear shift lever, causing the gear shift position to become neutral. There was a risk of an accident resulting in work being interrupted. Therefore, as a solution, a restraining member that prevents the shift position from being changed is provided in the traveling transmission mechanism.
It has been considered to provide the gear shift operating lever with an operating tool for canceling the action of the restraining member, but in order to carry out normal gear shifting operations, it is necessary to engage and close the clutch and operate the gear shift operating lever. According to this configuration, it is also necessary to perform an operation to release the check member, which has the disadvantage that the speed change operation becomes extremely troublesome.

In view of the above points, the present invention aims to prevent accidental movement of the gear shift operating lever during work by simply performing operations essential for gear shifting operation, that is, to improve operability of gear shifting operation. The purpose is to avoid the above-mentioned risks of accidents during work without causing any damage.

In order to achieve the above object, the present invention is characterized in that the shift fork shaft for traveling transmission is slid in the axial direction on the end of the shift fork shaft for traveling transmission that protrudes from the transmission case. In a walk-behind mobile agricultural machine equipped with an engaging member that is engaged and connected to a speed change operation lever that changes speed of a traveling speed change mechanism in a transmission case, sliding movement of the shift fork shaft in the axial direction is performed. A check member to prevent and check the gear shifting operation,
The engaging member attached to the end of the shift fork shaft is provided to be swingable in a direction intersecting the locus of movement, and the engaging member is provided with a shaft at a predetermined shift operation position by the shift fork shaft. of,
an engaging portion that allows the check member to engage; and a contact surface that prevents the check member from engaging at a position in the middle of the shift operation other than the predetermined shift operation position of the shift fork shaft; , the tensioning state in which the engaging portion of the engaging member is engaged in conjunction with the engaging operation of the clutch operating lever, which engages and switches the main clutch that intermittents the power into the transmission case, and the disengagement of the clutch operating lever. A linking mechanism is provided which switches the engagement to the released check release state in conjunction with the operation, and its effects are as follows.

In other words, by providing a check member that prevents the shift movement of the shift fork shaft for traveling gear changes, it is possible to prevent unexpected gear change operations that occur during work. Since it is linked to the main clutch so that the check is released when the main clutch is disengaged in the operating state, the check member can be released without any special operation by simply operating the clutch necessary for normal gear shifting operations. can be released from restraint and put into a restraining state,
Accidents caused by unexpected movement of the gear shift control lever can be avoided without impairing operability, and it has now become possible to provide a walking-type mobile agricultural machine that is excellent in both safety and operability.

Next, an example of the configuration of the present invention will be shown.

As shown in FIG. 1, a frame 4 extends from a transmission case 3 that supports a tiller 1, various attachments, and a replaceable axle 2, and an engine 5 is mounted thereon.
A double-tension type main clutch 6 is equipped on the belt transmission device constructed over the period of time, and a control handle 8 is attached to the transmission case 3 via a mounting bracket 7 to form a walk-behind cultivator. .

As shown in FIG. 2, two shift fork shafts 9a and 9b are provided in the transmission case 3 so that they can be pushed or pulled freely from a neutral position, so that three forward gears and one reverse gear can be changed. There is. As shown in FIGS. 2 and 3, the shift fork shaft 9a,
Engagement members 11, 11 fixed to each end of 9b
First recesses 12 are provided in vertically opposing positions, respectively, and an operating arm 13a extending from a shift operating lever 13, which can swing vertically and horizontally, is selectively engaged in these first recesses 12, 12. The structure is such that an arbitrary shift position can be obtained.

As shown in FIGS. 3 and 4, each of the engaging members 11, 11 has a second recess 14 on its lower side as an engaging portion that allows a restraining member 10, which will be described later, to engage therein, and , an outer surface 11a, and an inner surface 11b, and each shift fork shaft 9a, 9b is provided at the front and rear sides of the second recess 14 in the axial direction of the shift fork shafts 9a, 9b.
When the control member 10 is in an intermediate operation position that does not reach the predetermined shift operation position, the check member 10 in that state
A restraining member 10 is attached to the side surface of the transmission case 3 to prevent the shift fork shafts 9a and 9b from being locked, and a restraining member 10 that can freely swing around the transverse axis P of the machine body is attached to the side surface of the transmission case 3. When in position, the restraining member 10 engages both shift fork shafts 9a, 9.
The restraining member 10 engages in the second recesses 14, 14 of b to restrain the movement of both shift fork shafts 9a, 9b, and when one of the shift fork shafts 9a, 9b is pushed and shifted. It acts on the outer surface 11a of the member 11, and similarly acts on the inner surface 11b of the member 11 when the drawer is shifted, and when the check member 10 is acting, the shift fork shafts 9a, 9b Both of them are configured to check their movement.

On the other hand, as shown in FIGS. 1 and 2, a pair of tension arms 15a and 15b in the double tension type main clutch 6 and a clutch operating lever 16 provided on the control handle 8 are connected by a wire 17,
17, the wires 17, 17 are linked by moving the lever 16 left and right, and the selected tension arm 15a or 15b can be operated by swinging the lever 16 back and forth. The main clutch can be turned on and off at the same time. As shown in FIGS. 2 and 3, two holes 18 are provided in the check member 10,
The wires 17, 17 are passed through each of the wires 17, 18, and springs 19, 19 that press and support the restraining member 10 upward are fitted onto the wires 17, 17, respectively.
When the main clutch 6 is engaged and operated by swinging the lever 16 forward, one of the wires 17, 17 is pulled and the spring 20
When the restraining member 10 acts on the members 11, 11 of the shift fork shafts 9a, 9b against the bias of the gear shift restraining state, and the lever 10 is swung rearward to disengage the main clutch 6, wire 17,
17 are returned, the restraining member 10 is separated from the member 11 by the urging force of the return spring 20 to be in a non-restraint state, and the wires 17, 17 and the spring 20 form an interlocking mechanism. There is.

Next, another embodiment will be described.

In order to link the check member 10 and the clutch 6, the fifth
As shown in the figure, the restraining member 10 is
is biased toward the restraining release side, and a wire 22 dedicated to operating the restraining member 10 extended from the clutch operation lever 16 is connected to switch the restraining member 10 between an active state and a non-active state in response to the clutch on/off operation. The configuration may be modified in various ways.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking type mobile agricultural machine according to the present invention, and FIG. 1 is an overall side view of the walking type tiller, and FIG.
The figure is a side view of the main part, Figure 3 is a perspective view of the main part, and Figure 4 is a side view of the main part.
The figure is a bottom view of the main part, and FIG. 5 is a side view of the main part showing another embodiment. 3...Mission case, 6...Main clutch,
9a, 9b...shift fork shaft, 10...checking member, 11...engaging member, 11a, 11b, 14
...Engaging portion, 11c... Contact surface, 13... Speed change operating lever, 16... Clutch operating lever.

Claims (1)

[Claims] 1 The traveling transmission shift mechanism inside the transmission case 3 is constructed by sliding the shift fork shafts 9a, 9b in the axial direction on the outer projecting ends of the traveling transmission shift fork shafts 9a, 9b that protrude from the transmission case 3. In a walk-behind mobile agricultural machine equipped with engaging members 11, 11 that are engaged and connected to a speed change operation lever 13 for changing speeds, the shift fork shafts 9a, 9b can be slid in the axial direction. A restraining member 10 for inhibiting and restraining the gear shifting operation
are provided to be swingable in a direction intersecting the movement trajectory of the engaging members 11, 11 attached to the ends of the shift fork shafts 9a, 9b, and
The engagement members 11, 11 have a predetermined gear shift operation position by the shift fork shafts 9a, 9b.
Engagement portions 14 and 11 that allow engagement of the restraining member 10
a, 11b, and abutment surfaces 11c, 11c are formed to prevent the engagement at intermediate positions of the shift fork shafts 9a, 9b other than the predetermined shift operation positions. ,
Clutch operating lever 1 that operates the main clutch 6 that connects and disconnects power to the transmission case 3
A check state in which the engaging portions 14, 11a, 11b of the engaging member 11 are engaged in conjunction with the engagement operation of 6, and a check state in which the engagement is released in conjunction with the cutting operation of the clutch operating lever 16. A walking type mobile agricultural machine characterized by being provided with a linkage mechanism for switching to a released state.