JPH0332421Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a plurality of front and rear shift shafts for walking speed change including forward/backward switching of the aircraft so as to protrude laterally from the transmission case. In a tiller in which a shift shaft that controls the operation and stopping of the rotary tiller is provided in a state that protrudes laterally from the rotary case, the traveling speed change means and the rotary operation are arranged so as to prevent a backward tilling state from occurring. This invention relates to technology for mutually checking the stopping means.

[Prior art]

Conventionally, as shown in Japanese Utility Model Application Publication No. 53-158603, the shift shaft of the transmission case was configured to be operable by a traveling speed change lever that was swingable around the horizontal axis and the vertical axis. The shift shaft of the rotary case is configured to be operable by a rotary gear shift lever that can swing around the vertical axis, and is operated by a running gear shift lever for forward and backward movement of the aircraft and for switching between high and low speeds. The rotary shift lever was restrained through a link mechanism that was connected to the rotary gear shift lever.

[Problem that the invention attempts to solve]

Since the driving gear shift lever performs gear shifting by swinging around the vertical axis, the lever protrudes greatly in the lateral direction of the aircraft during gear shifting operation.
When working in an orchard, there is an inconvenience that the lever may hit a tree or branch and cause the gear shift lever to switch unexpectedly.Also, when working in an orchard, a link member is required to prevent the gear from moving between the members. The disadvantages are that the accuracy of the check mechanism decreases due to backlash, the space occupied by the check mechanism increases, and productivity decreases and costs tend to increase due to an increase in the number of processing and assembly processes.

By devising the operation structure of the shift shaft of the transmission case, this invention prevents the traveling gear shift lever from hitting trees when working in orchards. It is an object of the present invention to provide a device that is compact and has a small number of parts and can perform highly accurate reverse tillage check by effectively utilizing the arrangement.

[Means to solve the problem]

The present invention provides a plurality of front and rear shift shafts for traveling gear changes, including forward and backward switching of the aircraft, that protrude laterally from the transmission case, and also provides a rotary tiller with a shift shaft that controls the operation and stopping of the rotary tiller. In a walk-behind cultivator installed in a state that protrudes laterally from the case, the shift shaft for traveling speed change is selected by pushing and pulling in the front and rear direction, and the selected shift shaft is rotated around the lever axis. A gear shift lever is provided which is operated by a shift lever, and the gear shift lever is disposed along the transmission case and the rotary case, and is positioned above the shift shaft of the rotary case, A check arm is provided protrudingly on the shift lever portion near the shift shaft, and a check member for the check arm is provided on the shift shaft of the rotary case, and the check arm and the check member include:
Protrusions and holes are provided that engage with each other when the rotary is moving forward and when the rotary is moving backward when the rotary is stopped, and when the protrusions and holes are in a non-engaged state, the check arm and check member are in contact with each other. It is unique in that it is configured to check and prevent the appearance of the rotary operating state when reversing.

[Effect]

Since the traveling speed change including forward and backward switching of the aircraft body is configured to be operable by a shift lever by pushing and pulling in the longitudinal direction and rotating, the lever does not protrude significantly in the lateral direction of the aircraft body during the gear change operation state. Since the lever is installed along the transmission case and on the shift shaft of the rotary case, the check arm of the gear shift lever can handle both forward and backward movement and swinging around the gear lever axis. The original movement is performed, whereas the restraining member performs only linear reciprocating motion, and the movement of the restraining mechanism is small, close to the minimum necessary limit. Furthermore, since no link members are used, there is naturally no play between the members.

[Effect of idea]

Therefore, it is possible to prevent the traveling gear shift lever from hitting trees or branches when working in the orchard.
Also, there are very few parts that make up the check mechanism.
Easy to process and assemble, easy to produce at low cost,
In addition, since no link members are used, it is easy to perform highly accurate traction operation, and by utilizing the minimum necessary movement of the gear shift lever and rotary side shift shaft, it is compact and occupies a small space for traction operation. I was able to compose it into something.

〔Example〕

1 is an engine, 2 is a belt transmission, 3 is a transmission case, 4 is a control handle whose height can be changed, and 5 is a rotary tilling device attached to the rear of the fuselage.

The height position of the control handle 4 is changed by engaging a pin with a hole, and three holes are provided above and below near the base of the control handle 4, which rotates around the horizontal horizontal axis X. A member 6 having 6a...
On the other hand, a lock pin 8 which is selectively inserted into the hole 6a of the member 6 is engaged by a spring 9 to a handle attachment frame 7 fixed to the upper part of the transmission case via a bolt. It is provided in a state where it is biased in the direction.

The lock pin 8 is inserted and removed by a cam-equipped lever 11 that rotates relative to the lock pin accommodating member 10 around the lock pin axis.
On the end face of the lock pin housing member 10, the lock pin 8 is inserted into the hole 6 by rotating the lever 11 with a cam.
A small cam groove 10a is provided for engaging the cam projection, which fixes the position of the cam projection 11a and prevents the cam lever 11 from rotating when the lever is pulled out from the position a.

Two shift shafts 3a and 3b for forward and backward movement of the aircraft and for switching between high and low speeds are provided protruding from the side surface of the mission case 3, and the shift shaft 3a on the rear side of the aircraft is pulled out from the mission case 3. When the shift shaft 3b on the front side of the aircraft is pushed into the transmission case 3, forward speed 2 appears. It is configured to be

The rotary case 12 is provided with a shift shaft 12a for switching between high and low speeds that protrudes from the side surface of the rotary case, and when pulled out from the rotary case, the rotation speed is low, and when pushed into the rotary case, the rotation speed is high. It is configured to be

Shift shafts 3a and 3b of the transmission case 3
is carried out by operating a gear shift lever 13 disposed along the transmission case 3 and rotary case 12 and above the shift shaft 12a of the rotary case 12. It is operated by pushing and pulling the speed change lever 13 in the longitudinal direction and rotating it around the lever axis.

Further, the shift shaft 12a of the rotary case is operated by a speed change lever 14 which is swingable from side to side.

Then, the shift shaft 1 of the rotary case 12
A restraining arm 15 made of a strip plate material is provided in a portion of the shift lever 13 near 2a to protrude laterally outward, and its tip is bent upward to form a protrusion 16.
is formed. On the other hand, a check member 17 formed by bending a plate material into an inverted L shape when viewed from the side is fixed to the end of the shift shaft 12a of the rotary case 12 so that its upper side overlaps above the check arm 15. Further, on the upper side of this restraining member 17, the shift shaft 12a of the rotary case 12 is in the neutral position, and the restraining arm 15 is disposed only when the shift lever 13 of the aircraft body is rotated to switch to reverse R.
A hole 18 into which the protrusion 16 engages is bored.

Next, the operation of the above embodiment will be explained. When the shift lever 13 is pulled rearward and rotated from the neutral position N to the left to switch to the first forward speed F1, the check arm 15 rotates downward, and this state In this case, the restraining member 17 can freely move left and right, and the rotary shift lever 14 can be operated to the low speed L and high speed H. Then, when the traveling gear shift lever 13 is rotated from the neutral position N to the right side and switched to the reverse R side, the restraining arm 15 is rotated upward, and at this time, the rotary gear shift lever 14 is stopped at the neutral position. When in position N, the protrusion 1 of the check arm 15
6 engages with the hole 18 of the restraining member 17 to enable a gear change operation to reverse R. Further, even if an attempt is made to operate the rotary shift lever 14 from this state, the operation cannot be performed.

Also, change the traveling speed change lever 13 to forward 1st speed F1 or forward 2nd speed F2, and operate the rotary speed change lever 14 to low speed L or high speed H to perform forward plowing, then change the traveling speed change lever 14 to reverse speed R. Even if an attempt is made to operate it to the side, the projection 16 of the restraining arm 15 collides with the lower surface of the restraining member 17 at the side of the hole 18 of the restraining member 17, making it impossible to switch to reverse R.

[Another example]

As shown in FIG. 5, a hole 18 may be formed in the check arm 15 of the traveling shift lever 13, and a protrusion 16 corresponding to the hole 18 may be formed in the check member 17 provided on the rotary shift shift shaft 12a. good.

In addition, even if there are three or more shift shafts for traveling speed change, it can be operated in the same way, and the reverse position is 2.
It can also be applied to items with more than one location.

[Brief explanation of the drawing]

The drawings show an embodiment of the backward tilling control device for a walk-behind cultivator according to the present invention, in which FIG. 1 is a plan view showing the main parts, FIG. 2 is a plan view of the same, and FIG.
4 is a side view showing the entire tiller, and FIG. 5 is a partially cutaway front view of main parts showing another embodiment. 3... Mission case, 3a, 3b... Shift shaft, 5... Rotary tilling device, 12... Rotary case, 12a... Shift shaft, 13... Speed change lever, 15... Check arm, 16... Thrust Part, 17
...Restraint member, 18...hole.

Claims (1)

[Scope of utility model registration request] A plurality of front and rear shift shafts 3a, 3b for traveling speed change including forward/backward switching of the aircraft body are provided in a state of protruding laterally from the transmission case 3, and a shift shaft 1 controls the operation and stopping of the rotary tiller 5.
In the walk-behind cultivator, the shift shaft 3 for the traveling speed change is moved by pushing and pulling in the front and rear direction.
a, 3b, and select shift axis 3a or 3.
A shift lever 13 is provided, which is operated by rotating b around the lever axis, and this shift lever 1
3 to the transmission case 3 and rotary case 1.
2, and the rotary case 1
The shift shaft 12a of the rotary case 12 is disposed above the shift shaft 12a of the rotary case 12.
A restraining arm 15 is provided in a protruding manner at a portion of the speed change lever 13 near 2a, and the rotary case 1
A restraining member 17 for the restraining arm 15 is provided on the shift shaft 12a of No. 2, and the restraining arm 15 and the restraining member 17 have protrusions 16 that engage with each other when the rotary is in the forward operating state and when the rotary is in the reverse state when the rotary is stopped. A hole 18 is provided, and the protrusion 16 and hole 1
8 is in a disengaged state, and the restraining arm 15 and the restraining member 17 are in contact with each other, thereby restraining and preventing the emergence of a rotary operating state during backward traveling. Device.