JPH0513628Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a speed change operation device for a mobile agricultural machine that performs work by turning the handle rod in the front and rear directions depending on the work conditions, type of work, etc.

Conventional technology Conventionally, in two-wheeled walking-type mobile agricultural machines,
Depending on the work conditions and type of work, some work is performed by turning the handlebar and the gear shift lever in the front-rear direction of the vehicle body. Furthermore, a plate-shaped change guide having a guide groove is attached to the mobile agricultural machine, and a guide pin that moves in response to a speed change operation of a speed change lever is located within the guide groove.

Here, as the handlebar and the gear shift lever are turned in the longitudinal direction of the vehicle body, the operator also changes his position in the longitudinal direction of the vehicle body and operates the handlebar and the like. Therefore, when the handlebar is turned to the rear of the vehicle body and when it is turned to the front of the vehicle body, the moving direction of the mobile agricultural machine when the gear shift lever is operated to the same position is forward or backward from the operator's perspective. It will be in the opposite direction.

Therefore, from the perspective of preventing erroneous operation of the gear shift lever, we designed a first shift position indicator mark that indicates the gear shift position of the gear shift lever when the handlebar is turned toward the rear of the vehicle in the normal state, and A second shift position indicating mark indicating the shift position of the shift lever when turned forward is provided on the edge of the guide groove in the change guide. Furthermore, a high-speed back control mechanism is provided to limit high-speed back movement of the mobile agricultural machine when the handlebar is turned toward the front of the vehicle body.

Problems to be Solved by the Invention The first shift position indicator mark and the second shift position indicator mark are arranged close to each other, and
It is laid out flat. Furthermore, an indication of how to operate the high-speed backlash restriction mechanism is provided adjacent to the shift position indication mark. Therefore, when the handlebar is turned in either direction of the vehicle body, these two sets of shift position indication marks are visible to the operator, and if the operator is unfamiliar with the operation or In such cases, there is a risk of misreading the shift position indicator mark and operating the shift lever incorrectly, resulting in a serious accident.

Further, the high-speed backlash regulation mechanism has a complicated structure and requires time and effort to operate.

Means for Solving the Problems A mobile agricultural machine that can freely turn with its handle rod in the front-rear direction of the vehicle body is provided with a guide pin that moves with the speed change operation of a speed change lever and a guide groove in which the guide pin moves. A first protrusion is fixed to the edge of the guide groove, and a second protrusion is attached to the edge of the guide groove to be rotated in the front-rear direction as the handle rod is turned in the front-rear direction. The first protrusion is formed with a rearward-facing inclined surface facing the rear of the vehicle body and having a low-speed side gear shift position indication mark, and a forward-facing inclined surface facing the front of the vehicle body and having a low-speed side gear change position indication mark. When the handlebar is rotated toward the rear of the vehicle, it faces toward the rear of the vehicle, and a rearward-facing inclined surface with a mark indicating the high-speed gear position is attached. When rotated, the second protrusion is formed with a forward-facing inclined surface that faces the front of the vehicle body and has a high-speed back restriction display attached thereto. Furthermore, the second protrusion is provided with a restriction portion that comes into contact with the guide pin when the handlebar is rotated in response to a turn operation toward the front of the vehicle body, thereby restricting the speed change operation of the speed change lever to the high speed back position.

Function When the handlebar is turned toward the rear of the vehicle body, from the operator's position, the user can see the low-speed gear position indication mark attached to the rearward-facing inclined surface of the first protrusion and the rear side of the second protrusion. The high-speed side shift position indication marks attached to the inclined surface are visible, and the operator performs a gear change operation of the shift lever while looking at these shift position indication marks. When the steering wheel is turned toward the front of the vehicle, from the driver's position, the driver can see the low-speed gear position indication mark attached to the forward-facing inclined surface of the first protrusion and the forward-facing inclined surface of the second protrusion. The operator can see the display indicating the high-speed back-up regulation attached to the machine, and the operator operates the gear shift lever while looking at these shift position indication marks and displays. Furthermore, when the handlebar is turned toward the front of the vehicle, if you try to shift the shift lever to the high-speed reverse position, the guide pin will come into contact with the restriction part of the second protrusion, preventing the shift operation to the high-speed reverse position. is regulated.

Embodiment An embodiment of the present invention will be described based on the drawings.
First, a handle rod 3 is attached to the upper part of a transmission case 2 of a mobile agricultural machine 1 having a two-wheeled body.
The handle rod 3 is provided so as to be turnable in the longitudinal direction of the vehicle body of the mobile agricultural machine 1. Further, a speed change lever 4 is attached to the mobile agricultural machine 1 in parallel with the handle rod 3, and this speed change lever 4 is also provided so as to be freely turnable in the longitudinal direction of the vehicle body of the mobile agricultural machine 1. The transmission case 2 includes a plurality of shift gears (not shown) whose meshing states change as the shift lever 4 is operated, and shafts 5 and 6 to which these shift gears are fitted and fixed. A transmission mechanism is housed therein, and joints 7 and 8 are fixed to the tips of the shafts 5 and 6 that protrude outside of the transmission case 2.

Next, the speed change lever 4 includes a first support cylinder part 10 that is rotatable in the front and rear directions around the axis of the support shaft 9;
A second support cylinder part 11 is fitted into the support cylinder part 10 so as to be rotatable around the axis;
It consists of an operating part 12 which is slidable in the vertical direction and rotatably engaged integrally with the support cylinder part 11,
An arm 13 and a guide pin 14 are fixed to the second support cylinder part 11. And the arm 1
The tip portions of the guide pins 14 are selectively engaged with the grooves of the joints 7 and 8, and the tip portions of the guide pins 14 are located in guide grooves to be described later.

A plate-shaped change guide 15 is fixed to the transmission case 2 at a position covering above the joints 7 and 8 and the arm 13, and an H-shaped guide groove 16 is formed in the change guide 15. . Further, a first protrusion 17 is fixed to the upper surface of the change guide 15 so as to be located at the edge of the guide groove 16 . This first protrusion 1
7 is formed with a rearward inclined surface 18 facing toward the rear of the vehicle body of the mobile agricultural machine 1 and a forward facing inclined surface 19 facing toward the front of the vehicle body.
is the low speed gear position indication mark (1-N-R ₁ )
is printed on the forward-facing inclined surface 19, and a low-speed side shift position indication mark (1-N-R ₁ ) is similarly printed on the forward-facing inclined surface 19.

Next, a second protrusion 20 is attached to the upper surface of the change guide 15 by a pin 21 so as to be rotatable in the front and rear directions. This second protrusion 20
When the handlebar 3 and the gear shift lever 4 are turned toward the rear of the vehicle, they are rotated forward (in the direction of arrow a) as shown in FIGS. 1 and 2, and the handlebar 3 is When the shift lever 4 is turned toward the front of the vehicle body, it is rotated backward (in the direction of arrow b) as shown in FIGS. 3 and 4.
Here, the second protrusion 20 has a rearward inclined surface 22 that faces toward the rear of the vehicle body when it rotates forward, and a forwardly facing inclined surface 23 that faces forward when it rotates backward.
A high-speed side shift position indication mark (2-N-3) is printed on the rearward-facing inclined surface 22, and a "high-speed back regulation" indication is printed on the forward-facing inclined surface 23. printed. Further, the second protrusion 20 is formed with a restriction portion 24 that covers a portion of the guide groove 16 on the high speed change side when the second protrusion 20 is rotated rearward.

In such a configuration, in a normal state in which the handle rod 3 and the gear shift lever 4 are turned toward the rear of the vehicle body of the mobile agricultural machine 1, the second protrusion 20 is turned as shown in FIGS. 1 and 2. Rotate it toward the front of the vehicle. Then, the operator asks for the shift position indication mark (1-N-R ₁ ) printed on the rearward-facing inclined surface 18 of the first projection 17 and the rearward-facing inclined surface 22 of the second projection 20. Only the gear shift position indicator mark (2-N-3) can be seen, and the gear shift position indicator mark used when the handlebar rod 3 is turned toward the front of the vehicle body becomes invisible. Therefore, erroneous operation of the shift lever 4 due to misreading the shift position indication mark is prevented.

Next, when the handle rod 3 and the gear shift lever 4 are turned toward the front of the vehicle body of the mobile agricultural machine 1, the second protrusion 20 is rotated toward the rear of the vehicle body as shown in FIGS. 3 and 4. I'll keep it. Then, the operator sees the gear shift position indication mark (1-N) printed on the forward-facing inclined surface 19 of the first projection 17.
-R ₁ ) and the "High-speed Back Regulation" printed on the forward-facing inclined surface 23 of the second protrusion 20 are visible. The position indicator mark becomes invisible. Therefore, erroneous operation of the shift lever 4 due to misreading the shift position indication mark is prevented. Further, since the restricting portion 24 of the second protrusion 20 covers the portion of the guide groove 16 at the high-speed side gear shift position, the guide pin 14 will hit the restricting portion 24 even if an attempt is made to shift the shift lever 4 to the high-speed back position. The shift operation to the high-speed reverse position is restricted. Therefore, high-speed backlash of the mobile agricultural machine 1 due to erroneous operation of the speed change lever 4 is reliably prevented, and work safety is greatly improved. Moreover,
The extremely simple structure and operation of rotating the second protrusion 20 toward the front of the vehicle body allows the speed change operation to the high-speed reverse position to be restricted.

In addition, to explain the turning operation of the gear shift lever 4 in the front-rear direction, only the operating part 12 is pulled upward by a predetermined distance, and the operating part 12 and the second support cylinder part 1 are removed.
After releasing the engagement state with 1, press only the operation part 12.
The device is turned 180°, and after the turn is completed, the operating portion 12 and the second support cylinder portion 11 are engaged again.

Effects of the invention Since the invention is configured as described above, when the handle rod is turned toward the rear of the vehicle body of the mobile agricultural machine, the operator can see the low-speed side attached to the rearward-facing inclined surface of the first protrusion. Only the gear shift position indication mark and the high-speed gear shift position indication mark attached to the rearward-facing inclined surface of the second protrusion are visible. The person can only see the low-speed gear position indication mark attached to the forward-facing inclined surface of the first protrusion and the high-speed reverse restriction indication attached to the forward-facing inclined surface of the second protrusion. When the handlebar is turned in any direction in the longitudinal direction of the vehicle body, only the gear shift position indication mark necessary for the working condition at that time can be seen. In addition, when the handlebar is turned toward the front of the vehicle body, the restriction part moves to the position where it contacts the guide pin, preventing high-speed backlash of the gearshift lever. By regulating the speed change operation to the position, it is possible to prevent accidents caused by backing up of the mobile agricultural machine at high speed, thereby further increasing work safety.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view showing the transmission case section with the handlebar rod and gear shift lever turned toward the rear of the vehicle; FIG. 2 is a plan view thereof; Figure 3 is a side view showing the transmission case with the handle rod and gear shift lever turned toward the front of the vehicle body, Figure 4 is its plan view, Figure 5 is a side view showing the entire mobile agricultural machine, and Figure 6 is The figure is a plan view showing the entire mobile agricultural machine. DESCRIPTION OF SYMBOLS 1... Mobile agricultural machine, 3... Handle stick, 4... Speed change lever, 14... Guide pin, 16... Guide groove, 17... First protrusion, 18... Rearward inclined surface, 19... Forward facing inclined surface, 20...Second protrusion, 22...Backwards inclined surface, 23...Forward inclined surface, 24...Restricting portion.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine that can freely turn the handle rod in the longitudinal direction of the vehicle body, a guide pin that moves in response to a speed change operation of a speed change lever and a guide groove in which this guide pin moves are provided, and a first groove is provided at the edge of the guide groove. A second protrusion is attached to the edge of the guide groove, which fixes the protrusion and rotates the handlebar in the longitudinal direction when the handlebar is turned in the longitudinal direction. A rearward-facing inclined surface with a position indicating mark and a forward-facing inclined surface facing the front of the vehicle body and having a low-speed gear position indicating mark are formed on the first protrusion, When the steering wheel is turned to the front of the vehicle, the steering wheel faces the rear of the vehicle, and a rearward-facing inclined surface with a mark indicating the high-speed gear position is attached. The second protrusion is formed with a forward-facing inclined surface on which a high-speed back restriction indication is attached, and the handlebar is brought into contact with the guide pin by rotation when the handlebar is turned toward the front of the vehicle body. A speed change operation device for a mobile agricultural machine, characterized in that the second protrusion is provided with a restriction portion that restricts a speed change operation of the speed change lever to a high speed back position.