JPS5854259Y2 - Tractor operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tractor that is equipped with a lift arm that is moved up and down by a lift operation lever, and that lifts and lowers a rotary work machine installed at the rear of the machine body using the lift arm.

Conventionally, when a rotary work machine is being driven, a technology (for example, Japanese Patent Laid-Open No. 51-27503).

However, in the above-mentioned conventional technology, since the power intermittent of the rotary work machine and the backward movement restriction are performed in a correlated manner, for example, the rotary work machine in the stopped state can go backward even when it is on the ground, so that the backward movement of the rotary work machine is possible. There is a considerable risk of the rotary work machine colliding with a ridge or the rotary claw getting caught on the ground, etc. Especially in riding-type tractors, it is difficult to see the rear underside of the rotary work machine from the driver's seat. It is difficult to safely perform reverse operation simply by stopping the rotary work machine.

The present invention eliminates the drawbacks of the conventional technology, and includes a cam lever that restricts the backward movement of the reverse operation lever that performs reverse gear change, and a lock plate that fixes the cam lever connected to the lever. The lock plate is connected to the lever so as to be switchable and displaceable in conjunction with the upward movement of the arm, and the backward movement of the reverse operation lever is restricted via the cam lever in the downward operation state of the lift operation lever, while the backward operation When the lever is in the reverse operation state, the lowering operation of the lift operation lever is regulated via the lock plate, and the lock plate and the lower operation of the lift operation lever are controlled based on the operation of each lever. The levers can be mutually controlled through the cam lever, and the rotary working machine can be lifted and supported more safely than before, and the lock plate and cam lever can be used to control each of the levers, resulting in an extremely simple structure. To provide an operating device for a tractor, which can fixedly support each lever in relation to each other, and in particular can properly perform reverse movement at the edge of a ridge and lowering of a rotary working machine, and can safely change direction at the edge of a ridge. This is what I am trying to do.

An embodiment of the present invention will be described below in detail with reference to the drawings.

Fig. 1 is a schematic side view of an agricultural tractor, in which 1 is the engine, 2 is the flange case, 3 is the minsion case,
4 is a front wheel, 5 is a rear wheel, 6 is a rear axle, 7 is a steering wheel, 8 is a driver's seat, 9 is a main gear shift lever which is a reverse operation lever, 10
11 is a PTO gear shift lever, 11 is a PTO shaft, 12 is a link on which various working machines are installed, 13 is a lift arm, and 14 is a hydraulic device that is a lifting device thereof, and the engine 1 and each case 2.3 are integrated. and the link 12...
- A rotary work machine 15 is installed in the rotary work machine 15, and a rotary 17 is connected to the PTO shaft and one shaft and one hole through the transmission shaft 16.

As shown in FIGS. 2 and 3, a shift fork 17 to be engaged with the lower end of the main shift lever 9 is fixed to a shift shaft 18, and the shaft 18 is slidably assembled into the minsion case 3 by the lever 9. , the shift fork 1 is attached to a forward/reverse switching gear 21 which is engaged and supported on the drive shaft 19 and meshes with the reverse gear 20 as appropriate.
7, and by operating the lever 9, the gear 21 is slid together with the shift fork 17 and the shift shaft 18, and the gear 21 is engaged with the reverse gear 20, so that the drive shaft 19 is reversely rotated to the rear axle 6. It is formed so as to be connected.

Further, the hydraulic device 14 has a built-in hydraulic cylinder (not shown), and includes a hydraulic switching valve 22 and a lift operation lever 23.
, the lift arm 13 and the rotation shaft 24, and the lift arm 13 is configured to move up and down by operating the hydraulic cylinder via the switching valve 22 by operating the lever 23.

A continuous culm 26 is fixed on the same shaft 25 as the lever 23, and a pin 28 of a lock plate 27 provided to be able to slide back and forth is inserted into a long hole 29 of the continuous culm 26.

A Ronfirm 30 which is brought into proper contact with the lock plate 27 to restrict rotation is rotatably supported on a pivot 31, and
A hook 33 is formed on the arm 30 to engage with the stepped portion 32 of the lock plate 27.

Link 35 to the Ron farm 30 via Rondo 34
A cam lever 37 is connected on the same axis as the link 35.
A protrusion 38 is provided on the shift shaft 1B to fix the lever 37 and to come into contact with the lever 37, so that the shift lever 9 and the elevation operation lever 23 are connected to each other so as to restrict their operation in a correlated manner.

Next, a PTO output output flange 39 is interlocked and connected to the PTO shaft 1 shaft hole 1 live shaft 19, and a clutch lever 40 for turning on and off the clutch 33 is connected to the middle of the lift arm 13 via a rond 41, and the lift The clutch 39 is turned off by the upward movement of the arm 13, and P
It is formed so that one TO shaft hole is fixed therein.

The present invention is constructed as described above, and as shown in FIG.
3 to the lowered position and the lift arm 13 is lowered, the lock plate 27 comes into contact with the Ron firm 30, restricts the rotation of the arm 300, and connects the link 35 and coaxial 36 via the Ron 34. A cam lever 37 provided above is fixed together with the arm 30, and the lever 3
7 and the protrusion 38, the sliding movement of the shift shaft 18 is restricted, and the meshing operation of the reverse gear 20 and the switching gear 21 by the speed change lever 9 is prevented.

While the lift arm 13 is being lowered in this way, the PTO output clutch 39 is turned on via the clutch lever 40 and the iron 41, and at this time, the drive shaft 19
By transmitting one PTO shaft, one shaft hole, and one engine output through the rotary rotary 17, plowing work can be performed.

Then, as shown in FIG. 3, move the lift operation lever 23 to the raised position, move the lift arm 13 upward, and lift the rotary work machine 15 via each link 12...
The upward movement of the arm 13 turns off the PTO output clutch 39 via the crank lever 40 and the rond 41, stopping the rotary 17 in the PTO shaft 1 shaft hole 1, and in conjunction with the movement of the lever 23, the lock plate 39 is turned off. 27 slides to the left to release the locking operation of the Ronfirm 30 by the iron plate 27.

When the rotary work machine 15 is lifted in this way, the main shift lever 9 is tilted backward, the shift fork 17 and the shift shaft 18 are slid forward, the shift gear 21 is engaged with the reverse gear 20, and a reverse operation can be performed. At the same time, as the shaft 18 slides, the protrusion 38 comes into contact with the cam lever 37, and the lever 37 is pushed down, and the ron firm 30 is rotated counterclockwise via the ron 34 and the link 35, and the hook of the arm 30 is rotated. 33 is kept engaged with the stepped portion 32 of the lock plate 27 to prevent the lift operation lever 23 from moving to the lower position. By moving the shift lever 9 to the neutral or forward position, the return spring 42 This disengages the engagement between the lock plate 27 and the Ronfirm 30, and allows the rotary working machine 15 to be lowered by the lifting operation lever 23.

Therefore, by lifting the rotary work machine 15, P
Since the TO output output flange 39 is dynamically turned off and stops the rotary 17, it is possible to perform turning motion safely, eliminate inconveniences such as the soil being scattered by the rotary 17 during plowing and puddling, and make the rotary 17 drive more efficient. By making the length of the iron 41 adjustable, the stopping position of the PTO shaft 11 can be easily set.

Next, the gear shift lever 9 can be used to perform reverse operation only when the rotary work machine 15 is being lifted up, allowing the tractor to move backwards, and when the tractor is moving backwards, the lifting operation lever 23 is fixed and the work machine 15 is grounded. This prevents damage to the rotary 17, etc., and enables safe tilling work.

Furthermore, FIG. 4 shows a modification of the above embodiment, in which a continuous culm 26a fixed to a rotating shaft 24 that pivotally supports the lift arm 13, a lock plate 27a provided so as to be able to slide back and forth, and a continuous culm A long hole 29a formed at the tip of 26a and a lock plate 2
A bottle 28 provided in 7a and fitted into the elongated hole 29a thereof.
a, and the pivot 31a which is brought into proper contact with the lock plate 27a.
A Ronfirm 30a that restricts rotation around the lock plate 27a, a stepped portion 32a formed on the lock plate 27a, and the arm 30.
a hook 33 that is formed in the shape of a cylindrical shape and is engaged with the stepped portion 32a, a link 35a that is connected to the rond farm 30a via a rond 34a, a cam lever 37a that is fixed on the same shaft 36a as the link 35a, and the shift shaft 18. a protrusion 38a which is formed in a shape and is brought into contact with the lever 37a as appropriate;
When the rotary work machine 15 is lifted up, the lift arm 13 is moved upward to release the engagement and fixation between the lock plate 27a and the Ronfirm 30a, and when the speed change lever 9 is operated to move backward, the hook 33a is released. The lock plate 27a is engaged with the stepped portion 32a to prevent the lift arm 13 from moving downward, and the lock plate 27a is engaged and fixed to the long firm 30a by the downward movement of the lift arm 13 and the return spring 42a.
Reverse operation by the gear shift lever 9 is prevented.

Also, a crank lever 40a for turning on and off the PTO output clutch 39, a link 43 provided on the same axis 25 as the lifting operation lever 23, and a link 43 between the lever 40a and the link 43.
A rond 41a is provided to connect the PTO output crank 3 when the elevator lever 23 is moved to the lower position.
9, the rotary 17 is operated via the PTO shaft 11 to perform tilling work, and when the lever 23 is moved to the raised position, the PTO output is output via the link 43, the Rondo 41a, and the crank lever 40a. The crank 39 is turned off, the PTO shaft 11 is stopped, and the drive of the rotary 17 is interrupted.

As is clear from the above embodiments, the present invention includes a lift arm 13 that is moved up and down by a lift operation lever 23,
In a tractor that raises and lowers a rotary working machine 15 installed at the rear of the machine body using the lift arm 13, a cam lever 37.37a is provided to restrict the backward movement of a reverse operation lever 9 for changing reverse speed, and this is fixed to the lever 37.37a. At the same time, the lock plates 27, 27a are connected to the lever 23 such that the lock plates 27, 27a can be switched and displaced in conjunction with the upward movement of the lift arm 13 by the lift operation lever 23.
The backward operation of the reverse operation lever 9 is restricted via the cam lever 37.37a in the lowering operation state, while the lock plate 27,
27a, the lowering operation of the elevating operating lever 23 is regulated, and the reverse gear change of the reversing operating lever 9 and the lowering operation of the elevating operating lever 23 are controlled by each lever 9, 23.
Lock plates 27, 27a and cam lever 3 based on the operation
7.37a, the rotary work machine 15 can be lifted and supported more safely than before, and the control of each lever 9.23 can be controlled by the lock plates 27, 27a.
By using both the cam levers 37 and 37a, the levers 9 and 23 can be fixedly supported in a very simple structure, and the rotary work machine 15 can be moved backwards and lowered properly at the edge of the ridge. This has remarkable effects such as being able to safely change direction at the moment.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a tractor showing an embodiment of the present invention, Fig. 2 is an enlarged view of its main parts, Fig. 3 is an explanatory diagram of its operation,
FIG. 4 is an explanatory diagram of main parts showing a modification. 9... Gear shift lever (reverse operation lever), 13.
...Lift arm, 14...Hydraulic system (
Lifting device), 15...Rotary working machine.

Claims (1)

[Scope of utility model registration request] In a tractor that is equipped with a lift arm 13 that is moved up and down by a lift operation lever 23 and that raises and lowers a rotary working machine 15 installed at the rear of the machine body using the lift arm 13, a cam lever 37 that restricts the backward movement of the reverse operation lever 9 that performs reverse gear change. .37a is provided, and the lever 37.37a is provided.
A lock plate 27.27a is connected to the lock plate 27.27a for fixing the lever 27a, and the lever 27a can be switched and displaced in conjunction with the upward movement of the lift arm 13 by the lift operation lever 23.
3 to connect the lock plate 27.27a to the cam lever 37.3, and when the lift operation lever 23 is in the lowering operation state, the cam lever 37.3 is connected to the lock plate 27.27a.
The backward operation of the reverse operation lever 9 is restricted via the reverse operation lever 7a, and the downward operation of the lift operation lever 23 is restricted through the lock plate 27.degree. 27a when the reverse operation lever 9 is in the backward operation state. Tractor operating device 0