JPS6013735Y2 - Axle case for walk-behind tiller - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a walk-behind casting machine that can change the longitudinal center of gravity of the machine body, and more particularly to a swingable axle case thereof.

Generally, walk-behind casting machines are designed to prevent the rotary from jumping up during operation, making it difficult to perform tillage operations.
The center of gravity is set at the rear of the aircraft.

For this reason, when turning the tiller, the operator must support an extremely large amount of weight in order to lift the rear part of the machine using the handle and pull the rotary out of the field. This made the work difficult.

Therefore, the axle case is provided so as to be able to swing freely relative to the mission case, and the axle case is fixed at both ends of the swing with stoppers and locking devices, so that the center of gravity is located at the rear of the machine during normal plowing operations. A walk-behind casting machine has been proposed in which the center of gravity is moved forward when turning.

By the way, in the device for changing the longitudinal center of gravity position of the tiller, when the axle case is moved to the swinging end, a large impact load acts on the stopper contact portion of the axle case, so there is a risk that the axle case may be damaged. .

Due to the above-mentioned circumstances, the present invention connects the left and right axle cases to each other at the mating flange portion at the tip of the protruding connecting portion provided on the cases, and configures the stopper to collide with the mating flange portion. Without being deformed by impact force,
The object of the present invention is to provide an axle case for a walk-behind casting machine that is lightweight and sturdy, and the load is divided equally between the left and right axle cases.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the walk-behind casting machine 1 has a body 3 suspended by left and right drive wheels 2, 2.

An engine 5 is mounted on the front part of the fuselage 3, and a transmission 7 to which power is transmitted from the engine 5 via a belt transmission 6 is disposed in the middle, and a handle 9 extends behind it. A rotary 10 is mounted and fixed below the paddle 9 at the rear of the fuselage 3.

As shown in FIG. 3, the transmission 7 is covered with a transmission case 11, and a side clutch shaft 13 to which a drive gear 12 is fixed is rotatably supported by the case 11.

The clutch shaft 13 has gears 12 on both sides of the drive gear 12.
and the side clutch lever
14 (Fig. 1), left and right side clutch gears 15, 15, which can release the engagement, are rotatably supported.
The gears 15.15 are splined to the left and right intermediate shafts 16.16, respectively, and are constantly meshed with intermediate gears 18.18, which are positioned by collars 17.

The intermediate shaft 16 protrudes and extends to the left and right of the transmission case 11, and gears 19 and 19 are spline-coupled to each of the protruding portions, and the axle cases 20 and 20 are pivotable about the intermediate shaft 16. is supported by the transmission case 11 with its protruding cylindrical portions 20 a, 20 a being pivotally supported by bearings 21 .

Further, left and right axles 22.22 are rotatably supported by the case 20.20, and an axle gear 23.23 meshing with the gear 19.19 is spline-coupled to the axle 22.22. There is.

Further, the axle cases 20 and 20 have lid portions 20b and 2, respectively.
It works together with 0b to cover each gear 19.23, and
Protruding connecting portion 20c below the mission case 11
, 20c are extended, and both protruding connecting portions 20
C? 20c are connected to each other at the mating flange portions 20d, 20d at their tips on the central plane of the transmission case 11, so that the left and right axle cases 20.20 swing together.

Furthermore, a protrusion 2 formed on the upper part of the axle case 20.20
There is a balance spring 24 between 0e, 20e and the fuselage.
24 is tensioned, and the spring 24 biases in the opposite direction with a rotational force slightly smaller than the rotational force of the axle case 20 based on the weight of the machine to balance the weight of the machine.

Furthermore, as shown in FIGS. 4 and 5, an axle case 20
．． Lock shafts 25 and 26 are fixed to the front and rear sides of each case 20 so as to connect both cases 20 and 20.

On the other hand, as shown in FIG. 6, the axle case 20 of the fuselage 3,
Lock arms 27.29 are pivotally supported at the front and rear of each arm 27.20 by fulcrum pins 30.31, respectively.
29 are biased by springs 32 and 33 so as to abut against the lock shafts 25 and 26 of the case 20, respectively.

Further, the tip of each lock arm 27.29 can be engaged with the lock shaft 25.26, and the other end can be engaged with a lock pin 37.39 provided at the tip of one of the bell crank-shaped links 35.36. , can prevent rotation of the lock arm.

Further, the other bell crank-shaped links 40 and 41 are connected to a swing operating lever 45 provided on the handle 9 via Bowden wires 42 and 43, respectively, and
Return springs 46, 47 are tensioned.

Furthermore, stoppers 49 and 50 are provided at the front and rear of the lower part of the transmission case 11, and are made of bolts that are screwed together so that the amount of protrusion can be freely adjusted.
is the mating flange portion 20 of both axle cases 20.20.
d to restrict the swinging position of the axle case 20.

Since the present invention has the above-described configuration, during normal tilling work, the rotation of the engine 5 is transmitted to the transmission 7 via the belt transmission device 6, and is further transmitted to the drive gear 12 of the transmission 7 and the left and right side clutch gears 15. , 15 and the intermediate gear 18 to the intermediate shaft 16, and further to the gear 1
9.23 to the axle 22.22, driving the axle 2 to drive the tiller 1, and at the same time drive the rotary 10.
Power is also transmitted to the farm to perform tillage work.

At this time, in the axle case 20, as shown by the solid line in FIG. 2 and FIG. The axle case 20 is engaged with the transmission case 11 because the other end of the arm 29 is in contact with the lock pin 39 and is prevented from rotating.
Although the intermediate shaft 16 forming a pivot point between the axle and the axle is located a short distance 1 forward of the vertical line of the axle 22, the center of gravity G is
is fixed in a rising position acting slightly rearward of the axis of the

Next, when turning the tiller 1 on the headland, when the swing operation lever 45 is rotated upward, the bowden wire 4
2 is loosened, and the Bowden wire 43 is pulled against the return spring 47, and the front lock pin 37 is urged to rotate so as to come into contact with the end of the button arm 27, and the rear lock pin 39 is locked. It is rotated so as to be removed from the arm 29.

As a result, the vertical line of the axle 22 is located slightly rearward of the intermediate shaft 16, which is the center of swing of the axle case 20, so that the axle case 20 is aligned with the intermediate shaft 16, as shown by the chain line in FIG. Based on the acting gravity, the body 3 is rotated against the spring 24 and moves forward with respect to the axle 22.

Then, at the same time that the mating flange portion 20d of the axle case 20 collides with the rear stopper 50, the tip of the lock arm 27 engages with the lock shaft 25, and the axle case 20 is fixed in the inclined position.

In this state, the intermediate shaft 26 has a large L with respect to the perpendicular to the axle 22.
Since it is moving forward, the center of gravity G also acts in front of the axle 2, and the driver can easily pull up the rotary 10 by lifting the auxiliary handle together with the operating lever 45.

Furthermore, when the rotation of the tiller 1 is completed and in order to start tilling work again, the swing operation lever 45 is rotated downward and the lever 45 is held to prevent the machine body 3 from moving forward.

Then, the locking action of the lock arm 27 by the lock pin 37 is released, and the axle case 20 can swing forward, so that the axle case 20 moves along the solid line in FIG. It is swung to the rising position shown in the figure.

Then, by the return spring 47, the rear lock arm 2
The lock bin 39 is biased so as to be in contact with the upper end of 9.
The tip of the lock arm 29, which is urged by the spring 33 to contact the lock shaft 26, engages the shaft 26 and at the same time engages the other end of the lock arm 29, causing the arm 2
Prevent rotation of 9.

At this time, the mating flange portion 20d collides with the front stopper 49, and therefore the axle case 20 is moved against the stopper 49.
and is clamped by the lock arm 29 and securely fixed.

As described above, according to the present invention, the left and right axle cases 20.20 have their protruding connecting portions 20c.

20c are connected to each other at the mating flange parts 20d, 20d, and a stopper 49 is attached to the mating flange part 20d.
．． 50 collide with each other, the impact force acts on the thick part of the flange joint, and the impact force acts on the thick part of the flange joint 2.
0d is not deformed by the collision, and the load from the stopper 49°50 is transferred to the left and right axle cases 20.
．． Even if the axle case 20 is small and lightweight, it can sufficiently carry the load.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a walk-behind tiller to which the present invention is applied, Fig. 2 is a schematic side view showing the swinging state of the axle case, and Fig. 3 is a cross section taken along the line - ■ in Fig. 1. 4 is a sectional view taken along line IV--IV in FIG. 1, FIG. 5 is a perspective view of the axle case, and FIG. 6 is a side view showing the axle case. 1... Walking type tiller, 3... Machine body,
11...Mission case, 20...
Axle 'y--su, 20 e...Protruding connection part, 2
0d...Mating flange part, 27-45...
・Rock outfit! , 49,50-----Stots tX knee.

Claims (1)

[Scope of utility model registration request] The axle case is swingable relative to the mission case,
In a walk-behind casting machine in which the longitudinal center of gravity position of the machine body can be changed by fixing the axle case at both ends of its swing with a stopper and a locking device, the left and right axle cases are connected to a protruding connection part provided on the case. an axle case for a walk-behind casting machine, the axle cases being connected to each other at mating flange portions at the tips thereof, and configured such that the stopper collides with the mating flange portion;