JPS5857124B2 - Tiller power disconnection device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a tilling machine that uses the power of a tractor to cultivate a field, in which the power of the tractor is automatically connected/disconnected in relation to the elevation angle of the tillage machine. In a tiller that is related to the improvement of a tractor, the bending angle of the universal joint allows the tiller to be raised above a certain height above the ground when it is required to turn in response to the tillage situation in the field. According to the present invention, the power of the tiller is automatically cut off, and the rotation of the tiller blade built into the tiller is stopped, thereby preventing accidents caused by contact with surrounding workers due to the rotation of the tiller blade. (Refer to Japanese Patent Laid-Open No. 50-44359).

However, in this type, the tractor power is connected by a clutch mechanism that directly engages the driving side connecting pawl and the driven side connecting pawl, so the starting of the tilling blade, which is subject to heavy loads, lacks smoothness. This has had problems such as generating noise during engagement and shortening the durability of the clutch element.

The present invention addresses the above-mentioned problems, allows the tractor power to be connected and disconnected smoothly, prevents noise generation, and significantly increases the durability of the clutch mechanism.

An embodiment of the invention will be described with reference to the drawings.

A tiller with a tractor is constructed by connecting and arranging a tiller 2 behind a tractor 1. In the field, a tiller blade 3 built into the tiller 2 rotates via a clutch mechanism 4 to remove soil. It is something that can be dug up.

Reference numeral 5 denotes a clutch case, and 6 a drive shaft fixedly disposed at the axis of the clutch case 5. The output shaft 1a of the tractor 1 can be inserted and connected to the drive shaft 6 via a pin 7.

Reference numeral 8 denotes a first slide member that is slidably and non-rotatably fitted to an outer spline 6a provided on the drive shaft 6, and the first slide member 8 is biased by a spring 9 compressed to the drive shaft 6. There is.

10 is a second slide member slidably fitted to the first slide member 8; 11 is a flange member connected to the second slide member 10 and fitted to the first slide member 8; Several coil springs are compressed between the two slide members 10, and 13 is a retaining ring that is fixed to the first slide member 8.

Therefore, the second slide member 10 has a coil spring 12.・・・
..., 12, and its engagement surface 10
a is pressed against the engagement surface 8a of the first slide 1 member 8,
Normally, the first slide member 8 and the second slide member 10 are configured to slide integrally.

Reference numeral 14 denotes a spring which is compressed into the clutch case 5 with one end abutted against the flange member 11.

Reference numeral 15 denotes a yoke supported at the tip of the drive shaft 6 via a pole bearing 16, and an inner clutch portion 15a and an outer clutch portion 15b slightly protruding from the inner clutch portion 15a are formed at one end of the yoke 15. The inner clutch portion 15a is attached to the clutch piece 8b formed on the first slide member 8, and the outer clutch portion 1
5b is a clutch piece 1 formed on the second slide member 10
It is located so that it can be connected and disconnected to 0b.

Further, the other end of the yoke 15 is connected to a first universal joint 17.

18 is a spacer for the clutch piece 8b of the first slide member.

In addition, the clutch pieces 8b, 10b and the inner clutch part 1
5a and the outer clutch portion 15b are always connected before the clutch piece 10b and the outer clutch portion 15b are connected. Reference numeral 19 is a sliding tube that is opposed to the flange member 11 via a thrust bearing 20. The inner circumferential surface of the sliding tube 19 is slidably fitted to the outer circumferential surface of the yoke 15, and the outer circumferential surface of the sliding tube 19 is slidably fitted to the inner circumferential surface of the clutch case 5. .

Therefore, when the sliding tube 19 is slid against the spring 14 and the spring 9, the first sliding member 8 and the second sliding member 10 also slide via the flange member 11, and the clutch pieces 8b, 10b The inner clutch portion 15 is separated from the outer clutch portion 15b.

21 is an outer cylinder screwed onto the sliding cylinder 19.

17a is a suppression member attached to the first universal joint 17, 22 is a transmission shaft connected to the first universal joint 17, and 23 is a transmission shaft 22
A second universal joint 23 is connected to the input shaft 2a of the tilling machine 20.

Next, the power connection/disconnection operation of the tractor-equipped tiller will be explained.

When the tilling machine 2 is on the ground, the clutch mechanism 4
is in the state shown in FIG.

That is, the power of the output shaft 1a of the tractor is transmitted to the drive shaft 6,
It is transmitted to the input shaft 2a of the tilling machine via the first slide member 8, the second slide member 10, the yoke 15, the first universal joint 17, the transmission shaft 22, and further the second universal joint 23.

As the tractor 1 starts, the tiller 2 operates and the tiller blade 3 digs up the soil.

When the tilling machine 2 is raised to a certain height...
・For example, when it is necessary to rotate the tilling machine 2・
..., the clutch mechanism 4 is in a state as shown in FIG.

That is, when the tilling machine 2 is raised by the lift device 24 equipped on the tractor 1, the first universal joint 17 is tilted via the transmission shaft 22, and the outer cylinder 21 is pressed by the suppressing member 17a.

When the outer cylinder 21 is pressed, the sliding cylinder 19 is moved by the spring 14.
Since the spring 9 slides while being compressed, power transmission between the first slide member 6, the second slide member 10, and the yoke 15 is interrupted.

Therefore, the power of the output shaft 1a of the tractor is transmitted to the tilling machine 2.
It cannot be conveyed to

When the tilling machine 2, which has been raised to a height of The sliding tube 19 slides in the opposite direction due to the elasticity of the spring 14 and the spring 90.

On the other hand, the first slide member 8 and the second slide member 10 also slide toward the yoke 15 due to the elasticity of the springs 9 and 140.

At this time, the first slide member 8 and the second slide member 10 are rotating at high speed in response to the rotation of the output shaft 1a, but the yoke 15 is stationary, so first the clutch of the second slide member is rotated. The piece 10b engages with the outer clutch portion 15b of the yoke intermittently under the influence of the elasticity of the coil spring 12, gradually increasing the rotational force of the yoke 15, and then the clutch piece 8b of the first slide member also engages with the inner clutch portion 15a of the yoke. meshes with

Thus, the power of the tractor 1 is smoothly, reliably, and efficiently transmitted to the tilling machine 2.

That is, the power connection/disconnection device for a tiller according to the present invention connects the output shaft 1a of the tractor 1 and the input shaft 2a of the tiller 20 via the transmission shaft 22 provided with universal joints 17, 23 at both ends. The transmission shaft 2 is connected to the output shaft 1a of the tractor 1.
2 is angularly displaced up and down, the output shaft 1a and the universal joint 17
In the tiller, the first universal joint 17 adjacent to the clutch mechanism 4 is configured by Hooke's shaft joint in which a cross-shaped rod is sandwiched between bifurcated members. , fitting a cap-shaped drive shaft 6 to the rear end of the output shaft 1a of the tractor 1 and fixing it with a pin 7, fitting and fixing the bottom of a cup-shaped clutch case 5 to the drive shaft 6 and opening it rearward; Outer spline 6 of drive shaft 6
The first slide member 8 is slidably and unrotatably fitted to a.
A tapered engagement surface 8a with a conical diameter is provided at the rear of the first slide member 8, and a clutch piece 8b is provided at the rear end of the first slide member 8.
and a second slide member slidably fitted to the first slide member 8.
A rearward diameter-expanding tapered hole of the slide member 10 is disposed so as to be removable from the engaging surface 8a of the first slide member 8, and is fitted into a plurality of recessed holes provided in the front surface of the second slide member 10. However, the flange member 1 has the front end of the compression coil spring 12 slidably fitted to the first slide member 8.
The flange member 11 is prevented from being removed by a retaining ring 13 fitted in a groove formed on the outer periphery of the first slide member 8 near the front end thereof, and the retaining surface 8 of the first slide member 8 is
When the engagement surface 10a of the second slide member 10 is in contact with the clutch piece 8b of the first slide member 8, the clutch piece 10b protrudes rearward from the clutch piece 8b of the first slide member 8.
On the other hand, a yoke 15 is supported via a ball bearing 16 on the small diameter portion of the rear end of the drive shaft 6.
The front extension of the sliding tube 19, which is slidably fitted on the outer peripheral surface of the sliding tube 19, is slidably fitted into the clutch case 5.
A thrust bearing 20 is disposed between the annular protrusion provided on the inner peripheral surface near the front end of the yoke 11 and the flange member 11, and the clutch piece 8b of the first slide member 8 and the second Clutch piece 1 of slide piece 10
Short inner clutch portions 15a that are respectively engaged and disengaged from 0b.
A long outer clutch portion 15b is provided in a protruding manner, and a spring 9 and a spring 14 are provided inside the clutch case 5 to bias the first slide member 8 and the second slide member 10 in the rear direction, respectively. A cap-shaped outer cylinder 21 is screwed onto the rear end, and the outer cylinder 2 is attached to the second universal joint 23.
1, and when the tilling machine 2 is in a raised state, the pressing member 17a of the first universal joint 17 pushes the sliding tube 19 forward, and the clara piece 8b is moved.

10b is separated from the inner clutch part 15a and the outer clutch part 15b, and when the tilling work machine 2 that has jumped up descends, first the clutch piece 10b of the second slide member 10 and the outer clutch part 15b are separated, then the first
Clutch piece 8 of slide member 8 and inner clutch part 1
5a, so that even if the tillage machine is used in an environment where it rotates frequently, the coupling clutch pieces sb and iob that constitute the clutch mechanism 4 can be connected to the coil spring 12, spring 14, and spring 9. Since the sliding engagement occurs in two stages under the influence of elastic interference, there is no damage to the clutch element, there is no strain on starting the tiller blades, and the tractor itself can be operated easily. It has many features such as ease of use.

In addition, in the present invention, the clutch piece 10b of the second slide member 10 is acted on by the elasticity of the coil spring 12 to the outer clutch portion 15b of the yoke and gradually increases the rotational force of the yoke 150 while intermittently anastomosing the outer clutch portion 15b of the yoke. 10
When b is separated from the outer clutch portion 15b, a slight gap is created momentarily between the engagement surfaces 8a and 10a, and the second slide is moved from the first slide member 8 through the engagement surfaces 8a and 10a. Power is prevented from being transmitted to member 10.

Therefore, the first slide member 8 and the second slide member 100
Since only the sliding frictional resistance around the cylindrical shape and the sliding frictional resistance between the coil spring 12 and the flange member 11 are transmitted from the first sliding member 8 to the second sliding member 10, the second sliding member 10 causes a rotation delay, which reduces the amount of relative slip between the outer clutch portion 15b and the clutch piece 10b (the same angular displacement is caused between the first slide member 8 and the second slide member 100 by the rotation angle corresponding to the amount of decrease). generated) clutch piece 10b and clutch part 1
This prevents wear and tear on 5b and improves durability.

[Brief explanation of the drawing]

The drawing shows one embodiment of the device according to the present invention.
The figure is an overall side view of the power tiller, Figure 2 is a vertically cut side view of the main parts when power is being transmitted, Figure 3 is the same view when power transmission is cut off, and Figure 4 is a side view of the power tiller. It is an exploded view for explaining the combination state of the 1st and 2nd slide member. DESCRIPTION OF SYMBOLS 1... Tractor, 1a... Output shaft, 2... Tilling work machine, 2a... Input shaft, 4... Clutch mechanism, 8
...First slide member, 8a...Engagement surface, 8b...
・Clutch piece, 10...Second slide member, 10a・
...Engaging surface, 10b...Clutch piece, 12...Coil spring, 15...Yoke, 15a...Inner clutch part, 15b...Outer clutch part, 17...
1st universal joint, 22... transmission shaft, 23... 2nd universal joint.

Claims (1)

[Scope of Claims] 1. The output shaft 1a of the tractor 1 and the input shaft 2a of the tilling machine 20 are connected via a transmission shaft 22 provided with a universal joint 17.23 at both ends, and the output shaft 1a of the tractor 1 In contrast, in a tiller in which the clutch mechanism 4 provided between the output shaft 1a and the universal joint 17 connects and disconnects when the transmission shaft 22 is angularly displaced up and down, the first clutch mechanism 4 adjacent to the clutch mechanism 4
The universal joint 17 is constituted by Hooke's shaft joint in which a cross-shaped rod is sandwiched between bifurcated members, and a cap-shaped drive shaft 6 is fitted to the rear end of the output shaft 1a of the tractor 1, and is fixed with a pin 7. The bottom of the cup-shaped clutch case 5 is fitted and fixed to the drive shaft 6 and opened rearward, and the rear part of the first slide member 8 is fitted to the outer spline 6a of the drive shaft 6 so as to be slidable and non-movable. The second slide member 10 is provided with a tapered engagement surface 8a with a conically enlarged diameter and a clutch piece 8b is provided at the rear end of the first slide member 8, and is slidably fitted to the first slide member 8. A compression coil spring 12 with a backward diameter expanding taper arranged removably on the engagement surface 8a of the first slide member 8 and fitted into a plurality of recessed holes formed in the front surface of the second slide member 10. A retaining ring 13 is fitted into a groove formed in the outer periphery near the front end of the first slide member 8, with the front end of the retaining ring 13 in contact with the rear surface of the flange member 11 that is slidably fitted to the first slide member 8. to prevent the flange member 11 from being removed, and with the engagement surface 10a of the second slide member 10 in contact with the engagement surface 8a of the first slide member 8, the clutch piece 8 of the first slide member 8
The second slide member 10 is provided with a clutch piece 10b that protrudes rearward from the rear end of the drive shaft 6, and a yoke 15 is supported via a ball bearing 16 on the small diameter portion of the rear end of the drive shaft 6, and is slidable on the outer peripheral surface of the yoke 15. The front extension of the sliding tube 19 fitted into the flange member 11 is slidably fitted into the clutch case 5, and the annular protrusion provided on the inner peripheral surface near the front end of the sliding tube 19 and the flange member 11 thrust bearing 2 between
0, and a short inner clutch portion 15a and a long outer clutch portion 15b are provided protruding from the front end surface of the yoke 15 to engage and disengage the clutch piece 8b of the first slide member 8 and the clutch piece 10b of the second slide member 10, respectively. Furthermore, a spring 9 and a spring 14 are provided inside the clutch case 5 to bias the first slide member 8 and the second slide member 10 rearward, respectively, and a cap-shaped outer cylinder 21 is provided at the rear end of the sliding cylinder 19. At the same time, a pressing member 17a provided separately from the outer cylinder 21 is fixed to the second universal joint 23, and when the tilling machine 2 is flipped up, the pressing member 17a of the first universal joint 17 is attached to the sliding cylinder. 19 forward and clutch piece 8b. 10b is separated from the inner clutch part 15a and the outer clutch part 15b, and when the tilling work machine 2 that has jumped up descends, first the clutch piece 10b of the second slide member 10 and the outer clutch part 15b are separated, then the first
A power connecting/disconnecting machine for a tiller, characterized in that a clutch piece 8b of a slide member 8 and an inner clutch portion 15a are connected.