JPH093A - Forward and reverse tillage device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a forward-reverse cultivating device, the width of the center drive case 3 is narrowed, and the downward protrusion of the bottom is reduced. [Structure] In a center drive case 3, a normal rotation shaft 1 and a reverse rotation shaft 2 are axially mounted in an inner-outer dual configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward / reverse cultivating device having a forward cultivating claw and a reverse cultivating claw. To reduce the size and weight of the tiller.

[0002]

2. Description of the Related Art In the technique disclosed in Japanese Unexamined Patent Publication (Kokai) No. 5-56703, the center drive case 9 is provided with a single transmission shaft 9a, but the rotor shafts 11 and 22 are normally rotated. A counter gear shaft 77 and a transmission case portion are provided around the rotor shafts 11 and 22 in order to transmit the reverse rotation.

The present invention aims to reduce the size and weight of the transmission case portion around the rotor shaft by making the diameter as small as possible.

[0004]

According to the present invention, a forward rotation shaft 1 and a reverse rotation shaft 2 are axially mounted in a center drive case 3 in the form of an inner and outer double shaft, and the lower end portion of the center drive case 3 is The rotor shaft 5 of the forward rotation rotor having the plowing pawls 4 on the left and right outer sides and the rotor shaft 7 of the reverse rotation rotor having the plowing pawls 6 arranged close to the outside of the center drive case 3 are configured as inner and outer double shafts. The forward rotation shaft 1 or the reverse rotation shaft 2 and the rotor shafts 5 and 7 are connected to each other by the bevel gears 8 to 12 to form a forward and reverse rotation tilling device.

[0005]

By the transmission rotation of the forward rotation shaft 1 and the reverse rotation shaft 2 in the center drive case 3, the rotor shaft 5 is rotated forward through the bevel gears 8 to 11, and the rotor shaft 7 is rotated. Is rotated in reverse. As a result, the plowing pawls 6 are reversely rotated near the left and right sides of the center drive case 3, and the plowing pawls 4 are normally rotated outwardly.

In such a forward-reverse cultivator, the center drive case 3 has an internal normal-rotation shaft 1 and reverse-rotation shaft 2.
Since and have a double shaft shape, they do not have a large outer diameter, and the structure of the center drive case 3 is reinforced by this double shaft shape. Further, since the bevel gears 9, 11, 12, etc. for transmission which are fixed to the rotor shafts 5, 7 at the lower end of the center drive case 3 are also covered, the diameter of the bevel gear case is configured to be downward. The projection diameter can be made small, and the cultivation depth can be kept large by the short tilling claws 4 and 6, and a small and light forward / reverse tilling device is obtained.

[0007]

EXAMPLE A hand tractor has wheels 13 mounted on the left and right sides of a transmission case 26, and driven by an engine E mounted in the front part to drive a transmission belt in a belt case 15 to a gear mechanism or a gear mechanism in the transmission case 26. It can be transmitted by driving through a chain mechanism. The center drive case 3 is provided rearward and downward, and the tiller 16 is provided at the lower end of the center drive case 3, and the forward rotation shaft 1 and the reverse rotation shaft 2 are interlocked with each other from the upper portion of the transmission case 26 so that the tiller claws 4 of the tiller 16 are straightened. It can be rotationally driven, and the plowing claw 6 can be reversely rotationally driven. Reference numeral 17 is a steering wheel.

The center drive case 3 has a cross section of a round pipe or an elliptical pipe, and has an upper end connected to an upper part of the transmission case 26 and a bevel gear case 18 at a lower end. The bevel gear case 18 is attached to the pipe-shaped reverse shaft 3
The lower end of the normal rotation shaft 2 is supported by a bearing 19, and the lower end of the forward rotation shaft 2 is supported by a needle bearing 20 inside the reverse rotation shaft 3. Further, the pipe-shaped rotor shaft 7 in the direction orthogonal to the normal rotation shaft 1 is borne by the bearing 21, and the rotor shaft 5 is borne in the rotor shaft 7 by interposing the needle bearing 22.

A forward bevel gear 9 integral with the forward rotor shaft 5 is engaged with one side of a bevel gear 8 fixed to the lower end of the forward rotation shaft 1, and a reverse bevel gear 12 of a reverse rotation rotor shaft is engaged with the opposite side. . The normal rotation of the forward rotation shaft 1 causes the rotor shaft 5 to rotate in the forward direction and the one side rotor shaft 7 to rotate in the reverse direction. Further, the bevel gear 10 at the lower end of the reverse rotation shaft 2 meshes with the reverse rotation bevel gear 11 of the rotor shaft 7 on the same side as the forward rotation bevel gear 9 to transmit reverse rotation.

A forward rotation rotor boss 23 is connected to a pin 25 on the outside of the forward rotation shaft 1, and a plowing claw 4 disposed on the rotation peripheral surface of the forward rotation rotor boss 23 in the forward direction F of the machine body is attached from the upper front side. A normal rotation A is made so that the ball is driven backward and backward.
Further, a reverse rotation rotor boss 24 is connected to the outer side of the reverse rotation rotor shaft 7, and the reverse rotation B is performed so that the tilling pawl 6 disposed on the rotation peripheral surface of the reverse rotation rotor boss 24 is driven from the upper rear side to the lower front side.
Is done.

The gear ratio between the bevel gear 8 of the forward rotation shaft 1 and the forward rotation bevel gear 9 of the rotor shaft 5 is the gear ratio between the bevel gear 10 of the reverse rotation shaft 2 and the reverse rotation bevel gear 11 of the rotor shaft 7 meshed therewith. It is set almost the same as. Further, of course, the gear ratio of the reverse bevel gear 12 on the side of the reverse rotor boss 24 meshing with the bevel gear 8 is also set to the same.

3 and 4, the difference from the above example is that
The operation structure of the speed change clutch lever 27 in the steering handle 17 is configured such that the speed change clutch lever 27 along the grip portion 28 of the handle 17 is moved left and right in the direction along the grip portion 28 so that the low speed side L and the high speed side. By switching to H, gear shifting and clutch operation can be performed.

A grip portion 28 of the steering handle 17 is connected in a left and right loop form, and a bracket for supporting both left and right ends of the shift clutch lever 27 in a vertically rotatable and left and right slidable manner on the left and right sides. 29 is provided. Reference numeral 30 denotes a left-right lever stay fixed to each of the brackets 29 by a roll pin 31, and a lever stay 30 on one side has a detent groove 32.

The loop-shaped speed change clutch lever 27 has bosses 33 on both left and right ends, and these bosses 33 are fitted to the lever stay 30. Also, one boss 33
There is a detent ball 34 fitted in the detent groove 32.
Is elastically fitted by the spring 35, so that the clutch lever 29 can be maintained at the left and right moving positions L and H. The shift clutch lever 27 is formed in a loop shape so as to substantially follow the grip portion 28 of the steering handle 17.

Protrusions 36 are provided on the pair of left and right boss portions 33 of the shift clutch lever 27 as described above, and the bracket 2
9 is engaged with an arm pin 40 of an arm 39 which is rotatable about a pin 37 and interlocks with a wire 38, and rotates the speed change clutch lever 27 against the spring 41 toward the lower grip 28 side. The wire 38 can be pulled by means of which the belt tension clutch pulley 42 or 43 (FIG. 2) connected to the wire 38 can be entered and operated. The clutch pulleys 42 and 43 are provided with two low speed transmission belts 44 and high speed transmission belts 45 between the drive pulley of the engine E and the input shaft pulley on the transmission case 26 side. These belts 4
By separately tensioning the clutch pulleys 4, 45 with the clutch pulleys 42, 43, the input shaft pulley can be switched between low speed L and high speed H for transmission.

When the shift clutch lever 27 is moved to the left side, it is moved to a low speed position, the left side protrusion 36 engages with the arm pin 40, and the tension clutch pulley 42 of low speed L is tensioned to the belt 44 to be operated. At this time, the right side protrusion 36 cannot engage with the arm pin 40 and cannot be operated. When the high speed H shift is performed, the shift clutch lever 2
7 to the right to move the right-side protrusion 36 to the arm pin 4
The same operation may be performed by engaging with 0, whereby the tension clutch pulley 43 on the high speed side tensions and transmits the belt 45.

[Brief description of drawings]

FIG. 1 is a rear view of a cultivating device section.

FIG. 2 is an overall side view.

FIG. 3 is a plan view of a steering handle portion and an enlarged plan view of a part thereof.

FIG. 4 is a perspective view of a steering handle and an enlarged side view of a part thereof.

[Explanation of symbols]

 1 Forward rotation shaft 2 Reverse rotation shaft 3 Center drive case 4 Tilling pawl 5 Rotor shaft 6 Tilling pawl 7 Rotor shaft 8 Bevel gear 9 Bevel gear 10 Bevel gear 11 Bevel gear 12 Bevel gear

Claims (1)

[Claims] 1. A forward rotation shaft 1 and a reverse rotation shaft 2 are axially mounted in a center drive case 3 in the form of an inner and outer double shaft, and a lower end portion of the center drive case 3 has a plowing claw 4 on the left and right outer sides.
The rotor shaft 5 of the normal rotation rotor for arranging the rotor and the rotor shaft 7 of the reverse rotor for arranging the plowing pawl 6 close to the outside of the center drive case 3 are mounted as the inner and outer double shafts, and A forward / reverse cultivating device in which the shaft 1 or the reverse rotation shaft 2 and the rotor shafts 5 and 7 are linked by bevel gears 8 to 12.