JPS6339448B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has an engine disposed at the front of the aircraft body, and a transmission case containing a transmission mechanism to the axle is disposed at the rear of the engine. The present invention relates to a walking type agricultural management machine, and specifically relates to its transmission structure.

[Conventional technology]

In order to improve workability and operability, walk-behind agricultural management machines are also required to be equipped with continuously variable transmissions.
It has been considered to configure the transmission system between the engine and the transmission case as a belt-type continuously variable transmission.

The axle rotation speed of such agricultural management machines is required to be around 10 to 120 rpm in normal rotation (forward rotation).
The belt-type continuously variable transmission has a gear ratio range of about 1:3 to 4 at most, and therefore has a structure in which a gear shifting means is provided within the transmission case to further change gears.

[Problem that the invention seeks to solve]

However, in order to operate the gear shifting means inside the transmission case, the operating system such as a shift rod must be penetrated through the case, which requires an oil-tight structure for the case, which is disadvantageous in terms of maintenance. A means for preventing troubles caused by the shift gear coming off by itself is also required, which tends to increase the overall cost.

This invention attempts to solve the above problems by improving the transmission structure.

[Means for solving problems]

In order to achieve the above object, the present invention has a characteristic configuration in which the engine is oriented so that its output shaft projects toward the rear of the aircraft body, and a disk is provided at the rear end of the output shaft. A drive disk of a continuously variable transmission is provided, and a passive disk of a disk-type continuously variable transmission that is rotatable around a horizontal axis and slidable in the axial direction is provided behind the drive disk, and the passive disk is attached to the horizontal shaft to which the passive disk is attached. , one pulley of the belt type continuously variable transmission is installed, and the other pulley of the belt type continuously variable transmission is installed on the input shaft protruding from the horizontal wall of the transmission case, and the output of the engine is transferred to the disc type continuously variable transmission. The main feature is that the transmission is configured to be transmitted via a transmission and a belt-type continuously variable transmission.

[Effect]

According to the above configuration, it is possible to set a speed change range of approximately 1:4 with the disc type continuously variable transmission and obtain a speed ratio range of approximately 1:3 with the belt type continuously variable transmission. By applying deceleration at , the axle rotational speed can be set approximately within the required range described above.

〔Effect of the invention〕

Therefore, according to the present invention, the transmission case only needs to perform deceleration, there is no need to provide the transmission case with a means for operating the shift shaft or a seal structure therefor, and there is almost no need to maintain and inspect the transmission case.
Furthermore, since there is no need to provide a shift gear within the case, there is no need for gear self-separation prevention means, and the overall structure of the transmission case can be extremely simplified and costs can be reduced.

In order to expand the speed range by using a disc-type continuously variable transmission and a belt-type continuously variable transmission, the output shaft of the engine was set to face rearward, and a disc-type continuously variable transmission was installed at the rear end. ,and,
The passive shaft of the disc-type continuously variable transmission is configured with a pulley of the belt-type continuously variable transmission, so for example, if the output shaft of the engine is set horizontally, and the end of the output shaft Compared to the case where a continuously variable transmission is provided and the transmission is configured to be transmitted from the disc type continuously variable transmission to a relay bevel gear and from the relay bevel gear to a belt type continuously variable transmission disposed on the side of the transmission case. This has the advantage of making the aircraft more compact in both the longitudinal and lateral directions.

〔Example〕

FIG. 3 shows a walking type agricultural management machine according to the present invention, in which an engine 2 is mounted on the front part of the machine body 1, a transmission case 4 that pivotally supports running wheels 3 is provided in the center part, and a transmission case 4 is provided in the rear part. is equipped with a rotary tiller 10.

As shown in FIGS. 2 and 3, a drive pulley 6 is provided on the output shaft 5 of the engine 2. As shown in FIGS. This drive pulley 6 is composed of a fixed side split pulley 6a fixed to the output shaft 5, and a split pulley 6b loosely fitted to the boss portion of this split pulley 6a. The drive disk 7 of the disk type continuously variable transmission A is attached to the idle side split pulley 6b.
are integrally provided.

A spline shaft (horizontal shaft) 8 serving as a first output shaft having a horizontal axis perpendicular to the imaginary axis of the output shaft 5 is mounted via bearings 9, 9.

The bearings 9, 9 are connected to a stay 12, which extends from the transmission case 4 provided in the center of the fuselage 1.
12, respectively.

A passive disk 13 is mounted on the spline shaft 8.
is swingably provided, and an elastic ring 13a is fixed to its outer periphery so as to come into contact with the rear facing surface 7a of the drive disk 7.
The passive disk 13 has a groove 1 for shifter operation.
4 is provided, and a shifter 15 is engaged here.

The shifter 15 is pivotally connected to the transmission case 4 so as to be able to swing around a vertical axis, and is configured to be able to change speed with a lever 35 at the hand of the handle 19 via an arm 17 and a release wire 18. A variable-speed split pulley 20 is provided at one end of the spline shaft 8, and a belt 23 is wound between the split pulley 20 and a passive pulley 22 provided on the input shaft 21 of the transmission case 4.

Reference numeral 24 denotes a tension pulley, which is wire-linked to a speed change lever 36 provided on the handle 19, and the effective winding diameter of the split pulley 20 is changed by adjusting the pressing position on the belt 23 by operating the lever. Belt-type continuously variable transmission device B for driving
is configured.

The other end of the input shaft 21 is butt-fitted to a PTO output shaft 25 mounted on the opposite side, and is provided with a gear 27 that is one of a group of reduction gears that transmits gear power to a lower axle 26. It is being Said
A bevel gear 28 is provided on the PTO shaft 25, and a gear 29 that meshes with this gear is provided on a transmission shaft 30 that projects forward from the transmission case 4. The transmission shaft 30 extends above the split pulley 6 and is mounted on a bearing 33 of the column.

This power transmission shaft 30 is configured into two parts: a first shaft part 30a, a second shaft part 30b located on the same axis with a gap, and both shaft parts 30a, 30b.
The cylindrical shaft portion 30c is spline-fitted over the
Then, this cylindrical shaft portion 30c is connected to the both shaft portions 30.
30d and a spring 30d that biases the members a and 30b so that they are always connected together. The first shaft portion 30a is provided with a passive pulley 31 configured in a split shape so that the speed can be changed.
A belt 32 is wound around the split pulley 6 and the split pulley 6.

34 is a tension pulley whose pressing position against the belt 32 is adjustable;
The main clutch function is not only to act as a clutch to the spline shaft 8, but also to act as a clutch to the spline shaft 8, and is linked by a wire to a lever 37 provided on the handle 19. A belt type continuously variable transmission device C for working is constituted by the split pulley 6 corresponding to the split type passive pulley 31, the belt 32 wound around these, and the tension pulley 34. There is.

In the disc-type continuously variable transmission A, the shift range of the passive disc 13 is set so as to be able to switch between forward and reverse rotation, and the gear ratio range in normal rotation is set to about 1:4. Further, the gear ratio range of the belt type continuously variable transmission device B is set to about 1:3.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking agricultural management machine according to the present invention, and FIG. 1 is a partially vertical side view of the transmission part, and FIG.
The figure is a partial cross-sectional plan view of the transmission part, and FIG. 3 is a side view of the entire transmission part. 2...Engine, 4...Transmission case, 5...Output shaft, A...Disc type continuously variable transmission, 7...Drive disk, 8...Horizontal shaft, 13...Passive disk, B...Belt type Continuously variable transmission, 20, 22...
...Pulley, 21...Input shaft, 26...Axle.

Claims (1)

[Claims] 1. In a walking agricultural management machine in which an engine 2 is disposed at the front of the machine body, and a transmission case 4 containing a transmission mechanism to an axle 26 is disposed at the rear side of the machine, the engine 2 is connected to its output. The shaft 5 is oriented and arranged so as to protrude toward the rear of the aircraft body, and a drive disc 7 of a disc type continuously variable transmission A is provided at the rear end of the output shaft 5,
A passive disk 13 of a disk-type continuously variable transmission device A that is rotatable around the horizontal shaft 8 and slidable in the axial direction is provided behind it, and a belt-type continuously variable transmission is attached to the horizontal shaft 8 to which the passive disk 13 is attached. Device B
At the same time, the other pulley 22 of the belt type continuously variable transmission device B is installed on the input shaft 21 protruding from the horizontal wall of the transmission case 4, and the output of the engine 2 is transferred to the disk type continuously variable transmission device. A walking agricultural management machine configured to transmit power via device A and belt type continuously variable transmission device B.