JPH0720436Y2 - Speed change mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a speed change mechanism including a traveling drive mechanism and a working machine drive mechanism.

(B) Prior art In the conventional transmission mechanism including a continuously variable transmission,
Only the system was used for continuously variable transmission. For example, in the control machine and the combine, only the traveling system was continuously variable.

However, since there are many types of work such as management machines, and the rotation speed of the work equipment is also variable, when the rotation speed of the PTO shaft cannot be continuously changed, the rotation of the work equipment is adjusted. It was.

Therefore, since the rotation speed of the working machine cannot be changed, there is a problem that fine work cannot be performed.

(C) Problems to be solved by the present invention The present invention solves the above-mentioned problems of the prior art. In the past, only the traveling speed change was capable of continuously variable transmission. The speed of the work machine can be continuously changed by using a step transmission.

Also, in the case of towing work machines and axle work machines, the traveling system is continuously variable, and in the case of attachment work machines, it is possible to perform more detailed work by switching to the PTO system continuously variable transmission. is there.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

The rotation of the engine E is transmitted from the main shaft 2 to the continuously variable transmission A, and the rotation after shifting is transmitted by the continuously variable transmission A to the continuously variable transmission A.
In the configuration that outputs to 21, the two-sliding gears on the main shaft 2
26 and 27 are provided, and two continuous sliding gears 28 and 29 are mounted on the continuously variable transmission shaft 21.
A PTO shaft 22 and a counter shaft 2 are provided downstream of both shafts 2 and 21.
3 is arranged, two fixed gears 30 and 31 which selectively mesh with the sliding gears 27 and 28 are arranged on the PTO shaft 22, and the sliding gear 26 is arranged on the counter shaft 23.・ Fixed gears 32 and 35, which selectively mesh with 29, are arranged, and 2 by the continuously variable shift lever 43
By simultaneously sliding the continuous sliding gears 26 and 27 and the double sliding gears 28 and 29, the rotations of the PTO shaft 22 and the counter shaft 23 can be alternately changed to engine rotation and continuously variable rotation. is there.

(E) Embodiment The problems to be solved by the present invention and the means for solving the problems are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described.

In FIG. 1, a rotary tilling device R is arranged at a position opposite to the steering wheel 7, so that the operator can work while moving forward while moving forward or backward while holding the steering wheel. Showing the machine.

In the cultivator, an engine E is placed below a handle 7 side, and a transmission case M having a ring cone type continuously variable transmission A interposed therein is integrally fixed to the entire engine E.

The wheels 6, 6 are fixedly mounted on the axle protruding left and right from the mission case M.

A main unit side hitch 19 is fixed to the end of the transmission case M opposite to the engine E side, and the rotary side hitch 20 can be attached to and detached from the main unit side hitch 19 with one touch.

The rotary tiller R includes a tail wheel 4, a tiller cover 5, and a tiller 3.
Etc.

The essential part of the present invention will be described with reference to FIG.

The rotation of the engine E is transmitted to the ring cone type continuously variable transmission A by the main shaft 2, and the rotation after being continuously changed by the ring cone type continuously variable transmission A is output to the continuously variable transmission shaft 21. .

Therefore, the continuously variable transmission shaft 21 continuously changes the rotational speed by operating the continuously variable transmission lever of the ring cone type continuously variable transmission A.

Two sliding gears 26, 27 are spline-fitted on the main shaft 2 so as to be slidable right and left. In addition, continuously variable shaft
Two sliding gears 28 and 29 are also arranged on the 21.

Shifters 41 and 42 of the continuously variable shift lever 43 for simultaneously operating the left and right double sliding gears 26 and 27 and the double sliding gears 28 and 29
Are engaged.

The main shaft 2 and the continuously variable transmission shaft 21 are arranged on the same axis,
The PTO shaft 22 is arranged below it. Fixed gears 30 and 31 are fixed to the PTO shaft 22. The fixed gear 30 meshes with the gear 27 of the double sliding gears 26 and 27, and the fixed gear 31 can mesh with the gear 29 of the double sliding gears 28 and 29.

A counter shaft 23 is arranged below the PTO shaft 22,
On the counter shaft 23, forward / reverse switching double gears 33, 34 are spline-engaged and can slide left and right.

Further, on the counter shaft 23, a fixed gear 32 that meshes with the gear 26 of the double sliding gears 26 and 27, and double sliding gears 28 and 29.
A fixed gear 35 that meshes with the gear 29 in the inside is fixed.

The reverse shaft 24 is arranged below the counter shaft 23, and the forward / reverse switching dual gear 33.
A fixed gear 37 that meshes with the gear 33 in the 34 is fixed.

Further, a fixed gear 36 that constantly meshes with a fixed gear 38 on the pinion shaft 25 arranged in the lower stage is fixed.

On the pinion shaft 25, a fixed gear 39 that is meshed with the gear 34 of the forward / reverse switching double gears 33, 34 is fixed. Further, the pinion 40 fixed to the pinion shaft 25 drives the differential gear device.

With the above configuration, the fixed gear 30 on the PTO shaft 22
31 is configured to have substantially the same diameter, and fixed gears 32 and 35 on the counter shaft 23 are also configured to have the same diameter. Sliding on the main shaft 2 and the continuously variable transmission shaft 21 that mesh with these fixed gears. The gear is also a sliding gear
26 and 29 have the same diameter, and sliding gears 27 and 28 have the same diameter.

With the above-mentioned configuration, gear shifting is performed as follows.

First, operate the continuously variable shift lever 43 left and right to move the shifter.
When 41 and 42 are moved left and right, the double sliding gears 26 and 27 and the double sliding gears 28 and 29 engaged with the shifter 41 and 42 are simultaneously slid left and right.

When the continuously variable transmission switching lever 43 is operated to the right side in the drawing of FIG. 2, the gear 27 of the double sliding gears 26 and 27 meshes with the fixed gear 30, so that the PTO shaft 22 becomes the ring cone. A constant rotation speed of the engine E without transmission of the continuous variable transmission A is transmitted.

On the other hand, the gear 29 of the double sliding gears 28 and 29 is the counter shaft.
Since it meshes with the fixed gear 35 of 23, the rotation of the counter shaft 23, the reverse shaft 24, and the pinion shaft 25 which are related to the traveling are continuously transmitted by the ring cone type continuously variable transmission A, so that the rotation is transmitted. is there.

On the contrary, when the continuously variable shift lever 43 is slid to the left side in FIG.
The fixed rotation speed of the engine E is transmitted to the counter shaft 23 by meshing with the fixed gear 32 above.

On the other hand, the gear 28 of the double sliding gears 28 and 29 meshes with the fixed gear 31 on the PTO shaft 22, so that the PTO shaft 22 is continuously variable through the ring cone type continuously variable transmission A. The speed-changed rotation is transmitted.

Forward / backward travel can be achieved by switching the forward / backward switching dual gears 33, 34 on the fixed gear 35 with the forward / backward speed change lever.

Hitch on the machine side in FIGS. 3, 4, 5, and 6
The configuration of the mounting portion between the hitch 20 and the rotary hitch 20 will be described.

By mounting the main unit side hitch 19 and the rotary side hitch 20, the rotation of the output shaft 11 in the main unit side hitch 19 is transmitted to the dog clutch 14 on the rotary side hitch 20 side via the dog clutch 13. The rotation of the dog clutch 14 is transmitted to the rotary drive shaft 12.

The hitch of the machine side hitch 19 and the rotary side hitch 20 can be easily attached / detached by operating the machine forward / backward and up / down while the operator holds the handle 7.

That is, the rotary tiller R is placed on the ground in a state as horizontal as possible, and the main unit side hitch 19 of the main unit is approached from below toward the rotary side hitch 20 of the rotary tiller R. To go.

Further, since the engaging fitting grooves 19a, 19a are provided in the angular portion provided on the upper portion of the hitch 19 of the main body, the engaging fitting groove 19a is formed.
a ・ 19a, the engaging side rod 18 provided on the side of the rotary hitch 20
Is inserted.

The engaging lateral rod 18 is horizontally mounted on the upper ends of the support bars 15 and 15 projecting upward from the left and right of the rotary hitch 20.

Then, by engaging and inserting the engaging lateral rod 18 into the locking fitting grooves 19a, 19a, the engagement of the upper end portion of the hitch is completed, and the operator pushes down the handle 7 in this state, whereby the locking fitting is performed. The grooves 19a and 19a and the engaging lateral rod 18 are pivotally supported to rotate in a direction in which the lower side of the main unit side hitch 19 and the lower side of the rotary side hitch 20 come into close contact with each other, and the dog clutch 13 and the dog clutch
It is also combined with 14.

Then, with the lower ends of the machine side hitch 19 and the rotary side hitch 20 being in close contact with each other, the operator turns the lock lever 16 extending toward the handle 7,
The lock hook 17 pivots downward about the pivot shaft 10 and is engaged with the lock lateral rod 8 of the downward projecting corner portion 9/9 projecting from the lower end of the rotary hitch 20.

As a result, the combined attachment of the main unit side hitch 19 and the rotary side hitch 20 is completed, and at the same time, the dog clutch 13 and the dog clutch 14 are also in the combined state.

In this configuration, when the engagement fitting grooves 19a, 19a and the engagement horizontal rod 18 are engaged with each other, when the rotary tiller R or this machine is tilted from the horizontal posture, the engagement fitting grooves 19a are temporarily provided. -A part of the engaging lateral rod 18 is fitted inside 19a, but there is a case where both are not in a horizontal state, so in such a case,
The left and right sides of the unit hitch 19 and the rotary side hitch 20 do not match, and the unit side hitch 19 and the rotary side hitch do not match.
In order to match the left and right directions of 20, the guide rods 1L and 1R opened in the shape of "C" toward the side of the machine side hitch 19 are provided on the left and right of the downward projecting corners 9 and 9. is there.

(F) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

First, it was possible to improve the speed of the working machine by using the same one continuously variable transmission by improving that only the traveling speed can be continuously changed. Of.

Secondly, in the case of a towing work machine or an axle work machine, the traveling system is continuously variable, and in the case of an attachment work machine, the PT is used.
By switching to O-type continuously variable transmission, detailed work became possible.

Thirdly, a ring cone type continuously variable transmission A is used for the traveling transmission system.
Since the portion of the ring cone is brought into contact with the vehicle even when the vehicle is parked, the portion also serves as a parking brake.

Fourth, it is not necessary to arrange two sets of continuously variable transmissions in the two systems of the traveling drive system and the PTO drive system, so the cost is low,
It was possible to provide a mechanism that enables continuously variable transmission to both power transmission systems.

[Brief description of drawings]

FIG. 1 is an overall side view of the cultivator, FIG. 2 is a skeleton diagram in a mission case M of the cultivator, FIG. 3 is a side sectional view of a hitch part of a rotary cultivator R, and FIG. 4 is the hitch part. FIG. 5 is a side view showing a state in which the hitch portion is attached, and FIG. 6 is a plan view showing the same. A: Ring-cone type continuously variable transmission E: Engine M: Mission case 1L / 1R: Guide rod 2: Main shaft 21: Continuously variable shaft 43: Continuously variable shift lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takayasu Sato, 428 Enami, Okayama City, Okayama Prefecture Seirei Industry Co., Ltd. (56) Reference JP-A-63-103798 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A structure in which the rotation of an engine E is transmitted from a main shaft 2 to a continuously variable transmission A, and the rotation after shifting by the continuously variable transmission A is output to a continuously variable transmission shaft 21. Two
The continuous sliding gears 26 and 27 are provided, the two continuous sliding gears 28 and 29 are provided on the continuously variable transmission shaft 21, and the PTO shaft 22 and the counter shaft 23 are arranged on the downstream side of both the shafts 2 and 21. Above the sliding gear 2 on the PTO shaft 22
Two fixed gears 30 and 31 which selectively mesh with 7/28 are arranged, and fixed gears 32 and 35 which selectively mesh with the sliding gears 26 and 29 are arranged on the counter shaft 23. PTO shaft 22 and counter shaft 23 by arranging them and simultaneously sliding the double sliding gears 26 and 27 and the double sliding gears 28 and 29 by the continuously variable transmission switching lever 43.
The speed change mechanism is characterized in that the rotation of the engine can be alternately changed to engine rotation and continuously variable rotation.