JPS5938463B2 - PTO transmission - Google Patents

Description

[Detailed description of the invention] The present invention relates to a PTO transmission.

Power extraction devices for driving working machines such as rotary tillers, combine harvesters, mowers, sprayers, forage harvesters, etc. with the power of a tractor engine are known, and are usually connected directly to a PTO shaft consisting of a spline shaft or by a belt wheel. , connected to the work machine via a chain sprocket, etc.

This power take-off device (hereinafter referred to as PTO) usually has a
Two types are standardized: 40rlllllO and iooorpm, the former usually having 6 splines, and the latter having 12 involutes.

Therefore, if the rotational speed of the same spline shaft is switched between high and low speeds, it is extremely dangerous if the tractor reaches high output.

That is, when a working machine for 54011) m was rotated at 1000 rpm, for example, the chopper of a forage harvester would fly out due to centrifugal force, which was not only extremely dangerous, but also caused such vibration that it could become unusable.

The present invention makes it possible to change the speed according to the above-mentioned two types of PTO shafts by simply installing them in a converting manner.For this purpose, the present invention provides a PTO-based high-low switching transmission mechanism. , an input side transmission shaft comprising a high-speed input side transmission gear and a low-speed input side transmission gear spaced apart in the axial direction, and a high-speed output side transmission gear and a low-speed output side transmission gear that are respectively interlocked with the elevation input side transmission gear. An output side speed change shaft is provided with an output side speed change gear that can be relatively rotated freely, and an output side speed change shaft that is equipped with a chic for turning on and off the high and low output side speed change gears, wherein a through hole is formed in the axial center of the output side speed change shaft. , a button is slidably inserted into the through hole, and an insertion side end of the button is in contact with a shifter speed change operation mechanism biased to switch the chic in either a high or a low direction; Furthermore,
PTO shafts of different types are replaceably attached to the shaft end side of the output side transmission shaft, and when one PTO shaft is attached to the shaft end side of the output side transmission shaft, the button is pushed forward and the biasing force is applied. When the shifter is able to be switched to high or low and the other PTO shaft is attached to the shaft end side of the output speed change shaft, the shifter is moved to either high or low by the biasing force. The present invention provides a PTO transmission characterized by being switchable.

Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, numeral 1 is a transmission case which becomes the tractor body, and numeral 2 is a PTO propulsion shaft which is linked to the engine.

Reference numeral 3 denotes a first transmission shaft on the input side which is supported by bearings 4, 4, and two transmission gears 5, 6 are fixedly installed at an axial distance, and are connected to the propulsion shaft 2 by a coupling 7. The transmission gear 5 is connected to the high-speed input side, and the transmission gear 6 is connected to the low-speed input side.

Reference numeral 8 denotes a second speed change shaft on the output side that is supported by bearings 9, 9, and has a through hole 10 bored in its shaft center and a joining flange 11 at its outer end.

Stepped transmission gears 12 and 13, which are always in mesh with the transmission gears 5 and 6, are rotatably supported on the second transmission shaft 8, and a shifter 1 serving as a clutch is disposed between the transmission gears 12 and 13.
4 is slidably provided.

The speed change gear 12 has an engaging portion 12A on the high speed output side, and the speed change gear 13 has an engaging portion 13A on the low speed output side.

A bushing 15 is inserted into the through hole 10 so as to be slidable in the axial direction, is longer than at least the axial length of the second speed change shaft 8, and has a spherical surface 16 at its inner end.

17 is a shift arm that swings around a fulcrum 18;
The spherical portion 16 is always in contact with the arm 17 midway.

Reference numeral 19 denotes a shift rod, which is mounted parallel to the second transmission shaft 8 and has a shift arm 2 at one end of which engages with the shifter 14.
0 is fixedly installed, and the engagement member 2 of the shift arm 17 is fixedly attached to the other end side.
1 is fixedly installed, and the arm 17 is always in elastic contact with the spherical portion 16 by a spring 22.

The PTO-based elevation switching transmission mechanism and the transmission operation mechanism, which are made up of the above-mentioned parts and members, are covered by a transmission case 23 attached to the transmission case 1.

24 is a PTO shaft consisting of 6 spline shafts, 25 is 12
The PTO shaft is made of a main spline shaft, and joint flanges 26 and 27 are formed at each end, and can be attached to the joint flange 11 of the second speed change shaft 8 via bolts 30, and the former The end face of the PTO shaft 24 is flat, but a concave portion 28 is provided in the center of the end face where the two PTO shafts are mated.

Next, the operation of the embodiment will be explained.

When the PTO shaft 24 is joined to the second shift shaft 8 with flange bolts as shown in FIG. It will swing counterclockwise against the

Then, the shift rod 19 is slid and the shifter 14 integrates the engagement portion 12A of the gear 12 and the gear 29, and thereby the power from the propulsion shaft 1 is transferred from gear 5 to gear 1.
2→gear 29→second transmission shaft 8 to be transmitted to the PTO shaft 24.

On the other hand, when the PTO shaft 2 shaft joint 52 is installed as shown in the figure instead of the PTO shaft 24, the PTO shaft 2 shaft joint 5 recess 28 is recessed, and the shift arm 17 is elastically pulled by the spring 22. Therefore, the button 15 is partially intruded into the recess 28, and the shifter 14 is moved to the engagement part 13A of the gear.
and gears 13 and 29 are integrated.

The present invention provides a PTO-based elevation/low-switching transmission mechanism that includes an input-side transmission shaft having a high-speed input-side transmission gear and a low-speed input-side transmission gear spaced apart from each other in the axial direction; The output side is composed of an interlocked high-speed output-side transmission gear and a low-speed output-side transmission gear that are relatively rotatable, and an output-side transmission shaft that is equipped with a sickle for turning on and off the output-side transmission gear for high and low speeds, respectively. A through hole is formed in the axis of the speed change shaft, a button is slidably inserted into the through hole, and an insertion side end of the button is biased to switch the shifter in either a high or low direction. It is connected to the shift operation mechanism for sick gear, and furthermore, different types of PTO shafts are replaceably attached to the shaft end side of the output side shift shaft, and one of the PTO shafts is
When the TO shaft is attached to the shaft end side of the output side transmission shaft, the bushing is pushed forward and the chic can be switched to either high or low against the bias, and the other PTO shaft is attached to the output side transmission shaft. Since this relates to a PTO transmission device characterized in that, when attached to the shaft end side of By replacing and attaching the shaft to the shaft end side of the output side speed change shaft, it is possible to easily and reliably obtain two types of high and low speed change according to each work machine.For example, 540 r
I) There is no risk of rotating the m-type work equipment at 1000rllllll, so it is safe and has the advantage of no vibration.Furthermore, by simply selectively attaching and detaching the PTO shaft, the required speed can be changed automatically. There are advantages such as being able to obtain

[Brief explanation of drawings]

The drawings show an example of the present invention, and FIG. 1 is a sectional view of the same during a gear shift, and FIG. 2 is an enlarged sectional view of the main part during a gear shift. 2...PTO propulsion shaft, 3...Input side transmission shaft, 5.6...Input side high/low transmission gear, 8...
...Output side gear shift shaft, 12, 13...Output side high/low speed change gear, 14...Shifter, 15...
...butsusha, 17,20...shift arm,
19...Shift arm, 24゜25...
・Two PTO shafts, 28... recess, 30...
···bolt.

Claims (1)

[Scope of Claims] I A PTO-based elevation switching transmission mechanism includes an input-side transmission shaft having a high-speed input-side transmission gear and a low-speed input-side transmission gear spaced apart from each other in the axial direction, and the elevation input side. A high-speed output-side transmission gear and a low-speed output-side transmission gear that are respectively linked to the transmission gear are relatively rotatable, and an output-side transmission shaft is provided with a shaft that turns on and off the output-side transmission gear for high and low speeds, respectively. A through hole is formed in the axis of the output side speed change shaft, a button is slidably inserted into the through hole, and an insertion side end of the button is biased to switch the chic in either a high or a low direction. It is in contact with the gear shift operation mechanism for Schick, and furthermore,
PTO shafts of different types are replaceably attached to the shaft end side of the output side transmission shaft, and when one PTO shaft is attached to the shaft end side of the output side transmission shaft, the button is pushed forward and the biasing force is applied. When the other PTO shaft is installed on the shaft end side of the output side transmission shaft, the sickle can be switched to either the high or low position with the above bias. A PTO transmission device characterized in that it is capable of switching to.