JPH07337Y2 - Work machine power take-out device - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a mechanism for controlling the rotational speed of a PTO shaft for driving an attached work machine in a combine or a tractor.

(B) Conventional technology Conventionally, the HST type transmission attached to the axle drive is
A one-way clutch is installed on the pump shaft and the motor shaft, and when the motor speed is low, a serial gear train that transmits power between the input shaft and the counter shaft without passing through the HST type transmission is provided as a bypass. The technology is known.

(C) Problems to be solved by the invention Conventionally, when one-way clutches are provided on the pump shaft and the motor shaft of the HST transmission, if the rotation of the counter shaft is low, It is possible to rotate the counter shaft at the same number of revolutions of the input shaft that is not subjected to the speed change action. As a result, a constant PTO shaft rotation speed was obtained even when the traveling speed was slow.

In the present invention, the configuration is adopted in the case of the low speed traveling, and a control mechanism for eliminating the trouble caused by the rotation of the PTO shaft being too fast in the high speed traveling is additionally provided.

That is, when the traveling speed is too fast, the rotation speed of the PTO shaft is too fast, and in the combine, the grain tip is hit or hooked by the grain culm raising device, and there is a loss of grain at the stage of raising. It happens.

Therefore, in the present invention, the pulley type transmission is interposed so as to suppress the increase in the rotation of the PTO shaft when the traveling speed exceeds a certain level.

(D) Means for Solving the Problems The object of the present invention is as described above, and the configuration for achieving the object will be described below.

In an axle drive equipped with an HST transmission H, an input shaft 1 to which power from an engine is input and a pump shaft 4 are connected, a pump side one-way clutch 8 is provided on the input shaft 1, and A motor-side one-way clutch 6 is provided between the motor shaft 5 and the counter shaft 2 of the HST type transmission H, and when the motor shaft 5 is below a certain rotation speed, the input shaft 1 through the pump-side one-way clutch 8 is used. Gear trains 9, 10, 11 for directly transmitting power to the counter shaft 2 are provided between the pump side one-way clutch 8 and the counter shaft 2, and further between the PTO shaft 3 arranged in parallel with the counter shaft 2, A pulley-type transmission that shifts the pulley width to the deceleration side by the rotation of the governor 17 when rotating at a certain number of revolutions or more is interposed.

(E) Embodiment The purpose and construction of the present invention are as described above. Next, the construction of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a side sectional view of a power take-out device for a working machine of the present invention, and FIG. 2 is a graph showing rotation of a PTO shaft controlled by the configuration of the present invention.

The overall structure will be described with reference to FIG. An HST type transmission H is attached to the right side of the mission case MC, and a pulley type transmission is placed on the left side.

A hydraulic pump P and a hydraulic motor M are arranged inside the HST transmission H, and the pump shaft 4 from the hydraulic pump P
However, the motor shaft 5 projects from the hydraulic motor M toward the inside of the mission case MC.

An input pulley 23 is arranged at the left end of the input shaft 1 protruding leftward from the mission case MC, and a belt is wound from the engine toward the input pulley 23.

The right end of the input shaft 1 is fixed to the pump shaft 4 by a key, and the hydraulic pump P of the HST transmission H is constantly driven by the rotation of the input shaft 1.

Further, a pump-side one-way clutch 8 is provided on the outer circumference of the input shaft 1, and the pump-side one-way clutch 8 is faster than the lower counter shaft 2 is driven by the gear train 9, 10, 11. This is a one-way clutch for releasing the rotation and freeing it when the motor shaft 5 is rotated at a rotation speed, that is, the rotation speed a or more in FIG.

Therefore, if the rotation speed of rotating the counter shaft 2 by the gear train 9, 10, 11 is faster than that of the input shaft 1, that is, if the motor shaft 5 is less than or equal to the rotation speed a, regardless of the rotation of the motor shaft 5. The power rotates the counter shaft 2 from the input shaft 1 through the gear trains 9, 10 and 11.

In this case, the motor-side one-way clutch 6 interposed between the boss inner diameter portion of the gear 7 fixed to the tip of the motor shaft 5 and the left end outer peripheral portion of the counter shaft 2,
The connection state between the motor shaft 5 and the counter shaft 2 is released so that the counter shaft 2 can be effectively rotated without hindering work even when the vehicle speed is low.

The gear 9 is fixed on the pump-side one-way clutch 8 which is interposed on the input shaft 1. The one-way clutch 6 on the motor side is interposed between the inner circumference of the gear 7 connected through the coupling 5a of the motor shaft 5 and the outer circumference of the right end of the counter shaft 2.

Therefore, when power is transmitted between the input shaft 1 and the counter shaft 2 via the HST transmission H, and when the gear trains 9, 10, 11 are connected.
There are two systems arranged side by side when power is transmitted via
When the rotational speed of the hydraulic motor M is lower than the rotational speed a of FIG. 2, the constant rotational speed of the input shaft 1 is transmitted via the gear trains 9, 10 and 11, and the rotational speed of the hydraulic motor M becomes the rotational speed a. When the above is reached, the hydraulic motor M rotation is continuously variable
It is transmitted to the O-axis 3.

Also, when the pump swash plate of the HST transmission H is changed in angle to rotate backward, the motor-side one-way clutch 6
In the case of reverse rotation, no engagement occurs, so that all is transmitted from the pump-side one-way clutch 8 through the gear trains 9, 10 and 11 at a constant low speed rotation.

When the rotation speed of the counter shaft 2 becomes faster than the predetermined rotation speed b of the motor shaft 5, the governor 17 of the pulley type transmission device starts to open due to the centrifugal force.

When the governor 17 is opened by centrifugal force, the split pulley 20 constituted by the fixed half pulley 20b and the sliding half pulley 20a is operated by the governor shifter 18,
The sliding side half pulley 20a opens toward the side that widens the pulley width against the spring 19.

By rotating the governor shifter 18 to the outside, the automatic transmission of the pulley type transmission is performed.

The split pulley 20 is constructed on the counter shaft 2, but the split pulley 21 that moves in the opposite direction is the PTO.
It is arranged on the shaft 3.

The PTO shaft 3 is used to drive a grain culm raising device when the present invention is implemented as a combine axle drive device.

The split pulley 21 is composed of a fixed half pulley 21b and a sliding half pulley 21a. When the belt 30 changes the tension by the split pulley 20, it slides against the spring 22 in accordance with this tension. The side half pulley 21a is slid, and the diameter of the pulley is changed by controlling the diameter of the split pulley 20 substantially in the opposite direction.

As described above, by installing the pulley type transmission between the counter shaft 2 and the PTO shaft 3, when the rotation speed of the hydraulic motor M becomes faster than the rotation speed b in FIG. 2, the rotation speed of the counter shaft 2 is changed. The split pulleys 20 and 21 operate to reduce the speed of transmission to the PTO shaft 3, and as shown in FIG. 2, the inclination angle of the graph showing the rotation speed of the PTO shaft 3 from the rotation speed b indicates the rotation speed of the motor shaft 5. It becomes gentler than the angle of the broken line shown. The degree of deceleration is arbitrarily set by the weight of the governor 17.

Further, in FIG. 1, the gear 7 is a gear fixedly mounted on the transmission shaft 15.
12 is in constant mesh with gears 14 and 16 on gearbox 15
The variable speed rotation is transmitted to the lower shaft to drive the axle finally.

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

Firstly, in the past, when the traveling speed became faster than a predetermined rotation speed b, the rotation speed of the PTO became faster in proportion to this rotation speed. There was a head loss such as shredding or catching, but in the case of implementing the present invention, when the number of rotations of the motor shaft 5 reaches a certain value or more, the speed is further reduced by the pulley type transmission. Since the rotation increase rate of the PTO shaft 3 is reduced, the above head loss can be reduced.

Secondly, when the HST type transmission H and the pulley type transmission are arranged side by side, when the present invention is applied to a combine, in either case the traveling speed is too low or the traveling speed is too high. Moreover, since the number of revolutions is not changed above and below a certain number of revolutions, the operator can work with peace of mind and without head loss.

[Brief description of drawings]

FIG. 1 is a side sectional view of a power take-out device for a working machine of the present invention, and FIG. 2 is a graph showing rotation of a PTO shaft controlled by the configuration of the present invention. H ... HST transmission, P ... hydraulic pump M ... hydraulic motor, 1 ... input shaft, 2 ... counter shaft, 3 ... PTO shaft, 4 ... pump shaft, 5 ... motor shaft, 6 ... motor Side one-way clutch, 8 …… Pump side one-way clutch 20,21 …… Split pulley, 9,10,11 …… Gear train

Claims (1)

[Scope of utility model registration request] 1. In an axle drive equipped with an HST transmission H, an input shaft 1 to which power from an engine is input and a pump shaft 4 are connected, and a pump side one-way clutch 8 is provided on the input shaft 1. If a motor-side one-way clutch 6 is interposed between the motor shaft 5 and the counter shaft 2 of the HST transmission H, and the motor shaft 5 is below a certain rotation, the input shaft 1 to the pump-side one-way A gear train 9, which transmits power directly to the counter shaft 2 via the clutch 8.
10 and 11 are installed between the pump side one-way clutch 8 and the counter shaft 2, and further between the PTO shaft 3 arranged in parallel with the counter shaft 2 by the rotation of the governor 17 when rotating at a certain speed or more, the pulley. A work machine power take-out device, characterized in that a pulley type transmission device for shifting the width to a deceleration side is interposed.