JPH071541Y2 - Power take-off device for work vehicle - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention is applied to a mission device used as a traveling transmission,
It is related to the technology with a PTO shaft attached.

(B) Conventional technology It has been well known that a PTO shaft is placed side by side in a combine mission case in an agricultural machine to take out the PTO rotation synchronized with the axle.

(C) Problems to be solved by the invention The rotation direction of the PTO shaft varies depending on the form of the working machine, and when the rotation is in the same direction as the motor shaft of the HST type transmission, Japanese Patent Laid-Open No. 61- As shown in Japanese Patent No. 228164, the end of the motor shaft can be directly projected to the outside to form a PTO shaft.
Like No. 851203, an idle gear is interposed between the motor shaft and the sub-transmission shaft, and the protruding end of the sub-transmission shaft is configured as the PTO shaft.

When rotating in the direction opposite to the motor shaft, the method disclosed in JP-A-61-2638
Like No. 34, the motor shaft is gear-transmitted to the auxiliary transmission shaft without interposing an idle gear, and the auxiliary transmission shaft is used as the PTO shaft.

Therefore, to change the rotation direction of the PTO axis, at least 2
We had to make transmissions with different shaft arrangements and different numbers of shafts.

The PTO shaft needs a one-way clutch to stop the rotation when the axle rotates in the reverse direction.However, if the lubricating oil is not sufficiently transmitted to the one-way clutch, the PTO shaft rotates in the reverse direction. In some cases, abnormal wear may occur when the one-way clutch idles, or normal engagement may not be obtained if foreign matter is mixed in the lubricating oil.

(D) Means for Solving the Problem The first object of the present invention is to enable the rotation direction of the PTO shaft to be selected simply by exchanging gears without changing the shaft arrangement and the number of shafts of the transmission. , The second purpose
The purpose is to prevent idling wear and abnormal engagement of the one-way clutch interposed on the PTO shaft. Next, the configuration for achieving the object will be described.

From the output gear of the transmission H, the shift shaft 14, the shift driven shaft 15,
Mission case 1 for transmitting power to steering shaft 16 and axle 18
In addition, in the configuration in which the PTO shaft 5 that takes out rotation synchronized with the axle 18 is arranged side by side, a side view 3 is provided between the transmission shaft 14 and the PTO shaft 5.
A shifter shaft 13 for gear shift operation is arranged so as to form a rectangular shape, and the gear 8 on the gear shift shaft 14 is more than the gear 4 on the PTO shaft 5.
The idle gear 2 for driving the motor is detachably fitted on the shifter shaft 13.

Further, the transmission H is an HST transmission, the drain oil of the HST transmission H is introduced into the end of the PTO shaft 5, and the one-way clutch 3 interposed between the PTO shaft 5 and the gear 4 is installed. It is lubricated.

(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.

1 is a rear sectional view of a transmission case 1, FIG. 2 is a rear sectional view of a power transmission system from a hydraulic motor shaft 9 to a PTO shaft 5, FIG. 3 is a rear sectional view of an auxiliary transmission portion, and FIG. Is
FIG. 5 is a side view of the mission case 1, and FIG. 5 is a sectional view showing a lubrication mechanism of the PTO shaft 5 and the one-way clutch 3.

The overall structure of the mission case 1 will be described with reference to FIG.

The mission case 1 is composed of left and right half cases 1L and 1R. An HST type transmission H is attached to the right side surface of the right half case 1R.

The HST type transmission H is composed of a hydraulic pump, a hydraulic motor and a charge pump CP, the charge pump CP and the hydraulic pump are arranged on a pump shaft 12, and the other end of the pump shaft 12 is an HST type transmission. Another power take-off pulley 6 is attached to project from H.

Further, the bearing case 10 of the pump shaft 12 can be fitted into the positioning hole 1a of the right half case 1R, and the positioning similar to that of a knock pin can be performed between the bearing case 10 and the positioning hole 1a. Since the bearing case 10 and the positioning hole 1a constitute a positioning device, the HST transmission device H can be easily assembled to the mission case 1.

In the right half-split case 1R, an oil sump 1e is formed in the portion of the mounting surface of the charge pump CP, and a suction oil passage 1c and a combination oil passage 1b communicating with the oil sump 1e are formed.

The mating oil passage 1b is a left and right half-split case 1L as shown in FIG.
An oil passage is formed on the joint surface of 1R, and lubricating oil is sucked as operating oil from the oil filter 35 that is also fitted on the mating surfaces of the left and right half-split cases, and the mating oil passage 1b and suction oil passage 1c are connected. After that, the oil is supplied to the oil sump 1e, and suction pressure oil is supplied from the suction hole of the charge pump CP opened toward the oil sump 1e to be supplied to the HST transmission H.

The inner end of the input shaft 11 supported by the left half case 1L is engaged with the pump shaft 12 by spline fitting.
The hydraulic pump of the HST transmission H is driven by the pump shaft 12.

The rotation of the hydraulic motor of the HST transmission H is transmitted to the hydraulic motor shaft 9, and the hydraulic motor shaft 9 transmits power again to the transmission case 1.

The fixed gear 8 on the hydraulic motor shaft 9 meshes with the fixed gear 7 on the transmission shaft 14 to drive the transmission gears 20, 21 and 22 on the transmission shaft 14.

The transmission gears 20, 21, 22 and fixed gears 23, 24 on the driven shaft 15
・ Selectively mesh with 25 to obtain 3 sub gears.

The fixed gear 24 on the driven shaft 15 meshes with the large-diameter gear 26 on the steering shaft 16, and the left and right clutch slide gears 27, 27 are selectively selected as the steering gears on both the left and right sides of the large-diameter gear 26. Can be engaged with.

The clutch slide gears 27, 27 also serve as a steering brake body.

The clutch slide gears 27, 27 mesh with the large diameter gears 29, 29 on the counter shaft 17, and the small diameter gears on the counter shaft 17
28 · 28 meshes with the final gear 30 · 30 on the axle 18 · 18 and drives the axle 18.

FIG. 3 shows an enlarged view of the shifter shaft 13 and the high-, middle-, and low-speed sub-transmission devices formed on the transmission shaft 14 and the driven shaft 15 in an enlarged manner. 20, 21, 22
Among them, the shifter 19 slides on the double sliding gears 21 and 22,
The shifter 19 is supported by the shifter shaft 13.

On the shifter shaft 13, an idle gear 2 for transmitting power from the hydraulic motor shaft 9 to the PTO 5 is interposed, as shown in FIG.

The idle gear 2 is composed of a large-diameter gear 2a and a small-diameter gear 2b. The large-diameter gear 2a is a fixed gear 7 on the transmission shaft 14.
The other small-diameter gear 2b meshes with the PTO gear 4 on the PTO shaft 5.

The hydraulic motor shaft 9 performs both forward rotation and reverse rotation. However, since the PTO shaft 5 is power for rotating the working machine, only rotation in one direction is necessary and reverse rotation is not possible. Since it is necessary, the one-way clutch 3 is interposed in the bearing portion of the PTO 4 so that the reverse rotation of the PTO gear 4 is not transmitted to the PTO shaft 5.

Then, the one-way clutch 3 needs to idle without frictional resistance without engaging the PTO gear 4 and the PTO shaft 5 during the reverse rotation, and only during the forward rotation, the PTO gear 4 and the PTO shaft 5 do not rotate.
The rotation of the one-way clutch 3 is abnormally worn if the lubricating oil is not sufficiently supplied during the idling.

In the present invention, the drain oil of the HST type transmission H is constantly supplied to the end of the PTO shaft 5 by the lubricating oil feed pipe 33 and the joint 34 so that abnormal wear does not occur when the one-way clutch 3 idles. I am doing it.

Further, since the lubricating oil to be supplied is the drain oil of the working oil of the HST type transmission that has been cleaned through the oil filter and the line filter, there is almost no foreign matter mixed in and the abnormal engagement of the one-way clutch 3 is prevented. .

Referring to FIG. 5 and FIG.

The hydraulic motor shaft 9, the shifter shaft 13, and the PTO shaft 5 are
The idler gear 2 is mounted on the shifter shaft 13 by interposing the shifter shaft 13 between the speed change shaft 14 and the PTO shaft 5 so as to form a triangular shape in a side view. Rotate the PTO shaft 5 in one direction (Fig. 5) or remove the idle gear 2 and directly attach the PTO gear 4 to the fixed gear 7.
Can be engaged to rotate the PTO shaft in the other direction (Fig. 6)
You can choose to.

At this time, it goes without saying that the one-way clutch 3 is installed in the reverse direction.

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

As described in claim (1), the transmission case 1 transmitting power from the output gear of the transmission H to the transmission shaft 14, the transmission driven shaft 15, the steering shaft 16, and the axle 18 takes out rotation synchronized with the axle 18. In a configuration in which the PTO shaft 5 is juxtaposed, a shifter shaft 13 for gear shift operation is arranged between the speed change shaft 14 and the PTO shaft 5 so as to form a triangular shape in side view, and the gear on the speed change shaft 14 causes the PT
The idle gear that drives the gear on the O-axis 5 is the shifter shaft 13
Since it is removably fitted on the shaft, the shifter shaft 13 can also be used as an idle shaft, which makes it possible to manufacture at low cost without the need to attach an additional idle shaft. Is.

When the PTO shaft needs to rotate in the opposite direction, the idle gear 2 on the shifter shaft 13 is removed and the fixed gear 7 on the transmission shaft 14 is directly connected to the idle gear 2 on the PTO shaft 5. By engaging with, the reverse rotation can be easily obtained without the shifter shaft 13 interfering.

Therefore, since the rotation direction of the PTO shaft can be selected by simply changing the gears, only one type of transmission is required and the manufacturing cost can be greatly reduced.

Since the transmission H is an HST transmission and the drain oil of the HST transmission H is introduced at the end of the PTO shaft 5 as in claim (2), the rollers are idly worn at the one-way clutch 3. It was possible to solve the problem.

Further, since the drain oil after being used in the HST type transmission H is used as the lubricating oil, foreign matter such as metal powder is much less mixed than the lubricating oil staying in the mission case. It is possible to eliminate abnormal engagement of the one-way clutch and improve its durability.

[Brief description of drawings]

1 is a rear sectional view of a transmission case 1, FIG. 2 is a rear sectional view of a power transmission system from a hydraulic motor shaft 9 to a PTO shaft 5, FIG. 3 is a rear sectional view of an auxiliary transmission portion, and FIG. Is
Sectional views showing the lubrication mechanism of the PTO shaft 5 and the one-way clutch 3, FIG. 5, and FIG. 6 are side views of the mission case 1. 1 ... Mission case 2 ... Idle gear 3 ... One-way clutch 4 ... PTO gear 7 ... Fixed gear 9 ... Hydraulic motor shaft 13 ... Shifter shaft

Claims (2)

[Scope of utility model registration request] 1. A PTO for extracting rotation synchronized with an axle 18 to a transmission case 1 that transmits power from an output gear of a transmission H to a transmission shaft 14, a transmission driven shaft 15, a steering shaft 16 and an axle 18.
In a configuration in which the shafts 5 are arranged side by side, a shifter shaft 13 for gear shifting operation is arranged so as to form a triangular shape in a side view between the gear shifting shaft 14 and the PTO shaft 5, and the gear 8 on the gear shifting shaft 14 causes the PTO Shift the idle gear 2 that drives the gear 4 on the shaft 5 to the shifter shaft 13
A power take-out device for a work vehicle, which is detachably fitted on the upper part. 2. The transmission H according to claim 1 is an HST type transmission, and the drain oil of the HST type transmission H is introduced into the end portion of the PTO shaft 5 so as to connect the PTO shaft 5 and the gear 4. A power take-out device for a work vehicle, characterized in that a one-way clutch 3 interposed between the two is lubricated.