JPH0150608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a power transmission device for a traveling work vehicle such as a mower tractor for mowing lawns.

(B) Prior Art Conventionally, as shown in FIGS. 17 and 18, a power transmission device for a traveling working vehicle in which the entire hydraulic continuously variable transmission is mounted on a transmission case has been known. There is.

Figures 17 and 18 show the hydraulic continuously variable transmission 2.
This figure shows a conventional technique in which the device A is placed on the transmission case 2 from the front.

In the case of this technology, it is necessary to use a hydraulic continuously variable transmission in which the input shaft 16 and the output shaft are arranged on the same axis, and the input shaft 16 must be connected to the transmission case 2 and the hydraulic transmission. Since it is necessary to arrange it above the overlapping part of the gear transmission 2a, the lowermost end of the transmission case 2 becomes low and there is a problem in that it is not possible to obtain a high ground clearance.

In addition, the bottom end of the input shaft 16 can be used for other work equipment.
Since it cannot be used as a PTO shaft, the crankshaft 26 of engine E with a vertical output shaft
It is necessary to extend further downward to provide an output pulley 27 for the working machine, and to tension two V-belts in the upper and lower positions, which also complicates the lower structure of the machine body.

Also, the output pulley 27 of the crankshaft 26
Therefore, since the distance between the input pulleys 6 of the mower device R becomes very long, it is necessary to specially arrange the relay shaft 29.

(C) Problems to be Solved by the Invention In the present invention, the hydraulic continuously variable transmission 2a is configured in a different-axis configuration in which the hydraulic pump and the hydraulic motor are arranged side by side on the left and right, and the lower end of the output shaft is connected to the transmission case. 2, but the lower part of the input shaft 16 is removed from the transmission case 2 and left free.
By making it possible to protrude vertically, the end of the input shaft 16 can be used as a PTO shaft for other operations.

(d) Means for solving the problem The object of the present invention is as described above, and the structure for achieving the object will be explained below. The lower surface of the continuously variable transmission 2a on the output shaft 50 side is placed on the upper surface of the transmission case 2, and the lower surface on the input shaft 16 side is arranged to protrude away from the transmission case 2. The lower end protrudes into the transmission case 2, and a bevel gear provided at the lower end meshes with a bevel gear inside the transmission case 2, and power is transmitted to the differential gear 38 via the reduction gear. The input pulley 4 protrudes from the input shaft 16 and is fixed to the input shaft 16 to transmit power from an engine equipped with a vertical crankshaft.

Further, the input pulley 4 is fixedly installed at a portion where the input shaft 16 projects upward from the hydraulic continuously variable transmission 2a.

Further, the input pulley 4 is fixedly installed at a portion where the input shaft 16 projects downward from the hydraulic continuously variable transmission 2a.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained. FIG. FIG. 2 is a side view of the entire fixed traveling work vehicle of the present invention, FIG. 3 is a side view of an embodiment in which the input pulley 4 is fixed to the downwardly projecting side of the input shaft 16, and FIG. 15 is also a plan view, FIG. 16 is a front view of the transmission case 2 and hydraulic continuously variable transmission 2a, FIG. 4 is a plan developed cross-sectional view of the power transmission device for traveling, and FIG. 5 is also the same for traveling. A side sectional view of the power transmission device, FIG. 6 is a front view of the power transmission device for traveling and the transmission portion, and FIG. FIG. 3 is a plan view of a freely movable embodiment.

This will be explained with reference to FIGS. 1 to 7, and FIGS. 15 and 16.

A body frame 17 is constructed over the entire length of the traveling work vehicle from the front to the rear. A steering handle 20, a driver's seat 9, and an engine E with a vertical output shaft are mounted on the body frame 17.

The fuselage frame 17 is connected to the front wheels 10, 10 and the rear wheel 1.
1 and 11. The front wheels 10, 10 are drive wheels, and the rear wheels 11, 11 are configured as steering wheels. A mower device R is supported by a hydraulic device on a link 7 at the front of the front wheels 10, 10 so as to be able to move up and down. A transmission case 2 is fixed to a part of the fuselage frame 17.

From the left and right of the differential device 38 disposed inside the transmission case 2, the front axles 15 of the front wheels 10,
15 is highlighted. The front axles 15, 15 are covered with a front axle 33.

As part of the transmission case 2, the differential device 3
An elongated power transmission section is provided below 8 and along one side in the longitudinal direction, and a case housing the transmission section is integrally constructed with the front axle 33 of the front axle 15. It is configured in a T-shape.

Furthermore, on the top of the mission case 2,
The output shaft 50 of the hydraulic continuously variable transmission 2a is mounted thereon. The hydraulic continuously variable transmission 2a changes speed between an input shaft 16 and an output shaft 50 that are juxtaposed left and right in the vertical direction with respect to the aircraft body.

An output shaft 50 is made to protrude from the lower surface of the case housing the hydraulic continuously variable transmission 2a, and the protruding portion of the output shaft 50 is inserted into a power transmission section of the transmission case 2 to transmit power.

The other input shaft 16 has a portion of the case housing the hydraulic continuously variable transmission 2a that supports the input shaft 16 fixed at a position protruding from the case of the transmission portion in the left-right direction. The upper and lower ends of the input shaft 16 protrude.

An input pulley 4 is attached to the upper and lower protrusions of the input shaft 16.
and PTO pulley 5 can be fixed.

4 and 5, a hydraulic continuously variable transmission 2a is illustrated, and the hydraulic continuously variable transmission 2a is illustrated.
A is composed of a hydraulic motor 36 and a hydraulic pump 35, and the hydraulic pump 35 is driven by an input shaft 16.

The rotation of the hydraulic motor 36 after shifting in the hydraulic continuously variable transmission 2a is transmitted to the differential device 38 by the output shaft 50 via the bevel gear device, the counter shaft 37, and the gear transmission section.

Next, to explain the power transmission part, engine E is connected to crankshaft 2, which is the output shaft.
The output pulley 3 is fixed to the vertical crankshaft 26. Then, from the output pulley 3 with a V belt,
Power is transmitted to an input pulley 4 provided at the tip of an input shaft 16 protruding from the case of the hydraulic continuously variable transmission 2a, thereby forming a power transmission section for traveling.

The input pulley 4 is powered by a hydraulic continuously variable transmission 2.
After the gear is changed at point a, the transmission is transmitted into the transmission case 2 and then transferred to the left and right front axles 1 via the bevel gear, counter shaft 37, gear transmission section, and differential device 38.
5 and 15.

Hydraulic continuously variable transmission 2a and transmission case 2
The transmission case 2 is fixedly installed slightly off the center of the left and right sides of the fuselage, and the crankshaft 26 of the engine E and the hydraulic continuously variable transmission 2a are located approximately in the center of the left and right sides of the fuselage. A V-belt is arranged to connect the input shaft 16 to the input shaft 16.

The transmission case 2 is arranged eccentrically to avoid the V-belt, and the input shaft 16 of the hydraulic continuously variable transmission 2a is directed from the transmission case 2 toward the left-right center of the machine so that the input pulley 4 is located approximately at the center. This makes the side of the tree stand out.

The input shaft 16 passes through the bottom of the case of the hydraulic continuously variable transmission 2a and projects downward, and the PTO pulley 5 is fixed to the downward protrusion. The protruding length of the input shaft 16 is set to such an extent that the V-belt from the PTO pulley 5 to the mower device R does not come into contact with the lower surface of the front axle 33 even when the mower device R is moved up and down.

In FIGS. 1 and 2, the input pulley 4 fixed to the input shaft 16 is directly configured as an electromagnetic clutch device, and traveling power and working power are simultaneously connected and disconnected by connecting and disconnecting the solenoid of the electromagnetic clutch device. be able to.

A V-belt is wound around the PTO pulley 5 and the input pulley 6 of the mower device R, forming a PTO system power transmission section, and engine power is transmitted to the mower device R.

14 is a tension pulley of a belt tension clutch device for mower device R. By rotating the tension pulley 14, only the mower device B is powered on and off.

In the embodiments shown in FIGS. 3, 15, and 16, an engine E with a vertical output shaft is fitted between the fuselage frame 17.
is placed low.

In this case, the input pulley 4 and the PTO pulley 5 are arranged side by side at the lower end of the input shaft 16 that protrudes from the exposed lower part of the case of the hydraulic continuously variable transmission 2a.

The plan view of FIG. 7 is an example of a case where the transmission case 2 and the hydraulic continuously variable transmission 2a are configured to be rotatable to change their positions.
a can be selectively rotated, and is used when adjusting the position of the input shaft 16.

FIG. 8 is a side view of an embodiment of the horizontal PTO shaft 40;
FIG. 9 is a front view of the transmission case 2 and the hydraulic continuously variable transmission 2a.

In this configuration, the input shaft 16 is made to protrude from the exposed bottom of the hydraulic continuously variable transmission 2a.
An output rotary body made of a bevel gear is fixedly installed at the lower end of the rotor, and the direction of rotation is changed by a bevel gear box 24.

That is, the horizontal PTO is controlled by the bevel gearbox 24.
The shaft 40 is used as a horizontal shaft and is inputted to the input bevel gear box 23 of the mower device R via the universal joint shaft 22.

Inside the bevel gear box 24 is a clutch device 1.
9 is interposed.

FIG. 13 shows a clutch device 1 at the lower end of the input shaft 16.
FIG. 14 is a side view of the embodiment in which the transmission case 9 is interposed, and FIG. 14 is a front view of the transmission case 2 and the hydraulic continuously variable transmission 2a.

In this embodiment, the hydraulic continuously variable transmission 2a
Instead of the input shaft 16 directly becoming the PTO axis,
Via the clutch device 19, the clutch device 19
A PTO shaft 18 is provided below. The PTO axis 1
A PTO pulley 5 is fixedly installed at 8, and power is transmitted to the input pulley 6 of the mower device R by a V-belt.
Therefore, there is no need for a belt tension clutch device, and power can be reliably connected and disconnected.

FIG. 10 is a side view showing an embodiment in which a reduction gear and a clutch device are interposed, FIG. 11 is a side view of the transmission case 2 and hydraulic continuously variable transmission 2a, and FIG. clutch case 2
1 is a sectional view of FIG.

In this embodiment, the hydraulic continuously variable transmission 2a
A work machine reduction/clutch case 21 is fixedly installed on the lower surface of the machine. In this configuration, the sun gear 51 is fixed to the protrusion at the lower end of the input shaft 16.

And a reduction/clutch case 21 for the work machine.
, the rotation of the input shaft 16 is further decelerated and taken out to the PTO shaft 18.

Further, a clutch device 19 is also installed inside the reduction/clutch case 21 for the work machine. The speed reduction device is configured as a planetary speed reduction device including a sun gear 51, a planetary gear 52, an internal gear 53, and the like.

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

First, the lower surface of the hydraulic continuously variable transmission 2a in which the input shaft 16 and the output shaft 50 are arranged vertically side by side is placed on the upper surface of the transmission case 2 on the output shaft 50 side, and the lower surface of the input shaft 16 side is placed on the upper surface of the transmission case 2. The lower end of the output shaft 50 protrudes into the transmission case 2, and the bevel gear provided at the lower end meshes with the bevel gear inside the transmission case 2, and the output shaft 50 is arranged to protrude outside the transmission case 2. The input shaft 16 is made to protrude in the vertical direction, and the power is transmitted from an engine equipped with a vertical crankshaft to the input pulley 4 fixedly attached to the input shaft 16. Since the continuously variable transmission 2a can be configured in such a way that the hydraulic motor 36 and the hydraulic pump 35 are arranged side by side, the position of the transmission case 2 can be lowered even when the two are mounted on the transmission case 2 in duplicate. This made it possible to maintain a high minimum ground clearance.

In addition, an input pulley 4 is attached to the upper protrusion of the input shaft 16.
Even when the input pulley 4 is attached, the position of the input pulley 4 can be brought as close to the upper surface of the transmission case 2 as possible, and the space in the abdomen of the traveling work vehicle can be made more spacious.

Second, since the input pulley 4 is fixedly installed at the part where the input shaft 16 projects upward from the hydraulic continuously variable transmission 2a, the PTO is attached to the downward projecting end of the input shaft 16.
This makes it possible to attach a pulley 5, an electromagnetic clutch device, etc.

Thirdly, since the input pulley 4 is fixed to the part where the input shaft 16 protrudes downward from the hydraulic continuously variable transmission 2a, the position of the input pulley 4 is on the side of the transmission case 2. This allows the transmission case 2 to be placed higher or the engine E to be placed lower, making it possible to bring the heights of the transmission case 2 and engine E closer together.

[Brief explanation of drawings]

FIG. 1 is an overall plan view of the traveling working vehicle of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a side view of another embodiment, and FIG. 4 is a developed cross-sectional plan view of a traveling power transmission device. Figure 5 is a side sectional view of the power transmission device for traveling, Figure 6 is a front view of the power transmission device for traveling and the transmission part, and Figure 7 is a hydraulic stepless stepless view of the power transmission device for traveling. A plan view of an embodiment in which the transmission 2a is separate and selectively rotatable. FIG. 8 is a horizontal view.
FIG. 9 is a side view of an embodiment of the PTO shaft 40, FIG. 9 is a front view of the transmission case 2 and hydraulic continuously variable transmission 2a, and FIG. 10 is an embodiment in which a reduction gear and a clutch device are interposed. 11 is a side view of the transmission case 2 and the hydraulic continuously variable transmission 2a, FIG. 12 is a sectional view of the reduction/clutch case 21, and FIG. 13 is a side view of the transmission case 2 and the hydraulic continuously variable transmission 2a. 14 is a front view of the transmission case 2 and the hydraulic continuously variable transmission 2a, FIG. 15 is a plan view of the embodiment shown in FIG. 3, and FIG. The figure is a front view of the transmission case 2 and the hydraulic continuously variable transmission 2a, and FIGS. 17 and 18 are a side view and a plan view of the prior art. E...engine, R...mower device, 2...mission case, 2a...hydraulic continuously variable transmission, 3
...Output pulley, 4...Input pulley, 5...
Output pulley, 6... Input pulley for mower device, 15... Front axle, 16... Input shaft, 50...
output shaft.

Claims (1)

[Claims] 1. The lower surface of the output shaft 50 side of the hydraulic continuously variable transmission 2a, which is arranged adjacent to each other with the input shaft 16 and the output shaft 50 being vertical axes, is placed on the upper surface of the transmission case 2, and the input shaft The lower surface of the output shaft 50 on the 16 side protrudes away from the mission case 2, the lower end of the output shaft 50 protrudes into the mission case 2, and a bevel gear provided at the lower end meshes with a bevel gear inside the mission case 2. , an input pulley 4 that transmits power to the differential device 38 via a reduction gear, the input shaft 16 protrudes upward or downward, or both, and is fixedly attached to the input shaft 16;
The power of a traveling work vehicle is characterized in that the output pulley 3 fixedly installed on the vertical crankshaft 26 of the engine E is placed in the same horizontal position, and a V-belt is wound directly between the output pulley 3 and the input pulley 4 to transmit power. transmission device. 2 Input pulley 4 according to claim 1
A power transmission device for a traveling work vehicle, characterized in that an input shaft 16 is fixed to a portion projecting upward from a hydraulic continuously variable transmission device 2a. 3 Input pulley 4 according to claim 1
A power transmission device for a traveling work vehicle, characterized in that an input shaft 16 is fixedly installed at a portion projecting downward from a hydraulic continuously variable transmission device 2a.