JPH0750273Y2 - Power take-off device for traveling vehicle - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a technique of providing a mid PTO shaft and a rear PTO shaft for driving a working machine in a traveling vehicle equipped with an HST type transmission.

(B) Conventional Technology It has been conventionally known that, in an axle drive device for a traveling vehicle, an HST type transmission device is attached to a side surface of an axle drive case.

For example, it is as in Japanese Utility Model Publication No. 62-44198.

(C) Problems to be solved by the present invention The present invention is added to the axle drive device to take out the mid PTO shaft and the rear PTO shaft from the front and rear stages of the pump shaft of the HST transmission, and drive the working machine. It was possible.

Further, an electromagnetic clutch device is provided between the pump shaft and the mid PTO shaft and the rear PTO shaft to facilitate the operation of the operator.

(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.

According to the first aspect, the HST transmission H having the hydraulic motor M and the hydraulic pump P arranged therein is horizontally arranged so that the hydraulic motor M and the hydraulic pump P are arranged side by side when viewed from the front of the machine body. An axle supported by the axle drive case 5 from the motor shaft 7 by fixing the axle drive case 5 to the rear surface of the HST transmission H at the portion where the motor shaft 7 of the hydraulic motor M projects rearward from the HST transmission H. 4, the pump shaft 6 of the hydraulic pump P connects the front projecting portion of the HST transmission H to the input shaft 1 from the engine, and the pump shaft 6 is rearward of the HST transmission H. The rear PTO shaft 2 is continuously connected to the projecting portion via the clutch device B, and the mid PTO take-out pulley 11 is fixedly provided on the projecting portion of the pump shaft 6 in front of the HST transmission H. Mid PTO shaft supported by axle drive case 5 at the bottom of 6 The clutch device A above was power transmission by belt from the mid-PTO takeoff pulley 11.

In the second aspect, both of the clutch devices A and B are electromagnetic clutch type.

(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 perspective view showing a state in which support brackets 8a, 9a for the mid PTO shaft 3 are attached in front of the axle drive case 5, and FIG. 2 is a PTO.
FIG. 3 is a block diagram showing a control structure for connecting and disconnecting the rear PTO shaft 2 and the mid PTO shaft 3 by operating the lever 10, FIG. 3 is a side sectional view of a power take-off device for a traveling vehicle of the present invention, and FIG.
FIG. 5 is a sectional view taken along the line XX in FIG. 5, and FIG. 5 is an overall side view of a vehicle equipped with the power takeoff device of the present invention.

This will be described with reference to FIG.

At the front of the driver's seat of the traveling vehicle, a PTO lever 10 is arranged for the operator to operate.

When working with the mid PTO shaft 3, connect the electromagnetic clutch device A only, and when driving the work machine with the rear PTO shaft 2, connect the electromagnetic clutch device B. When working equipment is driven by both PTO shaft 3 and rear PTO shaft 2, electromagnetic clutch A and electromagnetic clutch B are used.
Both of the connection operations are performed through the control circuit 24 by switching the selection switch 25 by the rotation of the PTO lever 10.

In FIG. 2, the mid PTO shaft 3 is arranged as a shaft parallel to the pump shaft 6 of the HST transmission H from the bottom of the machine body.

In order to dispose the mid PTO shaft 3, supporting brackets 8a and 9a are provided on the front part of the axle drive case 5 to support the mid PTO shaft 3 by bearings.

The support bracket 8a is fixed to the front surface of the axle drive case 5,
The bearing device 8 for the mid PTO shaft 3 is supported. Further, the support bracket 9a projects forward from the support bracket 8a, and the bearing device 9 is fixedly installed. The mid PTO is located at the position between the support brackets 9a having the U-shaped cross section.
The shaft 3 and the electromagnetic clutch device A are arranged.

Next, the configurations of the HST transmission H and the axle drive case 5 will be described with reference to FIGS. 3 and 4.

The rotation of the engine is transmitted from the engine E to the input shaft 1. At the rear end of the input shaft 1, a mid PTO take-out pulley 1
1 is fixed, the mid PTO take-out pulley 11 serves as a coupling, and the pump shaft 6 of the HST transmission H is connected to the input shaft 1.

As shown in FIG. 4, the HST transmission H is of a two-shaft type in which a hydraulic motor M is arranged on the right side in the traveling direction and a pump is arranged on the left side. The upper end of the axle drive case 5 is fixed to the rear surface of the case of the HST transmission H so as to cover the protruding portion of the axle drive case 7.

Further, the axle drive case 5 is extended to project the bearing portion of the canter shaft 14, and the rear cover 5c of the axle drive case 5 is formed.
The counter shaft 14 and the electromagnetic clutch device B are bearing-supported in the bearing portion formed by the extension portion of the.

The front end of the rear PTO shaft 2 is supported by a bearing that is loosely fitted to the rear end of the counter shaft 14, and when the electromagnetic clutch device B is connected, the rear PTO shaft 2 is integrated with the pump shaft 6 via the counter shaft 14.

The axle drive case 5 is composed of a case body 5b, a rear lid body 5c and a front lid body 5a.
The a and 9a are fixed to the front surface of the front lid body 5a.

The front lid 5a, the case body 5b, and the rear lid 5c that form the axle drive case 5 are each made of aluminum die casting, and the left and right axles 4 are attached to the joint portion of the front lid 5a and the case body 5b. 4 and the differential gear device are supported by bearings, and between the case main body 5b and the rear lid 5c, a bevel gear shaft 16 and two other reduction shafts are supported by bearings. .

The motor shaft 7 protruding from the hydraulic motor M of the HST type transmission H has a bevel gear at the rear end protruding into the axle drive case 5.
15 is fixed, and a bevel gear 17 on a bevel gear shaft 16 is meshed with the bevel gear 15.

Further, a small-diameter gear 18 on the bevel gear shaft 16 meshes with a gear 19 on the lower shaft, and the gear 19 is a large-diameter gear 20 on the lower shaft.
The small diameter gear 21 on the shaft meshes with the differential ring gear 22 of the differential gear device on the axle 4.

The left and right axles 4, 4 are rotated by the differential rotation of the differential gear device formed by the differential ring gear 22.

In the present invention, the pump shaft 6 in front of the HST transmission H is used.
The belt 13 is wound around the mid-PTO take-out pulley 11 fixedly mounted on the mid-PTO shaft 3, and the pulley 12 loosely fitted on the mid-PTO shaft 3 is driven.

Then, the electromagnetic clutch device A is interposed between the pulley 13 and the mid PTO shaft 3.

Furthermore, the rear PTO shaft 2 is configured via the electromagnetic clutch device B on the pump shaft 6 projecting rearward of the HST transmission device H.

Therefore, by operating the PTO lever 10, the electromagnetic clutch device A and the electromagnetic clutch device B are connected, and the rotation of the input shaft 1 is transmitted to the mid PTO shaft 3 and the rear PTO shaft 2.

Further, since the pump shaft 6 is rotated by the number of revolutions of the engine irrespective of the gear shifting operation of the HST type transmission device H, it is possible to obtain working machine driving power with good power transmission efficiency.

FIG. 5 is an external view of a traveling vehicle equipped with the present invention.

The axle drive case 5 has a pair of left and right mounting frames 23, 24
Is provided and is supported by the frame F of the machine. The machine frame F supports the engine E in front of it.

Further, a universal joint connection portion 25 is arranged at the end of the mid PTO shaft 3 supported by the support brackets 8a and 9a, and the gearbox of the rotary mower R supported on the abdomen of the machine body so as to be able to move up and down.
A universal joint connection portion 27 is also arranged at the input end of 28, and both are connected by a transmission shaft 26.

Reference numeral 29 is an operation lever for shifting the HST transmission H.

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

First, although the HST transmission H is arranged in the front stage of the axle drive case 5, the HST transmission H is arranged horizontally so that the mid PTO shaft 3 and the rear PTO shaft 2 are clutched. Since it can be easily arranged with the devices A and B, various working machines such as an abdominal working machine and a rear working machine can be attached to the vehicle.

Secondly, the electromagnetic clutch device is interposed in the middle of both the mid PTO shaft 3 and the rear PTO shaft 2. Therefore, by switching the electromagnetic clutch device, the operation of the PTO lever 10 allows a simple electric circuit to operate. The PTO axis 3 and the rear PTO axis 2 can be operated intermittently, and both the rear PTO axis 2 and the mid PTO axis 3 can be connected and operated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which support brackets 8a, 9a for the mid PTO shaft 3 are attached in front of the axle drive case 5, and FIG. 2 is a PTO.
FIG. 3 is a block diagram showing a control structure for connecting and disconnecting the rear PTO shaft 2 and the mid PTO shaft 3 by operating the lever 10, FIG. 3 is a side sectional view of a power take-off device for a traveling vehicle of the present invention, and FIG.
FIG. 5 is a sectional view taken along the line XX in FIG. 5, and FIG. 5 is an overall side view of a vehicle equipped with the power takeoff device of the present invention. A, B …… Electromagnetic clutch device 1 …… Input shaft 2 …… Rear PTO shaft 3 …… Mid PTO shaft 4 …… Axle 5 …… Axle drive case

Claims (2)

[Scope of utility model registration request] 1. An HST transmission H having a hydraulic motor M and a hydraulic pump P disposed inside is horizontally arranged so that the hydraulic motor M and the hydraulic pump P are disposed side by side when viewed from the front of the machine body. The axle 4 is fixed to the rear surface of the HST transmission H in the portion where the motor shaft 7 of the motor M projects rearward from the HST transmission H, and the axle 4 supported by the axle drive case 5 is supported by the motor shaft 7. To the input shaft 1 from the engine, and the pump shaft 6 of the hydraulic pump P projects to the rear of the HST transmission H. The rear PTO shaft 2 is continuously connected to the above portion via the clutch device B, and the mid PTO take-out pulley 11 is provided at the portion where the pump shaft 6 projects forward of the HST transmission H.
Is fixedly installed, and power is transmitted by a belt from the mid PTO take-out pulley 11 to the clutch device A on the mid PTO shaft 3 supported by the axle drive case 5 in the lower stage of the pump shaft 6. Power takeoff device. 2. A power take-off device for a traveling vehicle, characterized in that both of the clutch devices A and B according to claim 1 of the utility model registration are electromagnetic clutch type.