JPS61285127A - Power transmission gear for travelingly working vehicle - Google Patents

Abstract

PURPOSE:To improve safety and controllability in work by making a mower device, etc. a front mount type, in a travelingly working vehicle for mowing, etc. in which a working machine is provided in the front, and an output-shaft vertical type engine is provided in the rear, of a driver's seat. CONSTITUTION:Driving front wheels 10 and steering rear wheels 11 are provided in the front and rear parts of a machine body frame 17 respectively, on the rear part of which an output-shaft vertical type engine E is mounted. A mower device R as a working machine is vertically movably installed to the machine body frame 17, in front of the front wheel 10, via a link 7. A differential device 38 is provided in a traveling transmission gear 2 for driving a front axle 15, and is driven by a hydraulic motor 36 of an HST type transmission 2a having a hydraulic pump 35 and which is driven via a pulley 14. The pulley 14 is rotated by the power of the engine E via a belt, and a pump shaft 16 on which this pulley 14 is installed, is extended downward, to install an output pulley 5, which is connected to an input pulley 6 for the mower device R via a belt.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a power transmission device for mower tractors and the like for mowing lawns among traveling work vehicles.

(B) Prior Art Conventionally, small-sized tractors equipped with lawn mowers and the like for mowing lawns have been known. However, conventional mower tractors were mostly mid-mount type with the mower device attached to the underbelly of the tractor, and front-mount type mower tractors with the mower device placed at the front of the tractor were only large.

When mowing lawns using a front-mounted mower tractor, the operator must always pay close attention to the area below the rafter body, which can be tiring over long periods of time. Therefore, as a recent trend, front-mounted mower tractors for home use are desired. However, placing the engine at the front of the aircraft and the mower device also moves the center of gravity of the aircraft forward, resulting in poor balance.
If the engine is placed behind the driver's seat, the power transmission structure to the mower device at the front of the aircraft will be long and complicated, raising the vehicle height, and placing the power transmission device on the underside of the aircraft will make repairs and maintenance easier. There were problems such as poor serviceability such as inspections.

(C) Problems to be Solved by the Invention The object of the present invention is to configure a front-mount type household mower tractor, in which the mower device is disposed at the front of the machine body and is of the front-mount type. In order to balance this, the engine was placed behind the driver's seat, and the power transmission system from the engine to the front mower device was designed to avoid raising the vehicle height, and consisted mainly of pulleys and V-belts. In addition, in the case of a front row 1-type mower tractor, the front wheels are the driving wheels and the rear wheels are the steering wheels so that the mower device does not turn too sensitively in response to the steering of the tractor. be.

In addition, it is necessary to transmit power from the rear engine to both the front driving power transmission device and the mower device, and if this is configured into two systems, no matter how much belt transmission is used, the vehicle height will be reduced. Therefore, the V-belt from the engine to the driving power transmission device is shared, and from the pump shaft part of the H3T type transmission, which corresponds to the input shaft of the driving power transmission device, to the mower device drive In order to extract power, P
This is a configuration of the ro device.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

In a traveling working vehicle equipped with a working machine in front of a driver's seat 9 and an engine E with a vertical output shaft in the rear, a differential device 3 is installed in a traveling power transmission device 2 that drives a front axle 15.
8, and the differential device ff138 is connected to the pump shaft 1 in the vertical direction.
6, the pump shaft 16 is offset from the power transmission 2 for the traveling; ”
The moving crab from engine E extends from the moving device 2. 4 ears! t~kaf-IJ-4t-ff
ly7. □16CtM&t, the pump shaft 16 is further extended downward, and a PTO device for transmitting power to the working machine in front is constructed in an extension of the pump shaft 16.

Further, the PTO device is used as an output pulley 5, and power is transmitted to the drive section of the work machine via a V-belt.

In addition, the PTO device is connected to the bevel gear box 24 and the horizontal PT.
It consists of an O-shaft 40, and power is transmitted to the drive section of the working machine in front through a universal joint shaft 22.

Further, a clutch device is interposed between the pump shaft 16 and the PTO device.

Further, a clutch device and a speed reduction device are interposed between the pump shaft 16 and the PTO device.

(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. 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 an embodiment in which the engine E is arranged low, and Fig. 4 is a driving power transmission. 1 and 5 are side sectional views of the power transmission device for traveling, FIG. 6 is a front view of the power transmission device for traveling and the H3T37 type transmission, and FIG. 7 is the power transmission device for traveling. FIG. 2 is a plan view of an embodiment in which an HST type transmission 2a is separate from the main body of the vehicle and can be selectively rotated.

The inventions of Items 1 and 2 will be explained with reference to the drawings of FIGS. 1 to 7.

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 fuselage frame 17. The body frame 17 is supported by front wheels 10, 10 and rear wheels 11, 11. Front wheels 0 and 10 are driving wheels, and rear wheels 11 and 11 are steering wheels. A mower device R as a working machine is supported by a link 7 at the front of the rear wheels 10, 10 so as to be movable up and down by a hydraulic system. Even if the mower device R is raised and lowered by the hydraulic device, the power transmission device such as the V belt is not connected to the front wheels 10 and 1.
The power transmission device of the present invention is configured so as not to come into contact with the front axle 33 of No. 0.

A traveling power transmission device 2 is fixed to a part of the body frame 17, and front axles 15 of front wheels 10, 10 protrude from the traveling power transmission device 2 to the left and right. The case of the driving power transmission device 2 is constructed integrally with the front l-axle 33 of the axle 15, and is arranged in a T-shape. Furthermore, in order to arrange the HST type transmission 2a approximately at the center of the left and right sides of the aircraft body, it is bent into a hook shape and placed off-set. A differential device 38 is disposed within the driving power transmission device 2, and after the output of the H3T type transmission 2a is direction-changed by a hebel gear device, the differential rotation is applied to the front axle 15 by the differential device 38. In FIGS. 4 and 5, the HST type transmission mechanism is composed of a hydraulic motor 36 and a hydraulic pump 35, and the hydraulic pump 35 is driven by a pump shaft 16. The rotation after shifting in the HST type transmission mechanism is transmitted from the motor shaft 50 of the hydraulic motor 36 to the differential gear 38 via the hevel gear device.
Next, let me explain the power transmission structure.

The engine E has a crankshaft 26 which is a vertical output shaft.
It is a vertical type with a vertical crank shirt 1.
-26, the output pulley 3 is fixed. and,
Power is transmitted from the output pulley 3 to the input pulley 4 of the pump shaft 16 provided in the HST type transmission 2a of the power transmission device 2 for travel via a V-belt.

The power of the input pulley 4 is continuously variable by the H3T type transmission 2a, and then transmitted to the driving power transmission device 2 to drive the left and right front axles 15 via the bevel gear device/differential device 38. be.

The positional relationship between the H3T type transmission 2a and the driving power transmission device 2 is that the driving power transmission device 2 is fixedly installed slightly off the center of the left and right sides of the aircraft, and the engine is located at the center of the left and right sides of the aircraft. A V-belt that connects the E-H3T type transmission 2a and the mower device R and transmits the power is arranged. The traveling power transmission device 2 is arranged eccentrically to avoid the V-belt, and the H3T type transmission 2a is rotated from the traveling power transmission device 2 toward the left-right center of the aircraft body so that only the input pulley 4 is located in the center. It has a protruding structure on the mold.

With the H3T type transmission 2a and the driving power transmission device 2,
The rotation from the engine E, which has a vertical output shaft, is changed in speed and transmitted to the differential device 38. The pump shaft 16 passes through the H3T transmission 2a and protrudes downward, and the output pulley 5 is fixed to the downward protrusion. The protruding length of the pump shaft 16 is such that the V-belt from the output 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 pump shaft 16 is configured as an electromagnetic clutch device,
Steering power and working power can be simultaneously connected and disconnected by connecting and disconnecting the solenoid of the electromagnetic clutch device. Further, the downwardly protruding portion of the pump shaft 16 also serves as the PTO shaft. A V-belt is wound around the output pulley 5 and the input pulley 6 of the mower device R, and power is transmitted to the mower device R. Reference numeral 14 denotes a tension pulley of a heel tension pulley for the mower R.

The rotation of the tension pulley 14 connects and disconnects the power only to the mower device R.

In the embodiment shown in FIG. 3, an engine E with a vertical output shaft is fitted between the fuselage frames 17.
This is an example in which is placed low; in this case,
An input pulley 4 and an output pulley 5 are fixed to a portion of the lower side of the H3T type transmission 2a from which the pump shaft 16 protrudes. The sectional view in FIG. 7 shows the driving power transmission device 2 and H3.
This is an example where the T-type transmission 2a is configured separately,
(2) The JST type transmission 2a is selectively rotatable and is used to change the position of the pump shaft 16.

FIG. 8 is a side view of an embodiment of the horizontal PTO shaft 40 in item 3;
FIG. 9 is a front view of the driving power transmission device 2 and the HST type transmission 2a.

In this configuration, a bevel gear box 24 is fixedly installed on the lower surface of the HS 7 type transmission 2a to change the direction of rotation. That is, whereas the conventional PTO axis was a vertical axis, in the embodiment described in Section 3, the bevel gear box 24 makes the PTO axis 40 a horizontal axis, and the mower device R is It is input to the input bevel gear box 23. A clutch device 19 is interposed within the bevel gear box 24.

FIG. 13 is a side view of an embodiment in which a clutch device is interposed between the pump shaft 16 and the PTO device in Section 4, and FIG.
The figure also shows the driving power transmission device 2 and the H3T type transmission device 2.
FIG.

In this embodiment, the pump shaft 16 of the S7 type transmission 2a does not directly become the PTO shaft, but is connected to the PTO shaft below the clutch device 19 via the clutch device 19.
04i+1118 has been established. The output pulley 5 is fixed to the PTO shaft 18, and the input pulley 6 of the mower device R
Power is transmitted to the 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 the reduction gear and clutch device of item 5 are interposed; FIG. 11 is a front view of the driving power transmission device 2 and the HS 7 type transmission 2a; FIG. 12 is a sectional view of the reduction gear/clutch case 2.

In this embodiment, a work machine reduction/parallel case 21 is fixedly installed on the lower surface of the input section 2a.

Then, the rotation of the pump shaft I6 is further decelerated in the work machine deceleration/thalassochi case 21 and taken out to the PTO shaft 18. Further, a clutch device 19 is also installed inside the work machine reduction/column case 21. In addition, the reduction gear includes a sun gear 51, a planetary gear 52, and an internal gear 5.
It is configured as a planetary speed reduction device composed of 3 etc.

Figures 15 and 16 are drawings for comparison if the PT6 device was not removed from pump shaft [6] of H3T type transmission 2a. If necessary, the crankshaft 26 of the engine E with a vertical output shaft is further extended downward, and an output pulley 27 for the work machine is installed, and the two PTO shafts are connected 9, and the input turn-IJ for the extra work machine is installed. -28 is required, and two V-belts are required to be stretched, one above the other, so the vehicle height becomes higher than the structure of the present invention. Furthermore, the bearing device for the PTO shaft 29 also needs to be specially arranged, making the configuration complicated.

(f) Function The structure of the embodiment of the present invention is as described above, and the invention will now be described in detail.

The traveling drive of this traveling work vehicle is performed by the front wheels] 0 and 1 o.
The steering handle 20 controls the rear wheels 11 and 11.
This is done by The entire body is supported by the body frame 17, and power is transmitted from the engine E on the body frame 17 to the traveling transmission 2 and the mower device R. After shifting, the traveling transmission 2 drives the front axle 15 in the front axle 33 to drive and rotate the front wheels 10. The power to the mower device R is driven by the power that has entered the H3T type transmission 2a of the traveling power transmission device 2 and is transmitted again from the Yamakabu-U-5 to the input pulley 6 of the mower device R. be.

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

First, by configuring as in the present invention, the mower device can be a front-mounted type that is placed at the front of the tractor body, and by placing the mower device at the front,
The operator does not have to look under or behind the tractor, reducing fatigue. If this type of front mount was used, the center of gravity would shift to the front, resulting in poor balance, but this problem was resolved by placing the engine at the rear. Also, if the engine is placed at the rear, the mower device
The power transmission part to the driving power transmission device becomes complicated and the vehicle height becomes high, but by configuring it as in the present invention, the vehicle height is low and maintenance and inspection of the V-held etc. is easy. It is. In addition, if the mower device is front mounted and the front wheels are used as steering wheels, the mower device will slide on the grass when steering and will be damaged. This reduces the amount of hot water. In addition, as a result, the drive shaft becomes the front wheel and the engine becomes the rear V-bell I-, making power transmission complicated, but the power transmission device of the present invention also solves this problem.
It has been resolved.

Second, by arranging the traveling power transmission device 2 eccentrically from the left-right center of the machine body, the power transmission path from the engine E to the work equipment can be arranged so as to pass through the center of the machine body. This eliminates the need for unreasonable winding of belts, etc. in the transmission path.

Thirdly, since the vertical shaft type engine E is configured so that power can be transmitted to each part using a belt, it is possible to maintain sufficient minimum ground clearance even if the vehicle height is lowered, and the traveling work vehicle has a low center of gravity. This made it possible to create a stable configuration.
i

[Brief explanation of the drawing]

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 an embodiment in which the engine E is arranged low, and Fig. 4 is a traveling work vehicle. FIG. 5 is a side sectional view of the power transmission for driving, FIG. 6 is a front view of the transmission for driving and the HST type transmission, and FIG. 7 is a cross-sectional view of the power transmission for driving. 8 is a plan view of an embodiment in which the HST type transmission 2a is separate from the main body of the traveling transmission 2 and can be selectively rotated. FIG. The side view and FIG. 9 also show the driving power transmission device 2 and the HST type transmission device 2.
a front view, FIG. 10 is a side view showing an embodiment in which the reduction gear and clutch device of item 5 are interposed, and FIG. 11 is a portion of the driving power transmission device 2 and the HST type transmission 2a. , FIG. 12 is a sectional view of the reduction/tarassochi case 21, and FIG. 13 is a side view of an embodiment in which a clutch device is interposed between the pump shaft 16 and the PTO device in Section 4.
Figure 14 is a front view of the driving power transmission device 2 and the HST type transmission 2a, and Figures 15 and 16 are for comparison if the PTO device is not removed from the pump shaft 16 of the HST type transmission 2a. FIG. 2 is a side view and a top view of the tractor. E...Engine R...Mower device 2...Traveling power transmission device 2a...HST type transmission 3...Output pulley 4...Input pulley 5... ...Output pulley for the mower device 6...Input pulley for the mower device 10...Front wheel 15...Front axle 33...Front axle Applicant: Kanzaki Kogyoku Koki Seisakusho Co., Ltd. Agent Patent attorney Toshikazu Yano 1st Figure 7 So Unexamined Publication No. 11aG1-285127 (8)

Claims (5)

[Claims] (1) In a traveling work vehicle equipped with a working machine in front of the driver's seat 9 and an engine E with a vertical output shaft in the rear, a differential is installed in the traveling power transmission device 2 that drives the front axle 15. A device 38 is provided, and the differential device 38 is connected to a motor shaft 50 of the HST type transmission 2a having a vertical pump shaft 16.
The input pulley 4 that transmits the power from the engine E is driven by the HST type transmission 2a, which is extended from the drive power transmission device 2 so that the pump shaft 16 is offset with respect to the drive power transmission device 2, and the pump shaft 16 is offset from the drive power transmission device 2. A power transmission device for a traveling working vehicle characterized in that a PTO device is provided on a shaft 16 and further extends downward from the pump shaft 16 to transmit power to a working machine in front of the pump shaft 16. Device. (2) A power transmission device for a traveling work vehicle, characterized in that the PTO device according to claim 1 is used as an output pulley 5 to transmit power to a drive unit of a work machine via a V-belt. (3) The PTO device according to claim 1 is composed of a bevel gear box 24 and a horizontal PTO shaft 40,
A power transmission device for a traveling work vehicle, characterized in that power is transmitted to a drive unit of a front work machine through a universal joint shaft 22. (4) Pump shaft 16 and P according to claim 1
A power transmission device for a traveling work vehicle, characterized in that a clutch device is interposed between the TO device and the TO device. (5) Pump shaft 16 and P according to claim 1
A power transmission device for a traveling work vehicle, characterized in that a clutch device and a speed reduction device are interposed between a TO device.