JPH11115514A - Driving gear for passenger control work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lift range from being limited in a work machine, and prevent a kind from being limited of the work machine mounted in a take out direction of PTO of the work machine, in a four-wheeled passenger control work vehicle provided with a machine body frame in a longitudinal direction to support two front wheels in a front part of the machine body frame and two rear wheels in a rear part to be suspension provided by using a work machine mounting device. SOLUTION: This constitution is formed such that through a second drive shaft 91 provided in two chains 215, 207 and a front part frame, front wheel drive force output from a transmission makes a detour in the upward of a lift range of a work machine, so as to be input to a front differential case 220. In this constitution, a front PTO shaft 216 is directly connected to a transmitting shaft 213, to be provided in the forward/backward, and an output from the both can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving technique for a riding work management machine.

[0002]

2. Description of the Related Art Conventionally, in a passenger management work vehicle, a driving force output from a transmission is input to a front differential case from a front drive shaft directly or through a single chain. In addition, the front wheel of the work management machine is configured to be large in order to secure a lifting range of the work machine when the work machine is mounted on the abdomen between the front and rear wheels. Further, a PTO shaft for outputting power for driving the working machine is protruded from a transmission case arranged at a rear portion of the management work vehicle, and is attached to an abdomen of the management work vehicle by a PTO shaft extending forward from rear. It is configured to be able to be connected to the working machine. Further, the output of the PTO shaft is only linked to the engine output without passing through the transmission.

[0003]

When a work machine is mounted on the abdomen of a management work vehicle and power is also transmitted to the front wheels, the range of movement of the work machine is limited because the front drive shaft passes through the range of movement of the work machine. Was. Also, even if the front wheels are made large and the height of the front frame above the ground is raised, the radius of the front wheels is large, so the rear of the front wheels spreads to the middle abdomen of the work machine. The longitudinal length of the mechanism, the lifting range, and the lifting height are limited. In addition, since the direction of taking out the PTO is only one direction, the type of the working machine to be attached is limited because the working machine can only be adjusted to the direction of taking out the PTO.

[0004]

Next, in order to solve the problem, an airframe is provided in the front-rear direction, two front wheels are supported at a front portion of the airframe, and two rear wheels are supported at a rear portion. This is a passenger management work vehicle in which a working machine is mounted on an abdomen between front and rear wheels of a four-wheel riding management work vehicle via a work machine mounting device, wherein a body frame is divided into a front frame and a rear frame. The chain case is vertically fixed to the front and rear of the front frame so as to transmit power to a front wheel drive shaft provided in the front frame. Further, the transmission shafts supported at the lower part of the chain case are respectively extended to the abdomen side to form PTO shafts, so that output is possible in either front or rear.

[0005]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is an overall side view of a riding management work vehicle with a middle tillage mounted on the abdomen, FIG. 2 is an overall plan view of a riding management work vehicle with a middle tillage mounted on the abdomen, and FIG. FIG. 4 is a partial side sectional view of a frame showing a power transmission mechanism, FIG. 5 is a partial side sectional view of a frame showing a power transmission mechanism, and FIG. FIG. 3 is a partial cross-sectional side view of a power transmission shaft showing a power transmission mechanism.

Referring to FIGS. 1 and 2, the overall structure of a four-wheeled riding management work vehicle 71 will be described. The four-wheeled riding management work vehicle 71 has a driving unit 72 disposed at the rear of the body frame 1 that is long in the front-rear direction.
3 is mounted, the traveling speed is changed by the transmission case 74, and the rear wheel drive case 5.
, The rear wheels 3 are driven. On the other hand, the first power transmission shaft 9 is inserted through the inside of the body frame 1 (FIGS. 4 and 5), a front case 7 is provided in the front part of the body frame 1, and left and right sides of the side of the front case 7 are set with the vertical axis as the axis. A front wheel drive case 8 is rotatably mounted, and the front wheel 2 is supported by the front wheel drive case 8 so that the front wheel 2 can be driven to form a four-wheel drive vehicle. The engine 73 is covered by the bonnet 10, and a vehicle body cover 11 covering the transmission case 74 and the rear wheel 3 is disposed in front of the bonnet 10.
A driver's seat 12 is placed on the vehicle body cover 11, and the driver's seat 1
The traveling speed change lever 47 and the parking lever 39 protrude from two sides. A steering column 13 is provided upright on the body frame 1 in front of the driver's seat 12. A steering handle 14 projects above the steering column 13, an accelerator lever 15 projects from the right side of the steering column 13, and a main clutch 16
Is arranged.

Further, the front wheel 2 of the riding management work vehicle 71
A work implement 75 is suspended by a work implement mounting device 79 on the abdomen located between the rear wheel 3 and the work. The work implement mounting device 79 includes a bracket 18 protruding from the front frame 101.
And an upper link 19 and a lower link 20 connected to the motor, and an elevating cylinder 22. The hitch 21 of the working machine 75 is pivotally attached to the other end of the working machine mounting device 79, and a bar-shaped toolbar 23 extends in the left-right direction on the hitch 21, and a central portion is fixedly provided. At the center and the left and right sides of the toolbar 23,
A plurality of working machines 75 are mounted so that the mounting position can be changed,
It is possible to perform multiple management tasks. As the working machine 75, a rotary tiller, a rake-shaped rake for removing weeds, and the like can be arranged. In this embodiment, a rotary tiller is mounted.

Next, the body frame 1 will be described with reference to FIGS. 1, 2 and 4. FIG. The body frame 1
Is formed in the front frame 101 and the rear frame 102 in a step shape at a substantially central position in the front and rear direction in which the steering column 13 is erected, and is formed in a cylindrical shape long in the front and rear direction. Engine frames 103 are fixed to the ends.

The engine frames 103, 103
Two engine frames 103 are fixed to the left and right of the upper rear end of the rear frame 102, and the engine 7
The vehicle body cover 11 is mounted on the front of the engine frames 103, 103, and the transmission case 74 and the rear wheel 3 are mounted thereon. Also, as shown in FIG.
A driver's seat 12 mounted on the vehicle body cover 11 is provided.

The rear frame 102 is formed in a U-shape whose lower part is open in a front sectional view, and the rear end of the rear frame 102 extends to a position immediately before the transmission case 74. As shown in FIG. 5, inside the rear frame 102, a first power transmission shaft 9 protruding forward from an upper portion of the transmission case 74 is provided.
The PTO shaft 35, which is disposed in the upper part in the front and rear direction and protrudes from the lower part of the transmission case 74, is configured to be able to drive the work implement via a universal joint. When the front part of the universal joint is rotated upward, the universal joint is rotated to the inside of the open surface of the rear frame 102 formed in a “U” shape, and even if the work equipment 75 is raised high by the work equipment mounting device 79, The universal joint does not interfere with the rear frame 102.

Further, steps 40 are formed on the left and right sides of the lower portion of the rear frame 102.
The pipe body is provided with a bent frame body 41 at the outer periphery thereof to reinforce the pipe body so that the user can get on and off from the front side of the step 40. The step 40 is reinforced by a pipe fixed to the frame 41 from below.

A connecting frame 105 is fixedly mounted on the front upper portion of the rear frame 102.
A rear portion of the front frame 101 is fixed on the upper portion, and a steering column 13 is erected on the rear portion of the front frame 101.
1 extends forward and is arranged one step higher than the rear frame 102. Since the work machine mounting device 76 for suspending the above-described work machine 75 is disposed at the front of the front frame 101, the work machine mounting device 76 can be arranged at a position higher than the surface of the step 40. In the position where the work machine 75 is raised, the hitch 21 of the work machine 75 can be held higher than the arrangement surface of the step 40, and the work machine 75 can be raised high.

The power from the engine 73 is supplied to the rear wheels 3.3
A configuration for transmitting the power to the PTO shaft that drives the front wheels 2 and 2 and the work implement 75 will be described. As shown in FIG. 2, the power of the engine 73 is input to the HST transmission 76 via a pulley and a belt, the main transmission is performed by the HST transmission 76, and is input into the transmission case 74. After the sub-shift is performed, the shifted power is transmitted to each wheel. Further, power is transmitted from the input shaft of the HST transmission 76 to the PTO shaft 35 via a gear and a shaft.

As shown in FIGS. 3 and 5, a first input shaft 60 penetrating from one side of the transmission case 74 to the other side is pivotally supported on the transmission case 74, and one side of the first input shaft 60 is supported. The power of the engine 73 is input from the end,
It is output to the PTO shaft 35 via the transmission gears 83 and 82. Further, the other end of the first input shaft 60 is fixed to an input shaft (not shown) of the HST-type transmission so as not to rotate relatively. The power inputted by the first input shaft 60 is
The main transmission is performed by the T-type transmission 76 and transmitted to the second input shaft 64 that is supported in the transmission case 74. The power of the second input shaft 64 is transmitted by transmission gears 65 and 66.
, To the output shaft 77 and the rear wheel drive shaft 70.

Rear wheel drive cases 5, 5 are fixedly provided on the lower left and right sides of the transmission case 74, and the rear wheel drive shafts 70, 70 interlocking with the left and right rear wheels 3, 3 are provided inside. Supported. When power is transmitted to the drive shaft 70, the rear wheel 3 is driven.

As shown in FIGS. 4, 5 and 6, a first power transmission shaft 9 is connected to the output shaft 77. The first power transmission shaft 9 is disposed in the rear frame 102 in the front-rear direction, and a front end of the first power transmission shaft 9 is connected to a transmission shaft 202 rotatably supported at a lower portion of the chain case 201. Have been. The transmission shaft 202 includes the chain case 20.
The rear end of the upper PTO shaft 203 protruding from the lower part of the first PTO 1 is connected so as not to rotate relatively. A sprocket 204 is fixed on the transmission shaft 202, and the chain 20
7 is suspended. The chain 207 is wound around a sprocket 206 fixed to a transmission shaft 205 rotatably supported on an upper part of the chain case 201. Therefore, the power of the transmission shaft 202 is transmitted to the transmission shaft 205, and the rear end of the second power transmission shaft 91 is connected to the transmission shaft 205 to transmit the power to the front case 7 in the front.

A steering rotation shaft 4 is provided in the front frame 101.
3 and a second power transmission shaft 91 are provided. The steering rotation shaft 43 has a rear end connected to a lower end of an operation shaft 45 fixed to the steering handle 14 at the upper end via a universal joint 46. Therefore, by turning the steering handle 14, the steering rotation shaft 43 is configured to be rotatable.

The front end of the second power transmission shaft 91 is connected to a transmission shaft 210 provided in the front case 7 via a universal joint. Transmission shaft 210
Is rotatably supported on an upper part of a chain case 211 disposed in the front case 7 in a vertical direction. A sprocket 212 is fixed on the transmission shaft 210. A transmission shaft 213 is rotatably supported below the chain case 211. A sprocket 214 is fixed on the transmission shaft 213. Have been. The sprocket 207 and the sprocket 214 have a chain 2
15 is wound, and is configured to transmit the power input from the second power transmission shaft 91 to the transmission shaft 210 to the transmission shaft 213 via the chain 215. In this way, the steering rotation shaft 43 and the second power transmission shaft 91 are arranged at a high position, and the height of the front frame 101 is also increased, so that the working machine 75 can be raised high.

The rear end of the transmission shaft 213 has a front PTO shaft 2
16 are connected to each other, and are configured to be able to transmit power to a working machine by connecting a universal joint. A gear 217 is fixedly provided at the front end of the transmission shaft 213.
The gear 217 meshes with the gear 221 of the differential case 220, and transmits the power of the transmission shaft 213 to the differential case 220. A front wheel drive shaft is connected to the differential case 220, and a driving force is transmitted from the front wheel transmission drive shaft to the front wheels.

[0020]

According to the present invention, the present invention is configured as in claim 1.
Since the transmission path of the front drive is configured to bypass the work lifting range of the working machine, the working machine does not contact the front frame, and the lifting range of the working machine by the work machine mounting device is not limited. Also, without increasing the size of the front wheels, the front frame can be configured so that the range of lifting and lowering of the work equipment is not limited, so that the mounting range of the work equipment is not limited by the front wheels, and small-diameter front wheels can be mounted. It is economical. Furthermore, since the above configuration is adopted, the distance from the front frame to the ground increases, so that the height of the work machine that can be mounted increases, and the types of work machines that can be mounted on the middle side of the management work vehicle increase.

The driving force output from the transmission case via a chain is transmitted to a second power transmission shaft disposed inside a front frame positioned above the first power transmission shaft, and the second power transmission shaft is connected to the second power transmission shaft. Since the output of the transmission shaft is input to the differential case of the front frame via the chain, a configuration in which the working range of the working machine is not limited by the front frame is easily configured. Further, parts can be easily replaced, and the components are inexpensive and economical.

Further, the configuration as described in claim 2 has the following effects. There are a total of three PTO shafts, one at the front, one at the rear, and one at the rear that is proportional to the output of the engine. In addition, when an existing work machine is installed, a PTO shaft that can be used may be selected, so that the work machine can be installed without modification. Further, by using the front and rear PTO shafts, it is possible to simultaneously drive two types of working machines.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding management work vehicle with a middle tillage rotary mounted on an abdomen.

FIG. 2 is an overall plan view of a riding management work vehicle in a state where a middle tillage rotary is mounted on an abdomen.

FIG. 3 is a partial side sectional view showing a transmission case in which a power transmission configuration is arranged.

FIG. 4 is a partial partial plan view of a frame showing a power transmission mechanism.

FIG. 5 is a partial side sectional view of a frame showing a power transmission mechanism.

FIG. 6 is a partial cross-sectional side view of a power transmission shaft showing a power transmission mechanism.

[Explanation of symbols]

 9 First power transmission shaft 74 Transmission case 91 Second drive shaft 101 Front frame 201 Chain case 202 Transmission shaft 203 Upper PTO shaft 207 Chain 205 Transmission shaft 210 Transmission shaft 211 Chain case 213 Transmission shaft 215 Chain 216 Front PTO shaft 217 gear

Claims (2)

[Claims] A vehicle body frame is provided in the front-rear direction, two front wheels are supported at a front part of the body frame, and two front and rear wheels of a four-wheel-type riding management work vehicle having two rear wheels supported at a rear part. A passenger management work vehicle in which a work machine is mounted on a middle abdomen via a work machine mounting device, in which a body frame is divided into a front frame and a rear frame, and a front and a back of the front frame are respectively arranged in a vertical direction of a chain case. A drive device for a passenger management work vehicle, wherein the drive device is fixed and transmits power to a front wheel drive shaft provided in a front frame. 2. A transmission shaft supported at a lower portion of the chain case is extended to the abdomen side to form a PTO shaft.
A drive device for a passenger management work vehicle, wherein the drive device is configured to be able to output the data at either rear side.