JPH11318111A - Transmission coupling mechanism for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission coupling mechanism for a working machine, to be mounted on the front of a working vehicle, supplied with a driving force from the vehicle via a transmission axis and designed to move vertically, which facilitates storage of the machine and simplifies the driving force transmission mechanism for the machine. SOLUTION: This transmission coupling mechanism is for a working machine 71, to be mounted on the front of a working vehicle, supplied with a driving force from the vehicle via a PTO axis and designed to move vertically, wherein the axis which supports the front and rear sections of the transmission coupling section 73 and the axis which transmits power are arranged concentrically, the upper link 83 for the vertically movable link mechanism for the transmission coupling section 73 is shorter than the lower link 77, and the rear and front sections of the transmission coupling section 73 are supplied with power via pulleys 94 and 96 and a belt 95.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving mechanism for a working machine mounted on a front portion of a working vehicle.

[0002]

2. Description of the Related Art Conventionally, a work machine is mounted on a front part of a passenger work vehicle so that the work machine can be moved up and down and a driving force is transmitted to the work machine. A front PTO shaft is arranged in the vehicle, and a driving force is transmitted from the PTO shaft to a drive unit of a working machine via a universal joint. Further, a mechanism for transmitting power to the working machine by a belt is also known, but this mechanism has a configuration in which the position of the working machine is fixed.

[0003]

However, in the case of a construction in which a riding work vehicle and a working machine are connected by a universal joint or the like so that the working machine can be raised or lowered, gears such as a bevel gear for transmitting a driving force are used. The number is large, the mechanism is complicated, and the weight of a transmission mechanism such as a universal joint is large, which may increase the working machine and the configuration for supporting the working machine. The loss of driving force is large, and the inertia of the driving mechanism is large, making it difficult to improve operability. Also,
In a mechanism that transmits power to a work machine by belt drive, the position of the work machine is fixed, so that workability may be reduced by the fixed work machine, and the overall length of the passenger management work vehicle may be longer. Therefore, there is a possibility that the operability of the riding management work vehicle is reduced.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a work machine mounted on a front portion of a work vehicle, which transmits a driving force from a PTO shaft of the work vehicle to the work machine so that the work machine can be moved up and down. In the working machine configured as described above, a shaft that supports the rear and front portions of the transmission connecting portion that connects the working vehicle and the working machine, and a shaft that transmits power are respectively arranged on the same axis, and the transmission connecting portion The upper link of the lifting link mechanism is configured to be shorter than the lower link, and the rear and front portions of the transmission connecting portion transmit power via pulleys and belts.

[0005]

Next, an embodiment of the present invention will be described. FIG. 1 is a side view of a passenger work vehicle having a pipe-shaped body frame, FIG. 2 is a plan view of a passenger work vehicle having a pipe-shaped body frame, FIG. 3 is a side sectional view of a work machine, and FIG. FIG. 5 is a side view showing a lifting link mechanism of the working machine, and FIG. 6 is a plan sectional view of a gear case of the working machine.

First, a schematic configuration of the present invention will be described with reference to FIGS. At the front of the body frame 2 of the passenger management work vehicle 1,
A pair of left and right front wheels 3 via the front axle case
A pair of left and right rear wheels 5.5 are mounted on the rear part via a rear axle case. An elevating mechanism is attached to the rear end of the body frame 2, and various working machines such as a tilling work machine can be mounted on the elevating mechanism.

The body frame 2 includes a pair of left and right main frames (lower frames) 20.
0, a sub-frame (upper frame) 21 formed between the front end and the rear end of the main frames 20, 20 and forming an outer frame of the body formed in a substantially U-shape in plan view; A guard 22 and the like are provided at a rear portion of the vehicle 21 so as to be able to be turned upside down and formed in a portal shape as viewed from the front. Step 25 is formed in the front of the fuselage,
The structure is such that the steering wheel can be operated in a safe and comfortable posture in which the foot is placed on the foot 5, and the operator can step on the step 25 when traveling on a downward slope. .

A handle column 31 is erected at the front ends of the main frames 20 and 20 in a direction substantially orthogonal to the steps 25 and 25 of the sub-frame 21, and a handle 32 is disposed at an upper end of the handle column 31. , The handle 32
A seat 36 is provided behind the vehicle. And the seat 36
At the rear extension of the sub-frame 21 at the rear position of the sub-frame 21, the guard 22 formed in a front view portal type is erected via a bracket 27, and the guard 22 can rotate rearward around the bracket 27. Is configured.

The engine 9 is installed behind the seat 36 and on the rear of the main frames 20. Behind the engine 9, the sub-frame 21
A connecting frame 66 formed of a hollow pipe and connecting the rear end portions of the rear extending portions of the pair extends laterally.

The main frames 20, 20, the sub-frame 21, the guard 2
2, and the connection frame 66 are each made of a lightweight and highly rigid material using a hollow round or square pipe. The rear portions of the main frames 20, 20 are extended right above and rise, and the upper ends are connected to the middle of the connection frame 66, so that the frame structure has high rigidity. Further, the transmission case 16 comprises an axial piston pump type traveling hydraulic pump and an HST type continuously variable transmission mechanism for traveling from a traveling hydraulic motor to a main transmission mechanism, and further comprises a sub transmission mechanism by a gear mechanism. ing. The front wheel 3 and the rear wheel 5 are driven via the transmission case 16.

A PTO is provided at the front of the transmission case 16.
An output shaft 16a is provided, and the PTO output shaft 16a
Is connected to a universal joint 16b,
Power is transmitted to a PTO shaft 92 of a working machine 71 described later.

Next, the working machine 71 of the present invention will be described. As shown in FIGS. 3 and 4, the working machine 71 is fixed to a front portion of the frame 2 by a support stay 72, and a transmission connection portion 73 is provided at the front portion of the support stay 72. I have. The transmission connecting portion 73 is connected to the support stay 72.
An upper link 83 rotatably supported on
It is supported by the lower link 77. A mowing portion 78 is connected to the front of the transmission connecting portion 73, and a blade-shaped mowing blade 79 that is rotatable is mounted on the mowing portion 78. A drive device such as the belt 95 is covered by the cover 73a of the transmission connection portion 73, and the drive device can be protected.

Stays 72b and 72c are bent forward from both ends of the support stay 72.
A support shaft 75b is rotatably supported by the stay 72b, and a support shaft 75c is rotatably supported by the stay 72c. The rear end of the lower link 77 is inserted and fixed to the support shaft 75b, and the upper end of the link stay 80 is fixed to the support shaft 75b substantially in front of the support stay 72 on the center side. The rear end of the lower link 77 is a PTO output shaft 16a of the riding management work vehicle 1 in a side view.
And a PTO shaft 92 of the working machine 71.

The front end of a cylinder rod 81b of a hydraulic cylinder 81 is connected to the lower end of the link stay 80.
The support shaft 75b is configured to be rotatable by sliding b. The hydraulic cylinder 81 is configured to be attached to a lower part of the riding management work vehicle 1. For this reason, the drive mechanism for lifting and lowering the work machine 71 causes the work machine 7
1 can be compactly maintained, and the working machine 1 can be maintained in the passenger management work vehicle 1.
The hydraulic cylinder 81 can be disposed near the mounting position of No. 1 and the cylinder stroke of the hydraulic cylinder 81 can be used effectively. Therefore, the work machine 71 can be moved up and down efficiently.

The lower link 7 fixed to the support shaft 75b
At the front end of 7, a pivot 82 is rotatably supported by a stay 82 fixed on a cover of the mowing portion 78, and a rear end of the lower link 77 is fixed to a support shaft 75c pivotally supported by the stay 72c.
The front end of the lower link 77 is rotatably supported by a stay 82. Therefore, as shown in FIG. 5, the hydraulic cylinder 81 is operated, and the link stay 80 is slid forward and backward to move the link stay 80 to the support shaft 75.
, The support shaft 75b having the link stay 80 fixed thereto can be rotated, and the lower link 77 fixed to the support shaft 75b can be rotated.
It is possible to raise and lower the reaping part 78 connected to the front end of the turret 7.

A rear end of an upper link 83 is rotatably supported at substantially the center of the upper portion of the support stay 72, and a front end of the upper link 83 is provided upright at a rear portion of the cover of the reaper 78. The stay 84 is pivotally supported at the upper end thereof. Therefore, the upper end of the stay 84 moves on an arc centered on the support shaft in which the rear end of the upper link 83 is inserted.

The lower end of the stay 84 is connected to the cutting section 78.
When the cutting rod 78 is raised by sliding the cylinder rod 81b of the hydraulic cylinder 81 forward, the upper link 83 causes the upper end of the stay 84 to move backward. To be drawn to
The mowing portion 78 can be moved up and down without making contact with the transmission connecting portion 73. Further, the mowing portion 78 and the lower link 77 can be raised and lowered without twisting and overloading. As described above, the mechanism can be realized with a simple structure by easily connecting the upper end of the stay 84 erected at the rear of the mowing portion 78 to the front end of the upper link 83 configured shorter than the lower link 77. Thus, the durability of the working machine 71 can be improved.

When the cutting section 78 is raised,
Since the mowing portion 78 is pivoted upward about the rear portion, the overall length of the riding management work vehicle 1 can be shortened, and the center of gravity of the work machine 71 when the work machine 71 is raised also moves rearward. Therefore, the moment in the turning direction when the riding management work vehicle 1 moves can be reduced, and the mobility of the riding management work vehicle 1 can be improved.

Further, by making the upper link 83, which is an elevating mechanism of the working machine 71, shorter than the lower link 77, the reaping section 78 can be raised significantly, and the riding management work vehicle 1 including the working machine 71 can be moved. Can be shortened.

Further, a hydraulic cylinder 81 for raising and lowering the work machine 71 is provided at the lower part of the body of the passenger management work vehicle 1, and the lifting mechanism is configured such that the upper link 83 is shorter than the lower link 77. The link 83, the lower link 77, and the hydraulic cylinder 81 can be stored compactly, and the cylinder stroke of the hydraulic cylinder 81 can be used effectively.

Next, the drive mechanism of the work machine 71 will be described. As shown in FIG. 3, FIG. 4, and FIG.
A gear case 91 is provided at the front of the vehicle 2 and a PTO shaft 92 is provided in the gear case 91 in the longitudinal direction of the machine body. The PTO shaft 92 is rotatably supported by the gear case 91 via a bearing.
2 has a rear end protruding from the rear of the gear case 91 so that a driving force can be input.

A gear 92 is provided at the front of the PTO shaft 92.
The gear 92b is engaged with a bevel gear 93b fitted and fixed to the right end of a rotating shaft 93 arranged in the lateral direction of the machine. Thus, the driving force input to the PTO shaft 92 can be transmitted to the rotating shaft 93. A boss of a pulley 94 is inserted and fixed to the rotation shaft 93, and a pulley 96 is disposed in front of the pulley 94, and a belt 95 is wound between the pulley 94 and the pulley 96. The driving force transmitted to the pulley 94 can be transmitted to the pulley 96.
One end of the boss of the pulley 94 is rotatably supported by a support shaft 75c fixed to the stay 72c, and the support shaft 75c is disposed coaxially with the rotation shaft 93.

Therefore, the driving force can be transmitted from the gear case 91 fixed to the support stay 72 to the reaping unit 78 via the pulley 94 and the belt 95, and the driving force is transmitted using the belt 95. The weight of the function can be reduced. Since the weight of the transmission function can be reduced, the vibration of the working machine at the time of transmitting the driving force can be reduced, and the durability of the working machine can be improved. Also, a belt 95 with a small weight is used.
As a result, the loss of the driving force during the transmission of the driving force can be reduced, and the transmission efficiency of the driving force can be improved.

The rotating shaft 93 is disposed on the coaxial center of the supporting shafts 75b and 75c. Even when the working machine 71 is moved up and down, the rotating shaft 93 moves the supporting shafts 75b and 75c. Does not change, and the transmission portion 73 rotates up and down about the rotation shaft 93. Therefore, even when the reaping portion 78 is moved up and down, the reaping portion 78 is moved through the pulley 94.
The driving force can be smoothly transmitted to the motor.

The pulley 96 is fixedly inserted into one end of a rotating shaft 97 disposed substantially in the center left and right direction of the cutting section 78, and is rotatably supported by a supporting shaft 82b. The rotating shaft 97 is inserted into a gear case 98, and one end of the rotating shaft 97 protruding from the gear case 98 is connected to the gear case provided on the reaper 78 via a universal joint. 99.

The rotating shaft 97 is connected to the gear case 98/99.
The gears 100 are inserted and fixed to a portion of the rotating shaft 97 which is inserted into the gear case 98. The gears 100 are engaged with a gear (not shown) inserted and fixed to the rotating shaft of the cutting blade 79 disposed in the vertical direction, and a driving force is applied to the gear as the rotating shaft 97 rotates. It is configured to be able to transmit. With this configuration, the driving force of the rotating shaft 97 is transmitted to the fixed rotating shaft of the cutting blade 79, and the cutting blade 79 is configured to be rotatable.

A gear 102 is fixedly inserted into a portion of the rotating shaft 97 which is inserted into the gear case 99, and is inserted into a rotating shaft of a cutting blade 79 provided in the gear case 99. It is engaged with a gear (not shown) fitted and fixed. As a result, the driving force of the rotating shaft 97 is transmitted to the fixed rotating shaft of the cutting blade 79, and the cutting blade 79 is configured to be rotatable.

With the above configuration, the PTO of the work machine 71
When the driving force is input to the shaft 92, the PTO shaft 9
2, the driving force is transmitted to the reaping unit 78 via the rotating shaft 93 and the pulleys 94 and 96, and the reaping blade 79 is driven by the driving force.
Can be driven. Further, since the support shafts 75b and 75c, which are the support shafts of the work machine 71, and the rotation shaft 93, which is the drive shaft of the work machine 71, are arranged on the same line as described above, the riding management is performed regardless of the movement of the work machine 71. The PTO shaft 9 from the work vehicle 1
The bevel gear 93b inserted and fixed to the rotating shaft 93 via the gear 92b fixed to the PTO shaft 92 without changing the distance between the shafts of the driving shaft transmitting the driving force to the PTO shaft 92 and the PTO shaft 92. The driving force can be transmitted to the motor. The PTO shaft 92 is disposed in a gear case 91 fixedly mounted on a support stay 72 fixedly mounted on the riding management work vehicle. 1 P
The driving force can be smoothly transmitted from the riding management work vehicle 1 to the work machine 71 without changing the positional relationship of the TO input shaft.

[0029]

According to the present invention, a work machine is mounted on a front portion of a work vehicle and the PTO of the work vehicle is attached to the work machine.
In a working machine that transmits driving force from a shaft and is configured to be able to move up and down, the shaft that supports the rear and front portions of a transmission connecting portion that connects the working vehicle and the working machine and the shaft that transmits power are each coaxial. Since it is arranged on the upper side, the structure for transmitting the driving force from the PTO shaft of the work vehicle to the work machine and the structure for ascending and descending can be simplified, and the work machine can be efficiently transmitted. Also in this case, the driving force can be transmitted to the working machine more efficiently than the working vehicle. In addition, with the above configuration, a simple driving force transmission mechanism can be configured, so that the number of members constituting the driving force transmission mechanism can be reduced, and the inertial force of the driving force transmission mechanism can be reduced. Transmission efficiency and the operability of the working machine can be improved. Further, it is possible to improve the durability, assemblability, and maintainability of the working machine.

Further, since the upper link of the lifting link mechanism of the transmission connecting portion is shorter than the lower link, when the work machine is raised by the lifting link mechanism, the work is performed. Since the rotation amount of the front part of the machine can be configured to be larger than the rotation amount of the rear part of the work machine, the total length of the work machine when the work machine is raised can be reduced. For this reason, since the working machine approaches the work vehicle side,
Operability of the work vehicle when the work machine is mounted can be improved.

Further, since the power is transmitted to the rear and front portions of the transmission connecting portion via pulleys and belts, an inexpensive power transmission mechanism can be constructed, and the cost can be reduced. This has made it possible to make maintenance easier.

[Brief description of the drawings]

FIG. 1 is a side view of a passenger work vehicle having a pipe-shaped body frame.

FIG. 2 is a plan view of a passenger work vehicle having a pipe-shaped body frame.

FIG. 3 is a side sectional view of the working machine.

FIG. 4 is a plan view of the same.

FIG. 5 is a side view showing a lifting link mechanism of the work machine.

FIG. 6 is a plan sectional view of a gear case of the working machine.

[Explanation of symbols]

 71 work machine 72 support stay 73 transmission part 77 lower link 78 reaping part 80 link stay 81 hydraulic cylinder 83 upper link 91 gear case 92 PTO shaft

Claims (3)

[Claims] A work machine is mounted on a front part of a work vehicle, a driving force is transmitted to the work machine from a PTO shaft of the work vehicle, and the work vehicle and the work machine are connected to each other. A shaft for supporting a rear portion and a front portion of a power transmission connecting portion, and a shaft for transmitting power are arranged on the same axis, respectively. 2. The transmission coupling mechanism for a working machine according to claim 1, wherein an upper link of the lifting link mechanism of the transmission coupling section is shorter than a lower link. 3. The transmission coupling mechanism for a working machine according to claim 1, wherein power is transmitted between a rear portion and a front portion of said transmission coupling portion via a pulley and a belt.