JP2002068008A - Transmission for riding working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance turning performance for a riding working vehicle, in a shifting operation mechanism for the riding working vehicle arranged with crawler travel devices in its left and right sides, having travel transmission and a turning transmission, and provided with a main shifting operation device and a shifting operation sub-device. SOLUTION: The travel device 1 is connected to a turning transmission 26 via a shifting sub-mechanism 75, and the turning transmission 26 is operated to a high speed side by operating the shifting operation sub-device 74 to a high speed side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology related to a transmission mechanism of a riding work vehicle. More specifically, the present invention relates to a speed change mechanism for controlling a turning speed of a riding work vehicle.

[0002]

2. Description of the Related Art Conventionally, after the output of an engine is shifted by a transmission device, it is input to a differential mechanism and transmitted to the left and right axles to drive straight ahead, and the HST device is driven by operating a steering handle. A technique is known in which a driving force from a vehicle is input to the differential mechanism to cause a rotational drive difference between the left and right axles to perform a turning travel.
In addition, regarding turning travel, HS of two pumps and two motors
Japanese Patent Application Laid-Open No. 8-132906 discloses a steering system in which a T device is disposed, and a left and right independent operation levers of an HST pump are operated separately for left and right to enable straight traveling and turning traveling. In a riding type work vehicle including a traveling transmission device and a turning hydraulic continuously variable transmission, deceleration is performed when turning. When the traveling is set to the high speed side, the turning speed is reduced to suppress the sharp turning.

[0003]

However, a small-sized riding work vehicle used in a narrow land or the like needs to turn in a small space, and when the turning speed is reduced, the turning radius becomes large. For this reason, there is a possibility that workability in a narrow land is reduced.

[0004]

In order to solve the above problems, the present invention uses the following means. The shift operation mechanism of a passenger work vehicle, comprising: a crawler traveling device disposed on the left and right sides; a transmission mechanism having a traveling transmission and a turning transmission; and a transmission operating device for controlling traveling speed. In, when the traveling speed change operation device is set to the high speed side, the turning transmission is set to the high speed side to increase the turning speed.

According to a second aspect of the present invention, a crawler traveling device is provided on the left and right sides of the vehicle, the traveling speed change device and the turning speed change device are provided, and the main speed change operation device and the auxiliary speed change operation device for controlling the traveling speed are provided. In a shift operation mechanism of a work vehicle,
The traveling device and the turning transmission mechanism are connected via a subtransmission mechanism, and the turning transmission is operated to a high speed side by operating the subtransmission operating device to a high speed side.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is an overall side view of a work vehicle, FIG. 2 is a plan view of the same, FIG. 3 is a side view showing a configuration of a traveling device, FIG. 4 is a plan view showing a configuration of a truck frame, and FIG.
FIG. 6 is a plan view showing a drive mechanism of a work vehicle, FIG. 6 is a skeleton diagram thereof, FIG. 7 is a side view showing an arrangement of a transmission, and FIG. 8 shows an arrangement of a traveling HST and a turning HST in the transmission. FIG. 9 is a side view showing a connection configuration between the auxiliary transmission operation mechanism and the auxiliary transmission mechanism.

Referring to FIGS. 1 and 2, the overall structure of a working vehicle used in an embodiment of the present invention will be described. In the working vehicle, the crawler traveling device 1 is disposed on both sides of the track frame 8, and the driven rollers 5 and 6 are disposed before and after the crawler traveling device 1, and the driving wheels 7 are provided above the front and rear driven rollers 5 and 6. Are arranged to form a substantially triangular shape in a side view. The work vehicle has a traveling device 1 around which a crawler 2 is wound, and the traveling device performs forward and backward movement and direction change. The traveling device 1 includes a crawler 2, a front wheel 5, a rear wheel 6, and an equalizer 4.
4 and drive wheels 7. Crawler 2
Is wound around the front rolling wheel 5, the rear rolling wheel 6, and the driving wheel 7, and is driven by the rotation of the driving wheel 7. The equalizers 4 are disposed between the front rolling wheel 5 and the rear rolling wheel 6, and are configured to contact the inside of the crawler 2.

A front wheel 5, a rear wheel 6, an equalizer 4.4, and a drive wheel 7 are supported by a track frame 8.
An outer frame 12 is provided on the track frame 8. The transmission and the engine connected to the track frame 8 are disposed inside the outer frame 12, and the front column 9, the seat 11, the hood 14, and the safety frame 13 are disposed on the outer frame 12. A steering wheel 10 is disposed on the front column 9, and the steering wheel 10 is used to change the direction of the work vehicle. A seat 11 is provided behind the front column 9, and an operation lever such as a shift lever is provided near the seat 11. Behind the seat 11, a safety frame 13 configured to be foldable on the outer frame 12 is provided. A bonnet 14 is further provided behind the seat 11, and the engine is mounted on the hood 14.

A work machine 41 can be connected to the rear of the work vehicle. As shown in FIG. 1, the working machine 41 is provided at the rear of the work vehicle 1 via an upper link 49 and a lower link 44.
Is to connect. The driving force of the work vehicle is transmitted to the work machine 41 via the PTO shaft. Work machine 41
The vertical position and the inclination angle of are adjusted by an elevating cylinder and a leveling cylinder disposed on the work vehicle.

Next, the configuration of the traveling device 1 will be described with reference to FIG. The front rolling wheel 5 of the traveling device 1 is rotatably supported at a front portion of the track frame 8, and the rear rolling wheel 6 is rotatably supported at a rear portion.
An equalizer 4.4 is provided between the front wheel 5 and the rear wheel 6, and an upper portion of the equalizer 4 is provided with a track frame 8.
It is fixed at the lower part of. The drive wheel 7 is rotatably supported on the upper part of the track frame 8.

In the traveling device 1, the drive wheels 7 are disposed so as to be displaced from the center position of the traveling device 1. The drive wheel 7 is disposed between the front wheel 5 and the rear wheel 6, behind the middle of the traveling device 1, and above the front wheel 5 and the rear wheel 6. By displacing the drive wheel 7 rearward from the center, a space in which the driver's seat 11 is disposed above the front portion of the traveling device 1 can be configured, and the arrangement height of the driver's seat 11 can be reduced. it can. Furthermore, since the rising angle of the front upper crawler 2 of the traveling device 1 is gentle, the driver can easily get on the work vehicle. By shortening the distance between the driving wheel 7 and the rear wheel 6, the driving wheel 7 and the rear wheel 6
, And the driving efficiency of the driving wheels 7 can be improved. Further, the angle at which the crawler 2 is wound around the driving wheel 7 and the front rolling wheel 5 can be increased. As a result, the crawler can be prevented from jumping (jumping) on the drive wheel, and the crawler can be smoothly driven.

Next, the configuration of a track frame will be described with reference to FIG. As shown in the figure, it is constituted by side support frames 31, left and right connection frames 33, 33, front and rear support frames 34, 34, front side frames 32 and rear support frames 35. The left and right side supporting frames 31, 31 are fixed to the left and right connection frames 33, 33, and the left and right connection frames 33, 33 are connected to the front and rear connection frames 34, 34 extending in the front and rear direction. Is what is done. Further, a front side frame 32 extending obliquely inside the body is connected to a front portion of the side connection frame 32, and a rear support frame 3 is provided at the center of the left and right connection frames 33.
5 is fixed.

The front wheel 6 is provided at the front end of the side support frame 31.
Are rotatably supported, and a rear wheel 6 is rotatably supported at the rear end. The equalizers 4 are fixedly provided on the lower surface at the center of the side support frame 31. The transmission 22, the turning HST 26 and the traveling HST are provided on the front left and right connection frame 33.
27 is provided. The engine 20 is arranged on the front and rear connection frames 34. Further, the outer frame 12 is connected to the front side frame 32 and the rear support frame 35.

Next, the drive mechanism of the working vehicle will be described with reference to FIGS. The output from the engine 20 is
The power is transmitted to the transmission 22 via the universal joint 23, the boss, and the spline. The driving force via the transmission 22 is transmitted to the traveling HST 27 and the turning HST 26. At the time of turning, the turning HST 26 is operated to control left and right driving forces to perform turning. H for traveling
The driving force shifted through ST27 is transmitted to the left output shaft 28 and the right output shaft. The right output shaft is provided below the traveling HST 27. The driving force transmitted to the left and right output shafts is transmitted to the drive transmission shafts 29 extending rearward. Drive transmission shaft 29
Is connected to the axle case 30, and the drive wheel 7 is disposed on the axle case 30. Thus, the driving force of the engine 20 is transmitted to the driving wheels 7 after the speed is changed.

The transmission 22 is connected to a front PTO transmission case 37 provided with the front PTO shaft 24 and a rear PTO transmission shaft 51. A part of the driving force input to the transmission 22 is transmitted to the front PTO shaft 24 via the front PTO transmission case 37. The rear PTO transmission shaft 25 is connected to a rear PTO transmission case 36, and a driving force is transmitted to the rear PTO shaft 25 via the rear PTO transmission case 36. The turning HST 26 changes the rotation ratio of the left and right drive wheels 7 to change the direction of the work vehicle.

Referring to FIG. 6, the transmission mechanism and the turning mechanism will be described in more detail. The driving force of the engine 20 is transmitted to the turning HST 26 via the transmission pipe 71 and transmitted to the traveling HST 27 via the transmission pipe 72. The output of the traveling HST 27 is input to the differential 73 through the subtransmission mechanism 74. In addition, HST2 for turning
The output from 6 is also input to the differential 73 through the subtransmission mechanism 75. The output from the traveling HST 27 is input to a gear 77 connected to the sun gear of the differential device 73, and the output from the turning HST 26 is input to the outer gear of the differential device 73 left and right. Thus, the left and right traveling devices can be driven in opposite directions to make a turn.

Next, the operation mechanism of the transmission 22 will be described with reference to FIGS. The transmission 22 is disposed on the side frame 32, and the upper portion of the transmission 22 is fixed to the outer frame 12. Transmission 22
Is connected to an auxiliary transmission lever 61 and a main transmission lever 62 to control the traveling speed of the work vehicle. The auxiliary transmission lever 61 is connected to an auxiliary transmission mechanism, and when the auxiliary transmission lever 61 is tilted to the high speed side, the turning HST
The drive speed 26 is shifted to a higher speed. As a result, even when the traveling speed is set to a high speed, the turning radius can be reduced.

In the transmission 22, the traveling HST 27 is arranged such that the rotation axes of the hydraulic pump and the hydraulic motor are in the horizontal direction, and the hydraulic pump and the hydraulic motor are located in front and rear. The turning HST 26 is disposed in front of the traveling HST 27, and the turning shaft of the hydraulic pump and the hydraulic motor is set to the horizontal direction, and the hydraulic pump and the hydraulic motor are disposed vertically. . HST2 for turning
The HST 6 and the traveling HST 27 are disposed on the side of the transmission 22, and are configured to connect the hydraulic port to the transmission 22.

An arm 63 is fixedly provided at the base of the sub-transmission lever 61, and the arm 63 rotates in accordance with the rotation of the sub-transmission lever 61. A rod is connected to the arm 63, and the rod is connected to a link mechanism that controls the connection of the subtransmission. By operating the sub-transmission lever 61, the sub-transmission mechanism is switched, and acceleration / deceleration is performed. The turning HST 26 controls the drive ratio of the left and right crawler traveling devices 1, and is configured to increase or decrease or reverse the driving speed of one crawler traveling device 1 with respect to the other. By controlling the turning HST 26, the turning speed can be adjusted.

Next, the connection configuration of the auxiliary speed change lever 61 will be described. As shown in FIG.
The upper end of the arm 63 connected to 1 is connected to the rod 65 via the swash plate control mechanism 64 of the traveling HST 27. The rod 65 is connected to a plate 66, and the plate 66 is rotatably supported above the turning HST 26. The plate 66 is connected to an auxiliary speed changeover mechanism 68 via a rod 67. By rotating the plate 66, the auxiliary transmission switching mechanism 68 is operated.

When the auxiliary shift lever is positioned on the speed increasing side, the output of the turning HST 26 is set to the above-described differential 73 through a high speed side gear.
As a result, the turning performance of the working vehicle at high speed can be improved. By improving the turning performance at high speed, the operability of the work vehicle in a narrow space can be improved, and an efficient work path can be taken.

[0022]

As described in the first aspect, a riding operation in which a crawler traveling device is disposed on the left and right, a transmission mechanism has a traveling transmission and a turning transmission, and a shift operating device for controlling traveling speed. In the vehicle speed change operation mechanism, when the traveling speed change operation device is set to the high speed side, the turning transmission is set to the high speed side and the turning speed is increased, so that the turning performance of the work vehicle can be improved.

According to a second aspect of the present invention, there is provided a crawler traveling device disposed on the left and right, a traveling transmission and a turning transmission, and a passenger equipped with a main transmission operating device and an auxiliary transmission operating device for controlling traveling speed. In a shift operation mechanism of a work vehicle,
The traveling device and the turning transmission mechanism are connected via the subtransmission mechanism, and the turning transmission is operated to the high-speed side by operating the subtransmission operating device to the high-speed side. And the work efficiency using the work vehicle is increased.

[Brief description of the drawings]

FIG. 1 is an overall side view of a work vehicle.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view showing the configuration of the traveling device.

FIG. 4 is a plan view showing a configuration of a track frame.

FIG. 5 is a plan view showing a drive mechanism of the work vehicle.

FIG. 6 is a skeleton diagram.

FIG. 7 is a side view showing the arrangement of the transmission.

FIG. 8 shows a traveling HST and a turning HS in the transmission.
The side view which shows the arrangement structure of T.

FIG. 9 is a side view showing a connection configuration between the auxiliary transmission mechanism and the auxiliary transmission mechanism.

[Explanation of symbols]

 7 Drive Wheel 20 Engine 21 Clutch 23 Universal Joint 26 HST for Turning 27 HST for Traveling 29 Driving Force Transmission Shaft 71 ・ 72 Conducting Pipe 73 Differential Device 74 ・ 75 Secondary Transmission Mechanism 77 Gear

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masafumi Tsujida 428 Enami, Okayama-shi, In-house (72) Inventor Yoshikazu Hiroshige 428 Enami, Okayama-shi In-house, in-house (72) Inventor Fujiki Katsumi 428 Enami, Okayama City Seirai Industrial Co., Ltd. In-house (72) Inventor Takao Oniki 428 Enami, Okayama City Seirei Industrial Co., Ltd. In-house ) Inventor Takanobu Shimada 428 Enami, Okayama City In-house F-term (reference) 3D039 AA03 AA04 AB11 AB22 AC21 AC33 AC37 AC40 AC70 AC77 AD22 AD23 AD53 3D052 AA02 BB02 BB08 DD01 DD03 EE01 FF01 FF02 GG03 HH01

Claims (2)

[Claims] 1. A shift operation mechanism for a passenger work vehicle having a crawler traveling device disposed on the left and right, a transmission mechanism having a traveling transmission and a turning transmission, and a transmission operating device for controlling traveling speed. A transmission device for a passenger work vehicle, wherein when the speed change operation device is set to a high speed side, the turning transmission is set to a high speed side to increase the turning speed. 2. A shift operation mechanism of a passenger work vehicle having a crawler traveling device disposed on the left and right sides, having a traveling transmission and a turning transmission, and having a main transmission operation device and an auxiliary transmission operation device for controlling traveling speed. Wherein the traveling device and the turning transmission mechanism are connected via a subtransmission mechanism, and the turning transmission is operated to a high speed side by operating the subtransmission operating device to a high speed side. apparatus.