JPS5865351A - power transmission device - Google Patents

Abstract

PURPOSE:To provide a power transmission gear which can prevent reversion of an output shaft for a working machine at the time of backward motion by disposing a forward and backward change gear on a prime mover so that the change gear is engaged with only a transmission gear for running through a backward counter gear at the backward position. CONSTITUTION:At the time of backward motion, a transmission gear 68 for a working machine and a transmission gear 69 for running are released from direct engagement with a change gear 67, and the change gear 67 is engaged with only the transmission gear 69 for running through a backward counter gear 83, resulting in that turning power is not transmitted to an output shaft 15 for working, and only a running wheel is reversed. A change shaft 66 is provided with the change gear 67 fitted thereon in such a manner as to slide axially, which is engaged with the transmission gear 68 for a working machine and the transmission gear 69 for running at the same time at the time of forward motion. At the time of backward motion, the change gear 67 is moved by a shifter 70 by operation of a shifter lever 74.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for power agricultural machinery such as a rice transplanter.

For power agricultural machinery that requires driving force for traveling and output for working equipment,
In the power transmission device, it is preferable to provide the force 4 untagia for reverse movement on the 1ω motive side rather than the output shaft for the working machine in order to simplify the structure of the entire power f two-speed device.
If this is done, a problem arises in that the output shaft for the working machine rotates in the opposite direction when moving backward.

This invention solves the above problem and provides a power transmission device that does not require reversing the output shaft of the work equipment when reversing, while providing the reverse counter gear in front of the output shaft of the work equipment (on the prime mover side). This is explained below.

The power transmission device according to the present invention is a power transmission device for power agricultural machinery that transmits rotational power of a prime mover to a traveling drive shaft for driving traveling wheels and an output shaft for a working machine, and in the forward position. It simultaneously meshes with both the travel transmission gear that transmits rotational power to the travel drive shaft and the work equipment transmission gear that transmits rotational power to the work equipment output shaft. Traveling transmission gear l Konomi! The present invention is characterized in that a matching change gear is provided, and the change gear is used to switch between forward and reverse travel. Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a side view of a rice transplanter to which the present invention is applied.

A prime mover 2 is provided at the front end of the fuselage 1, and a gear box 3 protruding rearward from the prime mover 2 and a hydraulic pump 5 for operating a hydraulic cylinder 4 are attached to the prime mover 2. Aircraft 1
A chain case 6 serving as a rotating arm is pivotally supported by a shaft 6a at the hip, and a running wheel 7 is attached to the rear end of the chain case 6. The chain case 6 and the running wheels 7 are provided in pairs on both left and right sides of the machine body 1, respectively. Rotational driving force is transmitted to the running wheels 7 from the driving force fi2 via a power transmission device housed in the gear box 3 and a chain in the chain case 6. An arm 8 is provided at the front end of the chain case 6, and the front end of a rod 9 is pivotally attached to the arm 8. The rear end of the rod 9 is connected to a take-up rod 10, and a piston 11 of the hydraulic cylinder 4 is connected to the take-up rod 10.

A planting device 1a, which is a working machine, is installed at the rear of the body 1. The planting device 1a is capable of reciprocating left and right along the control handle 20. It is equipped with a planting rod 22 to be attached.The rotational driving force transmitted from the power transmission device in the gear box 3 to the work equipment output shaft 15 is transmitted to the planting part mission case 12, which is placed in a sideways position where the phantom IC is stored. It is transmitted to the drive shaft 14, and from the drive shaft 14 to the planting part mission case 12.
The planting rod 22. Seedling tank 25 and bacteria feeding device 5 provided on the back side of the seedling tank 25
0 drive unit. This allows seedlings to be planted in the field.

A pair of floats 28° 28' are provided on both left and right sides of the fuselage 1. The rear part of the float 28.28' serves as the rear frame of the rice transplanter (the conduction case 13 on both sides of the machine)
(A), and the front end portion is connected to a connecting member 35. The connecting member 35 is disposed to right and left pass through the space 33 formed between the rear end of the prime mover 2 and the end of the gear box 30F. floats 28 and 28' are connected to each other. The central part of the connecting member 35 is a drive frame 38
゜Vertical opening 71419 rotating piece 42. The lever 44a of the hydraulic valve 44 rotates forward when the ground pressure increases and the front part of the flow 1-28.28' rises relative to the aircraft body. As a result, hydraulic pressure is supplied to the hydraulic cylinder 4, causing the piston 11 to extend and lower the traveling wheels 7,7' on both sides. On the other hand, the tiller becomes shallower and flows) 28.2
If the ground pressure at 8' decreases, the hydraulic pulp is switched in the opposite direction and the running wheels 7, 7' are lifted up. This allows for appropriate planting in response to changes in the depth of the tiller. Incidentally, a fuel tank 47 and a balance weight 37 are arranged at the front part of the fuselage l.

Next, to explain the power transmission device, Fig. 2 and Fig. 3 are cross-sectional views of the power transmission device when moving forward and backward, respectively, and Figs. 4 and 5 are cross-sectional views of the power transmission device when moving forward and backward, respectively. It is a power transmission path diagram in .

In FIGS. 2 and 4, the rotational power of the rotating shaft 61 of the prime mover is transmitted from a gear 62 provided at the tip thereof to a large gear 64 provided on the hydraulic pump drive shaft 63.
The hydraulic pump drive shaft 63 is rotated, and the signal is transmitted to the fixed gear 60 provided on the change shaft 66 via a small gear 65 provided integrally with the man gear 64, thereby rotating the change shaft 66. The change shaft 66I is provided with a change gear 67 which rotates together with the change shaft 66 but is slidably fitted to the same shaft number in the axial direction, and in the forward position, as shown in FIG. Transmission gear 6 for work equipment
8 and the traveling transmission gear 69 at the same time. This change gear 67 can be moved by a shifter 70. Note that by operating the shifter lever 74, the working machine transmission gear 68 and the change gear 67 can be disengaged.

The work machine transmission gear 68 is fitted to the work machine drive 4!11171, and transmits the rotational power of the change gear 67 to the work machine drive shaft 71, or this rotational power is transmitted through the bevel gears 72 and 73. The output shaft 151 for the work machine described above is transmitted. Further, the traveling transmission gear 69 is loosely fitted to the working machine drive shaft 71, and rotates freely around the working machine drive shaft 71, or when the main clutch 75 is engaged, the main clutch 75 is engaged. The rotational power from the change gear 67 is transmitted to a transmission gear 76 which is formed integrally with the clutch 75 and is similarly loosely fitted to the working machine drive shaft 71.

The main clutch 75 is formed as a pin clutch, and normally has a plurality of pins 75a provided at the tip.
is pressed by a spring 77 and fits into a plurality of fitting holes 69a drilled in the side surface of the traveling transmission gear 69, connecting both gears 69 and 76. However, by operating the shifter 78, the pin 75a can be pulled out from the fitting hole 69a to break the connection between the two.

The transmission gear 76 is simultaneously engaged with both side clutch gears 80 and 80' which are slidably fitted to the drive shafts 79 and 79' for the left and right running wheels 7 and 7', respectively. As a result, the rotational power transmitted via the main clutch 75 is transferred to the traveling drive shafts 79, 79'+ on both sides.
This is simultaneously transmitted and rotates the running wheels 7, 7' on both sides. The side clutch gears 80, 80' are always biased by springs 82, 82'i to mesh with the transmission gear 76i, but the shifters 81, 81' of the side clutches attached to the respective side clutch gears 81, 81' By operating the transmission gear 76 to disconnect the side clutch gear on either side and the transmission gear 76, the driving of either the left or right traveling wheel can be stopped.

At the same time, when moving backward, as shown in FIGS. 3 and 5, the working machine transmission gear 68 and the traveling transmission gear 69 are
The direct meshing between the gear and the change gear 67 is released, and the change gear 67 meshes only with the travel transmission gear 69 via the reverse counter gear 83. In this case, no rotational power is transmitted to the working machine output shaft 15, and only the running wheels 7, 7' rotate in the reverse direction. In the illustrated example, the counter gear 83 is used to perform deceleration.

As explained above, in the forward position, the power transmission device according to the present invention transmits power to both the travel transmission gear connected to the travel drive shaft and the work implement transmission gear connected to the work implement output shaft. They mesh simultaneously to transmit the rotational driving force of the prime mover to both gears, but in the rear 1 position, a change gear is provided that meshes only with the travel transmission gear via the reverse counter gear.・Although the switching for reverse movement is performed on the prime mover side rather than the work equipment output shaft, it is now possible to prevent the work equipment output shaft from reversing during reversing. It is convenient for practical use because the rotation of the output shaft for the work machine can be stopped simply by switching the change gear to the reverse position. Furthermore, since the change gear is provided closer to the prime mover than the working machine output shaft, the structure of the power transmission device can be simplified.

[Brief explanation of drawings]

FIG. 1 is a side view of a rice transplanter according to the present invention, FIGS. 2 and 3 are sectional views showing an example of the power transmission device according to the present invention in forward and backward states, respectively, and FIGS. FIG. 5 is a power transmission path diagram in the forward and reverse states. 1. Airframe, 2. Prime mover, 3. Gear box, 4. Hydraulic cylinder, 6. Chain case, 7. Running wheels, 15.
Output shaft for work equipment, 22, planting rod, 25 sake tank, 28
・Float, 61...Rotating shaft, 63.Hydraulic pump drive shaft, 66.Change shaft, 67..Change gear, 68
・Transmission gear for work equipment, 69 Transmission gear for traveling, 71 ・Drive shaft for work equipment, 75 Main clutch, 79.79'...
Traveling drive shaft, 80° 80'--Side clutch gear, 83--Counter gear. Patent applicant: Iseki Agricultural Machinery Co., Ltd. Agent: Hiroshi Sugawara, patent attorney

Claims (1)

[Claims] (1) A power transmission device for power agricultural machinery that transmits the rotational power of a prime mover to a traveling drive shaft and a working machine output shaft for driving traveling wheels, and in the forward position, It simultaneously meshes with both the travel transmission gear that transmits rotational power and the work equipment transmission gear that transmits rotational power to the work equipment output shaft, but in the reverse position, the transmission gear is connected to the travel transmission gear via the reverse counter gear. 1. A power transmission device for a power agricultural machine, characterized in that a change gear that only meshes with the other gear is provided, and the change gear is used to switch between forward and reverse motion.