JP4064678B2 - Tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a half-crawler tractor having a wheel-type front wheel as a front traveling portion and a traveling crawler as a rear traveling portion.
[0002]
[Problems to be solved by the invention]
In the half type tractor having a traveling crawler in the rear traveling part, the grounding of the traveling crawler has a long grounding length to increase the traction force of the vehicle body and prevent the vehicle from sinking, but when the traveling crawler has a fixed structure, The ground contact surface of the traveling crawler does not follow the unevenness of the field, and the vehicle body vibrates or pitches due to the unevenness of the field during traveling, and the tilling depth changes due to the occurrence of pitching during plowing work.
[0003]
[Means for Solving the Problems]
Means for solving the problems of the present invention are as follows.
[0004]
In claim 1, in a half crawler type tractor in which a wheel-type front wheel is disposed in a front traveling portion of a tractor body and a traveling crawler is provided in a rear traveling portion, left and right rear axle cases are disposed on the left and right outer sides of the transmission case of the tractor. And a rear axle case projecting from the outer case, an axle projecting outwardly from the final case, and driving sprockets of the left and right traveling crawlers supported by the axle, the rear axle case and the final case portion Is configured in a gate shape, on the left and right center line of the axle supported by the final case portion of the gate shape, the fulcrum shaft projects on the opposite side of the axle inside the final case portion, and below the transmission case. The bearing base is fixed via a connecting member, and left and right bearings are fixed on both the left and right sides of the upper surface of the bearing base. The bearing supports the inner ends of the left and right fulcrum shafts, supports the fulcrum shaft between the final case part and the left and right bearings with a double-supported structure, and stands up above the front and rear center of the track frame to provide a swing arm. The upper end of the swing arm is swingably supported on a fulcrum shaft, and the left and right track frames and the left and right traveling crawlers can swing around the fulcrum shaft .
[0005]
According to a second aspect of the present invention, in the tractor according to the first aspect of the present invention, a restricting pin that is protruded by a predetermined length is fixed outside the bearing base at a front and rear position of the bearing base, and the swing arm is set to a certain level or more. When swinging, the swinging arm is brought into contact with the restricting pin to restrict swinging of the swinging arm so that it can swing freely within a certain range .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a side view of the whole, and FIG. 2 is a plan view thereof. In the figure, reference numeral 1 denotes a half crawler type tractor, in which left and right wheel-type front wheels 4 and 4 are installed on both sides of a bonnet 3 in which the engine 2 is installed, and a round steering handle 5 is provided at the rear of the bonnet 3. A driver's seat 6 is installed behind the steering wheel 5, left and right traveling crawlers 7, 7 are installed on both sides of the driver's seat 6, and left and right brake pedals 9, 9 and a clutch pedal 10 are arranged at step 8 in front of the driver's seat 6. An operator sits on the driver's seat 6 and travels and moves, and a tilling rotary working machine 12 is mounted on the rear side of the tractor body via a three-point link mechanism 11 so that the tilling work can be lifted and lowered. is doing.
[0007]
As shown in FIGS. 3 to 5, the traveling crawler 7 is disposed between a drive sprocket 14 at the center upper side, a tension roller 15 at the front lower side, an idler roller 16 at the rear lower side, and the front and rear rollers 15 and 16. The drive sprocket 14 is supported on the final case portion 20 of the rear axle case 19 fixed to the left and right outer sides of the transmission case 18 via the outer axle 21. At the same time, the tension roller 15, the idle roller 16, and the track roller 17 are supported by the track frame 22, and the inside of the gate-shaped final case portion 20 on the left and right center line L of the axle 21 (the opposite side of the axle 21). The upper end of a swing arm 24 that protrudes from the fulcrum shaft 23 and is erected above the substantially center of the track frame 22 is supported by the fulcrum shaft 23 so as to be swingable, and is integrated with the left and right track frames 22 around the fulcrum shaft 23. The left and right traveling crawlers 7 are configured to swing.
[0008]
Further, a rectangular bearing base 26 is fixed to the lower side of the transmission case 18 via a connecting member 25, and left and right bearings 27 fixed to the left and right sides of the upper surface of the base 26 are connected to the inner ends of the left and right fulcrum shafts 23. And the fulcrum shaft 23 is provided between the final case portion 20 and the bearing 27 so as to be supported by a both-end support structure so that the support strength of the traveling crawler 7 is improved.
[0009]
A restricting pin 28 that protrudes from the base 26 by a predetermined length at the front and rear positions of the base 26 is fixed to the lower surface of the base 26, and when the swing arm 24 swings more than a certain amount, the arm 24 is moved to the restrict pin 28. By making contact, the swinging of the swinging arm 24 is restricted and the swinging arm 24 is freely swinged within a certain range.
[0010]
As is clear from the above, in the half crawler type tractor 1 in which the traveling crawler 7 is installed in the rear traveling portion of the machine body, the fulcrum portion that rotatably supports the track frame 22 around the axle 21 of the traveling crawler 7. By providing a certain fulcrum shaft 23 on the center line L of the axle 21, the ground contact surface of the traveling crawler 7 can be made to follow the unevenness of the field well, and the body is vibrated by the unevenness of the field during traveling or pitched to the body. Can be easily reduced, and smooth running and work with good plowing depth can be easily performed, and the supporting strength of the running crawler 7 can be improved to keep running performance stable. it can.
[0011]
Further, by supporting the fulcrum portion 23 on the transmission case 18 (including the final case portion 20) separately from the axle 21, the load applied to the track frame 22 is applied to the transmission case 18 via the fulcrum shaft 23. Thus, it is possible to improve the durability of the axle 21 by preventing the load of the track frame 22 from acting on the axle 21, and improving the durability of the axle 21, and reducing the size of the axle and reducing the weight of the axle. Costing can be made possible.
[0012]
Further, by arranging the fulcrum shaft 23 outside the traveling crawler 7 (outside the crawler width) toward the body side, the fulcrum shaft 23 is brought close to the transmission case 18 away from the traveling crawler 7 and inside the body. A good support of the track frame 22 can be easily achieved, and inconveniences such as adhesion of mud from the traveling crawler 7 to the fulcrum shaft 23 can be avoided, and convenience in maintenance and inspection can be achieved.
[0013]
6 and 7 show a configuration example in which the mounting position of the restriction pin 28 is provided so that the front and rear position can be adjusted, and the allowable swing amount of the swing arm 14 can be varied. In this case, a pin mounting member 29 that is long in the front-rear direction is fixed on both the left and right sides of the lower surface of the base 26, and the amount of swinging can be controlled by selecting the restriction pins 28 for the pin holes formed in the front-rear direction of the mounting member 29. 7 is configured to be adjusted in multiple stages, and the one shown in FIG. 7 is supported by a bolt receiving plate 30 fixed to the lower surface of the base 26 with a regulation pin 28 supported via an adjustment bolt 31 so that the front and rear positions can be adjusted. The amount of rocking is adjusted steplessly by adjusting the position of the pin 28 steplessly.
[0014]
Note that it is possible to easily hold the track frame 26 in a fixed state by restricting the swing amount to substantially zero by the restriction pin 28.
[0015]
Further, in the structure shown in FIG. 8, support columns 32 are erected on the front and rear sides of the track frame 22, and a fulcrum member 34 at the center of the vertical frame 33 that is horizontally mounted between the front and rear support columns 32 is supported on the fulcrum shaft 23 in a swingable manner. Thus, the rigidity of the track frame 22 is improved.
[0016]
【The invention's effect】
As is apparent from the above embodiments, the present invention has the following effects.
A half crawler type tractor in which a wheel-type front wheel is disposed in a front traveling portion of a tractor body and a traveling crawler is provided in a rear traveling portion, wherein left and right rear axle cases are disposed on the left and right outer sides of the transmission case of the tractor. And a rear axle case projecting from the outer case, an axle projecting outwardly from the final case, and driving sprockets of the left and right traveling crawlers supported by the axle, the rear axle case and the final case portion Is configured in a gate shape, on the left and right center line of the axle supported by the final case portion of the gate shape, the fulcrum shaft projects on the opposite side of the axle inside the final case portion, and below the transmission case. The bearing base is fixed via a connecting member, and left and right bearings are fixed on both the left and right sides of the upper surface of the bearing base. In addition, the inner ends of the left and right fulcrum shafts are supported, the fulcrum shaft is supported by a double-supported structure between the final case portion and the left and right bearings, and a swing arm is provided by being erected above the substantially front and rear center of the track frame. The upper end of the swing arm is swingably supported on a fulcrum shaft, and the left and right track frames and the left and right travel crawlers can be swung around the fulcrum shaft. By following the ground well, it is possible to reduce the vibration of the aircraft due to the unevenness of the field and the occurrence of pitching on the aircraft during running, making it easy to perform operations that keep smooth running and plowing depth well. In addition, the supporting strength of the traveling crawler 7 can be improved and the traveling performance can be stably maintained.
[0017]
Further, since the fulcrum part 23 is supported by the transmission case 18 separately from the axle 21, the load applied to the truck frame 22 is applied to the transmission case 18 via the fulcrum part 23 to cause the axle 21 to track the axle 21. The load of the frame 22 can be prevented from acting and the axle strength can be improved, the durability of the axle 21 can be improved, and the axle shape can be reduced in size and the axle can be reduced in weight and cost. It is something that can be done.
[0018]
Further, since the fulcrum portion 23 is disposed on the inner side of the body outside the traveling crawler 7, the fulcrum portion 23 is brought close to the mission case 18 on the inner side of the body to easily support the track frame 22 with good strength. In addition, inconveniences such as adhesion of mud from the traveling crawler 7 to the fulcrum portion 23 can be avoided, and convenience in maintenance and inspection can be achieved.
[0019]
According to a second aspect of the present invention, a restricting pin that protrudes a predetermined length is fixed to the outside of the bearing base at the front and rear positions of the bearing base, and when the swing arm swings more than a certain amount, Since the swing arm is in contact with the swing arm, the swing of the swing arm is restricted and freely swingable within a certain range. Therefore, when the swing arm 24 swings beyond a certain level, the arm 24 is attached to the regulation pin 28. By making contact, the swing of the swing arm 24 is restricted, and the swing arm 24 can be freely swinged within a certain range.
[Brief description of the drawings]
FIG. 1 is an overall side view of a tractor.
FIG. 2 is an overall plan view of a tractor.
FIG. 3 is a rear view of a traveling crawler unit.
FIG. 4 is an explanatory side view of a traveling crawler unit.
FIG. 5 is an explanatory diagram of swinging of a traveling crawler unit.
FIG. 6 is another explanatory diagram of a restricting portion.
FIG. 7 is another explanatory diagram of a restricting portion.
FIG. 8 is an explanatory diagram of another configuration of the track frame.
[Explanation of symbols]
1 tractor 7 traveling crawler 18 mission case 21 axle 22 truck frame 23 fulcrum shaft (fulcrum part)
L axle center line

Claims (2)

In a half-crawler type tractor in which a wheel-type front wheel is disposed in the front traveling portion of the tractor body and a traveling crawler is provided in the rear traveling portion, left and right rear axle cases, and rear axle case The outer final case part protrudes, the axle is projected outward from the final case part, and the driving sprockets of the left and right traveling crawlers are supported by the axle, and the rear axle case and the final case part are configured in a gate shape. And, on the left and right center line of the axle supported by the gate-shaped final case part, the fulcrum shaft protrudes on the opposite side of the axle inside the final case part, and via the connecting member below the transmission case, The bearing base is fixed, and left and right bearings are fixed on the left and right sides of the upper surface of the bearing base. Support each inner end, support the fulcrum shaft between the final case part and the left and right bearings in a double-supported structure, and provide a swing arm by standing above the front and rear center of the track frame. A tractor characterized in that an upper end is swingably supported on a fulcrum shaft, and a left and right track frame and a left and right traveling crawler are swingable about the fulcrum shaft . The tractor according to claim 1, wherein a restriction pin projecting a predetermined length is fixedly provided outside the bearing base at a front-rear position of the bearing base, and when the swing arm swings more than a predetermined value, A tractor characterized in that a swinging arm is brought into contact with a pin, the swinging of the swinging arm is restricted, and free swinging is possible within a certain range .

Images