JP3973094B2 - Tread change device for traveling work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for changing treads in wheels such as a pair of rear wheels in a traveling working machine such as a tractor.
[0002]
[Prior art]
Patent document 1 as a prior art is that a hub boss body at the center of a rear wheel of a pair of rear wheels of a tractor is fitted in a non-rotatable manner by a spline fitting to a drive axle. A hydraulic cylinder provided in an axle case with respect to the drive axle is connected to a ring body that is rotatably and non-slidably fitted to the hub boss body, and the rear wheel is moved along the drive axle by the hydraulic cylinder. It is proposed to configure the tread to change.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-42906
[Problems to be solved by the invention]
However, the tread changing device in the preceding can easily change the tread by changing the tread by hydraulic pressure, but the structure is extremely complicated because of the above-described configuration. In addition to inviting an increase, there was a problem that the price increased significantly.
[0005]
It is a technical object of the present invention to provide an apparatus in which the tread can be changed with an extremely simple structure by injecting fluid such as grease.
[0006]
[Means for Solving the Problems]
In order to achieve this technical problem, claim 1 of the present invention provides:
"The Habubosu body at the center of the wheel, and fitted slidably to the drive axle for the wheels, to be fitted portion to the drive axle of the internal in the Habubosu body, so as to surround the outer peripheral surface of the drive axle A first cylinder chamber having a sealed structure and a second cylinder chamber having a sealed structure which is also configured to surround the outer peripheral surface of the drive axle are provided at an appropriate distance in the axial direction of the drive axle. while non-rotatably fitted to the Habubosu body in the portion between the cylinder chamber in a state of slidably with respect to the drive axle, and inlet and outlet of fluid to the first cylinder chamber, said second cylinder chamber Fluid inlet and outlet. "
It is characterized by that.
[0007]
Further, claim 2 of the present invention is
“In the first aspect of the present invention, the drive axle is provided with a sliding restricting portion for the hub boss body on both sides of the hub boss body, and further, the both sliding restricting portions and the A spacer block is detachably mounted between the hub boss body. "
It is characterized by that.
[0008]
[Operation and effect of the invention]
The first cylinder chamber of one of the two cylinder chambers, the pressure and so with opened outlet in the second cylinder chamber of the other, from the inlet for example grease for lubrication is injected at grease pump By injecting the fluid, the hub boss body moves on the drive axle in a direction in which one first cylinder chamber increases and the other second cylinder chamber contracts, and the other second boss body decreases . By injecting a pressurized fluid into the cylinder chamber such that, for example, lubricating grease is injected by a grease pump with the discharge port in one of the first cylinder chambers open, Habubosu body, the upper drive axle, the contrary to the, from the first cylinder chamber of the one second cylinder chamber of the other increases will move in a direction to shrink, thereby, both the left and right wheels It is possible to change the tread.
[0009]
That is, according to the present invention, the tread is changed by injecting fluid pressure into a pair of cylinder chambers provided at an appropriate distance in the axial direction of the drive axle inside the hub boss body at the center of the wheel. The structure is significantly simpler than that of a hydraulic cylinder provided between the axle case as in the prior art, and the size and weight can be reduced, and the price can be greatly reduced.
[0010]
Further, according to the configuration described in claim 2, the hub boss body, and thus the wheel to be attached to the hub boss body, and the wheels to be attached to the hub boss body by a spacer block mounted between the hub boss body and the sliding restriction portions located on both sides of the hub boss body Locking in the tread position so that it cannot be moved has the advantage of ensuring a simple mechanism.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0012]
In this figure, reference numeral 1 denotes an agricultural tractor. The tractor 1 includes a traveling machine body 2, a pair of left and right front wheels 3 supporting the front part of the traveling machine body 2, and the rear part of the traveling machine body 2. It comprises a pair of left and right rear wheels 4 to be supported, and is driven in the forward or backward travel by driving the rear wheels 4 with an engine 5 mounted on the front part of the traveling machine body 2. A steering wheel 6 is used to steer the front wheels 3.
[0013]
Two sealing ring bodies 9 and 10 whose inner circumferences are sealed by O-rings 11 and 12 are appropriately arranged in the axial direction on a portion of the driving axle 7 for the rear wheel 4 that protrudes from an axle case 8 that supports the rear axle 4. A portion between the ring bodies 9 and 10 of the drive axle 7 is formed as a spline shaft portion 7a.
[0014]
A hub boss body 13 is detachably attached to the center of the rear wheel 4, and the hub boss body 13 is attached to a portion of the drive axle 7 protruding from the axle case 8 that supports the hub boss body 13. It is mounted so as to be slidably fitted to both of the ring bodies 9 and 10, and a portion of the inside of the hub boss body 13 between the ring bodies 9 and 10 and a distance S shorter than this. As shown in FIG. 4, the hub boss body 13 is slidably fitted to the drive axle 7 in a non-rotatable manner by being spline fitted to the spline shaft portion 7a of the drive axle 7. .
[0015]
O-rings 14 and 15 for sealing the inner periphery of the hub boss body 13 are provided on the outer circumferences of the ring bodies 9 and 10, while the hub boss body 13 has portions on both sides of the spline hole 13a. By loading ring-shaped seal bodies 17 and 18 made of a soft elastic body such as rubber so as to be closely fitted to the spline shaft 7a, the right ring body 9 and the right seal body in FIG. The first cylinder chamber 19 sealed between the left ring body 10 and the left seal body 18 is sealed between the first cylinder chamber 19 and the second cylinder chamber 19. Each is formed so as to surround the outer peripheral surface of the drive axle 7 .
[0016]
The hub boss body 13 is formed with an inlet 19a and an outlet 19b for the first cylinder chamber 19 and an inlet 20a and an outlet 20b for the second cylinder chamber 20, and the inlet 19a, Grease nipples 21 and 22 for injecting grease are attached to 20a, and screw-type plugs 23 and 24 are detachably attached to both the discharge ports 19b and 20b.
[0017]
In the drawing, the inlets 19a, 20a provided with the grease nipples 21, 22 are provided on the outer side surface 13a of the hub boss body 13 on the opposite side to the traveling machine body 2 on the left and right side surfaces 13a, 13b. , 24 are provided on the inner surface 13b on the traveling machine body 2 side, but in reality, the outlets 19b, 20b provided with the plugs 23, 24 are Like the inlets 19a and 20a provided with the grease nipples 21 and 22, they are provided on the outer surface 13a so that the plugs 23 and 24 can be easily attached and detached from the outside of the rear wheel 4. Yes.
[0018]
A ring body 25 is fixed to the base of the drive axle 7 with respect to the axle case 8, and the movement of the hub boss 13 on the axle case 8 side is restricted by the link body 25, while the tip of the drive axle 7 is The disk 26 is fixed to the inner side of the ring body 25 by a bolt 27, and the movement of the hub boss body 13 in the direction opposite to the axle case 8 side is restricted by the disk 26. between the Habubosu body 13, and, in either or both of between the disc 26 in the outer and the Habubosu body 13, as shown in FIG. 6, a removable at the roots of the right and left Ji halved The ring-shaped spacer blocks 28 and 29 having the structure are loaded.
[0019]
FIG. 3 shows a case where the tread A between the rear wheels 4 is made the narrowest by loading two spacer blocks 28 and 29 between the disc 26 on the outside and the hub boss body 13.
[0020]
In this configuration, in order to widen the tread A from the state shown in FIG. 3, one of the two spacer blocks 28 and 29 is removed, and the outlet 20b in the second cylinder chamber 20 is connected to the plug body. In this state, a manual grease pump (not shown) is set in the grease nipple 21 provided in the injection port 19a in the first cylinder chamber 19, and the first cylinder chamber 19 is opened. by pressure injecting the grease in the grease pump within the Habubosu body 13, while discharging the grease in that the second cylinder chamber 20 from the discharge port 20b, as shown in FIG. 7, the first cylinder Together with the rear wheel 4 until the chamber 19 increases while the second cylinder chamber 20 contracts outwardly so as to abut against the other spacer block 29 Since will moving, it widens the tread A '.
[0021]
Therefore, the pressure injection of the grease is stopped, the discharge port 20b is closed by attaching the plug body 24, and the one spacer block 28 is loaded between the hub boss body 13 and the ring body 25 inside. Thus, the rear wheel 4 can be locked at the position of the tread A ′ so as not to move.
[0022]
In order to further widen the tread, the other spacer block 29 is removed, and the discharge port 20b in the second cylinder chamber 20 is opened by removing the plug 24, and in this state, the note in the first cylinder chamber 19 is opened. A manual grease pump (not shown) is set in a grease nipple 21 provided at the inlet 19a, and grease is injected into the first cylinder chamber 19 by the grease pump, whereby the hub boss body 13 However, while the grease in the second cylinder chamber 20 is being discharged from the discharge port 20b , the first cylinder chamber 19 is further increased while the second cylinder chamber 20 is further reduced as shown in FIG. Since it moves together with the rear wheel 4 until it touches the disk 26 in the direction, it becomes wider on the tread A ″.
[0023]
Therefore, the pressure injection of the grease is stopped, the discharge port 20b is closed by attaching the plug body 24, and the other spacer block 29 is loaded between the hub boss body 13 and the one spacer block 28. Thus, the rear wheel 4 can be locked at the position of the tread A ″ so as not to move.
[0024]
It goes without saying that the tread can be narrowed from A ″ to A ′ and from A ′ to A by performing the reverse operation.
[0025]
In this case, it goes without saying that instead of injecting grease into the cylinder chambers 19 and 20, other fluids can be used, such as injecting lubricating oil or in some cases injecting water. Nor.
[0026]
In the present embodiment, the drive axle 7 is provided with a relief passage 30 for the first cylinder chamber 19 and a relief passage 31 for the second cylinder chamber 20, and both relief passages 30, 31 are provided. Relief valves 32 and 33 are provided in each of the two, and when the supply pressures of the two cylinder chambers 19 and 20 become abnormally high, these are released from the relief valves 32 and 33 to the outside of the cylinder chambers. The supply pressure of the cylinder chambers 19 and 20 is configured not to exceed a predetermined value. The grease that is relieved from the relief passages 30, 31 is used for lubrication in the portion outside the link body 15 that forms the second cylinder chamber 20 in the hub boss body 13.
[0027]
The drive axle 7 is provided with an oil passage 34 for a portion of the inside of the hub boss body 13 outside the ring body 9 forming the first cylinder chamber 19. Lubricating grease is injected into the portion from the grease nipple 35 or lubricating oil is supplied to prevent the portion from rusting and to move the hub boss body 13 along the drive axle 7. It is configured to be smooth.
[0028]
In addition, the present invention is not limited to being applied to the rear wheel in the tractor as in the above-described embodiment, but may be applied to the front wheel or the front wheel and the rear wheel in the tractor, or the riding type rice transplanter or the riding type lawn mower. Of course, the present invention can be applied to either or both of the front wheels and the rear wheels.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor.
FIG. 2 is a plan view of a tractor.
FIG. 3 is a partially cutaway sectional view showing a mounting portion for a rear wheel.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
5 is a cross-sectional view taken along the line VV in FIG. 3;
6 is a cross-sectional view taken along the line VI-VI in FIG. 3;
7 is a sectional view showing a state of wide tread.
8 is a sectional view showing a state of further wider tread.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tractor 2 Traveling machine body 3 Front wheel 4 Rear wheel 7 Drive axle 7a Spline shaft part 8 Axle case 9, 10 Ring body 13 Hub boss body 19 1st cylinder chamber 20 2nd cylinder chamber 19a, 20a Inlet 19b, 20b Outlet 25 Ring body 26 as a sliding restricting portion 26 Disc 28, 29 spacer block as a sliding restricting portion

Claims (2)

A hub boss body at the center of the wheel is slidably fitted to the drive axle with respect to the wheel, and a portion of the hub boss body that fits on the drive axle is surrounded by an outer peripheral surface of the drive axle. A first cylinder chamber having a sealed structure and a second cylinder chamber having a sealed structure configured to surround the outer peripheral surface of the drive axle are provided at an appropriate distance in the axial direction of the drive axle. while non-rotatably fitted in slidable state the Habubosu body in the portion between the chamber relative to the drive axle, and inlet and outlet of fluid to the first cylinder chamber, to said second cylinder chamber A tread changing device in a traveling working machine, comprising a fluid inlet and outlet.   2. The drive axle according to claim 1, further comprising a slide restricting portion with respect to the hub boss body on both sides of the drive axle with the hub boss body interposed therebetween, and further, the two slide restricting portions and the hub boss of the drive axle. A tread changing device for a traveling working machine, comprising a spacer block that is detachably mounted between the body and the body.

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