JPH06102434B2 - Traveling device for work vehicle with boom - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device for a work vehicle with a boom, and more particularly to a crawler type traveling device, and relates to an aerial work vehicle having a work mounting portion attached to the tip of the boom. It is used for boom-equipped work vehicles such as crane trucks that have an article suspending tool attached to the end of the boom.

(Prior Art) A drive wheel is arranged on the upper middle part in the longitudinal direction of the track frame, and driven wheels on the lower ends of the longitudinal direction of the track frame are arranged in a triangle in a side view, and endless tracks are circulated around each wheel so that they can circulate freely. The technique of attaching the semi-crawler track unit formed on the axle instead of the vehicle is disclosed, for example, on page 259 of the New Edition Handbook of Agricultural Machinery (ed.

(Problems to be Solved by the Invention) A conventional semi-crawler track unit (crawler type traveling device) has a flexure of the axle because it is supported only by the axle when it is attached to and supported by the axle in a freely insertable / extractable manner. There was a problem in terms of durability because it could not be firmly supported.

Further, the axle is exposed to the outside, and the sealing performance is poor, which is a problem.

The present invention secures strong support by mounting the crawler traveling device on the axle by supporting it with an inner and outer double cylinder,
The purpose is also to improve the sealing performance.

(Means for Solving the Problem) The present invention is provided with a drive wheel 21 on the upper middle portion of the track frame 20 in the longitudinal direction, and driven wheels 22, 22 on the lower ends of the longitudinal ends of the track frame 20. ,
In order to achieve the above-described object, the following technical means is taken in the traveling device of the work vehicle with a boom in which the endless crawler belts 24 are wound around 22,22 so as to be able to circulate freely.

That is, according to the present invention, the tubular boss portion 28 of the drive wheel 21 is axially insertably / removably fitted onto the axle 10L that is supported by the axle case 12L and projects outward from the case 12L. A tubular support boss portion 33 formed on the upper part of 20 is fitted onto the axle case 12L so as to be axially insertable, and a tubular boss portion 28 of the drive wheel 21 is attached to the support boss portion 33 by a bearing member 35. It is characterized by being rotatably supported by.

(Operation) When the axle 10L is driven, since the tubular boss portion 28 of the drive wheel 21 is fitted onto the axle 10L, the drive wheel 21 rotates.

Since the endless crawler belt 24 is wound around the drive wheel 21 and the front and rear driven wheels 22 and 22 in a freely circulating manner,
The rotation of 21 is transmitted to the endless crawler belt 24, and the work vehicle 1 travels here under the ground contact surface wider than the wheel 16 by the crawler traveling device 18L.

Therefore, it is possible to travel stably on a sloping land without fear of falling, and to run on a soft ground.

Cylindrical support boss 33 formed on the top of the track frame 20
Is fitted onto the axle case 12L, and the axle 1 is attached to the support boss portion 33.
Since 0L is rotatably supported by the bearing member 35,
The axle support part has a double inner / outer structure, which suppresses the flexure acting on the axle 10L and improves the sealing performance for preventing mud and waterproofing.

(Examples) Examples of the present invention will be described below with reference to harvesting work, chemical application, pruning,
An aerial work vehicle used for raising and managing work such as flower picking will be described based on the drawings.

In FIGS. 7 and 8, an aerial work vehicle 1 includes a traveling vehicle body V, a parallel four-link type boom 2 that is vertically moved and turned, and a riding bucket 3 at the tip of the boom 2. There is. The boom 2 is a square pipe-shaped main arm 2A.
And a rod-shaped auxiliary arm 2B inside thereof.

The traveling vehicle body V is a main frame portion F ₁ along the vehicle body front-rear direction,
Boom mounting frame portion F ₂ to be erected on the rear end portion of the main frame portion F _1, and the boom mounting frame portion F ₂
Of consists reinforcing frame portion F ₃ connecting the front end portion of the upper side portion and the main frame portion F _1, there is a vehicle body frame structure.

A pair of left and right traveling devices 4L and 4R are provided on the front end side of the traveling vehicle body V, and a left and right support frame 5a is provided on the rear end side of the traveling vehicle body V, which is swingable up and down about an axis along the longitudinal direction of the vehicle body. It has a pair of caster wheels 5.

The transmission structure to the traveling devices 4L, 4R will be described. An engine E is mounted on the rear end side of the traveling vehicle body V, and an output shaft of the engine E and a relay transmission shaft 6 are interlockingly connected via a transmission belt 7. ing.

Left and right transmission cases 8L and 8R for the left and right traveling devices 4L and 4R are respectively provided in front of the relay transmission shaft 6, and the left and right transmission cases 8L and 8R respectively house forward and backward switching gear transmissions. ing.

The transmission parts of the left and right transmission cases 8L, 8R and the relay transmission shaft 6 are interlockingly connected via a pair of left and right transmission clutches Lc, Rc, respectively, and the output shafts 9L, 9R of the both transmission cases 8L, 8R are connected.
Are linked to the axles 10L, 10R of the left and right traveling devices 4L, 4R by a transmission case 111 having transmission cases 11L, 11R.

The traveling devices 4L and 4R will be described with reference to FIGS. 1 to 6 only for the one side 4L. The other traveling device 4R has the same configuration.

The axle 10L is an axle case 1 attached to the traveling vehicle body V.
2L is rotatably supported by a pair of inner and outer bearings 13, the inner end of the axle 10L has a sprocket wheel 14 for the transmission chain 11L, and the outer end has an axle case.
It is projected to the outside of 12L, and the wheel 1
A mounting hole 17 for mounting the 6 and an angular shaft or spline 19 for mounting the crawler traveling device 18L are formed.

The crawler traveling device 18L includes a track frame 20 having an inverted T shape in a side view, and a drive wheel provided at an intermediate upper portion of the track frame 20 in the longitudinal direction (front-back direction).
21, a driven wheel 22 provided at the lower ends of the track frame 20 in the longitudinal direction, an idle wheel 23 arranged in parallel between the driven wheels 22, and an endless track 24 wound around each wheel 21, 22, 23. , The endless crawler belt 24 is made of an elastic material such as rubber, has a lug 25 on the outer periphery, and has a ridge 26 for preventing wheel slippage on the inner periphery.
And a metal core (not shown) having a space in the longitudinal direction of the belt, and engaging recesses 27 are arranged between the metal cores.

The drive wheel 21 is a sprocket wheel in the figure, and the claw portion 21A on the outer periphery of the drive wheel 21 is hooked on the engagement recess 27 to allow the endless crawler belt 24 to circulate freely.
The cylindrical boss portion 28 formed at the center of the wheel 21 is attached to the axle 10
The end plate 2 is fitted onto the protruding shaft part 15 of L so that it can be inserted and removed in the axial direction.
It is secured with 9, bolts 30 and so on.

2 to 4, the protruding shaft portion 15 and the tubular boss portion 28 are fitted with a square shaft structure (hexagonal shape), but in FIG. 5, they are fitted with a spline 19, which reduces the weight. And the control down is planned.

Further, the drive wheel 21 is a bolt 31 in FIGS.
Although the wheel portion and the boss portion can be assembled and disassembled freely, the cost can be reduced by integrally forming the wheel portion and the boss portion as shown in FIG.

A support boss portion 33 is attached to a column 32 of the track frame 20, and the support boss portion 33 is rotatably fitted on the shaft end side of the axle case 12L via a bush 34, and further supported. On the outer side of the boss 33, the wheel boss 28
Is rotatably supported by a bearing member 35, and the axle portion has a double inner / outer shaft configuration.

That is, in the comparative example shown in FIG. 6, the cylindrical boss portion 28 'of the drive wheel 21' is fitted onto the protruding shaft portion 15 'of the axle 10L' by the spline 19 'and prevented from being pulled out by the bolt 30' or the like. Although the cost is reduced by making the structure simpler than that of the square pipe, the support boss portion 33 'has the axle case 12L'.
Although the bush 34 'is supported by the bush 34', but the boss 28 'is not supported, the axle 10L' is severely bent and bent, and the sealability of the axle 10L 'is not so good. The internal and external double structure of the above has improved these points.

Further, the support boss portion 33 is provided with a grease nipple 36,
The bush 34 is lubricated, and grease leakage from the bush 34 is prevented by the seal 37 and the thrust receiving ring 38.

2 and 4, the axle case 12L has a pipe structure, and the crawler unit is moved inwardly by the snap ring 39, but in FIGS. 3 and 5, the axle case 12L is made of cast metal and the crawler unit is made of cast metal. Inward movement of color 40 and case
It shows what is done with 12L.

Referring to FIG. 4, the pillar 32 is a double-sided square pillar pillar 32A,
It has a nesting structure that can expand and contract with 32B, and inside the stanchion, by grease up via the grease nipple 41,
It is shown that the prismatic columns 32A and 32B are expanded and contracted to have a tensioner function. Therefore, the sliding portion is provided with an oil seal 42 and a drain plug 43.

Therefore, according to the above embodiment, when the wheel 16 is removed from the axle 10L to form the crawler traveling device 18L, the unit of the crawler traveling device 18L is assembled from the outside in the axial direction as follows.

That is, the support boss portion 33 is fitted over the axle case 12L, the wheel boss portion 28 is fitted over the protruding shaft portion 15 of the axle 10L, and the end plate 29 is pressed by the bolt 30 to prevent it from being assembled. To be

On the other hand, when changing from the crawler traveling device 18L to the wheels 16, the unit of the crawler traveling device 18L is removed and the wheel 1
This is done by fitting the boss portion 16A of 6 onto the axle protruding portion 15 and inserting the retaining bolt 44 into the boss portion of the mounting hole 17.

In FIG. 5, the upper side of the line OO is a crawler and the lower side is a wheel.

In addition, in the figure, 45 is a mud cover, 46 is a boom lifting cylinder, 47 is a boom swing cylinder, 48 is a swing axis, and 49 is a control handle.

In the present invention, the drive wheel 21 may be used as a drive drum for frictional transmission, and the boarding bucket 3 may be an article suspending tool.

(Advantages of the Invention) The present invention is as described above, and according to the present invention, the tubular boss portion of the drive wheel is axially insertable and removable with respect to the axle supported by the axle case and protruding outward from the axle case. The tubular support boss portion formed in the upper portion of the track frame is fitted in the axle case so as to be axially insertable and removable, and the tubular boss portion of the drive wheel is fitted to the support boss portion. Since it is characterized by being rotatably supported by, the mounting portion and the supporting portion for the axle have an inner / outer dual shaft structure, and flexure and bending of the axle are prevented, which is highly durable. Although it can be made into one, it can be easily inserted and extracted in the axial direction.

Further, by adopting the double shaft construction of the inner and outer shafts, the sealing property is improved, and it is expected that the perfection of mudproofing and waterproofing will be achieved.

[Brief description of drawings]

The drawings show an embodiment of the present invention and a comparative example. Fig. 1 is an exploded perspective view of the embodiment of the present invention, Fig. 2 is an elevation sectional view of the first embodiment, and Fig. 3 is a view of the second embodiment. Partially omitted elevation sectional view, FIG. 4 is an elevation sectional view of the third embodiment, FIG. 5 is an elevation sectional view of the fourth embodiment, and a portion thereof is omitted, and FIG. A sectional view, FIG. 7 is a side view of a work vehicle with a boom, and FIG. 8 is a plan view of the same. 1 ... Work vehicle, V ... Car body, 4L, 4R ... Traveling device, 10L, 1
0R …… axle, 12L …… axle case, 21 …… drive wheel, 22 …… driven wheel, 24 …… endless belt, 28 …… cylindrical boss part, 33 …… support boss part, 35 …… bearing member.

Claims (1)

[Claims] 1. A drive wheel (21) is provided at an upper part of a longitudinal direction of a track frame (20), and driven wheels (22), (22) are provided at lower ends of both ends of the track frame (20) in a longitudinal direction. In a traveling device for a work vehicle with a boom, which comprises an endless crawler belt (24) wound around wheels (21), (22), (22) in a freely circulating manner, the case (12L) being supported by an axle case (12L). ) The drive wheel (2
The tubular boss portion (28) of 1) is axially inserted and removed, and the tubular support boss portion (33) formed on the upper part of the track frame (20) is attached to the axle case (12L). It is characterized in that the tubular boss portion (28) of the drive wheel (21) is rotatably supported by the bearing member (35) on the support boss portion (33) while being axially insertable and removable. A traveling device for a work vehicle with a boom.