JPH06127442A - Crawler running body - Google Patents

Abstract

PURPOSE:To keep ensurance of an angle of separation from a floor and to smooth running over stairs by arranging an idler between large and small diameter wheels, in a crawler running device, such as a conveying vehicle, running over stairs and varying the ground touching distance of a crawler through moving wheel bodies around which a crawler is run. CONSTITUTION:Large wheels 2 are arranged in an idling state to the right and left ends of an axle supporting a car body by means bearings in the vicinity of the center of gravity of a car body 1 and an idling wheel 3 is arranged to the tip part of a truck frame 20 rocked around an axle through the working of a hydraulic cylinder 6. A drive wheel 4 fitted in the output shaft of a running transmission is arranged to the rear end part of the car body 1. An idler 7 is located in a portion situated near the large wheel 2 between the large wheel 2 and a drive wheel 4. In this case, the idler 7 is disposed in a state that a contact part of it with an endless crawler 5 is slightly protruded from a tangential line through which the large wheel 2 is connected to the driven wheel 4. This constitution causes an angle (b) of separation from a floor to be ensured at the crawler 5 between the idler 7 and the driven wheel 4 and excellent execution of running over the edge part of the stair.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device applied to various vehicles such as a truck (hereinafter referred to simply as a truck), and particularly, to traveling on a non-flat road such as stairs. The present invention relates to a crawler traveling device that is designed so that it can be performed.

[0002]

2. Description of the Related Art It is widely known that a crawler traveling vehicle is advantageous for traveling on rough terrain or soft ground, or traveling on uneven roads such as stairs. And the black in this type of vehicle
When traveling on uneven roads such as stairs, the LA traveling device can stably support the vehicle body with a long ground contact length, and
When traveling on a general flat road, it is preferable that the contact length is shortened so that the vehicle can travel in a state where the traveling resistance is small. As a conventional example thereof, for example, Japanese Patent Publication No. 63-193.
Those disclosed in Japanese Patent No. 91 and Japanese Patent Publication No. 15433/1989 are known.

[0003]

By the way, in the above-mentioned conventional crawler traveling device, there are three wheels, a large-diameter wheel disposed in the center of the vehicle body in the front-rear direction and idle wheels and drive wheels disposed in front of and behind the large-diameter wheel. The contact length of the endless crawler belt is changed by hanging the endless crawler belt and moving the idler wheel (or drive wheel) located at the front end portion in the traveling direction up and down by the position adjusting means to change the hanging shape of the endless crawler belt. However, when the idler wheel is moved downward to increase the contact length of the endless track, the grounded part of the endless track changes to a tangent line that circumscribes the large diameter wheel and the idler wheel. As a result, it is difficult to secure a bed leaving angle at the front end of the course of travel, so there is a problem that it is difficult for the front end of the course to climb over the edge of the stairs, and it is difficult to smoothly run up the stairs. . The present invention has been made in view of the above problems, and an object of the present invention is to move a wheel body around which an endless track is wound to change a hanging shape of the endless track, thereby grounding the endless track. Although it is a crawler traveling device whose length can be changed, the crawler traveling device is always provided with a floor leaving angle so that the traveling over the edge portion of the stairs can be favorably performed. To provide.

[0004]

In order to achieve the above object, a crawler traveling device according to the present invention has a large-diameter wheel arranged near the center of gravity of a vehicle body and a small-diameter wheel arranged in the front and rear portions thereof. An endless crawler belt is hung around the wheel body and one of the small diameter wheel bodies is moved by the position adjusting means to change the hanging shape of the endless crawler belt so that the ground contact length of the endless crawler belt can be changed. -In the la traveling device, an idler in which an endless crawler belt contact portion projects outwardly from a tangent line connecting the large diameter wheel and the other small diameter wheel body at a portion between the large diameter wheel and the other small diameter wheel body. Is provided so that the bed end angle is ensured in the endless track between the idler and the other small-diameter wheel. The idler is installed close to the large-diameter wheel so that the idler and the large-diameter wheel engage with the driven projection formed on the inner peripheral side of the endless crawler track in the inner and outer directions. It is preferable to configure.

[0005]

In the crawler traveling device according to the present invention, the large diameter wheel and the endless crawler belt that is hung over the two small diameter wheels arranged in the front and rear thereof are the large diameter wheel and the two small diameter wheels. Between the other small-diameter wheel of the body, the idler is abutted against the idler and is projected outward from the tangent line connecting the large-diameter wheel and the other small-diameter wheel. Then, when one of the two small diameter wheels is moved to the normal position by the operation of the position adjusting means and is held, the endless track has the axial distance between the large diameter wheel and the one small diameter wheel body. It becomes a normal ground contact length equivalent to, and the endless track at the ground contact gap part between the large diameter wheel and the other small diameter wheel is in a hanging state with a rake angle that inclines upward with respect to the flat road surface. Becomes Next, when one of the small diameter wheels held in the normal position is moved down and maintained at a predetermined position by the operation of the position adjusting means, the ground contact length of the endless track is between the large diameter wheel and the idler shaft. Although it will be lengthened to a length equivalent to the distance, even if the contact length is changed to be longer, the endless track of the ground contact between the idler and the other small diameter wheel is However, it is still kept in a hung state with a rake angle that is inclined upward with respect to a flat road surface.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a side view of a carrier equipped with a crawler traveling device according to the present invention, FIG. 2 is a partially cutaway plan view of the carrier, FIG. 3 is a partially enlarged partial view of FIG. 1, and FIG. 3 and 4 are vertical plan views, and FIGS. 5 and 6 are explanatory views of the operation of the present invention. The carrier whose overall state is shown in FIGS. 1 and 2 is driven by a prime mover ₍ 9 ₎ . The vehicle body ₍ 1 ₎ equipped with a pair of left and right chlorator traveling devices is equipped with a loading platform ₍ 10 ₎ , and a walking follow-up operation unit ₍ 11 ₎ is provided at the rear or front portion of the vehicle body ₍ 1 ₎ .

The vehicle body ₍ 1 ₎ is composed of a pair of left and right upper frames ₍ 12 ₎ tilted to the front, rear, rear, and high in a side view (see FIG. 1), and a pair of left and right lower frames also having a substantially inverted L shape in a side view. ₍ 13 ₎ forms a frame, and one end of the cargo bed ₍ 10 ₎ is rotatably attached to the front lower end of the vehicle body ₍ 1 ₎ and an upper frame is formed.
_The walking follow-up driving part ₍ 11 ₎ is continuously provided at the upper rear part of the ₍ 12 ₎ part, and further, the hydraulic device ₍ 14 ₎ , the prime mover ₍ 9 ₎ , and the traveling mission ₍ 15 ₎ are installed in the lower frame ₍ 13 ₎ part from the front. ₎ Is provided.

The traveling mission ₍ 15 ₎ is capable of continuously setting both forward and reverse speeds, and its input portion is a transmission mechanism ₍ 16 ₎ which is a prime mover ₍ 16 _).
9 ₎ is linked to the output of the hydraulic equipment ₍ 1).
4 _{) is} also interlocked with the output of the prime mover ₍ 9 ₎ by another transmission mechanism ₍ 17 ₎ . Further, the loading platform ₍ 10 ₎ pivotally mounted on the vehicle body ₍ 1 ₎ is equipped with a hydraulic cylinder ₍ 18 ₎ for raising and lowering the loading platform that is interposed between the rearward portion and the lower frame ₍ 13 _{). )} , The hydraulic cylinder ₍ 18 _{) of which} is actuated and controlled by the hydraulic device ₍ 14 ₎ .

Vehicle body in which various devices are arranged as described above₍1₎
A pair of left and right crawler traveling devices are installed on the
However, in the present invention, this
The ra traveling device is provided with the following configuration. Prime mover
Machine₍9₎A vehicle body equipped with various devices such as₍1₎The center of gravity of
Axle near the center of gravity₍19₎Is installed sideways and its axle
₍19₎Large diameter wheels on both left and right ends₍Two_{) (}Two₎Is fitted loosely
It is equipped. Also, large diameter wheels₍Two_{) (}Two₎Inside
axle₍19₎On track frame₍20_{) (}20₎The rear end of
Each track frame is rotatably fitted.₍Two
0₎Tension mechanism at the front extension end of₍21₎One small through
Idler wheel that is a radial ring₍Three₎Is provided and opposite
Car body₍1₎At the rear end of the₍1
5₎Output shaft protruding left and right from₍22_{) (}22₎At each end of
Drive wheel that is the other small diameter wheel ₍Four₎Is fitted, and further,
Large diameter wheel₍Two₎And drive wheels₍Four₎Large diameter ring between₍Two₎Close to
Idler on the part₍7₎Are provided with these large diameter wheels
₍Two₎, Idler wheel₍Three₎, Drive wheels₍Four₎And idler₍7₎of
Endless track on the outside₍5₎It is hung around and runs a pair of left and right crawlers
A line device is configured. The above idler₍7
₎The endless track₍5₎Large diameter wheel in contact with₍Two₎And drive wheels₍
Four₎Tangent line connecting₍T₎It is in a state where it projects more outward than
So the car body₍1₎Lower frame₍Thirteen₎To pivot in
It is provided. Also, large diameter wheels₍Two₎And idler₍7₎of
Proximity means that parts of both overlap each other in side view.
It also includes the case where it becomes a state.₍
Two₎And idler₍7₎Does not hinder their operation.
It is recommended to shorten the distance between the two axes as much as possible
It is preferable.

A hydraulic cylinder, which is position adjusting means ₍ 6 ₎ , is interposed between the track frame ₍ 20 ₎ and the upper frame ₍ 12 ₎ of the vehicle body, and the track frame is actuated by the operation of the hydraulic cylinder. When the frame ₍ 20 ₎ is swung, the idler wheel ₍ 3 ₎ provided at the front end of the frame ₍ 20 ₎ moves up and down to change the hanging shape of the endless track ₍ 5 ₎ . When the hydraulic cylinder ₍ 6 ₎ is kept in the normal state, the idler wheel ₍ 3 ₎ is held in the normal position as shown in Fig. 1, and the endless track ₍ 5 _{) is held.}
Is a normal ground length ₍ L1 ₎ that grounds at a portion corresponding to the axial distance between the large diameter wheel ₍ 2 ₎ and the idler wheel ₍ 3 ₎ , and the track frame ₍ is operated by the hydraulic cylinder ₍ 6 _). When swung ₂₀₎ downwardly idler wheel ₍₃₎ is lowered dynamic in place, as seen in FIGS. 5 and 6, an endless track _(5), the larger-diameter ring ₍₂₎
And the idler ₍ 7 ₎ are configured to be in a long ground length ₍ L2 ₎ state in which a portion corresponding to the axial distance is grounded.

The endless crawler belt ₍ 5 ₎ is formed into a belt shape by an elastic material such as rubber in which a steel code is embedded, and a lug ₍ 23 ₎ group of patterns is appropriately formed on the hanging outer wrinkle. It was set, and the train-around has become a thing which projects a driven protrusion ₍₈₎ group of crocodile lateral Article 2 at a predetermined pitch, the driving wheel to the driven protrusions ₍₈₎ group of ₍₄₎ The drive unit ₍ 24 ₎ is forcibly rotated by sequentially engaging and rotating.

The outer periphery of the drive wheel ₍ 4 ₎ is fitted between the two left and right driven projections ₍ 8 ₎ of the endless crawler belt ₍ 5 ₎ ,
Drive part ₍ 24 ₎ projecting from the fitting part to the left and right sides
There have become a sequentially engaging the driven projection ₍₈₎ group as described above, also, the idler wheel ₍₃₎ and the larger-diameter ring _(2), the driving wheel ₍
As in 4 ₎ , the outer peripheral part is fitted between the two left and right driven projections ₍ 8 ₎ to rotate, whereas the idler ₍ 7 ₎ has its outer peripheral part on the left and right two lines. The driven projections ₍ 8 ₎ are rolled so that they can be externally fitted and held, that is, the large diameter wheel ₍ 2 ₎ and the idler ₍ 7 ₎ provided in the vicinity of the large diameter wheel ₍ 2 _). The endless crawler belt ₍ 5 ₎ is configured to engage with a group of driven projections ₍ 8 ₎ formed on the inner peripheral side of the endless crawler belt ₍ 5 _{) in} the inner and outer directions.

In the crawler traveling device constructed as in the embodiment, the large diameter wheel ₍ 2 ₎ , the idler wheel ₍ 3 ₎ arranged before and after the large diameter wheel ₍ 2 ₎ and the drive wheel ₍ 4 ₎ are provided outside. Endless crawler belt ₍ 5
₎ Is disposed close to the large diameter wheel ₍ 2 ₎ with the endless crawler belt abutting portion projecting outwardly from the tangent line ₍ T ₎ connecting the large diameter wheel ₍ 2 ₎ and the driving wheel ₍ 4 ₎ . Since the idler ₍ 7 ₎ is also brought into contact with the idler ₍ 7 ₎ at the same time, the floor clearance ₍ b ₎ at which the endless track rises obliquely upward with respect to the flat road surface can be provided between the idler ₍ 7 ₎ and the drive wheel ₍ 4 ₎ . Thus, when the operating flat ground haul vehicles, idler wheel ₍₃₎ is held in normal position of the upper hydraulic cylinder ₍₆₎ is kept in the normal position, the endless track _(5, as seen in FIG. 1 ₎ Means that the vehicle is grounded with a short ground contact length ₍ L1 ₎ corresponding to the axial distance between the large diameter wheel ₍ 2 ₎ and the idle wheel ₍ 3 ₎ , and the vehicle travels in a state with low running resistance. A large take-off angle is secured in the endless track ₍ 5 ₎ in the ground contact area between the large diameter wheel ₍ 2 ₎ and the drive wheel ₍ 3 ₎ .

Next, when traveling on an uneven ground such as stairs, if the hydraulic cylinder ₍ 6 ₎ is operated to a predetermined extended state, the operation causes the track frame ₍ 20 ₎ to swing downward. The idler wheel ₍ 3 ₎ is lowered into place and the endless track
The ground contact length of ₍ 5 ₎ is extended to the length ₍ L2 ₎ corresponding to the axial distance between the idler wheel ₍ 3 ₎ and the idler ₍ 7 ₎ .
As can be seen in Fig. 5, the endless track ₍ 5 ₎ is run under the stable supporting condition in which the endless track ₍ 5 ₎ is in contact with the edge portions of a plurality of stairs at the same time. And when traveling up the stairs, as shown in FIG. 5, if the carrier travels backward ₍ R ₎ ,
Since the front end of the endless track ₍ 5 _{) in} the traveling direction rises obliquely forward and upward due to the above-mentioned floor separation angle ₍ b ₎ , the front end of the endless track collides with the edge part of the stairs, and the situation cannot be overcome. There is no change and smooth climbing is performed.

Further, when traveling on a flat or substantially flat slope, as shown in FIG. 6, it is sufficient to drive the carrier vehicle forward ₍ F _). Since the corner ₍ b ₎ is secured in the rear part of the endless track, even if the carrier unexpectedly tilts backward, the drive wheel ₍ 4 ₎ will directly collide with the sloped road surface. Is avoided. Further, in any of the operation configurations of flat land operation, non-flat land operation such as stairs, and ramp operation, the large diameter wheel ₍ 2 ₎ and idler ₍ 7 ₎ are kept in the same position by keeping the positions close to each other. One large diameter wheel ₍ 2 ₎ fits between two left and right driven projections ₍ 8 ₎ to rotate, while the idler ₍ 7 ₎ moves the two left and right driven projections ₍ 8 ₎ group. Since the state of external fitting and rotation is maintained in the state of holding from the outside,
Good running with no worries about endless track removal from any running position.

[0016]

As described above, according to the present invention, the large-diameter wheel ₍ 2 ₎ and the small-diameter wheels ₍ 3 _{) (} 4 ₎ arranged in front of and behind it.
One of the small-diameter Watai the train-around shape of an endless track ₍₅₎ which train-around _(the
3 _{) Although} it is a crawler traveling device that can change the ground contact length of the endless track by changing the position by moving the position, no matter how the ground contact length is changed, the necessary parts of the endless track are Since the floor take-off angle ₍ b ₎ is always ensured, when traveling on uneven terrain such as stairs, there is no possibility of getting over the edge of the stairs, and good traveling is always carried out. Even if the vehicle body unexpectedly leans backward while traveling on a slope, it is possible to avoid the situation where the other small-diameter wheel body ₍ 4 ₎ directly collides with the road surface, and safety is improved. And a large diameter wheel
₍₂₎ the other small diameter Watai ₍₄₎ disposed between idler - ₍₇₎
Is installed close to the large diameter wheel ₍ 2 ₎ , and the idler ₍ 7 ₎ and the large diameter wheel ₍
2 ₎ is configured to engage with the driven projection ₍ 8 ₎ on the inner circumference of the endless crawler belt by inwardly and outwardly engaging with the driven projection ₍ 8 ₎ , so that it is possible to reliably prevent the endless crawler belt from derailing.

[Brief description of drawings]

FIG. 1 is a side view of a carrier equipped with a crawler traveling device according to the present invention.

FIG. 2 is a partially cutaway plan view of a carrier equipped with a crawler traveling device according to the present invention.

FIG. 3 is an enlarged partial view of a portion of FIG.

FIG. 4 is a vertical plan view of the illustrated portion of FIG.

FIG. 5 is an operation explanatory view showing a state in which the transport vehicle is traveling up the stairs.

FIG. 6 is an operation explanatory view showing a state in which the transport vehicle is traveling on a flat slope.

[Explanation of symbols]

 1 vehicle body 2 large diameter wheel 3 one small diameter wheel body (idling wheel) 4 other small diameter wheel body (driving wheel) 5 endless track 6 position adjusting means (hydraulic cylinder) 7 idler 8 driven protrusion T large diameter wheel and the other Tangent line connecting the small diameter wheel of

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fuyuki Morishita 428 Enami, Okayama City, Okayama Prefecture Seirei Industrial Co., Ltd.

Claims (2)

[Claims] 1. An endless track ₍ 5 ₎ is hung around a large-diameter wheel ₍ 2 ₎ arranged near the center of gravity of a vehicle body ₍ 1 ₎ and small-diameter wheels ₍ 3 _{) (} 4 ₎ arranged in the front and rear thereof. , One of the small-diameter wheels ₍ 3 ₎ is moved by the position adjusting means ₍ 6 ₎ to change the hanging shape of the endless track ₍ 5 _{) so that} the ground contact length of the endless track ₍ 5 ₎ can be changed. -In the traveling device, the large-diameter wheel ₍
2 ₎ and the other small-diameter wheel body ₍ 4 ₎ , the endless crawler belt contact portion connects the large-diameter wheel ₍ 2 ₎ and the other small-diameter wheel body ₍ 4 ₎ with a tangent line ₍
An idler ₍ 7 ₎ protruding further than T ₎ is provided so that the floor clearance angle ₍ b ₎ is ensured in the endless track between the idler ₍ 7 ₎ and the other small-diameter wheel body ₍ 4 _). A crawler traveling device characterized by being present. 2. A large-diameter wheel ₍ 2 ₎ arranged near the center of gravity of the vehicle body ₍ 1 ₎ , small-diameter wheels ₍ 3 _{) (} 4 ₎ arranged before and after it, and a large-diameter wheel ₍ 2 ₎ and the other. Idler to be placed between the small diameter wheels ₍ 4 _)
(7) and the endless track ₍₅₎ of the multiplied Rotate configured claim 1, wherein the black - in La traveling device, the idler - ₍₇₎ close So設to the larger-diameter ring _(2), the idler − ₍ 7 ₎ and large diameter wheel ₍
2 ₎ and the driven protrusion ₍ 5 ₎ formed on the inner peripheral side of the endless track ₍ 5 _).
8 _{) A} crawler traveling device characterized in that it engages with the inner and outer sides of the gear.