JPH1059229A - Slewing working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move the equilibrium point in front and rear to the outside of a running device when a bucket is directed to the direction orthogonal to the advancing direction of the running device so as to lighten a balance weight by making the core projecting part of a crawled to be eccentric outside the right and left center position of the crawler. SOLUTION: The width of a crawler is made small, the core projecting part 1a of a rubber crawler 1 forming an equilibrium fulcrum P1 is moved outside compared with the case of a rubber crawler 1 of large width, and hence the equilibrium fulcrum P1 is moved outside a equilibrium fulcrum P in the case of the rubber crawler of large width. Hereby, the distance a2 between the center of gravity on the bucket side and the equilibrium fulcrum P is made small, the distance b2 between a balance weight W2 and the equilibrium point P is made large, and hence the weight of the balance weight W2 is made light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a traveling device of a turning work vehicle such as a backhoe.

[0002]

2. Description of the Related Art Conventionally, a technique relating to the crawler shape of a crawler type traveling apparatus has been known. For example, JP-A-8-99656 and JP-A-8-7275
No. 9, JP-A-8-85482, JP-A-8-5
No. 3079, JP-A-8-91256, JP-A-8-58647, JP-A-8-85480,
This is as in JP-A-8-104262.

[0003] Conventionally, a turning work vehicle such as a backhoe has been configured as shown in FIG. That is,
When the work machine such as the revolving unit F and the bucket is turned in a direction orthogonal to the traveling direction of the traveling device K by 90 degrees, the rear end of the revolving unit projects beyond the width of the left and right traveling devices K. It was.

Therefore, as shown in FIG. 5, when transporting a turning work vehicle to a work site, the turning work vehicle is carried on a carrier 2 of a small dump truck T that can be operated with a normal license such as a 2-ton dump or a 4-ton dump. However, even if the bucket and the revolving structure are swung while being placed on the loading platform 2, the balance weight W1 provided at the rear of the revolving structure projects rearward from the traveling device K, and the side of the bucket 4 and the balance weight W1
From the portion of the core bar projection 1a of the crawler 1 (balanced fulcrum P), which is a fulcrum of balance with the
Since the distance from the balance weight W1 to the center of gravity, a1 to b1, b1 is large, the weight of the balance weight W1 is balanced with respect to the bucket 4 and the bucket arm 5. Therefore, even if the balance weight W1 is lightened, no problem occurs, and the bucket 4 does not bow and the turning work vehicle does not fall from the carrier 2 without any trouble.

However, as shown in FIG. 3, in order to improve the workability in a narrow place, the rear part is made circular, and the rear part circle is arranged within the width of the left and right traveling devices K, and the revolving unit F is turned. However, in the case of a small-slewing-type swing work vehicle configured to at least allow the rear part of the swing body F to come out of the swing body F, when the swing body F is mounted on the bed 2 of the dump truck T, the swing body F rotates. Then, the balance with the balance weight W2 is lost due to the weight of the bucket 4 and the bucket arm 5, so that the bucket 4 side falls and the turning work vehicle falls from the bed 2 to occur.

In order to prevent the bed 2 from dropping to the bucket 4 in the state shown in FIG. 3, the balance weight W2 needs to be large. When the turning work vehicle of the type shown in FIG. 5 is compared with the turning work vehicle of the type shown in FIG. 3, the turning work vehicle shown in FIG. 3 has good turning performance and work performance, but the balance weight W2 is larger than the balance weight W1. As a result, the overall weight becomes heavy, which causes a problem that the excavation performance is reduced and the price is increased.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a turning work vehicle, such as a bucket 4 or the like, which does not fall to the bucket 4 side even when it is placed on the bed 2 of a dump truck T as shown in FIG. The core metal projection 1a of the crawler 1, which is the balance fulcrum P between the work machine side and the balance weight W2 side, is positioned as far outward as possible.
The distance a2 from “a” to the center of gravity of the bucket 4 is shortened, and the distance b2 from the cored bar projection 1a to the center of gravity of the balance weight W2 is increased to minimize the balance weight W2. .

[0008]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. The turning work vehicle according to claim 1, wherein a traveling device is disposed at a lower portion, a revolving body F is disposed at an upper portion, and a working machine that is rotatable up and down is provided on the revolving body F. The core metal projection 1a of the crawler 1 constituting the traveling device K is decentered outward from the left and right center position of the crawler 1.

According to a second aspect of the present invention, a traveling device is disposed at a lower portion, a revolving unit F is disposed at an upper portion, and a work machine which is rotatable up and down is provided on the revolving unit F. In the work vehicle, the core metal projection 1a of the crawler 1 constituting the traveling device K is eccentric to the outside from the left and right center position of the crawler 1, and a steel cord as a reinforcing member of the crawler 1 is sandwiched between the core metal projection 1a. Approximately the same number is arranged on the left and right.

According to a third aspect of the present invention, the traveling device is disposed at a lower portion, a revolving unit F is disposed at an upper portion, and a working machine which is rotatable up and down is provided on the revolving unit F. In the work vehicle, the core metal projection 1a of the crawler 1 constituting the traveling device K is eccentric to the outside from the left and right center positions of the crawler 1, and the area of the lug 1b of the crawler 1 is reduced to the core metal projection 1a.
And the left and right sides thereof have substantially the same area.

According to a fourth aspect of the present invention, a traveling device is disposed at a lower portion, a revolving unit F is disposed at an upper portion, and a work machine which is rotatable up and down is provided on the revolving unit F. In the working vehicle, the core metal projection 1a of the crawler 1 constituting the traveling device K is eccentric to the outside from the left and right center positions of the crawler 1, and the shape of the lug 1b of the crawler 1 is changed to the core metal projection 1a.
The left and right crawlers 1 can be used symmetrically with respect to the left and right.

According to a fifth aspect of the present invention, a traveling device is disposed at a lower portion, a revolving unit F is disposed at an upper portion, and a work machine which is rotatable up and down is provided on the revolving unit F. In the working vehicle, at the lateral end of the core metal of the crawler 1 constituting the traveling device K, between the adjacent front and rear crawlers 1,
This constitutes a cored bar connecting portion.

[0013]

Next, an embodiment of the present invention will be described. 1 is an overall side view of a turning work vehicle of the present invention, FIG. 2 is an overall plan view of the turning work vehicle, and FIG. 3 is a rear view of the turning work vehicle of the present invention mounted on a bed 2 of a dump truck T. FIG. 4 is a drawing showing a change in the position of the balance equilibrium fulcrum P when the position of the metal core projection 1a of the crawler 1 is changed;
FIG. 5 shows a conventional turning work vehicle, in which a backhoe whose rear portion of a turning body F projects from within the width of the traveling device K is mounted on a dump truck T.
FIG. 6 is a plan view of a configuration in which the lug 1b of the crawler 1 is point-symmetric with respect to the center of rotation O, and FIG. 7 is another embodiment in which the lug 1b is also point-symmetric. FIG.

FIG. 8 is a plan view showing a configuration in which the lugs 1b of the crawler 1 have the same area on the left and right with respect to the cored bar 1a.
FIG. 9 is a view showing a state in which the core metal projection 1a is eccentric in the rubber track 1, and FIG. 10 is a view showing a configuration in which the engagement projection 11a is eccentric in the iron crawler 11.
1 is a cross-sectional view showing a structure in which the same number of steel cords 17 arranged for reinforcement inside the crawler 1 are provided on the left and right sides of the cored bar projection 1a. FIG.
FIG. 13 is a diagram showing a configuration in which an engagement protrusion 12 is protruded forward and backward from a metal core, and a fitting recess 13 is provided in the metal core of the adjacent rubber track 1 before and after the rubber crawler 1 to be integrally connected.
Is a cross-sectional view showing the effect when the rubber track 1 is connected back and forth by the engagement protrusion 12 and the fitting recess 13, and FIG. 14 is a drawing showing the configuration of the rolling wheel 18 and the engagement protrusion 11a in the iron crawler 11. .

Referring to FIGS. 1 and 2, the entire construction of the turning work vehicle according to the present invention will be described. Crawler type traveling device K
Is supported by a track frame G, and the track frame G
A swivel table bearing 7 is arranged at the center of the swivel table F. The swivel table bearing 7 supports the revolving unit F so as to be revolvable. On one side of the track frame G, between the left and right traveling devices K, an earth discharging plate Y is arranged so as to be vertically rotatable.

On the revolving superstructure F, a hood B covering the engine and a canopy N arranged on the driver's seat S are provided. At the front of the revolving unit F, a base of the main boom 6 is pivotally supported so as to be vertically rotatable and swingable right and left. The bucket arm 5 is pivotally supported at the tip of the main boom 6, and the bucket 4 is pivotally supported at the tip of the bucket arm 5. The main boom 6 rotates with the main boom cylinder 23, the bucket arm 5 rotates with the bucket arm cylinder 5, and the bucket 4 rotates with the bucket cylinder 24.

In the turning work vehicle according to the embodiment of the present invention,
In consideration of excavation work in a narrow open field, the entire turning work vehicle is configured to be small, a traveling device is disposed at a lower portion, a revolving structure F is disposed at an upper portion, and A work machine that is rotatable up, down, left, and right is provided on the upper side, and at least a portion behind the center of rotation is configured to be within the width of the left and right traveling devices K. Bearing 7
Is formed in an arc centered on the turning center O of the revolving unit F, and even if the revolving unit F turns, the revolving unit F is within the width of the left and right traveling devices K.
Since the rear part does not protrude, there is no danger of the revolving superstructure F colliding with an obstacle. In addition, as a turning work vehicle, the invention can be applied to a standard machine, a micro turning machine, and the like, and is an effective invention.

If the front part of the revolving unit F is also formed as an arc so as not to protrude from the left and right widths of the traveling device K, it is more secure. The pivot base of the main boom 6 needs to be formed near the center of the revolving unit F. In this state, the swinging of the bucket 4 can be performed by swinging between the bucket arm 5 and the main boom 6. It is necessary to provide a separate arm, which increases the weight of the working machine and further degrades the balance.

In the case of the small turning type turning work vehicle according to the present invention, only the rear side is formed into an arc centered on the turning center O, and the front portion of the revolving unit F is located within the width of the traveling device K. Although the base of the main boom 6 protrudes slightly, the operator constantly monitors the front, so that the front does not collide with an obstacle when turning. As described above, in the case where the rear portion of the revolving structure F can be turned within the width of the traveling device K,
As shown in FIG. 3, when the dump truck T is placed on the bed 2, the amount of protrusion of the revolving structure F toward the rear is small, so that the balance up to the balance weight W2 is compared with the distance a2 from the center of gravity of the bucket 4. If the distance b2 from the fulcrum P becomes shorter and the balance weight W2 is balanced so that the turning work vehicle does not fall at the balanced fulcrum P while maintaining the ratio of the distance between a2 and b2, the balance weight W2 becomes 5 is considerably heavier than in the case of FIG.

In the case of a turning work vehicle such as a backhoe, the working capacity is determined by the capacity of the bucket 4.
5 and FIG. 5, the capacity of the bucket 4 is the same. The width of the right and left sides of the traveling device K is also the same, and it is a model that can be mounted on the same 4-ton dump truck T. However, the small turning type turning work vehicle of the present invention is heavier and more expensive, The heavier the weight, the more horsepower is taken there. As shown in FIG. 3 and FIG. 5, by mounting the turning work vehicle on a very narrow carrier 2 of the dump truck T, a state in which the balance is lost on the side of the bucket 4 occurs. If the loading platform 2 is made large and the turning vehicle is placed at the center position,
Although it does not cause much problem, it is configured so that it can be mounted just barely by a 4-ton dump truck T which can be usually boarded with a normal license, and the small turning type turning work vehicle of the present invention is used for sewerage work etc. Since the dump truck T is used in a small-scale construction company that excavates an open field, the dump truck T is often used with a minimum capacity and is mounted with a turning work vehicle at the very limit. Even when not mounted on the dump truck T as described above, when excavation work is performed in a state perpendicular to the traveling device K when working on the ground, the center of gravity shifts to the bucket 4 side, and the balance weight W2 side rises. Failures can occur. In order to solve this problem, it is an object of the present invention to reduce the weight of the balance weight W2 while keeping the advantage of the small turning, and to reduce the weight to about the same as the turning work vehicle of FIG.

For this reason, in the present invention, the bucket 4
The balance fulcrum P on the side of the balance weight W2 and the fulcrum P of the balance weight W2 are moved to the outside of the loading platform 2 as much as possible, and a2
Is made smaller and b2 is made larger. As described above, as a method of moving the equilibrium fulcrum P outward, there is a method of reducing the crawler belt width as shown in FIG. As a result, the portion of the core metal protrusion 1a of the rubber crawler 1 that forms the balance fulcrum P moves outward more than in the case of the wide rubber crawler 1, so that the balance fulcrum P1 is replaced with the normal wide crawler 1 It can be moved outside the equilibrium fulcrum P in that case.

Further, in the present invention, while the width of the rubber crawler 1 is kept narrow, the position of the metal core protrusion 1a is eccentric to the outside, so that the equilibrium fulcrum P2 is moved outside of P1. Thereby, the distance a2 is shortened and the distance b2
Is lengthened, and even if the balance weight W2 is light, there is no possibility that the aircraft will fall on the bucket 4 side.

FIG. 9 shows the rubber crawler 1 in a state where the portion of the metal core protrusion 1a is eccentric to the outside. FIG. 9 shows the positional relationship among the idler 9, the drive hydraulic motor 3, the drive sprocket 8, the rolling wheels 10, and the rolling wheel frame 14 in a state where the core metal projection 1a of the rubber crawler 1 is eccentric. FIG. 10 shows an embodiment in which, in the case of the iron crawler 11, the engaging projection 11a is decentered outward and the position of the balance fulcrum P is moved outward. FIG. 10 shows the relationship between the iron crawler 11, the drive sprocket 8, the idler 9, and the rolling wheel 10. As shown in FIG. Although the present invention has mainly been described with respect to the rubber crawler 1 as an example, the present invention can also be applied to a turning work vehicle using an iron crawler 11 as shown in FIG.

As described above, when the metal core protrusion 1a is eccentric to the outside in the rubber track 1, the metal core protrusion 1a
Since the position “a” is not symmetrical, the left and right rubber crawlers 1 may not be able to use the same components. In order to solve this problem, in the present invention, as shown in FIGS. 6 and 7, the left and right rubber crawlers 1 are configured to be point-symmetric with respect to the turning center O of the turning table bearing 7. As a result, the left and right rubber crawlers 1 can be used as common components, and the cost can be reduced.

As shown in FIG. 8, if the grounding force is different from the core metal projection 1a eccentric to the left and right, there is a possibility that the rubber crawler 1 cannot fully exert the grounding force. In the present invention, in order to solve this problem, the lugs 1b and 1b have the same area on the left and right sides of the core bar projection 1a.

Similarly, the core metal protrusion 1a is
Therefore, the steel cords 17 having the same width and the same number of steel cords 17 cannot be arranged symmetrically as in the related art. In the present invention, the number of the left and right steel cords 17 is the same, the arrangement interval is made different between the left and right, and the reinforcement strength by the steel cords 17 can be maintained.

In FIGS. 12 and 13, the rubber crawler 1 has a convex portion at an eccentric position as shown in FIG. 13. Even when riding on this, only one of the rubber crawler 1 does not bend. In this manner, an embodiment is shown in which the independent rubber crawlers 1 are connected to each other by the engagement projections 12 and the fitting recesses 13 provided at the left and right end portions to form a single bendable plate structure. . Thus, as shown in FIG. 13, even when the crawlers ride on a protrusion or a stone block at an eccentric position with respect to the rubber crawler 1, the rubber crawler 1 is not deformed one by one.

FIG. 14 shows the configuration of the rolling wheel 18 in the iron crawler 11. Conventionally, the side wheel portion of the rolling wheel 18 did not come into contact with the iron crawler 11, as in the uppermost configuration in FIG. In the present configuration, the left and right side wheel portions of the rolling wheel 18 are configured to have large diameters as shown in the center and lower parts of FIG. 14 so as to be able to contact the contact surface protruding from the upper surface of the iron crawler 11. Thereby, the iron crawler 11 is less likely to come off, and the durability can be improved.

[0029]

As described above, the present invention has the following advantages. As described in claim 1, since the core metal projection 1a of the crawler 1 constituting the traveling device K is decentered outward from the left and right center positions of the crawler 1, the bucket 4 is moved in a direction orthogonal to the traveling direction of the traveling device K. In this case, the front and rear balance fulcrum P can be moved to the outside of the traveling device K, and the distance b2 between the balance fulcrum P and the balance weight W2 can be increased. It became possible to make it lighter.

Since the steel cords 17 as reinforcing members of the crawler 1 are arranged on the right and left sides of the metal core projection 1a, approximately the same number of steel cords 17 are provided on the left and right sides of the metal core projection 1a. However, by arranging the same number of steel cords 17 in each of them, the strength of the rubber crawlers 1 on the left and right sides of the metal core projection 1a can be made equal, resulting in uneven wear and uneven load. Was eliminated.

According to a third aspect of the present invention, the core metal protrusion 1a of the crawler 1 constituting the traveling device K is eccentric to the outside from the left and right center position of the crawler 1, and the area of the lug 1b of the crawler 1 is reduced. Since the left and right sides have substantially the same area with respect to 1a, the supporting load can be made the same on the left and right sides of the core metal projection 1a with the same area of ground contact. As a result, uneven wear and uneven load could be eliminated.

As described in claim 4, the shape of the lug 1b of the crawler 1 is symmetrical with respect to the right and left points with respect to the core bar projection 1a, so that the right and left crawlers 1 can be used.
Is eccentric, it is necessary to configure the left and right rubber crawlers 1 as separate parts. However, in the case of the present invention, the left and right rubber crawlers 1 can share the same parts,
The cost is lower.

According to the fifth aspect, at the side end of the core metal of the crawler 1, a core metal connecting portion is formed between the adjacent front and rear crawlers 1, so that the rubber crawlers 1 are integrated in the running state. It can be made into a flexible plate shape that is connected to each other, and when riding on a stone block or obstacle eccentrically,
The endurance performance was improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a turning work vehicle according to the present invention.

FIG. 2 is an overall plan view of the turning work vehicle.

FIG. 3 is a rear view of the turning work vehicle of the present invention mounted on a bed 2 of a dump truck T.

FIG. 4 is a diagram showing a change in the position of a balance equilibrium fulcrum P when the position of a metal core protrusion 1a of the crawler 1 is changed.

FIG. 5 is a rear view of a conventional turning work vehicle, in which a backhoe having a rear portion of a revolving structure F protruding from within the width of a traveling device K is mounted on a bed 2 of a dump truck T.

FIG. 6 is a plan view of a configuration in which a lug 1b of the crawler 1 is point-symmetric with respect to a turning center O.

FIG. 7 is a plan view showing another embodiment in which the lugs 1b are point-symmetric.

FIG. 8 is a plan view showing a configuration in which the lugs 1b of the crawler 1 have the same area on the left and right with respect to the core bar projection 1a.

FIG. 9 is a view showing a state in which the core metal projection 1a is eccentric in the rubber track 1;

FIG. 10 shows the engagement protrusion 11a of the iron crawler 11.
The figure which shows the structure which decentered.

FIG. 11 is a cross-sectional view showing a configuration in which the same number of steel cords 17 arranged inside the crawler 1 for reinforcement are provided on the left and right of the cored bar projection 1a.

FIG. 12 shows a rubber crawler 1 in which engaging protrusions 12 protrude forward and backward from a metal core, and fitting recesses 13 are provided in the metal cores of the adjacent rubber crawlers 1 to connect the rubber crawlers 1 integrally. Drawing showing composition.

FIG. 13 is a cross-sectional view showing an effect when the rubber track 1 is connected to the front and rear by an engagement protrusion 12 and a fitting recess 13;

FIG. 14 is a drawing showing a configuration of a rolling wheel 18 and an engagement protrusion 11a in the iron crawler 11.

[Explanation of symbols]

 B Bonnet F Revolving body K Traveling device P Balance fulcrum O Center of rotation T Dump truck 1 Rubber crawler 1a Core protrusion 1b Lug 2 Loading bed 3 Drive hydraulic motor 11 Iron crawler

Claims (5)

[Claims] 1. A turning work vehicle having a configuration in which a traveling device is disposed at a lower portion, a revolving body F is disposed at an upper portion, and a working machine that is rotatable up and down is provided on the revolving body F. A turning work vehicle characterized in that a core metal projection 1a of a crawler 1 constituting a traveling device K is decentered outward from a left-right center position of the crawler 1. 2. A turning work vehicle having a configuration in which a traveling device is disposed in a lower portion, a revolving body F is disposed in an upper portion, and a working machine that is vertically rotatable is provided on the revolving body F. The metal core projection 1a of the crawler 1 constituting the traveling device K is eccentric to the outside from the left and right center positions of the crawler 1, and the steel cord 17 as a reinforcing member of the crawler 1 is attached to the core metal projection 1
A turning work vehicle, wherein substantially the same number of the turning work vehicles are arranged on the left and right sides of the vehicle. 3. A turning work vehicle having a configuration in which a traveling device is disposed at a lower portion, a revolving unit F is disposed at an upper portion, and a working machine that is vertically rotatable is provided on the revolving unit F. The core metal projection 1a of the crawler 1 constituting the traveling device K is eccentric to the outside from the left and right center positions of the crawler 1, and the area of the lug 1b of the crawler 1 is substantially the same on the left and right across the core metal projection 1a. A turning work vehicle, characterized in that: 4. A turning work vehicle having a configuration in which a traveling device is disposed at a lower portion, a revolving body F is disposed at an upper portion, and a working machine which is vertically rotatable is provided on the revolving body F. The core metal projection 1a of the crawler 1 constituting the traveling device K is decentered outward from the left and right center position of the crawler 1, and the shape of the lug 1b of the crawler 1 is symmetrical with respect to the left and right points across the core metal projection 1a. A turning work vehicle characterized in that the left and right crawlers 1 can be shared. 5. A turning work vehicle having a configuration in which a traveling device is disposed at a lower portion, a revolving unit F is disposed at an upper portion, and a working machine which is vertically rotatable is provided on the revolving unit F. At the lateral end of the core metal of the crawler 1 constituting the traveling device K,
A turning work vehicle, comprising a cored bar connecting portion between adjacent front and rear crawlers 1.