JP2000095159A - Tracked vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stable running performance even when running on rough or icy road surface. SOLUTION: A cylinder member 18 is inserted into a drive shaft 12 of a front axle device 9. A boss portion 19A of a rocking bracket 19 is installed to the outer periphery of the cylinder member 18 so as to allow relative rotating motion. A plurality of turning wheels 21 are installed to the rocking bracket 19 and a driving wheel 22 is integrated to the leading end of the drive shaft 12 such that a rubber crawler 29 is wound between the turning wheel 21 and the driving wheel 22. A plurality of lugs 30A are formed on the rubber crawler 29, which are spaced from one another along the length thereof. The leading end surface 30B of the lug 30A is provided with an anti-slip bar 34 formed of a substantially U-shaped metal bar. Both ends of the anti-slip bar 34 are fixed to the rear surface of the rubber crawler 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracked vehicle used for a construction machine such as a hydraulic excavator.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracked vehicle that is suitably used for traveling on uneven terrain.

[0002]

2. Description of the Related Art In general, a crawler belt device used for a tracked vehicle such as a hydraulic shovel is, for example, an axle housing provided on a vehicle body at a distance before and after the vehicle body, and a rotatable device inside the axle housing. Before being inserted through
A rear drive shaft, and provided to be swingable around the drive shaft,
There is known an apparatus having crawler devices before and after traveling by the drive shaft (Japanese Patent Application Laid-Open No. 4-244489,
JP-A-4-8682, JP-A-64-29082 and the like.

In this type of prior art, for example, when traveling on a rough road surface having unevenness, the front and rear crawler devices respectively swing about a drive shaft in accordance with the inclination of the road surface, so that the crawler device is rotated. Can always be widely contacted with the road surface, and stable running performance can be obtained.

Here, as a crawler belt used for the crawler belt device, for example, a crawler belt using a rubber crawler 101 shown in FIG. 17 is known. The rubber crawler 101 has a plurality of lugs 101A on the grounding surface side thereof, the lugs 101A being spaced apart in the length direction of the rubber crawler 101 and projecting in the thickness direction.
Are formed.

[0005] Such a rubber crawler 101 has advantages in that, as compared with an iron crawler, it does not damage the pavement road surface during traveling, and further, it can reduce the impact received from the road surface and improve the running performance.

[0006]

In the tracked vehicle according to the prior art described above, when traveling on a relatively soft road surface such as muddy ground, the lug 101A of the rubber crawler 101 is attached to the road surface as shown in FIG. The lug can be deeply digged in, and a stable running property can be obtained by the grip force of the lug 101A at this time.

However, when traveling on a frozen road surface during running on a frozen ground or the like or during snow removal work, only the tip end surface of the lug 101A of the rubber track 101 comes into contact with the road surface as shown in FIG. Then, in this state, the frictional force of the lug 101A on the frozen road surface is significantly reduced, so that a slip easily occurs between the contact surface between the lug 101A and the road surface. Especially when water is present on the road surface,
There is a problem that the frictional force generated between the contact surfaces with the contact surface 01A becomes extremely small, and the slip easily occurs.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention is intended to obtain a stable traveling performance even when riding over a rugged road surface or running on a frozen road surface. It is an object of the present invention to provide a tracked vehicle that can be moved.

[0009]

In order to solve the above-mentioned problems, a tracked vehicle according to the present invention is provided in front of a vehicle body.
An axle housing provided on the vehicle body at a distance afterward, a front and rear drive shaft rotatably inserted into the axle housing, and a swing shaft provided around the drive shaft; A crawler device before and after traveling by the drive shaft, wherein the crawler device is provided so as to be relatively rotatable around the drive shaft, and a swing bracket that swings around the drive shaft; A rolling wheel rotatably provided on the swing bracket, a driving wheel provided around the tip of the drive shaft, a rubber crawler wound between the rolling wheel and the driving wheel, and the rubber crawler And a slip prevention member made of a metal member provided on the ground contact side of the rubber crawler to prevent the slippage.

[0010] With this configuration, when traveling on an uneven road surface, the crawler belt device swings around the drive shaft in accordance with the inclination of the road surface, so that the rubber crawler is broadly in contact with the road surface. , Stable running can be obtained. In addition, since a slip prevention member made of a metal member is provided on the surface of the rubber crawler, when traveling on a frozen road surface, the slip prevention member can be made to bite into the frozen road surface, and the grip force of the slip prevention member at this time. This can prevent the rubber track from slipping.

According to the second aspect of the present invention, the anti-slip member is detachably attached to the rubber track.

[0012] With this configuration, when traveling on a pavement road or the like, the traveling can be performed with the anti-slip member removed from the rubber crawler, whereby the rubber crawler can be directly contacted with the road surface. The resulting damage and the like can be reduced.

According to the third aspect of the present invention, a plurality of lugs are formed on the surface of the rubber track so as to be spaced apart from each other in the length direction of the rubber track and have tips projecting in the thickness direction of the rubber track. The prevention member is configured to be attached to the tip of each lug.

With this configuration, when traveling on a relatively soft road surface such as muddy ground, a plurality of lugs provided on a rubber crawler can be deeply cut into the road surface. The rubber track can be prevented from slipping. In addition, since the slip prevention member is provided at the tip end side of each lug, when traveling on a frozen road surface, the lug can strongly push the slip prevention member against the road surface so that the slip prevention member can bite into the road surface.

Further, in the invention of claim 4, the rubber crawler is provided with a through-hole penetrating from the front side to the back side of the rubber crawler, and the slip preventing member is inserted into the through-hole and the rubber crawler is provided. It has a fastening portion to be fastened on the back side.

With this configuration, the slip prevention member can be easily fixed to the rubber track by the fastening portion provided on the slip prevention member.
Further, since the fastening portion of the slip prevention member can be fastened at the position on the back surface side of the rubber crawler, the fastening portion side can be protected from the impact of earth and sand during traveling.

Further, in the invention according to claim 5, the anti-slip member is a metal bar extending along the width direction of the crawler belt.

[0018] With this configuration, the slip prevention member can be easily formed using a metal rod.

On the other hand, in the invention of claim 6, the slip prevention member is a metal plate extending along the width direction of the rubber track.

According to this structure, the slip prevention member can be easily formed using a metal plate as in the case of the fourth aspect.

Further, in the invention according to claim 7, the anti-slip member is a rivet having a head portion having a diameter larger than the diameter of the through hole, and the rivet has the head portion on the surface side of the rubber crawler. It is inserted into the through hole in the engaged state.

With this configuration, the slip prevention member can be easily formed by using a rivet as in the case of the fourth aspect.

Further, according to the invention of claim 8, the uneven pattern is formed in the portion of the slip prevention member that comes into contact with the road surface.

[0024] With this configuration, the surface pressure of the slip prevention member against the road surface can be increased by the uneven pattern, and the slip prevention member can be more deeply cut into the frozen road surface.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which a tracked vehicle according to an embodiment of the present invention is applied to a hydraulic shovel will be described.
This will be described in detail with reference to the accompanying drawings.

FIG. 1 to FIG. 7 show a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a body of a hydraulic shovel. The body 1 includes a front body 2 provided with a later-described working device 8 and a front crawler device 17 and a connecting device provided with a rear crawler device 36 described later. 3 and a rear vehicle body 4 connected to the front vehicle body 2 via the rear vehicle body 3. A machine room (both not shown) for accommodating a prime mover, a hydraulic pump, and the like is defined inside the rear body 4, and a driver's seat 5 and a steering wheel 6 are provided above the rear body 4. Etc. are provided.

A steering cylinder 7 is provided between the front vehicle body 2 and the rear vehicle body 4 so as to extend and retract by a handle 6. It is configured to swing left and right with respect to the vehicle body 2 to control the traveling direction of the vehicle body 1.

Reference numeral 8 denotes a working device provided on the front side of the front vehicle body 2 so as to be able to move up and down.
A, bucket 8B, etc.
A and the bucket 8B are operated by a lift cylinder 8C and a bucket cylinder 8D, respectively.

Reference numeral 9 denotes a front axle device provided on the lower side of the front vehicle body 2. The front axle device 9 includes an axle housing 10, a drive shaft 12, and the like, which will be described later. The crawler belt device 17 is driven to run by a motor.

The rear vehicle body 4 is also provided with a rear axle device (not shown) having substantially the same configuration as the front axle device 9, and the rear axle device includes an axle housing, a drive shaft, and the like.

An axle housing 10 constitutes an outer frame of the front axle device 9.
Numeral 0 is formed as a rectangular cylinder extending leftward and rightward as shown in FIG. 3, and the drive shaft 12 is inserted therein. Further, a differential gear 11, a speed reducer, a traveling brake device (all not shown), and the like are provided in an intermediate portion in the longitudinal direction of the axle housing 10.

Reference numeral 12 denotes a front drive shaft as a drive shaft rotatably inserted into the axle housing 10. The drive shaft 12 extends in the axle housing 10 in the axial direction as shown in FIG. The base end includes left and right first shaft portions 13 connected to the differential gear 11 side, and left and right second shaft portions 14.

Here, as shown in FIG. 4, the first shaft portion 13 is formed with a stepped disk-shaped flange portion 13A at the tip end protruding from the axle housing 10 to the outside.
Further, the second shaft portion 14 is formed in a stepped cylindrical shape, and is fastened by a plurality of bolts 15 and the like in a state where the base end side is fitted to the flange portion 13A of the first shaft portion 13. The drive shaft 12 is configured to transmit driving force from a hydraulic motor on the rear vehicle body 4 side to driving wheels 22 described later.

Reference numeral 16 denotes the second shaft portion 1 of the drive shaft 12.
4 is a disk-shaped spacer provided by being inserted into the crawler device 4.
Is suppressed between the stopper plate 26 and the stopper plate 26 described later.

Reference numerals 17 and 17 denote front crawler devices which are provided at the left and right sides in the axial direction of the front axle device 9 and are swingably provided around the drive shaft 12. It is slidably inserted around the two shafts 14 and is provided with a cylindrical member 18, a swing bracket 19 described later, a rolling wheel 21, a driving wheel 22, a rubber crawler 29, and the like. It is driven. Here, the driving wheel 22 is fastened to one end side of the cylindrical member 18, and relatively rotates around the second shaft portion 14 integrally with the driving wheel 22.

Reference numeral 19 denotes the second shaft portion 1 of the drive shaft 12.
The swing bracket 19 is provided so as to be swingable around the perimeter 4. The swing bracket 19 is formed as a frame structure by welding a plurality of plates and the like to each other as shown in FIGS.

Here, the swing brackets 19 are disposed to be separated from each other to the left and right, and have substantially triangular standing plates 19B, 19B to which a boss 19A is fixed on the upper side.
A horizontal plate 19C fixed to the lower end of B and extending horizontally in the front and rear directions, and brackets 19D and 1 fixed to the lower surface of the horizontal plate 19C and separated to the left and right, and to which the rolling wheels 21 are attached.
9D. The oscillating bracket 19 has a boss 19 </ b> A supported by each bearing body 20 so as to be rotatable relative to a cylindrical member 18 provided on the drive shaft 12.

Are rotating wheels provided between the brackets 19D of the oscillating bracket 19 so as to be spaced downward from the driving wheels 22. The respective rolling wheels 21 are The rubber crawler 29 is guided on the lower side.

Reference numeral 22 denotes a driving wheel provided around the second shaft portion 14 of the drive shaft 12 together with the cylindrical member 18. The driving wheel 22 has an inner peripheral side at the tip end side of the second shaft portion 14 as shown in FIG. It comprises a hub 23 attached by spline connection and a sprocket 24 integrally provided on the outer peripheral side of the hub 23. Then, the hub 23 of the drive wheel 22
Is fixed to one end of the cylindrical member 18 by a plurality of bolts 25.

Reference numeral 26 denotes a drive wheel 22 connected to the drive shaft 12.
The stopper plate 26 is fastened to the end of the second shaft portion 14 by a bolt 27 or the like. Also, 28
Is a protective cover fastened to the hub 23 of the drive wheel 22. The protective cover 28 protects the bolts 25 and 27, the stopper plate 26 and the like from impacts such as earth and sand.

Reference numeral 29 denotes a rubber crawler wound between each of the rolling wheels 21 and the driving wheel 22. The rubber crawler 29 is a belt-shaped endless belt made of an elastic resin material as shown in FIGS. The formed rubber body 30 and a core metal 3 described later
2. It is constituted by a reinforcing band 33, a slip prevention bar 34 and the like.

Here, the rubber body 30 is integrally formed with a plurality of lugs 30A which are located on the surface side serving as the grounding surface and whose tips project in a substantially rectangular shape in the thickness direction of the rubber body 30. ing. The lugs 30 </ b> A are elongated in the width direction of the rubber body 30, and are arranged parallel to each other at a certain interval in the length direction of the rubber body 30. As a result, the lug 30A gives a gripping force (driving force for traveling) to a vehicle such as a hydraulic shovel when it comes into contact with a road surface as described later.

Also, every other lug 30A has an anti-slip bar 34, which will be described later, on the distal end surface 30B.
A mounting groove 30 </ b> C to which is mounted is formed. The mounting groove 30C is formed as a semi-circular concave curved groove that is elongated in the width direction of the rubber body 30, and holds the anti-slip bar 34 in a state of being positioned with respect to the lug 30A. I have.

Each of the rubber members 30 is provided with a through hole 30D at every other lug 30A in the width direction similarly to the mounting groove 30C, and the through hole 30D has one end thereof. Side is opened in the mounting groove 30C, and the other end side is the rubber body 30.
Is open on the back side.

Further, in the rubber body 30, square holes 31, 31,...
The square holes 31 allow the mud to be discharged between the lugs 30A on the front side when mud or the like enters the back side of the rubber body 30 during traveling on the road.

Reference numeral 32 denotes a plurality of metal cores 32 buried in the rubber body 30 so as to be parallel to each other with a predetermined interval.
The core bar 32 is integrally formed with a pair of projections 32A, 32A that are separated to the left and right and protrude from the back side of the rubber body 30. Each of the projections 32A engages with the sprocket 24 of the drive wheel 22 to prevent the rubber crawler 29 from coming off the sprocket 24.

Reference numeral 33 denotes a plurality of reinforcing bands buried in the rubber body 30 together with the respective cores 32.
Are made of a braided rigid wire or the like that extends in the longitudinal direction of the rubber crawler 29 to increase the rigidity of the rubber crawler 29 as a whole.

Numeral 34 denotes an anti-slip bar as an anti-slip member which is detachably provided for every other lug 30A tip end surface 30B of the rubber crawler 29. The anti-slip bar 34 is a hard metal rod. It is formed as shown in FIGS. 4 to 7 by being bent in a substantially U-shape.

Here, the anti-slip bar 34 is
0A is fitted in the mounting groove 30C, and the tip surface 3
Grip part 3 which projects partly from 0B and touches the road surface
4A and a fastening portion 34 which is bent substantially in an L-shape from both ends of the grip portion 34A and is inserted through the through hole 30D.
B, 34B. In addition, fastening part 3
4B is a rubber body 3 having two nuts 35 on the tip side.
0 is integrally fastened to the back side.

The anti-slip bar 34 applies a gripping force to the hydraulic excavator when the grip portion 34A comes into contact with the road surface together with the lug 30A, as described later, to prevent the rubber crawler 29 from slipping.

Reference numeral 36 denotes a rear crawler device located on the lower side of the rear vehicle body 4 and separated from the left and right sides of the rear axle device so as to be swingable around the drive shaft. 1, also includes a swing bracket 37, a rolling wheel 38, a driving wheel 39, a rubber crawler 40, and the like, like the front crawler belt device 17 as shown in FIG. The rubber crawler 40 is also provided with a plurality of lugs separated from each other in the length direction similarly to the rubber crawler 29. For example, every other lug is provided on every other slip prevention bar (neither is shown). Are provided integrally.

The hydraulic shovel according to the present embodiment has the above-described configuration, and the crawler device 1 travels on a road.
The drive wheels 22 and 39 of the drive wheels 7 and 36 are driven to rotate by a hydraulic motor or the like, so that the rubber crawlers 29 and 40 are caused to orbit between the respective rolling wheels 21 and 38 and the drive wheels 22 and 39, respectively, and Drive the vehicle.

Here, in the present embodiment, the crawler device 1
Since the front and rear drive shafts 7 and 36 are provided so as to be able to swing, respectively, the crawler belt devices 17 and 36 swing around the drive shaft 12 when going over a rough road surface. Thereby, the rubber crawlers 29 and 40 can always be widely grounded on the road surface, and the traveling performance can be improved.

When deposits such as earth and sand are loaded on the truck, the bucket 8B is
Is lowered to a lower position.
The earth and sand are taken into the bucket 8B by driving the buckets 7 and 36 and pushing the bucket 8B forward. Then, by lifting the bucket 8B by the lift arm 8A in this state, earth and sand are loaded on the truck.

When the loading operation is performed on relatively soft ground such as muddy ground, the rubber track 29,
Since the ground 40 can always be widely grounded on the road surface, the ground pressure of the rubber crawlers 29 and 40 can be reduced, slippage as described in the related art can be prevented, and the traveling performance can be improved.

Moreover, at this time, the rubber track 2
Since the lugs 30A and the like provided on the wheels 9 and 40 can be deeply cut into the road surface, slip can be prevented by the grip force of the lugs 30A at this time, and the traveling performance can be further improved.

By the way, when traveling on a frozen road surface at the time of traveling on a frozen ground or during snow removal work, the rubber track 2
Since the frictional force between the lug 30A of No. 9 and the road surface is remarkably reduced, a slip easily occurs between the two. Especially when there is water on the road surface, the frictional force becomes extremely small,
Further, slip is likely to occur.

Therefore, in the present embodiment, a slip prevention bar 34 made of a metal member is integrally attached to the tip surface 30B of each lug 30A protruding from the rubber crawler 29. Thus, when traveling on a frozen road surface as described above, the lug 30A strongly presses the anti-slip bar 34 against the road surface, so that the anti-slip bar 34 can be deeply cut into the road surface as shown in FIG. And the anti-slip bar 34 at this time
It is possible to prevent the rubber crawler 29 from slipping due to the gripping force, and to improve the traveling performance.

Since the anti-slip bar 34 is provided so as to be detachable from the rubber crawler 29, the anti-slip bar 34 is previously removed from the rubber crawler 29 by the nut 35 when traveling on a paved road such as asphalt. By running the vehicle in a state in which the lug 30A is running, the entire tip surface 30B of the lug 30A can be widely grounded on the road surface. Then, the frictional force generated between the lug 30A and the road surface at this time can be transmitted to the hydraulic excavator as the grip force on the road surface, and the stable traveling performance can be obtained as in the case of the frozen road surface described above. Also, at this time, the lug 30A made of a rubber material can be brought into contact with the road surface, so that damage to the road surface can be reduced.

The fastening portion 34 of the anti-slip bar 34
B is fastened by the nut 35 at the position on the back side of the rubber crawler 29.
4B, the nut 35 and the like can be protected from impacts such as earth and sand. The nut 35 allows the anti-slip bar 34 to be stably mounted on the rubber crawler 29, thereby improving the reliability and the like of the device.

Further, since the anti-slip bar 34 is formed by using a substantially U-shaped metal bar, when forming the anti-slip bar 34, both ends of one elongated metal bar are bent. By applying, the anti-slip bar 34 can be easily formed, and workability at the time of processing can be improved.

Next, FIGS. 8 and 9 show a second embodiment of the present invention. The feature of this embodiment is that the anti-slip bar comprises a plurality of recessed grooves at a portion contacting the road surface. That is, an uneven pattern is formed. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 41 denotes a crawler device according to this embodiment. The crawler device 41 has substantially the same configuration as the crawler device 17 according to the first embodiment, and includes a rubber crawler 29 and a slip prevention bar 42 to be described later. have.

Reference numeral 42 denotes a slip prevention bar as a slip prevention member provided on the rubber crawler 29, instead of the slip prevention bar 34 described in the first embodiment.
The anti-slip bar 42 is formed in a substantially U-shape by a grip portion 42A and fastening portions 42B, 42B in substantially the same manner as the anti-slip bar 34 according to the first embodiment.

Here, two concave grooves 43, 43 and two other concave grooves 44, 44 are alternately formed in the grip portion 42A of the anti-slip bar 42 along the length direction of the grip portion 42A. Is provided. In addition, the concave grooves 43, 44
Extend in a direction opposite to each other with a constant inclination with respect to the length direction of the grip portion 42A.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment. Particularly, in the present embodiment, a plurality of recessed grooves 4 are formed on the surface of the grip portion 42A of the slip prevention bar 42.
Since the uneven pattern composed of 3, 44 is formed, the surface pressure of the grip portion 42A against the road surface can be increased by the recessed grooves 43, 44 when traveling on a frozen road surface, and the grip portion 42A is further deepened into the road surface. Can be made. As a result, the gripping force of the anti-slip bar 42 can be increased, and the traveling performance and the like can be further improved.

Next, FIGS. 10 to 12 show a third embodiment of the present invention.
This embodiment is characterized in that a lug of a rubber track is provided with a slip prevention plate as a slip prevention member. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes a crawler device according to the present embodiment. The crawler device 51 has substantially the same configuration as the crawler device 17 according to the first embodiment, and includes a rubber crawler 52 and a slip prevention plate 54 described later. have.

Here, the rubber crawler 52 is similar to the rubber crawler 29 according to the first embodiment in that the core metal 32,
The rubber body 53 is provided with a lug 53A and a through hole 53B. However, the mounting groove 30C according to the first embodiment is excluded from the distal end surface 53C of the lug 53A.

Reference numeral 54 denotes an anti-slip plate as an anti-slip member provided on the rubber crawler 52 instead of the anti-slip bar 34 described in the first embodiment. Rectangular plate portion 54A elongated along the width direction of
And the base end side of the plate portion 5
Fastening portions 54 fixed to both ends of 4A by welding or the like.
B, 54B.

The tip of the fastening portion 54B is fastened to the back surface of the rubber crawler 52 by a nut 35 or the like, with the plate portion 54A abutting against the tip 53C of the lug 53A of the rubber crawler 52. ing. Thus, the plate portion 54A of the slip prevention plate 54 constitutes a grip portion that gives a grip force to the hydraulic shovel when it comes into contact with the road surface.

Thus, also in the present embodiment configured as described above, the plate portion 54A of the slip prevention plate 54 provided on the rubber crawler 52 when traveling on a frozen road surface is used.
As shown in FIG. 11, it can be deeply cut into the road surface,
Almost the same effects as those of the first embodiment can be obtained.

Next, FIGS. 13 and 14 show a fourth embodiment of the present invention.
This embodiment is characterized in that a lug of a rubber track is provided with a slip prevention rivet as a slip prevention member. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 61 denotes a crawler device according to the present embodiment. The crawler device 61 has substantially the same configuration as the crawler device 17 according to the first embodiment, and includes a rubber crawler 62 and a slip prevention rivet 64 described later. have.

Here, the rubber track 62 is similar to the rubber track 29 of the first embodiment, and
The rubber body 63 is provided with a lug 63A and a through hole 63B. However, the mounting groove 30C according to the first embodiment is eliminated from the distal end surface 63C of the lug 63A.

Reference numeral 64 denotes an anti-slip rivet as an anti-slip member provided on the rubber crawler 29, instead of the anti-slip bar 34 described in the first embodiment.
A disk-shaped head 64A formed to have a larger diameter than the through-hole 63B by a certain dimension, and a fastening portion 64B inserted into the through-hole 63B and integrally formed with the head 64A on the base end side. Have been.

Then, the head 64A of the slip prevention rivet 64 has a lug 63A of the rubber crawler 62 and a tip surface 63C.
The front end of the fastening portion 64 </ b> B is fastened to the back surface of the rubber crawler 62 by the nut 35 in a state of being engaged with. Thereby, the head 64A of the slip prevention rivet 64 constitutes a grip portion that gives a grip force to the hydraulic shovel when it comes into contact with the road surface.

Thus, also in the present embodiment configured as described above, the head 64A of the anti-slip rivet 64 can be deeply cut into the road surface when traveling on a frozen road surface, which is almost the same as in the first embodiment. The operation and effect of the present invention can be obtained.

In the third embodiment, the surface of the plate portion 54A of the slip prevention plate 54 is described as being formed as a flat surface.
As in the modified example, the surface of the plate portion 71A of the slip prevention plate 71 is provided on the surface of the plate 71A in the same manner as in the second embodiment.
.. And a plurality of other recessed grooves 7
It is also possible to form a concavo-convex pattern consisting of 3, 73,.

Also, in the fourth embodiment, an uneven pattern may be formed on the surface of the head 64A of the slip prevention rivet 64 in the same manner as in the third embodiment.

Further, in each of the embodiments, the crawler belt device is provided with a driving wheel and four rolling wheels rotatably provided above and below the swinging bracket, and between each of the rolling wheels and the driving wheel. It has been described as comprising a wound rubber crawler.

However, the crawler belt device of the present invention is not limited to the embodiment, and for example, as shown in a second modified example shown in FIG. A bracket 82, a drive wheel 83 provided on the front side of the swing bracket 82, one rolling wheel 84 also provided on the rear side of the swing bracket 82, and the drive wheel 83 and the rolling wheel 8;
4 and a rubber crawler 85 wound between them.

In this modification, a backhoe type excavator is used as a tracked vehicle. The excavator is provided with a lower traveling body 86 and an upper revolving body 87 which is provided on the lower traveling body 86 so as to be capable of turning. And a working device 88 provided at a front portion of the upper swing body 87.

Further, in each of the embodiments, a hydraulic excavator has been described as an example of a tracked vehicle. However, the present invention is not limited to this. For example, the crawler device is applied to a luggage carrier such as a truck. Is also good.

[0085]

As described above in detail, according to the first aspect of the present invention, the crawler device is provided so as to be swingable with respect to the drive shaft on the vehicle body side, and the crawler device is provided between the rolling wheel and the drive wheel. Since the slip prevention member made of a metal member is detachably provided on the surface side of the rubber crawler wound therebetween, when traveling on an uneven road surface, the crawler device adjusts the drive shaft according to the inclination of the road surface. Because it can be rocked to the center, the rubber crawler can always be widely grounded to the road surface,
Drivability can be improved.

In addition, when traveling on a frozen road surface, the slip prevention member can be made to bite into the frozen road surface, so that the rubber crawler can be prevented from slipping by the gripping force of the slip prevention member at this time, and stable. Drivability can be obtained.

According to the second aspect of the present invention, since the slip prevention member is detachably attached to the rubber track, the vehicle travels on a pavement road with the slip prevention member removed from the rubber track. , The rubber track can be directly grounded to the road surface. As a result, it is possible to reduce the damage and the like generated on the road surface, reduce the impact and the like received from the road surface, and improve the traveling performance on such a road surface.

According to the third aspect of the present invention, since a plurality of lugs are provided on the surface of the rubber crawler and a slip prevention member is attached to a tip side of the lugs, the vehicle travels on a relatively soft road surface such as muddy ground. In some cases, a plurality of lugs provided on the rubber track can be deeply cut into the road surface, and the traveling performance can be further enhanced by the grip force of the lugs at this time. Also, when traveling on a frozen road surface, the anti-slip member can be strongly pressed against the road surface by the lugs, so that the anti-slip member can be easily bite into the road surface, the grip force on the road surface can be further increased, and more stable. It is possible to obtain excellent running performance.

According to the fourth aspect of the present invention, since the fastening portion provided on the slip preventing member is inserted into the through-hole of the rubber crawler and fastened at a position on the back side of the rubber crawler, the fastening is performed during traveling. The side can be protected from impacts such as earth and sand, and the fastening portion allows the anti-slip member to be stably attached to the rubber crawler, thereby improving the reliability of the device.

Further, according to the fifth aspect of the present invention, since the anti-slip member is formed by using a metal bar, the anti-slip member can be easily processed, and workability at the time of processing can be improved.

Further, even when the anti-slip member is formed using a metal plate as in the sixth aspect of the present invention,
Even when the slip prevention member is formed by using rivets as in the invention of the seventh aspect, workability at the time of processing the slip prevention member can be improved in the same manner as the invention of the fourth aspect.

On the other hand, according to the invention of claim 8, since the uneven pattern is formed in the portion of the slip prevention member that comes into contact with the road surface, the grip force obtained when the slip prevention member bites into the frozen road surface is obtained. Can be increased by the concavo-convex pattern, and the traveling performance can be further improved.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view of the crawler belt device on the front left side in FIG.

FIG. 3 is an enlarged cross-sectional view of a front axle device, a crawler device, and the like, as viewed in a direction indicated by arrows III-III in FIG.

FIG. 4 is an enlarged partial cross-sectional view of a crawler belt device on the front right side in FIG. 3;

FIG. 5 is an enlarged sectional view showing a rubber track in FIG. 4;

6 is a cross-sectional view as seen from the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a cross-sectional view as seen from the direction of arrows VII-VII in FIG. 5;

FIG. 8 is a cross-sectional view showing a rubber track, a slip prevention bar, and the like of a crawler belt device according to a second embodiment of the present invention.

9 is a cross-sectional view as seen from the direction of arrows IX-IX in FIG.

FIG. 10 is a sectional view showing a rubber track, a slip prevention bar, and the like of a crawler belt device according to a third embodiment of the present invention.

11 is a cross-sectional view as viewed from the direction indicated by arrows XI-XI in FIG.

12 is a cross-sectional view as seen from the direction of arrows XII-XII in FIG.

FIG. 13 is a sectional view showing a rubber track, a slip prevention bar, and the like of a crawler belt device according to a fourth embodiment of the present invention.

FIG. 14 is a cross-sectional view as viewed from the direction indicated by arrows XIV-XIV in FIG. 13;

FIG. 15 is a cross-sectional view showing a rubber track, a slip prevention bar, and the like of the crawler belt device according to the first modification of the present invention.

FIG. 16 is an external view showing a hydraulic excavator according to a second modification of the present invention.

FIG. 17 is a partial cross-sectional view showing a state in which a rubber track according to the related art is grounded on soft muddy ground.

18 is a partial cross-sectional view showing a state where the rubber track in FIG. 17 is grounded on a frozen road surface.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle body 10 axle housing 12 drive shaft (drive shaft) 17, 36, 41, 51, 61, 81 crawler device 19, 37, 82 swing bracket 21, 38, 84 wheel 22, 39, 83 drive wheel 29, 40 , 52, 62, 85 Rubber crawlers 30A, 53A, 63A Lugs 30B, 53C, 63C Tip surfaces 30D, 53B, 63B Through holes 34, 42 Anti-slip bars 43, 44, 72, 73 Depressed grooves 54, 71 Anti-slip plate 64 Anti-slip rivet 64A head

Claims (8)

[Claims] An axle housing provided in the vehicle body at a distance from the front and rear of the vehicle body; a front and rear drive shaft rotatably inserted into the axle housing; And a crawler device before and after being driven by the drive shaft. The crawler device is provided so as to be relatively rotatable around the drive shaft, and around the drive shaft. A swinging bracket that swings, a rolling wheel rotatably provided on the swinging bracket,
A driving wheel provided around the tip of the driving shaft, a rubber crawler wound between the rolling wheel and the driving wheel, and a rubber crawler on a ground contact side of the rubber crawler to prevent the rubber crawler from slipping. A tracked vehicle comprising a slip prevention member made of a metal member provided at a position. 2. The apparatus according to claim 1, wherein the slip prevention member is detachably attached to the rubber track.
A tracked vehicle according to claim 1. 3. A surface of the rubber track is formed with a plurality of lugs spaced apart in a longitudinal direction of the rubber track and having a tip projecting in a thickness direction of the rubber track. The tracked vehicle according to claim 1 or 2, wherein the vehicle is configured to be attached to a tip of a lug. 4. The rubber crawler is provided with a through-hole penetrating from the front side to the back side of the rubber crawler, and the slip prevention member is inserted into the through-hole and provided on the back side of the rubber crawler. The tracked vehicle according to claim 1, 2, or 3, further comprising a fastening portion to be fastened. 5. The tracked vehicle according to claim 1, wherein the slip prevention member is a metal rod extending along a width direction of the crawler belt. 6. The tracked vehicle according to claim 1, wherein the slip prevention member is a metal plate extending along a width direction of the rubber crawler. 7. The rivet having a head portion having a diameter larger than a diameter of the through hole, wherein the slip prevention member is provided.
5. The tracked vehicle according to claim 4, wherein the rivet is inserted through the through-hole with the head engaged with a surface side of a rubber crawler. 6. 8. An uneven pattern is formed at a portion of the slip prevention member that comes into contact with a road surface.
The tracked vehicle according to 2, 3, 4, 5, 6, or 7.