JP2871630B2 - Core metal for elastic crawler and elastic crawler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless band-shaped core metal and an elastic crawler made of an elastic material such as rubber.

[0002]

2. Description of the Related Art As a core metal for an elastic crawler and an elastic crawler, a core metal having a pair of left and right guide projections is embedded at predetermined intervals in a longitudinal direction of a belt in an endless belt-shaped crawler body made of an elastic material. By forming an engagement hole for the drive wheel between the cores, a tensile member such as a steel cord is embedded, and lugs are provided on the outer peripheral surface of the crawler body corresponding to the wings of each core. Are known.

[0003] A pair of guide projections are provided on the left and right corresponding to the central portion of the main body and are separated in the longitudinal direction of the band. An opening is formed between the pair of guide projections, and the core is embedded in the main body. An elastic projection integral with the main body is formed in the opening between the guide projections (see FIGS. 9 and 10 disclosed in Japanese Patent Laid-Open No. 4-2583). In this prior art, when a load such as a rolling wheel is applied to the top end of the core bar guide projection,
The vertical deflection is greater than the center of the top surface, and when the body sinks, the elastic projections between the guide projections have the advantage that the rolling wheel vertical vibration can be suppressed.

[0004]

However, in the above-mentioned prior art, the engaging holes of the drive wheels (splats) are formed between the metal cores buried in the band-shaped main body. There has been a problem that the pitch of the engagement holes is too long, so that there is little chance of engaging and disengaging the driving claw, and it is difficult to perform smooth running.

On the other hand, if the pitch of the engaging holes is to be reduced, it is necessary to bury the core metal by narrowing the interval between the core metals, which causes a problem of increasing the weight.
Therefore, the present invention improves the shape of the metal core,
An object of the present invention is to provide a core metal for an elastic crawler and an elastic crawler capable of performing reliable rotation by increasing engagement opportunities of claws of a driving sprocket.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a core bar embedded in an endless band-shaped main body made of an elastic material with a gap in a band longitudinal direction, and a pair of guides provided at the left and right of a central portion thereof. The following technical measures are taken to achieve the above-mentioned object in the elastic crawler core metal having the projections.

That is, in the core of the present invention according to the first aspect, a pair of locking portions separated in the longitudinal direction of the band connecting the left and right lower portions of the pair of guide projections are provided at the center of the core.
A pair of locking portions for disengaging the driving claw from the pair of locking portions;
The engaging hole of the driving claw is formed through the core metal in the thickness direction.
At the same time, the pair of guide projections are
It is characterized by forming a ridge . Also,
The core metal of the present invention according to claim 2 is the core metal for an elastic crawler according to claim 1, further comprising a wing portion extending left and right of the pair of guide protrusions in the width direction of the main body. Each of the left and right wings is characterized in that ribs extending in the extending direction through openings formed long in the extending direction are formed so as to protrude around the opening.

Further, according to the present invention, a core bar having a pair of guide projections formed on the left and right sides of a central portion is buried in an endless band-shaped main body made of an elastic material with a gap in a band longitudinal direction. In order to achieve the above-mentioned object, the following technical measures are taken in the elastic crawler in which the engagement hole of the driving claw is formed penetrating between the metal cores. That is, the elastic crawler of the present invention according to claim 3, metal core a pair of locking portions spaced bands longitudinally connecting the left and right lower portion of the pair of guide projections each other
Provided in the center, for engaging and disengaging the drive claw with the pair of locking portions
An engaging claw different from the engaging hole is provided between the pair of locking portions.
It is formed so as to penetrate in the thickness direction of the gold, and
The pair of guide projections are formed to protrude from a stop portion . According to a fourth aspect of the present invention, in addition to the third aspect, the core metal includes wing portions extending in the width direction of the main body on the left and right sides of the pair of guide protrusions. Each has a rib extending in the extending direction through an opening formed long in the extending direction is formed to protrude around the opening, and the left and right wings are embedded in the main body. Is what you do.

According to the present invention, by embedding the core with a gap in the band longitudinal direction of the band-shaped main body, an engaging hole of the driving claw is formed between the cores adjacent in the band longitudinal direction. An engagement hole between a pair of locking portions for connecting the left and right of the pair of guide projections on the cored bar to each other is also formed. Therefore,
The pitch of the engagement holes is a small pitch because the locking holes formed in the core metal are located between the engagement holes formed between the metal cores,
The number of opportunities for engaging and disengaging the driving claw increases, so that the belt-shaped main body runs smoothly in the longitudinal direction of the belt. Also, by forming ribs on the left and right wings of the metal core, the adhesive force when embedded in the main body increases, and even if the driving claw repeatedly engages and disengages with the locking part of the metal core, the core metal is reliably separated. Is prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the illustrated embodiment. In FIGS. 1 to 4, reference numeral 10 denotes an endless crawler body, which is mainly composed of elastic rubber.
The crawler main body 10 has a core metal 11 embedded at a predetermined interval in the circumferential direction and a tensile body 12 such as a steel cord embedded therein. A ground lug 14 having two protrusions 13 is provided on the ground surface side of the crawler body 10.
The left and right two rows are provided in the width direction of the crawler body 10 so as to substantially coincide with the projection area of the metal core 11.

The metal core 11 has a metal core base 15 embedded in the crawler main body 10 and a pair of left and right guide projections 16 exposed on the inner peripheral side of the crawler main body 10. Core base 15
As shown in FIGS. 6 to 9, is a rectangular frame shape in plan view that is long in the left-right width direction of the crawler main body 10, and has a pair of horizontal rod portions 17 and a connecting portion that connects both sides of the horizontal rod portion 17. 18. The pair of guide projections 16 are formed in a pair on the cored bar base 15 so as to connect the pair of horizontal rods 17 so that a predetermined interval is formed between the two. Guide projection 16 and a pair of horizontal rods 1
7, an engagement hole 19 is formed. As shown in FIG. 5, the lateral rod portions 17 on both sides of the engagement hole 19 are abutting portions 22 that abut against the valley portions 21 of the driving sprocket 2, and the teeth 23 of the driving sprocket 20 are engaged. Hole 19
, The contact portions 22 contact the valley portions 21 on both sides of the tooth portion 23, respectively. The lateral rod portion 17 outside the pair of guide protrusions 16 constitutes a longitudinal rib on the cored bar base 15, and is located on the rolling surface 25 side of the track roller 24 from the base of the guide protrusion 16. A convex portion 26 is formed toward the horizontal rod portion 17 in the direction.
The guide projection 16 has a trapezoidal shape, and a cutout portion 28 is formed continuously with the engagement hole 19 so that the skirt portion 27 remains outside to reduce the weight.

The length of the guide projection 16 is set within the projection area of the metal core base 15. An engagement hole 29 is formed between the core metals 11 adjacent to the crawler body 16. That is, the mandrel 11 has a pair of guide projections 16 on the left and right sides of its center.
The pair of guide projections 16 are provided with a pair of locking portions (contact portions) 22 which are separated in the longitudinal direction of the band and connect the left and right lower portions of the pair of guide projections 16 to each other at the center of the core bar. Stop 2
2 to disengage the driving claw between the pair of locking portions 22;
An engagement hole 19 different from the engagement hole 29 penetrates in the core metal thickness direction.
And a pair of locking portions 22
The pair of guide projections 16 are formed to protrude , and each of the left and right wings extending outward in the left-right direction is provided with a hole (opening) 30 formed long in the extending direction. )
Ribs (horizontal rod portions) 17 extending in the extending direction through the projections 30 are formed to protrude before and after the opening 30.

Since the driving claw is engaged with and disengaged from the locking portion 22, the cross section has a substantially spherical shape as shown in FIG. By improving the torsional rigidity of the wing by the cooperation of the hole and the rib 17 while reducing the weight while increasing the adhesive strength when embedded in the main body 1 to achieve the prevention of peeling. is there.

In the above embodiment, the operation in the case where the elastic crawler is wound around a driving sprocket (drive claw), a rolling wheel, and an idler attached to the body of the traveling device and travels on a pavement road surface will be described. The engagement hole 29 formed between the cored bar 11 and the engagement hole 1 formed between the locking portion 22 of the cored bar 11 at the winding portion by the rotation of the drive claw.
The crawler body 1 is rotated by the hooks 9 being disengaged and engaged with the locking portions 22, respectively, and is driven by the traction force of the lugs 5.

At this time, in the embodiment of the present invention, not only the engagement hole (first engagement hole) 29 formed between the cored bars 11 but also
An engagement hole (second engagement hole) 19 formed in the core metal 11 itself is located between the first engagement holes 29, and the first and second engagement holes 2 are provided.
By alternately arranging the strips 9 and 19 in the longitudinal direction of the band, the engagement and disengagement pitch of the driving claw is reduced, thereby assuring reliable engagement. That is, unlike the conventional example, the pitch of the engagement holes is too long due to only the first engagement holes, whereas the second engagement holes 19 are formed in the cored bar 11 itself. The pitch interval is shortened, and the opportunity for the action of the driving claw is increased, so that reliable running is assured.

When the driving claw engages with the locking portion 22 of the cored bar 11, the impact force propagates to the wings of the cored bar 11 to cause the cored bar 11 to peel off. Hole 30 in wing
Is formed, and the torsional rigidity is improved in cooperation with the ribs 17 and the adhesive force is enhanced, so that the peeling of the core metal 11 is reliably prevented. That is, the teeth 23 of the drive sprocket 20 are sequentially engaged with the engagement holes 19 and 29, and rotate the crawler main body 10 in the direction indicated by the arrow B in FIG. In this case, the teeth 23 of the drive sprocket 20
When the core metal 11 is engaged with the engagement hole 19, the abutting portions 22 on both sides thereof abut against the valleys 21 on both sides of the tooth portion 23, so that the core metal 11 itself does not move erratically. , Core 1
1 and the wear of the drive sprocket 20 are reduced,
Problems such as damage to the tensile member 12 and peeling of the rubber bonded portion due to the movement of the cored bar 11 can also be solved.

The core 11 is made of a casting or the like.
0, the presence of the cutouts 28 can reduce the overall weight and increase the adhesion area between the rubber of the crawler body 10 and the core metal 11 to improve the adhesiveness. The skirt portion 27 of the guide projection 16 may be omitted as shown in FIG.

There is also a type in which the track roller 24 rolls on the top surface of the guide projection 16. In this case, the eleventh
As shown in FIG. 13 to FIG. 13, the crawler body 10 is located only on one end side of the guide projection 16 beyond the projected area of the cored bar base 15.
A protruding portion 31 protruding along the circumferential direction is formed. Since the guide projections 16 are provided in two rows, the projections 31
Are arranged in a zigzag pattern so that they are alternately left and right.

In this manner, the width L _{1 of the} cored bar base 15 is obtained.
When the track roller 24 rolls between the guide protrusions 16 of the adjacent metal cores 11 because the track roller 24 and the length L ₂ of the guide protrusion 16 do not greatly differ from each other, as shown in FIG. Even when the track roller 24 rides on the point C, the track roller 24 is supported at the point D of the guide projection 16, so that it is possible to prevent the track roller 24 from sinking below the point C side. Therefore, the unstable inclination of the metal core 11 is eliminated.

[0020]

As described above in detail, according to the present invention, the pitch of the engaging holes with which the driving claws engage and disengage can be made fine without reducing the burying interval in the longitudinal direction of the core bar, thereby increasing the weight. The number of opportunities for engaging and disengaging the drive claw can be increased without incurring the problem, and reliable traveling (running) can be ensured. In addition, ribs extending in the width direction can be formed on the left and right wing portions of the core bar to improve torsional rigidity, and the adhesion to the belt-shaped main body is also increased, so that peeling of the core bar can be reliably prevented and durability is improved. .

[Brief description of the drawings]

FIG. 1 is a bottom view of a crawler.

FIG. 2 is a plan view of a crawler.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2;

FIG. 5 is a sectional view of a crawler driving unit.

FIG. 6 is a plan view of a cored bar.

7 is a view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is a side view of a cored bar.

FIG. 9 is a view taken in the direction of arrows IX-IX in FIG. 7;

FIG. 10 is a sectional view showing a second example.

FIG. 11 is a plan view showing a third example.

FIG. 12 is a sectional front view of the same.

FIG. 13 is a sectional side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Crawler main body 11 Core metal 16 Guide protrusion 19 Engagement hole 22 Engagement part 29 Engagement hole

Claims (4)

(57) [Claims] 1. A metal core which is embedded in an endless belt-shaped main body made of an elastic material with a space in a longitudinal direction of the belt, and has a pair of guide projections formed on the left and right of a central portion thereof. In the core for the elastic crawler, a pair of locking portions separated in the longitudinal direction of the band connecting the left and right lower portions of the pair of guide protrusions to each other are provided at the center of the core,
Between the pair of locking portions to disengage the driving claw from the locking portion.
If the engaging hole of the driving claw is formed to penetrate in the thickness direction of the core,
In addition, the pair of guide projections protrude from the pair of locking portions.
A core metal for an elastic crawler, which is formed . 2. A core metal for an elastic crawler having a pair of guide projections and left and right wings extending in the width direction of the main body, wherein each of the left and right wings is formed to be long in the extending direction. Rib extending in the stretching direction through the opening
The core metal for an elastic crawler according to claim 1, wherein the metal core is formed to protrude around the mouth . 3. A core metal having a pair of guide projections formed on the left and right sides of a central portion thereof is embedded in an endless belt-shaped main body made of an elastic material with a gap in a band longitudinal direction. In an elastic crawler having an engagement hole of a driving claw penetrated between gold, a pair of locking portions separated in a belt longitudinal direction connecting left and right lower portions of the pair of guide protrusions are provided in a central portion of the core metal, The pair
Between the pair of locking portions to disengage the driving claw with the locking portion.
In addition, an engaging hole different from the above-mentioned engaging hole is penetrated in the core metal thickness direction.
And a pair of locking portions from the pair of locking portions.
An elastic crawler , wherein a guide projection is formed as a ridge . 4. The core bar has wings extending in the width direction of the main body on the left and right sides of the pair of guide projections, and each of the left and right wings has an opening formed in the extending direction. The elastic crawler according to claim 3, wherein ribs extending in the extending direction are formed to protrude around the opening , and the left and right wings are embedded in the main body.