JP2609801B2 - 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 elastic crawler used for tracked vehicles such as construction, civil engineering, and agriculture.

[0002]

2. Description of the Related Art For example, a changeable elastic crawler which is useful for changing and replacing a crawler made of iron is provided on a crawler body formed of an elastic material at equal intervals in a crawler circumferential direction (hereinafter abbreviated as a circumferential direction). A core bar is embedded, an engagement hole for driving sprocket engagement is formed between each core bar, and a pair of left and right (crawler width direction) protrusions are formed on each core bar so as to protrude on the inner peripheral side. A lug is integrally formed at a position corresponding to the cored bar, and a top surface of the projection serves as a wheel passing surface through which driving wheels, rolling wheels, and the like pass.

In a large civil engineering machine, as shown in FIG. 9, the pitch of the mandrel 4 is reduced so that the lug 7 substantially covers the projection surface of the wing 4A of the two mandrels 4. In addition, the left and right lugs 4 are shifted in a half pitch circumferential direction and staggered,
There is one in which durability is improved (Japanese Patent Laid-Open No. 1-2
0828 4 JP).

[0004]

In the prior art, since the lug 7 has a circumferential length that covers the two cores 4, all the cores 4 are placed on the left and right lugs 7, and the distance between the cores 4 is increased. Since the left and right sides are always placed on the lug 7, the rigidity is high both on and between the metal cores 4 and the amplitude of the vibration of the elastic crawler is slightly reduced, but the deflection is the smallest on the center of the metal core 4, The vibration increases at the end of the metal core 4 and becomes largest at the end of the metal core 4 where the rolling wheel contacts, and greatly changes from the minimum to the maximum, so that the vehicle body vibration is easily felt.

[0005] Further, the bending resistance is dramatically increased, and it is difficult to smoothly wind the vehicle around driving wheels and the like, resulting in loss of horsepower and poor fuel economy, resulting in a decrease in running performance.
Further, the elongation of the lug at the time of bending of the crawler is increased, the lug is easily cut, and substantial improvement in durability is hardly expected. Therefore, as shown in FIG. 8, within the range of the lug length in the crawler width direction, the grounding surfaces of the lugs 7 on the left and right sides are overlapped in a small range of the cored bar 4.
That is, it is conceivable to reduce the amount of overlap of the lug 7 with respect to the mandrel 4 and slightly increase the amount of bending at the center of the mandrel 4 to reduce the amount of change in bending.

By this, the amplitude of the body vibration is reduced and the bodily sensation is improved. However, if the right and left lugs 7 are regularly shifted by half a pitch, the vibration becomes the same at the pitch of the cored bar 4 and the bodily sensation is felt. Vibration is likely to occur, resulting in poor ride comfort. A first object of the present invention is to provide an elastic crawler in which the center of a lug on one side is shifted back and forth from the center between the lugs on the other side, so that vibration is hardly perceived. is there.

[0007] A second object of the present invention is to provide one core metal and the same.
Straddle one lug against the metal core adjacent to
Different amount of lug deflection at each part between gold and core
By that, it is to provide an elastic crawler which is adapted suppress the amplitude of the vibration increases.

[0008]

The first concrete means for solving the problem in the present invention is the width of the crawler body (2).
Drive wheel engagement with a crawler longitudinal direction spacing at the center
Between the engaging holes (4) at the front and rear in the circumferential direction.
Left and right protrusions (15) and (16) and the protrusions (15)
A core metal having left and right wings (4A) extending from (16)
(4) is embedded in the crawler body (2), and the left and right wings are
Distribute the tensile member (5) in the circumferential direction on the outer peripheral side of (4A)
And the outer surface of the crawler body (2)
Projection of two core metal wings (4A) adjacent to (6) before and after
A lug (7) having a circumferential length (W) covering the surface is clawed.
Laminated right and left from the center of the la main body (2) in the width direction to form a build-up
The center of each left and right lug (7) is formed and the front and rear core metal (4)
From the center of the lug (7)
Change the circumferential overlap length with gold (4)
The left and right protrusions (15) and (16) are
(2) formed in a protruding manner on the inner peripheral surface and opposite to each other in the circumferential direction.
An elastic crawler, which is shifted and point-symmetrically formed .

A second concrete means for solving the problems in the present invention is that the left and right projections (15) and (16)
One set of front and rear guide projections (F) (R)
Between the front and rear guide projections (F) and (R).
Guide projection of one of the projections
The cleavage (U) is the front and rear guide projection (F) of the other projection.
(R) and almost the entire width overlap in side view
And the claw in the guide projection valley (U)
The same material as the rubber body (2) or an elastic material of higher hardness
The elastic projection (18) is made of one piece with the crawler body (2).
An elastic crawler characterized by being formed into a body .

[0010]

In FIG. 7, when the rolling wheel passes through the inner circumferential surface of the elastic crawler 1, the center of the core 4 where the left and right lugs 7 are largely overlapped has the least bending (A1). When escaping from the end of the metal core 4, the metal core 4 is inclined, so that a slight bending occurs (B1), and when reaching the middle of the next metal core 4, the bending decreases (A2), and the right and left lugs 7 slightly overlap. When the end of the cored bar 4 is tilted while colliding with the end of the cored bar 4, the rigidity is low at this portion and the maximum amount of bending occurs (B
2).

If the rolling wheel is mounted on the center of the metal core 4 where the right and left lugs 7 are slightly overlapped, the bending is reduced (A3).
Since the core 4 is inclined when it escapes from the end of the core 4, a slight bending occurs (B 3), and when reaching the middle of the next metal 4, the bending decreases (A 4), and the left and right lugs 7 increase. When it collides with the end of the cored bar 4 which has been polymerized, it is slightly tilted due to its high rigidity, and a small bending occurs (B
4).

Therefore, bending occurs at the front and rear positions (B1 and B2) of the position (A1) where the bending is the least, but the amount of bending is small, and the front and rear positions (A2 and B2) of the position (B2) where the bending is the most.
In A3), the deflection is reduced, but the amount of the reduction is small, so that a large swell is formed in the vibration. Even if the overall amplitude is substantially the same, there is no sudden deflection, so that the riding comfort is good.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 7, reference numeral 1 denotes an elastic crawler, which is wound around wheels 14 such as a driving wheel, a driven wheel, and a plurality of rolling wheels made of a sprocket. This elastic crawler 1 is made of rubber,
Crawler body 2 made of elastic material such as synthetic resin
A metal core 4 made of metal or synthetic resin is buried at equal intervals in the crawler circumferential direction A, and steel is provided on the outer periphery (ground surface) side of the metal core 4 corresponding to the left and right wing portions 4A of the metal core 4. A pair of left and right circumferential tension members 5 formed by embedding are embedded in the crawler body 2, and an engaging hole 3 is formed in the crawler body 2 at or near the center in the left and right direction and between the metal cores 4 to engage the drive wheels. And
On the outer peripheral surface 6 of the crawler body 2, a lug 7 having a circumferential length W extending over the two metal cores 4 is integrally formed.

Each of the metal cores 4 has a pair of left and right projections 15,
16 are integrally formed and project from the inner peripheral surface 8 of the crawler main body 2. The top surfaces of the projections 15 and 16 serve as flat wheel passing surfaces 17 on which wheels 14 such as rolling wheels roll. ing. In each cored bar 4, the left and right wing portions 4 </ b> A are located at the same position in the circumferential direction A, whereas the left and right protrusions 15 and 16 are
Are formed in the opposite directions and point-symmetrically.

The left and right projections 15 and 16 are arranged in the circumferential direction A.
And a pair of front and rear guide projections F and R, and a valley U between the front and rear guide projections F and R,
The valley U between the guide protrusions of one of the protrusions substantially overlaps one of the front and rear guide protrusions F and R of the other protrusion in substantially side view. Reference numeral 18 denotes an elastic projection formed in a valley U between the guide projections of each of the projections 15 and 16 of the cored bar 4. The elastic projection 18 is made of the same material as the crawler body 3 or an elastic material having a higher hardness. It is integrally formed with the main body 2, and its top part is slightly projected from the wheel passage surface 17.

As shown in FIGS. 1 and 3, the lug 7 is
, And are arranged in a zigzag pattern in the circumferential direction A. Each lug 7 has a circumferential length W1 on the inner side and a circumferential length W2 shorter on the outer side, and has a block shape tapered to the left and right outer sides. No. 4 wing 4A, and its base has a shape that covers the projection surface of the two wings 4A by 40 to 80%.

The center of the left and right lugs 7 in the circumferential direction A is
Are displaced forward by a dimension S from the center of the engaging hole 3, the left lug 7 is displaced rearward by a dimension S from the center of the engaging hole 3, and the left and right lugs 7 are displaced by the same dimension in the front and rear opposite directions. The lug pitch of the lug 7 in the circumferential direction A is such that P1 and P2 are alternately arranged. The ratio of the lag pitches P1, P2 is P1 / P2 = 1.1 to 2.0, and 1.2 to 1..
The range of 4 is preferable. Compared with the case of equal pitch, the amplitude of the vibration is not much different, but the cycle is longer, and the riding comfort is improved.

Therefore, the superposition of the mandrel 4 and the lug 7 is limited within the range of the length of the lug 7 in the crawler width direction.
The grounding surfaces of the lugs 7 on the left and right sides are polymerized in the range of 50 to 80% in the larger one of the cores 4 and 10 to 40% in the smaller one
, And a difference occurs in the amount of polymerization. On the outer peripheral surface 6 of the crawler body 2 between the lugs 7, a built-up portion 20 for improving lug strength is formed on the base side of the lug 7,
On the outer side, a side reinforcing portion 21 further raised than the build-up portion 20 is formed, and this side reinforcing portion 21 connects the base of the front and rear lugs 7 and overlaps with the wing portion 4A.
The outer end of the wing portion 4A prevents the side portion of the crawler body 2 from being damaged or unevenly worn.

An elastic projection 23 is formed integrally with the lug 7 on the outer peripheral surface 6 side of the core 4 between the engagement holes 3, and the elastic projection 23 reinforces the core 4. In both the front view shown in FIG. 3 and the side view shown in FIG. 5, it is formed in an inverted trapezoidal shape, and has a shape which is not damaged by driving wheels or the like. The elastic projection 23 is not thicker than the lug 7 but is thicker than the conventional lug, and is built up on the core 4 so that the core 4 is exposed due to friction or an injury, and a rubber chip is generated from the exposed portion. 5, so that the durability of the elastic crawler 1 is improved.

On the inner peripheral surface 8 side of the crawler main body 2, a groove 9 is formed between each of the metal cores 4 and extends from the engagement hole 3 side to the left and right outer sides. The groove 9 is originally for removing the elastic crawler 1 in advance so that the elastic body is not pinched and crushed by the front and rear projections 15 and 16 when the elastic crawler 1 is bent. The groove 9 has a long groove 9A and a short groove 9B,
The short groove 9B is for preventing the protrusions 15 and 16 from being crushed, and is formed at a position that does not correspond to the lug 7 on the outer peripheral surface 6 side. On the other hand, the groove 9A is formed at a position corresponding to the lug 7, thereby facilitating the bending of the crawler body 2 in addition to preventing the protrusions 15 and 16 from being crushed.

The lug-corresponding groove 9A has substantially the same depth as the groove 9B, has a groove bottom substantially parallel to the tension member 5, and the distance from the tension member 5 to the groove bottom is equal to the distance from the tension member 5 to the outer periphery. The length L is substantially the same as or slightly longer than the distance to the surface 6, and the length L
To an intermediate position between the end of the groove 9B and the outer end of the wing portion 4A, and the outer end thereof smoothly continues from the groove bottom to the inner peripheral surface 8.

The elastic crawler 1 is a claw made of an elastic material.
Engagement holes 3 for driving wheel engagement are formed in the main body 2 at equal circumferential intervals.
Between the engaging holes 3 at the front and rear in the circumferential direction in the crawler body 2.
The gold 4 is embedded and the outer peripheral side of the left and right wings 4A of the core 4
The tensile member 5 in the circumferential direction is embedded in the crawler body 2
6, a lug 7 having a circumferential length W extending over the two metal cores 4
Of the right and left lugs 7
From the center between the front and rear mandrel 4 in the front and rear reverse direction,
If the overlap length in the circumferential direction between
I'm making it. That is, one of the right and left lugs 7 is connected to one cored bar 4.
On the front and rear sides and the adjacent core 4
7 is straddled over one core 4 and its adjacent front and back.
The grounding surfaces of the right and left lugs 7 are roughly
From the center, cross the end of the concentric bar 4 on the adjacent core bar side and between the core bars 4.
To the end of the adjacent mandrel 4 on the side of the one mandrel.
I'm up. This means that the center of one cored bar 4
The end of the metal core 4 on the adjacent metal core side, between the metal cores 4, in front of the metal core 4 adjacent to the metal core 4
All of the parts such as the end on the side of the cored bar are the right and left lugs 7.
The distance from the center of the lug is different, and the deflection of the lug 7 is different
And the amount of deflection of the lug 7 is changed from small to large or large.
In order to reduce the front-back difference
You. Note that the present invention is not limited to the above-described embodiment, and can be variously modified. For example, the center of the left and right one side lugs 7 may be aligned with the center of the engagement hole 3, and the center of the left and right other side lugs 7 may be shifted from the center of the engagement hole 3 (the center between the one side lugs 7), The pattern of the lug 7 may be, for example, a shape inclined with respect to the crawler width direction, a shape in which left and right are continuous, and the like.

Next, the state of occurrence of vibration in the present invention will be described in comparison with the prior art and the comparative art. The elastic crawler of the comparative technique shown in FIG. 8 has the same lug 7 on the right and left sides as the center between the lugs 7 on the other right and left sides, as in the prior art shown in FIG. Is set so that the amount of overlap with the cored bar 4 is smaller than that of the prior art.

7 to 9, it is assumed that when the wheel 14 rolls as indicated by the dotted arrow, the cored bar 4 relatively moves as indicated by the solid arrow. When the wheel 14 rolls, the deflection is the least at the center of the core 4 where the right and left lugs 7 are largely overlapped (position A1).
, And less than the deflection at the position C1 of the comparative technique.

When the wheel 14 escapes from the end of the mandrel 4, the mandrel 4 is inclined, so that a slight bending occurs (position B).
1) When reaching the middle of the next cored bar 4, the bending decreases (position A2), and when the left and right lugs 7 are tilted while colliding with the ends of the slightly overlapped cored bar 4, Since the rigidity is low in the portion, the maximum amount of bending occurs (position B2). The positions F1 and E2 of the prior art corresponding to these and the positions D1, D2 and C2 of the comparative technology cause almost the same bending, but the prior art has higher rigidity at the position of the core 4 than the others, so The amount of deflection is smaller than T2.

In this range, the conventional technique and the comparative technique repeat the above-described vibration, and the positions F2 to E1 and the positions D
The maximum drop is generated from 2 to C1, the amplitude is substantially the same even though the amount of bending is small, and the maximum and minimum bending positions are repeated in a fine cycle. On the other hand, in this case in the same range, since the position of B1 is located near the center of the lug 7, the amount of deflection is smaller than that of the comparative technique and is substantially equal to that of the conventional technique. Further, since there is the core 4 in which the right and left lugs 7 are slightly overlapped, the wheel 1 is located at the center of the core 4.
At the A3 position on 4, the deflection is reduced to about the same level as the A2 position but larger than the large overlapped core 4, and the core 4 is inclined when it escapes from the end of the core 4 (position B3). Therefore, a slight bending occurs, and when reaching the middle of the next core bar 4, the bending decreases (position A 4), and when the right and left lugs 7 collide with the end portion of the core bar 4 which is largely overlapped, the rigidity is high. A slight incline, resulting in less deflection (position B
4). Over the positions A3 to A1 and over the positions B3 and B4, the amount of these bending decreases stepwise.

That is, the minimum bending position is the maximum lug overlap metal core 4.
At the center, the maximum bending position is at the end of the lug minimum overlap metal bar 4, and these occur at every third core metal 4, causing large undulations other than vibration, and the overall amplitude including undulations is approximately Even if it is the same, the amplitude during the swell is halved, and since there is no sharp swing, the ride comfort perceived is better than the conventional technology and the comparative technology.

[0028]

According to the present invention described in detail above, during traveling
Form a large swell in the generated vibration, the overall amplitude is
Improves ride comfort by preventing sudden run-out even if they are almost the same
can do.

In addition, the effect of lugs at all parts
In contrast, the difference between before and after the vibration is reduced, and the bodily sensation vibration can be halved
You. Furthermore, the difference in rigidity between the metal cores can be reduced, and the vibration amplitude can be reduced.
The increase can be suppressed.

[Brief description of the drawings]

FIG. 1 is an outer peripheral view showing an embodiment of the present invention.

FIG. 2 is an inner peripheral view of the same.

FIG. 3 is a sectional view corresponding to a section taken along line XX of FIG. 2;

FIG. 4 is a side view of the same.

FIG. 5 is a sectional view taken along line YY of FIG. 2;

FIG. 6 is a sectional view taken along the line ZZ of FIG. 2;

FIG. 7 is an explanatory diagram of vibration generation according to the present invention.

FIG. 8 is an explanatory diagram of vibration generation according to a comparative technique.

FIG. 9 is an explanatory diagram of vibration generation according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic crawler 2 Crawler main body 3 Engagement hole 4 Core metal 6 Outer peripheral surface 7 Lug 8 Inner peripheral surface

Claims (2)

(57) [Claims] The crawler body (2) is provided with a
Engagement holes for driving wheel engagement at intervals in the roller longitudinal direction
(4) is provided, and left and right protrusions are provided between the engagement holes (4) in the front and rear directions in the circumferential direction.
From the parts (15) and (16) and the projections (15) and (16)
The core metal (4) having the left and right wings (4A) extending
Embedded in the main body (2), and the outer periphery of the left and right wings (4A)
When the tensile member (5) in the circumferential direction is embedded on the side
Both are adjacent to the outer peripheral surface (6) of the crawler body (2) before and after
Circumferential length covering the projection surface of the two core metal wings (4A) in contact
The lug (7) having a height (W) to the width of the crawler body (2)
Distribute to the left and right from the center in the direction
The center of each lug (7) is reversed from the center of the front and rear mandrel (4)
The lug (7) and the front and rear cores (4)
Direction overlap length, and the left and right protrusions
The parts (15) and (16) are provided on the inner peripheral surface of the crawler body (2).
Protruded, circumferentially offset in opposite directions and point symmetric
An elastic crawler characterized by being formed in . 2. The left and right projections (15) and (16)
Has a set of front and rear guide projections (F) and (R) separated in the circumferential direction
Between the front and rear guide projections (F) and (R).
Guide projection of one of the projections
The cleavage (U) is the front and rear guide projection (F) of the other projection.
(R) and almost the entire width overlap in side view
And the claw in the guide projection valley (U)
The same material as the rubber body (2) or an elastic material of higher hardness
The elastic projection (18) is made of one piece with the crawler body (2).
The elastic crawler according to claim 1, wherein the elastic crawler is formed into a body .