JP2578638Y2 - Rubber track lug pattern - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber track used for a suspension of a tracked vehicle of a construction machine such as a bulldozer or a hydraulic excavator, and more particularly to a rubber track rug pattern.

[0002]

2. Description of the Related Art Conventionally, in tracked vehicles of construction machines such as bulldozers and hydraulic excavators, an upper rolling wheel and a lower rolling wheel are provided on a track frame provided between an idler wheel and a starting wheel. The iron crawler is wound around each of these wheels, and the crawler is rotated by the power transmitted to the starting wheels so that the vehicle travels. In recent years, as a countermeasure against undercarriage noise and vibration, instead of the conventional iron crawler belt, a metal core is buried at regular intervals in an endless rubber belt, and the teeth of the starting wheel are engaged with this core to drive. Integral rubber tracks have also been used. The rubber crawler rug pattern currently used is, for example, a crawler belt 11 having a tread surface 12 and a ground lug 13 as shown in FIG. Rubber track 11 as shown
Engaging hole 1 with the starting wheel provided at the center in the width direction of
4 are provided at equal intervals along the longitudinal direction, and the central portion 13a of the lug 13 between the engagement holes 14 and the two central portions 13a adjacent to each other with the engagement engagement hole 14 interposed therebetween are connected to each other. Are provided, and the branch portions 13b are formed so as to be shifted left and right by one pitch. Therefore, the lugs 13 are alternately arranged, and have a shape in which the concave portion 15 exists between them.

[0003]

However, in order to suppress the poor workability due to the swinging of the vehicle body in the above-described rug pattern crawler belt, the land portion of the lug 13 which is the ground contact area of the rubber crawler belt 11 must be increased. Alternatively, the lug spring constant of the rubber crawler belt 11 must be increased by lowering the lug 13 height. Then, there is a problem that the volume of the concave portion 15 becomes small, the crawler belt 11 easily slips, and the traction force, which is one of important performances, becomes small.
That is, for example, FIG. 3 shows an example of a lug pattern in which the contact area (land portion of the lug 13) is cut to improve the performance of the tractive force shown in FIG. 2 described above. In this case, the volume of rubber is reduced. As a result, the durability and the spring constant are lowered, and the terrain is deteriorated.

[0004] In view of the above, the present invention provides a rubber track lag pattern capable of preventing the deterioration of workability due to the swing of the vehicle body and increasing the traction force, thereby solving the drawbacks of the prior art. The purpose is to achieve.

[0005]

In order to achieve the above object, a first aspect of the present invention is to provide an endless rubber belt wound around a traveling portion of a tracked vehicle with a metal core meshing with each tooth of a starting wheel. In the embedded rubber crawler belt, an engagement hole for engaging with the starting wheel is provided between adjacent core bars at the center in the width direction on the ground side of the rubber crawler belt, and provided between the adjacent engagement holes in the circumferential direction. The three pitches of the central portion of the lug are divided into a single lug and a compound lug in which two adjacent lugs are connected with an engaging hole interposed therebetween, and the lugs are alternately arranged. The lugs are arranged so as to be obliquely rearward and away from each other, and the left and right shapes of the lugs in the crawler belt width direction are arranged so as to be shifted by one pitch. It is formed so that the half width of the crawler belt and the recess of the crawler belt width exist alternately. And, a second aspect of the two lugs in claim 1, characterized by being formed so as to cross obliquely in succession at least the composite lugs three core metal projection plane adjacent respectively.

[0006]

According to the above arrangement, the spring constant of the crawler belt is kept large by the large ground pressure of the composite lug, and the swing of the vehicle body is suppressed. In addition, a single lug easily penetrates deeply into the soil even on hard ground, thereby increasing frictional resistance to the soil and increasing traction.
Further, the lug covers three pitches of the metal core, so that the flexural fatigue resistance of the crawler belt is improved, and the lug is also used for protection of the steel cord provided inside the rubber crawler belt.

[0007]

FIG. 1 shows a rubber track lug pattern according to the present invention.
FIG. 5 is a partial plan view of an embodiment (ground side).

Hereinafter, claims 1 and 2 of the present invention will be described with reference to an embodiment shown in FIG. Claim 1 of the present invention is a rubber crawler belt 1 in which an endless rubber belt wound around a traveling portion of a tracked vehicle is embedded with a metal core that meshes with each tooth of a starting wheel. A lug provided between the adjacent cored bars 2 and 2 (indicated by a dotted line) at the center in the width direction to engage with the starting wheel and provided between the adjacently engaged holes 3 and 3 in the circumferential direction. 4 between the three pitches L of the central portion 4a,
3 is divided into a composite lug 41 connecting two adjacent ones and a single lug 42 and arranged alternately.
The left and right branch portions 4b and 4c are formed so as to be away from the central portion 4a obliquely rearward, and the right and left shapes of the lug in the crawler belt width direction are displaced by one pitch and the composite lug is provided. The two lugs 41 are formed so that half width of the crawler belt 1 and concave portions 5 and 6 of the crawler belt width are alternately provided in the circumferential direction between 41 and the single lug 42. , 42, at least the composite lug 41
Are formed so as to continuously and obliquely traverse the projection planes of three adjacent metal cores 2.

A lug 4 of the rubber crawler belt 1 has a central portion 4a provided between the meshing engagement holes 3 adjacent in the circumferential direction,
A wide composite lug 41 that is continuous with two central portions 4a adjacent to each other with the engagement hole 3 interposed therebetween so as to keep the left and right branch portions 4b away from the diagonally rearward direction. A single lug 42 in which two adjacent central portions 4a are not continuous on one side (the right side from the center in the width direction in FIG. 1), and the branch portion 4c is substantially parallel to the branch portion 4b and is separated obliquely rearward. It consists of The other side of the single lug 42 (left side from the center in the width direction in FIG. 1) is a composite lug 4
1 and is continuous as a branch portion 4b, and the composite lug 41
On the other side, one is connected to the branch portion 4b of the composite lug 41 and the other is connected to the branch portion 4c of the single lug 42, so that the left and right lugs 4 are asymmetrical with respect to the center in the width direction of the rubber crawler belt 1. It has become. The composite lug 41 and the single lug 4
2, a recess 5 is formed between the widths of one half of the rubber crawler belt 1, the end of the crawler belt 1 being inclined obliquely rearward, and a single lug 42 is formed.
Similarly, between the rubber lug 41 and the composite lug 41, there is provided a crevice width recessed portion 6 whose end part is away from the center part obliquely rearward between the widths of the rubber crawler belt 1, so that the rubber crawler belt 1 has a large number with respect to the rubber belt. The lugs 4 are arranged discontinuously across the recess 6. The composite lug 41 is sequentially changed from a wide shape at the central portion 4a to a narrow shape at the branch portion 4b. Further, the slope 7 formed at the boundary between the top surface of the composite lug 41 and the concave portion 6 is constituted by a flat surface having a gradually decreasing inclination angle from the center toward the end. The slope 8 formed at the boundary between the top surface and the recess 5 and the boundary between the top surface of the single lug 42 and the recesses 5 and 6 are formed by planes having the same inclination angle from the center to the end. Have been. A core metal 2 meshing with each tooth of the starting wheel is embedded in the rubber crawler belt 1, and at least the composite lug 41 of the lugs 4 is continuously obliquely projected on the projection surface of three adjacent metal cores 2. It is formed so as to cross in the direction.

Next, the operation will be described. Of the lugs 4, the composite lug 41 keeps the spring constant of the crawler belt large due to the large ground contact surface, suppresses the swing of the vehicle body, and has a relatively elongated single lug 42.
Is easy to penetrate deep into the soil even on hard ground, increasing the frictional resistance to the soil, making it difficult for the track to slip and increasing traction. In addition, by increasing the number of the concave portions 6 as compared with the conventional case, the amount of soil digging in soft ground is increased, and as a result, crawler belt slip is reduced and traction force is increased. Further, by forming the lug 4 so as to cover three pitches of the metal core 2, the bending fatigue resistance of the crawler belt is improved, and the lug 4 is also used to protect the steel hood provided in the rubber belt of the crawler belt.

[0011]

[Effects of the Invention] As described above, the present invention relates to claim 1
In a rubber crawler belt in which an endless rubber belt wound around a traveling portion of a tracked vehicle is embedded with a metal core bar that meshes with each tooth of a starting wheel, an adjacent core at the center in the width direction on the ground side of the rubber crawler belt. An engaging hole for engagement with the starting wheel is provided between the gold, and three adjacent pitches of the central portion of the lug provided between the adjacent engaging holes in the circumferential direction are interposed between the two engaging holes. The combined lug and the single lug are divided and arranged alternately, and the left and right branch portions of both lugs are formed so as to be away from the central portion obliquely rearward, and the left and right in the crawler belt width direction of the lug are formed. Are arranged so as to be displaced by one pitch, and are formed so that a half width of the crawler belt and a recess of the crawler belt width alternately exist in the circumferential direction between the composite lug and the single lug. Item 2
In the above two lugs, at least the composite lug is formed so as to continuously and diagonally traverse three adjacent metal core projection surfaces, so that the ground contact area does not need to be greatly reduced as compared with the conventional one. In addition, it is possible to prevent the workability from deteriorating due to the swinging of the vehicle body, and to improve the bite into the soil due to the increase in the number of concave portions, so that the crawler belt slip is reduced and the traction force can be increased.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment showing a partial plane of a rug pattern of a rubber crawler belt according to the present invention.

FIG. 2 shows an example of a rug pattern portion of a conventional rubber crawler belt, in which (a) is a side view and (b) is a plan view.

FIG. 3 is an explanatory view showing an example of a case where the rug pattern of the rubber crawler belt of FIG. 2 is deformed by cutting in order to improve traction performance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber track 2 Core bar 3 Engagement hole 4 Lug 4a Central part 4b Branch part 4c Branch part 41 Composite lug 42 Single lug 5 Recess 6 Recess L 3 pitch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 55/253 B60C 11/11

Claims (2)

(57) [Scope of request for utility model registration] An endless rubber belt wound around a traveling portion of a tracked vehicle, in which a metal core metal meshing with each tooth of a starting wheel is embedded, and a central portion in the width direction of the rubber crawler belt on the grounding side. And an engaging hole for engaging with the starting wheel is provided between adjacent metal cores, and three pitches of the central portion of the lug provided between the adjacent engaging holes in the circumferential direction are adjacent to each other with the engaging hole interposed therebetween. The two lugs are divided into a composite lug and a single lug, which are arranged alternately, and the left and right branch portions of both lugs are formed so as to be away from the central portion obliquely rearward, respectively. The left and right shapes in the width direction are arranged so as to be shifted by one pitch, and between the composite lug and the single lug, a half width of the crawler belt and a concave portion of the crawler belt width alternately exist in the circumferential direction. A rug pattern of a rubber crawler, characterized in that the rug pattern is formed. 2. The rubber crawler belt according to claim 1, wherein at least the composite lug of the two lugs is formed so as to continuously and obliquely cross three adjacent metal core projection surfaces. Rag pattern.