CN107187277B

CN107187277B - Tire for port machinery

Info

Publication number: CN107187277B
Application number: CN201710404982.4A
Authority: CN
Inventors: 陈秀雄
Original assignee: Cheng Shin Rubber Xiamen Ind Ltd
Current assignee: Cheng Shin Rubber Xiamen Ind Ltd
Priority date: 2017-06-01
Filing date: 2017-06-01
Publication date: 2023-03-24
Anticipated expiration: 2037-06-01
Also published as: CN107187277A

Abstract

The invention discloses a tire for harbor machinery, which comprises a left pattern tread and a right pattern tread, wherein the land ratio of the pattern tread on one side is greater than or equal to the land ratio of the pattern tread on the other side; the pattern groove depths of the pattern treads of the two parts are provided with groove depth differences; the profile of the tire section adopts an asymmetric design, so that the abnormal abrasion phenomenon generated by using the tire in a special environment is avoided.

Description

Tire for port machinery

Technical Field

The invention relates to a tire for engineering machinery, in particular to a tire for harbor machinery.

Background

The harbor machinery has special operation environment, high tire operation intensity, large load and long working time, so the tire tread of the harbor tire is required to have excellent wear resistance and good heat dissipation performance. In addition, abnormal wear phenomena commonly occur in the use process of port tires, for example, as shown in fig. 1, an installation layout diagram of a conventional port machinery vehicle tire is shown, a pair of front wheels a are installed at two wheel positions of a front vehicle body, a rear wheel B is installed at a rear vehicle body wheel position, and because of large vehicle body load capacity, the rear wheel B turns frequently, turns at a large angle and turns in place, the front wheel a cannot turn in a large range during turning, so that the front wheel a is dragged to move forward, and the contour of the conventional tire is symmetrical about an equatorial plane, the tread ground contact pressure at the turning side is greater than that at the other side, deformation at two sides of the tread is inconsistent, so that abnormal wear occurs, and an area a shown in fig. 1 is an abnormal partial wear area.

The existing method is to solve the problem of abnormal abrasion by using left and right tires to be exchanged when patterns are worn to 50%, but the unilateral tread of the exchanged tires is stressed too much, so that the unilateral tread is abraded more quickly, the phenomena of delamination, bulging and the like are easy to occur, the mechanical work is suspended, and the working efficiency is influenced.

The publication No. CN202046163 discloses a tire characterized in that half of the tread is in the form of blocks, and the other half is in the form of a tread pattern of a plain tire to prevent early damage of the tire, however, the half-plain tire has a single-sided tread at the early stage of the tire use, the heat dissipation effect is not good, and in addition, the profile of the tire is symmetrical about the equatorial plane, and the deformation of both sides of the tread is not uniform under a special working environment, so that the tire has an insignificant effect on preventing abnormal wear.

Disclosure of Invention

The invention aims to provide a tire for harbor machinery, which can improve abnormal abrasion phenomenon while giving consideration to heat dissipation of the tire.

In order to achieve the above purpose, the solution of the invention is:

a tire for a harbour machine, wherein: the tire tread consists of a left pattern tread and a right pattern tread, wherein the land ratio of the pattern tread on one side is larger than or equal to that of the pattern tread on the other side; the pattern groove depths of the pattern treads of the two parts are provided with groove depth differences; the profile of the tire section adopts an asymmetric design.

The tread with the patterns on one side is composed of a plurality of transverse main grooves, the transverse main grooves extend from the central line of the tread to the direction of the shoulder on one side, and the transverse main grooves are formed by sequentially connecting a first fold groove, a second fold groove and a third fold groove.

The groove depth of the first fold line groove and the second fold line groove is 60mm to 80mm; the third fold line ditch is designed in a multi-step mode, wherein the height of a first step adjacent to the ditch bottom is from 20mm to 30mm, and the height of a second step adjacent to the ditch top is from 20mm to 30mm.

The tread with patterns on the other side consists of a plurality of inner transverse auxiliary grooves, outer transverse auxiliary grooves, inner shallow straight grooves circumferentially connected with the inner transverse auxiliary grooves and outer shallow straight grooves circumferentially connected with the outer transverse auxiliary grooves; the inner transverse auxiliary groove and the third fold line groove are butted and extend from the central line of the tread to the direction of the tire shoulder at the other side to be used as the extension of the third fold line groove; the outer transverse auxiliary groove is arranged at a tire shoulder position between the circumferential directions of two adjacent inner transverse auxiliary grooves and extends from the tire shoulder position to the center direction of the tire surface; the circumferential distance between the outer transverse auxiliary groove and the previous inner transverse auxiliary groove is equal to the circumferential distance between the latter inner transverse auxiliary groove.

The depth of the inner transverse auxiliary groove is 10% -20% of that of the first fold line groove; the depth of the inner shallow straight groove is 5% -10% of the depth of the first fold line groove.

The depth of the outer transverse auxiliary groove is 10% -20% of the depth of the first fold line groove; the depth of the outer shallow straight groove is 5% -10% of the depth of the first fold line groove.

The tread width of the tread with the patterns on one side is 50% -75% of the tread width of the tire.

The land ratio of the tread with the patterns on the other side is 1.2 to 1.8 times of the land ratio of the tread with the patterns on one side.

The deepest groove depth of the tread with the pattern on the other side is 10% -50% of the deepest groove depth of the tread with the pattern on one side.

The radial distance from the position of the tire shoulder of the outer section outline of the pattern tread on one side to the maximum outer diameter of the tire is 1.5 to 2 times that from the position of the tire shoulder of the outer section outline of the pattern tread on the other side to the maximum outer diameter of the tire.

The solution of the invention is improved by an optimized design combining an asymmetric tire tread and an asymmetric tire profile. The tire tread consists of a left pattern tread and a right pattern tread, wherein the land ratio of the pattern tread on one side is greater than or equal to that of the pattern tread on the other side, and the asymmetric tire tread is matched, and the profile of the tire also adopts an asymmetric design, so that the heat dissipation performance of the tire is ensured, and the abnormal abrasion phenomenon generated when the tire is used in a special environment is improved.

Drawings

FIG. 1 is a schematic view of the installation layout of the tires of the current harbor machinery vehicle;

FIG. 2 is a schematic view of a tread pattern of a tire according to an embodiment of the present invention;

FIG. 3 isbase:Sub>A schematic structural view ofbase:Sub>A cross section A-A ofbase:Sub>A tire according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are explained below with reference to the drawings:

as shown in FIG. 2 and FIG. 3, the present invention discloses a tire for harbor machinery, which is composed of left and right pattern treads, wherein the land ratio of one pattern tread 1 is lower than that of the other pattern tread 2; the pattern groove depths of the pattern treads 1 and 2 of the two parts are provided with groove depth differences; the profile of the tire section adopts an asymmetric design. The "land ratio" referred to herein means that when the total area of a certain region of the tread is s and the block area of the region is a, the ratio of the block area of the region to the total area of the region is referred to as the land ratio i of the region, that is: i = a/s.

The port machinery tire tread is provided with a tread surface 2 with a tread surface 1 with a pattern on the other side, preferably, the tread width W1 of the tread surface 1 with the pattern on one side is 50% -75% of the tread width W of the tire, the width of the tread surface 1 with the pattern on one side is not too large, abnormal abrasion is not obvious enough if the width is too large, meanwhile, the width is not too small, and the heat radiation performance of the tire is affected if the width is too small.

The land ratio of the pattern tread 2 on the other side is preferably 1.0 to 1.8 times the land ratio of the pattern tread 1 on one side. The land ratio difference between the two treads is not too small, the effect of improving abnormal abrasion is not obvious enough when the land ratio difference is too small, the land ratio difference is not too large, and the heat dissipation performance of the tire is influenced when the land ratio difference is too large.

When the tire is used, the pattern tread 2 on the other side is arranged on one side with abnormal abrasion, and the pattern tread 2 on the other side has larger unit grounding area, so that the tread pressure of the whole tire can be equalized, and the tread of the tire is uniformly abraded.

In order to further prevent abnormal wear of the tire, it is preferable that a groove depth difference is provided between the groove depths of the one side pattern tread 1 and the other side pattern tread 2, and the tread pressure distribution is balanced by adjusting the strength difference of the treads by the groove depth difference, and the treads are uniformly worn, and the deepest groove depth H5 of the other side pattern tread 2 is 10% to 50% of the deepest groove depth H1 of the one side pattern tread 1. The groove depth should not be too large, and too large will not improve the abnormal wear effect is obvious enough, and at the same time, the groove depth should not be too small, and too small will affect the heat dissipation performance of the tire.

In order to prevent abnormal wear of the tire even further, the cross-sectional profile 111 of the pattern tread 1 on one side and the cross-sectional profile 222 of the pattern tread 2 on the other side are designed asymmetrically. The outer section profile 111 of the tread 1 on one side is tangent to the outer section profile 222 of the tread 2 on the other side to ensure uniformity of the contact patch. The radial distance from the position of the tire shoulder of the outer section outline 111 to the position of the maximum outer diameter of the tire is L3, the radial distance from the position of the tire shoulder of the outer section outline 222 to the position of the maximum outer diameter of the tire is L4, and preferably L4 is 1.5 to 2 times of L3.

The tread 1 with the patterns on one side is composed of a plurality of transverse main grooves 11, the transverse main grooves 11 extend from the central line 3 of the tread to the direction of the shoulder on one side, the transverse main grooves 11 are composed of a first fold line groove 1a, a second fold line groove 1b and a third fold line groove 1c, and the design of the multi-fold grooves balances the rigidity of the tread in the axial direction and the circumferential direction and prevents abnormal abrasion.

The groove depths h1 and h2 of the first folding groove 1a and the second folding groove 1b are designed to be ultra-deep grooves, preferably from 60mm to 80mm, so that the heat dissipation performance of the tire is fully exerted, the third folding groove 1c is designed to be multi-step, the second folding groove is designed to be two-step, the first step 1c1 is arranged adjacent to the groove bottom, the height h3 is preferably from 20mm to 30mm, the second step 1c2 is arranged adjacent to the groove top, the height h4 is preferably from 20mm to 30mm, and the multi-step design ensures the heat dissipation performance of the tire and can enhance the strength of the center of the tire tread.

The tread 2 with the pattern on the other side is composed of a plurality of inner transverse auxiliary grooves 21, outer transverse auxiliary grooves 22, inner shallow straight grooves 23 connected with the inner transverse auxiliary grooves 21 and outer shallow straight grooves 24 connected with the outer transverse auxiliary grooves 22 in the circumferential direction.

The inner transverse auxiliary groove 21 and the third fold line groove 1c are in butt joint and extend from the tread center line 3 to the other side tire shoulder direction to serve as the extension of the third fold line groove 1c, so that transition connection between the pattern tread 1 on one side and the pattern tread 2 on the other side is smooth, abnormal abrasion is avoided, the groove depth h5 of the inner transverse auxiliary groove 21 is preferably 10% -50% of the groove depth h1 of the first fold line groove 1a, the groove depth h5 is not too large, the effect of improving the abnormal abrasion is not obvious enough, the groove depth h5 is not too small, and the heat radiation performance of the tire is influenced by too small size.

In the circumferential direction, adjacent inner transverse auxiliary grooves 21 are connected in the circumferential direction through inner shallow straight grooves 23, the pressure of large pattern blocks can be dispersed through the design of the inner shallow straight grooves 23, abnormal abrasion of the tire caused by overlarge local pressure of the tire surface is avoided, 5% -10% of the groove depth h1 of the first fold line groove 1a is preferably selected as the groove depth h6 of the inner shallow straight grooves 23, the groove depth h6 of the inner shallow straight grooves 23 is not too large, the effect of improving the abnormal abrasion excessively is not obvious, the groove depth h6 of the inner shallow straight grooves 23 is not too small, and the heat dissipation performance of the tire is influenced by undersize.

The outer lateral sub-groove 22 is provided at a shoulder position between two adjacent inner lateral sub-grooves 21 in the circumferential direction and extends from the shoulder position toward the tread center direction, and preferably, a circumferential distance L1 between the outer lateral sub-groove 22 and a preceding inner lateral sub-groove 21 is equal to a circumferential distance L2 between the following inner lateral sub-grooves 21. The L1= L2 arrangement is used for balancing the unit grounding area of each position of the tread and avoiding abnormal abrasion. The groove depth h7 of the outer transverse auxiliary groove 22 is preferably 10% -50% of the groove depth h1 of the first fold line groove 1a, the groove depth h7 of the auxiliary groove 22 is not too large, the effect of improving abnormal abrasion is not obvious enough, and the groove depth h7 of the outer transverse auxiliary groove 22 is not too small, and the heat radiation performance of the tire is affected.

In the circumferential direction, two adjacent outer transverse auxiliary grooves 22 are connected by outer shallow straight grooves 24. The design of the outer shallow straight groove 24 can disperse the pressure of the large pattern block, abnormal abrasion of the tire caused by overlarge local pressure of the tire tread is avoided, the groove depth h8 of the outer shallow straight groove 24 is preferably 5% -10% of the groove depth h1 of the first fold line groove 1a, the groove depth h8 of the outer shallow straight groove 24 is not too large, the effect of excessively improving the abnormal abrasion is not obvious enough, the groove depth h8 of the outer shallow straight groove 24 is not too small, and the heat dissipation performance of the tire is influenced by the undersize.

The above description is only exemplary of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above exemplary embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims

1. A tire for harbor machinery, characterized in that: the tire tread consists of a left pattern tread and a right pattern tread, wherein the land ratio of the pattern tread on one side is larger than or equal to that of the pattern tread on the other side; the pattern groove depths of the pattern treads of the two parts are provided with groove depth differences; the profile of the tire section adopts an asymmetric design; the tread with the patterns on one side is composed of a plurality of transverse main grooves, the transverse main grooves extend from the central line of the tread to the direction of the shoulder on one side, and the transverse main grooves are formed by sequentially connecting a first fold line groove, a second fold line groove and a third fold line groove; the tread with patterns on the other side consists of a plurality of inner transverse auxiliary grooves, outer transverse auxiliary grooves, inner shallow straight grooves circumferentially connected with the inner transverse auxiliary grooves and outer shallow straight grooves circumferentially connected with the outer transverse auxiliary grooves; the inner transverse auxiliary groove and the third fold line groove are butted and extend from the central line of the tread to the direction of the tire shoulder at the other side to be used as the extension of the third fold line groove; the outer transverse auxiliary groove is arranged at a tire shoulder position between the circumferential directions of two adjacent inner transverse auxiliary grooves and extends from the tire shoulder position to the center direction of the tire surface; the circumferential distance between the outer transverse auxiliary groove and the previous inner transverse auxiliary groove is equal to the circumferential distance between the latter inner transverse auxiliary groove; the depth of the inner transverse auxiliary groove is 10% -20% of that of the first fold line groove; the depth of the inner shallow straight groove is 5% -10% of the depth of the first fold line groove.

2. The tire for a harbour machine according to claim 1, wherein: the groove depth of the first fold line groove and the second fold line groove is 60mm to 80mm; the third fold line groove adopts a multi-step design; wherein the first step height adjacent to the trench bottom is 20 mm-30mm, and the second step height adjacent to the trench top is 20 mm-30mm.

3. The tire for a harbour machine according to claim 1, wherein: the depth of the outer transverse auxiliary groove is 10% -20% of the depth of the first fold line groove; the depth of the outer shallow straight groove is 5% -10% of the depth of the first fold line groove.

4. The tire for a harbour machine according to claim 1, wherein: the tread width of the tread with the patterns on one side is 50% -75% of the tread width of the tire.

5. Tire for harbour machinery according to claim 1 or 4, wherein: the land ratio of the pattern tread on the other side is 1.2 to 1.8 times of the land ratio of the pattern tread on one side.

6. The tire for a harbour machine according to claim 1, wherein: the deepest groove depth of the tread with the pattern on the other side is 10% -50% of the deepest groove depth of the tread with the pattern on one side.

7. The tire for a harbour machine according to claim 1, wherein: the radial distance from the position of the tire shoulder of the outer section outline of the pattern tread on one side to the maximum outer diameter of the tire is 1.5 to 2 times that from the position of the tire shoulder of the outer section outline of the pattern tread on the other side to the maximum outer diameter of the tire.