WO1998025773A1 - Tire construction - Google Patents

Abstract

A tire construction capable of suppressing deformation to prevent generation of heat and improve durability. Thus a tire is molded into integral construction to have a multiplicity of lugs (21), a projection (21B) is formed to extend from the top (21a) of a lug (21) toward a hollow portion (22A), and the hollow portion (22A) has a substantially U-shaped cross section in a direction perpendicular to an axis of rotation of a rim (15). Also, a projection (21A) may be formed to extend from a side of the rim (15) toward a hollow portion (22) so that the hollow portion (22) has a substantially inverted U-shaped cross section in the direction perpendicular to the axis of rotation of the rim (15).

Description

 Description Tya structure technology field

 The present invention relates to a tire of a wheeled construction vehicle, and more particularly to a tire structure in which a large number of lugs are arranged in a circumferential direction of a rim. Background technology

 Solid tires used in conventional construction vehicles and the like use solid rubber bonded or bolted to the outer periphery of the rim, but there is no danger of puncturing and the rigidity is high, so solid tires are used at work sites. Stable work is possible. However, since it is a solid tyre, the cushion performance is poor, there is a lot of vibration and the riding comfort is poor, and when driving for a long time at high speed, the temperature inside the solid tire rises and the rubber melts. There is.

 On the other hand, urban civil work has recently increased, and wheeled construction vehicles capable of traveling in urban areas and excavating at work sites have been developed. The requirements for the tires of this wheeled construction vehicle are that there is no risk of puncture, high rigidity, excellent stability during work, and the ability to withstand high-speed running in urban areas.

As a prior art for a tire having a rug segment that provides a comfortable ride and can run at high speed for a long time, for example, Japanese Patent Application Laid-Open No. 5-077044 has been proposed. This will be described with reference to FIGS. 16 and 17. The tire is provided with a main body (lag segment) 73 configured to be elastically deformed under a load, and a tread provided on the main body # 3. The tread includes a plurality of ridges 75 provided circumferentially and between which a groove 78 is defined. Each ridge 75 includes a first central portion 7 and a pair of side portions 79 each extending outwardly from the central portion 77 toward one side of the body 73. Side portions 79 define a V-structure. The first central part 7 7 The V-shaped structure extends from the V-shaped structure toward the V-shaped structure of the adjacent raised portion 75 in a direction away from the outer edge of the portion 79. Further, an opening (hollow portion) 73 a is formed in the main body 73.

 According to such a conventional technique, the shape of the hollow portion 73 a provided in the lug segment 73 is, as shown in FIG. 18, the vertical direction in the F 1 direction received when the lug segment 73 is grounded. It is elastically deformed by load and lateral load in F2 direction. For this reason, the ends 73X, 73W of adjacent lug segments 73 come into contact with each other and rub against each other, generating heat. Therefore, when the rug segment 73 is run at a high speed, the heat and heat accelerate the wear and deterioration, and the rug segment 73 is significantly damaged. Therefore, there is a problem that the rag segment 73 needs to be replaced in a short time. Disclosure of the invention

 The present invention focuses on the problems of the prior art described above, and provides a tire structure capable of suppressing deformation, preventing heat generation, and improving durability even when a vertical load and a lateral load are applied during running of a vehicle. The purpose is to: Further, it is another object of the present invention to provide a tire structure capable of reducing vibration and noise during traveling by having an integrated structure.

 A first invention of a tire structure according to the present invention relates to a tire structure in which a large number of lug segments each having a hollow portion are arranged adjacent to each other in a circumferential direction of an outer periphery of a rim.

The plurality of lug segments are formed into an integrated structure having a number of lugs, and a protrusion extending from the top side of the lug toward the hollow portion is formed, and the hollow portion in a direction perpendicular to the rotation axis of the rim is formed. Has a substantially U-shaped cross section.

 A second invention of the tire structure according to the present invention is directed to a tire structure in which a large number of lug segments each having a hollow portion are arranged adjacent to each other in a circumferential direction of an outer periphery of a rim.

The plurality of lug segments are formed into an integral structure having a number of lugs, a projection extending from the rim side toward the hollow portion is formed, and a cross section of the hollow portion in a direction perpendicular to the rotation axis of the rim is formed. It is characterized by a substantially inverted U-shape.

According to the above-described first and second configurations, since the tire has an integral structure, each of the tires under load is The deformation of the lugs is continuous, and the vibration and noise during running are reduced. In addition, since the deformation of the lug in the front and rear directions is reduced, heat generation inside the tire is reduced. Since the number of parts is small, parts management becomes easy and the cost is low. Also, even if an excessive vertical load is applied to the lug while the vehicle is running, the tip of the protrusion and the inner ceiling of the lug are supported, so there is no significant deformation. Therefore, since large distortion and heat generation are suppressed, premature wear and deterioration are prevented, and durability is improved.

 Further, a fluid sealing chamber in which a fluid is sealed may be provided in a hollow portion formed by the lug and the projection. According to such a configuration, even when a vertical load and a lateral load are received during running of the vehicle, the load is supported by the fluid movement resistance generated when the lug is deformed, that is, the repulsive force of the fluid. This reduces the load on the inner wall of the lug and reduces the amount of deformation, thereby preventing premature wear and damage and improving durability. Also, at the tip of the projection, a projection is formed at the front part and the rear part in the rotation direction of the rim, and a first throttle part formed between the projection and the inner wall of the lug, and a fluid formed inside the projection part A passage that serves as a bypass for the enclosing chamber and a second throttle formed in the passage may be provided.

 According to this configuration, when the lug is suddenly deformed due to a vertical load and a lateral load during running of the vehicle, the fluid in the fluid filling chamber moves through the throttle portion, so that the pressure of the fluid increases. I do. The rising pressure generates a repulsive force of the fluid, thereby supporting the lug and reducing the load on the inner wall of the lug. Therefore, since the amount of deformation of the inner wall of the lug is small, premature wear and damage are prevented, and durability is improved.

 The third invention of the evening structure according to the present invention is a tire structure in which a large number of lug segments each having a hollow portion are arranged adjacently in the circumferential direction of the outer periphery of the rim.

The plurality of lug segments are formed into an integral structure having a plurality of lugs, and are fixed to a rim and extend toward the hollow portion, and are provided with rigid projections provided separately from the lugs. It is characterized by having.

According to such a configuration, since the tire has an integral structure, deformation of each lug under load Becomes continuous, and vibration and noise during driving are reduced. In addition, since the deformation of the lug in the front-rear direction decreases, heat generation inside the tire decreases. Even if a vertical load is applied while the vehicle is running, the lugs do not undergo significant deformation because the rigid protrusions and the inner ceiling of the lug support the vertical load. By using the projection having such rigidity, the lug is extremely hardly deformed, and is useful for a large vehicle having a large vehicle weight. In addition, since heat generation is suppressed, early wear and deterioration are prevented, and durability is improved.

 Further, a fluid sealing chamber in which a fluid is sealed may be provided in a hollow portion formed by the lug and the projection. With such a configuration, the same operation and effect as described above can be obtained. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a side view of a wheeled construction vehicle according to the present invention.

 FIG. 2 is a diagram illustrating a tire mounting structure according to the present invention.

 FIG. 3 is a perspective view of a wheel on which a tire according to the first embodiment of the present invention is mounted. FIG. 4 is an explanatory view of the tire lug of FIG. 3 from the side.

 FIG. 5 is an explanatory diagram when the lug in FIG. 4 is grounded.

 FIG. 6 is an explanatory view from the side of a lug of a tire according to a second embodiment of the present invention. FIG. 7 is an explanatory diagram when the lug in FIG. 6 is grounded.

 FIG. 8 is a perspective view of a wheel on which a tire according to a third embodiment of the present invention is mounted. FIG. 9 is an explanatory view of a tire lug according to a fourth embodiment of the present invention as viewed from the side. FIG. 10 is an explanatory diagram when the lug in FIG. 9 is grounded.

 FIG. 11 is a cross-sectional view of FIG.

 FIG. 12 is a cross-sectional view taken along line 12-12 of FIG.

 FIG. 13 is a perspective view of a tire according to a fifth embodiment of the present invention.

 FIG. 14 is an explanatory view of a tire lug according to a fifth embodiment of the present invention as viewed from the side. FIG. 15 is an explanatory diagram when the lug in FIG. 14 is grounded.

FIG. 16 is an explanatory view of a lag segment of a conventional tire structure. FIG. 17 is an explanatory diagram of the lag segment in FIG.

 FIG. 18 is an explanatory diagram when the lug segment in FIG. 17 is grounded. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the tire structure according to the present invention will be described.

 First, a wheeled construction vehicle 5 (hereinafter referred to as a vehicle 5) shown in FIG. 1 includes a lower traveling structure 1 on which tires 20 are rotatably disposed, an upper revolving structure 2 on which a cab 3 is mounted, and a vehicle. -Equipped with a work machine 4 having a robot, an arm and a bucket. As shown in FIG. 2, a rim 15 is connected to a driving device 10 such as a hydraulic motor. The rim 15 is attached to a tire 20 having a lug 21 made of an elastic material such as rubber and a bolt 20A. Fig. 2 shows the structure of a single tire 20, but double tires may be used.

 A first embodiment of the tire structure of the present invention will be described. As shown in FIG. 3, the integrally structured tire 20 has a large number of lugs 21 formed on the outer periphery and is attached to the rim 15 by a plurality of bolts 20A. A hollow portion 22 is formed inside each lug 21, and the hollow portion 22 opens at an end in the width direction of the tire 20.

 As shown in FIG. 4, the tire 20 is attached to the rim 15 by a plurality of ports 20A via a wire belt 35 embedded on the inner peripheral side of the tire 20. Each lug 21 has a projection 21A forming a substantially inverted U-shaped hollow portion 22. The top 21 a of the lug 21 is formed in a substantially trapezoidal shape. The hollow portion 22 is formed so as to surround the protruding portion 21A and over the entire width of the lug 21 and has a tubular shape. Since the lugs 21 form the hollow portions 22, the cushioning properties are improved, and the problem that the conventional solid tires (solid tires) have poor ride comfort is solved.

Next, the operation of FIG. 4 will be described with reference to FIG. When the top 21a of the lug 21 comes into contact with the ground by the traveling of the vehicle 5, a vertical load F1 and a lateral load F2 are applied to the lug 21. For vertical load F 1, inner ceiling 2 1 U of lug 2 1 and tip 2 1 A of protrusion 21 A The lugs 21 are not greatly deformed because they are in contact with and supported. On the other hand, with respect to the lateral load F2, the lug 21 is supported by the lugs 21 and 21 before and after the grounded lug 21 (in the rotational direction of the rim 15), so that the deformation is reduced. Is suppressed. In addition, the lateral load F 2 is applied, so that the side surface 21 S of the projection 21 A and the inner wall 21 W of the lug 21 are supported in contact with each other, so that the deformation of the lug 21 is suppressed.

 As described above, the lug 21 is not significantly deformed even under the vertical load F 1 and the lateral load F 2, so that the heat generation inside the lug 21 is suppressed, and the early wear and deterioration of the lug 21 are reduced. Is prevented and durability is improved. Further, as compared with the conventional rag-segment type tire, the deformation of each lug 21 under load becomes continuous, so that vibration and noise during traveling are reduced.

 A second embodiment of the tire structure of the present invention will be described. The second embodiment is an example in which the substantially inverted U-shaped hollow portion 22 of the first embodiment shown in FIG. 4 is formed in the opposite direction. In FIGS. 6 and 7, the lug 21 has a projection 21 B forming a substantially U-shaped hollow portion 22 A. When the vertical load F1 and the lateral load F2 are applied by the traveling of the vehicle 5, the deformation of the lug 21 is suppressed by the same operation as in the first embodiment. Therefore, similarly to the first embodiment, heat generation inside the lug 21 is suppressed, and durability is improved. Also, vibration and noise during driving are low.

A third embodiment of the tire structure of the present invention will be described. The third embodiment is an example in which the hollow portion 22 (see FIG. 3) of the first embodiment is used as a fluid-filled chamber. As shown in FIG. 8, a substantially inverted U-shaped hollow portion is formed between the top 21 a of each lug 21 and the rim 15, and a fluid is sealed in this hollow portion to form a fluid sealing chamber. 4 and 4. As a result, even if the lug 21 receives the vertical load F 1 and the lateral load F 2 while the vehicle 5 is running, the lug 21 is supported by the repulsive force of the fluid generated in the fluid filling chamber 44 when the lug 21 is deformed. Is done. For this reason, the load on the side wall of the lug 21 is reduced, the amount of deformation of the side wall is small, and the heat generation inside the lug 21 is reduced. As a result, early wear and deterioration can be prevented, and the durability is improved. The same operation and effect as in the present embodiment can be obtained by using the hollow portion 22A of the second embodiment as the fluid sealing chamber. A fourth embodiment of the tire structure of the present invention will be described. The lug 21 shown in FIG. 9 includes a projection 21F that forms a substantially inverted U-shaped fluid sealing chamber 54. The lug 21 has a tubular fluid-filled chamber 54 formed over the entire width of the lug 21 so as to surround the projection 21F. The top 21 a of the lug 21 is formed in a substantially trapezoidal shape. Protrusions 55 e and 55 e are formed over the entire width of the lug 21 at the front and rear ends of the protrusion 21 F. In the projection 21F, passages 55a and 55b for the fluid 53 are formed at a plurality of locations in the entire width direction of the lug 21. The cross-sectional shape of the passages 55a and 55b is appropriately selected, such as a hole or a rectangle. The plurality of passages 55a and the plurality of passages 55b communicate with each other via a plurality of hole-shaped throttle portions (second throttle portions) 55c.

 In FIG. 11, a plurality of passages 55a are opened in the protrusion 21F. A half-moon-shaped narrowed portion (first narrowed portion) 55 f is formed on the convex portions 55 e and 55 e. Under no load, a gap Q is provided between the inner wall of the lug 21 and the projections 55e, 55e. When a vertical load F 1 and a lateral load F 2 are applied thereto (the state shown in FIG. 10), as shown in FIG. 12, the inner wall of the lug 21 comes into contact with the projections 55 e and 55 e, The gap Q becomes the opening, and the aperture 55 f functions as the aperture.

 Next, the operation will be described with reference to FIG. When the top 21 a of the lug 21 comes into contact with the ground by the traveling of the vehicle 5, a vertical load F 1 and a lateral load F 2 are applied to the lug 21. When the vertical load F1 and the lateral load F2 are applied, the fluid filling chamber 54 is distorted, so that the fluid 53 in the fluid filling chamber 54 passes through the throttle portions 55c and 55f. At this time, a repulsive force of the fluid 53 is generated due to the resistance at the throttle portions 55c and 55f. Since the vertical load F1 is supported by the repulsive force of the fluid 53, the lug 21 is not significantly deformed. As a result, the load applied to the lug 21 on the inner wall decreases, and the distortion decreases. As a result, heat generation inside the rubber or the like forming the lug 21 is suppressed, so that early wear and deterioration of the lug 21 are prevented in the same manner as in the above embodiment.

A fifth embodiment of the tire structure of the present invention will be described. FIG. 13 shows a tire 20 having an integral structure. Many lugs 61 are formed on the outer periphery of the tire 20. A fluid sealing chamber 64 is formed inside each lug 61. As shown in FIG. 14, a metal projection (a rigid projection) 65 is fixed to the rim 15 via a support plate 66 with a bolt 67 or the like. In the present embodiment, the metal protrusions 65 are used as the rigid protrusions 65.However, the required characteristics are to suppress the deformation that occurs when the vertical load F1 and the lateral load F2 are applied. That is. Therefore, the protrusion 65 having rigidity can be used as long as the member has higher rigidity than the rigidity of the member used for the lug 21.

 A fluid enclosing chamber 64 for enclosing the fluid 63 is formed so as to surround the metal protrusion 65. Protrusions 65 a and 65 a are formed before and after the tip of the metal protrusion 65. The front and rear convex portions 65a, 65a may be provided on only one side, and the convex portions 65a may not be formed. The protruding portions 65 a and 65 a come into contact with the inner wall of the lug 61 when the tire 20 is distorted. A hollow portion 64 a is formed inside the metal protrusion 65.

 Next, the operation of FIGS. 13 and 14 will be described with reference to FIG. Since the fluid-filled chamber 64 and the metal projection 65 protruding into the fluid-filled chamber 64 are provided inside the lugs 61 formed around the integral tyre 20, the vehicle Even if a vertical load F 1 is received during the traveling of 5, the fluid is supported by the repulsive force of the fluid generated in the fluid filled chamber 64. In addition, even when the lateral load F 2 is received, the metal protrusion 65 is supported by being in contact with the protrusions 65 a and 65 a of the metal protrusion 65 and the inner wall of the fluid sealing chamber 64 of the lug 61. Since the lugs 61 are integral and continuous in the circumferential direction, lateral distortion is minimized.

Even when a larger vertical load F 1 and a lateral load F 2 are applied, the protrusions 65 a and 65 a of the metal protrusion 65 and the inner wall of the lug 61 contact and are supported. There is no deformation. In addition, since the hollow portion 64a is formed inside the metal protrusion 65, the lug 21 becomes lighter. As a result, in the tire 20 of the present invention having the fluid-filled chamber 64 of the present invention, the lug 21 is continuously deformed and the like, the friction with the road surface is suppressed to a small value, and no heat is generated. Prevents wear and deterioration and improves durability. As described above, the tire structure of the present invention has been described using the wheeled construction vehicle 5. However, it is needless to say that the tire structure can be applied to other construction vehicles such as crane vehicles and wheel loaders, and industrial vehicles. Industrial applicability

 INDUSTRIAL APPLICABILITY The present invention is useful as a tire structure capable of suppressing deformation, preventing heat generation, and improving durability even when a vertical load and a lateral load are applied during running of a vehicle.

Claims

The scope of the claims 1. In a tire structure in which a large number of lug segments having a hollow portion are arranged adjacent to each other in the circumferential direction of the outer periphery of the rim,  Forming the plurality of lug segments (73) into an integral structure having a number of lugs (21);  A projection (21B) extending from the top (21a) side of the lug (21) toward the hollow portion (22A) is formed, and the hollow in a direction perpendicular to the rotation axis of the rim (15) is formed. Tyer structure characterized in that the section (22A) has a substantially U-shaped cross section. 2. In a tire structure in which a large number of lug segments having a hollow portion are arranged adjacently in the circumferential direction of the outer periphery of the rim,  Forming the plurality of lug segments (73) into an integral structure having a number of lugs (21);  Forming a protrusion (21A) extending from the rim (15) side toward the hollow portion (22); and a cross-sectional shape of the hollow portion (22) in a direction perpendicular to a rotation axis of the rim (15). The tire structure has a substantially inverted U-shape. 3. In the tire structure according to claim 1 or 2,  A tire structure, characterized in that a fluid sealing chamber (44) in which a fluid (53) is sealed is provided in a hollow portion (22) formed by the lug (21) and the protrusion (21A). 4. The tire structure according to claim 3,  Protrusions (55e, 55e) are formed at the tip of the projection (21F) at the front and rear in the rotation direction of the rim (15), A first throttle portion (55f, 55f) formed between the protrusion (21F) and an inner wall of the lug (21); and a fluid sealing chamber (55) formed inside the protrusion (21F). 54) A tire structure, comprising: a passage (55a, 55b) formed in the tire; and a second throttle portion (55c) formed in the passage (55a, 55b). 5. In a tire structure in which a large number of lug segments having a hollow portion are arranged adjacent to each other in the circumferential direction of the outer periphery of the rim,  Forming the plurality of lug segments (73) into an integral structure having a number of lugs (21);  A rigid projection (65) fixed to the rim (15) and extending toward the hollow portion (22) and provided separately from the rug (21). The evening structure. 6. The tire structure according to claim 5,  A tire structure wherein a fluid sealing chamber (64) for sealing a fluid (63) is provided in a hollow portion (22) formed by the lug (21) and the projection (65).