JP2550685Y2 - Rubber track - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a rubber crawler mounted on a mobile agricultural machine, a construction machine or the like.

(Prior Art) In a conventional rubber track, as shown in FIG. 1 (perspective view), a metal core bar 1 is replaced with a metal core bar 1 shown in FIGS.
As shown in the figure, a large number of steel cords 3 are embedded in the rubber crawler body 2 at regular intervals in the circumferential direction, and
Are arranged and buried.

(Problems to be Solved by the Invention) As described above, the conventional rubber crawler has a metal core, which increases the weight of the entire rubber crawler. Noise due to friction with wheels and the like is large, and wear of both is large.

In addition, twisting as shown in FIG. 3 (plan view) often occurs during the turning of the vehicle, which causes the crawler to come off.

(Means for Solving the Invention) The present invention is intended to solve the above problems,
It is characterized by a pair of unit cores that are opposed to each other with a pair of angles protruding across the central engaging portion and that form a wing with a fixed width outside each corner. In addition to connecting the adjacent wings with a flat band with a fixed width, the continuous core body between the central engaging parts is an engaging hole into which the sprocket claw is fitted. Since a flat band formed by integrally connecting the core metal wings and the respective wings is embedded in the rubber material of the crawler body, and only the corners protrude, it is formed integrally with the body plastics. In this case, a concave portion can be provided in the middle portion of the flat band member, and a shoulder step portion serving as a contact surface of the outer collar wheel is provided at a position above the wing portion on both outer sides of the corner portion, A recess is provided between the matching shoulder steps and connected as a flat band, and the shoulder steps are embedded so that they match the top surface of the crawler body. It can be. In the above description, the thickness of the flat band is approximately the same as the thickness of the metal core wing.
It is preferable that the width is about 1/2 and that the width dimension is at least half the length of each blade of the unit core. A U-shaped metal piece can be embedded in a state of straddling the joint.

(Embodiment) FIG. 4 is a perspective view of a continuous core 4 used in the present invention, and a pair of corners 4'b, with a center engaging portion 4'a interposed therebetween.
4'b are opposed to each other in a protruding state, and unit cores 4 ', 4'. The wings are arranged side by side, and the wings are connected by bands 4'd, 4'd, so that the center engaging portion is provided with an engaging hole 4 '
e, 4′e... and are integrally formed in a continuous state with a high-hardness elastic plastic material.

At this time, the wings 4'c and 4'c are thick T and the band 4 '
d and 4'd are formed into a thin wall t, and the wall thickness dimension is designed to have an appropriate dimensional relationship depending on the weight of an agricultural machine, a construction machine, or the like. For example, T = 25 mm, t = 12 mm, and the synthetic resin material used is a polyurethane resin. The width dimension has at least half the length of each blade of the unit core.

FIG. 5 shows that the continuous core 4 having the above-described structure is connected to the rubber crawler body 2.
The thicker wings 4'c, 4'c have a high rigidity and perform the same function as a conventional metal core, and The bodies 4'd and 4'd have appropriate flexibility and rigidity to ensure engagement with the drive wheels and idler wheels, winding, and the like, and the sinking of the rolling wheels between the unit cores. Is to suppress. Also, the band 4'd,
Since the 4'd exists continuously and widely in the form of a flat plate between the front and rear wing portions 4'c and 4'c, the portion also has rigidity in the crawler width direction at this portion and does not twist, so that the crawler Detachment is unlikely to occur. Reference numerals 5 and 5 denote steel cords embedded in the rubber crawler body 2 so as to be divided into right and left sides with the engaging hole 4'e interposed therebetween.

In the above embodiment, the steel cords 5 and 5 are separately embedded in the rubber crawler main body 2 on the lower surface side of the continuous core 4, but as shown in FIG. The band may be implanted with the body to further increase the rigidity of the band. In addition, a steel cord can be used as an anti-stretch body, but a linear body made of an aromatic polyamide fiber can be used in addition to the steel cord. FIG. 6B
As shown in the sectional view, the metal pieces 6 can be embedded in the corners of the unit cores 4 ', 4',... To reinforce the rigidity of the continuous core 4.

In the present invention, the material of the continuous core is made of a high-hardness elastic plastic such as a polyurethane resin. For example, a casting type polyurethane resin is injected into a mold having a cavity for forming the continuous core, and then cured and molded. You do it. In this case, if a linear body such as a steel cord or the like is arranged and injected in advance in the cavity, the steel cord or the like can be embedded in the continuous core at the same time.

The method of manufacturing a rubber crawler by embedding the continuous core 4 in rubber according to the present invention is similar to the method of manufacturing a conventional rubber crawler, in which a continuous core, unvulcanized rubber, and the like are arranged in a mold. Then, the molding is performed by heating under pressure for a predetermined time. In this case, the surface of the continuous core body is subjected to surface treatment in advance so that the adhesion to the rubber can be strengthened.

On the other hand, there is also a method of manufacturing the rubber crawler body by first injecting and curing a polyurethane resin into a space provided in the rubber crawler body after the molding is performed. In this method, the same model as the continuous core body is embedded. After molding the rubber track,
The model is removed, and a polyurethane resin is injected into a space formed in the trace and cured, and it is preferable that the model can be disassembled to facilitate removal of the model.

On the other hand, a continuous core previously molded into an endless belt can be manufactured using a swan-neck press 7 in the same manner as a conventional rubber crawler.

FIGS. 7A (front view) and B (side view) show this state, where 8a and 8b are upper and lower molds, 9a and 9b are upper and lower heating plates, and 10 is a lower mold and a heating plate. Cylinders for 11
a and 11b are spacers for allowing the endless continuous core or the rubber crawler body after vulcanization to pass through.The continuous core is unvulcanized rubber for the upper and lower molds opened by the lowering operation of the cylinder 10. The vulcanization is carried out in a sandwiched state, and the production is carried out by repeating this several times.

On the other hand, a strip rubber crawler is molded using a long press die, and this is connected and detached with bolts and nuts 13 and 14 through connecting portions provided at both ends of the continuous core body in advance, and is a semi-movable semi-crawler. It can be an endless crawler. FIG. 8 shows this state.

In the example shown in FIG. 9, a concave portion 15 is provided in the intermediate portion of the belt of the continuous core, and when this is embedded in the rubber crawler main body 2,
As shown in FIG. 10, by providing a concave groove 16 on the inner peripheral surface of the rubber crawler body corresponding to the concave portion 15, it is easy to disperse the compression strain generated on the inner peripheral side of the rubber crawler body during winding. Thus, the bending and fatigue of the rubber track can be prevented, and the winding and engagement with the driving wheel and the idle wheel can be more reliably performed.

FIG. 11 shows still another example, in which A is a perspective view of a continuous core body, and B is a state diagram embedded in a rubber crawler body. In this example, shoulder shoulders 4'f, which are contact surfaces of the outer collar wheels, are provided extending in the front and rear directions in the circumferential direction at positions above the wings on both outer sides of the corners of the continuous core body. By providing a depression in the feeling and embedding so that each shoulder step coincides with the upper surface of the crawler body, the fall of the rolling wheel during running will be reduced,
The running vibration is greatly improved.

FIG. 12 shows the unit cores 4 ′, 4 ″, 4
In this figure, A is a view in which the pitch interval is reduced, A is a partial perspective view of the continuous core body, and B is a state diagram embedded in the rubber crawler main body 2. In this case, since the band interval is small, rigidity is excellent over the entire circumference of the rubber crawler body. In particular, the core wing part protruding in the width direction of the rubber crawler body increases the rigidity in the crawler width direction and at the same time increases the contact area with rubber,
The connection with the crawler body is strengthened.

In the above embodiment, the cross-sectional shape of the central engaging portion of the continuous core is not limited to the columnar shape, and may be any shape that matches the root shape of the drive wheel. The core body may have any shape with reference to the shape of the core metal used for a known rubber track.

(Effects of the Invention) The present invention is configured as described above. Since the core metal is not made of metal, the weight of the whole rubber crawler is reduced, and the friction between the driving wheels and the rolling wheels during traveling is reduced. In addition to reducing noise and abrasion, a flat band with a fixed width is interposed between the unit cores, which has the appropriate width and rigidity in the crawler width direction, causing twisting in this part. This prevents the crawler from coming off, and also suppresses the sinking of the rolling wheel between the unit cores, so that troubles such as vertical movement of the body are unlikely to occur. Furthermore, since the continuous core is made of high-hardness plastic with high workability, it can be made into a unit core and band of any shape corresponding to each wheel, etc., or a steel cord etc. is embedded in the band. In addition to being easy to insert, the belt and the unit core are molded in one zone, so that it is easy to manufacture.

[Brief description of the drawings]

FIG. 1 shows a conventional metal core, FIGS. 2A and 2B are a plan view and a cross-sectional view of a state in which the core is embedded in a rubber crawler body, and FIG. FIG. 4 is a perspective view of a continuous core used in the present invention, FIG. 5 is a perspective view of the continuous core embedded in a rubber crawler body, and FIG. , B show another example, FIGS. 7A and 7B are explanatory views of the manufacturing state, A is a front view, and FIG.
Is a side view, FIG. 8 is an explanatory view showing a semi-endless crawler, FIG. 9 shows another example of a continuous core body, FIG. 10 shows a state in which this is embedded in a rubber crawler body,
11A and 11B show still another example, and FIG. 12 shows the above example in which the pitch interval between the unit cores is reduced. A is a perspective view of the continuous core, and B is the continuous core. FIG. 3 is a view showing a state in which a body is embedded in a rubber crawler main body. 4 ... Continuous core, 4 '... Unit core 4'a ... Center engaging part, 4'b ... Corner 4'c ... Wing, 4'd ... Band 4'e ... ... engaging part, 4'f ... shoulder part 5 ... steel cord, 8a, 8b ... upper and lower mold 10 ... cylinder, 15 ... recess

Claims (5)

(57) [Scope of request for utility model registration] 1. A pair of unit cores, each having a pair of corners opposed to each other with a central engaging portion interposed therebetween so as to protrude, and forming a wing portion having a fixed width on the outside of each corner, are arranged at regular intervals. In addition to connecting the adjacent wings with a flat band with a fixed width, the continuous core body between the central engaging parts is an engaging hole into which the sprocket claw is fitted. A flat band formed integrally with the body plastics and connecting each core metal wing part and each wing part in the rubbery material of the crawler body was embedded, and only each corner part protruded. Rubber crawler characterized by the following. 2. The rubber crawler according to claim 1, wherein a concave portion is provided at an intermediate portion of the flat strip connecting adjacent wing portions of the unit core. 3. A flat plate having a shoulder step which is a contact surface of an outer collar wheel at a position above a wing on both outer sides of a corner of a unit core body, and a recess between adjacent shoulder steps. The rubber crawler according to claim 1, wherein the rubber crawler is connected as a band, and is embedded so that the shoulder step portion coincides with the upper surface of the crawler body. 4. The thickness of the flat strip is about half the thickness of the metal core wing, and the width of the flat strip is at least half the length of each blade of the unit core. The rubber crawler according to any one of claims 1, 2 and 3, wherein the rubber crawler is provided. 5. A U-shaped metal piece is embedded in a pair of corners of the unit core so as to straddle the corner and the central engaging portion. Item 5. A rubber track according to any one of Items 1, 2, 3, and 4.