KR100997814B1 - Manufacturing method for hybride track pin - Google Patents

Abstract

The present invention relates to a method of manufacturing a track pin that constitutes a track link assembly of a crawler vehicle. The composite track pin manufacturing method according to the present invention is a composite track pin manufacturing method of combining a composite tube made of a fiber-reinforced composite material and a steel tube on the outside of the composite tube, the maximum diameter of the steel tube After making the minimum allowable dimension of the outer diameter of the composite tube larger than the allowable dimension so that the fastening occurs between the inner diameter of the steel tube and the outer diameter of the composite tube, the steel tube is thermally expanded to insert the composite tube. Next, by cooling to room temperature to compress the composite tube by the contraction of the steel tube is made to bond, the composite tube and the steel tube by the forced fit of the shaft-hole coupling method by shrinkage of the steel tube It characterized in that the force is applied to press the composite tube.

Composite, Orbit, Fin, Shrink, Heat, Forced, Fitting, Fiber Reinforced, Composite

Description

MANUFACTURING METHOD FOR HYBRIDE TRACK PIN}

The present invention relates to a track pin constituting a track link assembly of a caterpillar vehicle, and more particularly to a method for manufacturing a composite track pin consisting of assembled tubes of release material.

The track link assembly of a caterpillar vehicle is formed by connecting small-sized shoes with track pins so that the sprockets installed at the front and rear of the vehicle are wound and rotated by driving the sprockets to spur the ground. To move the vehicle.

The track pin of such a track link assembly needs to have sufficient rigidity because it receives the vehicle load and propulsion force, track tension and torsion as it is running or turning, and should be light in weight to help secure the maneuverability of the vehicle.

Among the types of track pins proposed for stiffness and weight reduction, so-called 'composite track pins' (or 'hybrid track pins') are well known.

The composite track pin, as one example disclosed in the Republic of Korea Patent Publication No. 10-0567185, the outside of the track pin consists of a steel tube, the inside of the carbon fiber reinforced composite material or glass fiber reinforced composite Material tubes (hereinafter, referred to as 'fiber-reinforced composite materials') may be used or two tubes may be used together.

As shown in FIG. 8, the composite track pin 340 disclosed in the publication includes an inner composite tube 341 and an outer composite tube 342 made of a fiber-reinforced composite material, and the outer composite tube 342. Steel tubes 343 and 344 coupled to the outside of the end caps 345 and 346.

However, the conventional composite track pin 340, by inserting the steel tube (343) 344 on both sides to the outer composite tube 342, and then to the opposite end face of the two steel tube (342, 344) adhesive Because of the simply joined form, there is a fear that the bonded state is easily broken. In addition, when the joint is broken, the steel tubes 342 and 344 on both sides are separated, so that the breakdown proceeds rapidly with time.

In addition, in the conventional composite track pin, the steel tubes 343 and 344 are joined together, but the steel tubes 343 and 344 and the composite tube 342 are simply fitted together without being joined together. There is room for clearance between the tubes 343 and 344 and the composite tube 342. When the composite tube 342 does not properly support the steel tubes 343 and 344 due to such a gap, the load is concentrated on the steel tubes 343 and 344 so that the steel tubes 343 and 344 are short-lived. Fatigue is broken and furthermore the joint between the steel tubes 343 and 344 on both sides is more easily broken.

In addition, since the conventional composite track pin couples the end caps 345 and 346 to the ends of the steel tubes 343 and 344 by force fitting, the end caps 345 and 346 are connected to the steel tube 343. , 344 may be exerted to increase the gap between the composite tube 342 and the steel tube (343, 344).

The present invention has been invented to solve the conventional problems as described above, the steel tube and composite tube is strongly and firmly bonded without using a separate adhesive means such as adhesive or welding, in the case of a separate steel tube It is an object of the present invention to provide a method of manufacturing a composite track pin that does not require joining between tubes and can simplify the assembly process.

In order to achieve the above object, the composite track pin manufacturing method according to the first embodiment of the present invention, the composite tube made of fiber-reinforced composite material, and the outer side of the composite tube in the shaft-hole coupling method A method of manufacturing a composite track pin comprising a steel tube, wherein the minimum allowable dimension of the outer diameter of the composite tube is greater than the maximum allowable dimension of the inner diameter of the steel tube, thereby fastening between the inner diameter of the steel tube and the outer diameter of the composite tube. After the production to generate, the steel tube is heat-expanded to insert the composite tube, and then cooled to room temperature to compress the composite tube by shrinkage of the steel tube is characterized in that the coupling is made.

In the present invention described above, after the composite material and the steel tube are joined, end caps may be inserted into both end portions of the steel tube in the axial direction.

The composite track pin manufacturing method according to the second embodiment of the present invention is a composite comprising a composite tube made of a fiber-reinforced composite material and a steel tube coupled to the outer side of the composite tube in an axial-hole coupling manner. A method for manufacturing a raceway pin, wherein the end cap is abutted at both ends of the composite tube in the axial direction, and the minimum allowable dimension of the outer diameter of the composite tube and the end cap is greater than the maximum allowable dimension of the inner diameter of the steel tube. After manufacturing to produce a fastening between the inner diameter of the tube and the outer diameter of the composite tube and the end cap, the steel tube is thermally expanded to insert the composite tube and the end cap, and then cooled to room temperature to shrink the steel tube. By pressing the composite tube and the end cap by characterized in that the coupling is completed.

In the above-described composite track pin manufacturing method of the present invention, the composite tube is an inner composite tube made of any one kind of fiber-reinforced composite material and a fiber reinforced composite material of a different kind from the inner composite tube. It consists of consisting of an outer composite tube fitted to the outside of the inner composite tube.

According to the composite track pin manufacturing method of the present invention, by combining the steel tube and the composite tube by shrinking, the steel tube and the composite tube are strongly integrally coupled. Therefore, the steel tube and the composite tube can correspond to a single body with sufficient rigidity with respect to the load, there is no room for a gap between the steel tube and the composite tube can prevent fatigue fracture and improve durability.

In addition, the steel tube and the composite tube do not need to be joined using separate bonding means or joining means, thereby simplifying the assembly process.

In addition, even when using two or more divided steel tubes, the steel tubes do not need to be joined separately, so that any type of track pin can be easily manufactured.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Example 1)

1 to 3 are views showing the composite track pin 10a and its manufacturing method according to the first embodiment of the present invention.

First, Figure 1 is a cross-sectional view showing a composite track pin according to the first embodiment of the present invention.

As shown in Figure 1, the composite track pin 10a according to the first embodiment of the present invention, the composite tube 101 made of fiber-reinforced composite material and the outer side of the composite tube 101 A steel tube 201 that is shrink fit (or sometimes referred to as a 'heat fit') in an axial-hole coupling manner, and may further include an end cap 250 coupled to both axial sides of the steel tube 201. have.

The composite tube 101, the inner composite tube 110 and the outer composite tube 120 may be in the form of a combination as in this embodiment, or the second embodiment described later (see Figure 5) It may be made of a single member as shown.

When the fiber-reinforced composite tube 101 is configured as in this embodiment, the inner composite material tube 110 and the outer composite material tube 120 is preferably made of a heterogeneous material. For example, the inner composite tube 110 is composed of glass fiber reinforced composite material, the outer composite tube 120 is composed of carbon fiber reinforced phenolic resin composite material or carbon fiber reinforced epoxy composite material. The inner composite tube 110 and the outer composite tube 120 may be bonded to each other by an adhesive.

In the present invention, the steel tube 201 is forcibly coupled to the outer side of the fiber-reinforced composite tube 101 by shrinkage. When the steel tube 201 is coupled to the composite tube 101 by shrinking, the steel tube 201 and the composite tube 101 become very firmly bonded, so that the steel tube 201 is first and second. Even if the structure is divided into steel tubes 201a and 201b, the divided steel tubes 201 do not need to be joined together. In addition, since there is no room for clearance between the steel tube 201 and the composite tube 101, the steel tube 201 and the composite tube 101 have functions such as a load capacity originally imparted to each other. Can be sufficiently exerted and functionally harmonized with each other to significantly improve fatigue resistance and durability.

In addition, since the force that presses the composite tube 101 to the steel tube 201 by an interference fit by shrink fit in advance is improved fatigue resistance characteristics in the process actually used in the vehicle.

2 and 3 are views for explaining the manufacturing process of the composite track pin (10a) according to the first embodiment of the present invention.

First, as shown in FIG. 2, the composite tube 101 is integrated by bonding the inner composite tube 110 and the outer composite tube 120 with an adhesive or integrally molded in advance in the forming step. To prepare.

For shrinkage, a fastening is generated between the inner diameter D of the steel tube 201 and the outer diameter d1 of the composite tube 101.

Here, the fastening means that the minimum allowable dimension of the outer diameter d1 of the composite tube 101 is set larger than the maximum allowable dimension of the inner diameter D of the steel tube 201.

For example, when the basic dimension of the outer diameter (D) of the steel tube 201 and the basic dimension of the outer diameter (d1) of the composite tube 101 is 16 mm, the tolerance of the dimensions of the steel tube 201 is determined according to the Korean Industrial Standard. H7 specified in the IT basic tolerance (i.e., the upper dimension tolerance is + 0.018mm and the lower dimension tolerance is set to 0 (zero)) and processed, and the dimension tolerance of the outer diameter d1 of the composite tube 101 is adjusted. When processing with r6 (i.e., upper dimension tolerance +0.034, lower dimension tolerance +0.023), the maximum allowable dimension of the inner diameter D of the steel tube 201 is 16.018 mm, and the composite tube 101 The minimum allowable dimension of the outer diameter (d1) is 16.023mm, a clamp of at least 0.005mm (max 0.034mm) is generated between the steel tube 201 and the composite tube 101.

Accordingly, when the steel tube 201 is heated and thermally expanded to expand the inner diameter D, and then fitted to the composite tube 101 and cooled, the expanded steel tube 201 is contracted by a previously applied fastener. While pressing the composite tube 101 is firmly gripped. At this time, even if the divided first and second steel tubes 201a and 201b are not bonded to each other, the respective steel tubes 201a and 201b are firmly coupled by the gripping force on the composite tube 101. Therefore, there is no worry that the assembled state is released or out of the assembled position.

After the coupling of the steel tube 201 and the composite tube 101 as described above, the end cap 250 is coupled to the steel tube 201 as shown in FIG.

In FIG. 3, the coupling of the end cap 250 to the steel tube 201 provides a clamp between the outer diameter d2 of the end cap 250 and the inner diameter D of the steel tube 201 to end cap 250. ) Is inserted into the end of the steel tube 201 by a hydraulic press or pneumatic press (press fit) method, or by applying an adhesive to the outer diameter of the end cap 250 and inserted into the steel tube (201). Can be implemented. Alternatively, as will be described later with reference to FIG. 6, the end cap 250 may be bonded to the composite tube in advance, and then the composite tube and the end cap may be shrinked together with the steel tube.

Meanwhile, although the shape of the track pin having the end cap 250 has been described in the present embodiment, the end cap 250 is not necessarily required. In other words, the length of the composite tube 101 and the length of the steel tube 201 may be the same, and may be configured to shrink each other.

(Example 2)

4 shows a composite track pin according to a second embodiment of the present invention.

In FIG. 4, the composite track pin 10b according to the second embodiment of the present invention shows that the composite tube 102 can be made in one piece. Also, only this point is different from the first embodiment. That is, instead of dividing the composite tube into the inner composite tube and the outer composite tube as in the first embodiment, a single composite tube 102 is applied.

The combination of the monolithic composite tube 102 and the steel tube 202 is coupled in the interference fit method by shrinkage similarly to the first embodiment. The interference fit method by shrinkage is the same as the method described in the first embodiment.

On the other hand, in the present embodiment is shown in the form without the end cap, the end cap may be combined in the same manner as described in Figures 1 to 3 of the first embodiment.

(Example 3)

5 to 7 show a composite track pin according to a third embodiment of the present invention.

5 is a view showing the assembled state of the composite track pin according to the present embodiment, the composite track pin 10c according to the present embodiment, the composite tube 103 of a single body is coupled to the steel tube (203) The end cap 250 is coupled to the end of the steel tube 103. Here, the composite tube 103, as already described in the previous embodiments, may be composed of the inner composite tube and the outer composite tube.

As shown in FIG. 6, the composite track pin 10c according to the present embodiment has an end portion at an end portion of the composite tube 103 prior to joining the composite tube 103 and the steel tube 203. First, the cap 250 is integrally coupled, and then the composite tube 103 and the end cap 250 which are integrated with respect to the steel tube 203 are shrinked.

First, an adhesive is applied to the opposite surface of the end cap 250 and the composite tube 103 to be bonded. At this time, the outer diameter of the composite tube 103 and the outer diameter of the end cap 250 to have the same dimensions and the same tolerance. To this end, prior to meandering the finishing process, the composite tube 103 and the end cap 250 are contacted with each other in advance, and then the outer diameters of the integrated composite tube 103 and the end cap 250 are adjusted to fit the shrinkage. It is preferable to finish-polish precisely so that the outer diameter may be matched.

The steel tube 203 also has dimensions suitable for shrinkage similarly to the first and second embodiments.

Subsequently, similarly to the first and second embodiments, the steel tube 203 is thermally expanded, and then fitted into the integrated composite tube 103 and the end cap 250 and cooled.

Such an embodiment has the advantage of simplifying the assembly process, especially when there is an end cap 250.

In addition, there is no room for deformation of the steel tube 203 as compared with press-fitting the end cap 250 in a post-process, and there is no fear that the end cap 250 may be distorted and inserted in the pressing process.

Meanwhile, as illustrated in FIG. 7 (see FIG. 6 together), the composite tube 103 and the steel tube 203 are shrunk, and then the end cap 250 and the composite tube 103 face each other. An adhesive may also be applied and joined. That is, the end cap 250 is not bonded to the steel tube 203 but to the composite tube 103.

In the above, specific embodiments of the present invention shown in the accompanying drawings have been described in detail, but these are merely illustrative of the preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. In addition, the embodiments of the present invention as described above can be variously modified and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and equivalent other embodiments are naturally It belongs to the appended claims of the present invention.

1 is a cross-sectional view showing a hybrid track pin according to a first embodiment of the present invention.

2 and 3 are views for explaining the manufacturing process of the composite track pin according to the first embodiment of the present invention.

4 is a view showing a composite track pin according to a second embodiment of the present invention.

5 is a cross-sectional view showing a hybrid track pin according to a third embodiment of the present invention.

6 and 7 are views for explaining the manufacturing process of the composite track pin according to the third embodiment of the present invention.

8 is a cross-sectional view showing the shape of a conventional hybrid track pin.

<Explanation of symbols for the main parts of the drawings>

10a, 10b, 10c: compound track pin

101, 102, 103: Composite tube

110: inner composite tube

120: outer composite tube

201, 202, 203: Steel Tube

201a: first steel tube

201b: second steel tube

250: end cap

Claims (4)

As a composite track pin manufacturing method of combining a composite tube made of a fiber-reinforced composite material and a steel tube on the outside of the composite tube, After making the minimum allowable dimension of the outer diameter of the composite tube larger than the maximum allowable dimension of the inner diameter of the steel tube to produce a fastening between the inner diameter of the steel tube and the outer diameter of the composite tube, by heating and expanding the steel tube Insert the composite tube, and then cooled to room temperature to compress the composite tube by the contraction of the steel tube so that the coupling is made, the composite tube and the steel tube by the shrinkage of the axis-hole coupling method The composite track pin manufacturing method characterized in that the steel tube is given a force to press the composite tube by the intellectual fit. The method of claim 1, After combining the composite material and the steel tube, the composite track pin manufacturing method characterized in that the end cap is inserted into both ends of the axial direction of the steel tube by coupling. As a composite track pin manufacturing method of combining a composite tube made of a fiber-reinforced composite material and a steel tube on the outside of the composite tube, End caps are fitted to both ends of the composite tube in the axial direction, and the minimum allowable dimensions of the outer diameters of the composite tube and the end cap are larger than the maximum allowable dimensions of the inner diameters of the steel tubes, thereby increasing the inner and composite tubes of the steel tubes. And after manufacturing so that the fastening occurs between the outer diameter of the end cap, the expansion of the steel tube by inserting the composite tube and the end cap, and then cooled to room temperature by the shrinkage of the steel tube composite tube and end cap By pressurizing the joints, the composite tube and the end cap are joined by the force-fitting of the shaft-hole coupling method by shrinking with respect to the steel tube, so that the steel tube is connected to the composite tube and the end cap. Composite track pin manufacturing method characterized in that the pressing force is applied. The method according to claim 1 or 3, The composite tube is a composite track pin manufacturing method characterized in that the inner composite tube and the outer composite tube consisting of different types of fiber-reinforced composite material is configured to combine.

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