Caterpillar driving device

Abstract

A caterpillar driving device is disclosed. In the present embodiments, wear is prevented and durability is improved by changing the structure and material of a bush provided in the caterpillar driving device, making it possible for the device to be used in various unfavorable conditions.

Description

caterpillar drive mechanism

[0001] The present invention relates to a bush used in a caterpillar, and more particularly, to a caterpillar driving device.

[0002] In general, among construction machines, dozers, which are mainly used for high-load driving work, account for a particularly high proportion of the cost related to maintenance and management of the undercarriage.

[0003] A conventional bulldozer is described with reference to the drawings.

[0004] Referring to the attached drawing 1, a conventional bulldozer (1a) has a caterpillar-type driving device (3) installed on each of the left and right sides of the vehicle body (2), and a blade device (front working device) (4) installed on the front side of the vehicle body (2).

[0005] A ripper device (rear work machine) (5) is installed on the rear side of the vehicle body (2), and the pressure or transport work using the blade device (4) or the crushing and excavation work using the ripper device (5) is performed.

[0006] The above bulldozer (1a) has a track frame (6) that constitutes a skeleton, and the track frame (6) is arranged in front of a sprocket (7) as a driving wheel supported on the rear part of the vehicle body (2) and extends in the front-back direction.

[0007] The above track frame (6) has an idler (8) rotatably mounted as a floating wheel at the front, and a caterpillar (9) as an endless track is mounted in an oval shape between the idler (8) and the sprocket (7).

[0008] The above track frame (6) has an upper front wheel (10) installed on the upper surface side, and the upper front wheel (10) supports the caterpillar (9) moving forward from the sprocket (7) toward the idler (8) from the lower side to prevent sagging and meandering due to its own weight.

[0009] A lower wheel (11) is installed on the lower side of the above track frame (6) as needed, and the lower wheel (11) distributes the weight of the vehicle body and transmits it to the caterpillar (9) while preventing the caterpillar (9) from swaying.

[0010] Referring to the attached drawings 1 and 2, a link structure equipped in a conventional bulldozer is described.

[0011] A conventional bulldozer (1a) is coupled with a bush (14) pressed into the left and right links (12, 13). When the bush (14) is coupled in this manner, the bush (14) also rotates when the left and right links (12, 13) are bent.

[0012] The above bush (14) transmits driving force to the central portion by the rotation of the sprocket (7), and depending on the point of contact with the sprocket (7), the position of the bush (14), terrain, equipment posture, equipment load, tension of the left and right links (12, 13), driving force, etc., a bending motion occurs in a state where a load is applied to the outer diameter of the bush (14).

[0013] In this case, unavoidable sliding contact occurred between the sprocket (7) and the outer diameter of the bush (14). In the case of the conventional bulldozer (1), this phenomenon was continuously repeated throughout the driving, causing the outer diameter of the bush (14) to continuously wear out.

[0014] In addition, since the bush (14) is always fixed to the left and right links (12, 13), wear always occurs only in a certain section, so wear on the outer diameter of the bush (14) as the usage time accumulates occurs only on one side.

[0015] In this case, even if the bush (14) is significantly worn on one exposed side after a certain period of use, the other side does not wear out. The conventional bush (14) is sometimes reused after a bush turning process in which the left and right links (12, 13) are disassembled after a certain period of use, the bush (14) is turned in a direction where no wear has occurred, and then reassembled.

[0016] However, this process also requires cost and time, so it cannot be a fundamental solution. Therefore, a method to fundamentally minimize wear was required.

[0017] Embodiments of the present invention aim to provide a caterpillar driving device capable of changing the material of a bush, simplifying the structure, and extending the lifespan and improving durability.

[0018] According to one embodiment of the present invention, a caterpillar driving device includes a caterpillar rotatably installed by a sprocket on a pair of track frames installed on a vehicle body; an inner bush inserted to a predetermined length on the outside of a pin coupled via a left link and a right link provided on the caterpillar; and a bushing portion having an outer bush provided on the outside of the inner bush so as to be interposed between the left link and the right link and to enable independent rotation.

[0019] The above inner bush and the above outer bush are made of different materials.

[0020] The above outer bushing includes a first outer bushing having an outer diameter and a surface contact with the inner bushing and a composite material used for the inner diameter; and a second outer bushing formed on the outer diameter of the first outer bushing.

[0021] The first outer bushing is characterized in that it is made of any one selected from ultra-high molecular weight polyethylene (UHMWPE), polyamide (PA), polyacetal (POM), polycarbonate (PC), polybutylene terephthalate (PBT), modified polyphenylene oxide (PPO), polyimide, polyamideimide, or polyetheretherketone (PEEK).

[0022] The above ultra-high molecular weight polyethylene (UHMWPE) has a molecular weight of 3.5x10 6 ~10.5 x10 6 It is characterized by (g / mol).

[0023] The above ultra-high molecular weight polyethylene (UHMWPE) contains a reinforcing filler of 0.1 wt% or more and 5 wt% or less.

[0024] The above filler may be carbon particles such as graphite, carbon black, carbon nanotube, nano-diamond, fullerene, graphene, etc.; metal particles such as stainless steel, Al, Cu, Zn, Ni, etc.; fibers such as glass fiber, carbon fiber, aramid fiber, etc.; minerals such as silica, clay, calcium carbonate, talc, etc.; and carbon particles such as graphite, carbon nanotube, etc. are used in a predetermined ratio.

[0025] The second outer bushing is characterized in that it is made of one selected from among heat-treated wear-resistant steel, carburized wear-resistant steel, and high-frequency heat-treated materials.

[0026] The above outer bushing is in surface contact with the entire outer diameter of the above inner bushing and a composite material is used.

[0027]

[0028] According to another embodiment of the present invention, a caterpillar driving device includes: a caterpillar rotatably installed by a sprocket on a pair of track frames installed on a vehicle body; an inner bushing inserted to a predetermined length on the outside of a pin coupled via a left link and a right link provided on the caterpillar; a bushing portion having an outer bushing provided on the outside of the inner bush so as to be interposed between the left link and the right link and to enable independent rotation; a first sealing portion in close contact with both axial sides of the inner bush; and a second sealing portion in close contact with both axial sides of the outer bush.

[0029] The above outer bushing includes a first outer bushing having a bend formed at both axial ends thereof in surface contact with the outer diameter of the inner bushing and having a bend portion bent to a predetermined length toward the second sealing portion; and a second outer bushing formed on the outer diameter of the first outer bushing.

[0030] The above first outer bushing is characterized in that it maintains a state of surface contact with the outer diameter of the inner bushing and the second sealing portion, respectively.

[0031] The first outer bushing above uses a composite material in its inner diameter.

[0032] The above outer bushing is in surface contact with the entire outer diameter of the above inner bushing and a composite material is used.

[0033] These embodiments can increase durability by improving the water surface since the bush can be manufactured from a material with excellent wear resistance, self-lubrication, and corrosion resistance.

[0034] The bushing according to the present embodiment has a combination of self-lubricating, wear-resistant, corrosion-resistant, and anti-stick properties, so that it does not require separate lubrication such as oil or grease, and thus can alleviate joints that may occur in various gaps that are difficult to resolve with the oil contained inside during operation. In addition, the adsorption of foreign substances is prevented, so that the surface is not contaminated, and thus the parts are not contaminated or corroded during storage, and can be assembled more easily and smoothly during assembly.

[0035] The bush according to the present embodiment is fundamentally inactive and, in particular, has a very low moisture content and fundamentally excludes moisture, so it exhibits excellent durability even in wet environmental conditions including salt water, which is the harshest environmental condition.

[0036] The bushing according to this embodiment has excellent impact resistance compared to existing steel series materials, and thus has superior physical properties compared to existing wear-resistant steel materials in an environment exposed to repeated impacts, is elastic compared to wear-resistant steel, and has excellent shock and vibration absorption capabilities, thereby reducing shock and vibration generated during operation.

[0037] This embodiment reduces the weight by reducing the thickness of the bushing while replacing it with an engineering plastic material, thereby reducing the inertia of the caterpillar. The reduced inertia is expected to improve fuel efficiency and ride comfort by reducing noise and vibration caused by self-vibration.

[0038] According to this embodiment, if the bushing is made of an anti-stick material with an outer diameter, soil packing can be fundamentally eliminated, thereby reducing wear on the sprocket.

[0039] Figure 1 is a drawing showing a conventional bulldozer.

[0040] Figure 2 is a cross-sectional view showing a bushing coupled to a conventional left and right link.

[0041] Fig. 3 is a drawing illustrating a caterpillar driving device according to the present embodiment.

[0042] Fig. 4 is a cross-sectional view showing a bushing according to the present embodiment.

[0043] Fig. 5 is a cross-sectional view showing a modified embodiment of Fig. 4.

[0044] Figure 6 is a cross-sectional view showing another embodiment of the present invention.

[0045] Fig. 7 is a cross-sectional view showing a modified embodiment of Fig. 6.

[0046] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined solely by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0047] When one component is referred to as being "connected to" or "coupled to" another component, it includes both cases where it is directly connected or coupled to the other component, or where there is another component intervening therebetween. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that there is no other component intervening therebetween. "And / or" includes each and any combination of one or more of the mentioned items.

[0048] The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular includes the plural unless the context clearly dictates otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements.

[0049] Although terms like "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another.

[0050]

[0051] A caterpillar driving device according to an embodiment of the present invention will be described with reference to the drawings. For reference, FIG. 3 is a drawing illustrating a caterpillar driving device according to the present embodiment, FIG. 4 is a cross-sectional view illustrating a bushing according to the present embodiment, and FIG. 5 is a cross-sectional view illustrating a modified embodiment of FIG. 4.

[0052] Referring to the attached drawings 3 and 4, the caterpillar driving device (1) according to the present embodiment includes a caterpillar (16) (17) rotatably installed on a pair of track frames (12) (13) installed on a body (11) by a sprocket (14) (15), an inner bush (110) inserted to a predetermined length on the outside of a pin (23) coupled via a left link (21) and a right link (22) provided on the caterpillar (16) (17), and a bush part (100) having an outer bush (120) provided on the outside of the inner bush (110) so as to be interposed between the left link (21) and the right link (22) and to enable independent rotation.

[0053] In this embodiment, the outer bush (120) is provided separately from the inner bush (110) to enable independent rotation, so the outer bush (120) is installed in a state where it can rotate freely rather than being installed in a fixed state.

[0054] In this case, the outer bushing (120) does not have a sliding contact movement with the sprocket (14) (15), so deformation due to wear is prevented from occurring on the outer diameter of the outer bushing (120), and thus, even when used for a long period of time, there is no need to change the position or disassemble and reassemble for repair, so that the usability of the caterpillar driving device (1) is always maintained.

[0055] Therefore, durability can be improved by changing the structure of the outer bush (120).

[0056]

[0057] This embodiment can prevent wear of the sprocket (14) (15) together with the aforementioned outer bush (120), thereby improving durability of expensive components and preventing work stoppage due to repair or disassembly and assembly, thereby improving user convenience.

[0058] In particular, the outer bush (120) according to the present embodiment is made of a different material from the inner bush (110), thereby resolving various problems caused by wear.

[0059] For example, the outer bush (120) includes a first outer bush (122) that is in surface contact with the outer diameter of the inner bush (110) and uses a composite material for the inner diameter, and a second outer bush (124) formed on the outer diameter of the first outer bush (122).

[0060] The above first outer bushing (122) is made of a material having self-lubricating properties, wear-resistant properties, corrosion-resistant properties, and anti-stick properties, so that the material has high properties and can prevent deformation caused by wear and chemical reactions.

[0061] For example, the first outer bushing (122) is made of one selected from among ultra-high molecular weight polyethylene (UHMWPE), polyamide (PA), polyacetal (POM), polycarbonate (PC), polybutylene terephthalate (PBT), modified polyphenylene oxide (PPO), polyimide, polyamideimide, and polyetheretherketone (PEEK).

[0062] In particular, ultra-high molecular weight polyethylene (UHMWPE) can maintain wear resistance higher than that of wear-resistant steel in an environment where abrasive wear occurs, and has self-lubricating properties, so even when wetted by surface contact with the inner bush (110), the coefficient of friction is low at 0.2 or less, is chemically stable and does not corrode, and particles of any nature are not adsorbed, so a clean surface is always maintained.

[0063] The first outer bushing (122) is made of ultra-high molecular weight polyethylene having a molecular weight of 3.5x106 g / mol or more and 10.5x10 6 It is desirable that the molecular weight is less than g / mol. The molecular weight is 3.5x10 6 If it is less than g / mol, the wear resistance is not sufficient, and if it is less than 10.5x10 6 Since it is not desirable to exceed g / mol because processability is poor, it is used at the molecular weight mentioned above.

[0064] To improve some of the mechanical properties of ultra-high molecular weight polyethylene, such as load-bearing capacity, rigidity, hardness, and creep resistance, fillers can be added to reinforce the matrix. The fillers added at this time can be carbon particles such as graphite, carbon black, carbon nanotubes, nano-diamonds, fullerene, and graphene; metal particles such as stainless steel, Al, Cu, Zn, and Ni; fibers such as glass fiber, carbon fiber, and aramid fiber; and minerals such as silica, clay, calcium carbonate, and talc. Carbon particles such as graphite and carbon nanotubes are used.

[0065] The appropriate filler content for reinforcing the ultra-high molecular weight polyethylene matrix varies depending on the type and size of the filler, but is preferably 0.1 wt% or more and 5 wt% or less. If the filler content is less than 0.1 wt%, the improvement in physical properties is limited, and if it exceeds 5 wt%, the improvement in physical properties is minimal compared to the amount of filler added, and processability is poor, so it is not desirable, and therefore it is maintained at the aforementioned content.

[0066]

[0067] The appropriate filler particle size for reinforcing the ultra-high molecular weight polyethylene matrix varies depending on the type and size of the filler, but an average particle size of 10 nm or more and 100 μm or less is preferable.

[0068] If the filler content is less than 10 nm, the filler particles tend to clump together to minimize the surface area, making it difficult to mix uniformly within the matrix, which limits the improvement of physical properties. If it exceeds 100 μm, the improvement of physical properties is minimal or may even worsen, which is not desirable.

[0069] It is desirable to form ultra-high molecular weight polyethylene bushings into round or cylindrical shapes by ram extrusion or compression molding, and then perform additional machining only on parts that require special shapes (lip shapes, etc.) or high dimensional precision.

[0070] The desired molecular weight of ultra-high molecular weight polyethylene bushing is 3.5x10 6 g / mol or more than 10.5x10 6 Injection molding is not easy in cases below g / mol because the fluidity is limited due to high viscosity in the molten state, and a molding method capable of applying high pressure of 1000 to 3000 psi is desirable to secure the density of the final molded body structure and improve the physical properties.

[0071] The above outer bushing (120) does not have separate sealing sections installed on both axial ends. For example, even if soil and water penetrate into the inner side of the outer bushing (120), the inner surface has excellent wear resistance, so wear does not occur, and by continuously providing lubrication, corrosion does not occur, thereby preventing the phenomenon of adhesion with the opposite surface of the inner bushing (110).

[0072] In addition, since the outer surface of the inner bush (110) is constantly lubricated and maintained in a separated state, wear does not occur only in a local area at a specific location but evenly over the entire circumference, thereby extending the lifespan compared to the existing design.

[0073]

[0074] The second outer bushing (124) according to the present embodiment uses any one selected from heat-treated wear-resistant steel, carburized wear-resistant steel, or high-frequency heat-treated materials. Since the second outer bushing (124) surrounds the outer side of the first outer bushing (122) and is formed in the shape shown in the drawing, the aforementioned materials are used. For example, a carburized or high-frequency heat-treated material may be used.

[0075]

[0076] Another embodiment of the present invention will be described with reference to the drawings.

[0077] Referring to the attached Fig. 5, in this embodiment, unlike the embodiment of the aforementioned Fig. 4, the outer bush (120) is in surface contact with the entire outer diameter of the inner bush (110) and a composite material is used.

[0078] The above outer bushing (120) is entirely composed of a self-lubricating material. In this case, it can be connected to the outside of the inner bushing (110) with a simple structure. In this case, wear resistance, self-lubrication, corrosion resistance, and anti-stick properties are maintained, so wear of the sprocket (14)(15) and joints during operation can also be reduced.

[0079]

[0080] A caterpillar driving device according to another embodiment of the present invention will be described with reference to the drawings.

[0081] Referring to the attached drawings 6 and 7, the caterpillar driving device comprises a caterpillar (16) (17) rotatably installed by a sprocket (14) (15) on a pair of track frames (12) (13) installed on a body (11), an inner bush (110a) inserted to a predetermined length on the outside of a pin (23) coupled via a left link (21) and a right link (22) provided on the caterpillar (16) (17), and a bushing part (100a) provided with an outer bush (120a) on the outside of the inner bush (110a) so as to be interposed between the left link (21) and the right link (22) so as to be independently rotatable, a first sealing part (30) in close contact with both axial sides of the inner bush (110a) and a second sealing part (30) in close contact with both axial sides of the outer bush (120a). Includes a sealing portion (40).

[0082] The above outer bush (120a) is in surface contact with the outer diameter of the inner bush (110a), and includes a first outer bush (122a) having a bent portion (121a) formed at both axial ends to a predetermined length toward the second sealing portion (40), and a second outer bush (124a) formed on the outer diameter of the first outer bush (122a).

[0083] This embodiment corresponds to an improved embodiment of the outer bush (120) illustrated in the embodiment illustrated in FIG. 5 among the embodiments described above.

[0084] That is, the outer bushing (120a) illustrated in this embodiment has a bent portion (121a) formed therein, and the bent portion (121a) is joined in a state of surface contact with the second sealing portion (40).

[0085] The second sealing portion (40) is coupled with a thrust ring (50) on the outside of the inner bush (110a) to limit a certain level of lateral displacement, and a seal ring (42) is maintained in contact with the outside of the thrust ring (50), and the outer bushing (120a) is coupled in a state of being in contact with the seal ring (52) and the thrust ring (50).

[0086] And a load ring (44) that applies a pressure greater than a certain level with a certain elastic restoring force is attached to the outside of the seal (42).

[0087]

[0088] The above seal ring (42) supports the elastic restoring force of the load ring (44), and has sufficient wear resistance under initial surface and grinding wear conditions to minimize wear of the bending portion (121a) that is in constant contact, and prevents corrosion from progressing even in a wet environment containing salt.

[0089] For this purpose, the sealing (42) may be made of a polymer material such as surface-polished stainless steel, thermoplastic polyurethane (TPU), ultra-high molecular weight polyethylene (UHMWPE), polycarbonate (PC), or a reinforced composite material based thereon.

[0090] In particular, the outer bushing (120a) according to the present embodiment has a bent portion (121a) formed, so that it can be implemented through simple processing, and the material already has wear resistance, self-lubrication, corrosion resistance, and anti-stick properties, so it also exhibits excellent functional properties.

[0091] When the outer bushing (120a) is configured in this way, the structure of the second sealing portion (40) where the relative contact is made is also simplified, so the range of material selection can be expanded and production costs can be reduced.

[0092]

[0093] Since the first outer bushing (122a) is maintained in a state of surface contact with the outer diameter of the inner bushing (110a) and the second sealing portion (40) as shown in the drawing, problems due to wear can be minimized.

[0094] The first outer bushing (122a) uses a composite material in its inner diameter. For example, the first outer bushing (122a) uses a material having self-lubricating properties, wear resistance properties, corrosion resistance properties, and anti-stick properties, thereby achieving high physical properties and preventing deformation due to wear and chemical reactions.

[0095] For example, the first outer bushing (122a) is made of one selected from among ultra-high molecular weight polyethylene (UHMWPE), polyamide (PA), polyacetal (POM), polycarbonate (PC), polybutylene terephthalate (PBT), modified polyphenylene oxide (PPO), polyimide, polyamideimide, and polyetheretherketone (PEEK).

[0096] In particular, ultra-high molecular weight polyethylene (UHMWPE) can maintain wear resistance higher than that of wear-resistant steel in an environment where abrasive wear occurs, and has self-lubricating properties, so even when wetted by surface contact with the inner bush (110), the coefficient of friction is low at 0.2 or less, is chemically stable and does not corrode, and particles of any nature are not adsorbed, so a clean surface is always maintained.

[0097] The first outer bushing (122a) is made of ultra-high molecular weight polyethylene with a molecular weight of 3.5x10 6 g / mol or more than 10.5x10 6 It is desirable that the molecular weight is less than g / mol. The molecular weight is 3.5x10 6 If it is less than g / mol, the wear resistance is not sufficient, and if it is less than 10.5x10 6 Since it is not desirable to exceed g / mol because processability is poor, it is used at the molecular weight mentioned above.

[0098] To improve some of the mechanical properties of ultra-high molecular weight polyethylene, such as load-bearing capacity, rigidity, hardness, and creep resistance, fillers can be added to reinforce the matrix. The fillers added at this time can be carbon particles such as graphite, carbon black, carbon nanotubes, nano-diamonds, fullerene, and graphene; metal particles such as stainless steel, Al, Cu, Zn, and Ni; fibers such as glass fiber, carbon fiber, and aramid fiber; and minerals such as silica, clay, calcium carbonate, and talc. Carbon particles such as graphite and carbon nanotubes are used.

[0099] The appropriate filler content for reinforcing the ultra-high molecular weight polyethylene matrix varies depending on the type and size of the filler, but is preferably 0.1 wt% or more and 5 wt% or less. If the filler content is less than 0.1 wt%, the improvement in physical properties is limited, and if it exceeds 5 wt%, the improvement in physical properties is minimal compared to the amount of filler added, and processability is poor, so it is not desirable, and therefore it is maintained at the aforementioned content.

[0100]

[0101] The appropriate filler particle size for reinforcing the ultra-high molecular weight polyethylene matrix varies depending on the type and size of the filler, but an average particle size of 10 nm to 100 μm is preferred. If the filler content is less than 10 nm, the filler particles tend to clump together and minimize their surface area, making it difficult to mix evenly within the matrix, limiting the improvement in physical properties. In addition, if the filler content exceeds 100 μm, the improvement in physical properties is minimal or may even worsen, making it undesirable.

[0102] It is desirable to form ultra-high molecular weight polyethylene bushings into round or cylindrical shapes by ram extrusion or compression molding, and then perform additional machining only on parts that require special shapes (lip shapes, etc.) or high dimensional precision.

[0103] The desired molecular weight of ultra-high molecular weight polyethylene bushing is 3.5x10 6 g / mol or more than 10.5x10 6 Injection molding is not easy in cases below g / mol because the fluidity is limited due to high viscosity in the molten state, and a molding method capable of applying high pressure of 1000 to 3000 psi is desirable to secure the density of the final molded body structure and improve the physical properties.

[0104] The first outer bushing (122a) is provided with a lip seal (121b) that is maintained in contact with the second sealing portion (40) at both ends with a predetermined area. The lip seal (121b) is maintained in contact with the sealing (42) in the form shown in the enlarged view of the drawing.

[0105]

[0106] Referring to the attached drawing 7, the outer bush (120a) according to the present embodiment is in surface contact with the entire outer diameter of the inner bush (110a) and a composite material is used.

[0107] The outer bushing (120a) is made entirely of self-lubricating material, a thrust ring (50) is coupled to the outside of the inner bushing (110a), and a seal ring (42) is maintained in contact with the outside of the thrust ring (50).

[0108] And a load ring (44) that applies a pressure greater than a certain level with a certain elastic restoring force is attached to the outside of the seal (42).

[0109] The outer bushing (120a) above has a lip seal (120b) formed on both ends that maintains contact with the second sealing portion (40) over a predetermined area. The lip seal (120b) is maintained in contact with the sealing (42) in the form shown in the enlarged view of the drawing.

[0110] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

[0111] This embodiment can be applied to a caterpillar driving device that can be expected to improve fuel efficiency and ride comfort through noise and vibration reduction caused by self-vibration.

Claims

1. A caterpillar rotatably installed by a sprocket on a pair of track frames installed on the vehicle body; An inner bushing inserted to a predetermined length on the outside of a pin coupled via a left link and a right link provided in the caterpillar; and A caterpillar driving device including a bushing section having an outer bushing provided on the outside of the inner bushing so as to be capable of independent rotation, the outer bushing being interposed between the left link and the right link.

2. In paragraph 1, A caterpillar driving device in which the inner bush and the outer bush are made of different materials.

3. In paragraph 1, The above outer bushing is in surface contact with the outer diameter of the above inner bushing, and is a first outer bushing in which a composite material is used for the inner diameter; A caterpillar driving device including a second outer bushing formed on the outer diameter of the first outer bushing.

4. In paragraph 1, A caterpillar driving mechanism, characterized in that the first outer bushing is any one selected from ultra-high molecular weight polyethylene (UHMWPE), polyamide (PA), polyacetal (POM), polycarbonate (PC), polybutylene terephthalate (PBT), modified polyphenylene oxide (PPO), polyimide, polyamideimide, or polyetheretherketone (PEEK).

5. In paragraph 4, The above ultra-high molecular weight polyethylene (UHMWPE) has a molecular weight of 3.5x10 6 ~10.5 x10 6 A caterpillar drive mechanism characterized by having a molecular weight of (g / mol).

6. In paragraph 4, The above ultra-high molecular weight polyethylene (UHMWPE) is a caterpillar driving device containing 0.1 wt% or more and 5 wt% or less of reinforcing filler.

7. In paragraph 6, The above filler may be carbon particles such as graphite, carbon black, carbon nanotube, nano-diamond, fullerene, graphene, etc.; metal particles such as stainless steel, Al, Cu, Zn, Ni, etc.; fibers such as glass fiber, carbon fiber, aramid fiber, etc.; minerals such as slilc, clay, calcium carbonate, talc, etc.; and a caterpillar driving device in which carbon particles such as graphite and carbon nanotube are used in a predetermined ratio.

8. In paragraph 3, A caterpillar driving mechanism, characterized in that the second outer bushing is made of any one selected from heat-treated wear-resistant steel, carburized wear-resistant steel, or high-frequency heat-treated material.

9. In paragraph 1, A caterpillar driving device in which the above outer bushing is in surface contact with the entire outer diameter of the above inner bushing and a composite material is used.

10. A caterpillar rotatably installed by a sprocket on a pair of track frames installed on the vehicle body; A bushing part having an inner bushing inserted to a predetermined length on the outside of a pin coupled via a left link and a right link provided in the caterpillar, and an outer bushing provided on the outside of the inner bushing so as to be interposed between the left link and the right link and capable of independent rotation; A first sealing portion that is in close contact with both axial sides of the inner bushing; and A caterpillar driving device including a second sealing portion that is in close contact with both axial sides of the outer bushing.

11. In clause 10, The above outer bushing is a first outer bushing that is in surface contact with the outer diameter of the inner bushing and has a bent portion formed at both ends in the axial direction toward the second sealing portion to a predetermined length; A caterpillar driving device including a second outer bushing formed on the outer diameter of the first outer bushing.

12. In paragraph 10, A caterpillar driving device in which the first outer bushing is maintained in surface contact with the outer diameter of the inner bushing and the second sealing portion, respectively.

13. In paragraph 12, The above first outer bushing is a caterpillar driving device in which a composite material is used in the inner diameter.

14. In paragraph 13, A caterpillar driving device in which a lip seal is formed on both ends of the first outer bushing, which is in contact with the second sealing portion with a predetermined area.

15. In paragraph 10, A caterpillar driving device in which the above outer bushing is in surface contact with the entire outer diameter of the above inner bushing and a composite material is used.

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