Protective supporting chain wheel and crawler-type engineering machinery

Abstract

The utility model discloses a protective supporting chain wheel and crawler-type engineering machinery, and belongs to the technical field of engineering machinery. Wherein the supporting chain wheel is provided with a wheel body, a wheel shaft rotationally assembled with the wheel body is inserted into an inner cavity of the wheel body, a floating sealing seat and a protective cover are installed on the wheel shaft, the floating sealing seat is matched with a floating sealing piece to seal the inner cavity of the wheel body, the protective cover is located on the outer side of the floating sealing seat, and the floating sealing seat and a floating sealing cavity formed between the floating sealing seat and the wheel body are covered and buckled in the protective cover; the protective cover is provided with a mud discharging hole, and the mud discharging hole is communicated with a gap formed between the protective cover and the wheel body and used for discharging sundries in the gap and preventing the sundries from falling into a floating sealing cavity of the supporting chain wheel, so that the floating sealing piece is protected, and the sealing failure of the floating sealing piece is avoided. And the floating sealing piece is reliably sealed, so that the leakage of lubricating oil in the carrier wheel can be effectively prevented, and the problem of poor lubrication of the carrier wheel caused by oil leakage is solved, thereby prolonging the service life of the carrier wheel and ensuring the reliable operation of the crawler-type engineering machinery.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery and relates to a crawler-type engineering machinery, in particular to a carrier sprocket suitable for crawler-type engineering machinery. Background Art

[0002] Crawler engineering machinery is a type of engineering machinery that uses crawler tracks, primarily including crawler cranes, crawler transporters, and crawler excavators. These machines utilize crawler tracks to move across various terrains, offering excellent maneuverability and adaptability.

[0003] The structural design of crawler engineering machinery mainly includes components such as the frame, power unit, working device, slewing mechanism, control mechanism, transmission system, traveling mechanism and auxiliary equipment. Among them, the traveling mechanism mainly includes components such as crawler tracks, drive wheels, driven wheels, supporting rollers, carrier wheels, suspension systems, etc. Among them, the carrier wheels are installed directly below the upper crawler tracks. By lifting the crawler tracks upwards, the crawler tracks have a certain degree of tension to ensure the normal operation and tension of the crawler tracks. At the same time, the carrier wheels can prevent the crawler tracks from sagging and can reduce the up and down vibration of the crawler tracks during travel, ensuring the stable operation of the crawler tracks. In addition, the carrier wheels can also position the crawler tracks to prevent them from sliding sideways during travel. ‌‌

[0004] Because the carrier sprocket is located directly below the track, dirt and other debris stuck to the track can easily fall onto the carrier sprocket, sometimes even falling into the carrier sprocket's floating seal cavity, causing the floating seal in the carrier sprocket to fail and cause oil leakage. The carrier sprocket after oil leakage will cause premature damage due to poor lubrication, thereby shortening the carrier sprocket's service life. Summary of the Invention

[0005] In response to the above problems existing in the prior art, the utility model proposes a protective sprocket wheel, which can effectively prevent dirt and other debris from falling into the floating seal cavity of the sprocket wheel, thereby protecting the floating seal and achieving reliable sealing of the lubricating oil in the wheel body.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a protective carrier sprocket, comprising:

[0008] a wheel body having a hollow inner cavity;

[0009] A wheel axle, which is inserted into the inner cavity of the wheel body and rotatably assembled with the wheel body;

[0010] A floating seal seat is mounted on the wheel shaft and cooperates with a floating seal to seal the inner cavity of the wheel body;

[0011] A protective cover is mounted on the wheel shaft, is located outside the floating seal seat, and buckles the floating seal seat and the floating seal cavity formed between the floating seal seat and the wheel body;

[0012] A mud discharge hole is provided on the protective cover and is connected to the gap formed between the protective cover and the wheel body, and is used to discharge debris in the gap.

[0013] In some embodiments of the present application, in order to effectively prevent external debris from invading the floating seal cavity, the protective cover can be designed to have a top cover plate and a peripheral ring; an assembly hole can be opened at the center of the top cover plate, and the wheel axle is passed through the assembly hole and fixedly assembled with the top cover plate; the peripheral ring is configured to be located on the inner side of the top cover plate and arranged around the outer circumference of the top cover plate, so that the floating seal seat and the floating seal cavity cover are buckled in the space enclosed by the inner side of the top cover plate and the peripheral ring, preventing external debris from contacting the floating seal seat or entering the floating seal cavity, thereby achieving effective protection for the floating seal. The mud discharge hole can be opened on the peripheral ring to remove debris that falls into the gap between the protective cover and the wheel body, preventing it from entering the floating seal cavity through the gap and causing the floating seal to fail.

[0014] In some embodiments of the present application, the top cover plate can be assembled on the axle using an interference fit to achieve secure installation of the top cover plate on the axle. This fixing method allows the existing carrier sprocket to be directly modified without having to replace the carrier sprocket to achieve the protective function. Therefore, the modification cost is low and the efficiency is high.

[0015] In some embodiments of the present application, the mud drainage holes can be provided in the form of notches on the outer ring of the protective cover, with the notches extending from the side of the outer ring away from the top cover plate toward the top cover plate. In this way, mud and other debris that fall into the gaps will fall out when the wheel rotates to the notches, thereby achieving mud drainage.

[0016] In some embodiments of the present application, the mud drainage holes may also be formed in other ways. For example, the outer ring may be designed as a discontinuous ring, and the mud drainage holes are formed at the disconnected positions to achieve a mud drainage effect.

[0017] In some embodiments of the present application, a plurality of mud drainage holes may be provided, and the mud drainage holes may be arranged adjacent to each other on the outer ring to ensure that the debris in the gap can be completely removed as much as possible.

[0018] In some embodiments of the present application, a circle of groove is formed around the floating seal seat on one end face of the wheel body on which the floating seal seat is installed; the size of the protective cover can be configured so that the outer ring of the protective cover extends into the groove, so that the gap is formed between the outer ring of the protective cover and the groove.

[0019] In some embodiments of the present application, the size of the protective cover can be configured to limit the gap to within 1 mm to reduce the probability of foreign debris falling into the gap.

[0020] In another aspect, the present invention further provides a crawler-type engineering machine, comprising a frame, a crawler track, and a carrier sprocket; the carrier sprocket is mounted on the frame and is located directly below the crawler track that rotates above the frame; wherein the carrier sprocket is a protective carrier sprocket, comprising:

[0021] a wheel body having a hollow inner cavity;

[0022] A wheel axle, which is inserted into the inner cavity of the wheel body and rotatably assembled with the wheel body;

[0023] A floating seal seat is mounted on the wheel shaft and cooperates with a floating seal to seal the inner cavity of the wheel body;

[0024] A protective cover is mounted on the wheel shaft, is located outside the floating seal seat, and buckles the floating seal seat and the floating seal cavity formed between the floating seal seat and the wheel body;

[0025] A mud discharge hole is provided on the protective cover and is connected to the gap formed between the protective cover and the wheel body, and is used to discharge debris in the gap.

[0026] In some embodiments of the present application, the axle of the protective sprocket wheel can be fixedly mounted on the vehicle frame, and the mud discharge hole can be adjusted to the bottom of the axle, so that when the debris in the gap rotates to the bottom of the axle with the wheel body, it can be effectively discharged through the mud discharge hole by the dual effects of its own gravity and rotational centrifugal force.

[0027] Compared with the prior art, the advantages and positive effects of the present invention are mainly reflected in:

[0028] 1. This utility model installs a protective cover on the outside of the carrier sprocket's floating seal seat and provides mud drainage holes in the cover. This effectively prevents dirt and other debris from falling into the carrier sprocket's floating seal cavity, protecting the floating seal and preventing seal failure. The floating seal reliably seals and effectively prevents lubricating oil from leaking from the carrier sprocket, eliminating the problem of poor lubrication of the carrier sprocket due to oil leakage, thereby extending the carrier sprocket's service life.

[0029] 2. The utility model adopts an interference fit method to install the protective cover on the wheel shaft of the carrier sprocket. The other parts on the carrier sprocket do not need to be modified. This method can be achieved by simple modification on the existing carrier sprocket without replacing the carrier sprocket. The modification cost is low and the efficiency is high.

[0030] 3. The utility model applies the modified carrier sprocket to crawler-type engineering machinery, which can effectively prevent the mud adhering to the crawler track from falling into the floating sealing cavity of the carrier sprocket, thereby protecting the carrier sprocket and ensuring the reliable operation of the crawler-type engineering machinery.

[0031] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without inventive work.

[0033] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a crawler-type engineering machinery;

[0034] Figure 2 This is a schematic diagram of the external structure of an embodiment of the protective carrier sprocket proposed by the utility model;

[0035] Figure 3 yes Figure 2 The schematic diagram of the external structure of an embodiment of the protective carrier sprocket with the protective cover removed is shown;

[0036] Figure 4 yes Figure 3 A structural cross-sectional view of an embodiment of a carrier sprocket is shown;

[0037] Figure 5 yes Figure 2 A schematic structural diagram of an embodiment of the protective cover;

[0038] Figure 6 yes Figure 5 A bottom-view perspective view of an embodiment of the protective cover shown;

[0039] Figure 7 yes Figure 2 A structural cross-sectional view of an embodiment of a protective carrier sprocket is shown;

[0040] Figure 8 It will Figure 2 The diagram shown is a schematic diagram of the direction of the mud discharge holes when the protective sprocket is installed on a crawler-type construction machinery.

[0041] In the figure, 100, tracked vehicle; 110, frame; 111, support member; 112, support member; 113, bracket; 120, walking mechanism; 121, driving wheel; 122, driven wheel; 123, supporting wheel; 124, sprocket; 125, track; 130, slewing mechanism; 140, operating mechanism; 150, working device; 200, guarded sprocket; 210, wheel body; 211, inner wheel body; 212, outer wheel body; 213, Ferrule; 214, positioning protrusion; 215, inner cavity; 216, inner end face; 217, outer end face; 218, floating seal cavity; 219, groove; 220, axle; 221, bearing; 222, pressure plate; 223, bolt; 230, floating seal seat; 240, floating seal; 250, end cover; 260, oil plug; 270, protective cover; 271, top cover plate; 272, outer ring; 273, shaft hole; 274, mud discharge hole; 275, gap. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inside", "outside", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or internal connections within components. Those skilled in the art can understand the specific meanings of the above terms in this utility model based on specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics may be combined in any appropriate manner in any one or more embodiments or examples.

[0045] In the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0046] like Figure 1As shown, the crawler-type engineering machinery of this embodiment is a crawler vehicle 100, such as a hydraulic excavator, which mainly includes a frame 110, a traveling mechanism 120, a slewing mechanism 130, an operating mechanism 140, a working device 150 and other components.

[0047] The control mechanism 140 is mounted on the top surface of the vehicle frame 110 via the slewing mechanism 130 and can rotate 360° horizontally relative to the vehicle frame 110. The working device 120 is mounted on the control mechanism 140 and is controlled by the control mechanism 140 to perform operations such as excavation and bulldozing. The traveling mechanism 120 is mounted on the vehicle frame 110 and is used to drive the tracked vehicle 100.

[0048] In this embodiment, the traveling mechanism 120 primarily comprises a driving wheel 121, a driven wheel 122, supporting rollers 123, a carrier sprocket 124, and a track 125. The driving wheel 121 and the driven wheel 122 are located at the left and right ends of the frame 110 and mounted on a pair of support members 111 and 112 located at the left and right ends of the frame 110. The supporting rollers 123 are mounted at the bottom of the frame 110 to support the vehicle's weight and transfer it to the ground. Furthermore, the supporting rollers 123 roll on the track 125, preventing the track 125 from slipping laterally and ensuring it does not fall off during steering or driving. The carrier sprocket 124 is mounted above the frame 110, specifically on the top surface of the frame 110 via a bracket 113. It is used to lift the track 125 upward to maintain a certain degree of tension, ensuring proper operation and tautness of the track 125. The crawler track 125 is wound around the driving wheel 121, the driven wheel 122, the supporting wheel 123, and the supporting sprocket 124 to increase the contact area between the vehicle and the ground, thereby effectively reducing the pressure and ensuring that the crawler vehicle 100 can move smoothly and stably even in work sites with harsh road conditions (such as muddy ground, potholes, etc.).

[0049] When tracked vehicle 100 travels on muddy or potholed roads, debris such as dirt or grass clippings inevitably stick to its tracks 125. When the track, clinging to debris, such as dirt or grass clippings, moves over carrier roller 124, it is likely to fall onto carrier roller 124. Some debris may even enter the floating seal cavity of carrier roller 124, causing the floating seal to fail. Since lubricating oil is sealed in carrier roller 124, failure of the floating seal will cause the lubricating oil to leak. A leaking carrier roller can prematurely damage due to poor lubrication, shortening its service life.

[0050] In order to solve the above problems, this embodiment structurally transforms the carrier wheel 124 and designs a protective carrier wheel that can effectively block external debris and prevent it from falling into the floating seal cavity of the carrier wheel, thereby ensuring that the floating seal remains effective.

[0051] Specifically, combined Figures 2 to 4 As shown, the protective carrier wheel 200 of this embodiment mainly includes components such as a wheel body 210, a wheel axle 220, a floating seal seat 230, a floating seal 240, an end cover 250, an oil plug 260, and a protective cover 270.

[0052] Among them, such as Figure 1 As shown, the wheel body 210 mainly includes an inner wheel body 211, an outer wheel body 212, and a collar member 213. The middle facing end surfaces of the inner wheel body 211 and the outer wheel body 212 are butted together and fitted with the collar member 213. The two sides of the collar member 213 are welded to the outer wheel body 212 and the inner wheel body 211 respectively. The outer circumferential surface of the collar member 213 is convex, forming a centering positioning protrusion 214, which is used to position the track 125 in the width direction to ensure stable operation of the tracked vehicle 100.

[0053] like Figure 4 As shown, the wheel body 210 has a hollow inner cavity 215, and the inner cavity 215 passes through the inner end surface 216 and the outer end surface 217 of the wheel body 210 with the central axis of the wheel body 210 as the axis. The inner end surface 216 and the outer end surface 217 are the opposite ends of the wheel body 210 in the axial direction.

[0054] The axle 220 is inserted into the inner cavity 215 of the wheel body from the inner end surface 216 of the wheel body 210 and is rotatably assembled with the wheel body 210 so that the wheel body 210 can rotate freely relative to the axle 220 .

[0055] In some embodiments, a bearing 221 can be installed in the inner cavity 215 of the wheel body, and the bearing 221 can be installed in the outer wheel body 212 so that the length of the wheel axle 220 inserted into the inner cavity 215 of the wheel body is as long as possible, thereby increasing the torque and improving the stability of the assembly between the wheel body 210 and the wheel axle 220.

[0056] In this embodiment, a bearing 221 with a rotating outer ring and a fixed inner ring can be selected for the rotating assembly between the wheel body 210 and the axle 220. Specifically, a pressure plate 222 can be used to position the bearing 221. Bolts 223 are installed on the pressure plate 222. The end of the rotating shaft 220 inserted into the wheel body cavity 215 is connected by bolts 223 to secure the rotating shaft 220 to the inner ring of the bearing 221. The outer ring of the bearing 221 is fixedly mounted on the outer wheel body 212, allowing the wheel body 210 to rotate freely around the axle 220.

[0057] Of course, a bearing 221 may also be installed in the inner wheel body 211 to further improve the assembly stability between the wheel body 210 and the wheel axle 220 .

[0058] The end cap 250 is mounted on the outer end surface 217 of the wheel body 210 to block the opening of the inner cavity 215 formed on the outer end surface 217. In some embodiments, the end cap 250 can be assembled with the wheel body 210 in an interference fit manner to simplify the installation operation.

[0059] A threaded hole is formed on the end cap 250 and passes through the end cap 250, through which lubricating oil can be added to the inner cavity 215 of the wheel body 210. After the filling is completed, the oil plug 260 can be threadedly connected to the threaded hole on the end cap 250 to block the threaded hole and seal the lubricating oil added to the wheel body 210.

[0060] A portion of the axle 220 is exposed from the wheel body 210 toward the inner end face 216 of the wheel body. The diameter of the opening formed by the wheel body cavity 215 on the inner end face 216 of the wheel body is larger than the diameter of the axle 220. The opening on the inner end face 216 can be sealed by the floating seal seat 230.

[0061] In some embodiments, the floating seal seat 230 can be installed on the wheel shaft 220 by means of an interference fit and inserted into the inner cavity 215 of the wheel body. The floating seal seat 230 and the wheel body 210 are sealed by a floating seal 240 to seal the lubricating oil in the inner cavity 215. The cavity between the floating seal seat 230 and the wheel body 210 is referred to as a floating seal cavity 218.

[0062] In order to prevent dirt and other debris from entering the floating seal cavity 218 through the gap between the floating seal seat 230 and the opening on the inner end face 216 of the wheel body and then contacting the floating seal 240, causing the sealing failure of the floating seal 240 and oil leakage, a protective cover 270 is installed on the outer side of the inner end face 216 of the wheel body in this embodiment. Figure 2 、 Figure 7 As shown, the floating seal seat 230 and the floating seal cavity 218 are covered by a protective cover 270 to prevent external debris from invading the floating seal cavity 218.

[0063] In some embodiments, the protective cover 270 can be designed as a cover, such as Figure 5 As shown, it includes a top cover plate 271 and a peripheral ring 272 , and a mud discharge hole 274 is opened on the peripheral ring 272 .

[0064] In some embodiments, the top cover plate 271 can be designed in a circular shape with a hole in the center to form an axle hole 273 for the axle 220 to pass through and be fixedly assembled with the axle 220. In some embodiments, the top cover plate 271 can be installed on the axle 220 by an interference fit to simplify the assembly operation.

[0065] A peripheral ring 272 is mounted on the inner side of the top cover plate 271 (i.e., the side facing the floating seal seat 230 after the top cover plate 271 is mounted on the axle 220). The peripheral ring 272 is arranged around the outer circumference of the top cover plate 271 on the inner side of the top cover plate 271. The peripheral ring 272 is relatively narrow and extends away from the inner side of the top cover plate 271. This allows the floating seal seat 230 and the floating seal chamber 218 to be locked within the space enclosed by the inner side of the top cover plate 271 and the peripheral ring 272, thereby blocking external debris.

[0066] The mud discharge holes 274 can be formed by opening a notch on the peripheral ring 272. For example, the mud discharge holes 274 can be formed by opening from a side of the peripheral ring 272 away from the top cover plate 271 and opening toward the top cover plate 271.

[0067] Of course, the outer ring 272 can also be designed as a discontinuous ring, such as Figure 6 As shown, the mud discharge hole 274 is formed at the disconnected position.

[0068] The mud discharge hole 274 may be provided with one or more mud discharge holes 274 . When multiple mud discharge holes 274 are provided, it is preferred that the multiple mud discharge holes 274 are opened adjacent to each other on the outer ring 272 .

[0069] In some embodiments, a groove 219 may be formed on the inner end surface 216 of the wheel body 210 around the outer periphery of the floating seal seat 230. Figure 3 The size of the protective cover 270 is configured so that the diameter of the top cover plate 271 is slightly smaller than the diameter of the groove 219 so that the outer ring 272 of the protective cover 270 can extend into the groove 219. Figure 2 As shown, the free rotation of the wheel body 210 relative to the protective cover 270 is not affected. In this way, a gap 275 is formed between the outer ring 272 of the protective cover 270 and the groove 219, as shown in FIG. Figure 7 Limiting the gap 275 to within 1 mm can reduce the probability of foreign matter falling into the gap 275 and improve the protection effect.

[0070] In order to allow the debris falling into the gap 275 to be drained as much as possible through the mud drain holes 274, it is preferred to open a plurality of mud drain holes 274 on the protective cover 270, and after the protective carrier wheel 200 is installed on the frame 110 of the tracked vehicle 100, the mud drain holes 274 are located below the wheel axle 220, such as Figure 8Thus, when debris falling into the gap 219 rotates with the wheel body 210 to below the wheel axle 220, it can fall or be thrown out through the mud discharge hole 274 under the dual action of its own gravity and the centrifugal force of rotation, leaving the carrier sprocket 200 and will not enter the floating seal cavity 218, thereby protecting the floating seal 240 and preventing oil leakage from the carrier sprocket 200.

[0071] Industrial Applicability

[0072] A protective cover 270 is added to the conventional carrier sprocket of the tracked vehicle 100 to transform it into a protective carrier sprocket 200 .

[0073] When the tracked vehicle 100 equipped with the guarded carrier sprocket 200 is moving, the track 125 drives the wheel body 210 of the guarded carrier sprocket 200 to rotate around the wheel axle 220 .

[0074] When dirt and other debris stuck to the track 125 is transported to the top of the guarded carrier roller 200 as the track 125 rotates, the debris that falls from the track 125 will fall onto the wheel body 210 of the guarded carrier roller 200. The protective cover 270 installed on the carrier roller can block most of the debris, keeping the floating seal seat 230 and the floating seal cavity 218 clean. However, a small amount of debris will inevitably fall into the gap 275 formed between the protective cover 270 and the wheel body 210.

[0075] Debris that falls into the gap 275 rotates with the wheel body 210. When the wheel body 210 rotates to the position of the mud discharge hole 274 provided in the protective cover 270, the mud discharge hole 274 is connected to the gap 275. Therefore, the debris can be discharged from the mud discharge hole 274 under the action of its own gravity and the centrifugal force of rotation, preventing it from entering the floating seal cavity 218 and damaging the floating seal 240. This prevents the problem of lubricating oil leakage in the wheel body 210 due to sealing failure of the floating seal 240. The lubricating oil in the wheel body 210 is reliably sealed, which can ensure that the carrier sprocket 200 will not suffer premature damage due to poor lubrication, while ensuring the service life of the carrier sprocket and facilitating the reliable operation of the tracked vehicle 100.

[0076] Of course, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A protective carrier sprocket, comprising: a wheel body having a hollow inner cavity; A wheel axle, which is inserted into the inner cavity of the wheel body and rotatably assembled with the wheel body; A floating seal seat is mounted on the wheel shaft and cooperates with a floating seal to seal the inner cavity of the wheel body; It is characterized by further comprising: A protective cover is mounted on the wheel shaft, located outside the floating seal seat, and covers the floating seal seat and the floating seal cavity formed between the floating seal seat and the wheel body; A mud discharge hole is provided on the protective cover and is connected to the gap formed between the protective cover and the wheel body, and is used to discharge debris in the gap.

2. The protective carrier sprocket according to claim 1, characterized in that: The protective cover comprises: A top cover plate, the center of which is provided with an assembly hole, through which the wheel axle passes and is fixedly assembled with the top cover plate; The peripheral ring is located on the inner side of the top cover plate and is arranged around the outer circumference of the top cover plate. The mud discharge holes are opened on the peripheral ring.

3. The protective carrier sprocket according to claim 2, characterized in that: The top cover plate is assembled on the wheel axle in an interference fit manner.

4. The protective carrier sprocket according to claim 2, characterized in that: The mud discharge hole is provided on the outer ring in the form of a notch. The notch is provided on a side of the outer ring away from the top cover plate and extends toward the top cover plate.

5. The protective carrier sprocket according to claim 2, characterized in that: The outer ring is a discontinuous ring, and the mud discharge hole is formed at the disconnected position.

6. The protective carrier sprocket according to any one of claims 2 to 5, characterized in that: The mud discharge holes include a plurality of holes, which are adjacently arranged on the outer ring.

7. The protective carrier sprocket according to any one of claims 2 to 5, characterized in that: On one end surface of the wheel body where the floating seal seat is mounted, a circle of grooves is formed around the floating seal seat; The peripheral ring of the protective cover extends into the groove; The gap is formed between the peripheral ring of the shield and the groove.

8. The protective carrier sprocket according to claim 7, characterized in that: The gap is within 1 mm.

9. A crawler-type engineering machine, comprising a frame, crawler tracks and carrier wheels; the carrier wheels are mounted on the frame and are located directly below the crawler tracks that rotate above the frame; characterized in that: The carrier sprocket is a protective carrier sprocket according to any one of claims 1 to 8.

10. The crawler-type engineering machine according to claim 9, characterized in that: The wheel axle of the protective sprocket is fixedly mounted on the vehicle frame, and the mud discharge hole is located below the wheel axle.

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