Thrust wheel and crawler-type engineering machinery

Abstract

The utility model discloses a thrust wheel and crawler-type engineering machinery, and belongs to the technical field of engineering machinery. Wherein the thrust wheel is provided with a wheel body, a shaft sleeve is in interference connection with the interior of an inner cavity of the wheel body, a wheel shaft is installed in the shaft sleeve, an end cover is installed on the wheel shaft, an inner surrounding ring and an outer surrounding ring are arranged on the end cover, the inner surrounding ring is inserted into an opening formed in the end face of the wheel body, of the inner cavity, and the outer surrounding ring is inserted into a groove formed in the end face of the wheel body; a floating sealing assembly is installed between the end cover and the shaft sleeve, and the floating sealing assembly is matched with the end cover to seal an inner cavity of the wheel body. The wheel body and the shaft sleeve are connected in the interference fit mode, bolts are omitted, and the machining process and the assembling operation are simplified. According to the thrust wheel, the floating sealing cavity in the wheel body is designed to be communicated with the outside through the multi-fold roundabout path, so that outside sundries are difficult to intrude into the floating sealing cavity, then the floating sealing assembly is protected, and the problems that the service life of the thrust wheel is affected due to oil leakage caused by failure of the floating sealing assembly are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and relates to a tracked engineering machinery, specifically, a support roller suitable for tracked engineering machinery. Background Technology

[0002] Tracked construction machinery is a type of construction machinery that uses tracks for movement. It mainly includes tracked cranes, tracked transport vehicles, tracked excavators, and tracked bulldozers. These construction machines move across various terrains via their tracked walking mechanisms, exhibiting good maneuverability and adaptability.

[0003] Tracked construction machinery mainly comprises a frame, power unit, working device, slewing mechanism, control mechanism, transmission system, running gear, and auxiliary equipment. The running gear primarily involves key components such as tracks, drive wheels, driven wheels, track rollers, carrier rollers, and the suspension system. The track rollers are mounted on the bottom of the frame and roll on the track chain in contact with the ground. They bear the weight of the entire machine, transferring it to the ground and preventing lateral slippage of the track chain, ensuring it doesn't come off during turning or travel. For tracked bulldozers, the operating environment and conditions for track rollers are more severe, thus requiring higher durability.

[0004] Because the support roller rotates during use, lubricating oil needs to be added inside the support roller to lubricate the internal components and extend its service life. To seal the lubricating oil inside the support roller, a floating seal assembly 10 is usually installed inside the support roller, such as... Figure 2 As shown. The floating seal assembly 10 is typically assembled from two floating seal rings 11 and 12 and two O-rings 21 and 22. During operation, the inner floating seal ring 11 and O-ring 21 rotate with the wheel body 1, as shown. Figure 3 As shown, the floating seal ring 12 and O-ring 22 located on the outer side remain stationary with the end cap 2, and the oil film formed between the contact surfaces of the two floating seal rings 11 and 12 plays a sealing role.

[0005] When installing the floating seal assembly 10, the inner floating seal ring 11 and O-ring 21 are typically installed on the bushing 3 inside the wheel body 1, and the bushing 3 is fixed to the wheel body 1 by bolts 4. The outer floating seal ring 12 and O-ring 22 are installed on the end cap 2, and the end cap 2 is configured to completely enclose the bushing 3 and bolts 4. The end cap 2 is used to seal the inner cavity of the wheel body 1 to prevent external debris such as mud and grass from entering the floating seal cavity 7, which could cause the floating seal assembly 10 to fail and result in oil leakage.

[0006] The main problem with this structural design is that the use of bolts 4 to connect the wheel body 1 and the bushing 3 increases the complexity of the machining process and assembly operation of the wheel body 1 and the bushing 3; a portion of the outer edge of the end cap 2 extends into the groove 5 formed on the end face of the wheel body 1, such as... Figure 3 As shown, another part protrudes from the end face of the wheel body 1. When external debris falls onto the support roller from above, it will accumulate on the part of the end cap 2 that protrudes from the end face of the wheel body 1. Since a gap 6 is inevitably left between the outer edge of the end cap 2 and the outer wall of the groove 5 of the wheel body, the debris accumulated on the end cap 2 is very likely to enter the floating sealing cavity 7 through the gap 7, causing an oil leakage accident. The support roller that leaks oil will be damaged prematurely due to poor lubrication, thereby shortening the service life of the support roller.

[0007] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0008] This utility model addresses the aforementioned problems in the prior art by proposing a support roller that simplifies the processing and assembly of the roller body and bushing while effectively preventing external debris from falling into the floating sealing cavity of the support roller, thereby protecting the floating sealing assembly and achieving reliable sealing of the lubricating oil inside the roller body.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] In one aspect, this utility model proposes a support roller, comprising:

[0011] The wheel body has two end faces that are opposite each other in the axial direction and an inner cavity that axially penetrates the end faces. The inner cavity forms an opening on the end face, and a groove is formed around the opening on the end face.

[0012] A bushing, located in the inner cavity, includes an outer ring and an inner ring that can rotate relative to each other, the outer ring being interference-fitted with the wheel body;

[0013] A wheel axle, which is fixedly assembled with the inner ring of the bushing;

[0014] An end cap has a cover plate with a shaft hole, through which the axle passes and is fixedly assembled with the cover plate; an inner ring and an outer ring extending away from the cover plate are provided on the inner side of the cover plate, the inner ring being inserted into an opening formed in the inner cavity on the end face of the wheel body, and the outer ring being inserted into a groove formed in the end face of the wheel body;

[0015] A floating sealing assembly is installed between the end cap and the bushing, and works with the end cap to seal the inner cavity of the wheel body.

[0016] In some embodiments of this application, the outer ring of the end cap can be configured to surround the outer circumference of the cover plate and slope outwards away from the cover plate; simultaneously, the outer wall of the groove away from the opening is designed as an inclined surface, and the inclined surface is configured to extend outwards from the bottom of the groove towards the end face of the wheel. Thus, when external debris falls into the gap formed by the outer ring and the outer wall of the groove, or further intrudes into the space formed by the inner wall of the groove through the gap, as long as the debris follows the wheel's rotation to below the axle, it can automatically slide down the inclined surface formed by the outer ring to the outer wall of the groove under its own weight, and then slide off the wheel along the inclined outer wall. This structural design can further reduce the probability of external debris intruding into the floating sealing cavity and causing the floating sealing assembly to fail.

[0017] In some embodiments of this application, the groove divides the end face of the wheel into an inner ring surface and an outer ring surface. The outer edge of the end cap can be configured to be recessed relative to the outer ring surface of the end face of the wheel to reduce the probability of external debris falling into the gap formed by the outer ring of the end cap and the outer wall of the groove.

[0018] In some embodiments of this application, the outer side of the end cap can be designed as a stepped surface that is high in the middle and low on the outer periphery, with the middle stepped surface transitioning to the outer stepped surface by an arc; the outer stepped surface can be configured to be recessed relative to the outer ring surface of the wheel body end face, while the inner stepped surface is convex relative to the outer ring surface of the wheel body end face, so as to block external debris as much as possible and keep external debris away from the wheel body.

[0019] In some embodiments of this application, a central retaining ring extending away from the cover plate is provided on the inner side of the end cap. The central retaining ring is arranged around the circumference of the shaft hole and is concentric with the shaft hole and has the same radius. The axle is interference-fitted with the central retaining ring to simplify the assembly operation between the axle and the end cap. At the same time, by providing the central retaining ring, the area of ​​the connection surface between the end cap and the axle is increased, thereby improving the stability of the assembly between the axle and the end cap.

[0020] In some embodiments of this application, to ensure reliable assembly of the floating seal assembly within the wheel body cavity and effective sealing of the lubricating oil within the cavity, a raised ring can be formed on the end face of the bushing opposite the end cover. This raised ring is positioned around the outer edge of the end face of the bushing, facing and spaced from the inner ring of the end cover, with the spaced area forming a floating seal cavity. Two floating seal rings can be provided in the floating seal assembly, and these two floating seal rings can be stacked along the axial direction of the wheel body to form an inner floating seal ring and an outer floating seal ring. A sealing groove is formed around the outer periphery of each floating seal ring, and an O-ring is installed in each sealing groove. The O-ring installed in the inner floating seal ring abuts against the boss of the bushing, and the O-ring installed in the outer floating seal ring abuts against the inner ring of the end cover. In this way, the inner floating seal ring and its O-ring can rotate with the wheel body, while the outer floating seal ring and its O-ring can remain stationary with the end cover. The oil film formed between the contact surfaces of the two floating seal rings can play a sealing role, realizing the floating seal function.

[0021] In some embodiments of this application, in order to improve the reliability of the bushing assembly in the inner cavity of the wheel body, a limiting groove can be opened on the peripheral wall of the inner cavity of the wheel body, and a stop member can be installed in the limiting groove. The stop member is configured to be located in the floating sealing cavity and abut against the boss of the bushing, thereby restricting the installation position of the bushing in the inner cavity of the wheel body and improving the stability of the interference fit between the bushing and the wheel body.

[0022] In some embodiments of this application, the stop member may be a snap ring or a retaining ring.

[0023] In some embodiments of this application, if the axle passes through the inner cavity and extends out of the wheel body at both ends, a set of end caps, floating sealing components, limiting grooves, and stoppers can be respectively provided at opposite ends of the wheel body along the axial direction to achieve end sealing of the lubricating oil in the inner cavity of the wheel body. An assembly hole or positioning hole can be provided at one end of the axle exposed on the wheel body for mounting or positioning the axle on the frame; an oil injection hole can be provided at the other end of the axle exposed on the wheel body for injecting lubricating oil into the inner cavity of the wheel body, and an oil plug can be installed in the oil injection hole to seal it.

[0024] In another aspect, this utility model also proposes a tracked engineering machine, including a frame, tracks, and track rollers; the track rollers roll on the tracks in contact with the ground to transfer the weight of the entire machine to the ground, and include a wheel body, bushing, axle, end cap, and floating seal assembly; wherein, the wheel body has two end faces opposite each other in the axial direction and an inner cavity axially penetrating the end faces, the inner cavity forming an opening on the end face, and a groove forming around the opening on the end face; the bushing is located in the inner cavity and includes an outer ring and an inner ring that can rotate relative to each other, the outer ring being connected to the wheel body. The wheel axle is fixedly assembled with the inner ring of the bushing and installed at the bottom of the frame. The end cover has a cover plate with a shaft hole, through which the wheel axle passes and is fixedly assembled with the cover plate. An inner ring and an outer ring extending away from the cover plate are provided on the inner side of the cover plate. The inner ring is inserted into the opening formed on the end face of the wheel body in the inner cavity, and the outer ring is inserted into the groove formed on the end face of the wheel body. The floating sealing assembly is installed between the end cover and the bushing, and cooperates with the end cover to seal the inner cavity of the wheel body.

[0025] Compared with the prior art, the advantages and positive effects of this utility model are mainly reflected in:

[0026] 1. The support roller of this utility model adopts an interference fit to install the bushing in the inner cavity of the roller body. This structural design can not only eliminate the use of bolts in the traditional threaded connection method and reduce costs, but also simplify the processing technology and assembly operation, save time and effort, and improve assembly efficiency.

[0027] 2. This utility model features an inner and outer ring on the end cap of the support roller. The inner ring is inserted into the inner cavity of the roller body, and the outer ring is inserted into a groove on the end face of the roller body. A specific angle is set on the corresponding sidewalls of the outer ring and the groove. This forces the floating sealing cavity within the roller body to connect to the outside through a multi-fold, circuitous path. This multi-fold, circuitous path structure and the specific angle design make it difficult for external debris to enter the floating sealing cavity, thus protecting the floating sealing assembly and preventing sealing failure. The reliable sealing of the floating sealing assembly effectively prevents lubricating oil leakage from the support roller, avoiding problems such as poor lubrication and premature failure due to oil leakage, and extending the service life of the support roller.

[0028] 3. This utility model applies the modified support roller to tracked construction machinery, which can effectively prevent mud, grass clippings and other debris adhering to the track from falling into the floating sealing cavity of the support roller, thereby protecting the support roller and ensuring the reliable operation of the tracked construction machinery.

[0029] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of one embodiment of tracked engineering machinery;

[0032] Figure 2 This is a structural cross-sectional view of one embodiment of the floating seal assembly;

[0033] Figure 3 This is a structural cross-sectional view of one embodiment of a support roller in the prior art;

[0034] Figure 4 This is a schematic diagram of the external structure of one embodiment of the support roller proposed in this utility model;

[0035] Figure 5 yes Figure 4 The structural cross-sectional view of the support roller is shown below;

[0036] Figure 6 yes Figure 5 Enlarged view of part A of the structure;

[0037] Figure 7 yes Figure 5 Enlarged view of part B of the structure;

[0038] Figure 8 yes Figure 4 A schematic diagram of the external structure of one embodiment of the central wheel body;

[0039] Figure 9 yes Figure 8 The diagram shows a cross-sectional view of the wheel body.

[0040] Figure 10 yes Figure 4 A schematic diagram of one embodiment of the middle end cap;

[0041] Figure 11 yes Figure 10 Rear view of the end cap shown;

[0042] Figure 12 yes Figure 10 The end cap shown is a structural cross-sectional view.

[0043] In the diagram, 1. Wheel body; 2. End cap; 3. Bushing; 4. Bolt; 5. Groove; 6. Clearance; 7. Floating sealing cavity; 10. Floating sealing assembly; 11. Inner floating seal ring; 12. Outer floating seal ring; 20. Floating sealing cavity; 21. O-ring seal; 22. O-ring seal; 61. Bottom surface; 62. Inner wall; 63. Outer wall; 64. Clearance; 65. Space; 100. Tracked vehicle; 110. Frame; 111. Supporting component; 112. Supporting component; 113. Bracket; 120. Running gear; 121. Drive wheel; 122. Driven wheel; 124. Track roller; 125. Track; 130. Slewing mechanism; 140. Operating mechanism. Longitudinal mechanism; 150, working device; 200, support roller; 210, wheel body; 211, inner end face; 212, outer end face; 213, flange; 214, inner cavity; 215, opening; 216, groove; 217, inner annular surface; 218, outer annular surface; 219, limiting groove; 220, wheel axle; 221, assembly hole or positioning hole; 222, oil injection hole; 230, bushing; 231, boss; 232, stop; 240, end cover; 241, cover plate; 242, intermediate circumferential ring; 243, inner circumferential ring; 244, outer circumferential ring; 245, shaft hole; 246, intermediate trapezoidal surface; 247, outer circumferential trapezoidal surface; 248, transition surface; 250, oil plug. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0045] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or internal communication within components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0047] like Figure 1 As shown, the tracked construction machinery in this embodiment is a tracked vehicle 100, such as an excavator, and mainly includes components such as a frame 110, a traveling mechanism 120, a slewing mechanism 130, a control mechanism 140, and a working device 150.

[0048] The control mechanism 140 is mounted on the top surface of the frame 110 via the slewing mechanism 130, and can rotate 360° horizontally relative to the frame 110. The working device 150 is mounted on the control mechanism 140, and is controlled by the control mechanism 140 to perform excavation, bulldozing, and other related operations. The traveling mechanism 120 is mounted on the frame 110 and is used to drive the tracked vehicle 100 to move.

[0049] In this embodiment, the walking mechanism 120 mainly includes components such as a drive wheel 121, a driven wheel 122, a support roller 200, a carrier roller 124, and a track 125. The drive wheel 121 and driven wheel 122 are located at the left and right ends of the frame 110, respectively, and are mounted on a pair of support members 111 and 112 located at the left and right ends of the frame 110. The support roller 200 is mounted at the bottom of the frame 110 to support the weight of the vehicle and transfer it to the ground. Furthermore, the support roller 200 rolls on the track 125, preventing the track 125 from slipping laterally and ensuring that the track 125 will not fall off during turning or traveling. The carrier roller 124 is mounted above the frame 110, specifically on the top surface of the frame 110 via a bracket 113, to lift the track 125 upwards, ensuring that the track 125 has a certain tension and guaranteeing its normal operation and tension. The track 125 is wound around the drive wheel 121, driven wheel 122, track roller 200, and carrier roller 124 to increase the contact area between the vehicle and the ground, thereby effectively reducing pressure and ensuring that the tracked vehicle 100 can move smoothly and stably even in harsh road conditions (such as muddy ground, potholes, etc.).

[0050] When the tracked vehicle 100 travels on muddy or potholed surfaces, mud, grass clippings, and other debris inevitably adhere to its tracks 125. This debris may fall onto the track rollers 200, and some may even enter the floating seal cavity of the track rollers 200, causing the floating seal assembly to fail. Since the track rollers 200 contain lubricating oil, failure of the floating seal assembly will lead to lubricating oil leakage. Oil leakage will cause premature damage to the track rollers 200 due to poor lubrication, shortening their service life.

[0051] To address the aforementioned issues, this embodiment modifies the structure of the support roller 200 to effectively block external debris and prevent it from falling into the floating sealing cavity of the support roller 200, thus ensuring the continuous effectiveness of the floating seal.

[0052] Specifically, combined Figure 4 , Figure 5 As shown, the support roller 200 in this embodiment mainly involves key components such as wheel body 210, wheel axle 220, bushing 230, end cover 240, oil plug 250, and floating seal assembly 10.

[0053] Among them, such as Figure 8 , Figure 9 As shown, the wheel 210 in this embodiment has two end faces opposite each other along its axial direction. The end face facing the frame 110 can be defined as the inner end face 211, and the end face away from the frame 110 can be defined as the outer end face 212, depending on the mounting direction of the wheel 210 on the frame 110. Flanges 213 are formed on opposite sides of the outer circumferential surface of the wheel 210 along its axial direction to clamp the track chain of the track 125, preventing the track 125 from derailing and ensuring that the tracked vehicle 100 can travel normally along the track 125.

[0054] A hollow inner cavity 214 is provided inside the wheel body 210. The inner cavity 214 passes through the inner end face 211 and the outer end face 212 of the wheel body 210 with the central axis of the wheel body 210 as the axis, and forms an opening 215 on the inner end face 211 and the outer end face 212.

[0055] A groove 216 is formed around the opening 215 on the inner end face 211 and the outer end face 212 of the wheel body 210, respectively. The groove 216 divides the inner end face 211 and the outer end face 212 of the wheel body 210 into an inner ring surface 217 and an outer ring surface 218. In some embodiments, the inner ring surface 217 may be configured to be recessed inward relative to the outer ring surface 218 toward the inner cavity 214 to facilitate the installation of the end cap 240.

[0056] To achieve the rotational assembly between the wheel body 210 and the axle 220, such as Figure 5As shown, a bushing 230 is installed in the inner cavity 214 of the wheel body 210. To simplify the machining process and assembly operation of the wheel body 210 and the bushing 230, this embodiment uses an interference fit to fix the outer ring of the bushing 230 in the inner cavity 214 of the wheel body 210, so that the outer ring of the bushing 230 can rotate with the wheel body 210. The axle 220 is inserted into the inner cavity 214 of the wheel body and fixedly assembled with the inner ring of the bushing 230, thereby allowing the wheel body 210 to rotate freely relative to the axle 220.

[0057] In some embodiments, the axle 220 can be configured to pass through the inner cavity 214 of the wheel body, with both ends of the axle 220 extending beyond the inner end face 211 and the outer end face 212 of the wheel body 210. A mounting hole or positioning hole 211 can be provided at the end of the axle 220 exposed on the inner end face 211 of the wheel body for mounting the axle 220 onto the frame 110 or defining the mounting position of the axle 220 on the frame 110. An oil filling hole 222 can be provided at the end of the axle 220 exposed on the outer end face 212 of the wheel body for injecting lubricating oil into the inner cavity 214 of the wheel body. After oiling is completed, an oil plug 250 can be installed in the oil filling hole 222 to seal the oil filling hole 222 and prevent lubricating oil from leaking through the oil filling hole 222.

[0058] In some embodiments, the bushing 230 can be completely housed within the inner cavity 214 of the wheel body, and the two end faces of the bushing 230, which are positioned opposite each other in the axial direction, can be recessed relative to the opening 215 of the wheel body 210, such as... Figure 6 As shown, this is to facilitate the mating of the end cap 240, which confines the floating sealing cavity 20 within the inner cavity 214 of the wheel body.

[0059] To achieve stable assembly of the floating seal assembly 10, a boss 231 can be formed on each of the two axially opposite end faces of the bushing 230, such as... Figure 6 As shown. The boss 231 is arranged around the outer edge of the two opposite end faces of the bushing along the axial direction to limit the inner floating seal ring 11 and O-ring 21 in the floating seal assembly 10.

[0060] Specifically, the floating seal assembly 10 can be fitted onto the axle 220, with the inner floating seal ring 11 adjacent to and facing the inner wall of the bushing boss 231. The O-ring 21 is pressed between the inner floating seal ring 11 and the inner wall of the bushing boss 231, so that the inner floating seal ring 11 and the O-ring 21 can rotate synchronously with the wheel body 210. The outer floating seal ring 12 and the O-ring 22 can be pressed against the end cap 240 and remain stationary with the end cap 240. The floating seal assembly 10, in conjunction with the end cap 240, seals the inner cavity 214 of the wheel body to prevent leakage of lubricating oil injected into the inner cavity 214 of the wheel body.

[0061] To limit the installation position of the bushing 230 within the inner cavity 214 of the wheel body, a limiting groove 219 can be formed on the peripheral wall of the inner cavity 214 of the wheel body. Figure 6 , Figure 9 As shown. The limiting groove 219 includes two sections, positioned near the openings 215 at both ends of the wheel body within the inner cavity 214, and forming a ring around the peripheral wall of the inner cavity 214. A stop member 232, such as a snap ring or retaining ring, is installed in each limiting groove 219, and the stop member 232 is positioned against the outer end face of the bushing boss 231 to restrict the installation position of the bushing 230 within the inner cavity 214.

[0062] In some embodiments, the stop 232 is located within the floating sealing cavity 20 formed by the end cover 240 and the bushing boss 231.

[0063] To reduce the possibility of external debris entering the floating sealing cavity 20, combined with Figures 10 to 12 As shown, the end cap 240 in this embodiment includes a cover plate 241, a middle ring 242, an inner ring 243, and an outer ring 244 as its main components.

[0064] The cover plate 241 has an inner side facing the inner cavity 214 of the wheel and an outer side opposite to the inner side. A shaft hole 245 is provided at the center of the cover plate 241 for the wheel axle 220 to pass through.

[0065] To simplify the assembly of the end cover 240 and the axle 220, the end cover 240 can be fixedly assembled on the axle 220 by an interference fit, so that the end cover 240 can remain stationary with the axle 220 when the support roller 200 is working.

[0066] Considering the stability of the assembly between the end cap 240 and the axle 220, this embodiment provides an intermediate retaining ring 242 on the inner side of the cover plate 241, such as... Figure 11 As shown. An intermediate retaining ring 242 is arranged perpendicular to the inner surface of the cover plate 241 and extends away from the cover plate 241. The intermediate retaining ring 242 is designed to be concentric with the shaft hole 245 and have the same radius. The intermediate retaining ring 242 is connected to the wheel axle 220 via an interference fit, as shown. Figure 5 As shown, the assembly area between the end cover 240 and the axle 220 can be increased, thereby achieving a stable assembly between the end cover 240 and the axle 220.

[0067] An inner circumferential ring 243 is provided on the inner side of the cover plate 241. The inner circumferential ring 243 is arranged perpendicular to the inner side of the cover plate 241 and extends away from the cover plate 241. The inner circumferential ring 243 is designed to be concentric with the intermediate circumferential ring 242, but its radius is larger than that of the intermediate circumferential ring 242, so that the inner circumferential ring 243 is arranged around the outer periphery of the intermediate circumferential ring 242. Figure 12As shown, the height of the inner circumferential ring 243 is greater than the height of the middle circumferential ring 242, and the outer radius of the inner circumferential ring 243 is slightly smaller than the radius of the opening 215 of the wheel body. Figure 5 As shown. Thus, when the end cap 240 is installed on the inner end face 211 and outer end face 212 of the wheel body 210, the inner circumferential ring 243 can be inserted into the opening 215 of the wheel body to seal the opening 215. Simultaneously, after the inner circumferential ring 243 is inserted into the wheel body opening 215, it is directly opposite and spaced from the boss 231 of the bushing 230, forming a floating sealing cavity 20 in the spaced area, where the stop member 232 is positioned.

[0068] like Figure 6 As shown, for the floating seal assembly 10 positioned between the end cap 240 and the bushing 230, the inner floating seal ring 11 is pressed against the boss 231 of the bushing 230 by an O-ring 21 installed in its outer sealing groove, and rotates synchronously with the wheel body 210. The outer floating seal ring 12 is pressed against the inner wall of the inner circumferential ring 243 of the end cap by an O-ring 22 installed in its outer sealing groove, and remains stationary with the end cap 240. During operation, the inner floating seal ring 11 rotates relative to the outer floating seal ring 12, thereby forming an oil film between the contact surfaces of the two floating seal rings 11 and 12, which serves as a seal.

[0069] An outer ring 244 is provided along the outer edge of the inner side of the cover plate 241, and the outer ring 244 is configured to extend away from the cover plate 241. The outer ring 244 can be designed to be concentric with the inner ring 243, so that the outer ring 244 is arranged around the outer periphery of the inner ring 243.

[0070] Based on the dimensions of the grooves 216 formed on the inner end face 211 and outer end face 212 of the wheel body 210, the radii of the end cap 241 and the outer ring 244 are designed to be adapted to fit the grooves. Figure 5 As shown, when the end cap 240 is installed on the inner end face 211 and the outer end face 212 of the wheel body, the outer ring 244 can be inserted into the groove 216, thereby completely covering the opening 215 of the wheel body 210.

[0071] The structural design of the end cap 240 and the wheel end face in this embodiment makes the communication path between the floating sealing cavity 20 and the outside world more winding and circuitous, forming a labyrinth structure. This structural design can effectively reduce the probability of debris such as soil and grass entering the floating sealing cavity 20, thereby protecting the floating sealing assembly 10 and preventing its sealing failure.

[0072] To further reduce the possibility of external debris entering the floating sealing cavity 20, in some embodiments, the groove 216 and the outer ring 244 can be designed to be inclined so that debris entering the groove 216 can automatically slide off and leave the wheel body 210.

[0073] Specifically, such as Figure 9 As shown, the groove 216 formed on the wheel body 210 may include a bottom surface 61, an inner sidewall 62, and an outer sidewall 63. The bottom surface 61 connects the inner sidewall 62 and the outer sidewall 63, with the inner sidewall 62 being closer to the opening 215 on the wheel body 210 than the outer sidewall 63. The outer sidewall 63 of the groove 216 is designed as an inclined surface, and this inclined surface is configured to extend outward from the bottom of the groove 216 toward the end face of the wheel body 210, that is, inclined away from the wheel body opening 215. Meanwhile, as... Figure 12 As shown, the outer ring 244 of the end cap 240 is flared outwards and inclined away from the cover plate 241. Thus, after the outer ring 244 is inserted into the groove 261, if external debris falls into the gap 64 formed by the outer ring 244 and the outer side wall 63 of the groove 216, or further intrudes into the space 65 formed by the outer ring 244 and the inner side wall 62 of the groove 216 through the gap 64, as long as the debris rotates with the wheel 210 to below the axle 220, such as... Figure 7 As shown, debris can automatically slide down the inclined surface formed by the outer ring 244 under its own weight to the outer wall 63 of the groove 216, and then slide down along the inclined outer wall 63, leaving the wheel body 210. This structural design can further reduce the probability of external debris intruding into the floating sealing cavity 20 and causing the floating sealing assembly 10 to fail.

[0074] To address the problem of external debris easily accumulating on the end cap in existing technologies, this embodiment features a structural design for the outer surface of the cover plate 241 of the end cap 240, such as... Figure 10 As shown, for example, the outer surface of the cover plate 241 of the end cap 240 is designed as a stepped surface that is higher in the middle and lower at the outer periphery, and the middle stepped surface 246 is designed to transition to the outer stepped surface 247 by an arc. The middle stepped surface 246 surrounds the outer periphery of the shaft hole 245, and the outer stepped surface 247 extends from the middle stepped surface 246 to the outer edge of the cover plate 241.

[0075] To simplify the manufacturing process of the end cap 240, in some embodiments, combined with Figures 10 to 12 As shown, the intermediate trapezoidal surface 246 can be designed as the connecting surface between the intermediate circumferential ring 242 and the inner circumferential ring 243, and the outer circumferential trapezoidal surface 247 can be designed as the connecting surface between the inner circumferential ring 243 and the outer circumferential ring 244. Figure 5As shown, the outer circumferential trapezoidal surface 247 is recessed relative to the outer annular surface 218 of the wheel body end face, while the inner circumferential trapezoidal surface 246 protrudes relative to the outer annular surface 218 of the wheel body end face. With this structural design, when debris such as dirt and grass falls from above onto the wheel body 210, because the outer circumferential trapezoidal surface 247 of the end cap 240 is recessed relative to the outer annular surface 218 of the wheel body end face, the debris will not accumulate on the outer circumferential trapezoidal surface 247 of the end cap 240, but will fall directly onto the transition surface 248 between the outer circumferential trapezoidal surface 247 and the intermediate trapezoidal surface 246 of the end cap 240. Since the transition surface 248 is an outer arc surface, debris is also unlikely to accumulate on the transition surface 248, but will slide down along the transition surface 248 and leave the wheel body 210, thus reducing the probability of external debris entering the wheel body groove 216.

[0076] Industrial applicability

[0077] The support roller 200 of this embodiment is installed on the tracked vehicle 100. During the movement of the tracked vehicle 100, the track 125 drives the wheel body 210 of the support roller 200 to rotate around the wheel axle 220.

[0078] When dirt, grass clippings, and other debris adhering to the track 125 are transported above the track roller 200 as the track 125 rotates, the debris falling from the track 125 will fall onto the wheel body 210 of the track roller 200. The end cap 240 installed on the track roller 200 can block most of the debris, keeping the floating sealing cavity 20 and the floating sealing assembly 10 clean. However, in occasional cases, a very small amount of debris may enter the gap 64 formed by the outer ring 244 of the end cap 240 and the outer wall 63 of the groove 216, and may even further intrude into the space 65 formed by the outer ring 244 and the inner wall 62 of the groove 216 through the groove 216.

[0079] The debris falling into space 65 will rotate with the wheel 210. When it rotates to below the axle 220, the debris will fall onto the inner wall of the outer ring 244 of the end cover under its own weight. Figure 7As shown. Because the inner wall of the outer ring 244 of the end cap slopes downward, debris will automatically slide down along the inner wall of the outer ring 244 of the end cap into the gap 64 formed by the outer ring 244 of the end cap and the outer wall 63 of the groove 216. Because the outer wall 63 of the groove 216 also slopes downward, debris will automatically slide out of the groove 216 and leave the wheel body 210. This effectively prevents debris from entering the floating sealing cavity 20 inside the wheel body 210 and damaging the floating sealing assembly 10, thereby eliminating the problem of lubricating oil leakage inside the wheel body 210 due to sealing failure of the floating sealing assembly 10. The reliable sealing of the lubricating oil inside the wheel body 210 can ensure that the track roller 200 will not be damaged prematurely due to poor lubrication, ensuring the service life of the track roller and facilitating the reliable operation of the tracked vehicle 100.

[0080] Of course, the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A support roller, characterized in that, include: The wheel body has two end faces that are opposite each other in the axial direction and an inner cavity that axially penetrates the end faces. The inner cavity forms an opening on the end face, and a groove is formed around the opening on the end face. A bushing, located in the inner cavity, includes an outer ring and an inner ring that can rotate relative to each other, the outer ring being interference-fitted with the wheel body; A wheel axle, which is fixedly assembled with the inner ring of the bushing; An end cap has a cover plate with a shaft hole, through which the axle passes and is fixedly assembled with the cover plate; an inner ring and an outer ring extending away from the cover plate are provided on the inner side of the cover plate, the inner ring being inserted into an opening formed in the inner cavity on the end face of the wheel body, and the outer ring being inserted into a groove formed in the end face of the wheel body; A floating sealing assembly is installed between the end cap and the bushing, and works with the end cap to seal the inner cavity of the wheel body.

2. The support roller according to claim 1, characterized in that, The outer ring of the end cap is arranged around the outer edge of the cover plate and slopes outward away from the cover plate; The outer wall of the groove away from the opening forms an inclined surface, which extends outward from the bottom of the groove toward the end face of the wheel.

3. The support roller according to claim 2, characterized in that, The groove divides the end face of the wheel into an inner annular surface and an outer annular surface; The outer edge of the end cap plate is recessed relative to the outer circumferential surface of the wheel body end face.

4. The support roller according to claim 3, characterized in that, The outer side of the end cap plate forms a stepped surface that is high in the middle and low at the outer periphery, and the middle stepped surface transitions to the outer stepped surface with an arc. The outer peripheral trapezoidal surface is recessed relative to the outer annular surface of the wheel body end face; The intermediate trapezoidal surface convexes outward relative to the outer annular surface of the wheel end face.

5. The support roller according to claim 4, characterized in that, A central ring extending away from the cover plate is provided on the inner side of the end cap. The central ring is arranged around the circumference of the shaft hole and is concentric with the shaft hole and has the same radius. The axle is interference-fitted with the central circumferential ring.

6. The support roller according to any one of claims 1 to 5, characterized in that, A ring of protrusions is formed on the end face of the bushing and the end cover. The protrusions are arranged around the outer edge of the end face of the bushing and are opposite to and spaced from the inner ring of the end cover. The spaced area forms a floating sealing cavity. The floating sealing assembly includes two floating sealing rings stacked along the axial direction of the wheel body to form an inner floating sealing ring and an outer floating sealing ring. A sealing groove is formed on the outer periphery of each floating sealing ring, and an O-ring is installed in each sealing groove. The O-ring installed in the inner floating sealing ring abuts against the boss of the bushing, and the O-ring installed in the outer floating sealing ring abuts against the inner ring of the end cover.

7. The support roller according to claim 6, characterized in that, A limiting groove is formed on the peripheral wall of the inner cavity of the wheel body, and a stop is installed in the limiting groove. The stop is located in the floating sealing cavity and abuts against the boss of the bushing to limit the installation position of the bushing in the inner cavity of the wheel body.

8. The support roller according to claim 7, characterized in that, The stop component is a retaining ring or a retaining ring.

9. The support roller according to claim 7, characterized in that, A set of end caps, floating sealing components, limiting grooves and stop members are respectively provided at two opposite ends in the direction of the wheel axis; The axle passes through the inner cavity and extends out of the wheel body at both ends. An assembly hole or positioning hole is provided at one end of the axle for mounting or positioning the axle on the frame. An oil injection hole is provided at the other end of the axle for injecting lubricating oil into the inner cavity of the wheel body. An oil plug is installed in the oil injection hole to seal the oil injection hole.

10. A tracked engineering machine, characterized in that, It includes a frame, tracks, and track rollers as described in any one of claims 1 to 9; the track rollers have axles mounted on the bottom of the frame and roll on the tracks in contact with the ground to transfer the weight of the entire machine to the ground.

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