Thrust wheel, assembling method and engineering machinery

Abstract

The invention discloses a thrust wheel, an assembling method and engineering machinery in the technical field of engineering machinery. The thrust wheel comprises a thrust wheel body, a thrust wheel shaft and a shaft seat assembly. The thrust wheel shaft is axially arranged in the through hole of the thrust wheel body in a penetrating manner; a shaft sleeve is directionally arranged between the thrust wheel shaft and the thrust wheel body through hole, the shaft sleeve is fixedly connected with the thrust wheel shaft, and a first sealing body is arranged on the thrust wheel shaft and the shaft sleeve; the shaft seat assemblies are fixed to the two ends of the thrust wheel shaft and fixedly connected with the thrust wheel body, and second sealing bodies are arranged among the shaft seat assemblies, the thrust wheel shaft and the shaft sleeve. A cavity for containing oil liquid is formed among the shaft seat assembly, the thrust wheel body and the thrust wheel shaft. According to the thrust wheel, the first sealing bodies are positioned on the thrust wheel shaft and the shaft sleeve, the second sealing bodies are arranged among the shaft seat assembly, the thrust wheel shaft and the shaft sleeve, and the sealing performance among components on the thrust wheel is guaranteed through the two sealing bodies.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, in particular to a supporting wheel, an assembling method and an engineering machinery. BACKGROUND

[0002] The supporting wheel is an important component in the four-wheel one-track chassis of the tracked engineering machinery, which is mainly used for supporting the weight of the main engine of the bulldozer and other engineering machinery, and realizing walking under the driving of the track. During the working process of the bulldozer, the supporting wheel bears a large load and impact force, and the working environment is mostly dust, sand and other harsh environments, so the supporting wheel has high requirements on the load capacity, sealing performance and wear resistance.

[0003] The existing supporting wheel of the bulldozer has the following disadvantages, first, the wheel body is welded by left and right half wheel bodies, and the welding quality of the wheel body directly affects the performance of the supporting wheel; second, the assembling process is unreasonable: the assembly precision is not high during the assembly of the shaft sleeve and the wheel body, which leads to a large vibration and noise of the supporting wheel during operation, reduces the load capacity; the sealing performance is poor, oil leakage is easy to occur, the lack of lubrication leads to the aggravation of the wear of internal parts, and affects the service life of the product.

[0004] Since the assembly of the wheel body is not airtight, the performance and service life of the supporting wheel are reduced, which is a technical problem to be solved in the field. SUMMARY

[0005] The purpose of the present application is to provide a supporting wheel, an assembling method and an engineering machinery to solve the above-mentioned defects caused by the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: In a first aspect, the present application discloses a supporting wheel, which comprises a supporting wheel body; a supporting wheel shaft, which is axially arranged in a through hole of the supporting wheel body; a shaft sleeve is arranged between the supporting wheel shaft and the through hole of the supporting wheel body, the shaft sleeve is fixedly connected with the supporting wheel shaft, and a first sealing body is arranged on the supporting wheel shaft and the shaft sleeve; a shaft seat assembly, which is fixed at both ends of the supporting wheel shaft and is fixedly connected with the supporting wheel body, and a second sealing body is arranged between the shaft seat assembly, the supporting wheel shaft and the shaft sleeve; Wherein, the shaft seat assembly, the supporting wheel body and the supporting wheel shaft form a cavity for containing oil.

[0007] In a further embodiment of this application, a plurality of guide rods are radially parallel to each other at the end of the support roller body. The guide rods are arranged along the axial direction of the support roller body. The bushing is provided with guide holes. The bushing is axially fitted and assembled to the support roller shaft. The bushing and the support roller body are fixed by bolts.

[0008] In a further embodiment of this application, the first sealing body includes a first sealing element and a second sealing element; The first seal is fixed between the support roller axle and the bearing assembly, and the second seal is fixed between the support roller body and the bushing.

[0009] In a further embodiment of this application, the second sealing body includes a floating seal ring and a floating seal ring; The floating seal ring is fixed between the support roller axle and the bushing, and the floating seal ring is fixed between the bearing assembly and the support roller axle.

[0010] In a further embodiment of this application, the support roller body includes an integrally formed first side roller and second side roller; The first side wheel, the second side wheel and the support wheel axle have the same mounting structure.

[0011] A further improvement is that the first side wheel and the second side wheel are arranged symmetrically.

[0012] Secondly, this application further discloses an engineering machine that includes the aforementioned track roller.

[0013] Thirdly, this application also discloses a method for assembling the aforementioned support rollers, which includes... Lubricating oil is applied to the first sealing assembly and it is installed on the bushing and the support roller shaft using a tooling. The support roller axle is inserted into the through hole of the support roller body, and the flange of the bushing is positioned away from the through hole. The bushing is oriented to fit the support roller axle. The tapered guide head of the bushing is pressed into the through hole of the support roller body by a coaxial pressing press, and the bushing and the support roller body are fixed with bolts. The second sealing body is pressed into the groove of the bearing assembly and the bushing; The bearing assemblies are respectively set at both ends of the support roller axle, clamped by a press, and the ends of the bearing assemblies are limited by steel wire retaining rings to complete the assembly of the support roller.

[0014] Further solutions to this application, It also includes the track roller testing stage; this includes a first stage and a second stage. First stage: The support roller is pressed against the bearing assemblies at both ends of the support roller by the running-in machine, which drives the support roller body to rotate and run in the second seal body, so that the second seal body forms an initial sealing state. Second stage: the air tightness threshold of the supporting wheel; test the sealing performance of the supporting wheel oil cavity under the pressure of 0.4 MPa, if the air tightness value is less than the threshold, the sealing performance test is passed; then inject lubricating oil into the oil hole of the axle seat assembly; If the air tightness value is greater than the threshold, the supporting wheel is disassembled and reassembled.

[0015] Further schemes of the present application, After the second sealing body is installed, the inclination of the floating sealing ring is ≤1 mm.

[0016] The beneficial effects of the present application are: In the present application, the first sealing body is positioned and arranged on the supporting wheel shaft and the shaft sleeve, the second sealing body is arranged between the axle seat assembly, the supporting wheel shaft and the shaft sleeve, and the sealing bodies at two places ensure the sealing performance between the components on the supporting wheel. In actual manufacturing, the two sealing bodies can be placed in the corresponding grooves through special tooling, which can solve the risk of distortion of the sealing body and effectively avoid the oil leakage problem caused by the distortion of the sealing body.

[0017] The shaft sleeve is pressed into the supporting wheel body using a press, and the guide shaft of the press is used to accurately position the bolt holes on the shaft sleeve and the wheel body, which facilitates the subsequent installation and fixation of the bolts, effectively avoids the additional torsional damage to the bolts caused by the misalignment of the bolt holes, and improves the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic diagram of the axial half-section structure of the supporting wheel in the embodiment of the present application; Figure 2 FIG. 2 is a schematic diagram of the exploded structure of the supporting wheel in the embodiment of the present application; Figure 3 FIG. 3 is a schematic diagram of the structure of the supporting wheel body in the embodiment of the present application; Figure 4 FIG. 4 is a schematic diagram of the structure of the assembly of the shaft sleeve and the supporting wheel shaft in the embodiment of the present application; Figure 5 FIG. 5 is a schematic diagram of the structure of the special tooling for installing the first sealing body in the embodiment of the present application; Figure 6 FIG. 6 is a logic diagram of the assembly method of the supporting wheel in the embodiment of the present application.

[0019] Among them: 1, supporting wheel body; 101, guide rod; 102, first side wheel; 103, second side wheel; 2, supporting wheel shaft; 3, first axle seat; 4, first sealing member; 5, floating sealing ring; 6, floating sealing rubber ring; 7, shaft sleeve; 8, second sealing member; 9, gasket; 10, bolt; 11, second axle seat; 12, steel wire retainer; 13, screw plug; 100, first connecting piece; 200, second connecting piece. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment below is actually only illustrative, but not as any limitation on the present application and its application or use.

[0021] As shown in Figure 1 and Figure 2 , the present application discloses an embodiment, which refers to a supporting wheel with a long service life; the supporting wheel comprises a supporting wheel body 1, a supporting wheel shaft 2 and a shaft seat assembly; the supporting wheel shaft 2 is axially arranged in the through hole of the supporting wheel body 1; the shaft sleeve 7 is arranged between the supporting wheel shaft 2 and the through hole of the supporting wheel body 1, and the shaft sleeve 7 is fixedly connected with the supporting wheel shaft 2; the first sealing body is arranged on the supporting wheel shaft 2 and the shaft sleeve 7. The shaft seat assembly is fixed at both ends of the supporting wheel shaft 2 and is fixedly connected with the supporting wheel body 1; the second sealing body is arranged between the shaft seat assembly, the supporting wheel shaft 2 and the shaft sleeve 7; and the cavity for containing oil is formed between the shaft seat assembly, the supporting wheel body 1 and the supporting wheel shaft 2.

[0022] In the embodiment, the first sealing body is arranged on the supporting wheel shaft 2 and the shaft sleeve 7; the second sealing body is arranged between the shaft seat assembly, the supporting wheel shaft 2 and the shaft sleeve 7; the high sealing performance between the parts is ensured, the oil leakage phenomenon in the cavity formed by the shaft seat assembly, the supporting wheel body 1 and the supporting wheel shaft 2 is prevented, and the service life of the supporting wheel is improved.

[0023] In some embodiments, a supporting wheel is specifically designed as follows; As shown in Figure 3 and Figure 4As shown, in order to ensure the structural strength of the supporting wheel body 1 in the embodiment, the supporting wheel body 1 is divided into two parts of the first side wheel 102 and the second side wheel 103, which are integrally formed by casting, avoiding stress concentration, weld cracking and other hidden troubles caused by welding and splicing of the wheel body, so that the structural stability is stronger, and the service life of the supporting wheel is longer. At the same time, the utilization rate of the material is improved, the production efficiency of the supporting wheel is improved, and the production cost is saved; the connecting structure between the first side wheel 102, the second side wheel 103 and the supporting wheel shaft 2 is the same, and the connecting structure of one side will be described below; the supporting wheel shaft 2 in the embodiment passes through the first side wheel 102, and the above-mentioned shaft sleeve 7 needs to be installed in a specific direction. In order to ensure the installation accuracy of the shaft sleeve 7, a plurality of guide rods 101 are fixed on the circumferential side of the first side wheel 102 in the axial direction. The lengths of the guide rods 101 are consistent, and the guide rods 101 are parallel to each other. The guide rods 101 are arranged in the axial direction of the first side wheel 102. The shaft sleeve 7 is provided with a guide hole, and the shaft sleeve 7 is axially sleeved and assembled to connect the supporting wheel shaft 2. The contact surface between the shaft sleeve 7 and the first side wheel 102 is fixed by the bolt 10. The arrangement of the guide rods 101 not only ensures the flatness of the installation of the shaft sleeve 7, but also ensures the butt joint accuracy of the screw holes between the shaft sleeve 7 and the first side wheel 102, so that the shaft sleeve 7 can be quickly assembled.

[0024] Continue to observe the attached Figure 1 And Figure 2 The shaft seat assembly in the embodiment includes a first shaft seat 3 and a second shaft seat 11. The connecting structure at the first side wheel 102 is described: The first sealing body in the embodiment includes a first sealing piece 4 and a second sealing piece 8. The first sealing piece 4 is fixed in the O-shaped groove of the supporting wheel shaft 2 and between the first shaft seat 3. The second sealing piece 8 is fixed in the O-shaped groove of the left shaft sleeve 7 and contacts the first side wheel 102. The first sealing piece 4 and the second sealing piece 8 herein can use O-shaped sealing rings, and the sizes of the two are adaptively selected according to specific needs.

[0025] The second sealing body in the embodiment includes a floating sealing rubber ring 6 and a floating sealing ring 5, which are arranged adjacent to each other during installation. The floating sealing rubber ring 6 is fixed in the floating sealing groove of the left shaft sleeve 7 and directly contacts the supporting wheel shaft 2 after installation. The floating sealing ring 5 is fixed in the floating sealing groove of the first shaft seat 3 and contacts the supporting wheel shaft 2 after installation. The inclination of the floating sealing ring 5 is ≤1mm.

[0026] It should be noted that the connecting structure between the second side wheel 103 and the supporting wheel shaft 2 is the same as the connecting structure between the first side wheel 102 and the supporting wheel shaft 2 described above, and the first side wheel 102 and the second side wheel 103 are arranged in the design.

[0027] The application also provides an embodiment, which is an assembling method for assembling the support wheel in the above embodiment, and the assembling method comprises the following steps: Confirm the quality of each component, clean the surface of the workpiece, and pay special attention to cleaning the position of the oil cavity to ensure the cleanliness of the workpiece.

[0028] The second sealing element 8 is sleeved into the O-shaped groove of the shaft sleeve 7 by using a tool, and a layer of lubricating oil is applied to the outer circle of the second sealing element 8 by using a brush, so that the shaft sleeve 7 is pressed into the support wheel body 1 to avoid the distortion of the second sealing element 8 and ensure the sealing effect of the second sealing element 8. Figure 5 The tool comprises a first connecting element 100 and a second connecting element 200 which are hinged, and the first connecting element 100 and the second connecting element 200 are circular through holes in the middle after being closed. The two connecting elements have an arc-shaped mounting area, and the second sealing element 8 is sleeved on the mounting area when the second sealing element 8 is mounted. The first connecting element 100 and the second connecting element 200 are enclosed on one side of the O-shaped groove, and the second sealing element 8 is manually pushed into the groove. The first sealing element 4 is also mounted in the same way.

[0029] A thin layer of lubricating oil is applied to the inner hole wall of the support wheel body 1, the support wheel shaft 2 is inserted into the inner hole of the support wheel body 1 at about the middle position, the guide rods 101 are respectively inserted into the threaded holes at the two ends of the support wheel body 1, and then the two shaft sleeves 7 are respectively sleeved onto the support wheel shaft 2 and the guide rods 101 with the flanges outward. The shaft sleeves 7 are gently pushed so that the tapered guide heads at the front ends of the shaft sleeves 7 are all inserted into the inner hole of the support wheel body 1. The wheel body assembly is pushed to the limiting groove of the shaft sleeve 7 pressing station, and the shaft sleeves 7 are pressed into the wheel body by means of the coaxial pressing machine.

[0030] The threaded connection of the bolt 10 is smeared with thread fastening glue, and the bolt 10 is inserted into the corresponding threaded holes of the shaft sleeve 77 and the support wheel body 1. A washer 9 is sleeved on the bolt 10. The bolt 10 is diagonally pre-tightened manually, and then the bolt 10 is tightened according to the torque requirement of the bolt 10 by using a torque wrench.

[0031] The floating seal ring 5 and the floating seal rubber ring 6 are dipped in alcohol, and the floating seal assembly is pressed into the floating seal grooves of the two shaft sleeves 7 and the two shaft seats by using a tool, and the inclination of the floating seal ring 5 is ensured to be ≤1mm.

[0032] The first sealing element 4 is sleeved into the O-shaped groove of the support wheel shaft 2 by using a special tool, and a layer of lubricating oil is applied to the outer circle of the first sealing element 4 by using a brush, so that the shaft seat is pressed into the support wheel shaft 2 to avoid the distortion of the O-shaped ring and ensure the sealing effect of the O-shaped ring.

[0033] The mounting surfaces of the first axle seat 3 and the second axle seat 11 are oriented in the same direction as the mounting surfaces corresponding to the wheel axle, and are assembled at the two ends of the supporting wheel axle 2 respectively, the two end axle seats are clamped by a double-action press, the steel wire retainer 12 is inserted into the mounting groove above the supporting wheel axle 2, two points are riveted at the entrance of the steel wire retainer 12 of the axle seat to prevent the retainer from falling off, and the limiting and retreat-preventing functions are achieved.

[0034] The assembly method in the embodiment also involves a supporting wheel detection stage, including a first stage and a second stage, the first stage is used for preliminary sealing of the second sealing body, and the second stage is used for detecting the sealing performance of the supporting wheel.

[0035] The first stage: the supporting wheel body 1 is pressed at the two ends of the axle seat by a running-in machine, the supporting wheel body 1 is driven to rotate, the second sealing body is subjected to rotational running-in, and the second sealing body forms an initial sealing state; The second stage: a supporting wheel sealing threshold value is set, the sealing performance of the oil cavity of the supporting wheel is tested under a pressure of 0.4 MPa, if the air tightness value is less than the threshold value, the sealing performance test is passed; lubricating oil is injected into the oil injection hole of the first axle seat 3, and the amount of the lubricating oil is controlled to be 75% of the cavity body; finally, the screw plug 13 is tightened to seal the oil cavity; here, the oil injection hole is arranged on the axle seat facing the outside of the vehicle after installation, which is convenient for later operation.

[0036] If the air tightness value is greater than the threshold value, the supporting wheel is disassembled and reassembled, and the test is performed again until the test is qualified.

[0037] The application also provides an embodiment, which discloses an engineering machine comprising the supporting wheel in the above embodiment; the engineering machine herein generally refers to a bulldozer.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0039] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood through specific circumstances.

Claims

1. A load wheel characterized by, The bearing wheel body comprises: A bearing wheel shaft is axially arranged in the through hole of the bearing wheel body; a shaft sleeve is arranged between the bearing wheel shaft and the through hole of the bearing wheel body, and the shaft sleeve is fixedly connected to the bearing wheel shaft; a first sealing body is arranged on the bearing wheel shaft and the shaft sleeve; An axle seat assembly is fixed at both ends of the bearing wheel shaft and is fixedly connected to the bearing wheel body; a second sealing body is arranged between the axle seat assembly, the bearing wheel shaft and the shaft sleeve; The axle seat assembly, the bearing wheel body and the bearing wheel shaft form a cavity for containing oil. A plurality of guide rods are radially and parallelly fixed at the ends of the bearing wheel body, the guide rods are arranged axially along the bearing wheel body, a guide hole is arranged on the shaft sleeve, the shaft sleeve is axially sleeved and assembled to the bearing wheel shaft, and the shaft sleeve and the bearing wheel body are fixed by bolts.

2. The wheel set according to claim 1, characterized in that The first sealing body comprises a first sealing member and a second sealing member; 3. The wheel set according to claim 1, wherein The first sealing member is fixed between the bearing wheel shaft and the axle seat assembly, and the second sealing member is fixed between the bearing wheel body and the shaft sleeve. The second sealing body comprises a floating sealing rubber ring and a floating sealing ring; 4. The wheel of claim 1, wherein The floating sealing rubber ring is fixed between the bearing wheel shaft and the shaft sleeve, and the floating sealing ring is fixed between the axle seat assembly and the bearing wheel shaft. The bearing wheel body comprises integrally formed first and second side wheels; 5. The wheel of claim 1, wherein The first and second side wheels have the same mounting structure as the bearing wheel shaft. The first and second side wheels are symmetrically arranged.

6. The wheel set according to claim 5, characterized in that The bearing wheel comprises the bearing wheel of any one of claims 1 to 6.

7. A working machine, characterised in that The first sealing assembly is coated with lubricating oil and mounted on the shaft sleeve and the bearing wheel shaft by a tool; 8. An assembling method, the method being applied to the wheel (1) according to any one of claims 1 to 6, characterized in that, The bearing wheel shaft is inserted into the through hole of the bearing wheel body, the flange of the shaft sleeve is arranged away from the through hole, the shaft sleeve is axially sleeved to the bearing wheel shaft, the conical guide head of the shaft sleeve is pressed into the through hole of the bearing wheel body by a coaxial line pressing machine, and the shaft sleeve and the bearing wheel body are fixed by bolts; The second sealing body is pressed into the notch of the axle seat assembly and the shaft sleeve; The axle seat assembly is arranged at both ends of the bearing wheel shaft respectively, clamped by a pressing machine, and limited at the ends by a steel wire retainer ring, thereby completing the assembly of the bearing wheel.

9. The assembly method according to claim 8, further comprising a bearing wheel detection stage, which comprises a first stage and a second stage. In the first stage, the axle seat assembly at both ends of the bearing wheel is pressed by a running-in machine, the bearing wheel body is driven to rotate, and the second sealing body is rotated and run-in, so that the second sealing body forms an initial sealing state. In the second stage, a bearing wheel air tightness threshold value is set. The sealing performance of the oil cavity of the bearing wheel is tested under a pressure of 0.4 MPa, if the air tightness value is less than the threshold value, the sealing performance test is passed, and lubricating oil is injected into the oil hole of the axle seat assembly. If the air tightness value is greater than the threshold value, the bearing wheel is disassembled and reassembled.

10. The assembly method according to claim 8, wherein the inclination of the floating sealing ring is less than or equal to 1 mm after the second sealing body is installed. ​ ​ ​ ​

Images