Input shaft assembly with bearing easy to disassemble, disassembling device, disassembling method, transfer case and engineering machinery

Abstract

The invention discloses an input shaft assembly with a bearing easy to disassemble, a disassembling device, a disassembling method, a transfer case and engineering machinery. The input shaft assembly comprises an input shaft, an input gear, a stop component and the bearing. The input shaft is a stepped shaft, and a first step is roughly located in the middle of the input shaft and divides the input shaft into a front half section area and a rear half section area. The input gear sleeves the middle position of the rear half section area of the input shaft, and the input gear and the input shaft are circumferentially fixed; the stop components are installed on the front side and the rear side of the input gear correspondingly, and axial fixing of the input gear and the input shaft is achieved. The bearings are arranged on the front portion and the rear portion of the rear half section area of the input shaft in a sleeving mode respectively, and the bearings are in interference fit with the input shaft. A groove extending inwards is formed in the position, where the bearing is installed, of the input shaft, and the inward extending position of the groove spans the bearing installation position arranged on the upper portion. And the groove is matched with the L-shaped pull rod penetrating into the groove to pull the bearing, so that the lossless disassembly of the bearing is realized.

Description

Technical Field

[0001] The present invention relates to an input shaft assembly and a transfer case with easily detachable bearings, belonging to the technical field of construction machinery. Background Art

[0002] High-power hydraulic drive excavators (hereinafter referred to as hydraulic excavators) distribute the engine power through a transfer case to achieve single or combined actions such as traveling, slewing, and excavating.

[0003] The power input of the transfer case for hydraulic excavators is the engine. According to the engine power value, the output power flow ranges from 3 to 7 branches. Generally speaking, the larger the overall machine power value, the more output power flows. To reduce costs, the transfer cases for hydraulic excavators mostly use parallel-stage gear meshing to achieve the shunt function, and preferably use the spur gear fixed-axis parallel shaft transmission method. Taking a 4-branch transfer case as an example for shunt, the engine transmits power to the input gear shaft, and the input gear shaft meshes with four output gear shafts at the same time to achieve the four-branch function.

[0004] Each gear shaft is installed in the bearing seat of the box body through deep groove ball bearings. A small clearance fit is adopted between the outer circle of the bearing and the inner hole of the bearing seat, and an interference fit is adopted between the inner hole of the bearing and the outer circle of the shaft; once the transfer case is assembled, it is difficult to disassemble the input gear shaft and its parts. The current mainstream disassembly method is to destructively disassemble the bearings, punch holes in the bearing cages, and disassemble the bearings by pulling the cages or the inner and outer rings of the bearings. Otherwise, it is impossible to smoothly disassemble parts such as bearings and gears.

[0005] The metal chips generated by punching the bearing cages enter the inside of the gearbox, which is likely to cause blockage of the oil holes, resulting in poor lubrication of the gears and bearings; the metal chips enter the gear meshing area, which may lead to the occurrence of gear pitting and tooth breakage failures, affecting the normal function of the transfer case. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides an input shaft assembly with easily detachable bearings, a disassembly device, a disassembly method, a transfer case, and a construction machinery, which can realize the easy disassembly of each shaft and its bearings in the transfer case, greatly shorten the maintenance cycle of the disassembly operation of the bearings on the shaft, and reduce the working intensity of maintenance workers.

[0007] The present invention is implemented according to the following technical solutions:

[0008] In a first aspect, the present invention provides an input shaft assembly with easily detachable bearings, including:

[0009] An input shaft, which is a stepped shaft. The first step is roughly located in the middle of the input shaft, dividing the input shaft into a front half-section area and a rear half-section area. A spline or a keyway is provided in the front half-section area;

[0010] The input gear is sleeved on the middle position of the rear half section of the input shaft, and circumferential fixation is achieved between the opposite circumferential surfaces of the two through an installation and fixation component.

[0011] The stop components are respectively installed on the front and rear sides of the input gear to achieve axial fixation of the input gear and the input shaft.

[0012] The bearings are respectively sleeved on the front and rear positions of the rear half section of the input shaft, and an interference fit is provided between the bearings and the input shaft.

[0013] Wherein, a groove extending axially inward is provided at the position of the input shaft where the bearing is installed, and the inward extension position of the groove straddles the bearing installation position arranged above; the groove cooperates with the L-shaped pull rod inserted therein to pull the bearing, thereby realizing the disassembly of the bearing.

[0014] In some embodiments, the rear half section of the input shaft is divided into three regions, namely, a front region, a middle region, and a rear region, by a second step and a third step, and the middle region protrudes from the front and rear regions; the two bearings are respectively sleeved on the front region and the rear region in a tight fit manner, and the input gear is sleeved on the middle region.

[0015] In some embodiments, the groove located below the rear bearing axially extends from the end face of the input shaft to the end face of the third step, and continues to radially extend a certain distance at the end face of the third step. At this time, the axial cross section of the groove is a "﹂"-shaped structure; the groove located below the front bearing axially extends from the end face of the first step to the end face of the second step, and continues to radially extend a certain distance at the end face of the second step. At this time, the axial cross section of the groove is a mirror image structure of the "﹂"-shaped structure.

[0016] In some embodiments, two grooves are respectively provided on the input shaft below the front bearing and the rear bearing, and the two grooves are circumferentially arranged and are 180 degrees apart.

[0017] In some embodiments, the fixation component is a flat key; an axial groove is respectively provided on the inner arc circumferential surface of the input gear and the outer arc circumferential surface of the input shaft, and the flat key is placed in the axially opposite grooves.

[0018] In some embodiments, the stop component is an open snap ring; an annular groove is respectively provided on the outer arc circumferential surface of the input shaft on the front and rear sides of the axial groove, and the axial groove communicates with the annular grooves on both sides; the snap rings are respectively snapped into the two annular grooves, and the protruding parts of the snap rings from the annular grooves are attached to the axial end faces of the input gear to axially limit the input gear and the flat key.

[0019] In a second aspect, the present invention provides a disassembly device for the above-mentioned bearing-easily-detachable input shaft assembly, including:

[0020] A pushing plate, with a symmetrically arranged clamping groove provided at each of the two ends in its length direction;

[0021] An L-shaped pull rod, arranged on both sides of the pushing plate, the long arm of the L-shaped pull rod is inserted into the corresponding clamping groove, and after the short arm of the L-shaped pull rod extends into the root of the groove, it can hook the bearing;

[0022] A fastening member, configured to fix and release the fixation between the L-shaped pull rod and the pushing plate;

[0023] A pushing member, configured to apply a pressing force to the pushing plate, move the pushing plate away from the bearing, and then the pushing plate drives the two L-shaped pull rods to pull out the bearing.

[0024] In some embodiments, an external thread is provided on the long arm of the L-shaped pull rod; the fastening member is composed of two nuts, and the two nuts are respectively sleeved on the long arms of the L-shaped pull rods on both sides of the pushing plate, and the fixation and release of the fixation between the L-shaped pull rod and the pushing plate are realized by tightening the two nuts or loosening at least one nut.

[0025] In some embodiments, a circular convex platform and a threaded hole located at the center of the circular convex platform are provided in the middle area of the pushing plate; when the pushing member is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, it is positioned by the circular convex platform; when the pushing member is a lead screw, the lead screw is screwed into the threaded hole, and the circumferential rotation of the lead screw is converted into an axial linear motion.

[0026] In a third aspect, the present invention provides a disassembly method, which is implemented by using the above disassembly device;

[0027] Insert the two L-shaped pull rods into the corresponding grooves, and the short arms of the L-shaped pull rods move forward along the U-shaped cavity formed by the grooves and the inner hole of the bearing;

[0028] After the short arms of the L-shaped pull rods enter the root of the grooves, they can move radially away from the center position of the bearing. Place the pushing member between the input shaft and the pushing plate, push the L-shaped pull rods radially outwards, so that the short arms of the L-shaped pull rods are in contact with the end face of the bearing inner ring against the shaft shoulder, and use the fastening member to fix the L-shaped pull rods and the pushing plate together;

[0029] The pushing member is pushed, and the two L-shaped pull rods on both sides pull the bearing outwards. When the inner ring of the bearing is separated from the input shaft, loosen the fastening member, remove the bearing, and complete the non-destructive disassembly of the bearing.

[0030] In a fourth aspect, the present invention provides a transfer case, including:

[0031] A housing;

[0032] The above-mentioned bearing-easy-disassembly input shaft assembly is installed in the housing, and the front half region of the input shaft penetrates out of the housing; the input shaft assembly is radially positioned with the housing through bearings on both sides;

[0033] A plurality of output shaft assemblies, and the output gears in each output shaft assembly are all meshed with the input gear;

[0034] An input shaft through cover assembly, which is fixed on the housing near the rear half region of the input shaft through circumferential bolts to axially position the input shaft assembly;

[0035] An input shaft blind cover assembly, which is fixed on the housing near the rear half region of the input shaft through circumferential bolts to axially position the input shaft assembly.

[0036] In a fifth aspect, the present invention provides a disassembly device applied to the above-mentioned transfer case, including:

[0037] A push plate, with a symmetrically arranged card slot at each of the two ends in its length direction;

[0038] An L-shaped pull rod, arranged on both sides of the push plate, the long arm of the L-shaped pull rod is inserted into the corresponding card slot, and after the short arm of the L-shaped pull rod extends into the root of the groove, it can hook the bearing;

[0039] A fastening member, which is configured to fix and release the fixation between the L-shaped pull rod and the push plate;

[0040] A push member, which is configured to apply a pressing force to the push plate, push the push plate away from the bearing, and then the push plate drives the two L-shaped pull rods to pull out the bearing.

[0041] In some embodiments, the long arm of the L-shaped pull rod is provided with an external thread; the fastening member is composed of two nuts, and the two nuts are respectively sleeved on the long arms of the L-shaped pull rods on both sides of the push plate, and the fixation and release of the fixation between the L-shaped pull rod and the push plate are realized by tightening the two nuts or loosening at least one nut.

[0042] In some embodiments, a circular boss and a threaded hole located at the center of the circular boss are provided in the middle region of the push plate; when the push member is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, it is positioned through the circular boss; when the push member is a lead screw, the lead screw is screwed into the threaded hole to convert the circumferential rotation of the lead screw into an axial linear motion.

[0043] In a sixth aspect, the present invention provides a disassembly method, which is implemented by using the above-mentioned disassembly device;

[0044] Place the transfer case horizontally, keep the input shaft blind cover assembly vertically upward, and remove the input shaft blind cover assembly;

[0045] Insert two L-shaped pull rods vertically from directly above into the corresponding grooves, and the short arms of the L-shaped pull rods move forward along the U-shaped cavity formed by the grooves and the inner hole of the bearing;

[0046] After the short arms of the L-shaped pull rods enter the root of the grooves, they can move radially away from the center position of the bearing. Place the pushing component between the input shaft and the pushing plate, push the L-shaped pull rods radially outward, so that the short arms of the L-shaped pull rods are in contact with the end face of the shoulder of the inner ring of the bearing, and use fastening components to fix the L-shaped pull rods and the pushing plate together;

[0047] The pushing component makes a push, and the two L-shaped pull rods on both sides pull the bearing outward. Wait until the inner ring of the bearing disengages from the input shaft, loosen the fastening components, remove the bearing, and complete the non-destructive disassembly of the bearing;

[0048] After removing the bearing, take out the stop component adjacent to the bearing, and the input gear and the input shaft can be disassembled and separated, realizing the non-destructive disassembly of the input gear;

[0049] Flip the input shaft assembly and repeat the above disassembly steps to realize the non-destructive disassembly of the other bearing.

[0050] In a seventh aspect, the present invention provides a construction machinery, including the above-mentioned input shaft assembly with easy-to-remove bearings; or, including the above-mentioned transfer case.

[0051] Advantages of the present invention:

[0052] After the implementation of the present invention, the non-destructive disassembly method using a hydraulic cylinder or a screw replaces the drilling-type destructive disassembly process, which will effectively reduce the disassembly difficulty and workload of the bearing, avoid potential fault hazards caused by metal chips generated by drilling to the inside of the transfer case, and at the same time shorten the disassembly working hours; most significantly, the bearing will not be damaged during the disassembly process, reducing the maintenance cost of the transfer case. Description of the drawings

[0053] The drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0054] In the drawings:

[0055] Figure 1 is a cross-sectional view of the input shaft assembly of the present invention;

[0056] Figure 2 is a schematic structural diagram of the input shaft of the present invention (a is a side view, b is a cross-sectional view);

[0057] Figure 3Schematic diagram of the disassembly device for the present invention;

[0058] Figure 4 Schematic diagram of the pushing plate structure of the present invention;

[0059] Figure 5 Schematic diagram of the transfer case structure of the present invention (a is a sectional view, b is a front view);

[0060] Figure 6 Sectional view of the transfer case of the present invention at the input shaft assembly position;

[0061] Figure 7 Schematic diagram before disassembling the bearing of the present invention;

[0062] Figure 8 Schematic diagram during the process of disassembling the bearing of the present invention;

[0063] Figure 9 Schematic diagram after completing the disassembly of the bearing of the present invention.

[0064] Explanation of the attached drawing reference numerals: 1. Input shaft assembly, 2. Output shaft assembly one, 3. Output shaft assembly two, 4. Output shaft assembly three, 5. Output shaft assembly four, 6. Housing, 7. Input shaft gland assembly, 8. Input shaft blind cover assembly, 101. Input shaft, 102. Bearing one, 103. Retaining ring one, 104. Flat key, 105. Input gear, 106. Retaining ring two, 107. Bearing two, 101A. Groove one, 101B. Groove two, 901. L-shaped pull rod, 902. Pushing component, 903. Pushing plate, 903A. Card slot, 903B. Threaded hole, 904. Fastening component, 101a. First step, 101b. Second step, 101c. Third step, 101d. Annular groove.

[0065] It should be noted that these attached drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0066] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the attached drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0067] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0068] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] As Figure 1 shown, a bearing easily detachable input shaft assembly includes an input shaft 101, an input gear 105, a stop member, and bearings; the input shaft 101 is a stepped shaft, and the first step 101a is approximately located in the middle of the input shaft 101, dividing the input shaft 101 into a front half section area and a rear half section area. A spline or keyway is provided in the front half section area; the input gear 105 is sleeved on the middle position of the rear half section area of the input shaft 101, and the circumferential surfaces facing each other are circumferentially fixed through mounting and fixing components; the stop members are respectively mounted on the front and rear sides of the input gear 105 to achieve the axial fixation of the input gear 105 and the input shaft 101; bearing one 102 and bearing two 107 are respectively sleeved on the front and rear positions of the rear half section area of the input shaft 101, and there is an interference fit between bearing one 102, bearing two 107 and the input shaft; wherein, grooves one 101A and two 101B extending axially inward are provided at the positions where the input shaft 101 mounts bearing one 102 and bearing two 107, and the inward extension positions of the grooves straddle the bearing mounting positions arranged above; grooves one 101A and two 101B cooperate with the L-shaped pull rods inserted therein to pull the bearings, thereby realizing the disassembly of the bearings.

[0070] It should be noted that the above terms "input shaft" and "input gear" should be understood in a broad sense and can also be an output shaft and an output gear. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The following further describes the specific structure of the above input shaft.

[0072] As Figure 2As shown, the rear half of the input shaft 101 is divided into three areas: front, middle and rear by the second step 101b and the third step 101c, and the middle area protrudes from the front and rear areas; bearing 102 and bearing 2 107 are respectively mounted on the front area and the rear area in a tight fit manner, and the input gear 105 is mounted on the middle area.

[0073] Further solutions: Figure 2 As shown, groove 2 101B located below bearing 2 107 extends axially from the end face of the input shaft 101 to the end face of the third step 101c, and continues to extend radially for a distance on the end face of the third step 101c. At this time, the axial cross-section of groove 2 101B is a "﹂"-shaped structure; groove 1 101A located below bearing 1 102 extends axially from the end face of the first step 101a to the end face of the second step 101b, and continues to extend radially for a distance on the end face of the second step 101b. At this time, the axial cross-section of groove 101A is a mirror image structure of the "﹂"-shaped structure.

[0074] Preferred solution: Figure 2 As shown, the input shaft 101 located below the first bearing 102 and the second bearing 107 is provided with two grooves distributed along its circumference and 180 degrees apart.

[0075] Preferred solution: Figure 1 As shown, the fixing component is a flat key 104; an axial groove is arranged oppositely on the inner arc surface of the input gear 105 and the outer arc surface of the input shaft 101, and the flat key 104 is placed in the axial grooves arranged oppositely in the upper and lower directions.

[0076] It should be noted that the gear and the shaft are circumferentially connected using a single flat key in the present invention. Other alternatives include multiple flat keys, splines, etc.

[0077] Preferred solution: Figure 1 As shown, the stop component is an open retaining ring; the outer arc-shaped circumference of the input shaft is provided with an annular groove 101d on the front and rear sides of the axial groove, and the axial groove is connected to the annular grooves 101d on both sides; retaining ring 103 and retaining ring 2 106 are respectively inserted into the two annular grooves 101d, and retaining ring 103 and retaining ring 2 106 are fitted with the axial end face of the input gear 105 from the protruding parts of the annular groove 101d, thereby axially limiting the input gear 105 and the flat key 104.

[0078] It should be noted that according to the load-bearing and working modes of the inner and outer rings of the bearings, the input shaft 101 has an interference fit with both the first bearing 102 and the second bearing 107. Deep groove ball bearings are selected here, and radial rotation bearings such as spherical roller bearings can also be used as alternatives. The first retaining ring 103 and the second retaining ring 106 are elastic components. In this solution, shaft-type elastic retaining rings are used, which have the ability to automatically lock in the annular groove after being installed on the shaft.

[0079] For the axial limiting method of the gear and the shaft, the present invention is realized by two shaft-type elastic retaining rings. Other alternative methods include: shaft shoulder + elastic retaining ring, round nut, set screw, etc.

[0080] As Figure 3 shown, the present invention also provides a disassembly device for an easily detachable input shaft assembly of the above-mentioned bearings, including a push plate 903, an L-shaped pull rod 901, a fastening component 904, and a pushing component 902; symmetrically arranged clamping grooves 903A are provided at both ends of the push plate 903 in its length direction; the L-shaped pull rod 901 is arranged on both sides of the push plate 903, and the long arm of the L-shaped pull rod 901 is inserted into the corresponding clamping groove 903A. The width of the clamping groove 903A is slightly larger than the diameter of the long arm of the L-shaped pull rod 901 and allows the long arm of the L-shaped pull rod 901 to move easily in the U-shaped groove; the short arm of the L-shaped pull rod 901 can hook the bearing after extending into the root of the groove; the fastening component 904 is configured to fix and release the fixation between the L-shaped pull rod 901 and the push plate 903; the pushing component 902 is configured to apply a pressing force to the push plate 903 to move the push plate 903 away from the bearing, and then the push plate 903 drives the two L-shaped pull rods 901 to pull out the bearing.

[0081] A further solution, as Figure 3 shown, an external thread is provided on the long arm of the L-shaped pull rod 901; the fastening component 904 is composed of two nuts, and the two nuts are respectively sleeved on the long arms of the L-shaped pull rods 901 on both sides of the push plate 903. The fixation and release of the fixation between the L-shaped pull rod 901 and the push plate 903 are achieved by tightening the two nuts or loosening at least one nut.

[0082] A further solution, as Figure 4 shown, a circular convex platform and a threaded hole 903B located at the center of the circular convex platform are provided in the middle area of the push plate 903; when the pushing component 902 is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, it is positioned by the circular convex platform; when the pushing component 902 is a lead screw, the lead screw is screwed into the threaded hole 903B, and the circumferential rotation of the lead screw is converted into an axial linear motion.

[0083] As Figure 7 、 Figure 8 、 Figure 9As shown in the figure, the present invention also provides a disassembly method, which is implemented by using the above-mentioned disassembly device. The specific process is as follows: Insert two L-shaped pull rods 901 into the corresponding grooves. The short arm of the L-shaped pull rod 901 moves forward along the U-shaped cavity formed by the groove and the inner hole of the bearing. After the short arm of the L-shaped pull rod 901 enters the root of the groove, it can move radially away from the center position of the bearing. Place the pushing component 902 between the input shaft 101 and the pushing plate 903, and push the L-shaped pull rod 901 radially outward so that the short arm of the L-shaped pull rod 901 fits against the end face of the bearing inner ring near the shaft shoulder. Use the fastening component 904 to fix the L-shaped pull rod 901 and the pushing plate 903 together. The pushing component 902 pushes, and the two L-shaped pull rods 901 on both sides pull the bearing outward. When the inner ring of the bearing is separated from the input shaft 101, loosen the fastening component 904 and remove the bearing to complete the non-destructive disassembly of the bearing.

[0084] As can be seen from the above, in order to facilitate the maintenance of components such as gears and bearings and achieve non-destructive disassembly, the present invention designs a shaft with a special structure. Special grooves are provided at the outer circle of the bearing installation on the shaft, and the grooves are arranged across the width direction of the bearing. Use the L-shaped pull rod and the pushing component to pull and push the end face of the bearing inner ring from the groove, and the bearing can be easily and safely removed, greatly shortening the maintenance cycle of the disassembly operation of the bearing on the shaft and reducing the working intensity of maintenance workers.

[0085] As Figure 5 、 Figure 6 As shown in the figure, the present invention also provides a transfer case, which includes a housing 6, the above-mentioned input shaft assembly 1, output shaft assembly one 2, output shaft assembly two 3, output shaft assembly three 4, output shaft assembly four 5, input shaft through cover assembly 7, and input shaft blind cover assembly 8. The input shaft assembly 1 is installed in the housing 6, and the front half section of the input shaft 101 passes through the housing 6. The input shaft assembly 1 is radially positioned with the housing 6 through bearing one 102 and bearing two 107. The output gears in the output shaft assembly one 2, output shaft assembly two 3, output shaft assembly three 4, and output shaft assembly four 5 are all meshed with the input gear 105. The input shaft through cover assembly 7 is fixed on the housing 6 near the bearing two 107 through circumferential bolts to axially position the input shaft assembly 1. The input shaft blind cover assembly 8 is fixed on the housing 6 near the bearing one 102 through circumferential bolts to axially position the input shaft assembly 1.

[0086] As Figure 3As shown in the figure, the present invention also provides a disassembly device applied to the above transfer case, including a push plate 903, an L-shaped pull rod 901, a fastening component 904, and a pushing component 902; symmetrically arranged clamping grooves 903A are provided at both ends of the push plate 903 in its length direction; the L-shaped pull rod 901 is arranged on both sides of the push plate 903, and the long arm of the L-shaped pull rod 901 is inserted into the corresponding clamping groove 903A. The width of the clamping groove 903A is slightly larger than the diameter of the long arm of the L-shaped pull rod 901 and allows the long arm of the L-shaped pull rod 901 to move easily within the U-shaped groove; after the short arm of the L-shaped pull rod 901 extends into the root of the groove, it can hook the bearing; the fastening component 904 is configured to fix and release the fixation between the L-shaped pull rod 901 and the push plate 903; the pushing component 902 is configured to apply a pressing force to the push plate 903 to move the push plate 903 away from the bearing, and then the push plate 903 drives the two L-shaped pull rods 901 to pull out the bearing.

[0087] A further solution is as Figure 3 shown. External threads are provided on the long arm of the L-shaped pull rod 901; the fastening component 904 is composed of two nuts, and the two nuts are respectively sleeved on the long arms of the L-shaped pull rods 901 on both sides of the push plate 903. Fixation and release of the fixation between the L-shaped pull rod 901 and the push plate 903 are achieved by tightening the two nuts or loosening at least one nut.

[0088] A further solution is as Figure 4 shown. A circular convex platform and a threaded hole 903B located at the center of the circular convex platform are provided in the middle area of the push plate 903; when the pushing component 902 is any one of a hydraulic cylinder, a pneumatic cylinder, or an electric push rod, it is positioned by the circular convex platform; when the pushing component 902 is a lead screw, the lead screw is screwed into the threaded hole 903B, converting the circumferential rotation of the lead screw into an axial linear motion.

[0089] As Figure 7 、 Figure 8 、 Figure 9As shown in the figure, the present invention also provides a disassembly method, which is implemented by using the above-mentioned disassembly device. The specific process is as follows: Place the transfer case horizontally, keep the input shaft blind cover assembly 8 vertically upward, and remove the input shaft blind cover assembly 8; Vertically insert two L-shaped pull rods 901 from directly above into the corresponding grooves II 101B, and the short arms of the L-shaped pull rods 901 move forward along the U-shaped cavity formed by the grooves II 101B and the inner hole of the second bearing 107; After the short arms of the L-shaped pull rods 901 enter the root of the grooves II 101B, they can move radially away from the center position of the second bearing 107. Place the pushing component 902 between the input shaft 101 and the push plate 903, and push the L-shaped pull rods 901 radially outward so that the short arms of the L-shaped pull rods 901 are in contact with the shoulder end face of the inner ring of the second bearing 107. Use the fastening component 904 to fix the L-shaped pull rods 901 and the push plate 903 together; The pushing component 902 pushes, and the two L-shaped pull rods 901 on both sides pull the second bearing 107 outward. When the inner ring of the second bearing 107 is separated from the input shaft 101, loosen the fastening component 904 and remove the second bearing 107 to complete the non-destructive disassembly of the second bearing 107; After removing the second bearing 107, use conventional tools and disassembly methods to take out the second retaining ring 106, and the input gear 105 and the input shaft 101 can be disassembled and separated to achieve the non-destructive disassembly of the input gear 105; Flip the input shaft assembly 1 and repeat the above disassembly steps to achieve the non-destructive disassembly of the first bearing 102.

[0090] In summary, the present invention provides an input shaft assembly with easily detachable bearings, a disassembly device, a disassembly method, a transfer case, and a construction machinery. Obviously, after the implementation of the present invention, the non-destructive disassembly method using a hydraulic cylinder or a screw replaces the drilling-type destructive disassembly process, which will effectively reduce the disassembly difficulty and workload of the bearings, avoid potential faults in the transfer case caused by metal chips generated by drilling, and at the same time shorten the disassembly working hours; Most significantly, the bearings will not be damaged during the disassembly process, reducing the maintenance cost of the transfer case.

[0091] The construction machinery provided by the present invention will be described below. The construction machinery described below can be mutually corresponding and referred to the transfer case described above.

[0092] A construction machinery provided by the present invention may include a transfer case as described in any one of the above embodiments.

[0093] The beneficial effects achieved by the construction machinery provided by the present invention are consistent with the beneficial effects achieved by the transfer case provided by the present invention, so they will not be elaborated here.

[0094] It should be noted that the above construction machinery may be an excavator.

[0095] In the specification provided herein, a large number of specific details are set forth. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0096] In addition, those skilled in the art will understand that although some embodiments described herein include certain features contained in other embodiments but not others, combinations of features of different embodiments are equally within the scope of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0097] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content prompted above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A bearing easily detachable input shaft assembly, characterized in that, Comprising: An input shaft, which is a stepped shaft. The first step is roughly located at the middle position of the input shaft, dividing the input shaft into a front half region and a rear half region. A spline or keyway is provided in the front half region; An input gear, sleeved on the middle position of the rear half region of the input shaft. Circumferential fixation is achieved between the facing circumferential surfaces of the two through an installation fixing component; Stop components, respectively installed on the front and rear sides of the input gear to achieve axial fixation of the input gear and the input shaft; Bearings, respectively sleeved on the front and rear positions of the rear half region of the input shaft. An interference fit is provided between the bearings and the input shaft; Wherein, an axially inwardly extending groove is provided at the position where the input shaft installs the bearings, and the inward extension position of the groove straddles the bearing installation position arranged above; The groove cooperates with the L-shaped pull rod inserted therein to pull the bearing, thereby realizing the disassembly of the bearing.

2. The easily detachable input shaft assembly for bearings according to claim 1, wherein: The rear half region of the input shaft is divided into three regions: front, middle, and rear by a second step and a third step, and the middle region protrudes from the front and rear regions; The two bearings are respectively sleeved on the front region and the rear region in a tight fit manner, and the input gear is sleeved on the middle region.

3. The easily detachable input shaft assembly for bearings according to claim 2, wherein: The groove located below the rear bearing axially extends from the end face of the input shaft to the end face of the third step, and continues to radially extend a certain distance at the end face of the third step. At this time, the axial cross-section of the groove is a "﹂”-shaped structure; The groove located below the front bearing axially extends from the end face of the first step to the end face of the second step, and continues to radially extend a certain distance at the end face of the second step. At this time, the axial cross-section of the groove is a mirror image structure of the "﹂”-shaped structure.

4. The easily detachable input shaft assembly for bearings according to claim 1, wherein: Two grooves are respectively provided on the input shaft below the front bearing and the rear bearing, and are circumferentially distributed and spaced 180 degrees apart.

5. The easily detachable input shaft assembly for bearings according to claim 1, wherein: The fixing component is a flat key; An axially arranged groove is respectively provided on the inner arc circumferential surface of the input gear and the outer arc circumferential surface of the input shaft, and the flat key is placed in the axially arranged grooves arranged opposite to each other up and down.

6. The easily detachable input shaft assembly for bearings according to claim 5, wherein: The stop component is an open-type retaining ring; An annular groove is respectively provided on the outer arc circumferential surface of the input shaft on the front and rear sides of the axially arranged groove, and the axially arranged groove communicates with the annular grooves on both sides; The retaining rings are respectively snapped into the two annular grooves, and the protruding parts of the retaining rings from the annular grooves are attached to the axial end faces of the input gear to axially limit the input gear and the flat key.

7. A disassembling device for the easily disassembled input shaft assembly of the bearing according to any one of claims 1 to 6, characterized in that, Comprising: A push plate, with a symmetrically arranged card slot provided at each of the two ends in its length direction; An L-shaped pull rod, arranged on both sides of the push plate. The long arm of the L-shaped pull rod is inserted into the corresponding card slot, and the short arm of the L-shaped pull rod can hook the bearing after extending into the root of the groove. A fastening component, configured to fix and unfix between the L-shaped pull rod and the pushing plate; A pushing component, configured to apply a pressing force to the pushing plate, move the pushing plate away from the bearing, and then the pushing plate drives the two L-shaped pull rods to pull out the bearing.

8. The dismounting device according to claim 7, characterized in that: External threads are provided on the long arms of the L-shaped pull rods; the fastening component consists of two nuts, and the two nuts are respectively sleeved on the long arms of the L-shaped pull rods on both sides of the pushing plate, and the fixing and unfixing between the L-shaped pull rod and the pushing plate are realized by tightening the two nuts or loosening at least one nut.

9. The dismounting device according to claim 7, characterized in that: A circular convex platform and a threaded hole located at the center of the circular convex platform are provided in the middle area of the pushing plate; When the pushing component is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, it is positioned by the circular convex platform; When the pushing component is a lead screw, the lead screw is screwed into the threaded hole, and the circumferential rotation of the lead screw is converted into an axial linear motion.

10. A dismounting method, characterized in that: It is implemented by using the dismounting device described in claims 7 to 9; Insert the two L-shaped pull rods into the corresponding grooves, and the short arms of the L-shaped pull rods move forward along the U-shaped cavity formed by the grooves and the inner hole of the bearing; After the short arms of the L-shaped pull rods enter the roots of the grooves, they can move radially away from the center position of the bearing. Place the pushing component between the input shaft and the pushing plate, push the L-shaped pull rods radially outward, make the short arms of the L-shaped pull rods fit against the shoulder end face of the inner ring of the bearing, and use the fastening component to fix the L-shaped pull rods and the pushing plate together; The pushing component makes a push, and the two L-shaped pull rods on both sides pull the bearing outward. When the inner ring of the bearing is separated from the input shaft, loosen the fastening component, remove the bearing, and complete the non-destructive disassembly of the bearing.

11. A transfer case, characterized in that, Including: A housing; The bearing easily detachable input shaft assembly according to any one of claims 1 to 6, which is installed in the housing, and the front half section of the input shaft passes through the housing; the input shaft assembly realizes radial positioning with the housing through the bearings on both sides; Multiple output shaft assemblies, and the output gears in each output shaft assembly are engaged with the input gears; An input shaft gland assembly, which is fixed on the housing near the rear half section of the input shaft through circumferential bolts to axially position the input shaft assembly; An input shaft blind cover assembly, which is fixed on the housing near the rear half section of the input shaft through circumferential bolts to axially position the input shaft assembly.

12. A disassembling device applied to the transfer case described in claim 11, characterized in that, Including: A pushing plate, with a symmetrically arranged card slot at each end in its length direction; L-shaped pull rods, arranged on both sides of the pushing plate, the long arms of the L-shaped pull rods are inserted into the corresponding card slots, and the short arms of the L-shaped pull rods can hook the bearing after extending into the roots of the grooves; A fastening component, configured to fix and unfix between the L-shaped pull rod and the pushing plate; A pushing component, configured to apply a pressing force to the pushing plate, move the pushing plate away from the bearing, and then the pushing plate drives the two L-shaped pull rods to pull out the bearing.

13. The dismounting device according to claim 12, characterized in that: The long arm of the L-shaped pull rod is provided with an external thread; the fastening component is composed of two nuts, and the two nuts are respectively sleeved on the long arms of the L-shaped pull rods on both sides of the push plate, and the fixation and release of the fixation between the L-shaped pull rod and the push plate are realized by tightening the two nuts or loosening at least one nut.

14. The disassembly device according to claim 12, characterized in that: A circular convex platform and a threaded hole located at the center of the circular convex platform are provided in the middle area of the push plate; When the pushing component is any one of a hydraulic cylinder, a pneumatic cylinder or an electric push rod, it is positioned by the circular convex platform; When the pushing component is a lead screw, the lead screw is screwed into the threaded hole, and the circumferential rotation of the lead screw is converted into an axial linear motion.

15. A disassembly method, characterized in that: It is implemented by using the disassembly device according to any one of claims 12 to 14; Place the transfer case horizontally, keep the input shaft gland assembly vertically upward, and remove the input shaft gland assembly; Vertically insert two L-shaped pull rods from directly above into the corresponding grooves, and the short arms of the L-shaped pull rods move forward along the U-shaped cavity formed by the grooves and the inner hole of the bearing; After the short arm of the L-shaped pull rod enters the root of the groove, it can move radially away from the center position of the bearing. Place the pushing component between the input shaft and the push plate, push the L-shaped pull rod radially outward, so that the short arm of the L-shaped pull rod fits against the shoulder end face of the inner ring of the bearing, and use the fastening component to fix the L-shaped pull rod and the push plate together; The pushing component performs pushing, and the two L-shaped pull rods on both sides pull the bearing outward. When the inner ring of the bearing is separated from the input shaft, loosen the fastening component, remove the bearing, and complete the non-destructive disassembly of the bearing; After removing the bearing, take out the stop component adjacent to the bearing, and the input gear and the input shaft can be disassembled and separated to realize the non-destructive disassembly of the input gear; Flip the input shaft assembly and repeat the above disassembly steps to realize the non-destructive disassembly of the other bearing.

16. An engineering machinery, characterized in that: It includes the bearing easily detachable input shaft assembly according to any one of claims 1 to 6; or, it includes the transfer case according to claim 11.

Images