Output gear shaft structure easy to disassemble, rotary speed reducer and excavator

Abstract

The invention discloses an output gear shaft structure easy to disassemble, a rotary speed reducer and an excavator, and the output gear shaft structure comprises an output gear shaft which is provided with a first pressure oil way and a second pressure oil way; the bearing assembly is detachably installed on the output gear shaft, the bearing assembly comprises a second seal, a second bearing, a movable bearing retaining shoulder and a first bearing which are sequentially installed on the output gear shaft, a first seal is installed on the movable bearing retaining shoulder, the first pressure oil way is used for providing radial tension for the first bearing, and the second pressure oil way is used for providing radial tension for the second bearing. The second pressure oil way is used for providing radial tension for the second bearing. According to the output gear shaft structure easy to disassemble, the output gear shaft of the rotary speed reducer and the bearing on the output gear shaft can be quickly disassembled, the overhaul period of maintenance work related to disassembly and assembly of the output gear shaft and the bearing on the output gear shaft is greatly shortened, and the working intensity of maintenance workers is reduced.

Description

Technical Field

[0001] The invention relates to an easily disassembled output gear shaft structure, a rotary reducer and an excavator, and belongs to the field of engineering machinery reducers. Background Art

[0002] The output gear shaft of the rotary reducer generally adopts a pair of spherical roller bearings or a pair of tapered roller bearings. The inner hole of the bearing and the output gear shaft adopt an interference fit, the outer circle of the bearing and the housing (bearing seat) are small clearance fits, and the two bearings are distributed at both ends of the housing shoulder; the bearing is pressed on the shaft with a retaining ring or a round nut; the output gear shaft adopts a solid structure.

[0003] When the output gear shaft or the bearing thereon is damaged, the prime mover and the reduction device need to be removed. Generally, a press is used to press the output gear shaft out of the housing, or a hammer is used to knock it out. It is very inconvenient to remove the output gear shaft and the bearing thereon. At the same time, the disassembly process is likely to damage the bearing retainer and tear the outer diameter surface of the shaft diameter. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides an easily disassembled output gear shaft structure, a slewing reducer and an excavator, which have the basic functions of a slewing reducer and at the same time have the function of simply and quickly disassembling the output gear shaft and the bearings thereon, and can greatly shorten the disassembly and assembly cycle of the output gear shaft and the bearings thereon.

[0005] In order to achieve the above object, the present invention adopts an easily detachable output gear shaft structure, comprising:

[0006] An output gear shaft, on which a first pressure oil circuit and a second pressure oil circuit are provided;

[0007] A bearing assembly is detachably mounted on the output gear shaft, and the bearing assembly includes a second seal, a second bearing, a movable bearing shoulder and a first bearing which are sequentially mounted on the output gear shaft, the first seal is mounted on the movable bearing shoulder, the first pressure oil circuit is used to provide radial tension for the first bearing, and the second pressure oil circuit is used to provide radial tension for the second bearing.

[0008] In some embodiments, the first and second pressure oil circuits each include a threaded hole, an axial oil hole, a radial oil hole and an oil groove that are connected in sequence, the threaded hole is arranged at the end of the axial oil hole and the two are connected, the tail of the axial oil hole is connected to the radial oil hole, and the oil groove is connected to the end of the radial oil hole and cooperates with the inner ring of the bearing.

[0009] In some embodiments, a sealing shoulder is provided on the movable bearing shoulder, and a sealing shaft diameter and a shoulder seat for limiting the sealing shoulder are provided on the output gear shaft;

[0010] The outer circumferential surface of the sealing shaft diameter is connected to the first seal and the outer circumferential diameter of the sealing shaft diameter is smaller than the inner hole diameter of the sealing shoulder. The outer circumferential diameter of the shoulder seat is larger than the inner hole diameter of the sealing shoulder.

[0011] In some embodiments, a bearing clamp is installed on the first bearing through a plug.

[0012] In some embodiments, a housing is also included, which is installed on the outer rings of the second bearing and the first bearing, and the housing is connected to the movable bearing shoulder through a fixing member.

[0013] In some embodiments, fixing holes are arranged circumferentially on the movable bearing shoulder.

[0014] A second aspect of the present invention provides a rotary reducer, comprising a prime mover and a reduction device connected to the prime mover, wherein the reduction device is connected to the easily detachable output gear shaft structure.

[0015] In some embodiments, the prime mover is a hydraulic motor or an electric motor, and the reduction device is a multi-stage planetary reduction structure or a multi-stage parallel reduction mechanism;

[0016] The prime mover is connected to the input end of the reduction device, and the output end of the reduction device is connected to the output gear shaft.

[0017] A third aspect of the present invention provides an excavator, on which the slewing reducer is installed.

[0018] A fourth aspect of the present invention provides a method for disassembling the easily disassembled output gear shaft structure, comprising the steps of:

[0019] Connect the high-pressure oil to the first pressure oil circuit. The high-pressure oil will slightly separate the inner ring of the first bearing from the outer diameter of the output gear shaft. At this time, remove the first bearing.

[0020] Remove the movable bearing shoulder and the first seal;

[0021] Connect the high-pressure oil to the second pressure oil circuit. The high-pressure oil slightly separates the inner ring of the second bearing from the outer diameter of the output gear shaft. At this time, remove the second bearing and the second seal.

[0022] At this point, the removal of the output gear shaft and its bearing assembly is completed.

[0023] Compared with the prior art, the easily disassembled output gear shaft structure of the present invention can realize the rapid disassembly of the output gear shaft of the rotary reducer and the bearing thereon, greatly shortening the maintenance cycle involving the disassembly and assembly of the output gear shaft and the bearing thereon, and reducing the workload of maintenance workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of the rotary reducer of the present invention;

[0026] Figure 2 is a schematic diagram of the output gear shaft structure of the present invention (the housing is not shown);

[0027] Figure 3 An exploded view of the output gear shaft structure of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the housing of the present invention; (a) is a cross-sectional view, and (b) is a main view;

[0029] Figure 5 It is a schematic diagram of the structure of the movable bearing shoulder of the present invention; (a) is a cross-sectional view, and (b) is a main view;

[0030] Figure 6 Schematic diagram of the structure of the pressure oil circuit on the output gear shaft of the present invention; (a) the first pressure oil circuit, (b) the second pressure oil circuit;

[0031] Figure 7 This is a schematic diagram of the pressure disassembly of the output gear shaft of the existing rotary reducer and the bearing force;

[0032] Figure 8 This is a schematic diagram of disassembling the bearing on the output gear shaft of the present invention;

[0033] Fig. 9 The structure diagram of the output gear shaft and the bearing arrangement of the existing rotary reducer;

[0034] In the figure: 1. prime mover; 2. reduction gear; 3. fixing part; 4. housing, 401, through hole, 402, second bearing shoulder; 5. plug; 6. first bearing; 7. movable bearing shoulder, 701, fixing hole, 702, sealing disassembly hole, 703, sealing shoulder; 8. second bearing; 9. output gear shaft, 901, first threaded hole, 902, first axial oil hole, 903, first radial oil hole, 904, first oil groove, 905, second threaded hole, 906, second axial oil hole, 907, sealing shaft diameter, 908, shoulder seat, 909, second radial oil hole, 910, second oil groove; 10. bearing clamp; 11. first seal; 12. second seal.

[0035] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below with the help of accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Combination Figure 1-Figure 9 As shown, an easily disassembled output gear shaft structure includes an output gear shaft 9 and a bearing assembly;

[0039] The output gear shaft 9 is provided with a first pressure oil circuit and a second pressure oil circuit;

[0040] The bearing assembly is detachably mounted on the output gear shaft 9, and the bearing assembly comprises a second seal 12, a second bearing 8, a movable bearing shoulder 7 and a first bearing 6 which are sequentially mounted on the output gear shaft 9, a first seal 11 is mounted on the movable bearing shoulder 7, the first pressure oil circuit is used to provide radial tension for the first bearing 6, and the second pressure oil circuit is used to provide radial tension for the second bearing 8. The output gear shaft structure of the present invention can be disassembled as a whole, and the problem of inner and outer ring force during bearing disassembly is solved by the movable bearing shoulder 7, so that the bearing assembly can be disassembled quickly and safely without damaging the bearing, and special tools such as a press are not required, which reduces the difficulty of work.

[0041] In some embodiments, Figure 6 As shown, the first pressure oil circuit includes a first threaded hole 901, a first axial oil hole 902, a first radial oil hole 903 and a first oil groove 904, the first threaded hole 901 is arranged at the end of the first axial oil hole 902 and the two are connected, the tail of the first axial oil hole 902 is connected to the first radial oil hole 903, and the first oil groove 904 is distributed at the end of the first radial oil hole 903 and cooperates with the inner ring of the first bearing 6;

[0042] like Figure 6 As shown, the second pressure oil circuit includes a second threaded hole 905, a second axial oil hole 906, a second radial oil hole 909, and a second oil groove 910. The second threaded hole 905 is arranged at the end of the second axial oil hole 906 and the two are connected. The tail of the second axial oil hole 906 is connected to the second radial oil hole 909. The second oil groove 910 is distributed at the end of the second radial oil hole 909 and cooperates with the inner ring of the second bearing 8.

[0043] It should be noted that if Figure 2 As shown, the present invention utilizes a pressure oil circuit composed of an axial oil hole, a radial oil hole and an oil groove, and uses high-pressure oil to support the inner ring of the bearing away from the outer cylindrical surface of the shaft diameter of the output gear shaft 9, thereby converting the interference fit into a clearance fit or a small interference fit, thereby facilitating the removal of the bearing and protecting the outer cylindrical surface of the shaft diameter and the bearing.

[0044] In some embodiments, Figure 5 , Figure 6 As shown, the movable bearing shoulder 7 is provided with a sealing shoulder 703, the output gear shaft 9 is provided with a sealing shaft diameter 907 for installing the first seal 11, and a shoulder seat 908 for limiting the sealing shoulder 703;

[0045] The outer cylindrical surface of the sealing shaft diameter 907 is connected to the first seal 11 and the outer cylindrical diameter of the sealing shaft diameter 907 is smaller than the inner hole diameter of the sealing shoulder 703. The outer cylindrical diameter of the shoulder seat 908 is larger than the inner hole diameter of the sealing shoulder 703, ensuring that the movable bearing shoulder 7 can be smoothly installed on the output gear shaft 9 and limited by the shoulder seat 908; a 2-5mm gap is provided between the end face of the movable bearing shoulder 7 close to the first bearing 6 and the end face of the first bearing 6, ensuring that the axial position of the bearing can be correctly positioned.

[0046] In some embodiments, Figure 3 As shown, a bearing clamp 10 is installed on the first bearing 6 through a plug 5. It should be noted that the size specifications of the first threaded hole 901 and the second threaded hole 905 are preferably consistent. The plug 5 is installed in the first threaded hole 901 and the second threaded hole 905 to prevent impurities such as iron filings from entering the first and second pressure oil circuits.

[0047] In some embodiments, Figure 3 , Figure 4 As shown, it also includes a housing 4 installed on the second bearing 8 and the outer ring of the first bearing 6, and the housing 4 is connected to the movable bearing shoulder 7 through a fixing member 3. Figure 4As shown, the movable bearing shoulder 7 is provided with a plurality of fixing holes 701 evenly arranged along the circumferential direction, the shell 4 is provided with a plurality of through holes 401 cooperating with the fixing holes 701, the fixing member 3 enters the through hole 401 from the left side of the shell 4, and is connected with the fixing hole 701, thereby connecting the movable bearing shoulder 7 with the shell 4.

[0048] The second aspect of the present invention, as Figure 1 As shown, a rotary reducer is also provided, comprising a prime mover 1, and a reduction device 2 connected to the prime mover 1, wherein the reduction device 2 is connected to the easily detachable output gear shaft structure.

[0049] In some embodiments, the prime mover 1 is generally a hydraulic motor, but may also be an electric motor. The prime mover 1 and the input end of the reduction gear 2 are connected in a non-rotatable manner;

[0050] The deceleration device 2 can be a multi-stage planetary deceleration structure or a multi-stage parallel deceleration mechanism. The output end of the deceleration device 2 and the output gear shaft 9 are connected in a non-circumferentially rotatable manner.

[0051] According to a third aspect of the present invention, there is also provided an excavator, on which the slewing reducer is installed.

[0052] When assembling for the first time, refer to Figure 1 , Figure 2 and Figure 7 , first assemble the first seal 11 to the corresponding position of the movable bearing shoulder 7, then assemble the second seal 12, the second bearing 8, the movable bearing shoulder 7, the first bearing 6, the bearing clamp 10, and the plug 5 from the small end to the output gear shaft 9 in sequence, and then place the output gear shaft 9 vertically with the gear end face at the bottom;

[0053] refer to Figure 5 and Figure 6 Since the inner diameter of the sealing shoulder 703 of the movable bearing shoulder 7 is slightly larger than the sealing shaft diameter 907, and the inner diameter of the sealing shoulder 703 is smaller than the outer diameter of the shoulder seat 908, the movable bearing shoulder 7 will be pressed on the end surface of the shoulder seat 908 after assembly; under the action of the first seal 11, the movable bearing shoulder 7 and the output gear shaft 9 temporarily become an assembly;

[0054] refer to Figure 4 , Figure 5 , insert the housing 4 into the assembly of the output gear shaft 9 from the top, the aperture of the second bearing shoulder 402 on the housing 4 is larger than the outer diameter of the movable bearing shoulder 7, so that the housing 4 can easily pass through the movable bearing shoulder 7; when the end face of the second bearing shoulder 402 of the housing 4 fits with the end face of the second bearing 8, a gap of 2-5mm should be ensured between the movable bearing shoulder 7 and the housing 4.

[0055] refer to Figure 4 and Figure 5 , rotate the housing 4 until any through hole 401 of the housing 4 is coaxial with a fixed hole 701 on the movable bearing shoulder 7, install the fixing part 3 to complete the assembly of the output gear shaft structure; install the reduction device 2 and the prime mover 1 to complete the assembly of the rotary reducer.

[0056] When disassembling the first bearing 6 or the second bearing 8, place the prime mover 1 of the rotary reducer downward, remove the fixing bolts of the outer ring of the housing 4, and remove the components except the prime mover 1 and the reduction gear 2; remove the fixing member 3, and then remove the housing 4 from the outer ring of the bearing;

[0057] refer to Figure 1 , remove the plug 5 and the bearing clamp 10;

[0058] refer to Figure 6 , connect the high-pressure oil to the first threaded hole 901, apply pressure to the oil, and the oil passes through the first axial oil hole 902 and the first radial oil hole 903 to the first oil groove 904. The high-pressure oil slightly separates the inner ring of the first bearing 6 from the outer diameter of the output gear shaft 9. At this time, the first bearing 6 can be easily removed;

[0059] refer to Figure 1 and Figure 5 , remove the movable bearing shoulder 7 and the first seal 11. If the seal needs to be replaced, the first seal 11 can be removed through the seal removal hole 702 on the movable bearing shoulder 7;

[0060] refer to Figure 6 , Figure 8 , connect the high-pressure oil to the second threaded hole 905, apply pressure to the oil, and the oil passes through the second axial oil hole 906 and the second radial oil hole 909 to the second oil groove 910. The oil in the second oil groove 910 slightly separates the inner ring of the second bearing 8 from the outer diameter of the output gear shaft 9, and the second bearing 8 is removed;

[0061] At this point, the removal of the output gear shaft 9 and the bearing assembly thereon is completed.

[0062] refer to Figure 7 , Fig. 9 , the conventional disassembly of the output gear shaft 9 and its bearing is to use a press to apply pressure to the upper end face of the output gear shaft 9, and the pressure is transmitted to the housing 4 from the first bearing inner ring, the first bearing retainer, and the first bearing outer ring in sequence. This disassembly method is very likely to damage the first bearing 6 and reduce the bearing life value; when disassembling the second bearing 8, the tooling is supported on the inner ring end face of the second bearing 8, and the output gear shaft 9 is pressed by a press, which is likely to cause the gear shaft diameter to be stretched, or a puller is used to remove it through the bearing outer ring, which is also likely to damage the bearing retainer and reduce the bearing life.

[0063] Obviously, after the implementation of the present invention, the press equipment is replaced by the bolt disassembly and assembly process, and the interference between the bearing and the shaft diameter is reduced by the support of hydraulic oil, which will effectively reduce the difficulty and workload of disassembling the output gear shaft of the rotary reducer and the bearings thereon, reduce equipment investment, and shorten disassembly working hours; at the same time, the bearing will not be damaged during the disassembly process, reducing equipment maintenance costs.

[0064] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0065] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming 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.

[0066] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. An easily disassembled output gear shaft structure, characterized in that: include: An output gear shaft (9) is provided with a first pressure oil circuit and a second pressure oil circuit; A bearing assembly is detachably mounted on the output gear shaft (9), the bearing assembly comprising a second seal (12), a second bearing (8), a movable bearing shoulder (7) and a first bearing (6) which are sequentially mounted on the output gear shaft (9), the movable bearing shoulder (7) being mounted with a first seal (11), the first pressure oil circuit being used to provide radial tension for the first bearing (6), and the second pressure oil circuit being used to provide radial tension for the second bearing (8).

2. The easily detachable output gear shaft structure according to claim 1, characterized in that: The first and second pressure oil circuits both include a threaded hole, an axial oil hole, a radial oil hole and an oil groove which are connected in sequence. The threaded hole is arranged at the end of the axial oil hole and the two are connected. The tail of the axial oil hole is connected to the radial oil hole. The oil groove is connected to the end of the radial oil hole and cooperates with the inner ring of the bearing.

3. The easily detachable output gear shaft structure according to claim 1, characterized in that: The movable bearing shoulder (7) is provided with a sealing shoulder (703), and the output gear shaft (9) is provided with a sealing shaft diameter (907) and a shoulder seat (908) for limiting the position of the sealing shoulder (703); The outer circumferential surface of the sealing shaft diameter (907) is connected to the first seal (11) and the outer circumferential diameter of the sealing shaft diameter (907) is smaller than the inner hole diameter of the sealing shoulder (703), and the outer circumferential diameter of the shoulder seat (908) is larger than the inner hole diameter of the sealing shoulder (703).

4. The easily detachable output gear shaft structure according to claim 1, characterized in that: A bearing pressing member (10) is installed on the first bearing (6) via a plug (5).

5. The easily detachable output gear shaft structure according to claim 1, characterized in that: It also includes a housing (4), which is mounted on the outer rings of the second bearing (8) and the first bearing (6), and the housing (4) is connected to the movable bearing shoulder (7) via a fixing member (3).

6. The easily detachable output gear shaft structure according to claim 5, characterized in that: The movable bearing shoulder (7) is provided with fixing holes (701) arranged along the circumferential direction.

7. A rotary reducer, comprising a prime mover (1), and a reduction device (2) connected to the prime mover (1), characterized in that: The reduction gear (2) is connected to the easily detachable output gear shaft structure according to any one of claims 1 to 6.

8. A rotary reducer according to claim 7, characterized in that: The prime mover (1) is a hydraulic motor or an electric motor, and the reduction device (2) is a multi-stage planetary reduction structure or a multi-stage parallel reduction mechanism; The prime mover (1) is connected to the input end of the reduction device (2), and the output end of the reduction device (2) is connected to the output gear shaft (9).

9. An excavator, characterized in that: The excavator is equipped with the slewing reducer according to claim 7 or 8.

10. A method for disassembling the easily disassembled output gear shaft structure according to any one of claims 1 to 6, characterized in that: Includes steps: Connect high-pressure oil to the first pressure oil circuit, and the high-pressure oil slightly separates the inner ring of the first bearing (6) from the outer diameter surface of the output gear shaft (9), and then remove the first bearing (6); Remove the movable bearing shoulder (7) and the first seal (11); Connect high-pressure oil to the second pressure oil circuit. The high-pressure oil slightly separates the inner ring of the second bearing (8) from the outer diameter surface of the output gear shaft (9). At this time, the second bearing (8) and the second seal (12) are disassembled. At this point, the removal of the output gear shaft (9) and the bearing assembly thereon is completed.

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