Base assembly for speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a base assembly for a speed reducer, which comprises a shell, a gear shaft and a framework oil seal, a first mounting cavity, a second mounting cavity and a third mounting cavity are sequentially formed in the shell, and the inner diameter of the second mounting cavity is smaller than that of the first mounting cavity and that of the third mounting cavity; the gear shaft is provided with a first circular truncated cone, a second circular truncated cone, a third circular truncated cone and a fourth circular truncated cone of which the diameters are sequentially reduced, and the second circular truncated cone is sleeved with a first bearing which is embedded in the first mounting cavity; the third circular truncated cone is sleeved with a framework oil seal, and the framework oil seal is embedded into the second installation cavity. The fourth circular truncated cone is sleeved with a second bearing, and the second bearing is embedded into the third mounting cavity. The first circular truncated cone abuts against the first bearing, a limiting piece is detachably arranged on the side, away from the first bearing, of the second bearing, and the limiting piece abuts against the second bearing. The base assembly solves the problems that a base assembly of a traditional rotary speed reducer is complex in structure, slow to assemble and disassemble and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, and in particular to a base assembly for a reducer. Background Art

[0002] The traditional slewing reducer base assembly mainly includes a housing and a gear shaft. One end of the gear shaft is connected to the output end of the slewing reducer, and the other end of the gear shaft is connected to the input end of the driven system. The gear shaft is rotatably set on the housing through multiple bearings and sleeves, and is composed of multiple wire retaining rings and limit sleeves, so that the gear shaft is stably rotated and set on the housing. The system structure is complex and the reliability is not high. In particular, the wire retaining ring is difficult to assemble and disassemble. The number of wire retaining ring grooves corresponding to the sleeve, limit sleeve, gear shaft and housing is large and the processing is difficult. Therefore, the production of the traditional slewing reducer base assembly has problems such as complex structure, slow assembly and disassembly due to the large number of components. Utility Model Content

[0003] The purpose of the utility model is to provide a base assembly for a reducer, which solves the problems of the traditional rotary reducer's base assembly having a complex structure and being slow to assemble and disassemble.

[0004] The utility model is implemented through the following technical solutions: a base assembly for a reducer, comprising a housing, a gear shaft and a skeleton oil seal, wherein a first mounting cavity, a second mounting cavity and a third mounting cavity are sequentially defined in the housing, and the inner diameter of the second mounting cavity is smaller than the inner diameters of the first mounting cavity and the third mounting cavity;

[0005] The gear shaft is provided with a first frustum, a second frustum, a third frustum and a fourth frustum of successively decreasing diameters; the second frustum is sleeved with a first bearing, which is embedded in the first mounting cavity; the third frustum is sleeved with the skeleton oil seal, which is embedded in the second mounting cavity; the fourth frustum is sleeved with a second bearing, which is embedded in the third mounting cavity;

[0006] The first truncated cone abuts against the first bearing, and a detachable limiting member is provided on a side of the second bearing away from the first bearing, and the limiting member abuts against the second bearing.

[0007] Furthermore, a fifth frustum is provided on a side of the fourth frustum away from the third frustum, the diameter of the fifth frustum is smaller than the diameter of the fourth frustum, and the limiting member is provided on the fifth frustum.

[0008] Furthermore, the limiting member is a retaining spring, a limiting groove is provided on the fifth circular platform, and the retaining spring is provided in the limiting groove.

[0009] Furthermore, the limiting member is sleeved on the fifth truncated table, and the limiting member is threadedly engaged with the fifth truncated table.

[0010] Furthermore, the limiting member is sleeved on the fifth truncated cone, and a plurality of locking holes are arranged in a circumferential array on the fifth truncated cone. The locking holes are arranged radially, and a locking pin is threadedly connected to the locking hole. The part of the locking pin located outside the locking hole abuts against the side of the limiting member away from the second bearing.

[0011] Furthermore, the first bearing and the second bearing are both spherical roller bearings.

[0012] Furthermore, the first circular platform is sleeved with a first gear, and the fifth circular platform is sleeved with a second gear.

[0013] Furthermore, a dust cover is provided on the second truncated platform, and the dust cover is located between the first truncated platform and the first bearing.

[0014] The technical solution of the utility model has at least the following advantages and beneficial effects:

[0015] Since the inner diameter of the second mounting cavity is smaller than the inner diameters of the first mounting cavity and the third mounting cavity, when the first frustum abuts against the first bearing, the limit member abuts against the side of the second bearing away from the first bearing, so that the first bearing and the second bearing are clamped on both sides of the second mounting cavity, ensuring the rotation basis of the gear shaft while preventing the gear shaft from separating from the housing. The overall structure is simple, and installation and disassembly are very convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of a base assembly for a reducer provided by the utility model;

[0018] Figure 2 The utility model provides a reducer base assembly embodiment 1 located at Figure 1 A magnified schematic diagram of the structure at A in the middle;

[0019] Figure 3 The second embodiment of the base assembly for a reducer provided by the utility model is located at Figure 1 A magnified schematic diagram of the structure at A in the middle;

[0020] Figure 4 The third embodiment of the base assembly for a reducer provided by the utility model is located at Figure 1 A magnified schematic diagram of the structure at A in the middle;

[0021] Icons: 1. Housing, 11. First mounting cavity, 12. Second mounting cavity, 13. Third mounting cavity, 2. Gear shaft, 21. First frustum, 22. Second frustum, 23. Third frustum, 24. Fourth frustum, 25. Fifth frustum, 26. Limiting groove, 27. Locking hole, 28. Locking pin, 3. Skeleton oil seal, 4. First bearing, 5. Second bearing, 6. Limiting piece, 7. First gear, 8. Second gear, 9. Dust cover. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] Example 1:

[0025] Reference Figures 1 to 2 As shown, this embodiment provides a base assembly for a reducer, including a housing 1, a gear shaft 2, and a skeleton oil seal 3. The upper end of the housing 1 is connected to the planetary reducer by bolts, and the lower end of the housing 1 is connected to the base to be installed by bolts. A first installation cavity 11, a second installation cavity 12, and a third installation cavity 13 are sequentially defined in the housing 1. The inner diameter of the second installation cavity 12 is smaller than the inner diameters of the first installation cavity 11 and the third installation cavity 13.

[0026] More specifically, Figure 1 and 2As shown, the gear shaft 2 is provided with a first cone 21, a second cone 22, a third cone 23 and a fourth cone 24 with decreasing diameters in sequence. The second cone 22 is provided with a first bearing 4, and the first bearing 4 is embedded in the first mounting cavity 11; the third cone 23 is provided with a skeleton oil seal 3, and the skeleton oil seal 3 is embedded in the second mounting cavity 12; the fourth cone 24 is provided with a second bearing 5, and the second bearing 5 is embedded in the third mounting cavity 13. The second cone 22 is also provided with a dust cover 9, which is located between the first cone 21 and the first bearing 4. The dust cover 9 is clearance-matched with the inner wall of the first mounting cavity 11 to prevent dust from entering the first bearing 4, and at the same time cooperates with the first cone 21 to limit the first bearing 4.

[0027] When implementing it specifically, Figure 1 and 2 As shown, the first cone 21 abuts against the first bearing 4, and a limiting member 6 is provided on the side of the second bearing 5 away from the first bearing 4. The limiting member 6 abuts against the second bearing 5, and then a limiting section is formed on the gear shaft 2 through the first cone 21 and the limiting member 6. During installation, the dust cover 9 and the first bearing 4 are first sleeved on the second cone 22, and then the thinnest end of the gear shaft 2 is passed through the first mounting cavity 11, the second mounting cavity 12 and the third mounting cavity 13 in the outer shell 1 in sequence until the first bearing 4 and the first mounting cavity 11 are installed in place, and then the skeleton oil seal 3 is installed in the second mounting cavity 12 from the other side. The second mounting cavity 12 is provided with a stepped portion, which can limit the skeleton oil seal 3. After the skeleton oil seal 3 is installed, the second bearing 5 can be installed in the third mounting cavity 13, and finally the limiting member 6 is installed.

[0028] Since the inner diameter of the second mounting cavity 12 is smaller than the inner diameters of the first mounting cavity 11 and the third mounting cavity 13, when the first truncated cone 21 abuts against the first bearing 4, the limit member 6 abuts against the side of the second bearing 5 away from the first bearing 4, so that the first bearing 4 and the second bearing 5 are clamped on both sides of the second mounting cavity 12, ensuring the rotation basis of the gear shaft 2 while preventing the gear shaft 2 from separating from the housing 1. The overall structure is simple, and installation and disassembly are very convenient and quick.

[0029] More specifically, Figure 1 As shown, both the first bearing 4 and the second bearing 5 are spherical roller bearings. These bearings feature double-row rollers, a single shared spherical raceway on the outer ring, and two raceways on the inner ring, tilted at an angle relative to the bearing axis. This ingenious design provides self-aligning performance, making it less susceptible to angular errors between the shaft and the bearing housing, or to shaft bending. This makes it suitable for applications where angular errors due to installation errors or shaft deflection can occur. In addition to supporting radial loads, these bearings can also withstand bidirectional axial loads, ensuring the structural strength required for the rotation of the gear shaft 2.

[0030] like Figure 1 As shown, the first truncated cone 21 is sleeved with a first gear 7, which is an output gear. The fifth truncated cone 25 is sleeved with a second gear 8, which serves as a sun gear at the output end of the planetary reducer.

[0031] A fifth truncated cone 25 is further provided on a side of the fourth truncated cone 24 away from the third truncated cone 23 . The diameter of the fifth truncated cone 25 is smaller than that of the fourth truncated cone 24 . The limiting member 6 is provided on the fifth truncated cone 25 .

[0032] When implementing it specifically, Figure 1 and 2 As shown, the limiting member 6 is a retaining spring, and a limiting groove 26 is provided on the fifth truncated cone 25. The retaining spring is disposed in the limiting groove 26. The retaining spring is sleeved in the limiting groove 26, thereby fixing the retaining spring to the fifth truncated cone 25 and preventing the retaining spring from moving axially, thereby limiting the position of the second bearing 5.

[0033] Example 2:

[0034] Based on Example 1, as another implementation method, Figure 1 and 3 As shown, the limiting member 6 is sleeved on the fifth truncated platform 25 , and the limiting member 6 and the fifth truncated platform 25 are threadedly matched, thereby fixing the limiting member 6 and the fifth truncated platform 25 to achieve the limitation of the second bearing 5 .

[0035] Example 3:

[0036] Based on Example 1, as another implementation method, Figure 1 and 4 As shown, the limit member 6 is sleeved on the fifth truncated cone 25. A plurality of locking holes 27 are arranged in a circumferential array on the fifth truncated cone 25. The locking holes 27 are arranged radially. A locking pin 28 is threadedly connected to the locking hole 27. The part of the locking pin 28 located outside the locking hole 27 abuts against the side of the limit member 6 away from the second bearing 5. The locking pin 28 is fixed to the fifth truncated cone 25, thereby limiting the side of the limit member 6 away from the second bearing 5, and finally limiting the second bearing 5.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A base assembly for a speed reducer, comprising a housing (1), a gear shaft (2) and a skeleton oil seal (3), characterized in that: A first installation cavity (11), a second installation cavity (12), and a third installation cavity (13) are sequentially provided in the housing (1); the inner diameter of the second installation cavity (12) is smaller than the inner diameters of the first installation cavity (11) and the third installation cavity (13); The gear shaft (2) is provided with a first truncated cone (21), a second truncated cone (22), a third truncated cone (23) and a fourth truncated cone (24) of successively decreasing diameters; the second truncated cone (22) is sleeved with a first bearing (4), and the first bearing (4) is embedded in the first mounting cavity (11); the third truncated cone (23) is sleeved with the skeleton oil seal (3), and the skeleton oil seal (3) is embedded in the second mounting cavity (12); the fourth truncated cone (24) is sleeved with a second bearing (5), and the second bearing (5) is embedded in the third mounting cavity (13); The first truncated table (21) abuts against the first bearing (4); a detachable limiting member (6) is provided on a side of the second bearing (5) away from the first bearing (4); and the limiting member (6) abuts against the second bearing (5).

2. A reducer base assembly according to claim 1, characterized in that: A fifth truncated cone (25) is further provided on a side of the fourth truncated cone (24) away from the third truncated cone (23). The diameter of the fifth truncated cone (25) is smaller than the diameter of the fourth truncated cone (24). The position-limiting member (6) is provided on the fifth truncated cone (25).

3. The reducer base assembly according to claim 2, characterized in that: The limiting member (6) is a retaining spring, a limiting groove (26) is provided on the fifth truncated table (25), and the retaining spring is provided in the limiting groove (26).

4. The reducer base assembly according to claim 2, characterized in that: The limiting member (6) is sleeved on the fifth truncated platform (25), and the limiting member (6) is threadedly engaged with the fifth truncated platform (25).

5. The reducer base assembly according to claim 2, characterized in that: The limiting member (6) is sleeved on the fifth truncated cone (25). A plurality of locking holes (27) are arranged in a circumferential array on the fifth truncated cone (25). The locking holes (27) are arranged radially. A locking pin (28) is threadedly connected to the locking hole (27). The portion of the locking pin (28) located outside the locking hole (27) abuts against a side of the limiting member (6) away from the second bearing (5).

6. A reducer base assembly according to any one of claims 3 to 5, characterized in that: The first bearing (4) and the second bearing (5) are both spherical roller bearings.

7. The reducer base assembly according to claim 6, characterized in that: The first circular platform (21) is sleeved with a first gear (7), and the fifth circular platform (25) is sleeved with a second gear (8).

8. The reducer base assembly according to claim 6, characterized in that: The second truncated platform (22) is also sleeved with a dust cover (9), and the dust cover (9) is located between the first truncated platform (21) and the first bearing (4).

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