Bearing fixing structure and reduction gearbox

Abstract

The utility model discloses a bearing fixing structure and reduction gearbox, relates to reduction gearbox structure technical field, wherein the bearing fixing structure includes two bearing seats and fixing structure, the two bearing seats are oppositely arranged along the first direction, each bearing seat is provided with a cavity with an opening at one end, the openings of the two bearing seats are oppositely arranged, and the fixing structure is fixed on the two bearing seats. The inner wall of the cavity is used for being installed on a corresponding bearing outer ring in a sleeved mode. According to the technical scheme provided by the utility model, the bearing seats are arranged outside the two bearings, and the two bearing seats are connected and fixed by the fixing structure, so that the problems that the specification of the bearings is too large and the installation space is enlarged due to the fact that the bearing is too large when the input shaft is used are solved, and the service life of the input shaft is prolonged. According to the bearing fixing structure, the purpose that a small-specification bearing is matched with the fixing structure to achieve bearing stress instead of traditional large-specification bearings is achieved, and the limited space layout of the reduction gearbox is met.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducer structures, and particularly relates to a bearing fixing structure and a speed reducer. Background Art

[0002] In conventional speed reducer structure solutions, the input shaft usually adopts ball bearings and the intermediate shaft adopts tapered bearings for layout. To meet the development trend of miniaturization and high efficiency of electric drive, a ball bearing solution is adopted for the side input shaft and intermediate shaft of the speed reducer to replace the above conventional solution; however, due to the high bearing load requirement of the intermediate shaft, under the same boundary conditions, the selected specification size of the ball bearing is larger than that of the tapered bearing, so the bearing near the gear side bears too much load, resulting in an oversized bearing specification and affecting the overall layout. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a bearing fixing structure, aiming to provide a structure that can select small-sized bearings to achieve load bearing and meet the problem of limited space layout of the speed reducer.

[0004] To achieve the above purpose, the bearing fixing structure proposed by the utility model includes:

[0005] Two bearing seats are arranged opposite to each other along the first direction. Each bearing seat forms a cavity with one end open, and the openings of the two bearing seats are arranged opposite to each other. The inner wall of the cavity is used for sleeving and installing with the corresponding bearing outer ring; and,

[0006] A fixing structure is used to connect the two open ends of the two bearing seats.

[0007] In one embodiment, the fixing structure includes:

[0008] An annular pressing plate is arranged between the two open ends of the two bearing seats; and,

[0009] A locking part is used to lock the annular pressing plate with one of the two bearing seats.

[0010] In one embodiment, the bearing fixing structure further includes an assembly cylinder. One end of the assembly cylinder along the first direction is connected to the open end of one of the two bearing seats, and the other end is connected to the annular pressing plate.

[0011] In one embodiment, the bearing fixing structure further includes a guide groove, and the guide groove is opened at the open end of one of the two bearing seats;

[0012] The guide groove is adapted to the annular pressing plate.

[0013] In one embodiment, the fixing structure further includes a plurality of positioning bosses, and each of the positioning bosses is disposed around the outer peripheral wall of the annular pressing plate.

[0014] In one embodiment, a threaded hole is formed inside each of the positioning bosses, and a through hole opposite to the threaded hole is formed inside one of the two bearing seats.

[0015] The locking portion includes a pressing bolt, and the pressing bolt passes through the through hole and is threadedly connected to the threaded hole.

[0016] In one embodiment, the bearing fixing structure further includes a support column, the support column is disposed on the outer peripheral wall of the assembly cylinder, a positioning hole is formed on one side of the support column close to the positioning boss, and the positioning hole is adapted to the positioning boss.

[0017] In one embodiment, the bearing fixing structure further includes a shaft body and a fixing portion.

[0018] At both ends of the shaft body along its axial direction, they respectively correspond to the two open ends of the two bearing seats, and the two bearings are arranged in parallel on the outer peripheral wall of the shaft body along a first direction.

[0019] The fixing portion is disposed at one end of the shaft body along its axial direction for fixing one of the two bearings to the shaft body.

[0020] In one embodiment, the fixing portion includes a fixing bolt.

[0021] The present utility model further provides a speed reducer, including the above-mentioned bearing fixing structure.

[0022] The technical solution of the present utility model is to provide bearing seats outside the two bearings, and the fixing structure connects and fixes the two bearing seats, avoiding the problem that when the input shaft is used, due to excessive bearing load, the bearing specification is too large and the installation space is expanded. The bearing fixing structure realizes the purpose of using small-sized bearings to cooperate with the fixing structure to bear the load, replacing the traditional large-sized bearings to bear the load, and meeting the limited space layout of the speed reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 Schematic diagram of a structure of an embodiment of the bearing fixing structure provided by the present utility model;

[0025] Figure 2 Stereoscopic diagram of the annular pressing plate in the bearing fixing structure provided by the present utility model;

[0026] Figure 3 Stereoscopic diagram of the connection between the assembly cylinder and the support column in the bearing fixing structure provided by the present utility model;

[0027] Figure 4 Stereoscopic diagram of the bearing fixing structure provided by the present utility model;

[0028] Figure 5 Schematic diagram of the initial connection state between the annular pressing plate and the pressing bolt in the bearing fixing structure provided by the present utility model.

[0029] Explanation of the reference numerals in the drawings:

[0030] 100, bearing fixing structure; 1, bearing seat; 11, cavity; 12, first bearing seat; 13, second bearing seat; 2, bearing; 21, first bearing; 22, second bearing; 3, fixing structure; 31, annular pressing plate; 32, locking part; 321, pressing bolt; 33, positioning boss; 4, assembly cylinder; 5, guiding groove; 6, support column; 61, positioning hole; 7, shaft body; 8, fixing part; 81, fixing bolt.

[0031] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] In the conventional speed reducer structure scheme, the layout is often carried out by using ball bearings for the input shaft and tapered bearings for the intermediate shaft. To meet the development trend of miniaturization and high efficiency of electric drive, a ball bearing scheme is adopted for the input shaft and intermediate shaft on the speed reducer side to replace the above conventional scheme. However, due to the high load requirement of the intermediate bearing, under the same boundary conditions, the selected specification size of the ball bearing is larger than that of the tapered bearing, so the bearing near the gear side bears too much load, resulting in an oversized bearing specification and affecting the overall layout.

[0036] The present utility model proposes a bearing fixing structure.

[0037] Please refer to Figures 1 to 5 , in an embodiment of the present utility model, the bearing fixing structure includes two bearing seats 1 and a fixing structure 3. The two bearing seats 1 are arranged oppositely along a first direction. Each bearing seat 1 forms a cavity 11 with one end open. The openings of the two bearing seats 1 are arranged oppositely. The inner wall of the cavity 11 is used for sleeving and installing with the outer ring of the corresponding bearing 2. The fixing structure 3 is used for connecting the two open ends of the two bearing seats 1.

[0038] The technical solution of the present utility model is that two bearing seats 1 are arranged oppositely along a first direction. Each bearing seat 1 forms a cavity 11 with one end open. The openings of the two bearing seats 1 are arranged oppositely. The inner wall of the cavity 11 is used for sleeving and installing with the outer ring of the corresponding bearing 2. The fixing structure 3 is used for connecting the two open ends of the two bearing seats 1. With such a setting, by providing bearing seats 1 outside the two bearings 2, the fixing structure 3 connects and fixes the two bearing seats 1, avoiding the problem that the bearing 2 has an oversized specification due to excessive load of the bearing 2 during the use of the input shaft, and expanding the installation space. The bearing fixing structure 100 realizes the purpose of using small - specification bearings to cooperate with the fixing structure 3 to bear the load, replacing the traditional large - specification bearings to bear the load, and meeting the limited space layout of the speed reducer.

[0039] The installation method of the cavity 11 and the outer ring of the corresponding bearing 2 can be press - fitting.

[0040] The fixed structure 3 can be set up by connecting with a rod and a bolt, or by connecting with a clamping groove and a clamping post. For the specific setting method, please refer to the following specific description.

[0041] Furthermore, considering the use effect, in the technical solution of this embodiment, the fixed structure 3 includes an annular pressing plate 31 and a locking part 32. The annular pressing plate 31 is arranged between the two open ends of the two bearing seats 1, and the annular pressing plate 31 is movably installed between the two bearing seats 1; the locking part 32 is used to lock the annular pressing plate 31 with one of the two bearing seats 1; in this way, through the setting of the annular pressing plate 31, the two bearing seats 1 can be connected in alignment through the annular pressing plate 31, and finally through the setting of the locking part 32, the purpose of locking and fixing the two bearing seats 1 is achieved, thereby realizing the transmission and dispersion of force.

[0042] In this embodiment, the setting method of the locking part 32 is not specifically limited, and it can be a bolt or a clamping post.

[0043] Considering that in the speed reducer structure, the installation space is limited, in order to facilitate the installation of the locking part 32, in the technical solution of this embodiment, the bearing fixing structure 100 further includes an assembly cylinder 4. One end of the assembly cylinder 4 in the first direction is connected to the open end of one of the two bearing seats 1, and the other end is connected to the annular pressing plate 31; in this way, the setting of the assembly cylinder 4 extends the installation position of the bearing seat 1, which is convenient for connecting with the annular pressing plate 31. While facilitating the locking part 32 to lock the annular pressing plate 31, the assembly cylinder 4 can also be directly locked, thereby realizing the transmission of force.

[0044] The installation method of the assembly cylinder 4 can be integrally arranged with one of the two bearing seats 1. The structure is simple, and the locking part 32 is arranged on the other of the two bearing seats 1 for cooperative installation.

[0045] It should be noted that the assembly cylinder 4 is semi - enclosed, which is beneficial to expose the shaft body 7 for convenient use.

[0046] Furthermore, in order to make the annular pressing plate 31 fit and install with the bearing seat 1, in the technical solution of this embodiment, the bearing fixing structure 100 further includes a guide groove 5. The guide groove 5 is opened at the open end of one of the two bearing seats 1; the guide groove 5 is adapted to the annular pressing plate 31; in this way, the guide groove 5 provides an installation position for the annular pressing plate 31, which is beneficial to place the annular pressing plate 31, and can save space for layout while positioning.

[0047] Furthermore, in order to facilitate the installation with the assembly cylinder 4, in the technical solution of this embodiment, the fixing structure 3 further includes a plurality of positioning bosses 33, and each of the positioning bosses 33 is arranged around the outer peripheral wall of the annular pressing plate 31; thus, through the arrangement of the positioning bosses 33, it can be directly clamped and fixed with the assembly cylinder 4, realizing the press-fitting alignment of the assembly cylinder 4 and reducing the fixing difficulty.

[0048] Considering that the assembly cylinder 4 needs a certain thickness to be clamped with the positioning boss 33, in order not to affect the use of the shaft body 7, in the technical solution of this embodiment, the bearing fixing structure 100 further includes a support column 6, the support column 6 is arranged on the outer peripheral wall of the assembly cylinder 4, and a positioning hole 61 is opened on one side of the support column 6 close to the positioning boss 33, and the positioning hole 61 is adapted to the positioning boss 33; thus, through the arrangement of opening the positioning hole inside the support column 6, it is convenient to perform alignment clamping with the positioning boss 33, and through the arrangement of the support column 6, it is avoided that the size of the assembly cylinder 4 is set too thick to affect the use.

[0049] It should be noted that both the support column 6 and the positioning boss 33 are provided with three, and each of the support columns 6 is fixedly arranged around the outer peripheral wall of the assembly cylinder 4 along the first direction along its axis direction, each of the positioning bosses 33 is fixedly arranged around the outer peripheral wall of the annular pressing plate 31, and each of the positioning bosses 31 is press-fitted with each of the support columns 6.

[0050] Considering the installation and use of the locking portion 32, in the technical solution of this embodiment, a threaded hole is opened inside each of the positioning bosses 33, and a through hole opposite to the threaded hole is opened inside one of the two bearing seats 1; the locking portion 32 includes a pressing bolt 321, and the pressing bolt 321 passes through the through hole to be threadedly connected with the threaded hole; thus, the pressing bolt 321 can pass through the through hole to be threadedly connected with the threaded hole, that is, one of the two bearing seats 1 is fixed with the positioning boss 33 through the locking portion 32, achieving the purpose of installing the pressing bolt 321 from the outside of the bearing seat 1 and solving the problem that it cannot be installed inside.

[0051] In this embodiment, the bearing fixing structure 100 further includes a shaft body 7 and a fixing portion 8; both ends of the shaft body 7 along its axial direction correspond to the two open ends of the two bearing seats 1 respectively, and the two bearings 2 are arranged in parallel along a first direction on the outer peripheral wall of the shaft body 7; the fixing portion 8 is arranged at one end of the shaft body 7 along its axial direction for fixing one of the two bearings 2 to the shaft body 7; thus, the fixing portion 8 fixes the shaft body 7 to the inner ring of the bearing seat 1 and cooperates with the locking portion 32 to fix the outer ring of the bearing seat 1, achieving the purpose of balancing the bearing force.

[0052] In the speed reducer structure, the shaft body 7 can be a gear shaft. In the case where the shaft body 7 is a gear shaft, since the load is the largest under the positive drive condition, the bearing on the gear side of the gear shaft bears a relatively large force. To balance the bearing force, the bearing fixing structure 100 is provided to connect the two bearings 2 through the two bearing seats 1 and the fixing structure 3. While balancing the bearing force, small-sized bearings are selected to achieve the purpose of reducing the space layout and meet the limited space layout of the speed reducer.

[0053] The setting method of the fixing portion 8 can be a bolt or a clamping joint.

[0054] Specifically, in this embodiment, the fixing portion 8 includes a fixing bolt 81 for connecting the annular pressing plate 31.

[0055] It should be noted that a bearing seat hole is provided on the bearing seat 1 to facilitate the installation of the shaft body 7.

[0056] It should be added that bearing shoulders are provided on both of the two bearing seats 1 to ensure the correct assembly and use of the bearings 2.

[0057] Considering that in the use of the gear shaft, the bearing on the gear side of the gear shaft bears a relatively large force, the fixing structure 3 is arranged on the bearing on the side away from the gear of the gear shaft. For the specific setting method, please refer to the following description.

[0058] In the embodiment where the shaft body 7 is provided as a gear shaft, considering that the bearing 2 near the gear side of the gear shaft only bears the radial force perpendicular to the first direction, and the bearing 2 at the end far from the gear side bears both the radial force and the axial force in the first direction brought by the gear side. In this embodiment, one end of the assembly cylinder 4 in the first direction is fixed to the bearing seat 1 near the gear side of the shaft body 7, and the other end of the assembly cylinder 4 in the first direction is connected to the bearing seat 1 far from the gear side through the fixing structure 3. In this way, the bearing near the gear side only bears the radial force, and the bearing far from the gear side bears both the radial force and the axial force brought by the helical gear, avoiding excessive load on the bearing near the gear side, resulting in an oversized bearing specification and affecting the spatial layout inside the speed reducer.

[0059] Specifically, in this embodiment, among the two bearing seats 1, the bearing seat 1 near the gear side of the gear shaft is set as the first bearing seat 12, and the bearing seat 1 far from the gear side of the gear shaft is set as the second bearing seat 13. The locking part 32 locks and fixes the annular pressing plate 31 and the second bearing seat 13 to realize the outer ring fixation of the second bearing seat 13. Similarly, both bearings 2 are press-fitted on the outer peripheral wall of the gear shaft. The bearing 2 near the gear side of the gear shaft is set as the first bearing 21, and the bearing 2 far from the gear side of the gear shaft is set as the second bearing 22. The fixing part 8 fixes the second bearing 22 and the gear shaft to realize the inner ring fixation of the second bearing seat 13, that is, to achieve the purpose of internally and externally fixing the second bearing 22 and the end of the gear shaft far from the gear side through the fixing structure 3, and to press-fit and fix the first bearing seat 12 and the first bearing 21 on the gear side of the gear shaft, so as to achieve the purpose of selecting small-sized bearings to reduce the spatial layout and meet the limited spatial layout of the speed reducer.

[0060] Of course, in order to achieve the above purpose of installing the pressing bolt 321 from the outside of the bearing seat 1, that is, pressing one end of the annular pressing plate 31 in its thickness direction against the assembly cylinder 4, and arranging the guiding groove 5 at the open end of the second bearing seat 13, which is convenient for fitting and installing with the other end of the annular pressing plate 31 in its thickness direction. The pressing bolt 321 passes through the threaded hole opened inside the positioning boss 33 from the outside of the second bearing seat 13 to be fixed to the first bearing seat 12.

[0061] It should be added that the setting method of the annular plate pressing plate 31 can be a closed setting or an open setting.

[0062] In an embodiment where the annular pressing plate 31 is arranged in a closed manner, the assembly method between the fixing structure 3, the two bearing seats 1 and the gear shaft is as follows: first press-fit the first bearing 21 on the gear shaft, place the annular pressing plate 31, then press-fit the second bearing 22, and install the fixing bolt 81 at one end of the gear shaft away from the gear side to complete the inner ring fixing of the second bearing 22. Press-fit the second bearing seat 13 on the second bearing 22. First place the gear shaft in the bearing seat hole of the first bearing seat 12, then correspondingly install the positioning boss 33 on the annular pressing plate 31 with the support column 6, then assemble the second bearing seat 13, and finally fix the annular pressing plate 31 by externally tightening the pressing bolt 321.

[0063] In the setting mode where the annular pressing plate 31 is open, the assembly method between the fixing structure 3 and the two bearing seats 1 is: after placing the gear shaft on the bearing seat hole of the first bearing seat 12, it is also possible to place the annular pressing plate 31.

[0064] It should be noted that bearing seat holes can be provided on the bearing seat 1 for cooperation with the shaft body 7.

[0065] The present utility model also proposes a speed reducer, which includes a bearing fixing structure. The specific structure of the bearing fixing structure refers to the above embodiments. Since this speed reducer adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0066] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A bearing fixing structure, characterized in that: include: Two bearing seats are arranged opposite to each other along a first direction, each of the bearing seats is formed with a cavity having an opening at one end, the openings of the two bearing seats are arranged opposite to each other, and the inner wall of the cavity is used to be mounted on the corresponding bearing outer ring sleeve; and, The fixing structure is used to connect the two open ends of the two bearing seats.

2. The bearing fixing structure according to claim 1, characterized in that: The fixed structure comprises: an annular pressure plate, disposed between the two open ends of the two bearing seats; and The locking portion is used to lock the annular pressure plate with one of the two bearing seats.

3. The bearing fixing structure according to claim 2, characterized in that: The bearing fixing structure also includes an assembly cylinder, one end of which along the first direction is connected to one of the open ends of the two bearing seats, and the other end of which is connected to the annular pressure plate.

4. The bearing fixing structure according to claim 2, characterized in that: The bearing fixing structure further comprises a guide groove, wherein the guide groove is provided at an open end of one of the two bearing seats; The guide groove is matched with the annular pressure plate.

5. The bearing fixing structure according to claim 3, characterized in that: The fixing structure further comprises a plurality of positioning bosses, each of which is arranged on the outer peripheral wall of the annular pressure plate.

6. The bearing fixing structure according to claim 5, characterized in that: A threaded hole is formed inside each of the positioning bosses, and a through hole opposite to the threaded hole is formed inside one of the two bearing seats; The locking portion includes a clamping bolt, and the clamping bolt passes through the through hole to be threadedly connected with the threaded hole.

7. The bearing fixing structure according to claim 5, characterized in that: The bearing fixing structure also includes a support column, which is arranged on the outer peripheral wall of the assembly cylinder. A positioning hole is opened on one side of the support column close to the positioning boss, and the positioning hole is matched with the positioning boss.

8. The bearing fixing structure according to claim 1, characterized in that: The bearing fixing structure also includes a shaft body and a fixing portion; The two ends of the shaft body along the axial direction thereof correspond to the two open ends of the two bearing seats respectively, and the two bearings are arranged in parallel along the first direction on the outer peripheral wall of the shaft body; The fixing portion is arranged at one end of the shaft body along the axial direction thereof, and is used to fix one of the two bearings to the shaft body.

9. The bearing fixing structure according to claim 8, characterized in that: The fixing portion includes a fixing bolt.

10. A reduction gearbox, characterized in that: It comprises the bearing fixing structure as described in any one of claims 1 to 9.

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