Turning gear output shaft with bearing support
The design of the turning gear output shaft with bearing support solves the problems of poor coaxiality and large bending deflection of the traditional output shaft, achieves efficient coaxial compensation and improved stability, and simplifies the maintenance process.
Patent Information
- Application Number
- CN202423196134.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-12-24
AI Technical Summary
The traditional turning gear output shaft has poor coaxiality and large bending deflection during operation, which increases the misalignment between the output shaft and the rotor. It needs to be accurately aligned again during maintenance, resulting in excessively long maintenance time.
The turning gear output shaft is designed with bearing support, including shaft locating flange, spline gear pair, bearing, bearing housing and other components. The thermal expansion and contraction as well as flexible deformation of the rotor are compensated by spline connection and spherical bearing, and lubrication and support are provided by high-pressure and low-pressure oil circuits.
The coaxiality between the output shaft and the rotor is improved, the bending deflection is reduced, the stability and reliability are enhanced, the re-alignment is avoided, and the work efficiency is improved.
Smart Images
Figure CN223374949U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a turning gear output shaft with a bearing support, belonging to the field of turning gear devices. Background Art
[0002] Cranking devices are widely used in various fields, such as steam and gas turbines. They are crucial components of a machine. Before and after the main engine is started and shut down, they continuously rotate the shafting to prevent irreversible bending and deformation of the rotor due to unbalanced heating or cooling. Therefore, high stability is required of the cranking device.
[0003] The cranking gear output shaft is a key component of the cranking gear. It connects the clutch in the cranking gear to the main engine rotor. During operation, it withstands the rotor's thermal expansion deformation and the resulting axial force. When the cranking gear is engaged, the output shaft operates at low speed and high torque. When the cranking gear is disengaged, the output shaft runs at high speed and no load.
[0004] Traditionally, the output shaft is connected to the rotor via a flange, resulting in poor coaxiality and inability to compensate for thermal deformation of the rotor. Furthermore, without bearing support, when the crankshaft is disengaged, the output shaft is cantilevered, exhibiting significant bending deflection. This increases misalignment with the rotor during operation, as the rotor deforms flexurally. High coaxiality between the output shaft and the rotor must be maintained during crankshaft operation, requiring precise alignment during installation to meet operational requirements. When the crankshaft malfunctions or undergoes maintenance, a secondary, precise alignment of the output shaft and rotor connection is required. This secondary, precise alignment is difficult due to the compact on-site equipment layout, resulting in extended maintenance or repair times and impacting planned host operation.
[0005] In summary, the output shaft of a traditional crank has poor coaxiality during operation; when the crank is disengaged, the output shaft has a large bending deflection, which increases the misalignment between the output shaft and the rotor. When the crank fails or is under maintenance, it is necessary to perform precise alignment again during installation. Summary of the Invention
[0006] The utility model is to solve the technical problems that the output shaft of the traditional turning gear has poor coaxiality during operation; when the turning gear is disengaged, the bending deflection of the output shaft is large, which increases the misalignment between the output shaft and the rotor; when the turning gear fails or is under maintenance, it needs to be accurately aligned again during installation, and thus a turning gear output shaft with bearing support is proposed.
[0007] The technical solution of the present utility model is a winch output shaft with a bearing support, which includes a shaft positioning flange, a first spline gear pair, an output shaft body, a bearing baffle, a bearing, a bearing housing, a winch housing, a winch bolt, a winch gear ring, a second spline gear pair, a round nut and a locking plate. The left end of the output shaft body is threadedly connected with a round nut, and the locking plate is fixed to the round nut and the left end portion of the output shaft body. The winch gear ring is spline-connected to the left part of the output shaft body through the second spline gear pair. The winch housing is installed on the outside of the winch gear ring, the left end face of the bearing housing is connected to the fixed right end face of the winch housing, the bearing is installed between the output shaft body and the bearing housing, the bearing baffle is thermally expanded and connected to the output shaft body, the bearing baffle is installed at the left and right ends of the bearing, the right part of the output shaft body is spline-connected to the shaft positioning flange through the first spline gear pair, and the shaft positioning flange is fixedly connected to the external rotor.
[0008] As another improvement of the present invention, it also includes a high-pressure oil inlet hole and a high-pressure oil circuit connected to the high-pressure oil inlet hole. The high-pressure oil inlet hole is opened on the right end face of the upper part of the bearing. The bearing includes a bearing support surface P surface, a bearing left thrust surface A surface and a bearing right thrust surface B surface. The high-pressure oil provides pressure lubrication to the bearing support surface P surface, the bearing left thrust surface A surface and the bearing right thrust surface B surface respectively through the high-pressure oil circuit.
[0009] As another improvement of the present invention, it also includes a low-pressure oil inlet hole, a first radial oil hole, a second radial oil hole, a first axial oil hole and a second axial oil hole. The low-pressure oil inlet hole is opened on the right end face of the lower part of the bearing, one end of the first radial oil hole is connected to the low-pressure oil inlet hole, the other end of the first radial oil hole is opened on the inner wall of the bearing, one end of the second radial oil hole is connected to the low-pressure oil inlet hole, the second radial oil hole and the first axial oil hole are both arranged in the bearing, the second axial oil hole is arranged in the turning gear housing, the other end of the second radial oil hole is connected to the first axial oil hole and the second axial oil hole in sequence, and the second axial oil hole provides lubricating oil to the connection part of the turning gear ring.
[0010] As another improvement of the present invention, the first radial oil hole is also connected to a low-pressure oil circuit leading to the first spline gear pair and the second spline gear pair respectively. The low-pressure oil circuit is arranged horizontally, and a blockage is provided at the left end of the low-pressure oil circuit and an oil plug is provided at the right end of the low-pressure oil circuit.
[0011] As another improvement of the present invention, the bearing housing includes a first bearing housing, a second bearing housing and bearing housing bolts, and the second bearing housing and the first bearing housing are connected from left to right by the bearing housing bolts.
[0012] As another improvement of the present invention, it also includes a positioning groove, a positioning block, a screw, and a spherical surface. A positioning groove is provided on the upper right end surface of the bearing. The positioning block is mounted on the right end surface of the first bearing housing by a screw. The left end surface of the positioning block forms a clearance fit with the bearing, and the outer ring end surface of the bearing is a spherical surface.
[0013] As another improvement of the present invention, it also includes a flange bolt, a pin and a screw plug. The upper part of the shaft positioning flange is connected to the rotor through the flange bolt, and the lower part of the shaft positioning flange is connected to the rotor through the pin. The screw plug is installed at the left end of the pin, and the screw plug is used to limit the axial displacement of the pin.
[0014] As another improvement of the present invention, the end face and the inner hole wall of the bearing 7 are sequentially processed with a first alloy layer, a second alloy layer and a third alloy layer.
[0015] Beneficial effects of the utility model:
[0016] 1. The turning gear ring and output shaft, as well as the output shaft body and rotor of the utility model are all spline-connected to compensate for the thermal expansion of the rotor before the main engine is started and the cold contraction of the rotor after shutdown. At the same time, the spherical bearing has the ability of self-aligning, which can compensate for the flexible deformation of the rotor, increase the coaxiality of the output shaft body and the rotor, reduce the bending deflection of the output shaft when the turning gear is disengaged, and enhance the stability and reliability of the turning gear output shaft.
[0017] 2. When the turning gear fails or is under maintenance, the output shaft and the rotor of the utility model do not need to be accurately aligned again during installation, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The utility model is a schematic diagram of the overall structure of a turning gear output shaft supported by a bearing.
[0019] Figure 2 This is the oil circuit diagram of the rotor in the cold-shrink state.
[0020] Figure 3 This is the oil circuit diagram of the rotor's thermal expansion state.
[0021] Figure 4 This is the top shaft oil circuit diagram.
[0022] Figure 5 This is a schematic diagram of the output shaft body.
[0023] Figure 6 is the rotor flexible deformation diagram.
[0024] Figure 7 It is a schematic diagram of the bearing structure. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the examples of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be explained that the positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are only based on the positional relationships of the orientations shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the components referred to have a specific orientation, are constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.
[0026] Specific implementation method 1: Combination Figures 1 to 7 Explain this embodiment, this embodiment includes a shaft positioning flange 5, a first spline gear pair 4, an output shaft body 21, a bearing baffle 27, a bearing 7, a bearing housing, a turning gear housing 12, a turning gear bolt 11, a turning gear ring 13, a second spline gear pair 14, a round nut 25 and a locking plate 26. The left end of the output shaft body 21 is threadedly connected with a round nut 25, and the locking plate 26 is fixed to the round nut 25 and the left end of the output shaft body 21. The turning gear ring 13 is connected to the output shaft body 21 through the second spline gear pair 14. 1 is splined, the turning gear housing 12 is installed on the outside of the turning gear ring 13, the left end face of the bearing housing is connected to the right end face fixed to the turning gear housing 12 through the turning gear bolt 11, the bearing 7 is installed between the output shaft body 21 and the bearing housing, the bearing baffle 27 is thermally expanded to the output shaft body 21, the bearing baffle 27 is installed at the left and right ends of the bearing 7, the right part of the output shaft body 21 is splined to the shaft positioning flange 5 through the first spline gear pair 4, and the shaft positioning flange 5 is fixedly connected to the external rotor 2.
[0027] The turning gear ring and output shaft, as well as the output shaft and rotor, are connected using involute splines with clearance. This compensates for thermal expansion and contraction of the shafting and rotor, as well as for deflection caused by gravity. In the event of a turning gear failure or maintenance, precise re-alignment of the output shaft and rotor is eliminated during installation, improving work efficiency.
[0028] Specific implementation method 2: Combination Figures 2 to 5This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that it also includes a high-pressure oil inlet hole 6 and a high-pressure oil circuit connected to the high-pressure oil inlet hole 6. The high-pressure oil inlet hole 6 is provided on the upper right end face of the bearing 7. The bearing 7 includes a bearing support surface P surface, a bearing left thrust surface A surface and a bearing right thrust surface B surface. High-pressure oil provides pressure lubrication to the bearing support surface P surface, the bearing left thrust surface A surface and the bearing right thrust surface B surface respectively through the high-pressure oil circuit. The friction force generated by thermal expansion between the spline tooth surfaces is borne by the thrust bearing surface of the bearing. The rotor is in a cold contraction state, and the rotor and the shaft positioning flange move to the right along the first spline gear pair. The output shaft body is subjected to rightward friction. At this time, the high-pressure oil enters the oil circuit through the high-pressure oil inlet hole, and the oil circuit is pressed according to Figure 2 The high-pressure oil acts in the direction of the arrow in the oil passage. The high-pressure oil acts on the left thrust surface A of the bearing. The pressure generated by the high-pressure oil and the rightward friction force generated on the output shaft body after the rotor shrinks form a pair of balancing forces, and the output shaft body runs stably. When the rotor is in a state of thermal expansion, the rotor and the shaft positioning flange move to the left along the first spline gear pair, and the output shaft body is subjected to a leftward friction force. At this time, the high-pressure oil enters the oil passage through the high-pressure oil inlet hole. The oil passage is pressed Figure 3 The high-pressure oil acts on the right thrust surface B of the bearing in the direction of the arrow in the middle oil channel. The pressure generated by the high-pressure oil and the leftward friction force caused by the thermal expansion of the rotor form a pair of balancing forces, and the output shaft body runs stably. The high-pressure oil enters the oil channel through the high-pressure oil inlet hole. The oil channel is Figure 4 The high-pressure oil acts on the bearing support surface P, forming an oil film between the bearing and the output shaft body, ensuring smooth operation at low speeds during cranking. Other components and connection methods are the same as those in the first embodiment.
[0029] Specific implementation method three: Combination Figure 1This embodiment differs from the first embodiment in that it further includes a low-pressure oil inlet hole 19, a first radial oil hole 20, a second radial oil hole 18, a first axial oil hole 17, and a second axial oil hole 16. The low-pressure oil inlet hole 19 is located on the right end surface of the lower portion of the bearing 7. One end of the first radial oil hole 20 communicates with the low-pressure oil inlet hole 19. The other end of the first radial oil hole 20 is located on the inner wall of the bearing 7. One end of the second radial oil hole 18 communicates with the low-pressure oil inlet hole 19. Both the second radial oil hole 18 and the first axial oil hole 17 are located within the bearing 7. The second axial oil hole 16 is located within the turning gear housing 12. The other end of the second radial oil hole 18 communicates with the first axial oil hole 17 and the second axial oil hole 16 in sequence. The second axial oil hole 16 supplies lubricating oil to the connection portion of the turning gear ring 13. During turning, the shafting speed is low, and no dynamic oil film can be formed. The static oil film formed by the high-pressure top shaft oil primarily relies on the thrust from the thermal expansion and contraction of the rotor and the weight of the output shaft body. After the rotor's initial run, the output shaft is in an idle-following state, with minimal load. The output shaft is primarily supported by the hydrodynamic oil film, with its center of gravity located within the bearing's support width. The bearing is equipped with high-pressure and low-pressure oil circuits. The high-pressure circuit supplies high-pressure jacking oil to the bearing, while the low-pressure circuit simultaneously lubricates the bearing, splines, and internal gear. Other components and connections are identical to those in Specific Embodiments 1 or 2.
[0030] Specific implementation method four: Combination Figure 1 This embodiment differs from the first embodiment in that the first radial oil hole 20 also connects to a low-pressure oil circuit leading to the first spline gear pair 4 and the second spline gear pair 14, respectively. These low-pressure oil circuits are arranged horizontally, with a plug 15 at the left end and an oil plug 24 at the right end. These low-pressure oil circuits simultaneously provide lubrication to the bearings, splines, and the interior of the turning gear. Other components and connections are the same as those in the first, second, or third embodiments.
[0031] Specific implementation method five: Combination Figure 1 This embodiment differs from the first embodiment in that the bearing housing includes a first bearing housing 10, a second bearing housing 9, and bearing housing bolts 8. The second bearing housing 9 and the first bearing housing 10 are connected from left to right by the bearing housing bolts 8. The other components and connection methods are the same as those of any of the first to fourth embodiments.
[0032] Specific implementation method six: combination Figure 1 and Figure 7This embodiment is different from the first embodiment in that it also includes a positioning groove 51, a positioning block 31, a screw 32, and a spherical surface 42. The upper right end surface of the bearing 7 is provided with a positioning groove 51. The positioning block 31 is mounted on the right end surface of the first bearing housing 10 by means of a screw 32. A clearance fit is formed between the left end surface of the positioning block 31 and the bearing 7. The outer ring end surface of the bearing 7 is a spherical surface 42. The bearing is a spherical dynamic and static pressure combined bearing. The rotor 2 and the shaft positioning flange 5 are affected by gravity and thermal expansion and contraction. Figure 5 The aforementioned flexibility curve 102, reference axis 101, and output shaft 21, under the combined action of the flexibility curve and first spline gear pair 4, rotate along the spherical surface of bearing 7 with the output shaft's center of gravity G as the rotational center of gravity, forming curve 103. At this point, the bearing housing end face C and the bearing end face D are not coplanar. Spherical bearings have self-aligning capabilities, compensating for the rotor's flexible deformation. Therefore, precise alignment of the output shaft body and the rotor connection is unnecessary, reducing the difficulty of installing and debugging the turning gear or turning gear output shaft body, significantly shortening overhaul or maintenance time, and increasing the reliability of the main engine's planned operation. Other components and connection methods are the same as any of Specific Embodiments 1 to 5.
[0033] Specific implementation method seven: combination Figure 1 This embodiment differs from the first embodiment in that it further includes flange bolts 3, pins 23, and screw plugs 22. The upper portion of the shaft positioning flange 5 is connected to the rotor 2 via the flange bolts 3, and the lower portion of the shaft positioning flange 5 is connected to the rotor 2 via the pins 23. The screw plugs 22 are mounted on the left end of the pins 23 and are used to limit the axial displacement of the pins 23. The remaining components and connection methods are the same as those of any of the first to sixth embodiments.
[0034] Specific implementation method eight: combination Figure 1 This embodiment differs from the first embodiment in that the end surface and inner wall of the bearing 7 are sequentially machined with a first alloy layer 52, a second alloy layer 53, and a third alloy layer 54. This serves to enhance the wear resistance between the bearing and the output shaft. The remaining components and connection methods are the same as those of any of the first through seventh embodiments.
[0035] Combine Figures 1 to 7 Explain the working principle of this utility model:
[0036] The turning gear ring is spline-connected to the left side of the output shaft body via the second spline gear pair. This clearance-containing involute spline connection compensates for thermal expansion and contraction of the shafting rotor, as well as flexural deformation of the rotor due to gravity. The turning gear housing is mounted on the outside of the turning gear ring. The left end face of the bearing housing is connected to the fixed right end face of the turning gear housing via turning bolts. The bearing is mounted between the output shaft body and the bearing housing. The right side of the output shaft body is spline-connected to the shaft locating flange via the first spline gear pair, and the shaft locating flange is fixedly connected to the external rotor. The bearing is equipped with high-pressure and low-pressure oil circuits. The high-pressure oil circuit provides high-pressure jacking oil to the bearing, while the low-pressure oil circuit simultaneously provides lubricating oil to the bearing, splines, and the inside of the turning gear. The spherical bearing is self-aligning and is used to compensate for the flexible deformation of the rotor. Precise alignment of the connection between the output shaft body and the rotor is not required.
[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A turning gear output shaft with bearing support, characterized in that It comprises a shaft positioning flange (5), a first spline gear pair (4), an output shaft body (21), a bearing baffle (27), a bearing (7), a bearing housing, a crank housing (12), a crank bolt (11), a crank gear ring (13), a second spline gear pair (14), a round nut (25) and a locking plate (26). The left end of the output shaft body (21) is threadedly connected with the round nut (25). The locking plate (26) is fixed to the round nut (25) and the left end of the output shaft body (21). The crank gear ring (13) is connected to the output shaft body (21) through the second spline gear pair (14). The left part is spline-connected, the winch housing (12) is installed on the outside of the winch gear ring (13), the left end face of the bearing housing is connected to the fixed right end face of the winch housing (12) through the winch bolt (11), the bearing (7) is installed between the output shaft body (21) and the bearing housing, the bearing baffle (27) is thermally expanded and connected to the output shaft body (21), the bearing baffle (27) is installed at the left and right ends of the bearing (7), the right part of the output shaft body (21) is spline-connected to the shaft positioning flange (5) through the first spline gear pair (4), and the shaft positioning flange (5) is fixedly connected to the external rotor (2).
2. A barring gear output shaft with bearing support according to claim 1, characterized in that It also includes a high-pressure oil inlet hole (6) and a high-pressure oil circuit connected to the high-pressure oil inlet hole (6). The high-pressure oil inlet hole (6) is opened on the right end surface of the upper part of the bearing (7). The bearing (7) includes a bearing support surface P surface, a bearing left thrust surface A surface and a bearing right thrust surface B surface. High-pressure oil provides pressure lubrication to the bearing support surface P surface, the bearing left thrust surface A surface and the bearing right thrust surface B surface respectively through the high-pressure oil circuit.
3. A barring gear output shaft with bearing support according to claim 2, characterized in that It also includes a low-pressure oil inlet hole (19), a first radial oil hole (20), a second radial oil hole (18), a first axial oil hole (17) and a second axial oil hole (16). The low-pressure oil inlet hole (19) is opened on the right end surface of the lower part of the bearing (7). One end of the first radial oil hole (20) is connected to the low-pressure oil inlet hole (19). The other end of the first radial oil hole (20) is opened on the inner wall of the bearing (7). One end of the second radial oil hole (18) is connected to the low-pressure oil inlet hole (19). The second radial oil hole (18) and the first axial oil hole (17) are both arranged in the bearing (7). The second axial oil hole (16) is arranged in the crankcase housing (12). The other end of the second radial oil hole (18) is connected to the first axial oil hole (17) and the second axial oil hole (16) in sequence. The second axial oil hole (16) provides lubricating oil to the connection part of the crankcase gear ring (13).
4. A barring gear output shaft with bearing support according to claim 3, characterized in that: The first radial oil hole (20) is also connected to a low-pressure oil circuit leading to the first spline gear pair (4) and the second spline gear pair (14), respectively. The low-pressure oil circuit is arranged horizontally, a plug (15) is provided at the left end of the low-pressure oil circuit, and an oil plug (24) is provided at the right end of the low-pressure oil circuit.
5. The barring gear output shaft with bearing support according to claim 1, characterized in that: The bearing housing comprises a first bearing housing (10), a second bearing housing (9) and a bearing housing bolt (8), and the second bearing housing (9) and the first bearing housing (10) are connected from left to right via the bearing housing bolt (8).
6. The barring gear output shaft with bearing support according to claim 5, characterized in that It also includes a positioning groove (51), a positioning block (31), a screw (32) and a spherical surface (42). The upper portion of the right end surface of the bearing (7) is provided with a positioning groove (51). The positioning block (31) is mounted on the right end surface of the first bearing housing (10) by means of the screw (32). A clearance fit is formed between the left end surface of the positioning block (31) and the bearing (7). The outer ring end surface of the bearing (7) is a spherical surface (42).
7. The barring gear output shaft with bearing support according to claim 1, characterized in that It also includes a flange bolt (3), a pin (23) and a screw plug (22). The upper part of the shaft positioning flange (5) is connected to the rotor (2) through the flange bolt (3), and the lower part of the shaft positioning flange (5) is connected to the rotor (2) through the pin (23). The screw plug (22) is installed at the left end of the pin (23) and is used to limit the axial displacement of the pin (23).
8. The barring gear output shaft with bearing support according to claim 1, characterized in that: The end surface and inner hole wall of the bearing (7) are sequentially processed with a first alloy layer (52), a second alloy layer (53) and a third alloy layer (54).