Flywheel assembly structure for diesel generator set

Abstract

The utility model relates to a kind of flywheel assembly structure for diesel generating set, including flywheel shell, flywheel, connecting disc, generator fan and generator shell;Flywheel is installed in the inside of flywheel shell, and the side of flywheel towards generator shell extends and is provided with flywheel lengthening section, flywheel lengthening section is provided with boss, boss and the clearance fit between the inner wall of generator shell;Flywheel lengthening section end is provided with inclined plane around the outer periphery of connecting disc installation area, by the clearance fit of boss of flywheel lengthening section and the inner wall of generator shell, limit flywheel radial displacement when generator speed fluctuation, effectively inhibit the car of because flywheel and shell interference causes and abnormal shaking, improve operating stability;Flywheel lengthening section end circumferentially continuously distributed inclined plane structure converts the axial pre-tightening force of connecting disc bolt into uniform radial component force, reduce the stress peak of bolt connection area, avoid the local stress concentration of traditional right-angle step structure, simultaneously eliminate the vibration source caused by assembly eccentricity.

Description

Technical Field

[0001] This utility model belongs to the field of generator flywheel technology, specifically relating to a flywheel assembly structure for diesel generator sets. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] As a key component of a generator, the flywheel's main function is to store the energy generated during generator operation for release when needed, while also transmitting the starting torque of the starter motor to start the generator. Furthermore, the flywheel's large inertia effectively absorbs and buffers unbalanced forces during crankshaft rotation, significantly reducing generator speed fluctuations and ensuring smooth and reliable power output.

[0004] In the generator set market, due to the wide variety of equipment applications, including industrial machinery, generator sets, and transportation vehicles, the dynamic balance characteristics of different generator sets vary significantly. The main problem lies in the inconsistencies in manufacturing tolerances, material properties, and assembly precision of flywheels, crankshafts, and related components. This difference leads to inconsistent performance of the same model of generator on different equipment: some equipment matches well, and the generator operates stably and efficiently; while other equipment experiences large fluctuations in generator speed, making it prone to wobbling (i.e., shaking caused by unstable speed) and abnormal generator vibration, which in turn leads to increased equipment vibration and performance degradation. Utility Model Content

[0005] The purpose of this utility model is to provide a flywheel assembly structure for diesel generator sets, which can at least solve one of the above-mentioned technical problems.

[0006] To achieve the above objectives, an embodiment of this utility model provides a flywheel assembly structure for a diesel generator set, including a flywheel housing, a flywheel, a connecting plate, a generator fan, and a generator housing. The flywheel is installed inside the flywheel housing and extends towards the generator housing to form an extended flywheel section. A boss is provided on the extended flywheel section. The outer contour of the boss forms a clearance fit with the inner wall of the generator housing. An inclined surface is also provided at the end of the extended flywheel section, located on the outer periphery of the connecting plate mounting area. The connecting plate is fixedly connected to the extended flywheel section of the flywheel by bolts. The flywheel generator fan is fixedly connected to the connecting plate. The generator housing covers the extended flywheel section, the connecting plate, and the generator fan, and the generator housing is fixedly connected to the flywheel housing.

[0007] Furthermore, the flywheel and the flywheel housing have gaps in both the axial and radial directions.

[0008] Furthermore, the protrusion profile of the extended flywheel section is adapted to the shape of the inner wall of the generator housing.

[0009] Furthermore, the boss is located radially outside the extended section of the flywheel.

[0010] Furthermore, the inclined surfaces are continuously distributed circumferentially around the mounting area of ​​the connecting disc.

[0011] Furthermore, the inclined plane forms an angle with the horizontal direction.

[0012] Furthermore, the generator fan is coaxially and fixedly connected to the connecting plate.

[0013] Furthermore, the generator housing and the flywheel housing are connected by circumferentially distributed fasteners.

[0014] Furthermore, the generator housing sidewall is provided with an operation window, the position of which corresponds to the inclined surface on the extended section of the flywheel.

[0015] Furthermore, the axial length of the extended flywheel section is greater than that of the standard flywheel structure.

[0016] The beneficial effects of the above technical solutions are as follows: This invention utilizes the clearance fit between the protrusion of the extended section of the flywheel and the inner wall of the generator housing to limit the radial displacement of the flywheel when the generator speed fluctuates, effectively suppressing the wobbling phenomenon and abnormal vibration caused by interference between the flywheel and the housing, and improving operational stability.

[0017] The circumferentially continuous inclined structure at the end of the extended flywheel section transforms the axial preload of the connecting disc bolts into a uniform radial component force, significantly reducing the stress peak in the bolt connection area, avoiding local stress concentration in the traditional right-angle step structure, and eliminating vibration sources caused by assembly eccentricity.

[0018] The flywheel and flywheel housing are designed with clearances in both the axial and radial directions to form a dual dynamic compensation: the axial clearance absorbs thermal expansion and the radial clearance accommodates rotational offset, eliminating frictional losses and local stress damage, and ensuring that the flywheel remains dynamically balanced under thermal deformation and tolerance accumulation. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is an exploded view of the flywheel assembly structure in an embodiment of the present invention; Figure 2 This is a side sectional view of the flywheel assembly structure in an embodiment of this utility model; Figure 3 This is a three-dimensional schematic diagram of the flywheel assembly structure in an embodiment of this utility model.

[0021] In the diagram, 1. Flywheel housing; 2. Flywheel; 3. Connecting disc; 4. Generator fan; 5. Generator housing; 6. Bolt; 7. Angled surface; 8. Boss; 9. Operating window. Detailed Implementation

[0022] like Figures 1 to 3 As shown, this embodiment provides a flywheel assembly structure for a diesel generator set, including a flywheel housing 1, a flywheel 2, a connecting disc 3, a generator fan 4, and a generator housing 5.

[0023] like Figure 1 As shown, the flywheel 2 is installed inside the flywheel housing 1, and an extended section of the flywheel 2 extends towards the generator housing 5. The extended section of the flywheel 2 has a boss 8, which is clearance-fitted with the inner wall of the generator housing 5. The end of the extended section of the flywheel 2 has a bevel 7 surrounding the outer periphery of the mounting area of ​​the connecting plate 3. The connecting plate 3 is fixed to the flywheel 2 by bolts 6, and the generator fan 4 is mounted on the connecting plate 3. The generator housing 5 completely covers the extended section, the connecting plate 3, and the fan, and is connected to the flywheel housing 1.

[0024] Specifically, the extended section of flywheel 2 refers to the part of flywheel 2 that extends axially towards generator housing 5. This can be achieved through integral casting or segmented assembly, and serves to increase the rotational inertia of flywheel 2 and form a mating interface with generator housing 5. The boss 8 is an annular protrusion located radially outward of the extended section, formed by turning. Its outer contour matches the shape of the inner wall of generator housing 5, forming a clearance fit. The inclined surface 7 is an inclined surface surrounding the mounting area of ​​connecting disc 3 at the end of the extended section, achieved through tapered machining, used to distribute stress in the bolt 6 connection area. The clearance fit refers to the clearance maintained between the outer contour of boss 8 and the inner wall of generator housing 5 (the specific dimensions can be calculated based on the dimensional chain between various parts), allowing for slight displacement of flywheel 2 during operation.

[0025] like Figure 1 and Figure 2 As shown, when the extended section of flywheel 2 extends into the internal space of generator housing 5, a dynamic adaptation mechanism is formed through the clearance fit between the boss 8 and the inner wall of the housing. When the generator vibrates during operation, flywheel 2 can adaptively adjust its position within a limited range to avoid rigid collision with generator housing 5. The inclined surface 7 structure at the end of the extended section converts the axial load during the installation of connecting plate 3 into a radial component force, reducing the stress peak at the bolt 6 connection. Generator fan 4 forms a rigid connection with flywheel 2 through connecting plate 3, ensuring the stability of the power transmission path. The fixed connection between generator housing 5 and flywheel housing 1 forms a closed cavity, effectively blocking external vibration interference.

[0026] The flywheel 2 has clearances both axially and radially with respect to the flywheel housing 1. The axial clearance refers to the distance between the flywheel 2 and the flywheel housing 1 along the axial direction, allowing the flywheel 2 to extend freely along the axis when heated. The radial clearance is the annular space between the outer circumference of the flywheel 2 and the inner wall of the flywheel housing 1, providing space for radial displacement during flywheel 2 rotation. The radial displacement clearance range is (3±1mm), and the axial displacement clearance range is (2±0.5mm).

[0027] Specifically, when the generator is running, the flywheel 2 undergoes axial thermal expansion due to temperature changes. The axial clearance absorbs this expansion, preventing the flywheel 2 end face from squeezing and rubbing against the housing. When the flywheel 2 experiences radial displacement due to assembly errors or centrifugal force, the radial clearance accommodates this displacement, preventing a rigid collision between the outer edge of the flywheel 2 and the inner wall of the housing. This creates a dynamic compensation mechanism for the clearances in both directions between the flywheel 2 and the flywheel housing 1, ensuring that the flywheel 2 remains in a non-contact state during rotation. This eliminates energy loss caused by contact surface friction and avoids structural damage caused by localized stress concentration. This clearance fit allows the flywheel 2 system to maintain dynamic balance under conditions of tolerance accumulation, thermal deformation, and stress deformation.

[0028] like Figure 2 As shown, the profile of the boss 8 on the extended section of the flywheel 2 is adapted to the shape of the inner wall of the generator housing 5. During generator operation, the fit between the profile of the boss 8 and the inner wall of the generator housing 5 can limit the radial displacement of the extended section of the flywheel 2, thereby avoiding interference between the flywheel and the generator housing.

[0029] The boss 8 is located on the radially outer side of the extended section of the flywheel 2. By placing the boss 8 on the radially outer side, the outer contour of the boss 8 can form a clearance fit with the inner wall of the generator housing 5, thereby limiting the radial displacement of the extended section of the flywheel 2 during generator operation.

[0030] The inclined planes 7 are continuously distributed circumferentially around the mounting area of ​​the connecting disc 3. By setting the continuously surrounding inclined planes 7 around the outer periphery of the mounting area of ​​the connecting disc 3, the assembly contact surface between the flywheel 2 and the connecting disc 3 is expanded into an annular region with symmetrical geometric features. When the bolt 6 applies preload, the inclined plane 7 structure converts the axial load into a radial component force evenly distributed along the circumference, avoiding the local stress abrupt change caused by the traditional right-angle step structure. The continuously distributed inclined planes 7 ensure that the contact pressure between the connecting disc 3 and the flywheel 2 remains consistent at all positions around the circumference, eliminating the eccentric load caused by assembly deviations, thereby reducing the vibration energy generated by uneven force when the flywheel 2 rotates.

[0031] The inclined plane 7 forms an angle with the horizontal direction. During generator operation, the axial force generated is decomposed by the inclined plane 7 into a normal component perpendicular to the direction of the inclined plane 7 and a tangential component parallel to the direction of the inclined plane 7, thereby reducing the peak stress at the joint between the connecting plate 3 and the flywheel 2. Simultaneously, the guide surface formed by the inclined angle guides the connecting plate 3 to automatically adjust its axial position during assembly, reducing eccentric vibration caused by assembly deviations.

[0032] The generator fan 4 is coaxially and fixedly connected to the connecting plate 3. This ensures that the fan's rotation center coincides with the power output axis of the flywheel 2, preventing increased centrifugal force caused by assembly deviations during high-speed operation. Simultaneously, the axial bearing surface of the connecting plate 3 forms a surface contact support with the fan base, preventing axial movement that may occur during the rotation of the generator fan 4.

[0033] The generator housing 5 and the flywheel housing 1 are connected by circumferentially distributed fasteners. A uniformly distributed load transfer path reduces local stress concentration. This ensures that the mating surfaces of the generator housing 5 and the flywheel housing 1 are subjected to symmetrically distributed clamping forces in both the axial and radial directions. The resulting uniform contact pressure can offset local gaps caused by machining errors during assembly, while simultaneously suppressing relative displacement of the housings under vibration loads.

[0034] like Figure 3 As shown, the generator housing 5 has an operation window 9 on its side wall. The position of the operation window 9 corresponds to the inclined surface 7 on the extended section of the flywheel 2. When it is necessary to adjust the connection between the connecting plate 3 and the bolt 6 of the flywheel 2, the tool can enter through the operation window 9 along the inclined direction of the inclined surface 7. The inclined surface 7 structure guides the axis of the tool to align with the axis of the bolt 6, thereby realizing the visualization and precise positioning of the fastening operation.

[0035] The extended section of flywheel 2 has a greater axial length than the standard flywheel 2 structure. By increasing the axial extension range of flywheel 2, the overall mass distribution of flywheel 2 is increased, thereby improving the moment of inertia. When the crankshaft transmits power, the extended flywheel 2 structure, through its increased moment of inertia, can buffer periodic torque fluctuations caused by manufacturing tolerances or assembly deviations of the rear-end components.

[0036] The working principle of this utility model: An extended section extends from the flywheel 2 body towards the generator housing 5, with a tapered inclined surface 7 at the end of the extended section. The connecting disc 3 is fixed here by bolts 6. The inclined surface 7 converts the preload of the bolts 6 into a uniform radial component force, significantly reducing stress peaks and eliminating eccentric loads.

[0037] The axial and radial clearance design between flywheel 2 and flywheel housing 1 forms a dual compensation mechanism: the axial clearance absorbs thermal expansion, while the radial clearance accommodates rotational offset, reducing frictional losses in flywheel 2. Generator housing 5 and flywheel housing 1 form a closed cavity through circumferential fasteners, and the evenly distributed clamping force suppresses vibration transmission. The extended section length increases rotational inertia, buffering torque fluctuations in the rear-end components.

[0038] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A flywheel assembly structure for a diesel generator set, characterized in that, The system includes a flywheel housing, a flywheel, a connecting plate, a generator fan, and a generator housing. The flywheel is installed inside the flywheel housing and extends towards the generator housing to form an extended section. The extended section has a boss. The outer contour of the boss forms a clearance fit with the inner wall of the generator housing. The end of the extended section also has a bevel, which is located on the outer periphery of the connecting plate mounting area. The connecting plate is fixedly connected to the extended section of the flywheel by bolts. The flywheel generator fan is fixedly connected to the connecting plate. The generator housing covers the extended section of the flywheel, the connecting plate, and the generator fan, and is fixedly connected to the flywheel housing.

2. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The flywheel and the flywheel housing have gaps in both the axial and radial directions.

3. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The protrusion of the extended flywheel section is adapted to the shape of the inner wall of the generator housing.

4. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The boss is located on the radial outer side of the extended section of the flywheel.

5. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The inclined surfaces are continuously distributed circumferentially around the mounting area of ​​the connecting disc.

6. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The inclined plane forms an angle with the horizontal direction.

7. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The generator fan is coaxially and fixedly connected to the connecting plate.

8. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The generator housing and the flywheel housing are connected by circumferentially distributed fasteners.

9. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The generator housing sidewall is provided with an operation window, the position of which corresponds to the inclined surface on the extended section of the flywheel.

10. The flywheel assembly structure for a diesel generator set according to claim 1, characterized in that, The axial length of the extended flywheel section is greater than that of the standard flywheel structure.

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