Universal flywheel and engine testing device

Abstract

The utility model relates to the technical field of engine testing, and discloses a universal flywheel and an engine testing device, which comprise a flywheel body provided with a plurality of circular universal screw holes which correspond to crankshaft screw holes on a crankshaft and are arranged at intervals in the circumferential direction. The crankshaft bolt penetrates through the universal screw hole and can be connected with crankshaft screw holes with different distribution circle diameters, the crankshaft bolt is matched with the crankshaft screw hole, and the diameter of the universal screw hole is set to be larger than that of the crankshaft screw hole, larger than that of the rod part of the crankshaft bolt and smaller than that of the head part of the crankshaft bolt; a circular boss is arranged on the outer side, located in the radial direction of the universal screw hole, of the flywheel body and used for being arranged outside the crankshaft in a sleeving mode, and the inner diameter of the boss is matched with the outer diameter of the crankshaft. Crankshaft bolts penetrate through different positions of the universal screw holes to be connected with the crankshaft screw holes with different distribution circle diameters, the flywheel is suitable for the crankshaft screw holes with approximate distribution circle diameters and then suitable for engines of different models, and the flywheel and the crankshaft are stably connected through the design of the boss.

Description

Technical Field

[0001] The utility model relates to the technical field of engine testing, in particular to a universal flywheel and an engine testing device. Background Art

[0002] During factory testing, engines are mounted on test pallets on the production line, and flywheels are attached to the engine crankshafts to test multiple engines. Because the crankshaft outer diameters and crankshaft bolt circle diameters vary between engines, different flywheel sizes must be replaced during testing based on these values. This requires a large number of flywheels of varying sizes, requiring significant floor space and time-consuming flywheel selection and installation. To address this issue, a universal component is needed to simplify the process.

[0003] CN204612932U discloses a universal connecting disk connected to a flywheel, on which a plurality of groups of matching first connecting holes are arranged according to the flywheel diameters of different engine models. However, each group of first connecting holes is separated from each other and arranged on the connecting disk. Therefore, the universal connecting disk can only be applied to situations where the diameters of the flywheel screw holes of different engine models are greatly different and the circumferential distribution positions of the flywheel screw holes do not overlap. If the circumferential distribution of the screw holes of flywheels of different specifications is the same and the distribution circle diameters are relatively close, resulting in the overlap of the screw hole distribution positions, the screw holes cannot be separated and the universal connecting disk cannot be applied. Utility Model Content

[0004] The purpose of the utility model is to overcome the problem in the prior art that universal components cannot be used when the circumferential distribution of screw holes of different models is the same and the distribution circle diameters are relatively close, resulting in overlap in the distribution positions of the screw holes.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a universal flywheel, including a flywheel body, on which a plurality of circumferentially spaced circular universal screw holes corresponding to the crankshaft screw holes on the crankshaft are provided. The crankshaft bolts can pass through the universal screw holes and be connected with crankshaft screw holes with different distribution circle diameters. The crankshaft bolts match the crankshaft screw holes. The diameter of the universal screw holes is set to be larger than the diameter of the crankshaft screw holes, and larger than the diameter of the crankshaft bolt rod, and smaller than the diameter of the crankshaft bolt head. A circular boss is provided on the radially outer side of the universal screw hole of the flywheel body. The boss is used to be sleeved on the outside of the crankshaft, and the inner diameter of the boss matches the outer diameter of the crankshaft.

[0006] In some embodiments, the flywheel body is also provided with a plurality of single screw holes spaced apart in the circumferential direction, the single screw holes are located on the inner side of the boss, the distribution circle diameter of the single screw holes is different from the distribution circle diameter of the universal screw holes, is the same as the distribution circle diameter of the crankshaft screw holes, and the single screw holes correspond one-to-one to the crankshaft screw holes.

[0007] In some embodiments, the universal screw hole partially overlaps with the single screw hole, and the universal screw hole and the single screw hole share the overlapping portion and are connected through the overlapping portion.

[0008] In some embodiments, the universal screw hole and the single screw hole are distributed at different positions in the circumferential direction of the flywheel body.

[0009] In some embodiments, a gasket is provided inside the boss, the thickness of the gasket is the same as the height of the boss, a protrusion is provided on the outer periphery of the gasket, and a groove matching the protrusion is formed on the boss. The gasket can be mounted on the outside of the crankshaft, and the inner diameter of the gasket matches the outer diameter of the crankshaft.

[0010] In some embodiments, the backing ring is provided with a loading and unloading hole.

[0011] In some embodiments, the flywheel body extends radially outward from the boss toward the side opposite to the boss to form an inclined surface.

[0012] In some embodiments, the inclined surface includes a first inclined surface, a buffer platform, and a second inclined surface sequentially arranged radially outward from the boss.

[0013] On the other hand, the utility model also provides an engine testing device, a crankshaft and the universal flywheel.

[0014] In some embodiments, the boss is sleeved on the outside of the crankshaft, and the crankshaft bolt passes through the universal screw hole and the crankshaft screw hole to connect the crankshaft and the universal flywheel together.

[0015] This technical solution allows crankshaft bolts to be inserted through different locations of the universal screw hole and connected to crankshaft screw holes with different distribution circle diameters, making it suitable for crankshaft screw holes with relatively similar distribution circle diameters, and thus suitable for different engine models. The boss design ensures that the universal screw hole and the crankshaft screw hole are located on the same centerline, ensuring a stable connection between the flywheel and crankshaft during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the back side of the flywheel body disclosed in an embodiment of the present utility model;

[0017] Figure 2 This is a structural schematic diagram of the front side of the flywheel body disclosed in the embodiment of the present utility model;

[0018] Figure 3 It is a schematic structural diagram of a crankshaft and a flywheel housing disclosed in an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the use of a universal screw hole disclosed in an embodiment of the present utility model;

[0020] Figure 5 It is a structural schematic diagram of the gasket ring disclosed in the embodiment of the utility model.

[0021] Description of Reference Numerals

[0022] 1. Flywheel body; 11. Boss; 12. First bevel; 13. Buffer platform; 14. Second bevel; 15. Flywheel edge; 2. Universal screw hole; 3. Single screw hole; 4. Spline screw hole; 5. Groove; 6. Gasket; 61. Protrusion; 62. Loading and unloading hole; 7. Exhaust and oil drain hole; 8. Crankshaft; 81. Crankshaft screw hole; 9. Flywheel housing. DETAILED DESCRIPTION

[0023] In this utility model, unless otherwise indicated, directional terms such as "upper," "lower," "left," "right," "inner," and "outer" are used to indicate directions or positional relationships for the sole purpose of facilitating the description of this utility model and simplifying the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] In order to solve the problem in the prior art that universal components of different models have the same circumferential distribution of screw holes, and the distribution circle diameters are relatively close, which leads to the overlap of the screw hole distribution positions, the utility model provides a universal flywheel, including: a flywheel body 1, the flywheel body 1 is provided with a plurality of circumferentially spaced circular universal screw holes 2 corresponding to the crankshaft screw holes 81 on the crankshaft 8, the crankshaft bolts pass through the universal screw holes 2 and can be connected with the crankshaft screw holes 81 with different distribution circle diameters, the crankshaft bolts match the crankshaft screw holes 81, the diameter of the universal screw holes 2 is set to be larger than the diameter of the crankshaft screw holes 81, and larger than the diameter of the crankshaft bolt rod, and smaller than the diameter of the crankshaft bolt head; a circular boss 11 is provided on the radial outside of the universal screw hole 2 of the flywheel body 1, the boss 11 is used to be sleeved on the outside of the crankshaft 8, and the inner diameter of the boss 11 matches the outer diameter of the crankshaft 8.

[0025] When testing an engine, the crankshaft 8 and the flywheel body 1 need to be connected together. The crankshaft bolt passes through the screw hole on the flywheel body 1 and the crankshaft screw hole 81 to connect the crankshaft 8 and the flywheel body 1 together. When the distribution circle diameters of the crankshaft screw holes 81 of different engine models are relatively close, the distribution positions of the crankshaft screw holes 81 with different distribution circle diameters overlap. Therefore, the screw holes with relatively close distribution circle diameters are connected together on the flywheel body 1 to form a larger circular universal screw hole 2. Figure 1 and Figure 2As shown, the flywheel body 1 is provided with a plurality of circular universal screw holes 2 arranged at intervals in the circumferential direction corresponding to the crankshaft screw holes 81 on the crankshaft 8. The diameter of the universal screw hole 2 is larger than the diameter of the crankshaft screw hole 81. The crankshaft bolt can pass through the universal screw hole 2 to connect with the crankshaft screw holes 81 with different distribution circle diameters. In actual operation, Figure 4 As shown, the side of the universal screw hole 2 close to the center of the flywheel body 1 is the inner side, and the side away from the center of the flywheel body 1 is the outer side. When the crankshaft bolt is installed in the universal screw hole 2 at a position close to the inner side and tangent to the inner side of the universal screw hole 2, it is suitable for the crankshaft screw hole 81 with a smaller distribution circle diameter; when the crankshaft bolt is installed in the universal screw hole 2 at a position close to the outer side and tangent to the outer side of the universal screw hole 2, it is suitable for the crankshaft screw hole 81 with a larger distribution circle diameter; when the crankshaft bolt is installed in the universal screw hole 2 at a position close to the side and tangent to the side of the universal screw hole 2, it is suitable for the crankshaft screw hole 81 with any distribution circle diameter between the smaller distribution circle diameter and the larger distribution circle diameter. In addition, the crankshaft bolt matches the crankshaft screw hole 81, and the diameter of the universal screw hole 2 is larger than the diameter of the crankshaft bolt rod and smaller than the diameter of the crankshaft bolt head, thereby ensuring the stability of the connection between the crankshaft bolt and the crankshaft screw hole 81.

[0026] During connection, the boss 11 is placed outside the crankshaft 8 so that the centers of the crankshaft 8 and the flywheel body 1 coincide with each other, and then the crankshaft bolt is used to connect the crankshaft 8 and the flywheel body 1 together through the universal screw hole 2. Since the diameter of the universal screw hole 2 is larger than the diameter of the crankshaft bolt rod, there will be a gap. However, the boss 11 is used to make the centers of the crankshaft 8 and the flywheel body 1 coincide with each other. Even if there is a gap in the universal screw hole 2, the crankshaft bolt will not shift during the engine testing process, and the connection between the crankshaft 8 and the flywheel body 1 is stable. Therefore, through the above arrangement, the flywheel body 1 can be used in the case where the distribution circle diameters of the crankshaft screw holes 81 of different models of engines are relatively close. When testing different models of engines with relatively close distribution circle diameters of the crankshaft screw holes 81, only one flywheel can be used to match multiple engines.

[0027] In some embodiments, as Figure 1 As shown, the flywheel body 1 is also provided with a plurality of single screw holes 3 spaced apart in the circumferential direction. The single screw holes 3 are located on the inner side of the boss 11. The distribution circle diameter of the single screw holes 3 is different from the distribution circle diameter of the universal screw holes 2. It can be smaller than the distribution circle diameter of the universal screw holes 2 or larger than the distribution circle diameter of the universal screw holes 2. The distribution circle diameter of the single screw holes 3 is also the same as the distribution circle diameter of the crankshaft screw holes 81, and the single screw holes 3 correspond one-to-one with the crankshaft screw holes 81. For screw holes with a distribution circle diameter that differs greatly from the universal screw holes 2, they are separately provided as single screw holes 3. The single screw holes 3 correspond one-to-one with the crankshaft screw holes 81. The crankshaft bolts pass through the single screw holes 3 and the crankshaft screw holes 81 to connect the flywheel body 1 and the crankshaft 8 together.

[0028] In some embodiments, as Figure 1 and Figure 2 As shown, the universal screw hole 2 partially overlaps with the single screw hole 3, and the universal screw hole 2 and the single screw hole 3 share the overlapping portion and are connected through the overlapping portion. When the difference in the distribution circle diameters of the universal screw hole 2 and the single screw hole 3 is small, the distribution positions will overlap. At this time, holes are opened according to the actual conditions of the universal screw hole 2 and the single screw hole 3, and the overlapping portion is shared and connected through the overlapping portion. When the crankshaft screw hole 81 corresponds to the distribution circle diameter of the universal screw hole 2, the universal screw hole 2 is used to connect the flywheel body 1 and the crankshaft 8 together; when the crankshaft screw hole 81 and the single screw hole 3 have the same distribution circle diameter, the universal screw hole 2 is used to connect the flywheel body 1 and the crankshaft 8 together. Of course, when the distribution circle diameters of the universal screw hole 2 and the single screw hole 3 differ greatly, the universal screw hole 2 and the single screw hole 3 may also have no overlapping portion, and the single screw hole 3 may also be set on the inner side of the universal screw hole 2.

[0029] In some embodiments, as Figure 1 and Figure 2 As shown, the universal screw hole 2 and the single screw hole 3 are distributed at different positions in the circumferential direction of the flywheel body 1 . Figure 1 and Figure 2 The universal screw holes 2 and the single screw holes 3 are evenly distributed circumferentially around the flywheel body 1. There are ten universal screw holes 2 and eight single screw holes 3, so their circumferential distribution positions are different. The circumferential distribution positions of the universal screw holes 2 and the single screw holes 3 are determined by the circumferential distribution positions of the crankshaft screw holes 81, and their number is also determined by the number of crankshaft screw holes 81. These can be set based on the actual crankshaft screw holes 81 of the engine to be tested. If the crankshaft screw holes 81 are unevenly distributed circumferentially, the universal screw holes 2 and the single screw holes 3 will also be unevenly distributed circumferentially.

[0030] In some embodiments, as Figure 1 and Figure 5 As shown, a backing ring 6 is sleeved within the boss 11. The thickness of the backing ring 6 is the same as the height of the boss 11. A protrusion 61 is formed on the outer circumference of the backing ring 6, and a groove 5 is formed on the boss 11 to match the protrusion 61. The backing ring 6 can be sleeved onto the outside of the crankshaft 8, and the inner diameter of the backing ring 6 matches the outer diameter of the crankshaft 8. Since the outer diameters of crankshafts 8 vary for different engine models, the inner diameter of the boss 11 is set to match the outer diameter of the crankshaft 8 with the largest diameter. Backing rings 6 of different widths are sleeved within the boss 11, and the inner diameter of the boss 11 is adjusted to match the outer diameter of the crankshaft 8. After engine testing is completed, the flywheel body 1 is removed. To prevent the backing ring 6 from remaining outside the crankshaft 8, a protrusion 61 is formed on the outer circumference of the backing ring 6, and a groove 5 is formed on the boss 11 to match the protrusion 61, allowing the backing ring 6 to be removed along with the flywheel body 1. In order to make the connection between the boss 11 and the gasket 6 more stable, at least two protrusions 61 are provided on the outer circumference of the gasket 6 .

[0031] In some embodiments, as Figure 5 As shown, the backing ring 6 is provided with a loading and unloading hole 62. After the flywheel body 1 and the backing ring 6 are removed together, a tool such as a screwdriver is used to extend into the loading and unloading hole 62 to facilitate the removal of the backing ring 6 from the flywheel body 1.

[0032] In some embodiments, as Figure 1 As shown, the flywheel body 1 extends radially outward from the boss 11 toward the side opposite to the boss 11 to form an inclined surface. Figure 3 As shown, during the engine test, the outer side of the crankshaft 8 is the flywheel housing 9, and there are other components on the flywheel housing 9 ( Figure 3 (not shown) In order to prevent the flywheel body 1 from contacting the flywheel housing 9, the flywheel body 1 is tilted and extended in a direction away from the crankshaft 8 to form an inclined surface.

[0033] In some embodiments, as Figure 1 As shown, the inclined surfaces include a first inclined surface 12, a buffer platform 13, and a second inclined surface 14, which are arranged radially outward from the boss 11. The flywheel body 1 is provided with two levels of inclined surfaces: the first inclined surface 12 and the second inclined surface 14. The buffer platform 13 is provided between the first inclined surface 12 and the second inclined surface 14, thereby increasing the strength of the entire flywheel body 1.

[0034] like Figure 1 As shown, on the flywheel body 1, the flywheel edge 15 also forms a boss that protrudes toward the side opposite to the boss 11, maintaining the weight and counterweight of the entire flywheel body 1. The flywheel body 1 is also provided with an oil and air discharge hole 7 for draining oil and air after being installed on the crankshaft 8.

[0035] In some embodiments, the engine test rig includes a crankshaft 8 and a flywheel of the general type described above.

[0036] In some embodiments, the boss 11 is sleeved on the outside of the crankshaft 8, and the crankshaft bolt passes through the universal screw hole 2 and the crankshaft screw hole 81 to connect the crankshaft 8 and the universal flywheel together.

[0037] like Figure 1 and Figure 2As shown, the flywheel body 1 is further provided with a spline screw hole 4 for connecting a spline, the back surface (the surface provided with the boss 11) of the flywheel body 1 is connected with the crankshaft 8, and the front surface is connected with the spline. The spline is provided with screw holes corresponding to the general screw hole 2, the single screw hole 3 and the spline screw hole 4 on the flywheel body 1, the spline is connected with the flywheel body 1 through the spline screw hole 4 on the flywheel body 1, and is sequentially connected with the flywheel body 1 and the crankshaft 8 through the general screw hole 2 or the single screw hole 3 and the crankshaft screw hole 81. In testing, different models of crankshafts 8 of different engines are sequentially connected with the flywheel body 1 and the spline. Since the same flywheel body 1 is suitable for crankshaft screw holes 81 with different distribution circle diameters, different crankshaft screw holes 81 in the circumferential direction and crankshafts 8 with different outer diameters, only one flywheel body 1 and the spline corresponding to the flywheel body 1 are used in testing to test multiple engines, thereby reducing the number of flywheels and the floor area, and saving the time for selecting flywheels.

[0038] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited thereto. Within the technical concept range of the utility model, the technical scheme of the utility model can be simply modified in various ways, including that various specific technical features are combined in any suitable way. In order to avoid unnecessary repetition, the utility model will not further describe various possible combination ways. However, these simple modifications and combinations should also be regarded as the disclosed contents of the utility model and belong to the protection range of the utility model.

Claims

1. A universal flywheel, characterized in that: The invention comprises a flywheel body (1), wherein the flywheel body (1) is provided with a plurality of circumferentially spaced circular universal screw holes (2) corresponding to the crankshaft screw holes (81) on the crankshaft (8), and the crankshaft bolts pass through the universal screw holes (2) and can be connected with the crankshaft screw holes (81) of different distribution circle diameters, and the crankshaft bolts match the crankshaft screw holes (81), and the diameter of the universal screw holes (2) is set to be larger than the diameter of the crankshaft screw holes (81), and larger than the diameter of the crankshaft bolt rod, and smaller than the diameter of the crankshaft bolt head; the flywheel body (1) is provided with a circular boss (11) located radially outside the universal screw holes (2), and the boss (11) is used to be sleeved outside the crankshaft (8), and the inner diameter of the boss (11) matches the outer diameter of the crankshaft (8).

2. The universal flywheel according to claim 1, characterized in that: The flywheel body (1) is further provided with a plurality of single screw holes (3) spaced apart in the circumferential direction. The single screw holes (3) are located on the inner side of the boss (11). The distribution circle diameter of the single screw holes (3) is different from the distribution circle diameter of the universal screw holes (2) and is the same as the distribution circle diameter of the crankshaft screw holes (81). Furthermore, the single screw holes (3) correspond to the crankshaft screw holes (81) one by one.

3. The universal flywheel according to claim 2, characterized in that: The universal screw hole (2) partially overlaps with the single screw hole (3), and the universal screw hole (2) and the single screw hole (3) share the overlapping portion and are connected through the overlapping portion.

4. The universal flywheel according to claim 2, characterized in that: The universal screw hole (2) and the single screw hole (3) are distributed at different positions in the circumferential direction of the flywheel body (1).

5. The universal flywheel according to claim 1, characterized in that: A backing ring (6) is sleeved inside the boss (11), the thickness of the backing ring (6) is the same as the height of the boss (11), a protrusion (61) is provided on the outer periphery of the backing ring (6), and a groove (5) matching the protrusion (61) is formed on the boss (11), the backing ring (6) can be sleeved outside the crankshaft (8), and the inner diameter of the backing ring (6) matches the outer diameter of the crankshaft (8).

6. The universal flywheel according to claim 5, characterized in that: The backing ring (6) is provided with a loading and unloading hole (62).

7. The universal flywheel according to claim 1, characterized in that: The flywheel body (1) extends radially outward from the boss (11) and is inclined toward the side opposite to the boss (11) to form an inclined surface.

8. The universal flywheel according to claim 7, characterized in that: The inclined surface comprises a first inclined surface (12), a buffer platform (13), and a second inclined surface (14) which are sequentially arranged radially outward from the boss (11).

9. An engine testing device, characterized in that: The engine testing device comprises a crankshaft (8) and a universal flywheel according to any one of claims 1 to 8.

10. The engine testing device according to claim 9, characterized in that: The boss (11) is sleeved outside the crankshaft (8), and the crankshaft bolt passes through the universal screw hole (2) and the crankshaft screw hole (81) to connect the crankshaft (8) and the universal flywheel together.

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