CN117267311A - Unidirectional coupling shock absorber of generator with unidirectional improvement of friction damping - Google Patents

Unidirectional coupling shock absorber of generator with unidirectional improvement of friction damping Download PDF

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Publication number
CN117267311A
CN117267311A CN202311434384.3A CN202311434384A CN117267311A CN 117267311 A CN117267311 A CN 117267311A CN 202311434384 A CN202311434384 A CN 202311434384A CN 117267311 A CN117267311 A CN 117267311A
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CN
China
Prior art keywords
friction
wall
generator
unidirectional
friction plate
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Pending
Application number
CN202311434384.3A
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Chinese (zh)
Inventor
王超
吴晓亮
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Litens Automotive Suzhou Co ltd
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Litens Automotive Suzhou Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Litens Automotive Suzhou Co ltd filed Critical Litens Automotive Suzhou Co ltd
Priority to CN202311434384.3A priority Critical patent/CN117267311A/en
Publication of CN117267311A publication Critical patent/CN117267311A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/13121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses characterised by clutch arrangements, e.g. for activation; integrated with clutch members, e.g. pressure member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/20—Freewheels or freewheel clutches with expandable or contractable clamping ring or band
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/133—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses using springs as elastic members, e.g. metallic springs
    • F16F15/1337—Torsional springs, e.g. torsion bar or torsionally-loaded coil springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/139—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses characterised by friction-damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2232/00—Nature of movement
    • F16F2232/02—Rotary

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Pulleys (AREA)

Abstract

The invention provides a unidirectional coupling shock absorber of a generator with unidirectional improved friction damping, which comprises a belt pulley, a shaft hub and friction plates, wherein the shaft hub is arranged in the belt pulley, a friction plate mounting groove is formed in the inner wall of the belt pulley, an annular boss is arranged at one end of the shaft hub, an arc-shaped boss is arranged on the outer wall of the annular boss, and the outline of the outer wall of the arc-shaped boss is an involute shape taking the outer circumference of the annular boss as a base circle; the friction plate is the same with convex boss quantity, and the outer wall is close to the back part embedding friction plate mounting groove, forms the clearance between anterior part and the band pulley inner wall, and the terminal butt is in convex boss front end face, and the friction plate medial surface is close to the back part and is laminated with the boss outer wall, and the part of being close to is laminated with convex boss outer wall. The friction element is improved, and the friction force between the shaft hub and the belt wheel is automatically increased in the acceleration stage of the engine, so that the rotation speed amplitude when the shaft hub and the belt wheel resonate is reduced; in the engine deceleration stage, the friction force between the shaft hub and the belt wheel is automatically reduced, and the shaft hub and the belt wheel are ensured to be fully separated.

Description

Unidirectional coupling shock absorber of generator with unidirectional improvement of friction damping
Technical Field
The invention relates to the technical field of vibration absorbers, in particular to a generator unidirectional coupling vibration absorber with unidirectional improvement of friction damping.
Background
Engine front end accessory drive system (FEAD, shorthand for english Front End Accessory Drive). The main function is that a part of output power of the engine crankshaft is transmitted to accessories of the transmitter, such as a fan, a water pump, a generator, an air conditioner compressor and the like, through a belt, so that the normal operation of the automobile is ensured. Wherein the output shaft of the generator is coaxially connected with the generator belt wheel.
The rotation speed of the generator is 2-3 times of the rotation speed of the engine, has larger rotation inertia, and works continuously for a long time along with the engine, and is extremely sensitive to the rotation speed fluctuation of the engine. Under the working conditions of rapid acceleration and rapid deceleration, the fluctuation of the rotation speed causes the fluctuation of the rotor of the generator to be extremely obvious, and the impact on the whole gear train is also the largest, and the fundamental reasons of belt shake, noise, slipping and large-amplitude swing of the tensioner arm are most of the cases. To address the impact of the generator on the overall train when the engine speed is abrupt, the application of generator unidirectional coupling shock absorbers (Overrunning Alternator Decoupler, hereinafter abbreviated OAD) is of increasing interest. The principle is that the rotational inertia of the generator is isolated from the whole gear train, and the running stability of the belt transmission system is improved.
The OAD adds a one-way clutch and a torsion spring between the originally rigidly connected generator pulley and the motor rotor to make the two become elastically connected. When the engine is in an acceleration working condition or a steady-state uniform working condition, the rotating speed of the outer belt pulley is larger than that of the motor rotor, the OAD clutch is in an attracting state, and torsion is transmitted to the motor rotor through the motor wheel shaft and the torsion spring to drive the motor rotor to work. The torsion spring has the function of changing the rigid connection of the belt pulley and the rotor into flexible connection, so as to reduce torsional vibration (vibration isolation and vibration reduction between the belt pulley and the rotor) transmitted to the generator by the engine; when the engine is in a deceleration working condition, the rotating speed of the outer belt wheel is smaller than that of the motor rotor, the one-way clutch of the OAD acts to separate the outer belt wheel from the motor rotor, and high-rotating-speed impact of the motor rotor cannot be transmitted to the outer belt wheel, so that NVH performance of the system is improved.
The OAD mainly comprises a ball bearing, a belt pulley, a clutch assembly, a vibration isolation spring and a shaft hub, wherein the ball bearing is used for bearing all radial loads of the belt pulley of the generator; the belt wheel is used for transmitting the torque of the driving leather to the generator; the clutch assembly is a core part of the OAD and is used for realizing power transmission, and the belt wheel is separated from the generator shaft when the clutch assembly is overrun; the vibration isolation spring has the function of transmitting power from the clutch assembly to the generator shaft, the diameter of the vibration isolation spring is large during forward running, the friction force between the outer wall of the clutch assembly and the inner wall of the belt wheel is increased, and the clutch assembly and the shaft hub are both provided with a clamping groove to limit the position of the vibration isolation spring; the purpose of the hub is to secure the OAD to the generator shaft. The clutch assembly comprises a clutch spring, and torque on the belt pulley is transmitted to the vibration isolation spring in an engine acceleration stage so as to drive the shaft hub; and separating the belt pulley from the vibration isolation spring and the shaft hub in the engine deceleration stage, so that the shaft hub can freely rotate.
From the construction of the OAD, it can be seen that the isolation spring is connected in series between the clutch assembly and the hub, and has mainly two functions:
(1) Isolation of torsional vibrations: the torque of the engine is transmitted to the rotor of the generator through the driving belt, the belt pulley, the clutch assembly, the vibration isolation spring and the shaft hub, and the generator is driven to work normally. When the engine accelerates, the clutch spring in the clutch assembly expands under the action of the belt pulley to further connect the inner wall of the belt pulley and the vibration isolation spring, and meanwhile, the vibration isolation spring pushes the shaft hub to drive the generator to operate, and the rotating speed of the generator rotor cannot accelerate synchronously with the engine due to the existence of the vibration isolation spring, so that the function of isolating torsional vibration is realized.
(2) Unidirectional overrunning function: when the driving part drives the driven part, the driving part and the driven part rotate together, and if the rotating speed of the driven part exceeds that of the driving part, the driving part and the driven part are separated, and the driven part can rotate freely. When the engine is decelerating, such as during a gear shift, the generator turns the tight side of the generator driving belt into a loose side because of the large rotor inertia, and in severe cases, the belt and the belt pulley slip, thereby generating noise and increasing belt wear. After the OAD is used in the wheel system, the generator rotor drives the thrust plate through the hub when the engine is decelerated, the thrust plate pushes the clutch assembly, the diameter of the clutch spring in the clutch assembly is reduced, the hub, the vibration isolation spring and the inner wall of the belt pulley are separated, the belt pulley is decelerated along with the driving belt, and the generator rotor still keeps rotating at a higher rotating speed, so that the unidirectional overrunning function is realized.
The conventional OAD has the following problems: in some application scenes, the natural frequency of the OAD is close to the excitation frequency from the generator, resonance is easily generated between the OAD and the generator in the acceleration stage of the engine, so that the OAD is repeatedly switched between a torsional vibration isolation function and a unidirectional overrunning function, the rotating speed of the belt wheel relative to the shaft hub is continuously suddenly changed in a short time, larger rotating speed amplitude is generated, normal transmission of torque between the OAD and the generator is affected, and the stability of the FEAD is reduced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: in order to overcome the defects in the prior art, the invention provides the unidirectional coupling shock absorber of the generator with unidirectional improved friction damping, and in the acceleration stage of the engine, the structure and the relative position of the shaft hub and the friction plate are utilized to unidirectional automatically increase the friction damping; in the engine deceleration stage, the friction damping is automatically reduced by utilizing the structures and the relative positions of the shaft hub and the friction plate.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a unidirectional coupling shock absorber of generator that friction damping is unidirectionally improved, includes band pulley, boss and friction disc, the boss sets up in the centre bore of band pulley, processing has the friction disc mounting groove on the centre bore inner wall of band pulley, the one end processing of boss has annular boss, be equipped with a plurality of convex bosss on the outer wall of annular boss, every convex boss outer wall profile is the involute shape with annular boss outer circumference as the base circle, the quantity and the convex boss quantity of friction disc are the same, the part that the outer wall face of friction disc is back is equipped with the supporting region, the supporting region embedding forms the holding surface in the friction disc mounting groove, and the part that the outer wall face is close to before forms the clearance with the band pulley centre bore inner wall, and on the terminal butt lean on the preceding terminal face of the convex boss of back, the preceding convex boss of friction disc front end extends to a convex boss, and the part and the laminating of the medial surface of friction disc is close to the boss outer wall face, and this part medial shape is complementary with convex boss outer wall face shape.
Further, the roughness of the outer wall surface of the friction plate is larger than that of the inner wall surface.
Further, the number of the arc-shaped bosses and the friction plates is four, and the arc-shaped bosses and the friction plates are uniformly distributed along the circumferential direction.
Furthermore, the joint between the front part and the rear part of the inner side surface of the friction plate is provided with a fillet transition.
Furthermore, the front end of the circular arc-shaped boss is provided with a fillet transition.
Further, the curvature of the outer wall of the supporting area is the same as that of the friction plate mounting groove.
Further, the friction plate is made of elastic materials.
Further, the novel pulley comprises a torsion spring, a bushing, a clutch spring, a thrust plate, a gasket and a bearing, wherein the torsion spring, the bushing and the clutch spring sleeve are arranged between the hub and the pulley from inside to outside, the upper end of the torsion spring is connected with the annular boss, the lower end of the torsion spring is connected with the thrust plate, the lower ends of the hub and the pulley are connected through the bearing, and the gasket is arranged between the thrust plate and the bearing.
Further, a torsion spring mounting groove is formed in one face, facing the shaft hub, of the annular boss and is used for nesting a torsion spring, and a spigot is formed in the torsion spring mounting groove and is abutted against the tail end of the torsion spring.
Further, the center of the shaft hub penetrates through, and internal threads and an internal hexagonal structure are respectively machined at two ends of the inner wall and are used for being connected with an output shaft of the generator.
The beneficial effects of the invention are as follows: according to the generator unidirectional coupling shock absorber with the unidirectional improved friction damping, provided by the invention, a rotary friction element (namely a friction ring nested between a shaft hub and a belt pulley in the traditional OAD) of the OAD is redesigned, the friction force between the shaft hub and the belt pulley is automatically increased in an engine acceleration stage, and the rotation speed amplitude when the shaft hub and the belt pulley resonate is reduced by increasing the friction damping in a vibration system; in the engine deceleration stage (one-way overrun), the friction between the shaft hub and the belt wheel is automatically reduced, and the two are ensured to be fully separated.
Drawings
The invention is further described below with reference to the drawings and examples.
Fig. 1 is a schematic side view of a unidirectional coupling damper of a generator according to the present invention.
FIG. 2 is a schematic cross-sectional view of A-A in FIG. 1.
Fig. 3 is a schematic perspective view of the section in fig. 2.
Fig. 4 is a schematic top view of fig. 1.
Fig. 5 is a schematic cross-sectional structure of F-F in fig. 1.
Fig. 6 is a schematic perspective view of the hub and friction plate.
FIG. 7 is a schematic side elevational view of the hub and friction plate.
Fig. 8 is a schematic cross-sectional structure of C-C in fig. 7.
Fig. 9 is a schematic bottom view of the hub of fig. 7.
Fig. 10 is a schematic structural view of the friction plate.
Fig. 11 is a schematic perspective view of a friction plate.
Fig. 12 is a schematic cross-sectional structure of the pulley.
Fig. 13 is a schematic diagram of the operating principle of the engine acceleration phase.
Fig. 14 is a schematic diagram of the operating principle of the engine deceleration phase.
In the figure: 1. pulley, 1.1, friction disc mounting groove, 2, axle hub, 2.1, annular boss, 2.2, convex boss, 2.3, torsion spring mounting groove, 2.4, tang, 2.5, fillet, 3, torsion spring, 4, friction disc, 4.1, end, 4.2, support area, 4.3, front end, 4.4, medial surface, 4.5, outer wall, 4.6, fillet, 5, bushing, 6, clutch spring, 7, thrust plate, 8, gasket, 9, bearing, 10, gap, 11, base circle, 12, involute, 13, supporting surface.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.
As shown in fig. 1-3, the unidirectional coupling damper of the generator with unidirectional improved friction damping comprises a belt pulley 1, a shaft hub 2, a friction plate 4, a torsion spring 3, a bushing 5, a clutch spring 6, a thrust plate 7, a gasket 8 and a bearing 9, wherein the torsion spring 3, the bushing 5 and the clutch spring 6 are sleeved between the shaft hub 2 and the belt pulley 1 from inside to outside, the upper end of the torsion spring 3 is connected with an annular boss 2.1, the lower end of the torsion spring is connected with the thrust plate 7, the lower ends of the shaft hub 2 and the belt pulley 1 are connected through the bearing 9, and the gasket 8 is arranged between the thrust plate 7 and the bearing 9. The torsion spring 3, the bushing 5, the clutch spring 6, the thrust plate 7 and the gasket 8 are elements in the traditional OAD, and have the same structure and the same function. Wherein the torsion spring 3 transmits torque and damps vibration between the pulley 1 and the hub 2; friction plate 4 provides friction torque and damping as hub 2 rotates; the clutch spring 6 connects the thrust plate 7 and the inner wall of the pulley 1 to transmit torque during the engine acceleration phase and disconnects the thrust plate 7 from the inner wall of the pulley 1 to isolate the generator load and moment of inertia during the engine deceleration phase as described above; a spacer 8 is located between the bearing 9 and the thrust plate 7 for connecting the hub 2 and the thrust plate 7 and limiting the bearing 9.
As shown in fig. 2, the hub 2 is disposed in a central hole of the pulley 1, as shown in fig. 12, a friction plate 4 mounting groove 1.1 is machined on the inner wall of the central hole of the pulley 1, and the friction plate mounting groove 1.1 is a circular groove. As shown in fig. 5-9, the center of the hub 2 is penetrated, and both ends of the inner wall are respectively provided with an internal thread and an internal hexagonal structure for connection and disassembly (conventional structure and installation mode) with the output shaft of the generator. An annular boss 2.1 is machined at one end of the shaft hub 2, a torsion spring mounting groove 2.3 is machined on one face, facing the shaft hub 2, of the annular boss 2.1 and used for nesting the torsion spring 3, and a spigot 2.4 is machined in the torsion spring mounting groove 2.3 and is abutted to the tail end of the torsion spring 3. The outer wall of the annular boss 2.1 is provided with a plurality of arc-shaped bosses 2.2, the outline of the outer wall of each arc-shaped boss 2.2 is in an involute 12 shape taking the outer circumference of the annular boss 2.1 as a base circle 11, the front end of each arc-shaped boss 2.2 is provided with a round corner 2.5 for transition, stress concentration is avoided, and the friction plate 4 can conveniently move on the shaft hub 2. The number of the friction plates 4 is the same as that of the circular arc-shaped bosses 2.2, the number of the circular arc-shaped bosses 2.2 is variable, the design can be carried out according to the requirement, and in the embodiment, the number of the circular arc-shaped bosses 2.2 and the friction plates 4 is preferably four and are uniformly distributed along the circumferential direction. As shown in fig. 10 and 11, the friction plate 4 is in a tooth shape as a whole, a supporting area 4.2 for supporting the hub 2 and the pulley 1 is machined at a part of the outer wall surface 4.5 of the tooth shape, the supporting area 4.2 is in a circular arc protrusion shape, and the outer wall curvature of the supporting area 4.2 is the same as the curvature of the mounting groove 1.1 of the friction plate 4 so as to ensure that the two parts are in full contact for transmitting hub force between the pulley 1 and the hub 2. The supporting area 4.2 is embedded into the mounting groove 1.1 of the friction plate 4 to form a supporting surface 13, a gap 10 is formed between the front part of the outer wall surface 4.5 and the inner wall of the central hole of the belt wheel 1, and the tail end 4.1 is abutted against the front end surface of the arc-shaped boss 2.2 adjacent to the rear part.
The inner side surface 4.4 of the friction plate 4 is partially attached to the outer wall surface 4.5 of the shaft hub 2, the front end 4.3 of the friction plate 4 extends to the front of a circular arc boss 2.2, the tooth-shaped inner wall takes the outer wall of the circular arc boss 2.1 in the shaft hub 2 as a base circle 11, an involute 12 circular arc incision is processed, the circular arc incision of the front part is attached to the outer wall surface of the circular arc boss 2.2, and the shape of the inner side surface 4.4 of the part is complementary with that of the outer wall surface of the circular arc boss 2.2. The roughness of the outer wall surface of the friction plate 4 is larger than that of the inner wall surface. The joint between the front part and the rear part of the inner side surface 4.4 of the friction plate 4 is provided with a round corner 4.6 for transition (namely, the intersection area of the involute 12 and the profile of the base circle 11 is rounded), so that the friction ring can move on the shaft hub 2 conveniently, and stress concentration is avoided. The rounded ends of the cutouts facilitate movement of the friction ring on the hub 2 and avoid stress concentrations. The friction plate 4 is made of elastic material, so that elastic deformation is easy to occur; the roughness of the outer wall of the friction plate 4 is larger than that of the inner wall by polishing and other means.
Mounting relationship: as shown in fig. 5, before working, the friction plate 4 is completely jointed with the shaft hub 2, the involute 12 contours of the friction plate and the shaft hub are jointed, and the base circle 11 contour is also jointed; the supporting surface 13 of the friction ring is attached to the circular groove on the inner wall of the belt pulley 1, and the hub force (caused by the belt pulling the belt pulley 1) is transmitted between the belt pulley 1 and the hub 2 at any time, so that the function of supporting the hub 2 is realized; the tail end of the friction ring plane is abutted against the arc-shaped boss of the shaft hub 2; and a gap 10 is formed between the rest part of the friction ring and the circular groove on the inner wall of the belt wheel 1.
Working principle:
in the engine acceleration stage, as shown in fig. 13, the hub 2 rotates counterclockwise relative to the pulley 1, the two support surface 13 areas are shown to have friction force due to the existence of hub force, the friction force between the friction plate 4 and the pulley 1 is larger than the friction force between the friction plate 4 and the hub 2 due to the fact that the roughness of the outer wall of the friction plate 4 is larger than that of the inner wall, the relative position of the friction plate 4 and the pulley 1 is unchanged, the hub 2 rotates counterclockwise relative to the friction plate 4, meanwhile, the involute 12 outline of the hub 2 presses the involute 12 outline of the friction ring outwards, the tail end of the friction plate 4 moves outwards (elastically deforms) with the support area 4.2 on the friction plate 4 as a supporting point and is in contact with the pulley 1, friction force is generated between the hub, the friction plate 4 and the pulley 1, the force of the hub 2 pressing the friction plate 4 is increased, the normal pressure of the contact surface is increased, the friction force between the hub, the friction plate 4 and the pulley 1 is increased, and the friction damping of the whole vibration system is increased to reduce the rotation speed amplitude at resonance.
As shown in fig. 14, in the engine deceleration stage, the hub 2 rotates clockwise relative to the pulley 1, the friction plate 4 rotates synchronously with the hub 2, the hub 2 does not press the friction plate 4 any more, the friction plate 4 is restored, the tail end of the friction plate 4 is separated from the pulley 1, friction force between the friction plate 4 and the pulley 1 is reduced, and the hub 2 is ensured to be sufficiently separated from the pulley 1.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (10)

1. The utility model provides a unidirectional coupling shock absorber of generator that friction damping one-way improves which characterized in that: the friction plate mounting groove is formed in the inner wall of the central hole of the belt wheel, an annular boss is machined at one end of the shaft hub, a plurality of arc-shaped bosses are arranged on the outer wall of the annular boss, the outline of the outer wall of each arc-shaped boss is an involute shape taking the outer circumference of the annular boss as a base circle, the number of the friction plates is identical to that of the arc-shaped bosses, a supporting area is arranged on the rear part of the outer wall surface of the friction plate, the supporting area is embedded into the friction plate mounting groove, a gap is formed between the front part of the outer wall surface and the inner wall of the central hole of the belt wheel, the tail end of the friction plate abuts against the front end face of an adjacent arc-shaped boss at the rear part of the friction plate, the front end of the friction plate extends towards the front face of the arc-shaped boss, the rear part of the inner side of the friction plate abuts against the outer wall surface of the shaft hub, and the front part of the friction plate abuts against the outer wall surface of the arc-shaped boss.
2. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 1, wherein: the roughness of the outer wall surface of the friction plate is larger than that of the inner wall surface.
3. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 1, wherein: the number of the arc-shaped bosses and the friction plates is four, and the arc-shaped bosses and the friction plates are uniformly distributed along the circumferential direction.
4. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 1, wherein: the joint between the front part and the rear part of the inner side of the friction plate is provided with a fillet transition.
5. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 1, wherein: the front end of the circular arc-shaped boss is provided with a fillet transition.
6. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 1, wherein: the curvature of the outer wall of the supporting area is the same as that of the friction plate mounting groove.
7. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 1, wherein: the friction plate is made of elastic materials.
8. The friction damped unidirectionally increasing generator unidirectionally coupled shock absorber according to any one of claims 1-7, wherein: the novel clutch spring comprises a pulley, and is characterized by further comprising a torsion spring, a bushing, a clutch spring, a thrust plate, a gasket and a bearing, wherein the torsion spring, the bushing and the clutch spring sleeve are arranged between a shaft hub and a belt pulley from inside to outside, the upper end of the torsion spring is connected with an annular boss, the lower end of the torsion spring is connected with the thrust plate, the lower ends of the shaft hub and the belt pulley are connected through the bearing, and the gasket is arranged between the thrust plate and the bearing.
9. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 8, wherein: the annular boss is processed on the one side towards the axle hub has torsion spring mounting groove for nested torsion spring, and the processing has tang and torsion spring terminal butt in the torsion spring mounting groove.
10. The generator unidirectional coupling shock absorber with unidirectional increase in friction damping of claim 8, wherein: the center of the shaft hub penetrates through, and the two ends of the inner wall are respectively provided with an internal thread and an internal hexagonal structure for being connected with an output shaft of the generator.
CN202311434384.3A 2023-10-31 2023-10-31 Unidirectional coupling shock absorber of generator with unidirectional improvement of friction damping Pending CN117267311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311434384.3A CN117267311A (en) 2023-10-31 2023-10-31 Unidirectional coupling shock absorber of generator with unidirectional improvement of friction damping

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