Vibration reduction assembly of centrifugal pendulum type dual-mass flywheel

Abstract

The invention discloses a vibration reduction assembly of a centrifugal pendulum type dual-mass flywheel, and belongs to the technical field of dual-mass flywheels. Four arc-shaped grooves are evenly distributed in the force transmission disc in the circumferential direction, annular tracks matched with the swing tracks of the pendulum bobs are arranged on the two sides of each arc-shaped groove, the two rollers are arranged in the annular tracks on the two sides of each arc-shaped groove respectively, and the two ends of each roller are rotationally connected with the corresponding pendulum bobs respectively. A second mass block is arranged between the two pendulum bobs and detachably connected with the two pendulum bobs through corresponding pins, the second mass block is arranged in the corresponding arc-shaped groove, and the elastic buffer block is embedded in the second mass block. According to the vibration reduction assembly of the centrifugal pendulum type dual-mass flywheel, through structural innovation, the problems that a traditional dual-mass flywheel is prone to resonance at the low rotating speed and insufficient in vibration reduction at the high rotating speed are effectively solved, efficient vibration isolation and vibration reduction in the full rotating speed domain are achieved, meanwhile, the service life of parts is prolonged, and the transmission performance is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of dual-mass flywheels, and in particular relates to a vibration reduction component of a centrifugal pendulum dual-mass flywheel. Background Art

[0002] Torsional vibration in the powertrain has always been a key concern in the automotive industry, directly impacting the smoothness of a vehicle's ride and the overall driving experience. Torsional vibration in a vehicle's powertrain originates from the engine and is transmitted to the transmission via the torsional vibration damper. This vibration can cause rumbling or unusual noises in the vehicle and increase wear on other components. Therefore, the torsional amplitude of the transmission input shaft is the primary factor in controlling torsional vibration throughout the entire powertrain. To address this issue, the single-mass flywheel damper was first invented, and later evolved into the more effective dual-mass flywheel damper.

[0003] The dual-mass flywheel consists of three main parts: the first mass, the second mass and the spring damping system. The first mass is connected to the crankshaft for torque transmission, the second mass is connected to the transmission through a clutch, and the spring damping vibration reduction system between the two mass blocks attenuates the torsional vibration of the engine crankshaft.

[0004] With the continuous development of engine technology, engines tend to be miniaturized and turbocharging technology is used extensively. These have greatly aggravated torsional vibration. The vibration isolation and vibration reduction effect of ordinary dual-mass flywheels has begun to weaken. In response to this situation, centrifugal pendulum shock absorber mechanisms have been used. This device uses centrifugal force and swinging effects to reduce mechanical vibrations to effectively alleviate the vibration impact caused by the rotation of the engine crankshaft. Summary of the Invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a vibration reduction assembly of a centrifugal pendulum dual-mass flywheel.

[0006] To achieve the above object, the present invention adopts the following technical solution: a centrifugal pendulum dual-mass flywheel vibration damping assembly, comprising a force transmission plate and four centrifugal pendulum vibration damper mechanisms; the force transmission plate is uniformly provided with four arc-shaped grooves along the circumference, and each arc-shaped groove is provided with a centrifugal pendulum vibration damper mechanism. Each of the centrifugal pendulum vibration absorber mechanisms comprises a pin, a second mass block, an elastic buffer block, two rollers and two pendulums; An annular track is provided on both sides of each arc-shaped groove that is adapted to the swing trajectory of the pendulum. Two rollers are respectively arranged in the annular tracks on both sides of the arc-shaped groove. The two ends of each roller are respectively rotatably connected to the corresponding pendulum. A second mass block is provided between the two pendulums and is detachably connected by a pin. The second mass block is arranged in the corresponding arc-shaped groove, and the elastic buffer block is embedded in the second mass block.

[0007] The force transmission plate and the arc spring assembly are combined to form the spring damping system of a traditional dual-mass flywheel. The layout of the arc groove matches the centrifugal pendulum shock absorber mechanism, so that the two can work together to achieve vibration isolation and vibration reduction.

[0008] The elastic buffer block is located at the contact surface between the second mass block and the arc-shaped groove of the force transmission plate. The elastic buffer block is made of elastic material and is used to buffer the collision between the centrifugal pendulum vibration absorber mechanism and the force transmission plate.

[0009] The two pendulums and the second mass block are both provided with connecting holes for use with pins. The pins pass through the corresponding connecting holes of the two pendulums and the second mass block, and the two pendulums and the second mass block are detachably connected by interference fit or threaded connection.

[0010] The second mass block is close to the outer edge of the force transmission disc in the radial direction to increase the moment of inertia.

[0011] The pendulum swings in the annular track through rollers on both sides. The swinging track is different because the two rollers are located in the annular track on both sides of the arc groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. Solve the low-speed resonance problem: When the centrifugal pendulum dual-mass flywheel is combined with a centrifugal pendulum vibration reduction component, the two rollers of the centrifugal pendulum have different motion trajectories. As a result, the swing trajectory and amplitude of the pendulum change with the speed rather than periodically. This breaks the original vibration frequency of the dual-mass flywheel and no longer resonates with the non-primary harmonic order excitation of the engine, effectively improving the vibration isolation and vibration reduction effect under low-speed conditions.

[0013] 2. Improve the upper limit of high-speed vibration reduction: In the high-speed range, the pendulum swings outward due to centrifugal force, driving the second mass block radially closer to the outer edge of the force transfer plate, increasing the moment of inertia, providing additional rotational inertia for the system, thereby absorbing more torsional vibration energy and increasing the upper limit of the dual-mass flywheel's vibration isolation and reduction.

[0014] 3. Achieve effective vibration isolation and vibration reduction across the entire speed range: While retaining the original dual-mass flywheel's ability to isolate and reduce torsional vibrations across the entire engine speed range, the centrifugal pendulum dual-mass flywheel incorporates the centrifugal force and swinging effects of a centrifugal pendulum damper. The combined effect of these two further optimizes the transmission performance between the engine and transmission, effectively isolating and reducing torsional vibrations across the entire engine speed range.

[0015] 4. Reduce parts fatigue loss: The elastic buffer block is embedded in the second mass block, located on the contact surface of the second mass block and the arc groove of the force transmission plate. It is made of elastic material and can buffer the collision between the second mass block and the force transmission plate during the swing process of the centrifugal pendulum shock absorber mechanism, thereby reducing parts fatigue loss and increasing the service life of parts.

[0016] 5. Ensure structural stability: The pin passes through the connecting holes of the two pendulums and the second mass block, and is detachably fixed by interference fit or threaded connection, thereby ensuring the structural stability of the centrifugal pendulum shock absorber mechanism during swinging and ensuring its normal operation.

[0017] 6. Optimized transmission performance: The force transmission plate features arc-shaped grooves evenly distributed along its circumference and circular tracks on both sides. Their curvature matches the roller's motion trajectory, guiding the pendulum to swing along a specific trajectory. This ensures that the movement of the centrifugal pendulum damper mechanism is synchronized with the engine speed. This, in conjunction with the spring damping system of a traditional dual-mass flywheel, achieves vibration isolation and reduction, optimizing the transmission performance between the engine and transmission.

[0018] In summary, the vibration reduction component of the centrifugal pendulum dual-mass flywheel effectively solves the problems of traditional dual-mass flywheels being prone to resonance at low speeds and insufficient vibration reduction at high speeds through structural innovation, achieves efficient vibration isolation and reduction across the entire speed range, and at the same time improves component life and transmission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the present invention; Figure 2 is a side view of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention. DETAILED DESCRIPTION

[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] This embodiment describes a centrifugal pendulum dual-mass flywheel vibration damping assembly, including a force transmission plate 1 and four centrifugal pendulum vibration damper mechanisms; the force transmission plate 1 is evenly distributed with four arc-shaped grooves along the circumference, each arc-shaped groove is provided with a centrifugal pendulum vibration damper mechanism, each of the centrifugal pendulum vibration damper mechanisms includes a pin 2, a second mass block 3, an elastic buffer block 4, two rollers 5 and two pendulums 6; each arc-shaped groove is provided with a circular track on both sides that is adapted to the swing trajectory of the pendulum 6 (the curvature radius of the track is equal to the swing radius of the pendulum 6 around the pin 2 to ensure pure rolling of the roller 5), and the two rollers 5 are respectively arranged on both sides of the arc-shaped groove. In the annular track on the side, the two ends of each roller 5 are respectively rotatably connected to the corresponding pendulum 6, and a second mass block 3 is provided between the two pendulums 6 and is detachably connected by a pin 2 (preferably, three groups of coaxially arranged connecting holes are opened on the two pendulums 6 and the second mass block 3 (preferably, the number of pins 2 is three), and the pin 2 passes through the connecting holes and is fixed by an interference fit or a threaded connection), the second mass block 3 is set in the corresponding arc-shaped groove, and the elastic buffer block 4 is embedded in the second mass block 3 (the elastic buffer block 4 is embedded in the groove of the second mass block 3 through a card slot (the depth of the card slot is adapted to the thickness of the buffer block)).

[0022] The force transmission disc 1 and the arc-shaped spring assembly form a spring damping system of a traditional dual-mass flywheel. The layout of the arc-shaped groove matches the centrifugal pendulum shock absorber mechanism, so that the two can work together to achieve vibration isolation and vibration reduction.

[0023] The elastic buffer block 4 is located at the contact surface between the second mass block 3 and the arc-shaped groove of the force transmission plate 1 . The elastic buffer block 4 is made of elastic material and is used to buffer the collision between the centrifugal pendulum vibration absorber mechanism and the force transmission plate 1 .

[0024] The two pendulums 6 and the second mass block 3 are both provided with connecting holes for use with the pin 2. The connecting holes on the two pendulums 6 and the second mass block 3 are coaxially arranged. The pin 2 passes through the corresponding connecting holes of the two pendulums 6 and the second mass block 3, and the two pendulums 6 and the second mass block 3 are detachably connected by interference fit or threaded connection.

[0025] The second mass block 3 is close to the outer edge of the force transmission disc 1 in the radial direction to increase the moment of inertia.

[0026] The pendulum 6 swings in the annular track through the rollers 5 on both sides. The swinging track is different because the two rollers 5 are respectively located in the annular track on both sides of the arc groove.

[0027] When the engine is running, the crankshaft rotates to transmit torque to the dual-mass flywheel's force transfer plate 1. The force transfer plate and the arc-shaped spring assembly form the traditional dual-mass flywheel's spring damping system. This system first performs basic vibration isolation and damping to reduce some torsional vibration amplitudes. The damped torque is then transmitted to the transmission through the clutch to achieve power transmission. When the engine is at low speed, the pendulum 6 in the centrifugal pendulum damper mechanism rolls within the annular track of the force transmission plate 1 via the roller 5. Due to the different motion trajectories of the two rollers 5, the swing trajectory and amplitude of the pendulum 6 change with the speed rather than periodically. This breaks the original vibration frequency of the traditional dual-mass flywheel and prevents the dual-mass flywheel from resonating with the engine's non-primary harmonic order excitation at low speed, thereby improving the low-speed vibration isolation effect. As the engine speed increases, the pendulum 6 swings outward due to centrifugal force. Its swing trajectory changes regularly with the increase in engine speed, driving the second mass 3 radially closer to the outer edge of the force transmission plate. The radial position of the second mass increases its moment of inertia, providing additional moment of inertia for the system and absorbing more torsional vibration energy, thereby increasing the upper limit of vibration reduction of the dual-mass flywheel in the high speed range. The force transmission plate 1 has arc-shaped grooves uniformly distributed along its circumference and annular tracks on both sides, whose curvature matches the motion trajectory of the roller 5. This guides the pendulum 6 to swing along a specific trajectory, ensuring that the movement of the centrifugal pendulum vibration absorber mechanism is synchronized with the engine speed. The elastic buffer block 4 embedded in the second mass block 3 is made of elastic materials such as rubber and polyurethane. During the swing of the centrifugal pendulum vibration absorber mechanism, it cushions the collision between the second mass block 3 and the arc-shaped grooves of the force transmission plate 1, reducing fatigue wear of the components. The pin 2 passes through the connecting hole between the pendulum and the second mass block and is detachably fixed by an interference fit or threaded connection to ensure the structural stability of the centrifugal pendulum vibration absorber mechanism during swinging. This vibration reduction component combines a centrifugal pendulum vibration absorber mechanism with a traditional dual-mass flywheel. At low speeds, the resonant frequency is broken by the non-periodic oscillation of the dual rollers. At high speeds, the centrifugal force drives the radial displacement of the second mass block to adjust the moment of inertia. Compared with the traditional dual-mass flywheel, it effectively eliminates the low-speed resonance range and expands the upper limit of high-speed vibration reduction, achieving vibration isolation and reduction in the full speed range and optimizing transmission performance.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A centrifugal pendulum dual-mass flywheel vibration reduction assembly, characterized in that: It comprises a force transmission disc (1) and four centrifugal pendulum vibration absorber mechanisms; the force transmission disc (1) is provided with four arc-shaped grooves evenly distributed along the circumference, and a centrifugal pendulum vibration absorber mechanism is provided in each arc-shaped groove. Each of the centrifugal pendulum vibration absorber mechanisms comprises a pin (2), a second mass block (3), an elastic buffer block (4), two rollers (5) and two pendulums (6); Annular tracks matching the swing trajectory of the pendulum (6) are provided on both sides of each arc-shaped groove. Two rollers (5) are respectively arranged in the annular tracks on both sides of the arc-shaped groove. Both ends of each roller (5) are rotatably connected to the corresponding pendulum (6). A second mass block (3) is provided between the two pendulums (6) and is detachably connected via a pin (2). The second mass block (3) is arranged in the corresponding arc-shaped groove. The elastic buffer block (4) is embedded in the second mass block (3).

2. The centrifugal pendulum dual-mass flywheel vibration damping assembly according to claim 1, characterized in that: The force transmission disc (1) is combined with the arc-shaped spring assembly to form a spring damping system of a traditional dual-mass flywheel, and the layout of the arc-shaped groove matches the centrifugal pendulum shock absorber mechanism, so that the two can cooperate to achieve vibration isolation and vibration reduction.

3. The centrifugal pendulum dual-mass flywheel vibration damping assembly according to claim 1, characterized in that: The elastic buffer block (4) is located on the contact surface between the second mass block (3) and the arc-shaped groove of the force transmission plate (1). The elastic buffer block (4) is made of elastic material and is used to buffer the collision between the centrifugal pendulum vibration absorber mechanism and the force transmission plate (1).

4. The centrifugal pendulum dual-mass flywheel vibration damping assembly according to claim 1, characterized in that: The two pendulums (6) and the second mass block (3) are both provided with connection holes for use with the pin (2); the pin (2) passes through the corresponding connection holes of the two pendulums (6) and the second mass block (3), and a detachable connection between the two pendulums (6) and the second mass block (3) is achieved by interference fit or threaded connection.

5. The centrifugal pendulum dual-mass flywheel vibration damping assembly according to claim 1, characterized in that: The second mass block (3) is radially close to the outer edge of the force transmission disc (1) to increase the moment of inertia.

6. The centrifugal pendulum dual-mass flywheel vibration damping assembly according to claim 1, characterized in that: The pendulum (6) swings in the annular track via rollers (5) on both sides. The swinging track is different due to the two rollers (5) being located in the annular track on both sides of the arc groove.

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