CN213270878U - Dual mass flywheel with built-in centrifugal pendulum unit - Google Patents

Abstract

There is provided a dual mass flywheel having a built-in centrifugal pendulum unit, comprising: a primary mass for driving coupling with an output shaft of the engine; a flange for driving coupling to an input shaft of a transmission; at least two arcuate springs disposed in a spring receiving space defined by the primary mass and capable of compressing the flange; centrifugal force units mounted to the flange at intervals in a circumferential direction of the dual mass flywheel; and the sealing part, the primary mass and the flange jointly enclose a closed space, and the centrifugal force unit is positioned in the closed space. The utility model discloses a dual mass flywheel can reduce dual mass flywheel's axial dimensions, and centrifugal force unit does not receive external environment pollution simultaneously to reduce the noise of outside propagation, improve the reliability of NVH performance and part.

Description

Dual mass flywheel with built-in centrifugal pendulum unit

Technical Field

The present invention relates to a damper, and more particularly to a dual mass flywheel having a centrifugal force pendulum unit, and more particularly to a dual mass flywheel having a built-in centrifugal force pendulum unit.

Background

Centrifugal pendulums are known in the art for damping and/or dampening torsional vibrations introduced by the drive shaft of a motor vehicle engine. The centrifugal force pendulum has: a fixed disk that can be fitted in the torque flow of a drive train, in particular an input flange or an output flange of a dual mass flywheel; a pendulum mass displaceable relative to the stationary disk as a result of centrifugal force; and at least one roller guided in the disk rolling track of the fixed disk and in the pendulum rolling track of the pendulum mass for guiding the pendulum mass relative to the fixed disk between the intermediate position and the extreme deflection position. By means of the centrifugal pendulum movement of the pendulum masses in relation to the stationary disk in the rolling track, vibrations in the drive train can be damped.

However, the centrifugal pendulum masses of the prior art are mounted on the secondary mass of a dual-mass flywheel, which can be mounted radially further outward, with a larger radius, and which have a greater centrifugal force at the same rotational speed, which in turn has a better damping effect. However, such an arrangement also entails problems, since the centrifugal pendulum mass mounted on the secondary mass can be subjected to greater centrifugal forces and impacts during operation, and can cause greater noise when the centrifugal pendulum mass is stopped at the extreme deflection position; at the same time, the centrifugal pendulum mass also generates noise during movement due to friction or impacts and impacts between its individual components. The centrifugal pendulum mass is located in an open space, which results in poor NVH conditions.

At the same time, since the centrifugal pendulum mass is mounted on the secondary mass, it takes up a certain axial space, so that the axial space taken up by such an arrangement is relatively large. In some situations where the available axial space is small, such an arrangement is often not able to meet the space requirements, making it unusable.

There is a continuing effort in the art to ameliorate or even eliminate the above problems.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above-described state of the art. An object of the utility model is to provide a compact structure and reliable, the low dual mass flywheel of noise.

Provided is a dual mass flywheel having a built-in centrifugal pendulum unit, including:

a primary mass for driving coupling with an output shaft of the engine;

a flange connected to the transmission input shaft;

at least two arcuate springs disposed in a spring receiving space defined by the primary mass, the at least two arcuate springs and the radially projecting portion of the flange being spaced apart in a circumferential direction of the dual mass flywheel such that the arcuate springs can press the radially projecting portion of the flange to transmit torque to the flange, whereby torque can be transmitted between the primary mass, the arcuate springs and the flange;

a closure member comprising a first closure member disposed between one side of the flange and the primary mass and a second closure member disposed between the other side opposite the one side and the primary mass, the first closure member, the flange and the second closure member forming an annular enclosure in which at least a portion of the flange is located,

at least two centrifugal force units, at least a portion of the flange carrying the centrifugal force units, the centrifugal force units being located in the enclosed space;

the centrifugal force unit comprises a centrifugal mass and a roller, wherein a raceway is arranged on the centrifugal mass, a corresponding raceway is arranged on a bearing part connected with the flange, and the centrifugal mass realizes the movement of the centrifugal mass relative to the flange through the movement of the roller in the raceway on the centrifugal mass and the corresponding raceway on the bearing part.

Further, the first closing member and the second closing member are ring-shaped, one end of the first closing member and the second closing member is fixedly connected to one of the primary mass and the flange, respectively, and the other end abuts against the other of the primary mass and the flange. Preferably, the first and second closure members are resilient.

Further, the one ends of the first closing member and the second closing member are fixedly connected to one of the primary mass and the flange by caulking.

Further, a shoulder is provided on the primary mass or flange, which abuts against the other ends of the first and second closing members to close the closed space.

Further, lubricating oil or grease is provided in the closed space, and the centrifugal force unit is surrounded by the lubricating oil or grease.

Further, the flange includes at least two flange ears projecting radially outward from the flange body, constituting radially projecting portions of the flange. And the arc-shaped spring is arranged between two adjacent flange lugs.

Further, the centrifugal force units are evenly distributed in the circumferential direction.

Further, each centrifugal force unit comprises two centrifugal masses, which are fixed relative to each other and are located on both axial sides of the flange.

Further, the primary mass includes a first housing and a second housing that are connected together at a radially outer side portion of the dual mass flywheel and form a spring accommodation space that accommodates the at least two arc-shaped springs.

Further, the centrifugal force unit is disposed radially inward of the at least two arc springs.

Because the closed space is arranged and the centrifugal force unit is arranged in the closed space, preferably, lubricating oil or lubricating grease is also arranged in the closed space, the axial size of the dual-mass flywheel can be reduced, the noise generated by the centrifugal force unit is reduced, the noise is isolated in the closed space, the noise influence on the outside is reduced, and the NVH performance of the dual-mass flywheel is improved. Meanwhile, the centrifugal unit is sealed in the closed space, and compared with the existing closed environment, the centrifugal unit is positioned in the external open environment, the adverse effect of external environments such as dust, silt, ice water and the like on the performance and the service life of the centrifugal unit can be eliminated, and the reliability and the stability of the centrifugal unit are improved.

Drawings

Fig. 1 shows a dual mass flywheel according to the invention.

Fig. 2 shows a cross-sectional view of a dual mass flywheel according to the present invention.

Description of the reference numerals

1 primary mass; 2, flange; 3, an arc-shaped spring; 4 a first closure member; 5 a second closure member; 6 a centrifugal force unit; 7 flange ear parts; 8 a first housing; 9 a second housing; 10 enclosing a space.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.

The vibration isolation (i.e., vibration damping) effect of the dual mass flywheel having the centrifugal force unit is significantly superior to that of the dual mass flywheel having no centrifugal force unit, however, the existing centrifugal force unit is mounted on the secondary mass, axially offset from the flange and located radially outside the arc spring, thereby causing an excessive axial size of the dual mass flywheel and a loud noise.

Referring to fig. 1 to 2, one embodiment of the present invention provides a dual mass flywheel having a centrifugal force unit 6 (centrifugal force pendulum vibration absorber).

The dual mass flywheel comprises: the primary mass 1 (which may also be referred to as "first flywheel mass" or "main flywheel mass") is intended to be drivingly coupled to an output shaft of the engine for transferring torque generated by the engine in the direction of the gearbox or from the direction of the gearbox to the engine.

A flange 2 connected to the gearbox input shaft. The flange 2 is of a substantially annular configuration and the primary mass 1 is also of a substantially annular configuration, the flange 2 and the primary mass 1 being able to be arranged substantially concentrically and being able to rotate relative to one another about an axial direction of rotation. The flange 2 also has two flange ears 7, the two flange ears 7 being arranged opposite each other at 180 degrees. The flange ears 7 project radially outwardly from the annular body of the flange 2.

Two arc springs 3 disposed in a spring receiving space defined by the primary mass 1, the two arc springs 3 and flange ears 7 of the flange 2 being arranged at intervals in a circumferential direction of the dual mass flywheel, so that the arc springs 3 can press the flange ears 7 of the flange 2 to transmit torque to the flange 3, whereby torque can be transmitted among the primary mass 1, the arc springs 3, and the flange 2. The arc spring 3 can damp the torque transmitted by the arc spring 3, and reduce or eliminate the torsional vibration component in the torque so as to reduce or eliminate the adverse effect of the torsional vibration in the torque on the driving system.

Be provided with the backstop portion (not shown in the figure) that offsets in order to promote arc spring 3 with the tip of arc spring 3 on elementary quality 1, when elementary quality 1 is to the transmission side transmission moment of torsion, backstop portion on the elementary quality 1 promotes arc spring 3's tip compression arc spring 3, and the other end of arc spring 3 then presses flange ear 7 of propping flange 2, promotes flange 2 and rotates, accomplishes the moment of torsion from the engine through elementary quality 1, arc spring 3, flange 2's transmission in proper order with this mode. Similarly, torque can be transmitted from the transmission side to the engine side via the flange 2, the arcuate spring 3, and the primary mass 1 in this order.

And a closure member comprising a first closure member 4 and a second closure member 5, the first closure member 4 being disposed between one side of the flange 2 (the left side of the flange 2 in fig. 2) and the primary mass 1, the second closure member 5 being disposed between the other side opposite to the one side (the right side of the flange 2 in fig. 2) and the primary mass 1, the first closure member 4, the flange 2 and the second closure member 5 constituting an annular closed space 10, at least a portion of the flange 2 being located in the closed space 10, i.e. the portion of the flange 2 located radially outside the first closure member 4 in fig. 2.

In order to enable a better damping of the torque transmitted by the dual mass flywheel, the dual mass flywheel further comprises four centrifugal force units 6, said centrifugal force units 6 being carried by said at least one portion of the flange 2 located in the enclosed space 10, i.e. said centrifugal force units 6 are located in said enclosed space 10. The centrifugal force units 6 are arranged uniformly in the circumferential direction on the flange 2, so that the rotational balance of the flange 2 and the centrifugal force units 6 as a whole is maintained. Of course, other arrangements that ensure rotational balance may be used.

The centrifugal force unit 6 comprises a centrifugal mass on which the raceways are provided and a corresponding raceway on the flange 2, and a roller, the centrifugal mass realizing a movement of the centrifugal mass relative to the flange 2 by a movement of the roller in the raceway on the centrifugal mass and in the corresponding raceway on the flange 2. Each centrifugal force unit 6 comprises two centrifugal masses which are fixed relative to each other and which are located on either axial side of the flange 2.

Further, the first closing member 4 and the second closing member 5 are ring-shaped. One end of the first closing member 4 is fixed to the primary mass 1 by caulking, and the other end of the first closing member 4 abuts against the flange 2, thereby closing a gap between the left side of the flange 2 and the primary mass 1 in the radial inner direction. Preferably, the first closing part 4 is elastic, and an annular disc spring may be selected, so that the first closing part 4 can be deformed in the axial direction when receiving the axial force of the flange 2, thereby accommodating the axial relative floating between the primary mass 1 and the flange 2 during the operation of the dual-mass flywheel, and reliably ensuring the reliable closing of the gap between the left side of the flange 2 and the primary mass 1. In order to ensure a reliable contact of the first closing element 4 with the flange 2, a shoulder is provided on the flange 2 which abuts against the other end of the first closing element 4, as shown in fig. 2. The shoulder comprises a radially outer extension in the axial direction, and the first closing element 4 is arranged between the primary mass 4 and the shoulder of the flange 2 in a manner that allows precompression, ensuring a reliable closing action of the first closing element 4.

Alternatively, of course, the first closing element 4 can also be arranged with one end riveted to the flange 2 and the other end abutting against the primary mass 1.

A second closing member 5 is located on the right side of the flange 2 to seal the gap between the right side of the flange 2 and the primary mass 1. As shown in fig. 2, the second closing member 5 has an inner end riveted to the flange 2 and an outer end abutting against the primary mass 1. The second closing element 5 is preferably an elastic annular disc spring which is arranged between the right side of the flange 2 and the primary mass 1 in a precompressed manner, in order to accommodate the axial relative floating movement of the dual mass flywheel which occurs between the primary mass 1 and the flange 2 during operation, so that a reliable closing of the gap between the right side of the flange 2 and the primary mass 1 is reliably ensured. In order to ensure a reliable contact of the second closing element 5 with the primary mass 1, a shoulder is provided on the primary mass 1 which abuts against the outer end of the second closing element 5, as shown in fig. 2. The shoulder comprises a radially outer extension in the axial direction, and the second closing element 5 is arranged between the primary mass 4 and the shoulder of the flange 2 in a manner that allows precompression, ensuring a reliable closing action of the second closing element 5.

Alternatively, the second closing element 5 can also be provided with one end riveted to the primary mass 1 and the other end resting against the flange 2.

Further, a lubricating oil or grease is provided in the closed space 10, and the centrifugal force unit 6 is surrounded by the lubricating oil or grease. First, the centrifugal mass of the centrifugal unit 6, the rollers and the flange 2 move relatively to each other and generate mechanical friction, and the centrifugal unit 6 is wrapped in lubricating oil or lubricating grease, so that the lubricating oil or lubricating grease can be applied to the contact portion between the mechanical parts, and the friction can be reduced, the energy loss can be reduced, and the efficiency can be improved. Secondly, the centrifugal force unit 6 moves in the lubricant oil or the lubricant grease, and the lubricant oil or the lubricant grease damps the centrifugal force unit 6 in motion, so that impact collision of the centrifugal force unit 6 can be weakened. Furthermore, when collision noise is generated, the lubricating oil or grease can absorb the noise well, preventing the noise from spreading outside the closed space 10, whereby the noise generated by the centrifugal force unit 6 is greatly reduced under multiple insulation of the first closing part 4, the second closing unit 5, and the lubricating oil or grease located in the closed space 10, and is not transmitted outside the closed space 10.

Further, as shown in fig. 2, the primary mass 1 includes a first case 8 and a second case 9, and the first case 8 and the second case 9 are connected together at a radially outer side portion of the dual mass flywheel and form a spring accommodation space that accommodates the two arc springs 3.

Further, the centrifugal force unit 6 is disposed radially inside the two arc springs 3.

Since the closed space 10 is provided and the centrifugal force unit 6 is provided in the closed space 10, preferably, lubricating oil or lubricating grease is further provided in the closed space 10, thereby enabling to reduce the axial size of the dual mass flywheel, reduce the noise generated by the centrifugal force unit 6, and insulate the noise in the closed space 10, reduce the influence of the noise on the outside, and improve the NVH performance of the dual mass flywheel. Meanwhile, the centrifugal force unit 6 is enclosed in the enclosed space 10, and compared with the existing environment which is open outside, the adverse effects of factors such as dust, silt, ice water and the like on the performance and the service life of the centrifugal force unit 6 can be eliminated, and the reliability and the stability of the centrifugal force unit 6 are improved.

Further explanation is as follows:

i. although in the embodiment 4 centrifugal force units 6 are selected for the dual mass flywheel, other numbers of centrifugal force units 6 may be selected, such as 2, 3, 5, 6, etc. Meanwhile, the number of the arc springs 3 can also be selected from other numbers, such as 3, 4, etc., and it should be noted that the number of the arc springs 3 is consistent with the number of the flange ears 7 of the flange 2.

Although in the specific embodiment the centrifugal force unit 6 is carried directly on the flange 2, alternatively, in the closed space 10 the flange 2 may be provided with a carrier part axially offset with respect to the flange 2, on which carrier part the centrifugal force unit 6 is carried, i.e. the centrifugal force unit 6 is arranged axially offset with respect to the flange 2. The centrifugal force unit 6 may also comprise only one centrifugal mass.

It should be understood that the above embodiments are exemplary only, and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof.

Claims (11)

1. A dual mass flywheel having a built-in centrifugal pendulum unit, comprising:

a primary mass for driving coupling with an output shaft of the engine;

a flange connected to the transmission input shaft;

at least two arcuate springs disposed in a spring receiving space defined by the primary mass, the at least two arcuate springs and the radially projecting portion of the flange being spaced apart in a circumferential direction of the dual mass flywheel such that the arcuate springs can press the radially projecting portion of the flange to transmit torque to the flange, whereby torque can be transmitted between the primary mass, the arcuate springs and the flange; it is characterized in that the preparation method is characterized in that,

a closure member comprising a first closure member disposed between one side of the flange and the primary mass and a second closure member disposed between the other side opposite the one side and the primary mass, the first closure member, the flange and the second closure member forming an annular enclosure in which at least a portion of the flange is located,

at least two centrifugal force units, at least a portion of the flange carrying the centrifugal force units, the centrifugal force units being located in the enclosed space;

the centrifugal force unit comprises a centrifugal mass and a roller, wherein a raceway is arranged on the centrifugal mass, a corresponding raceway is arranged on a bearing part connected with the flange, and the centrifugal mass realizes the movement of the centrifugal mass relative to the flange through the movement of the roller in the raceway on the centrifugal mass and the corresponding raceway on the bearing part.

2. A twin mass flywheel as defined in claim 1 in which the first and second closure members are annular, one end of the first and second closure members being fixedly connected to one of the primary mass and the flange respectively, and the other end abutting the other of the primary mass and the flange.

3. A twin mass flywheel as defined in claim 2 in which the said one ends of the first and second closure members are fixedly connected to one of the primary mass and the flange by riveting.

4. A twin mass flywheel as defined in claim 3 in which a shoulder is provided on the primary mass or flange which abuts the other ends of the first and second closure members to close the enclosure.

5. A twin mass flywheel as defined in claim 1 in which lubricating oil or grease is provided in the enclosed space, the centrifugal force unit being surrounded by lubricating oil or grease.

6. A dual mass flywheel as claimed in claim 1 in which the flange comprises at least two flange ears projecting radially outwardly from the flange body, constituting radially projecting portions of the flange; and the arc-shaped spring is arranged between two adjacent flange lugs.

7. A twin mass flywheel as defined in claim 1 in which the centrifugal force units are evenly distributed in the circumferential direction.

8. A twin mass flywheel as defined in claim 7 in which each centrifugal unit comprises two centrifugal masses which are relatively fixed and located on either axial side of the flange.

9. A dual mass flywheel as claimed in claim 1 in which the primary mass comprises a first housing and a second housing connected together at a radially outer portion of the dual mass flywheel and forming a spring receiving space in which the at least two arcuate springs are received.

10. A twin mass flywheel as defined in claim 1 in which the centrifugal force unit is disposed radially inwardly of the at least two arcuate springs.

11. A twin mass flywheel as defined in claim 2 in which the first and second closure members are resilient.

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