CN205207538U - Dual mass flywheel based on cam mechanism - Google Patents

Abstract

The utility model discloses a dual-mass flywheel based on a cam mechanism, which comprises a first-mass flywheel, a second-mass flywheel and a torsional vibration-damping mechanism, and the torsional vibration-damping mechanism is located in an installation cavity between the first-mass flywheel and the second-mass flywheel Inside. The torsional damping mechanism includes an elastic return element group and a cam rotor. The elastic return element group includes a spring sleeve, a straight spring, a roller, a return mechanism, a connector and a linear guide rail. One end of the straight spring extends into the spring sleeve One end and the other end are connected with the first mass flywheel, and the other end of the spring sleeve is provided with a roller, which can roll on the return mechanism, which is fixed on the outer wall of the cam rotor; two linear guide rails are arranged on both sides of the spring sleeve , so that the spring sleeve slides along the linear guide rail, the linear guide rail is fixed on the connecting piece, and the connecting piece is fixed on the first mass flywheel. The utility model solves the problems that the torsional vibration damping effect of the dual-mass flywheel becomes worse and the long arc spring is worn out when the engine is in the idle speed working condition or the high-speed running working condition.

Description

A dual-mass flywheel based on a cam mechanism

technical field

The utility model relates to the field of mechanical transmission, in particular to a double-mass flywheel based on a cam mechanism.

Background technique

In automotive transmission systems, dual-mass flywheels are often used for torsional vibration damping, for example, between the engine and gearbox.

In some mechanical transmission systems, a dual mass flywheel can also be used for torsional vibration damping.

The dual-mass flywheel is mainly composed of three parts: the first-mass flywheel arranged on the side of the power source such as the engine, the second-mass flywheel arranged on the side of the speed change device such as the automobile transmission, and between the first-mass flywheel and the second-mass flywheel The torsional vibration damper is generally configured in the form of a long arc spring that makes the dual-mass flywheel have a large rotation angle.

The long-arc spring dual-mass flywheel structure of German LUK company is a mature product of the dual-mass flywheel currently in use. The dual-mass flywheel compresses the arc spring when the first mass flywheel is rotated by a power source such as an engine, and the compressed arc spring drives the second-mass flywheel, thereby transferring the torque of the engine to the second-mass flywheel. The arrangement of this dual-mass flywheel can reduce the natural frequency of the vibration system of the power source such as the engine and the transmission, so as to avoid resonance during idling rotation and improve the vibration under normal working conditions. At present, many researchers are studying and improving dual-mass flywheels with similar structures, such as the doctoral dissertation of Zhao Guangming of Wuhan University of Technology in 2013.

However, when a power source such as an engine rotates at a high speed, the dual-mass flywheel rotates at a high speed, and the long arc-shaped elastic element in the dual-mass flywheel that transmits torque by being compressed is pressed against the guide groove of the first-mass flywheel due to centrifugal force . The higher the rotational speed of the dual-mass flywheel, the greater the centrifugal force that the long-arc spring is subjected to, the greater the compression force it is thrown against the guide groove and the greater the frictional resistance it receives. As a result, the long arc-shaped elastic element cannot be further compressed, thus losing the effect of torsional vibration damping, and the vibration and noise of the system are large. And the manufacture of long arc springs is also much more difficult than straight springs.

Chinese patent 201310608654.8 discloses a dual-mass flywheel, which improves the long arc spring structure of LUK. Two torsional shock absorbers are arranged in series between the two masses of the dual-mass flywheel. The torsional stiffness of the outer shock absorber is greater than that of the inner shock absorber. torsion. Due to the long arc springs, this dual mass flywheel still faces similar issues as the LUK long arc springs.

The journal "Research Review of Dual Mass Flywheels (DMF)" in Noise and Vibration Control describes the types of dual mass flywheels, where the radial dual mass flywheel refers to the structural form in which the springs are arranged radially or approximately radially. The spring chamber is used to install the spring between the first mass flywheel and the second mass flywheel. Although this solution solves the problem of friction between the long arc spring and other parts during high-speed rotation, its mechanism is relatively complicated.

Contents of the invention

The purpose of this utility model is to provide a dual-mass flywheel based on a cam mechanism, which solves the problem of the deterioration of the torsional vibration damping effect of the dual-mass flywheel and the wear and tear of the long arc-shaped spring when the engine is in idling or high-speed operating conditions .

The technical solution to realize the purpose of the utility model is: a dual-mass flywheel based on a cam mechanism, including a first mass flywheel and a second mass flywheel arranged in parallel, and the cavity between the first mass flywheel and the second mass flywheel is The installation cavity also includes a torsional vibration damping mechanism, and the torsional vibration damping mechanism is located in the installation cavity between the first mass flywheel and the second mass flywheel.

The torsional vibration damping mechanism includes an elastic return element group and a cam rotor. The cam rotor is fixed at the center of the second mass flywheel. Several elastic return element groups are evenly distributed around the cam rotor and connected with the cam rotor. Each elastic The return element group includes a spring sleeve, a straight spring, a roller, a return mechanism, two connectors and two linear guide rails, the straight spring is arranged radially, one end of the straight spring extends into one end of the spring sleeve, and the other end is connected to the second A quality flywheel is connected, the other end of the spring sleeve is provided with a roller, the roller rolls on the return mechanism, and the return mechanism is fixed on the outer wall of the cam rotor; two linear guide rails are arranged on both sides of the spring sleeve, so that the spring sleeve moves along a straight line The guide rail slides, the linear guide rails are respectively fixed on the connectors, and the connectors are fixed on the first mass flywheel.

Further, the cam rotor is a triangle, the three sides of the triangle are arc-shaped, and the center of the radius of curvature faces the center of the cam rotor.

Further, there are three sets of elastic return elements, the return mechanism is arc-shaped, the center of the radius of curvature of which is opposite to the center of the cam rotor, and the return mechanism is fixedly connected to the arc-shaped side of the cam rotor.

Further, the return mechanism is fixedly connected to the middle of the arc-shaped side of the cam rotor.

Further, it also includes three stop pins, and the stop pins are evenly distributed on the second mass flywheel. When the relative rotation angle between the first mass flywheel and the second mass flywheel is 50°-65°, the stop pins and the connecting piece touch.

Further, the connecting piece is a hollow member, and there is no baffle on the side facing the center of the cam rotor, and the height of the stop pin is lower than that of the connecting piece. When the relative rotation angle between the first mass flywheel and the second mass flywheel is 50°-65° °, the stop pin turns into the cavity of the connecting piece and touches the side wall of the connecting piece, limiting the relative rotation of the first mass flywheel and the second mass flywheel.

Further, it also includes a cam rotor center disc, a shaft support bearing, a bearing and a center gasket, the cam rotor center disc is arranged at the center of the cam rotor, a bearing is arranged between the cam rotor center disc and the cam rotor, and a shaft support bearing is arranged At the center of the cam rotor central disk, a central gasket is provided on the end surface of the cam rotor central disk close to the second mass flywheel, and the cam rotor central disk and the central gasket are fixed on the first mass flywheel.

Further, a cam washer is also included, and the cam washer is arranged between the cam rotor and the second mass flywheel.

Compared with the prior art, the utility model has the following remarkable advantages: (1) Due to the addition of the torsional vibration damping mechanism, better torsional vibration damping effects can be obtained when the power source such as the engine is in various working conditions.

(2) The use of straight springs is more convenient to manufacture and has a longer service life.

(3) The corner torque has a nonlinear relationship, that is, the nonlinear stiffness. When the torsion angle is small, the stiffness is low, and when the torsion angle is large, the stiffness is high, which is more in line with the needs of vehicle transmission vibration isolation.

(4) Avoid friction and wear caused by the deformation of long arc springs caused by centrifugal force under high-speed rotating conditions.

Description of drawings

Fig. 1 is an axonometric view of the dual-mass flywheel based on the cam mechanism of the present invention viewed from the engine end (the first mass flywheel is hidden in the figure).

Fig. 2 is an axonometric view of the dual-mass flywheel based on the cam mechanism of the present invention viewed from the transmission end (the second mass flywheel is hidden in the figure).

Fig. 3 is a cross-sectional view of the dual-mass flywheel based on the cam mechanism of the present invention.

Fig. 4 is a schematic diagram of the connecting parts of the dual-mass flywheel based on the cam mechanism of the present invention.

Fig. 5 is a partial schematic diagram of the elastic return element group of the dual-mass flywheel based on the cam mechanism of the present invention.

Fig. 6 is a schematic diagram of the cam rotor and the return mechanism of the dual-mass flywheel based on the cam mechanism of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

1-6, a dual-mass flywheel based on a cam mechanism includes a first mass flywheel 1 and a second mass flywheel 17 arranged in parallel, and the cavity between the first mass flywheel 1 and the second mass flywheel 17 is The installation cavity also includes a torsional vibration damping mechanism, which is located in the installation cavity between the first mass flywheel 1 and the second mass flywheel 17 .

The torsional damping mechanism includes elastic return element groups and a cam rotor 18, the cam rotor 18 is fixed at the center of the second mass flywheel 17, several elastic return element groups are evenly distributed around the cam rotor 18, and are connected with the cam rotor 18 Connection, the elastic return element group includes a spring sleeve 3, a straight spring 4, a roller 7, a return mechanism 5, two connectors 2 and two linear guide rails 6, the straight spring 4 is arranged radially, and one end of the straight spring 4 extends Insert one end of the spring sleeve 3, the other end is connected with the first mass flywheel 1, the other end of the spring sleeve 3 is provided with a roller 7, the roller 7 can roll on the return mechanism 5, and the return mechanism 5 is fixed on the cam rotor 18 Outer wall; two linear guide rails 6 are arranged on both sides of the spring sleeve 3, so that the spring sleeve 3 slides along the linear guide rails 6, the linear guide rails 6 are fixed on the connector 2, and the connector 2 is fixed on the first mass flywheel 1.

Further, the cam rotor 18 is a triangle, the three sides of the triangle are arc-shaped, and the center of the radius of curvature faces the center of the cam rotor 18 .

Further, there are three sets of elastic return elements, the return mechanism 5 is arc-shaped, and its center of curvature radius is opposite to the center of the cam rotor 18 , and the return mechanism 5 is fixedly connected to the arc-shaped side of the cam rotor 18 .

Further, the return mechanism 5 is fixedly connected to the middle of the arc-shaped side of the cam rotor 18 .

Further, it also includes three stop pins 16, the stop pins 16 are evenly distributed on the second mass flywheel 17, when the relative rotation angle between the first mass flywheel 1 and the second mass flywheel 17 is 50°-65°, the stop pins 16 The bit pin 16 is in contact with the connecting piece 2 .

Further, the connecting piece 2 is a hollow member facing the side of the center of the cam rotor 18 without a baffle, the height of the stop pin 16 is lower than that of the connecting piece 2, when the first mass flywheel 1 and the second mass flywheel 17 When the relative rotation angle is 50°-65°, the stop pin 16 turns into the cavity of the connector 2 and touches the side wall of the connector 2 to limit the relative rotation of the first mass flywheel 1 and the second mass flywheel 17 .

Further, it also includes a cam rotor center disc 22, a shaft support bearing 11, a bearing 20 and a center spacer 10, the cam rotor center disc 22 is arranged at the center of the cam rotor 18, and a cam rotor center disc 22 and the cam rotor 18 are provided There are bearings 20, and a shaft support bearing 11 is arranged at the center of the cam rotor center disc 22, and the end face of the cam rotor center disc 22 close to the second mass flywheel 17 is provided with a center gasket 10, and the cam rotor center disc 22 and the center gasket 10 are fixed on On the first mass flywheel 1.

Further, a cam washer 8 is also included, and the cam washer 8 is arranged between the cam rotor 18 and the second mass flywheel 17 .

Example 1

Taking it installed between the engine and transmission of a car as an example, it can reduce the natural frequency of the torsional vibration of the engine and transmission system and avoid resonance at idle speed, and realize the function of vibration reduction in the driving condition of the car.

1-6, a dual-mass flywheel based on a cam mechanism includes a first mass flywheel 1 and a second mass flywheel 17 arranged in parallel, and the cavity between the first mass flywheel 1 and the second mass flywheel 17 is The installation cavity also includes a torsional vibration damping mechanism, which is located in the installation cavity between the first mass flywheel 1 and the second mass flywheel 17 . The first mass flywheel 1 is connected with the output shaft of the power source automobile engine, that is, the active flywheel, and the second mass flywheel 17 is connected with the automobile clutch, that is, the driven flywheel 17 .

The torsional vibration damping mechanism includes elastic return element groups and a cam rotor 18, the cam rotor 18 is fixed on the center of the second mass flywheel 17 by rivets, three elastic return element groups are evenly distributed around the cam rotor 18, and are connected with the cam The rotor 18 is connected, and the elastic return element group includes a spring sleeve 3, a straight spring 4, a roller 7, a return mechanism 5, two connecting pieces 2 and two linear guide rails 6, the straight spring 4 is arranged radially, and the straight spring 4 One end extends into one end of the spring sleeve 3 , and the other end is fixedly connected with the first mass flywheel 1 through the guide column 23 . The other end of spring sleeve 3 is connected with roller 7 by bearing pin 28, and one end of bearing pin 28 adopts cotter pin 27 to lock, avoids bearing pin to come off. The roller 7 can roll on the return mechanism 5, and the return mechanism 5 is fixed on the outer wall of the cam rotor 18 by rivets. Two linear guide rails 6 are arranged on both sides of the spring sleeve 3, and the spring sleeve 3 is fixedly connected with the slide block of the linear guide rail 6 through the shaft pin 26, so that the spring sleeve 3 slides along the linear guide rail 6, and the straight spring 4 is constrained only along the deformation in the radial direction. The linear guide rail 6 is fixed on the connecting piece 2 through rivets, and the connecting piece 2 is fixed on the first mass flywheel 1 through rivets.

The cam rotor 18 is a triangle, and the three sides of the triangle are arc-shaped, and the center of the radius of curvature faces the center of the cam rotor 18 .

The above-mentioned elastic return element groups are three groups, and the return mechanism 5 is arc-shaped, and its center of curvature radius is opposite to the center of the cam rotor 18, and the return mechanism 5 is fixed in the middle of the arc-shaped side of the cam rotor 18. The roller 7 indirectly acts on the cam rotor 18 through the return mechanism 5, and changes its radial position by rolling on the cam rotor 18, thereby also determining the compression stroke of the straight spring 4.

Also include three stop pins 16, the stop pins 16 are evenly distributed on the second mass flywheel 17, when the relative rotation angle of the first mass flywheel 1 and the second mass flywheel 17 is 50°-65°, the stop pins 16 Contact with connector 2. The connecting piece 2 is a hollow member, and there is no baffle on the side facing the center of the cam rotor 18. The height of the stop pin 16 is lower than that of the connecting piece 2. When the relative rotation angle between the first mass flywheel 1 and the second mass flywheel 17 is 50° When °-65°, the stop pin 16 turns into the cavity of the connecting piece 2, touches the side wall of the connecting piece 2, and limits the relative rotation of the first mass flywheel 1 and the second mass flywheel 17.

It also includes a cam rotor center disk 22, a shaft support bearing 11, a bearing 20 and a center spacer 10, the cam rotor center disk 22 is arranged at the center of the cam rotor 18, and the cam rotor center disk 22 is provided with several crankshaft bolt holes for In connection with the crankshaft, a bearing 20 is provided between the cam rotor center disk 22 and the cam rotor 18, a shaft support bearing 11 is arranged at the center of the cam rotor center disk 22, and a cam rotor center disk 22 and the second mass flywheel 17 are provided with The center spacer 10 constrains the axial position of the bearing 20 , and fixes the cam rotor center disc 22 and the center spacer 10 on the first mass flywheel 1 through rivets.

It also includes a cam washer 8 which is arranged between the cam rotor 18 and the second mass flywheel 17 to constrain the axial position of the bearing 20 .

Claims (8)

1. A dual-mass flywheel based on a cam mechanism, characterized in that: it includes a first mass flywheel (1) and a second mass flywheel (17) arranged in parallel, and the first mass flywheel (1) and the second mass flywheel (17 ) is an installation cavity, which also includes a torsional vibration damping mechanism, and the torsional vibration damping mechanism is located in the installation cavity between the first mass flywheel (1) and the second mass flywheel (17); The torsional vibration damping mechanism includes an elastic return element group and a cam rotor (18), the cam rotor (18) is fixed at the center of the second mass flywheel (17), and several elastic return element groups are evenly distributed on the cam rotor (18 ) and connected with the cam rotor (18), each elastic return element group includes a spring sleeve (3), a straight spring (4), a roller (7), a return mechanism (5), two connecting pieces ( 2) and two linear guide rails (6), the straight spring (4) is arranged radially, one end of the straight spring (4) extends into one end of the spring sleeve (3), and the other end is connected with the first mass flywheel (1), The other end of the spring sleeve (3) is provided with a roller (7), which rolls on the return mechanism (5), and the return mechanism (5) is fixed on the outer wall of the cam rotor (18); two linear guide rails ( 6) Set on both sides of the spring sleeve (3), so that the spring sleeve (3) slides along the linear guide rail (6), the linear guide rail (6) is respectively fixed on the connecting piece (2), and the connecting piece (2) is fixed on the on the first mass flywheel (1). 2. The dual-mass flywheel based on the cam mechanism according to claim 1, characterized in that: the cam rotor (18) is a triangle, the three sides of the triangle are arc-shaped, and the center of the radius of curvature faces the cam rotor (18) center. 3. The dual-mass flywheel based on the cam mechanism according to claim 2, characterized in that: there are three groups of elastic return elements, the return mechanism (5) is arc-shaped, and its center of curvature radius is in line with the cam rotor (18 ) center is reversed, and the return mechanism (5) is fixedly connected with the arc-shaped side of the cam rotor (18). 4. The cam mechanism-based dual mass flywheel according to claim 3, characterized in that: the return mechanism (5) is fixedly connected to the middle of the arc-shaped side of the cam rotor (18). 5. The dual-mass flywheel based on a cam mechanism according to claim 2, characterized in that it further comprises three stop pins (16), and the stop pins (16) are evenly distributed on the second mass flywheel (17), When the relative rotation angle between the first mass flywheel (1) and the second mass flywheel (17) is 50°-65°, the stop pin (16) is in contact with the connecting piece (2). 6. The dual-mass flywheel based on a cam mechanism according to claim 5, characterized in that: the connecting piece (2) is a hollow member, there is no baffle on the side facing the center of the cam rotor (18), and the stop pin (16 ) is lower than the height of the connecting piece (2), when the relative rotation angle between the first mass flywheel (1) and the second mass flywheel (17) is 50°-65°, the stop pin (16) turns into the connecting piece ( The cavity in 2) meets the side wall of the connecting piece (2), limiting the relative rotation of the first mass flywheel (1) and the second mass flywheel (17). 7. The dual mass flywheel based on cam mechanism according to claim 1, characterized in that it further comprises a cam rotor center disc (22), a shaft support bearing (11), a bearing (20) and a center spacer (10) , the cam rotor center plate (22) is set at the center of the cam rotor (18), the cam rotor center plate (22) and the cam rotor (18) are provided with a bearing (20), and a shaft support bearing (11) is set on the cam At the center of the rotor center disc (22), the end face of the cam rotor center disc (22) close to the second mass flywheel (17) is provided with a center gasket (10), and the cam rotor center disc (22) and the center gasket (10) are fixed on on the first mass flywheel (1). 8. The dual-mass flywheel based on a cam mechanism according to claim 1, characterized in that it further comprises a cam washer (8), and the cam washer (8) is arranged between the cam rotor (18) and the second mass flywheel (17) )between.