Planetary gear centrifugal pendulum shock absorber

Abstract

The present invention discloses a planetary gear type centrifugal pendulum vibration damper, wherein at least one pendulum subassembly is mounted on a shaft sleeve plate, the shaft sleeve plate is equipped with planetary gears of the same number as the pendulum subassembly, the planetary gears are equipped with volute springs, the outer gears of the planetary gears are meshed with the middle plate gears of the pendulum subassembly, and the movement of the planetary gears controls the movement trajectory of the pendulum subassembly. The present invention has the advantage of utilizing a planetary gear structure to limit the working trajectory of a centrifugal pendulum, so that the pendulum can only work on a trajectory that produces a vibration reduction effect, thereby preventing the generation of abnormal knocking noises.

Description

Technical Field

[0001] The invention relates to a torsional vibration damper of an automobile power assembly system, in particular to a planetary gear type centrifugal pendulum vibration damper. Background Art

[0002] Centrifugal pendulum shock absorbers are mainly used in the powertrain system of automobiles. They are usually installed between the engine and the gearbox to provide vibration and noise reduction functions for the automobile.

[0003] Due to its own structural characteristics, the current centrifugal pendulum shock absorber requires the pendulum to swing freely in the process of achieving the vibration reduction effect. If it is well matched, it generally has good vibration reduction performance under high engine speed. However, due to the flexible swing of the pendulum, in the working range with low speed such as engine starting, due to factors such as relatively low centrifugal force and large engine vibration, the pendulum cannot guarantee the ideal motion trajectory, and will produce knocking noises and poor vibration reduction effects due to irregular motion. With the continuous improvement of the requirements for vehicle comfort, it is necessary to provide a more stable and reliable centrifugal pendulum shock absorber to meet the demand.

[0004] A Chinese patent (CN102141113B) discloses a centrifugal pendulum vibration damper, in which a first plate is movably connected to a plurality of pendulums to realize the function of a centrifugal pendulum. Since there is no good structural constraint and positioning between the pendulums and the first plate, under low-speed working conditions such as engine starting, flameout, and downhill, the centrifugal pendulum has low centrifugal force and high-speed fluctuations, and the pendulums do not move according to the ideal working trajectory, resulting in poor vibration reduction effect, abnormal noise, and other problems.

[0005] This is exactly where this application needs to focus on improvement. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a planetary gear type centrifugal pendulum vibration absorber to improve the working stability and vibration reduction performance of the centrifugal pendulum.

[0007] In order to solve the above technical problems, the present invention provides a planetary gear type centrifugal pendulum vibration absorber, wherein at least one pendulum subassembly is mounted on the shaft sleeve plate, the shaft sleeve plate is equipped with planetary gears of the same number as the pendulum subassembly, the planetary gears are equipped with volute springs, the outer gears of the planetary gears are meshed with the middle plate gears of the pendulum subassembly, and the movement of the planetary gears controls the movement trajectory of the pendulum subassembly, so that the pendulum can only work on the trajectory that produces the vibration reduction effect, and prevent the generation of abnormal knocking noise.

[0008] The volute spring is provided with an inner flange, an outer flange and a volute spring limiting surface. The outer flange passes through the volute spring mounting hole of the planetary gear, the inner flange is embedded in the volute spring fixing shaft of the planetary gear, the volute spring is installed in the volute spring mounting groove of the planetary gear, the outer flange moves in the swing angle space of the planetary gear, and when the pendulum sub-assembly moves to the extreme position, the volute spring limiting surface contacts the planetary gear limiting surface to control the movement trajectory of the pendulum sub-assembly.

[0009] The planetary gear is also provided with a sliding step and a sliding surface. The sliding step clamps the upper end surface and the lower end surface of the shaft sleeve plate to axially position the planetary gear. The sliding surface contacts the inner hole surface of the semicircular hole of the shaft sleeve plate to generate damping during the operation of the centrifugal pendulum and ensure the normal operation of the planetary gear; the intermediate plate gear of the pendulum sub-assembly drives the planetary gear to move, and the planetary gear drives the scroll spring to generate additional stiffness and damping during the back and forth rotation.

[0010] The pendulum subassembly includes at least one intermediate plate and at least one pendulum weight. The intermediate plate is provided with a mass block and an intermediate plate gear. The mass block adjusts the overall mass of the pendulum subassembly according to demand.

[0011] The pendulum subassembly is assembled with the shaft sleeve plate through at least one roller, and the roller passes through the fixing holes on the shaft sleeve plate and the pendulum weight block respectively.

[0012] The shaft sleeve plate is provided with a shaft sleeve plate semicircular hole and a groove, and the outer flange of the spiral spring is embedded in the groove and fixed.

[0013] The superior effects of the structure of the present invention are:

[0014] 1) This application uses a planetary gear structure to limit the working trajectory of the centrifugal pendulum, so that the pendulum can only work on the trajectory that produces a vibration reduction effect, thereby preventing the generation of abnormal knocking noise;

[0015] 2) This application uses a volute spring to provide additional stiffness and damping for the centrifugal pendulum, which provides greater room for optimization during vehicle matching;

[0016] 3) The present application is applied to the structure of power-transmitting components such as dual-mass flywheels, clutches, and torque converters, thereby reducing vibration and noise of the powertrain and increasing the service life of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a schematic cross-sectional view of an assembly of an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the assembly cross section in the AA direction;

[0020] Figure 3 It is a partial schematic diagram of the pendulum sub-assembly according to an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of the middle plate of the pendulum sub-assembly according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of a planetary gear according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a volute spring according to an embodiment of the present invention;

[0024] 1-shaft sleeve plate;

[0025] 101 - semicircular hole of the shaft sleeve; 102 - groove;

[0026] 2-Roller; 3-Swinging weight;

[0027] 4 – middle plate;

[0028] 401 - rivet hole; 402 - mass block;

[0029] 403 - intermediate plate gear;

[0030] 5 – rivet pin;

[0031] 6 – planetary gear;

[0032] 601-external gear; 602-volute spring fixed shaft;

[0033] 603-sliding step; 604-planetary gear limit surface;

[0034] 605-Scroll spring mounting groove; 606-Sliding surface;

[0035] 607 - Swing angle space; 608 - Scroll spring mounting hole;

[0036] 7-volute spring;

[0037] 701-inner turn-up; 702-outer turn-up;

[0038] 703-Scroll spring limit surface. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Figure 1 It is a schematic cross-sectional view of the assembly of the present invention, Figure 2 for Figure 1 Schematic diagram of the assembly cross section in the AA direction, Figure 3 It is a partial schematic diagram of the assembly of the present invention. Figure 4 It is a schematic diagram of the intermediate plate parts of the present invention, Figure 5 This is a schematic diagram of the planetary gear parts of the present invention. Figure 6 It is a schematic diagram of the scroll spring parts of the present invention.

[0041] like Figure 1 and Figure 2 As shown, the planetary gear type centrifugal pendulum vibration absorber includes a shaft sleeve plate 1, a roller 2, a pendulum weight 3, an intermediate plate 4, a rivet pin 5, a planetary gear 6, and a scroll spring 7. In this embodiment, two intermediate plates 4, two pendulum weights 3 and four rivet pins 5 are riveted through rivet holes 401 to form a pendulum sub-assembly as an example, and a centrifugal pendulum vibration absorber composed of four pendulum sub-assemblies is taken as an example. In actual applications, the number of pendulum sub-assemblies used and the components included in the pendulum sub-assembly can be arbitrarily adjusted according to specific circumstances.

[0042] like Figure 3 As shown, the pendulum subassembly is assembled with the shaft sleeve plate 1 through two rollers 2, and the rollers 2 pass through waist-shaped holes arranged on the shaft sleeve plate 1 and the pendulum weight 3 respectively.

[0043] The spiral spring 7 is installed in the planetary gear 6. Figure 6 As shown, the spiral spring 7 is provided with an inner flange 701, an outer flange 702 and a spiral spring limiting surface 703. Figure 5 As shown, the planetary gear 6 is provided with an external gear 601, a scroll spring fixing shaft 602, a sliding step 603, a planetary gear limiting surface 604, a scroll spring mounting groove 605, a sliding surface 606, a swing angle space 607, and a scroll spring mounting hole 608. The outer flange 702 passes through the scroll spring mounting hole 608, and the inner flange 701 is embedded in the scroll spring fixing shaft 602, and the entire scroll spring 7 is thus installed in the scroll spring mounting groove 605.

[0044] like Figure 1 As shown, the shaft sleeve plate 1 is provided with a semicircular hole 101 and a groove 102. The shaft sleeve plate 1 has two end faces in the material thickness direction, namely, the upper end face and the lower end face. The distance between the two end faces is the thickness of the shaft sleeve plate. Figure 4As shown, a mass block 402 and a middle plate gear 403 are provided on the middle plate 4, and the mass block 402 adjusts the overall mass of the pendulum sub-assembly according to the demand. The planetary gear 6 equipped with the spiral spring 7 is installed in the semicircular hole 101 of the shaft sleeve plate, and the outer flange 702 is embedded in the groove 102 for fixing. The sliding step 603 clamps the upper end face and the lower end face of the shaft sleeve plate 1, and plays the role of axial positioning of the planetary gear 6. The sliding surface 606 contacts the inner hole surface of the semicircular hole 101 of the shaft sleeve plate, generates damping during the operation of the centrifugal pendulum and ensures the normal operation of the planetary gear structure. The outer gear 601 on the planetary gear 6 meshes with the middle plate gear 403, and the movement of the planetary gear ensures that the pendulum sub-assembly has a stable motion trajectory. During the movement of the pendulum sub-assembly, the intermediate plate gear 403 drives the planetary gear 6 to move. During the back-and-forth rotation, the planetary gear 6 drives the volute spring 7 to generate stiffness. The outer flange 703 on the volute spring 7 moves in the swing angle space 607. When the pendulum sub-assembly moves to the extreme position, the volute spring limit surface 703 contacts the planetary gear limit surface 604 to limit the movement space of the pendulum sub-assembly.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A planetary gear type centrifugal pendulum vibration absorber, wherein at least one pendulum subassembly is mounted on a sleeve plate, characterized in that: The shaft sleeve plate is provided with planetary gears having the same number as the pendulum sub-assembly, and the planetary gears are provided with volute springs; The volute spring is provided with an inner flange, an outer flange and a volute spring limiting surface, the outer flange passes through the volute spring mounting hole of the planetary gear, the inner flange is embedded in the volute spring fixing shaft of the planetary gear, the volute spring is installed in the volute spring mounting groove of the planetary gear, the outer flange moves in the swing angle space of the planetary gear, and when the pendulum sub-assembly moves to the extreme position, the volute spring limiting surface contacts the planetary gear limiting surface to control the movement trajectory of the pendulum sub-assembly; The planetary gear is also provided with a sliding step and a sliding surface. The sliding step clamps the upper and lower end surfaces of the shaft sleeve plate to axially position the planetary gear. The sliding surface contacts the inner hole surface of the semicircular hole of the shaft sleeve plate. The intermediate plate gear of the pendulum sub-assembly drives the planetary gear to move. The planetary gear drives the scroll spring to generate additional stiffness and damping during the back-and-forth rotation. The shaft sleeve plate is provided with a semicircular hole and a groove, and the outer flange of the spiral spring is embedded in the groove and fixed; The outer gear of the planetary gear is meshed with the intermediate plate gear of the pendulum sub-assembly, and the movement of the planetary gear controls the movement trajectory of the pendulum sub-assembly.

2. The planetary gear type centrifugal pendulum vibration absorber according to claim 1, characterized in that: The pendulum subassembly includes at least one intermediate plate and at least one pendulum weight. The intermediate plate is provided with a mass block and an intermediate plate gear. The mass block adjusts the overall mass of the pendulum subassembly according to demand.

3. The planetary gear type centrifugal pendulum vibration absorber according to claim 2, characterized in that: The pendulum subassembly is assembled with the shaft sleeve plate through at least one roller, and the roller passes through the fixing holes on the shaft sleeve plate and the pendulum weight block respectively.

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