JP2016138611A - Torsional vibration reduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsional vibration reduction device which inhibits limitation on a transmission gear ratio to improve a vibration suppression function at a low rotation number.SOLUTION: A torsional vibration reduction device includes: a planetary gear mechanism 3 having a carrier 7 holding a stepped pinion 4 and connected to an output member 2, a first sun gear 8 configured to engage with a first pinion gear 5, a ring gear 9 configured to engage with the first pinion gear 5, and a second sun gear 10 configured to engage with a second pinion gear; a spring damper mechanism 11 configured to connect the ring gear 9 to an input member 12; a clutch mechanism 13 selectively connecting the second sun gear 10 to the input member 12; and a brake mechanism 14 selectively fixing the first sun gear 8. A least one of the ring gear 9 connected to the input member 12 through the spring damper mechanism 11 and the first sun gear 8 selectively fixed by the brake mechanism 14 is formed so as to generate an inertial force.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus for reducing torsional vibration, and more particularly to a torsional vibration reducing apparatus capable of switching between a state in which an inertial force that performs a damping action is applied and a state in which the inertial force is not applied.

  An example of this type of device is described in Patent Document 1. An example of the device is configured to selectively connect an inertia (flywheel) that is an inertial body. A buffer member such as a spring damper is provided between the output shaft and the input shaft, and the output shaft and the planetary mechanism carrier are connected to the output side member of the buffer member. The carrier holds the pinion rotating element meshing with the sun rotating element so as to rotate and revolve. An inerter is connected to the sun rotating element via a centrifugal clutch. In this device, when the engine speed is lower than the set speed, the centrifugal clutch is engaged and the sun gear and the inertial body rotate together. When the torque fluctuates in this state, the rotation speed of the inerter changes, and an inertial force corresponding to the acceleration at that time and the inertial moment of the inertia is generated, and the torque fluctuation is reduced by the inertial force. On the other hand, when the engine speed is higher than the set speed, the centrifugal clutch is disengaged and the inerter is disconnected from the output shaft, so that the damping action by the inerter does not occur. In this case, the torque fluctuation is reduced by the elastic force of the buffer member.

  Patent Document 2 describes a torsional vibration reducing device including a single pinion type planetary gear mechanism. An inertial body is integrally connected to the sun gear of the planetary gear mechanism, and the output shaft of the engine is connected to the carrier via a damper constituted by an elastic member such as a coil spring. The input shaft of the transmission is connected to the carrier. The ring gear is configured to be selectively fixed by a brake. In this device, when the engine speed is a predetermined low speed, the brake is operated and the ring gear is fixed, thereby increasing the inertial mass acting on the input shaft of the transmission and increasing the torque fluctuation. Is reduced. Further, if the brake is released, the inertial body does not rotate, so that the damping action by the inertial body can be released.

JP 2012-225482 A JP 2010-1905 A

  The planetary mechanism or the planetary gear mechanism in the devices described in Patent Document 1 and Patent Document 2 described above is configured to connect the inertial mass body to an output shaft or the like. In other words, although these planetary mechanisms and planetary gear mechanisms have a speed change function, they are not configured to function as a transmission between the input shaft and the output shaft. For this reason, in the conventional apparatus described above, functions added to the increase in the number of parts are limited, so there is room for improvement in terms of improving the usability of the apparatus.

  The present invention has been made paying attention to the technical problem described above, and can function as a transmission between the input member and the output member, and can be used for damping without being restricted by the gear ratio. It is an object of the present invention to provide a torsional vibration reducing device capable of setting the inertial force of the motor.

  In order to achieve the above object, the present invention provides a torsional vibration reduction device configured to apply an inertial force in a direction to suppress vibration of an input torque, the number of teeth being different from each other and on the same axis. A stepped pinion composed of a first pinion gear and a second pinion gear which are arranged and connected to each other, holds the stepped pinion so as to rotate and revolve, and is connected to an output member; and a first sun gear meshing with one of the pinion gears A first ring gear meshing with one of the first pinion gear and the second pinion gear, and a second gear meshing with a pinion gear other than the pinion gear meshed with the first sun gear among the first pinion gear and the second pinion gear. The first ring of the sun gear or the first pinion gear and the second pinion gear A planetary gear mechanism having a second ring gear meshing with a pinion gear other than the pinion gear meshing with the gear, and any one of the first sun gear, the first ring gear, the second sun gear, and the second ring gear as an input member The first sun gear, the first ring gear, and the second sun gear or the second ring gear, which are connected to any one of the gears via the stepped pinion. A clutch mechanism that selectively connects one of the other gears to the input member, and the one and the other of the first sun gear, the first ring gear, the second sun gear, and the second ring gear. A brake mechanism for selectively fixing gears other than one gear, and the input member via the spring damper mechanism. At least one of the connected gear or the member integrated with the gear and the gear selectively fixed by the brake mechanism or the member integrated with the gear is the inertial force. It is comprised so that it may generate | occur | produce.

  According to the present invention, by engaging the clutch mechanism and releasing the brake mechanism, torque is input from the two gears to the planetary gear mechanism, and the planetary gear mechanism as a whole is directly connected to rotate. It becomes a state. In that case, when the gear connected to the brake mechanism runs idle and torque fluctuation occurs, the gear generates an inertial force corresponding to angular acceleration and mass (moment of inertia), and performs a damping action. The angular acceleration and angular velocity are determined based on the gear ratio between the gear connected to the spring damper mechanism and the gear connected to the clutch, but the gear ratio does not determine the gear ratio. The rotational speed having a high vibration damping effect can be set to a desired rotational speed without being particularly restricted by the speed ratio set by the planetary gear mechanism. Further, by releasing the clutch mechanism and engaging the brake mechanism, a gear stage having a predetermined gear ratio is set. In that case, the gear ratio becomes a gear ratio different from the gear ratio that defines the idling speed of the gear that has generated the inertial force. In other words, in the present invention, the gear ratio for generating the inertial force for damping and the gear ratio for setting the shift speed are made independent by the stepped pinion, so that the gear ratio and the damping performance are not affected. It is possible to satisfy both requirements.

It is a skeleton figure which shows an example of the torsional vibration reduction apparatus which concerns on this invention. It is a schematic diagram which shows the torsional vibration reduction apparatus shown in FIG. 1 as a vibration model. It is a figure which shows the result of having measured the vibration transmissibility about this invention example and two comparative examples.

  FIG. 1 is a skeleton diagram showing an example of a torsional vibration reducing device according to the present invention. The example shown here is an example configured to reduce vibration of torque transmitted from the engine 1 to the transmission 2, and is configured mainly by the stepped pinion type planetary gear mechanism 3. The stepped pinion 4 is a pinion in which two pinion gears 5 and 6 having different numbers of teeth are connected on the same axis and held by a carrier 7 so as to be able to rotate and revolve. One of the pinion gears (hereinafter referred to as a first pinion gear) 5 is engaged with a sun gear (hereinafter referred to as a first sun gear) 8 and a ring gear 9 disposed concentrically with the first sun gear 8. Yes. Accordingly, the first sun gear 8, the first pinion gear 5, and the ring gear 9 constitute a single pinion type planetary gear mechanism. Further, another sun gear (hereinafter, temporarily referred to as a second sun gear) 10 is engaged with the other pinion gear (hereinafter, temporarily referred to as a second pinion gear) 6.

  The ring gear 9 is connected to the input member 12 via a spring damper mechanism 11. This input member 12 is a flywheel attached to the output shaft of the engine 1, for example. The spring damper mechanism 11 may be a general damper mechanism that is used together with a clutch or the like on the output side of the engine 1, and is a coil in which a driving member and a driven member are arranged in a circumferential direction. It is a mechanism configured to be connected via a spring. The input member 12 and the second sun gear 10 described above are connected via a clutch mechanism 13. The clutch mechanism 13 may be a conventionally known clutch mechanism such as a friction engagement mechanism or a meshing engagement mechanism. For example, the clutch mechanism 13 is electrically controlled or controlled by hydraulic pressure, and the input member 12 and the second sun gear 10. Are connected so that torque can be transmitted, and the connection is released. Further, a brake mechanism 14 that selectively stops (fixes) the rotation of the second sun gear 10 is provided. The brake mechanism 14 suffices to be able to stop the rotation of the second sun gear 10 in the negative direction (rotation in the direction opposite to the rotation direction of the engine 1), and therefore, in both positive and negative directions such as a friction brake and a meshing brake. Not only the brake mechanism that stops the rotation, but also a one-way brake may be used.

  The torsional vibration reducing device shown in FIG. 1 operates as follows. First, in a state where the clutch mechanism 13 is released, torque output from the engine 1 is transmitted from the input member 12 to the ring gear 9 via the spring damper mechanism 11. When torque in the positive rotation direction acts on the ring gear 9 in this way, torque in the negative rotation direction acts on the first sun gear 8. Since the first sun gear 8 is stopped from rotating in the negative rotation direction by the brake mechanism 14, the torque in the positive rotation direction is transmitted to the carrier 7, and the torque is transmitted to the transmission 2. Therefore, the carrier 7 or a member connected to the carrier 7 is an output member, and the rotational speed thereof is lower than the input rotational speed that is the rotational speed of the ring gear 9, and the planetary gear mechanism 3 functions as a speed reducer. . The speed ratio is represented by “1 + ρ” when the ratio of the number of teeth of the first sun gear 8 and the ring gear 9 (gear ratio) is “ρ”, and this speed stage is a so-called low speed stage.

  On the other hand, when the clutch mechanism 13 is engaged, the torque of the engine 1 is transmitted to the ring gear 9 and the second sun gear 10. Therefore, in the planetary gear mechanism 3, since the two rotating elements rotate at the same speed in the same direction, the entire planetary gear mechanism 3 rotates as a unit, and the gear ratio becomes “1”. This is a so-called direct connection stage or high-speed stage. Therefore, the engine speed is lower than that when the low speed stage is set. At this high speed stage, torque in the forward rotation direction acts on the first sun gear 8, so that the brake mechanism 14 is released and the first sun gear 8 rotates forward. When the input torque (engine torque) fluctuates or vibrates in this state, the second sun gear 10 is connected to the input member 12 by the clutch mechanism 13 and the rotational speed thereof is the same as the engine rotational speed. Since the spring damper mechanism 11 disposed between the input member 12 and the input member 12 compresses the coil spring to cause twisting, the rotational speed or rotational angle of the ring gear 9 is different from that of the second sun gear 10. When such relative rotation between the second sun gear 10 and the ring gear 9 occurs, the first sun gear 8 rotates relative to the ring gear 9 and the second sun gear 10 accordingly. Such a change in the rotation speed or rotation angle of the first sun gear 8 is caused by the vibration of the engine torque, and the inertial torque (in accordance with the angular acceleration and the inertial moment of the first sungear 8 and a member integral therewith) ( Inertia force).

  FIG. 2 is a schematic diagram illustrating the torsional vibration reducing device shown in FIG. 1 as a vibration model, where K1 is a spring coefficient of the spring damper mechanism 11, K2 is a spring coefficient on the output side of the transmission 2, and I1 is an input member 12. I2 is the moment of inertia of the ring gear 9, I3 is the moment of inertia of the transmission 2, I4 is the moment of inertia of the first sun gear 8, ρ is the gear ratio between the first sun gear 8 and the ring gear 9, as described above, ρa represents a gear ratio between the second sun gear 10 and the ring gear 9. The vibration of the input torque is represented by the reciprocating motion of the input member 12 in the left-right direction in FIG. 2, and when the input torque vibrates, the springs in the spring damper mechanism 11 expand and contract. Therefore, the sun gears 8 and 10 and the ring gear 9 The straight lines connecting the points indicating the carrier 7 move in the left-right direction in FIG. 2 and reciprocate at a predetermined angle around the point indicating the carrier 7. As shown in FIG. 2, the first sun gear 8 that functions as an inertial mass body is located farthest from the point of the carrier 7 that is the center of rotation, and has a large radius of reciprocating rotation. That is, the angular acceleration and angular velocity of the first sun gear 8 when the torque vibrates are larger than the angular acceleration and angular velocity of the ring gear 9 and the input member 12 (second sun gear 10). Since the inertia torque (inertial force) is obtained as the product of the mass and the angular acceleration, the first sun gear 8 generates a large inertia torque (inertial force) with a small mass due to the large angular acceleration caused by the torque fluctuation. To do. This is the same action as increasing the mass of the inertial mass body that performs the vibration damping action. Therefore, according to the torsional vibration reducing device according to the present invention shown in FIG. 1, the engine speed is low. The vibration control performance is improved.

  FIG. 3 shows the calculation results of the vibration transmissibility between the inventive example and the comparative example. The example of the present invention is an example configured as shown in FIG. 1, the comparative example 1 is an example in which damping is performed only by a spring damper mechanism without providing an inertia mass body, and the comparative example 2 is a step in the present invention example. This is an example in which a single pinion type planetary gear mechanism is used in place of the dopinion type planetary gear mechanism. As is apparent from the measurement result of Comparative Example 2, by causing the predetermined rotating element of the planetary gear mechanism to function as an inertial mass body, the vibration transmissibility at a predetermined engine speed is reduced and the damping performance is improved. On the other hand, in the example of the present invention, the inertial force of the rotating element (first sun gear 8 described above) that functions as an inertial mass body increases, so that the vibration transmissibility at a lower rotational speed is higher than in the case of Comparative Example 2. The vibration damping performance at a low rotational speed is improved. Moreover, since such an effect can be obtained without increasing the mass, an increase in the size of the torsional vibration reducing device can be prevented or suppressed.

  In addition, this invention is not limited to embodiment mentioned above. That is, the stepped pinion type planetary gear mechanism includes at least four rotating elements described above, and an input element, an output element, a fixed element, or a reaction force element can be appropriately selected from these rotating elements. Therefore, in the present invention, changes such as connecting the first sun gear 8 to the spring damper mechanism 11 in place of the ring gear 9 and connecting the ring gear 9 to the brake mechanism 14 may be made as appropriate. Further, one sun gear and two ring gears may be provided.

  DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Transmission, 3 ... Stepped pinion type planetary gear mechanism, 4 ... Stepped pinion, 5, 6 ... Pinion gear, 7 ... Carrier, 8, 10 ... Sun gear, 9 ... Ring gear, 11 ... Spring damper mechanism 12 ... Input member, 13 ... Clutch mechanism, 14 ... Brake mechanism.

Claims (1)

In a torsional vibration reduction device configured to apply an inertial force in a direction to suppress vibration of input torque,
Either a carrier having a number of teeth different from each other and holding a stepped pinion composed of a first pinion gear and a second pinion gear connected on the same axis and capable of rotating and revolving and connected to an output member, either Of the first sun gear meshed with the first pinion gear, the first ring gear meshed with one of the first pinion gear and the second pinion gear, and the first sun gear among the first pinion gear and the second pinion gear. A planetary gear mechanism having a second sun gear meshing with a pinion gear other than a pinion gear or a second ring gear meshing with a pinion gear other than the pinion gear meshed with the first ring gear of the first pinion gear and the second pinion gear;
A spring damper mechanism that connects any one of the first sun gear, the first ring gear, the second sun gear, and the second ring gear to an input member;
The other one of the first sun gear, the first ring gear, the second sun gear, and the second ring gear, which is connected to the one gear through the stepped pinion, A clutch mechanism selectively coupled to the input member;
A brake mechanism that selectively fixes a gear other than the one gear and the other one gear among the first sun gear, the first ring gear, and the second sun gear or the second ring gear;
The gear connected to the input member via the spring damper mechanism or a member integrated with the gear and the gear selectively fixed by the brake mechanism or the gear integrated with the gear A torsional vibration reduction device, wherein at least one of the members is configured to generate the inertial force.

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