JP2014001753A - On-vehicle power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle power transmission device that allows energy stored in a fly wheel 42 in kinetic energy of a vehicle to be preferably increased.SOLUTION: The on-vehicle power transmission device includes: a planetary gear mechanism 40 having a sun gear S, a carrier C, and a ring gear R which are connected to an input shaft 42a, a driving wheel 18, and a torque adjustment 44, respectively; and a second alternator 48 connected to the input shaft 42a. In the device, regenerative control is processed which stores the kinetic energy of the vehicle in the fly wheel 42 through the planetary gear mechanism 40 and the input shaft 42a under the situation where power production of an engine 10 is not indicated. On the condition of such a configuration, the second alternator 48 has characteristics such that a current is not produced which can be output to the outside from itself when a rotational speed of the input shaft 42a is equal to or lower than a specified speed.

Description

  The present invention relates to an in-vehicle power transmission device including a planetary gear mechanism.

  Conventionally, as seen in, for example, Patent Document 1 below, a rotating shaft that connects a driving wheel and an internal combustion engine, a flywheel that stores rotational energy, and a planetary gear mechanism that enables power transmission between an on-vehicle generator are provided. An in-vehicle power transmission device is known. Specifically, the planetary gear mechanism provided in the power transmission device includes a sun gear, a carrier, and a ring gear connected to the flywheel, the rotating shaft, and the on-vehicle generator, respectively. By using the power transmission device, it is possible to perform a regeneration control process for storing the kinetic energy of the vehicle in the flywheel through a power transmission path from the drive wheel to the flywheel via the planetary gear mechanism.

International Publication No. 2009/010819

  By the way, the kinetic energy stored in the flywheel via the planetary gear mechanism greatly affects the rotational speeds of the sun gear, the carrier, and the ring gear when the regeneration control process is performed. Specifically, when the rotational speed of the sun gear connected to the flywheel is low, there is a concern that the kinetic energy of the vehicle cannot be sufficiently stored in the flywheel.

  In order to solve these problems and to effectively use the kinetic energy of the vehicle, an energy recovery method capable of increasing the energy stored in the flywheel out of the kinetic energy of the vehicle is required.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a new in-vehicle power transmission device capable of suitably increasing the energy stored in the flywheel out of the kinetic energy of the vehicle. There is.

  In order to solve the above-mentioned problems, the invention according to claim 1 is applied to a vehicle including a main engine (10) as a driving power source, and can store energy input through the input shaft (42a) as rotational energy. Energy storage means (42), torque adjustment means (44) capable of adjusting torque acting on itself, and drive wheel (18) to enable transmission of power between said input shaft, said drive wheel and said torque adjustment A planetary gear mechanism (40) having a first rotating body (S), a second rotating body (C) and a third rotating body (R) connected to each of the means, and the input shaft; A rotating machine (48) that is supplied with rotational energy stored in the energy storage means and generates power, and in a situation where no power generation instruction is given to the main engine, the vehicle is connected via the planetary gear mechanism and the input shaft. Exercise energy Regenerative processing means for performing regenerative control processing to store the energy in the energy storage means, and the rotating machine generates a current that can be output from itself when the rotational speed of the input shaft is equal to or less than a specified speed. It is characterized by having a characteristic which is not performed.

  In the above-described invention, the kinetic energy of the vehicle is effectively used by supplying the rotating energy stored in the energy storage means by the regeneration control process to the rotating machine to generate electric power. Here, the inventors have obtained the knowledge that the higher the rotational speed of the input shaft of the energy storage means, the greater the energy stored in the energy storage means by the regenerative control process in the kinetic energy of the vehicle. It was.

  That is, there is a proportional relationship between the applied torques of the first to third rotating bodies in a situation where power transmission is performed via the planetary gear mechanism. According to this relationship, in the situation where the regeneration control process is performed, the applied torque of the second rotating body connected to the drive wheels is determined according to the traveling state of the vehicle, whereby the first and third rotating bodies are determined. The applied torque is determined. Further, the kinetic energy of the vehicle supplied from the driving wheel to the energy storage means via the planetary gear mechanism and the input shaft is proportional to the product of the rotational speed of the input shaft and the applied torque of the input shaft. According to this proportional relationship and the application torque of the first to third rotating bodies determined according to the running state of the vehicle, the rotational speed of the input shaft of the energy storage means is high under the situation where the regeneration control process is performed. Indeed, the kinetic energy of the vehicle supplied to the energy storage means can be increased.

  Therefore, in the above invention, the rotating machine is configured to have the above characteristics. For this reason, when the rotational speed of the input shaft is low, it is possible to suppress the rotational energy stored in the energy storage means from being used for power generation of the rotating machine, and the rotational speed of the input shaft becomes excessively low. Can be avoided. That is, the rotational speed of the input shaft when the regeneration control process is started can be maintained at a high level as much as possible. Thereby, when regeneration control processing is performed, the energy stored in the energy storage means can be increased among the kinetic energy of the vehicle.

  Further, in the above invention, for example, when the rotation speed of the input shaft is determined to be equal to or lower than a specified speed by the control device of the rotating machine, the generation of current of the rotating machine is stopped by an instruction from the control device. Thus, the configuration for stopping the generation of current can be simplified.

1 is a system configuration diagram according to a first embodiment. FIG. The block diagram of the alternator concerning the embodiment. Sectional drawing of the flywheel vicinity concerning the embodiment. The figure which shows the arrangement | positioning aspect of the sliding member concerning the embodiment. The figure which shows the output current characteristic of the alternator concerning the embodiment. The alignment chart of the planetary gear mechanism concerning the embodiment. Sectional drawing of the flywheel vicinity concerning 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment in which an in-vehicle power transmission device according to the present invention is applied to a vehicle including only an internal combustion engine as an in-vehicle main engine will be described with reference to the drawings.

  FIG. 1 shows a system configuration according to the present embodiment.

  As illustrated, the engine 10 is an internal combustion engine as an in-vehicle main engine. An output shaft (crankshaft 10 a) of the engine 10 is connected to drive wheels 18 via a transmission 12, a shaft 14, and a differential 16. Note that a starter 22 that applies initial rotation to the crankshaft 10 a is connected to the crankshaft 10 a via a reduction gear mechanism 20. The reduction gear mechanism 20 is a member for making the rotational speed of the crankshaft 10 a lower than the rotational speed of the starter 22.

  A first alternator 26 is connected to the crankshaft 10 a via a belt 24. The first alternator 26 is a three-phase AC generator, and has a function as a power source for in-vehicle auxiliary equipment such as the starter 22 and a function for charging an in-vehicle battery 28 (for example, a lead battery). As shown in FIG. 2, the first alternator 26 includes a rotor 29 that is rotationally driven by the rotational force of the crankshaft 10 a transmitted through the belt 24, a rotor coil 30 provided on the rotor 29, and an outer side of the rotor 29. A stator coil 32, a rectifier circuit 34, and a regulator 36 are provided.

  Specifically, the stator coil 32 is connected to the rectifier circuit 34. The rectifier circuit 34 is for converting an alternating current output from the stator coil 32 into a direct current. One terminal of the rectifier circuit 34 is connected to the output terminal (B terminal) of the first alternator 26, and the other terminal is connected to the regulator 36 and grounded. A battery 28 and an in-vehicle auxiliary machine are connected to the B terminal.

  In such a configuration, the electric power generated by the first alternator 26 is adjusted by adjusting the exciting current (hereinafter, field current If) flowing through the rotor coil 30 by the regulator 36. Specifically, the generated power tends to increase as the load torque of the first alternator 26 increases or the rotation speed of the first alternator 26 increases by adjusting the field current If.

  In the present embodiment, as the first alternator 26, a so-called self-excited type that covers the field current If flowing in the rotor coil 30 with a part of the output current Idc of the rectifier circuit 34 is used. Therefore, the final output current Iout that is a current that can be output from the first alternator 26 to the outside (battery 28 or the like) is a value obtained by subtracting the field current If from the output current Idc of the rectifier circuit 34.

  Returning to the description of FIG. 1, the planetary gear mechanism 40 is connected to the shaft 14 through the speed increasing gear mechanism 38. The planetary gear mechanism 40 is a rotating body that rotates in conjunction with each other, and can transmit power between the drive wheel 18 (shaft 14), the input shaft 42a that serves as the rotation shaft of the flywheel 42, and the torque adjusting device 44. The carrier C, the sun gear S, and the ring gear R are provided. Specifically, the shaft 14 is connected to the carrier C via the speed increasing gear mechanism 38, and the input shaft 42 a is connected to the sun gear S via the one-way clutch 46, the second alternator 48 and the speed increasing gear mechanism 50. A torque adjusting device 44 is connected to the ring gear R. The speed increasing gear mechanism 38 is a member for making the rotational speed of the carrier C higher than the rotational speed of the shaft 14, and the speed increasing gear mechanism 50 is the rotational speed of the flywheel 42 than the rotational speed of the sun gear S. This is a member for increasing (the rotational speed of the input shaft 42a).

  The torque adjusting device 44 is torque adjusting means capable of adjusting the torque acting on itself. In the present embodiment, an electromagnetic brake including a clutch mechanism having a pair of friction plates and an electromagnetic coil is used as the torque adjusting device 44. The torque adjusting device 44 imparts torque to the ring gear R in a direction that prevents rotation of the ring gear R by friction between the pair of friction plates caused by energizing the electromagnetic coil.

  The one-way clutch 46 transmits torque from the sun gear S side to the second alternator 48 side only when the relative rotational speed of the sun gear S with respect to the rotational speed of the second alternator 48 is not negative, and the relative rotational speed becomes negative. Is a one-way transmission mechanism having a function of not transmitting torque from the sun gear S side to the second alternator 48 side. According to the one-way clutch 46, it is possible to prevent the rotational energy once stored in the flywheel 42 from being transmitted to the sun gear S. Thereby, it is possible to suppress as much as possible that the rotational energy stored in the flywheel 42 is consumed by other than the power generation of the second alternator 48. The relative rotational speed is more specifically a value obtained by subtracting the rotational speed of the second alternator 48 from the rotational speed of the sun gear S.

  Similar to the first alternator 26, the second alternator 48 has a function as a power source for the in-vehicle auxiliary machine, a function of charging the battery 28, and the like. In the present embodiment, as the second alternator 48, a self-excited type is used like the first alternator 26 (see FIG. 2 above). For this reason, the electric power generated by the second alternator 48 tends to increase as the load torque of the second alternator 48 increases or the rotation speed of the second alternator 48 increases by adjusting the field current If.

  The flywheel 42 is energy storage means for storing the input rotational energy as it is. In this embodiment, the flywheel 42 is made of iron.

  Note that the flywheel 42, the planetary gear mechanism 40, the torque adjusting device 44, and the like are actually housed and integrally formed in a housing.

  Next, the configuration in the vicinity of the flywheel 42 housed in the housing will be described in detail with reference to FIG. Here, FIG. 3 is a cross-sectional view of the vicinity of the flywheel 42 when the flywheel 42 and the like are cut along a plane parallel to the central axis Ls of the input shaft 42a and passing through the central axis Ls.

  As illustrated, the flywheel 42 is accommodated in housings 52a and 52b. In this embodiment, the housings 52a and 52b are made of aluminum and die-cast.

  A pair of bearings 54 is fixed to the housing 52a. The input shaft 42 a connected to the speed increasing gear mechanism 50 is rotatably supported by a pair of bearings 54. That is, in this embodiment, the flywheel 42 is cantilevered. In the present embodiment, a rolling bearing provided with an inner ring, an outer ring, and rolling elements (such as balls or rollers) is used as the bearing 54.

  In addition to the input shaft 42a, the flywheel 42 includes a first cylindrical portion 42b and a second cylindrical portion 42c, and is integrally configured. In the drawing, a broken line is shown on the flywheel 42 for discrimination of the input shaft 42a, the first cylindrical portion 42b, and the second cylindrical portion 42c.

  The first cylindrical portion 42b is a cylindrical portion adjacent to the input shaft 42a in the flywheel 42, and the central axis of the first cylindrical portion 42b coincides with the central axis Ls of the input shaft 42a.

  The second cylindrical portion 42c is a cylindrical portion adjacent to the first cylindrical portion 42b of the flywheel 42, and the central axis of the second cylindrical portion 42c is the central axis Ls of the input shaft 42a. Match. The second cylindrical portion 42c is formed so as to extend from the radial end portion of the first cylindrical portion 42b in one direction parallel to the central axis Ls direction of the input shaft 42a.

  A seal member 56 (for example, a lip seal) is fixed to the housing 52a. The seal member 56 is an annular member, and is a member for partitioning the vicinity of the first cylindrical portion 42b and the second cylindrical portion 42c and the other portions. In the configuration including the seal member 56, the friction loss between the flywheel 42 and the surrounding gas caused by the rotation of the flywheel 42 by reducing the pressure in the vicinity of the first cylindrical portion 42b and the second cylindrical portion 42c. Can be reduced. Thereby, the reduction | decrease of the rotational energy once stored in the flywheel 42 can be suppressed. An example of a technique for reducing the pressure in the vicinity of the first cylindrical part 42b and the second cylindrical part 42c is a technique of introducing a negative pressure in the intake passage connected to the engine 10.

  Further, a sliding member 58, which is one of characteristic features according to the present embodiment, is fixed to the housing 52a. The sliding member 58 is an annular member, and when the rotational speed of the flywheel 42 is about to exceed the allowable upper limit speed (for example, 45000 rpm) for some reason, the rotational speed of the flywheel 42 is limited by the allowable upper limit speed. It is a member to do. Here, the allowable upper limit speed is an upper limit value of the rotational speed of the flywheel 42 that can maintain the reliability of the flywheel 42. Hereinafter, the arrangement | positioning aspect of the sliding member 58 is explained in full detail using FIG.

  FIG. 4 is an enlarged view of the vicinity of the sliding member 58 in FIG. In FIG. 4, for the sake of convenience, the flywheel 42 is not shown with hatching indicating a cross section. Further, in FIG. 4, the flywheel 42 in a stationary state is indicated by a solid line, and the flywheel 42 when the rotational speed of the flywheel 42 is an allowable upper limit speed is indicated by a broken line.

  As shown in the figure, when the flywheel 42 is in a stationary state, a surface parallel to a plane perpendicular to the central axis Ls of the input shaft 42a among the surfaces of the second cylindrical portion 42c is defined as the first surface S1. A portion of the surface of the housing 52a that faces the first surface S1 is defined as a second surface S2. When the flywheel 42 is in a stationary state, a surface (outer peripheral surface) parallel to the central axis Ls of the input shaft 42a is defined as the third surface S3 in the surface of the second cylindrical portion 42c, and the housing A portion of the surface of 52b that faces the third surface S3 is defined as a fourth surface S4.

  Here, in the present embodiment, the first surface S1 (more specifically, before the third surface S3 and the fourth surface S4 come into contact with each other in a situation where the rotational speed of the flywheel 42 is the allowable upper limit speed. Specifically, the sliding member 58 is fixed in the vicinity of the second surface S2 of the housing 52a so that the input surface 42a side of the first surface S1 and the sliding member 58 are in contact with each other. This is to avoid a significant decrease in the reliability of the flywheel 42 and the like.

  That is, when the flywheel 42 rotates at a high speed and centrifugal force acts on the flywheel 42, as shown by the broken line in the figure, the vicinity of the boundary between the first cylindrical portion 42b and the second cylindrical portion 42c is used as a base point. The second cylindrical portion 42c is deformed toward the radially outer side of the second cylindrical portion 42c. Therefore, the third surface S3 of the second cylindrical portion 42c approaches the fourth surface S4 of the housing 52b, and the first surface S1 of the second cylindrical portion 42c is of the housing 52a. It will approach 2nd surface S2.

  Here, when the flywheel 42 and the housing are in contact with each other, the lower the peripheral speed of the flywheel 42 at these contact points, the less the wear of the flywheel 42 and the housing at the contact points. The degree of decrease in reliability is reduced. For this reason, in order to avoid the large reduction in the reliability, it is desirable to bring the flywheel 42 and the housing into contact with each other at a place where the peripheral speed of the flywheel 42 is lowered.

  In view of these points, the sliding member 58 is fixed at the position described above. For this reason, when the rotational speed of the flywheel 42 tends to exceed the allowable upper limit speed, the first surface S <b> 1 having a relatively low peripheral speed of the flywheel 42 and the sliding member 58 can be brought into contact with each other. Thereby, it can avoid that reliability of flywheel 42 grade falls greatly.

  As the sliding member 58, it is desirable to use a material having excellent wear resistance. Specifically, a layer having excellent wear resistance such as Teflon (registered trademark) or diamond-like carbon is used as the sliding member 58. What is formed on the surface of this may be used.

  Returning to the description of FIG. 1, the control device 60 is mainly composed of a microcomputer including a well-known CPU, ROM, RAM, etc., with the vehicle as a control target. The control device 60 receives an output signal from a brake sensor 64 or the like that detects a user's operation amount of the brake pedal 62 (hereinafter referred to as a brake operation amount). The control device 60 executes various control programs stored in the ROM in response to the input, thereby starting control processing by the starter 22, combustion control processing of the engine 10, and further, the first alternator 26 and the second alternator 26. Power generation control processing by the alternator 48 is performed.

  In particular, the control device 60 performs a regeneration control process. This process stores the kinetic energy of the vehicle in the flywheel 42 via the planetary gear mechanism 40 and the one-way clutch 46 or supplies it to the second alternator 48 under a situation where the brake operation (braking instruction of the vehicle) is performed by the user. It is a process for. According to this process, the second alternator 48 is forcibly generated using the rotational energy stored in the flywheel 42 or the rotational energy input via the one-way clutch 46 and the first alternator 26 generates power. Can be stopped. Thereby, for example, the frequency at which the first alternator 26 is subsequently driven for the operation of the electric device can be reduced, and the fuel consumption reduction effect of the engine 10 can be enhanced.

  When the regeneration control process is performed, torque is applied to the ring gear R by the torque adjusting device 44 so as to enable torque transmission between the drive wheel 18 and the flywheel 42 via the planetary gear mechanism 40. . Whether or not the brake operation is performed may be determined based on the output value of the brake sensor 64.

  Incidentally, as a situation where the regeneration control process is performed, not only a situation where the vehicle decelerates due to the brake operation but also a situation where the vehicle runs downhill while maintaining a predetermined traveling speed by the brake operation, for example. This is because the well-known fuel cut control may be executed even when the vehicle travels downhill.

  Subsequently, an output current characteristic of the second alternator 48 which is a characteristic configuration according to the present embodiment will be described.

  In the present embodiment, when the rotational speed of the input shaft 42a is equal to or lower than the specified speed, a characteristic that does not generate a current that can be output from the second alternator 48 to the outside (such as the battery 28) without giving an instruction from the control device 60. The second alternator 48 is configured to have That is, as shown in FIG. 5, the second alternator 48 has an alternator rotational speed n which is a value obtained by dividing the rotational speed of the input shaft 42a by the speed increasing ratio of the speed increasing gear mechanism 50, and the specified speed is increased by the speed increasing gear mechanism. The final output current Iout is configured to have a characteristic of “0” until the rising rotational speed n0, which is a value divided by the speed increase ratio of 50, is exceeded. Here, the specified speed is to increase the fuel consumption reduction effect of the engine 10 by using the rotational energy accumulated in the flywheel 42 in the second alternator 48, and to increase the rotational speed of the flywheel 42. Is set from the viewpoint of enhancing the recovery efficiency of the kinetic energy of the vehicle during the regeneration control process.

  Specifically, the rising rotational speed n0 is expressed by the following equation (c1) using the magnetic flux density B, the outer diameter D of the rotor 29 of the second alternator 48, the length l of the stator coil 32, and the resistance r of the stator coil 32. It is expressed in

n0 = r / (3 × B × D × l) × {Vdc / (r × √3) + If} (c1)
For this reason, the rising rotation speed n0 is determined by adjusting the outer diameter D of the rotor 29 and the length l of the stator coil 32 (the number of turns of the stator coil 32), for example.

  In the figure, a numerical expression representing the output current characteristic of the second alternator 48 when the alternator rotational speed n is low and the output current characteristic of the second alternator 48 when the alternator rotational speed n is high are shown. The mathematical formula is also shown. Here, the inductance L of the stator coil 32, the output voltage Vdc of the rectifier circuit 34, and the circumference ratio π are used. These characteristics are described in detail in, for example, “Engine Electrical Components Engine Electrical Components Study Group, Sankaido Co., Ltd., May 1, 2002, p.125-127”.

  The above-described configuration of the second alternator 48 is a configuration for increasing the kinetic energy of the vehicle supplied to the flywheel 42 when the regeneration control process is performed. Hereinafter, the reason why the kinetic energy of the vehicle supplied to the flywheel 42 is increased and the reason why the above-described configuration of the second alternator 48 is employed to increase the amount of kinetic energy supplied to the flywheel 42 will be described. .

  First, the reason why the kinetic energy of the vehicle supplied to the flywheel 42 increases will be described with reference to FIG. Specifically, FIG. 6 is a collinear diagram of the rotational speeds of the sun gear S, the carrier C, and the ring gear R of the planetary gear mechanism 40. In the figure, the arrow indicates the direction of torque. As with the rotational speed, the torque direction is positive on the upper side in the figure, thereby defining the sign of power when power is input to the planetary gear mechanism 40 as positive.

  There is a proportional relationship among the applied torques of the sun gear S, the carrier C, and the ring gear R under the situation where power transmission is performed via the planetary gear mechanism 40. Specifically, the relationship between the applied torque Ts of the sun gear S, the applied torque Tc of the carrier C, and the applied torque Tr of the ring gear R is the ratio ρ (Zs / Zr) of the number of teeth Zs of the sun gear S to the number of teeth Zr of the ring gear R. Is expressed by the following formulas (c2) and (c3).

Tr = −Tc / (1 + ρ) (c2)
Ts = −ρTc / (1 + ρ) (c3)
According to this relationship, the application torque Tc of the sun gear S and the application torque Tr of the ring gear R are determined by determining the application torque Tc of the carrier C according to the traveling state of the vehicle in a situation where the regeneration control process is performed. It will be. Here, the ratio between the applied torque Ts of the sun gear S and the applied torque Tr of the ring gear R is determined by the ratio ρ of the number of teeth Zs of the sun gear S to the number of teeth Zr of the ring gear R. Each of the rotational speed Nc of the carrier C, the rotational speed Ns of the sun gear S, and the rotational speed Nr of the ring gear R is required to satisfy the relationship represented by the following expression (c4).
Nr = (1 + ρ) × Nc−ρ × Ns (c4)
Further, the kinetic energy of the vehicle supplied from the driving wheel 18 to the flywheel 42 via the planetary gear mechanism 40 increases the rotational speed of the flywheel 42 and the input torque to the flywheel 42 (the applied torque Ts of the sun gear S). The torque divided by the speed increase ratio of the gear mechanism 50). According to this proportional relationship and the applied torque of the sun gear S, the carrier C, and the ring gear R determined according to the running state of the vehicle, the vehicle supplied to the flywheel 42 as the rotational speed of the flywheel 42 increases. This increases the kinetic energy.

  Next, the reason why the above-described configuration of the second alternator 48 is employed to increase the amount of vehicle kinetic energy supplied to the flywheel 42 will be described.

  In order to increase the recovery efficiency of the kinetic energy of the vehicle by the regenerative control process, it is effective to stop the power generation of the second alternator 48 when the rotational speed of the flywheel 42 is equal to or lower than the specified speed. That is, it is effective to employ a configuration that can output current from the second alternator 48 to the outside when the rotational speed of the flywheel 42 exceeds a specified speed.

  As such a configuration, for example, a rotation speed sensor that detects the rotation speed of the flywheel 42 is provided, and when the control apparatus 60 determines that the rotation speed detected by the sensor is equal to or less than a specified speed, the control apparatus 60. It is also conceivable to adopt a configuration in which the power generation of the second alternator 48 is stopped by this instruction. However, in this case, a control device (such as a rotation speed sensor) for stopping power generation is required, and it is required to add a control logic for stopping power generation.

  On the other hand, if the configuration of the second alternator 48 according to the present embodiment is adopted, a fly speed can be achieved without providing a rotation speed sensor and without adding control logic for stopping the power generation of the second alternator 48. When the rotational speed of the wheel 42 becomes low, the power generation of the second alternator 48 for generating the final output current Iout can be stopped. Therefore, when constructing a vehicle kinetic energy recovery system, the number of parts can be reduced, the cost can be reduced, the weight of the system can be reduced, and the increase in the size of the system can be avoided. can do.

  Furthermore, since it is not necessary to provide a rotation speed sensor, there is a possibility that the power generation of the second alternator 48 cannot be stopped when the rotation speed of the flywheel 42 becomes a specified speed or less due to a failure of the rotation speed sensor, for example. Disappear.

  For this reason, in the present embodiment, the above-described configuration of the second alternator 48 is employed.

  Incidentally, when the alternator rotational speed n rises and falls below the rotational speed n0, the final output current Iout becomes “0”, but the stored energy of the flywheel 42 is consumed to generate the field current If. . However, the present inventors have investigated that the amount of consumption is very small, and the amount of decrease in the rotational speed of the flywheel 42 due to the generation of the field current If is very small.

  According to the embodiment described in detail above, the following effects can be obtained.

  (1) The rising rotational speed n0 of the second alternator 48 is set to a value obtained by dividing the specified speed by the speed increasing ratio of the speed increasing gear mechanism 50. For this reason, the rotational speed of the flywheel 42 when the regeneration control process is started can be maintained at a high level as much as possible. Thereby, when regeneration control processing is performed, the energy stored in flywheel 42 among the kinetic energy of vehicles can be increased suitably. Furthermore, such an effect can be realized with a simple configuration.

  (2) A one-way clutch 46 is provided between the sun gear S and the second alternator 48. For this reason, it is possible to avoid the rotational energy once stored in the flywheel 42 from being released through the planetary gear mechanism 40 with a simple configuration without electronic control.

  (3) The sliding member 58 is provided in the housing 52a. For this reason, even when the rotational speed of the flywheel 42 is about to exceed the allowable upper limit speed due to some factor, it is possible to avoid the reliability of the flywheel 42 and the like from greatly decreasing.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment.

  In this embodiment, it replaces with the structure which cantilever-supports the flywheel 42, and changes to the structure which supports both ends.

  FIG. 7 shows a configuration in the vicinity of the flywheel 42 according to the present embodiment. In FIG. 7, the same members as those shown in FIG. 3 are given the same reference numerals for the sake of convenience.

  As illustrated, the flywheel 42 is accommodated in housings 52a, 52b, and 52c.

  A bearing 66a is fixed to the housing 52a, and a bearing 66b is fixed to the housing 52c. The input shaft 42a is rotatably supported by these bearings 66a and 66b. That is, in this embodiment, the flywheel 42 is supported at both ends. In the present embodiment, rolling bearings are used as the bearings 66a and 66b in the same manner as in the first embodiment.

  The second cylindrical portion 42c of the flywheel 42 is formed so as to extend in the two directions parallel to the central axis Ls direction of the input shaft 42a from the radial end portion of the first cylindrical portion 42b. .

  Here, in this embodiment, the sliding member 70a is fixed to the housing 52a, and the sliding member 70b is fixed to the housing 52c. These sliding members 70a and 70b are arranged by a method similar to the method described in FIG.

  Incidentally, seal members 68a and 68b are fixed to the housings 52a and 52c. Further, according to the above-described both-end support structure of the flywheel 42, the second cylindrical portion 42c in the direction of the central axis Ls of the input shaft 42a can be shortened while maintaining the moment of inertia of the flywheel 42. Thereby, when the flywheel 42 is rotated at a high speed, the stress acting near the boundary between the first cylindrical portion 42b and the second cylindrical portion 42c can be reduced, and the second cylindrical portion 42c The amount of deformation toward the outside in the radial direction can be reduced.

  Also according to the present embodiment described above, it is possible to avoid a large decrease in reliability of the flywheel 42 and the like when the rotational speed of the flywheel 42 is about to exceed the allowable upper limit speed.

(Other embodiments)
Each of the above embodiments may be modified as follows.

  The torque adjusting means is not limited to one provided with an electromagnetic brake, and may be an alternator, for example. In this case, by increasing the generated power of the alternator, the torque acting on the alternator can be increased and the applied torque to the ring gear R can be increased.

  In the first embodiment, the torque adjusting device 44 may be connected to the sun gear S of the planetary gear mechanism 40 and the input shaft 42 a may be connected to the ring gear R via the one-way clutch 46.

  In the first embodiment, in place of the sliding member 58, the third surface S3 and the fourth surface S4 are in contact with each other under a situation where the rotational speed of the flywheel 42 is the allowable upper limit speed. The sliding means may be provided in the vicinity of the input surface 42a side of the first surface S1 in the second cylindrical portion 42c so that the second surface S2 and the sliding means come into contact with each other. In this case, the sliding means may be a sliding member fixed to the second cylindrical portion 42c, or may be a portion formed integrally with the second cylindrical portion 42c.

  The one-way transmission mechanism is not limited to the one-way clutch 46, and may be another member as long as it has the same function.

  Further, the blocking member is not limited to the one-way transmission mechanism, and may be, for example, an electronically controlled clutch that switches the torque between the sun gear S and the input shaft 42a to either the transmission state or the cutoff state. . In this case, for example, a rotation speed sensor that detects the rotation speed of the flywheel 42 is provided, and if the control device 60 determines that the detected rotation speed is equal to or less than a specified speed, the control device 60 can switch the clutch to the disconnected state. That's fine.

  Furthermore, you may employ | adopt the structure which is not provided with the interruption | blocking member. Even in this case, the recovery efficiency of the kinetic energy of the vehicle when the regeneration control process is performed can be increased.

  In the first embodiment, the configuration in which the generator (second alternator 48) is connected to the input shaft 42a is adopted. However, the present invention is not limited to this, and a rotating machine having the function of a generator / motor may be connected. . In this case, for example, a battery 28 that has a certain upper limit of the energy that can be stored is used, and torque assist of the drive wheels 18 via the planetary gear mechanism 40 by driving a rotating machine that uses the battery 28 as a power supply source. And so on.

  The method for determining whether or not the in-vehicle main engine has been instructed to generate power is not limited to those exemplified in the above embodiments. For example, if it is determined that fuel cut control is being performed, it may be determined that no power generation instruction has been issued.

  The energy storage means is not limited to the flywheel 42 and may be other means as long as it has the same function.

  -As a vehicle to which this invention is applied, a vehicle provided with an internal combustion engine and a rotary machine as a vehicle-mounted main machine may be sufficient. Moreover, the vehicle provided only with a rotary machine as a vehicle-mounted main machine may be sufficient.

  DESCRIPTION OF SYMBOLS 10 ... Engine, 18 ... Drive wheel, 40 ... Planetary gear mechanism, 42 ... Flywheel, 42a ... Input shaft, 44 ... Torque adjustment device, 48 ... 2nd alternator, S ... Sun gear, C ... Carrier, R ... Ring gear.

Claims (4)

Applied to vehicles equipped with a main engine (10) as a driving power source,
Between the energy storage means (42) capable of storing the energy input through the input shaft (42a) as rotational energy, the torque adjusting means (44) capable of adjusting the torque acting on itself, and the drive wheel (18). The first rotating body (S), the second rotating body (C), and the third rotating body (coupled to the input shaft, the drive wheel, and the torque adjusting means, respectively, to enable power transmission. A planetary gear mechanism (40) having R);
A rotating machine (48) connected to the input shaft and generating electric power by being supplied with rotational energy stored in the energy storage means;
Regenerative processing means for performing regenerative control processing for storing kinetic energy of the vehicle in the energy storage means via the planetary gear mechanism and the input shaft under a situation where a power generation instruction for the main engine is not made;
With
The in-vehicle power transmission device, wherein the rotating machine is configured to have a characteristic that a current that can be output to the outside is not generated when the rotational speed of the input shaft is equal to or less than a specified speed.   The in-vehicle power transmission device according to claim 1, further comprising a blocking member (46) for blocking torque transmission from the input shaft to the first rotating body.   The blocking member connects the input shaft and the first rotating body only when the relative rotational speed on the first rotating body side with respect to the rotational speed on the input shaft side of the blocking member is not negative. The in-vehicle power transmission device according to claim 2, which is a one-way transmission mechanism (46) that transmits torque from the first rotating body to the input shaft.   The in-vehicle power transmission device according to any one of claims 1 to 3, wherein the energy storage means is a flywheel (42).

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