JP2007002786A - Supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supercharger suppressing energy consumption and keeping a stop condition during non-operation of an electric motor. <P>SOLUTION: The supercharger of the invention combines an engine 1, the electric motor 12 and a super-charging compressor 9 with a planetary speed-increasing mechanism 20 for driving the super-charging compressor 9 and is provided with a lock mechanism 30 for mechanically locking the electric motor 12 during non-operation of the electric motor 12. The electric motor 12 does not require energization and the stop condition is kept during non-operation of the electric motor 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a supercharging device that supercharges intake air of an engine using an engine crank output and an electric motor as power sources.

  In automobiles (vehicles), as one method for increasing engine output, an engine is equipped with a supercharging device that supercharges engine intake air.

  In such a supercharger, the structure driven by the crank output of the engine, specifically, the rotation from the crank output is increased by a planetary speed increasing mechanism such as a planetary gear speed increasing mechanism or a planetary roller speed increasing mechanism. There is a device called a supercharger that drives an engine supercharging compressor. Recently, in order to compensate for the shortcomings of superchargers (insufficient supercharging at low engine speeds, etc.), a planetary speed increasing mechanism can be combined with an electric motor so that the compressor can be driven by the power of the electric motor. A supercharging device has been proposed.

  As described in Patent Document 1, many supercharging devices that use an electric motor are used as ring gears among rotating elements of a planetary gear speed increasing mechanism (a rotating element is a sun gear, a ring gear, or a planetary gear supported by a carrier). A structure in which an engine is connected, an electric motor is connected to the carrier, and a compressor for engine supercharging is connected to the sun gear is used, and the shaft output of the engine and the shaft output of both the engine and the electric motor are input. The required supercharging characteristics are ensured depending on the form.

  In such a supercharging device, when the operation of the electric motor is unnecessary (the supercharging of the electric motor is unnecessary), the operation of the electric motor is stopped (non-operation). However, simply turning off the power input to the electric motor and stopping the operation of the motor causes the electric motor to idle (rotate) due to the force acting on the carrier, thereby impairing supercharging.

Therefore, conventionally, a control for exciting the electric motor in the reverse direction is adopted, and by this control, a holding torque for holding the rotor of the electric motor in a fixed stop posture is generated, and the electric motor is stopped. (See Patent Document 1).
Japanese Utility Model Publication No. 7-35732

  By the way, the electric motor is stopped (non-actuated) frequently, including when the vehicle is idling (during high loads such as high-speed driving that does not require excessive supercharging by the electric motor, etc.). Even for generating a holding torque for a large-capacity product with a driving capacity, considerable power is required.

  For this reason, since the electric motor continues to consume power while it is stopped, the battery mounted on the automobile tends to be a considerable burden.

  Accordingly, an object of the present invention is to provide a supercharging device capable of holding a stopped state when an electric motor is not operated while suppressing energy consumption.

  In order to achieve the above object, the invention described in claim 1 employs locking means for mechanically locking the movement of the electric motor when the electric motor is not operating.

  According to the second aspect of the present invention, in addition to the above object, the second rotating element is accelerated as the third rotating element as the locking means so that the electric motor can be locked with a simpler structure. A one-way clutch that allows the electric motor to rotate when the rotational torque of the motor acts, and locks the shaft of the electric motor when the torque in the direction opposite to that direction acts is adopted.

  The invention described in claim 3 similarly employs an electromagnetic brake device that locks the shaft of the electric motor by magnetic absorption as the locking means.

  According to the first aspect of the present invention, when the electric motor is not operated, the electric motor does not need to be energized, and the stopped state is maintained.

  Therefore, it is not necessary to energize the electric motor to hold the electric motor in a stopped state, energy consumed by the electric motor can be reduced, and the burden on the battery mounted on the vehicle can be reduced.

  According to invention of Claim 2 and Claim 3, the stop state of an electric motor can be hold | maintained with a simple structure. Particularly, in the invention according to claim 2, the one-way clutch automatically locks the shaft of the electric motor in response to the torque acting on the second rotating element, so that a separate control system is unnecessary. The invention according to claim 3 has an advantage that the electric motor can be reliably locked at an appropriate time by the control of the electromagnetic brake device.

[First Embodiment]
Hereinafter, the present invention will be described based on a first embodiment shown in FIGS.

  FIG. 1 shows a supercharging device assembled in an engine. In FIG. 1, 1 is, for example, a reciprocating engine (hereinafter simply referred to as an engine), and 2 is a crank mounted on an end of a crankshaft 1a of the engine 1. Pulleys 3 indicate supercharging devices (superchargers), respectively. The supercharging device 3 is arranged, for example, on the side of the engine 1 in parallel with the engine 1. The detailed structure of the supercharging device 3 is shown in FIG. 2 and FIG. 3 (cross-sectional view taken along the line AA in FIG. 2).

  The structure of the supercharging device 3 will be described. In FIG. An input shaft 7 having a supercharging drive pulley 6 is rotatably mounted on the front portion of the casing 5 (the side on which the crank pulley 2 is provided). The pulley 6 is disposed in parallel with the crank pulley 2. An annular belt member 4 that is a rope member is wound between the pulley 6 and the crank pulley 2, and a shaft output (crank output) output from the crankshaft 1 a (engine 1) is transmitted to the pulley 6. It is like that. An output shaft 8 is disposed at the rear portion of the casing 5 (on the side opposite to the crank pulley 2), for example, with the axis of the input shaft 7 positioned on the extension line. The output shaft 8 passes through the rear wall of the casing 5. An engine supercharging compressor 9 (for example, a centrifugal type in this case) is assembled to the outer end of the output shaft 8 that has penetrated. In addition, 10 is a compressor wheel constituting the compressor 9, 11 is a spiral compressor cover that covers the wheel 19, 11 a is a suction port provided on the front surface of the cover 11, and 11 b is provided on the outer periphery of the cover 11. A discharge port (shown only in FIG. 1) is shown. Of these, the discharge port 11b of the compressor 9 is connected to the intake system of the engine 1 (not shown) so that the supercharged intake air can be sent to an intake port (not shown) of the engine 1.

  An electric motor 12 is installed inside the casing 5, for example, at a position near the rear, for example, in a posture facing the front-rear direction. The electric motor 12 is disposed, for example, in a cylindrical motor case 13 fixed to the casing 5 in the front-rear direction, an annular stator 14 attached to the inner peripheral surface of the motor case 13, and the stator 14. And a motor shaft 16 extending in the front-rear direction for supporting the rotor 15 (corresponding to the shaft of the present application), and a bearing 17 for rotatably supporting an end of the motor shaft 16. That is, the electric motor 12 has a structure in which when the stator 14 is excited through a cable (not shown), the rotor 15 rotates and a shaft output is output from the motor shaft 16.

  For example, a planetary gear speed increasing mechanism 20 is provided as a planetary speed increasing mechanism inside the casing 5, for example, between a point closer to the front portion, specifically between the front input shaft 7 and the output shaft 8. . For example, as shown in FIGS. 2 and 3, the planetary gear speed increasing mechanism 20 includes a sun gear 21 provided with a posture in which an axis is directed in the front-rear direction, and a ring gear 22 provided concentrically around the sun gear 21. And a plurality of planetary gears 23 interposed between the sun gear 21 and the ring gear 22 and a carrier 24 that rotatably supports each planetary gear 23. That is, the planetary gear speed increasing mechanism 15 is composed of a combination of three rotating elements (corresponding to the first to third rotating elements of the present application) such as a component 25 in which the sun gear 21, the ring gear 22, the planetary gear 23, and the carrier 24 are combined. Has been. The carrier 24 uses a ring-type gear having teeth 26 on the outer periphery.

  Of the rotating elements of the planetary gear speed increasing mechanism 15, the input shaft 7 is connected to the ring gear 22. That is, the ring gear 22 is driven by the shaft output of the engine 1. Reference numeral 7a denotes a bearing that rotatably supports the input shaft 7. A toothed portion 26 of the carrier 24 meshes with a pinion gear 27 attached to the end of the motor shaft 16. As a result, the carrier 24 (including the planetary gear 23) is driven by the shaft output output from the electric motor 12. The output shaft 8 is connected to the sun gear 21 through the carrier 24. By such a planetary gear mechanism having the ring gear 22 and the carrier 24 as the input side and the sun gear 21 as the output side, the rotation input from the ring gear 22 and the carrier 24 is accelerated by the meshing of each gear, and the sun gear 21 to the compressor 9. (Speed increasing mechanism).

  Of the power transmission path from the electric motor 12 to the carrier 24, for example, at the end of the motor shaft 16, for example, a one-way clutch 30 is provided as locking means. When the rotational torque in the direction to increase the speed of the sun gear 21 is applied to the carrier 24, the one-way clutch 30 is allowed to rotate the motor shaft 21 (electric motor 12), and conversely to the direction to increase the speed. When direction torque acts, a structure is used in which the motor shaft 21 (electric motor 12) is mechanically locked. For example, the one-way clutch 30 includes a heavy sleeve portion 33 formed by an inner sleeve 31 fixed to the motor shaft 16 and an outer sleeve 32 fixed to the casing 5 as shown in FIG. 4, and the inner sleeve 31 and the outer sleeve 31. A clutch unit is used which is combined with an intermittence portion 34 accommodated between the sleeve 32. Specifically, the intermittent portion 34 of the clutch unit includes a plurality of balls 35 (pieces) disposed in a gap between the inner sleeve 31 and the outer sleeve 32, and an inner sleeve inner surface (or outer shell) for releasing the balls 35. A ball type in which a hollow portion 36 formed on the sleeve inner surface) and a cage 37 and a spring 38 for positioning the ball 35 at a predetermined position are used. As the ball 35 of this clutch unit, a ball having a diameter larger than the gap between the inner sleeve 31 and the outer sleeve 32 is used. When a rotational torque in the speed increasing direction acts on the carrier 24, the ball 35 is applied to the recessed portion 36. When the inner sleeve 31 is allowed to rotate and reverse torque is applied, the ball 35 has a function of biting between the outer peripheral surface of the inner sleeve 31 and the inner peripheral surface of the outer sleeve 32 to lock the inner sleeve 31. . Due to the behavior of the ball 35, when a rotational torque in the direction to increase the speed is applied to the carrier 24, power is transmitted from the motor shaft 21 to the carrier 34, and when the opposite reverse torque is applied, the motor shaft 21 is locked. (The movement of the electric motor 12 is locked).

  The operation of the supercharging device 3 configured as described above will be described. It is assumed that supercharging is performed only by the output of the engine 1 (electric motor 12: non-operation).

  At this time, the shaft output output from the crank pulley 2 of the engine 1 is input to the ring gear 22 via the belt member 4, the pulley 6 and the input shaft 7. When this input rotation is transmitted to the sun gear 21 through the planetary gear 23, the rotation is accelerated. This rotation is output from the output shaft 8 to drive the compressor wheel 10 of the compressor 9 at a higher speed. As the compressor wheel 10 rotates, intake air is sucked from the intake port 11a. Then, the air is discharged from the discharge port 11 b while being compressed by centrifugal force, and is sent to an intake port (not shown) of the engine 1.

  During this power transmission, rotational torque in the direction opposite to the direction in which the speed is increased acts on the carrier 24. For this reason, this reverse rotational torque is transmitted to the one-way clutch 30 via the pinion gear 27 and the motor shaft 16.

  Then, the inner sleeve 31 of the one-way clutch 30 receives this reverse rotational torque, and is displaced in the locking direction, that is, the direction in which the ball 35 bites between the inner sleeve 31 and the outer sleeve 32, so that the inner sleeve 31 bites into the ball 35. To lock mechanically. Thereby, the motor shaft 16 is locked. That is, the movement of the electric motor 12 is mechanically locked. Thus, the stopped state of the electric motor 12 is maintained.

  On the other hand, it is assumed that the electric motor 12 is operated due to insufficient supercharging. The rotational torque generated by the electric motor 12 is a torque in a direction in which the carrier 24 is accelerated. This rotational torque is transmitted to the one-way clutch 30 via the motor shaft 16.

  Then, the inner sleeve 31 of the one-way clutch 30 receives this rotational torque and rotates in the free direction, that is, the direction in which the ball 35 falls into the recessed portion 36. As a result, the outer sleeve 32 is switched to a free state, and the shaft output of the electric motor 12 is transmitted to the carrier 24 via the motor shaft 16 and the pinion gear 27. Then, in the sun gear 21, the rotation that is accelerated by the shaft output of the engine 1 is added to the rotation that is accelerated by the shaft output of the electric motor 12, and the rotation of the compressor wheel 10 of the compressor 9 is further increased. As a result, the supercharging device 3 sends intake air having a supercharging pressure higher than the engine drive to an intake port (not shown) of the engine 1.

  As described above, the electric motor 12 is held (stopped) when the electric motor 12 is stopped (when the electric motor 12 is not operated) without being energized (generation of holding torque) by the mechanical lock. 12 can reduce the power consumed.

  Therefore, the burden on a vehicle-mounted battery (not shown) that is a power source of the electric motor 12 can be reduced. In particular, the stoppage of the electric motor 12 occurs in many driving states including when the vehicle is idling, so the effect is great.

  In addition, since the one-way clutch 30 automatically locks the motor shaft 16 of the electric motor 12 in response to the torque acting on the carrier 24, a separate control system is unnecessary and a simple structure is sufficient.

[Second Embodiment]
FIG. 5 shows a second embodiment of the present invention.

  In the present embodiment, an electromagnetic brake device, for example, an electromagnetic clutch device 40 is employed as a lock unit that holds the stopped state of the electric motor 12.

  Specifically, in the electromagnetic clutch device 40, for example, as shown in FIG. 5, an adsorption plate 42 formed of a magnetic member can be moved in the axial direction at the end of the motor shaft 16 via a spline portion 41. A structure in which a coil unit 44 in which an electromagnetic coil 43 for adsorption is installed is installed on the inner surface of the motor case 13 that is attached and faces the adsorption plate 42 is used. That is, when the electromagnetic coil 43 is excited when the electric motor 12 is stopped (not operating), the suction plate 42 is attracted to the coil unit 44 due to the magnetism of the electromagnetic coil 43, and the motor shaft 16 is locked due to the suction. It is made to do. In addition, the adsorption | suction plate 42 shown with the dashed-two dotted line in FIG. 5 has shown the state when the electromagnetic coil 43 is not excited, ie, the state separated from the coil unit 44. FIG.

  Even if it does in this way, the stop state of the electric motor 12 can be hold | maintained, reducing the electric power spent on the electric motor 12. FIG. In particular, in the case of the electromagnetic clutch device 40, the electric motor 12 can be reliably locked in accordance with an appropriate time by the control of the clutch device 40.

  However, in FIG. 5, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In addition, this invention is not limited to embodiment mentioned above, You may implement in various changes within the range which does not deviate from the main point of this invention. In the above-described embodiment, the example using the planetary gear speed increasing mechanism configured by a combination of gears as the planetary speed increasing mechanism has been described. However, the planetary speed increasing mechanism configured by a combination of rollers is not limited thereto. A mechanism may be used. Further, in the above-described embodiment, the structure in which the movement of the electric motor is locked when the electric motor is stopped by using a one-way clutch or an electromagnetic clutch device is described. Good. In the above-described embodiment, an example in which the engine is connected to the ring gear and the electric motor is connected to the carrier has been described. However, the speed increase is not limited to this, and the electric motor is connected to the ring gear and the input from the engine is connected to the carrier. A structure in which a shaft is connected may be used.

The figure which shows schematic structure of the supercharging apparatus which concerns on the 1st Embodiment of this invention with the engine which the apparatus attaches. Sectional drawing of the supercharger. Sectional drawing in alignment with the AA in FIG. Sectional drawing for demonstrating the structure of a one-way clutch. Sectional drawing of the supercharging device which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 3 ... Supercharging device, 4 ... Belt member, 7 ... Input shaft, 8 ... Output shaft, 9 ... Supercharging compressor, 12 ... Electric motor, 14 ... Stator, 15 ... Rotor, 16 ... Motor shaft ( Shaft), 20 ... Planetary gear speed increasing mechanism (planetary speed increasing mechanism), 21 ... Sun gear (third rotating element), 22 ... Ring gear (first rotating element), 23 ... Planetary gear, 24 ... Carrier (second) Rotating element), 30 ... one-way clutch, 40 ... electromagnetic clutch device (electromagnetic brake device).

Claims (3)

A planetary speed increasing mechanism having a first rotating element driven by an engine drive shaft, a second rotating element driven by an electric motor, and a third rotating element driving an engine supercharging compressor; ,
A supercharging device comprising: locking means for mechanically locking the movement of the electric motor when the electric motor is not operated.   The locking means allows the electric motor to rotate when a rotational torque acting in a direction to accelerate the third rotating element acts on the second rotating element, and a torque in a direction opposite to the direction acts. The supercharging device according to claim 1, wherein the supercharging device is a one-way clutch that locks the shaft of the electric motor.   The supercharging device according to claim 1, wherein the lock means is an electromagnetic brake device that locks a shaft of the electric motor by magnetic absorption.

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