JP4413207B2 - Generator motor - Google Patents

Description

  The present invention relates to a generator motor mounted on a work vehicle, and more particularly to a generator motor mounted on a hybrid type work vehicle.

  Conventionally, hybrid vehicles using both an engine and a generator motor (also referred to as a motor generator) have been used. The generator motor generates electric power when the hybrid vehicle is driven by an engine, and functions as a motor when the hybrid vehicle is driven by a motor. Alternatively, when the output torque of the engine is larger than the driving torque of the generator motor, the generator motor acts as a generator to generate electric power. When the output torque of the engine is smaller than the driving torque of the generator motor, the generator motor acts as a motor to assist the engine.

  For this reason, heat is generated in the generator motor, and if the heat generation in the generator motor is not suppressed, the generator motor may break down. For this reason, it is necessary to cool the generator motor.

  As a cooling device for the generator motor, a motor generator cooling device (see Patent Document 1) that constitutes a cooling circuit dedicated to the generator motor has been proposed. In addition, a hybrid type vehicle (see Patent Document 2) is proposed in which oil that has cooled a generator motor is used as engine preheating means by using the temperature of oil that has cooled a motor.

FIG. 4 shows a side view of the cooling device described in Patent Document 1 as Conventional Example 1 of the present invention. As shown in FIG. 4, the cooling device is configured to suck oil accumulated in the oil pan 52 in the motor generator 50 with the breather 51 by an engine drive type oil pump 53 through an oil passage 57.
The oil discharged from the oil pump 53 is supplied to the motor generator 50 via the oil passage 56 to cool the motor generator 50. An oil filter 54 and an oil cooler 55 for cooling the oil that cools the motor generator 50 after being filtered are disposed in the middle of the oil passage 56.

  The hybrid type vehicle described in Patent Document 2 is shown as Conventional Example 2 of the present invention, and FIG. 5 shows a residual heat circuit diagram of the engine in the hybrid type vehicle. As shown in FIG. 5, the hybrid vehicle (not shown) has an engine 60 and a motor 61, and an engine drive mode using only the engine 60 as a drive source and a motor drive mode using only the motor 61 as a drive source. And can drive in at least two modes. In Patent Document 2, the motor 61 corresponds to the generator motor described above.

  In the engine residual heat circuit, engine lubricating means for supplying and lubricating engine oil 64 to engine 60, engine cooling means for supplying and cooling cooling water to engine 60, and motor 61 Motor cooling means for supplying and cooling oil is configured.

  Further, engine preheating means is provided, and oil after cooling the motor 61 can be supplied to at least one of the engine lubrication means and the engine cooling means by switching the switching valve 62. Thereby, at least one of the engine oil 64 and the cooling water at the time of starting the engine can be heated, and the engine 60 can be easily started by warming the engine 60.

When the temperature of the oil after cooling the motor 61 is lower than the temperature of the engine oil 64 and the cooling water, the switching valve 62 is switched to stop the supply to the engine lubricating means and the engine cooling means. The oil after cooling the motor 61 has a circuit configuration in which the oil is directly cooled by the oil cooler 63.
Japanese Patent Laid-Open No. 2002-135907 JP-A-6-54409

  In the generator motor, heat generation in the coil portion is higher than heat generation in other parts. In particular, since high heat generation occurs in the coil portion of the generator motor, there is a problem that the coil portion is burned out due to heat. For this reason, if a coil part is cooled, the cooling effect with respect to a generator motor will also increase. However, the cooling device described in Patent Document 1 and the residual heat circuit described in Patent Document 2 do not disclose which part is cooled with respect to the motor generator 50 and the motor 61. .

In addition, there is no disclosure or suggestion of a configuration for cooling the coil portions of the motor generator 50 and the motor 61, which are desirably cooled preferentially.
Moreover, in patent document 1 and patent document 2, in order to cool the motor generator 50 and the motor 61, the exclusive cooling circuit is comprised, respectively. For this reason, it is necessary to provide the dedicated cooling circuit with an oil pump for circulating the cooling oil, an oil cooler for cooling the oil, and the like. Therefore, a space for installing an oil pump, an oil cooler, etc. is required.

  Moreover, in order to prevent the deterioration of the oil circulating in the dedicated cooling circuit, it is necessary to periodically replace the oil. If the time for replacing the oil circulating in the dedicated cooling circuit is different from the time for periodically replacing the oil used for engine lubrication, replace the oil at a different time. It must be made. In this case, it is necessary to stop the work of the work vehicle in order to change the oil circulating in the dedicated cooling circuit.

  Even when the oil used for engine lubrication is periodically replaced, and the oil circulating in the dedicated cooling circuit is replaced, the engine lubrication circuit and the dedicated cooling circuit The replacement work must be performed separately, and it takes time for the replacement work.

  An object of the present invention is to solve these problems that occur when cooling a conventional generator motor and to provide a generator motor that can increase the cooling efficiency of the coil portion of the generator motor.

The object of the present invention can be achieved by the inventions described in claims 1 to 6.
That is, in the generator motor mounted in the work vehicle and capable of selectively rotating the rotor by the engine drive and its own motor drive, the first invention of the present application is formed on one side surface of the rotor, The main feature is that it comprises a concentric recess, a communication hole that communicates the other side of the rotor and the inner peripheral surface of the recess, and a nozzle that supplies oil to the inner peripheral surface of the recess. It has a special feature.

The main feature of the second invention of the present application is that the configuration of the communication hole is specified.
In the third invention of the present application, the main feature is that the collision portion in the recess where the oil supplied from the nozzle collides is specified.

In the fourth invention of the present application, the main feature is that the configuration for cooling the generator motor by using the engine oil is specified.
In the fifth invention of the present application, the main feature is that the flow path configuration of the engine oil is specified.
The main feature of the present invention 6 is that the arrangement of the generator motor is specified.

  In the present invention, in a generator motor having a function as a generator and a function as a motor, a rotor having a recess concentric with the rotating shaft of the generator motor is used, and cooling oil is provided on the inner peripheral surface side in the recess. Supply. Thereby, the supplied oil can be moved along the rotating rotor wall surface and moved by the centrifugal force in the outer circumferential direction of the rotor. The oil that has moved in the outer peripheral direction is crushed and scattered, and can fall on the coil portion disposed on the outer peripheral portion of the rotor. With this configuration, the coil portion can be uniformly cooled, and the cooling efficiency for the coil portion can be increased.

  Further, since the inner peripheral surface side of the concave portion formed on one side surface of the rotor and the other side surface of the rotor are communicated with each other through the communication hole, the oil accumulated on the inner peripheral surface side of the concave portion via the communication hole It can also be discharged to the side. The oil discharged to the other side moves while being scattered in the outer peripheral direction of the rotor as the rotor rotates, so that the coil portion can be evenly cooled.

  Since the scattered oil adheres to the inner wall surface of the generator motor and the like, the housing of the generator motor can be cooled. Further, by combining the cooling oil with the engine lubricating oil, the engine lubricating pump, oil cooler, and the like can be used as they are.

  In this case, it is not necessary to provide a dedicated pump, oil cooler, or the like, so that the space in the work vehicle can be effectively used. In addition, since the engine lubricating oil is periodically replaced, the oil for cooling the generator motor is also automatically replaced, and high cooling efficiency can be maintained over a long period of time.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. As the configuration of the generator motor of the present invention, in addition to the shape and arrangement described below, the shape and arrangement can be adopted as long as the configuration and arrangement can solve the problems of the present invention. It can be done. For this reason, this invention is not limited to the Example demonstrated below, A various change is possible.

  FIG. 1 is a perspective view having a partially broken portion of a generator motor according to an embodiment of the present invention. FIG. 2 is a sectional view of the generator motor, and FIG. 3 is a supply circuit diagram of engine lubricating oil and generator motor cooling oil.

  1 shows a configuration in which the generator motor 2 is housed in the flywheel housing 3 of the engine 1, the generator motor is configured as a separate type from the engine 1, and the generator motor is driven by the engine 1 driving. An arrangement in which the rotor rotates can also be adopted.

  As shown in FIGS. 1 and 2, the generator motor 2 is disposed in the flywheel housing 3 of the engine 1. The flywheel housing 3 also serves as a housing for the generator motor 2. A crankshaft 5 for taking out the rotation of the engine 1 is provided in the flywheel housing 3 so as to protrude, and the flywheel 4 is fixed to the tip of the crankshaft 5.

  The flywheel housing 3 includes a body portion 3a that covers the outer peripheral portion of the flywheel 4 and the outer peripheral portion of the generator motor 2, and a lid portion 3b that covers the end face side of the generator motor 2. In FIG. 1, the lid 3b is not shown. A plurality of stators 7 are provided on the inner peripheral surface of the body portion 3a so as to protrude in the inner diameter direction. In addition, a coil portion 8 is wound around each stator 7.

  When the generator motor 2 acts as a generator, the rotor 6 is rotated by the crankshaft 5, and an alternating voltage is generated in the coil portion 8 by the relative rotation between the rotor core 6c and the coil portion 8. . The generated AC voltage is converted into a DC voltage by an inverter (not shown) and charged in a capacitor (not shown). Further, when the generator motor 2 is acting as a motor, the DC voltage stored in the capacitor is converted into an AC voltage by an inverter, and the coil unit 8 is excited by the converted AC voltage, whereby the rotor 6 is It will be rotationally driven.

  As shown in FIG. 1, teeth are formed on the outer peripheral surface of the flywheel 4 disposed in the flywheel housing 3. Through a sensor hole 18 formed in the flywheel housing 3, a rotation sensor (not shown) detects the movement of the teeth. That is, the rotation number of the flywheel 4 can be detected by the rotation sensor.

  A rotor 6 arranged coaxially with the crankshaft 5 is attached to the flywheel 4 via bolts 21. A gap having a constant interval is formed between the rotor core 6c formed on the outer peripheral portion of the rotor 6 and each stator 7 and coil portion 8.

  As shown in FIG. 2, the rotor 6 is provided with a shaft portion 5 a that is exposed from an opening (not shown) formed in the lid portion 3 b of the flywheel housing 3. A spline hole 5b for connecting an output shaft (not shown) is formed at the tip of the shaft portion 5a.

  When the output torque of the engine 1 is larger than the drive torque of the generator motor 2, the generator motor 2 acts as a generator to generate electric power, and the drive torque of the engine 1 is output from an output shaft (not shown). When the output torque of the engine 1 is smaller than the drive torque of the generator motor 2, the generator motor 2 acts as a motor and the drive torque that assists the engine 1 is output from the output shaft (not shown) together with the drive torque of the engine 1. Is done.

  An X ring or O ring as a seal member (not shown) is interposed in a gap between the outer peripheral surface of the shaft portion 5a and the opening of the lid portion 3b. The seal member prevents dust from entering the flywheel housing 3, and prevents cooling oil, which will be described later, from flowing out to the outside.

  As shown in FIGS. 1 and 2, a concave portion 10 concentric with the rotating shaft of the crankshaft 5 is formed on one side surface 6 a of the rotor 6. The concave portion 10 has a shape having a bottom surface portion 10a and an inner peripheral surface 10b. A plurality of communication holes 12 are formed so as to penetrate between the inner peripheral surface 10b side of the bottom surface portion and the other side surface 6b of the rotor 6.

  In the illustrated example, the communication hole 12 is formed in parallel with the rotation axis of the crankshaft 5, but the communication hole 12 is formed so as to have a twisted positional relationship with the rotation shaft of the crankshaft 5. Alternatively, it may be formed in a direction intersecting with the rotation axis of the crankshaft 5. With these configurations, the oil accumulated on the inner peripheral surface 10b of the recess 10 can be discharged to the other side surface 6b of the rotor 6 through the communication hole 12.

  In the body portion 3 a of the flywheel housing 3, a flow path 15 is formed through which cooling oil supplied to the recess 10 of the rotor 6 flows. One end of the flow path 15 is connected to a flow path for supplying lubricating oil to the engine 1. That is, one end of the flow path 15 is connected to a gallery port of a main gallery described later.

  The other end of the flow path 15 is connected to a pipe line 16 disposed outside the lid part 3b, and the pipe line 16 is connected to the nozzle 11 penetrating the lid part 3b and directed into the recess 10 of the rotor 6. is doing. Although the configuration in which the pipe line 16 is disposed outside the lid part 3b has been described, it is also possible to form a flow path having the same function as the pipe line 16 in the lid part 3b, or to connect the pipe line 16 to the lid part 3b. It can also be set as the structure arrange | positioned in the inner peripheral surface side.

  As the direction of the tip of the nozzle 11, when the rotor 6 is rotated, the oil injected from the nozzle 11 to the upstream side in the rotation direction of the rotor 6 with respect to the position at the lowest end of the recess 10 shown in FIG. It is desirable to set the direction of the tip of the nozzle 11 so as to collide.

  Although the direction of the tip of the nozzle 11 is described as the upstream portion in the rotation direction of the rotor 6, the portion where the oil injected from the nozzle 11 collides is too far from the lowest end of the recess 10 shown in FIG. It is desirable to keep it in such a way that it does not exist. In addition, the portion where the oil injected from the nozzle 11 collides can be a portion on the bottom surface portion 10a of the recess 10, a portion on the inner peripheral surface 10b, or a portion on the boundary between the bottom surface portion 10a and the inner peripheral surface 10b. .

  The oil injected from the nozzle 11 adheres to the side surface of the rotor 6 when colliding with the inner peripheral surface 10b side of the bottom surface portion 10a of the concave portion 10 as shown in FIG. As shown in FIG. 2, it receives a radial force and flows along one side surface 6 a of the rotor 6, and can be poured onto the coil portion 8 disposed on the outer peripheral side of the rotor 6.

  Further, even if the oil colliding with the bottom surface portion 10a of the concave portion 10 is accumulated at the inner peripheral surface 10b, the oil accumulated at the inner peripheral surface 10b is caused to remain on the other side surface 6b of the rotor 6 by the communication hole 12. Can be discharged to the side. In addition, the oil discharged to the other side surface 6b side is scattered in the radial direction as the rotor 6 rotates. Even with the scattered oil, it is possible to cool the coil part 8 by pouring into the coil part 8 together with the oil scattered on the one side surface 6a side of the rotor 6.

  Since the oil scattered on the one side surface 6a side and the other side surface 6b side of the rotor 6 can also adhere to the inner surface in the flywheel housing 3, the flywheel housing 3 can be cooled by the adhered oil. it can. In addition, since the rotor 6 rotates in the atmosphere of scattered oil, the heat generation of the rotor 6 portion can also be suppressed by the scattered oil.

  The oil that has become large particles by adhering to the coil portion 8 or the inner surface of the flywheel housing 3 can fall to the lower end side of the flywheel housing 3. The oil that has fallen and accumulated on the lower end side of the flywheel housing 3 can be discharged from a discharge port 20 formed in the lower portion of the flywheel housing 3 to a tank (not shown).

  A configuration in which the oil for lubricating the engine 1 and the oil for cooling the generator motor 2 are shared will be described with reference to the supply circuit diagram of FIG. As shown in FIG. 3, the oil in the tank 33 is sucked by the oil pump 23 and cooled by the oil cooler 25. In order to keep the hydraulic pressure supplied from the oil pump 23 to the oil cooler 25 below a certain pressure, a relief valve 24 is disposed between the oil pump 23 and the oil cooler 25.

The oil cooled by the oil cooler 25 removes impurities by the oil filter 27 and is supplied from the main gallery 28 and the piston cooling gallery 31 to the bearing portion 29, the generator motor 2 and the piston cooling portion 32. The bearing portion 29 includes the bearing portion of the engine 1 and the like. In addition, a relief valve 26 is disposed between the oil cooler 25 and the oil filter 27 in order to keep the hydraulic pressure supplied to the oil filter 27 below a certain pressure.
Although an example in which the oil filter 27 is disposed on the downstream side of the oil cooler 25 is shown, a configuration in which the oil filter 27 is disposed on the upstream side of the oil cooler 25 may be employed.

  Thus, the generator motor 2 can be cooled, in particular, the coil portion 8 can be cooled using the lubricating oil supplied to the engine 1 and the like. Therefore, the existing oil pump 23, oil cooler 25, and oil filter 27 that supply lubricating oil for the engine 1 and the like can be used. Therefore, it is not necessary to configure a dedicated cooling circuit for cooling the generator motor 2, and accordingly, a dedicated oil pump, oil filter, etc. for cooling the generator motor 2 are not required.

  In addition, since the existing circuit can be used effectively, the circuit configuration for cooling the generator motor 2 can be made compact. Moreover, by periodically replacing the lubricating oil for the engine 1 and the like, the oil for cooling the generator motor 2 is also automatically replaced, and the cooling efficiency for the generator motor 2 is maintained in a high state. be able to.

  The present invention can apply the technical idea of the present invention to an apparatus or the like to which the technical idea of the present invention can be applied.

It is a perspective view containing the partially broken part of a generator motor. (Example) It is sectional drawing of a generator motor. (Example) It is a supply circuit diagram of cooling oil. (Example) It is a side view of a cooling device. (Conventional example 1) It is an engine residual heat circuit diagram. (Conventional example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Generator motor, 3 ... Flywheel housing, 4 ... Flywheel, 5 ... Crankshaft, 6 ... Rotor, 7 ... Stator, 8 ... -Coil part, 10 ... recess, 11 ... nozzle, 12 ... communication hole, 23 ... oil pump, 25 ... oil cooler, 27 ... oil filter, 28 ... main gallery , 29 ... Bearing part, 31 ... Piston cooling gallery, 32 ... Piston cooling part, 50 ... Motor generator, 53 ... Oil pump, 54 ... Oil filter, 55 ... Oil cooler, 60 ... engine, 61 ... motor, 62 ... switching valve, 63 ... oil cooler.

Claims (6)

In a generator motor mounted in a working vehicle and capable of selectively rotating a rotor by engine driving and own motor driving,
A recess formed on one side of the rotor, concentric with the rotating shaft of the generator motor;
A communication hole communicating the other side surface of the rotor and the inner peripheral surface side of the recess;
A nozzle for supplying oil to the inner peripheral surface side of the recess;
A generator motor comprising:   The generator motor according to claim 1, wherein the communication hole is formed in parallel with the rotation shaft.   When one side surface of the rotor is in the vertical direction, the collision portion of the oil supplied from the nozzle in the recess is nearer to the upstream side in the rotation direction of the rotor than the lowest end position of the recess. The generator motor according to claim 1 or 2.   The generator motor according to claim 1, wherein the oil is also used as engine oil.   The generator motor according to claim 4, wherein a flow path branched from a flow path for supplying engine oil to the engine is connected to the nozzle. The generator motor according to claim 1, wherein the generator motor is provided in a flywheel housing of the engine.

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