JP2017184506A - Dustproof construction of motor for hybrid power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid power unit using a bearing-less motor, capable of improving dustproof performance of a motor by arranging a dustproof labyrinth structure at a relative rotation part of the motor in proximity to the output side of an engine in the motor, thereby reducing a clearance in the labyrinth structure.SOLUTION: The hybrid power unit, using an engine and a motor 30 in combination, is of dustproof construction of the motor 30 whose rotating shaft 35 is cantilever-supported on a crankshaft 22 of the engine, which establishes a boundary between the motor 30 and the engine and includes an end plate 36 serving as an outer container of the motor 30. Part of a wall surface of the end plate 36 and part of a wall surface of a retaining ring 55 for a rotor 52 in a rotating shaft 35 of the motor 30 and a rotation sensor 50 fixed integrally with the rotating shaft 35 opposes to each other through a clearance and a labyrinth structure portion 60 is formed by bending midway through the clearance.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hybrid power unit that uses both an engine and a motor as a power source for vehicles such as forklifts and construction machines, and to a dustproof structure for the motor for the hybrid power unit.

  In vehicles such as forklifts, construction machines, etc., a hybrid power unit that uses an engine and a motor in combination as a power source has been developed as described above. In this hybrid power unit, the motor needs to have a dustproof structure. The most difficult part of maintaining the dustproof performance in the dustproof structure of the motor is the relative rotating part, which is the boundary between the fixed part and the rotating part, and a labyrinth (maze) structure is generally used here. (See Patent Document 1). In order to improve the dust resistance in the labyrinth structure, it is effective to reduce the gap between the opposing wall surfaces forming the maze.

JP-A-5-42833

  On the other hand, in the hybrid power unit, in order to shorten the overall axial length of the combination of the engine and the motor, a configuration in which the motor rotation shaft is cantilevered on the engine crankshaft and the motor is bearingless has been proposed. Yes. In the case of the hybrid power unit having this configuration, since the motor is a bearing-less structure, the rotation shaft of the motor may be misaligned due to manufacturing variations and the like. When misalignment occurs, the gap between the fixed part and the rotating part in the relative rotating part becomes non-uniform in the rotating direction, and if a labyrinth structure is provided there, the gap between the opposing wall surfaces forming the labyrinth is also not rotating in the rotating direction. It becomes uniform. Therefore, in consideration of the occurrence of misalignment of the rotating shaft, there is a limit to reducing the gap of the labyrinth structure in the relative rotating portion. Therefore, there is a problem that the dustproof performance cannot be sufficiently improved.

  In view of such a problem, an object of the present invention is to provide a clearance between the labyrinth structure in the hybrid power unit employing the bearingless motor by arranging the dust-proof labyrinth structure in the relative rotation portion of the motor close to the engine output side in the motor. Is to improve the dust-proof performance of the motor.

  The dust-proof structure of the hybrid power unit motor of the first invention is a dust-proof structure of the motor in which the rotating shaft is cantilevered on the crankshaft of the engine in a hybrid power unit that uses both the engine and the motor. The dust-proof structure forms an interface between the motor and the engine, and includes an end plate that is an outer container of the motor. Then, a part of the wall surface of the end plate and a part of the wall surface of the fixing member fixed integrally with the rotating shaft of the motor or the rotating shaft are opposed to each other through the gap and are bent in the middle of the gap to be labyrinth. The structure is formed.

  In the first invention, the labyrinth structure can be provided in each part around the rotating shaft of the motor. That is, each part can be selected from a position approaching the rotation center of the rotation shaft to a position separating from the position. When the labyrinth structure is provided at a position separated from the rotation center of the rotation shaft, a member that extends a part of the rotation shaft to a position separated from the rotation center is required. Note that the motor in this case also functions as a generator.

  In the case of a bearingless motor in which the rotation shaft of the motor is cantilevered by the crankshaft of the engine, the rotation shaft of the motor may cause misalignment due to manufacturing variations or the like. Here, the misalignment refers to a state in which the crankshaft axis and the motor rotation axis do not overlap on one straight line but are shifted. When the rotation axis of the motor is misaligned, the gap between the fixed part and the rotating part in the relative rotating part becomes non-uniform in the rotating direction, and if there is a labyrinth structure there, the opposing wall surfaces forming the labyrinth The gap is also non-uniform in the direction of rotation. For this reason, considering the misalignment of the rotating shaft, there is a limit to reducing the gap of the labyrinth structure in the relative rotating portion. Therefore, the dustproof performance cannot be sufficiently improved. According to the first invention, the labyrinth structure is provided between the end plate of the motor and the rotating shaft or the rotating shaft side member of the motor. That is, the labyrinth structure is provided on the crankshaft side of the engine in the motor. Therefore, compared to the case where the labyrinth structure is provided on the side away from the crankshaft, the labyrinth structure is less affected by the misalignment even if the rotation shaft of the motor is misaligned. As a result, the gap between the opposing wall surfaces in the labyrinth structure can be reduced, and the dustproof performance by the labyrinth structure can be enhanced.

  According to a second aspect of the present invention, in the dust-proof structure for the hybrid power unit motor according to the first aspect of the present invention, the fixing member is a rotor of a rotation sensor fixed to a rotation shaft of the motor. The labyrinth structure is constituted by a part of the wall surface of the end plate and a part of the wall surface of the rotor.

  In the second invention, the rotor of the rotation sensor includes the rotor itself or a fixing member for fixing the rotor to the rotation shaft, an adapter, and the like.

  According to the second invention, the labyrinth structure can be configured using the shape of the rotor of the rotation sensor. Therefore, formation of a labyrinth structure can be facilitated.

  According to a third aspect of the present invention, in the dust-proof structure for the hybrid power unit motor according to the second aspect, the labyrinth structure includes a part of the wall surface of the end plate, a part of the wall surface of the rotating shaft of the motor, and the wall surface of the rotor. And part of it.

  According to the third aspect, the labyrinth structure is formed between the end plate and the rotor of the rotation sensor, and between the end plate and the rotation shaft. Therefore, the shape of each of the end plate, the rotor, and the rotation shaft is not complicated, and the labyrinth structure by a combination thereof can be a complicated shape. As a result, the dustproof performance by the labyrinth structure can be enhanced.

It is sectional drawing which shows 1st Embodiment of this invention. It is an expanded sectional view of the principal part in the said 1st Embodiment. It is sectional drawing which shows 2nd Embodiment of this invention, and is an expanded sectional view corresponding to FIG. It is sectional drawing which shows 3rd Embodiment of this invention, and is an expanded sectional view corresponding to FIG. It is sectional drawing which shows 4th Embodiment of this invention. It is a schematic diagram which shows the concept of this invention. It is a schematic diagram explaining the effect | action of this invention.

  1 and 2 show a first embodiment of the present invention. 1st Embodiment shows the example which applied this invention to the hybrid power unit 10 as power sources, such as a forklift and a construction machine. The hybrid power unit 10 uses the engine 20 and the motor 30 together, and the motor 30 also functions as a generator. In each figure, each direction of the hybrid power unit 10 is indicated by an arrow. In the following description, the description regarding the direction is made based on this direction.

  In FIG. 1, the hybrid power unit 10 is described centering on the motor 30, the engine 20 is disposed in the X direction of the motor 30, and the oil pump 40 is disposed in the opposite X direction of the motor 30. The rotation shaft 35 of the motor 30 is coupled to the crankshaft 22 of the engine 20, and the rotation shaft 35 of the motor 30 is coupled to the pump shaft 42 of the oil pump 40 via the coupling member 44. The crankshaft 22 of the engine 20 is rotatably supported by a bearing 20a (see FIG. 6) provided on the cylinder block 21 of the engine 20. The pump shaft 42 of the oil pump 40 is rotatably supported by a bearing (not shown) provided on the pump body 41 of the oil pump 40. However, the motor 30 has a bearingless structure. Therefore, a hole 35a is formed in the X direction (engine 20 side) end surface of the rotating shaft 35 of the motor 30 so as to receive the counter X direction (motor 30 side) end 22a of the crankshaft 22 of the engine 20. ing. The motor-side end 22a of the crankshaft 22 is fitted and fixed in the hole 35a. In this case, the hole 35 a is formed by a part of the hole penetrating the entire rotating shaft 35. However, the hole 35a may be a bottomed hole having a size sufficient to receive the motor-side end 22a of the crankshaft 22.

  The motor 30 is a brushless motor, and a stator 32 is provided on the inner peripheral side of the housing 31, and a rotor 33 is provided on the outer peripheral side of the rotary shaft 35. The rotor 33 is located on the inner peripheral side of the stator 32, and when the current is supplied to the windings (not shown) of the stator 32, the rotor 33 is rotationally driven and functions as an electric motor. Further, when the rotor 33 is rotationally driven by the crankshaft 22 or the pump shaft 42, current is taken out from the winding of the stator 32 and functions as a generator.

  A partition wall 37 for closing the inside of the motor 30 is provided at the end of the motor 30 in the opposite direction to the X direction (oil pump 40 side). The partition wall 37 is formed in an annular shape along the outer shape of the motor 30, and the central portion of the partition wall 37 is closed by a coupling member 44. The partition wall 37 is fixed to the housing 31 of the motor 30, and the coupling member 44 is fixed to the end of the rotating shaft 35 of the motor 30 in the opposite direction to the X direction (oil pump 40 side). The inner peripheral side of the partition wall 37 and the outer peripheral side of the coupling member 44 are arranged close to each other so that relative rotation between the partition wall 37 and the coupling member 44 is possible. However, the motor 30 inner space and the oil pump 40 side space Air movement between the two is suppressed.

  The pump body 41 of the oil pump 40 is fixed to the outer peripheral portion of the housing 31 of the motor 30 with the partition wall 37 sandwiched between umbrella-shaped pump support members 43. The coupling member 44 is fixed to an end portion of the pump shaft 42 in the X direction (motor 30 side), and is fixed to an end portion of the rotation shaft 35 of the motor 30 in the opposite X direction (oil pump 40 side). The coupling member 44 is fixed to the rotating shaft 35 with bolts 45. Although only one bolt 45 is illustrated in FIG. 1, the fixing with the bolt 45 is performed at a plurality of locations along the annular shape of the end portion of the rotating shaft 35 in the anti-X direction (oil pump 40 side).

  In the X direction of the motor 30 (on the engine 20 side), an end plate 36 that forms a boundary between the motor 30 and the engine 20 and is an outer container of the motor 30 is provided. Therefore, the end plate 36 is integrally coupled to the outer peripheral side of the housing 31 of the motor 30. A stator 51 of the rotation sensor 50 is fixed to the wall surface of the end plate 36 in the anti-X direction (motor 30 side). A rotor 52 that forms the rotation sensor 50 together with the stator 51 is fixed at a position facing the stator 51 of the rotation sensor 50 on the rotation shaft 35 of the motor 30.

  A stator 51 of the rotation sensor 50 is formed by forming a core 51a having a structure in which thin electromagnetic steel plates are laminated into a circular ring shape as a whole, and winding portions 51b configured by winding a winding on the inner peripheral side thereof in a circumferential direction. A plurality are formed. The rotor 52 of the rotation sensor 50 is disposed on the inner peripheral side of the winding 51b of the stator 51 via a minute gap. Similar to the stator 51, the rotor 52 is formed in a circular ring shape, and a plurality of protrusions are formed on the outer peripheral side so as to face the winding portion 51b of the stator 51.

  Although not shown in the drawing, the winding portion 51b has two types of windings wound in layers. One is an excitation winding for exciting the iron core 51a of the winding portion 51b of the stator 51, and the other is a detection winding for detecting a change in magnetic flux density of the iron core 51a. When a current is passed through the exciting winding of the winding part 51b, the iron core 51a is excited. And when the rotor 52 is rotated by the rotating shaft 35 of the motor 30 and the protrusion moves in the circumferential direction on the inner peripheral side of the stator 51, the magnetic flux density of the iron core 51a of the winding part 51b is relative to the winding part 51b. It changes according to the change of the relative position of the protrusion. The change is detected as a voltage change by the detection winding of the winding part 51b.

  As shown in FIG. 2, the stator 51 of the rotation sensor 50 is fitted and fixed in a recess 36 d formed on the wall surface of the end plate 36 in the anti-X direction (motor 30 side). The recess 36d is formed to be recessed with a shape and size corresponding to the outer shape of the stator 51. A mounting plate 53 is in contact with the anti-X direction (motor 30 side) surface of the stator 51. The mounting plate 53 is formed in a shape and size corresponding to a portion of the iron core 51a of the stator 51 where the winding portion 51b is not provided. A through hole (not shown) is formed in the mounting plate 53 and the stator 51, and a nut 53a is welded and fixed to the mounting plate 53 at the position of the through hole.

  On the other hand, a bolt insertion hole 36 a that penetrates from the engine 20 side to the motor 30 side of the end plate 36 is formed in the end plate 36 corresponding to the through hole of the stator 51. Bolts 54 are respectively inserted into the bolt insertion holes 36 a, and these bolts 54 pass through the through holes of the stator 51 and are fastened to the nuts 53 a of the mounting plate 53.

  Specifically, the bolt 54 is inserted into the bolt insertion hole 36a from the engine 20 side with respect to the stator 51 and the mounting plate 53 fitted in the recess 36d of the end plate 36. At this time, the bolt 54 passes through the through hole of the stator 51 and is fastened to each nut 53 a of the mounting plate 53. In this way, the stator 51 is fixed to the end plate 36. The stator 51 is fixed to the center of the end plate 36 without being displaced in the radial direction by being fitted into the recess 36d. In FIG. 1, the description of the structure for fixing the stator 51 with the bolts 54 and the surrounding structure is omitted.

  On the other hand, a step portion 35b formed with a reduced shaft diameter is provided at the end of the rotation shaft 35 in the X direction (engine 20 side), and the inner peripheral side of the rotor 52 of the rotation sensor 50 is fitted into this step portion 35b. It is. A presser ring 55 is fixed by shrink fitting in the X direction (engine 20 side) of the rotor 52 of the stepped portion 35b. The presser ring 55 has a disk shape similar to that of the rotor 52, and the inner diameter after shrink fitting is the same as that of the rotor 52 and the outer diameter is made smaller. Thus, the rotor 52 fixed on the outer periphery of the rotating shaft 35 is positioned facing the inner peripheral side of the stator 51. On the outer peripheral side of the presser ring 55, a protrusion 55a that protrudes in the X direction (the engine 20 side) from the flat portion 55b on the inner peripheral side is formed. The presser ring 55 is shrink-fitted to the rotary shaft 35, but may be fixed by welding, screwing, or the like. Further, the presser ring 55 is not separated from the rotor 52 and may be integrated.

  The end plate 36 is penetrated by the rotation shaft 35 of the motor 30 on the center side. A labyrinth structure portion 60 is provided between the inner peripheral end of the end plate 36 and the outer peripheral end of the rotating shaft 35. In order to constitute the labyrinth structure portion 60, a recess 36 c is formed on the side surface of the motor 30 at the inner peripheral end of the end plate 36 so as to receive the protrusion 55 a of the presser ring 55. Therefore, the labyrinth structure 60 is constituted by the following gaps. In other words, the first gap is a gap formed by the protrusion 55 a of the presser ring 55 and the concave part 36 c of the end plate 36, and the second gap is the inner peripheral side end of the end plate 36 and the presser ring 55. The third gap is a gap formed by the inner peripheral side end portion of the end plate 36 and the stepped portion 35b of the rotating shaft 35. As described above, the labyrinth structure portion 60 is formed in the gap between the end plate 36 and the presser ring 55 and the gap between the end plate 36 and the rotating shaft 35, and the gap is formed by being bent halfway. ing.

  The motor 30 is assembled to the engine 20 by fixing the end plate 36 to a cylinder block (not shown) of the engine 20, coupling the rotating shaft 35 of the motor 30 to the crankshaft 22, and coupling the housing 31 to the end plate 36. Do it. At this time, the concavo-convex shape formed by the concave portion 36c of the end plate 36 and the protrusion 55a of the presser ring 55 constituting the labyrinth structure portion 60 is a shape that meshes with the X direction. Therefore, even if the motor 30 includes the labyrinth structure portion 60, the motor 30 can be assembled as in the case where the motor 30 is not provided.

  As described above, the labyrinth structure 60 is formed by the end plate 36 side member and the rotary shaft 35 side member. Therefore, in order to reduce the gap between the labyrinth structure portion 60 and enhance the dustproof effect, it is necessary to increase the positional accuracy of the end plate 36 and the rotating shaft 35. Therefore, when the end plate 36 is fixed to the cylinder block of the engine 20, the end plate 36 is attached to a positioning pin (not shown) provided so as to protrude toward the cylinder block so as to improve the fixing position accuracy between the two. A positioning hole (not shown) is fixed in a fitted state.

  FIG. 6 schematically shows an installed state of the labyrinth structure unit 60 in the first embodiment. Here, the crankshaft 22 of the engine 20 is pivotally supported by a pair of bearings 20a disposed at both ends in the X direction. On the other hand, the motor 30 has a bearingless structure, and the rotating shaft 35 of the rotor 33 is coupled to the crankshaft 22 and is cantilevered. The labyrinth structure portion 60 is formed in a gap between the end plate 36 integrated with the stator 32 of the motor 30 and the presser ring 55 which is a fixing member fixed integrally with the rotary shaft 35 of the motor 30. Has been.

  FIG. 7 shows the operation according to the first embodiment. As described above, when the motor 30 has a bearing-less structure, the rotor 33 and the rotating shaft 35 of the motor 30 may be misaligned due to manufacturing variation or the like. When the misalignment occurs, the shaft core 22b of the crankshaft 22 and the shaft core 35c of the rotating shaft 35 of the motor 30 do not overlap on one straight line, but are shifted. When the rotation shaft 35 of the motor 30 is misaligned as described above, the gap between the labyrinth structure portion 60 is not uniform in the rotation direction of the rotation shaft 35 due to the influence, and the gap between the labyrinth structure portion 60 is reduced. I can't. However, the degree of non-uniformity of the gap in the labyrinth structure portion 60 when the rotation shaft 35 of the motor 30 is misaligned is larger than that in the case where the labyrinth structure portion 60 is disposed on the non-engine side, as indicated by a virtual line. As shown by the solid line, the case where the labyrinth structure portion 60 is disposed on the engine side becomes smaller. In FIG. 7, the degree of misalignment is exaggerated for easy understanding.

  As described above, according to the first embodiment, since the labyrinth structure portion 60 is arranged on the engine side, even if the rotation shaft 35 of the motor 30 is misaligned, the gap of the labyrinth structure portion 60 is affected by the misalignment. It is considered difficult. As a result, the gap between the opposing wall surfaces in the labyrinth structure portion 60 can be reduced, and the dustproof performance by the labyrinth structure portion 60 can be enhanced.

  The labyrinth structure 60 is configured by using the shape of the presser ring 55 of the rotor 52 in the rotation sensor 50. Therefore, formation of the labyrinth structure part 60 can be facilitated. Further, the labyrinth structure portion 60 is formed between the end plate 36 and the pressing ring 55 and between the end plate 36 and the rotation shaft 35, respectively. Therefore, the shape of each of the end plate 36, the presser ring 55, and the rotating shaft 35 is not complicated, and the labyrinth structure by a combination thereof can be a complicated shape. As a result, the dustproof performance by the labyrinth structure can be enhanced.

  FIG. 3 shows a second embodiment of the present invention. In the first embodiment, the second embodiment is characterized in that the labyrinth structure portion 60 includes a gap where the end plate 36 and the pressing ring 55 face each other, and the end plate 36 and the rotation shaft. The second embodiment is configured such that the end plate 36 and the presser ring 55A are formed only in the gap facing each other. The other points are the same, and the description of the same part is omitted.

  In the case of the second embodiment, the inner peripheral side of the presser ring 55A is formed with a protrusion 55c protruding in the X direction (engine 20 side) from the outer peripheral flat portion 55b. On the other hand, a protrusion 36f that protrudes in the anti-X direction (motor 30 side) is formed on the inner peripheral side of the end plate 36 in the anti-X direction (motor 30 side) wall surface. And the step part formed in the inner peripheral side edge part of the protrusion 36f forms the labyrinth structure part 60 facing the step part formed of the flat part 55b and the protrusion part 55c of the pressing ring 55A. . As described above, the labyrinth structure portion 60 is formed in a gap between the inner peripheral side end portion of the end plate 36 and the outer peripheral side portion of the pressing ring 55A, and the gap is formed by being bent halfway.

  Also in the second embodiment, since the labyrinth structure portion 60 is configured using the end plate 36, even if the rotation shaft 35 of the motor 30 is misaligned, the gap of the labyrinth structure portion 60 is misaligned. It is considered to be in a state that is not easily affected by As a result, the gap between the opposing wall surfaces in the labyrinth structure portion 60 can be reduced, and the dustproof performance by the labyrinth structure portion 60 can be enhanced.

  FIG. 4 shows a third embodiment of the present invention. In the first embodiment, the third embodiment is characterized in that the labyrinth structure portion 60 includes a gap where the end plate 36 and the presser ring 55 face each other, and the end plate 36 and the rotation shaft. The third embodiment is configured such that the end plate 36 and the rotation shaft 35 are formed only in the gap facing each other, whereas the 35 is formed in the gap facing the 35. The other points are the same, and the description of the same part is omitted.

  In the case of the third embodiment, instead of the protrusion 55a and the flat portion 55b of the presser ring 55 in the first embodiment, a protrusion 35d and a recess 35e are formed on the outer peripheral side of the engine 20 side end of the rotating shaft 35. Yes. And the protrusion part 35d of the rotating shaft 35 is inserted in the recessed part 36c of the end plate 36 similar to the case of 1st Embodiment with the clearance gap. Further, the inner peripheral end of the end plate 36 is inserted into the recess 35e of the rotating shaft 35 through a gap. In this way, the labyrinth structure portion 60 has a gap between the opposite X-direction (motor 30 side) wall surface of the inner peripheral end of the end plate 36 and the X-direction (engine 20 side) end surface of the outer peripheral side of the rotating shaft 35. The gap is bent and formed in the middle.

  Also in the third embodiment, since the labyrinth structure portion 60 is configured using the end plate 36, even if the rotation shaft 35 of the motor 30 is misaligned, the gap of the labyrinth structure portion 60 is misaligned. It is considered to be in a state that is not easily affected by As a result, the gap between the opposing wall surfaces in the labyrinth structure portion 60 can be reduced, and the dustproof performance by the labyrinth structure portion 60 can be enhanced. In addition, the labyrinth structure 60 can be configured regardless of the rotation sensor 50.

  FIG. 5 shows a fourth embodiment of the present invention. A feature of the fourth embodiment with respect to the third embodiment (see FIG. 4) is that, in the third embodiment, the labyrinth structure portion 60 is configured on the side relatively close to the rotation center of the rotation shaft 35. On the other hand, the fourth embodiment is configured on the side relatively far from the rotation center of the rotation shaft 35. The other points are the same, and the description of the same part is omitted.

  In the case of the third embodiment, in the X direction (engine 20 side) on the outermost peripheral side of the rotary shaft 35, a flange portion 34 is formed that extends further in a bowl shape on the outer peripheral side and in the X direction (engine 20 side). Yes. The front end portion of the flange portion 34 faces the wall surface of the end plate 36 in the anti-X direction (motor 30 side). A recess 36e is formed on the wall surface of the end plate 36 in the anti-X direction (motor 30 side) so as to receive the tip of the flange 34 with a gap. And the labyrinth structure part 60 is comprised by the clearance gap between the front-end | tip part of the flange part 34, and the recessed part 36e of the end plate 36. As shown in FIG.

  Also in the fourth embodiment, since the labyrinth structure portion 60 is configured using the end plate 36, even if the rotation shaft 35 of the motor 30 is misaligned, the gap of the labyrinth structure portion 60 is misaligned. It is considered to be in a state that is not easily affected by As a result, the gap between the opposing wall surfaces in the labyrinth structure portion 60 can be reduced, and the dustproof performance by the labyrinth structure portion 60 can be enhanced.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, in each of the above embodiments, an oil pump is connected to the crankshaft of the engine and the rotating shaft of the motor, and the output of the hybrid power unit is converted to hydraulic pressure. However, the output of the hybrid power unit is directly used as power. It is good. In each of the above embodiments, the hybrid power unit is used as a power source for a forklift, a construction machine, and the like. However, the hybrid power unit may be used as a power source for a general vehicle such as a passenger car.

  Although the labyrinth structure part of each embodiment may be used independently, respectively, you may use it combining an appropriate embodiment. Thereby, the dustproof effect can be enhanced. Further, in order to enhance the dustproof effect, the number of repetitions of unevenness in the uneven shape forming the labyrinth structure portion can be increased.

DESCRIPTION OF SYMBOLS 10 Hybrid power unit 20 Engine 20a Bearing 21 Cylinder block 22 Crankshaft 22a Motor side end part 22b Shaft core 30 Motor 31 Housing 32 Stator 33 Rotor 34 Flange part 35 Rotary shaft 35a Hole 35b Step part 35c Shaft core 35d Projection part 35e Concave part 36 End plate 36a Bolt insertion hole 36c Recess 36d Recess 36e Recess 36f Projection 37 Bulkhead 40 Oil pump 41 Pump body 42 Pump shaft 43 Pump support member 44 Coupling member 45 Bolt 50 Rotation sensor 51 Stator 51a Iron 51b Winding section 52 Rotation Child 53 Mounting plate 53a Nut 54 Bolt 55, 55A Presser ring 55a Projection 55b Flat part 55c Projection 60 Labyrinth structure

Claims (3)

In a hybrid power unit that uses both an engine and a motor, the motor is dust-proofed and the rotating shaft is cantilevered by the crankshaft of the engine.
It forms the boundary between the motor and engine, and has an end plate that is the outer container of the motor.
A part of the wall surface of the end plate and a part of the wall surface of the fixing member fixed integrally with the rotating shaft of the motor or the rotating shaft are opposed to each other through a gap and bent in the middle of the gap to form a labyrinth structure. The dust-proof structure of the formed hybrid power unit motor. In claim 1,
The fixed member is a rotor of a rotation sensor fixed to a rotation shaft of a motor,
The labyrinth structure is a dust-proof structure of a motor for a hybrid power unit that is configured by a part of the wall surface of the end plate and a part of the wall surface of the rotor. In claim 2,
The labyrinth structure is a dust-proof structure for a motor for a hybrid power unit, which is constituted by a part of a wall surface of the end plate, a part of a wall surface of a rotating shaft of the motor, and a part of a wall surface of the rotor.

Images