JP2010060026A - Lubricating structure, motor unit, and in-wheel motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently scoop up the lubricating oil, while restricting a friction loss due to scoop up of the lubricating oil. <P>SOLUTION: A scoop-up ring 50 having scoop-up teeth 56 respectively formed hollow inside thereof and respectively formed with a communication opening 58 capable of leading the lubricating oil into the inside and an opening 56c capable of discharging the lubricating oil, which flows into the inside through the communication opening 58, is fitted to the inner peripheral surface of a rotor 24 by pressing. When the rotor 24 is rotated, the scoop-up teeth 56 scoop up the lubricating oil, while storing the lubricating oil inside thereof. As a result, a quantity of the lubricating oil more than before can be scooped up. Further, with the structure that just the scoop-up tooth 56 is formed hollow, the lubricating oil can be efficiently scooped up, while restricting an increase of friction when scooping up the lubricating oil. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lubrication structure, an electric motor unit, and an in-wheel motor. More specifically, the present invention includes a scraping member that can scrape up the lubricating oil as the rotating shaft rotates, and the lubricating oil scraped up by the scraping member An electric motor unit as a power mechanism including a lubrication structure that directly or indirectly lubricates at least a part of each part of the power mechanism, a rotor shaft as a rotating shaft, and an electric motor having a rotor that rotates integrally with the rotor shaft, and this The present invention relates to an in-wheel motor that drives a drive wheel by arranging an electric motor unit in a wheel.

Conventionally, as this type of lubrication structure, the scraping ring is rotated along with the rotation of the drive unit's rotating shaft to scrape the lubricant in the drive unit and supply the scraped lubricant to the lubrication required part. Have been proposed (see, for example, Patent Document 1).
In this lubricating structure, it is assumed that the lubricating oil can be efficiently scraped by providing a blade-shaped scraping member on the scraping ring.
JP 2005-8143 A

  However, in such a lubrication structure, it is necessary to provide a large number of scraping members when scraping a large amount of lubricant, and friction loss due to the scraping of the lubricant becomes large.

  The lubrication structure, the electric motor unit, and the in-wheel motor according to the present invention have an object of efficiently scavenging the lubricating oil while suppressing friction loss due to the scooping up of the lubricating oil. In addition, the lubrication structure, the electric motor unit, and the in-wheel motor according to the present invention are intended to improve lubrication performance.

  The lubrication structure, electric motor unit, and in-wheel motor of the present invention employ the following means in order to achieve at least a part of the above-described object.

  The lubricating structure of the present invention includes a scraping member that can scrape up the lubricating oil as the rotating shaft rotates, and each part of the power mechanism is directly or indirectly used by using the lubricating oil scraped up by the scraping member. The scraping member has a scraping part that scrapes at least the lubricating oil formed in a hollow shape, and the lubricating oil enters the scraping part that is formed in a hollow shape. The gist is that an introduction opening into which can be introduced is formed.

In the lubrication structure of the present invention, the scraping part of the scraping member that scoops up the lubricating oil is formed in a hollow shape, and an introduction opening into which the lubricating oil can be introduced is formed in the scraping part formed in the hollow. When the oil is scraped up, the lubricating oil can be taken into the scraped portion. As a result, more lubricating oil can be scraped up. Further, since the scraping portion is simply formed hollow, the lubricating oil can be efficiently scraped while suppressing an increase in friction when the lubricating oil is scraped up. Of course, at least a part of each part of the power mechanism can be lubricated using the lubricating oil scooped up by the scooping part.

In such a lubricating structure of the present invention, the scraping portion may be formed in a hollow shape in a manner in which a surface facing the introduction opening is closed.
In this way, it is possible to prevent the lubricating oil taken into the scraped portion from the introduction opening from spilling from the surface facing the introduction opening. As a result, the lubricating oil can be scraped more efficiently.

In the lubricating structure of the present invention, the scraping portion may be formed in a tooth shape, and the introduction opening may be formed on a tooth side surface along the tooth trace direction.
If it carries out like this, when a scraping member rotates, lubricating oil can be taken in in a scraping part. As a result, the lubricating oil can be taken into the scraping portion more efficiently.

In the lubricating structure of the present invention in which the introduction opening is formed on the tooth side surface along the tooth trace direction of the scraping portion, the introduction opening is at least the front side of the tooth side surface that is the front side in the rotational direction of the scraping member. It can also be formed on the tooth side surface.
In this way, the lubricating oil can be introduced more efficiently in the scraping portion.

In the lubricating structure of the present invention of this aspect, the scraping member has a first scraping portion and a second scraping portion in the circumferential direction as the scraping portion, and the introduction opening includes the first scraping portion. The raising portion is formed on the front tooth side surface, and the second scraping portion is formed on the rear tooth side surface which is the rear side in the rotation direction of the scraping member among the tooth side surfaces. You can also.
If it carries out like this, lubricating oil can be introduce | transduced in a scraping part irrespective of the rotation direction of a scraping member.

In this aspect of the lubricating structure of the present invention, the scraping member may be formed by alternately forming the first scraping portion and the second scraping portion in the circumferential direction.
In this way, the equivalent lubricating oil can be taken into the scraping part regardless of the rotation direction of the scraping member.

In the lubricating structure of the present invention, the scraping portion may be formed with a lead-out portion that can lead out the lubricating oil introduced from the introduction opening.
If it carries out like this, the lubricating oil introduce | transduced in the scraping part can be derived | led-out.

In the lubricating structure of this aspect of the present invention, the lead-out portion may be formed closer to the facing surface facing the surface than the surface of the scraping portion where the introduction opening is formed. .
In this way, the lubricating oil introduced from the introduction opening is subjected to rotational force and moves to the opposite surface side facing the surface where the introduction opening is formed, so that the introduced lubricating oil can be easily derived.

In the lubricating structure of the present invention in which such a lead-out portion is formed, the lead-out portion is formed so that the amount of the lubricating oil led out is smaller than the amount of the lubricating oil introduced from the introduction opening. It can also be.
In this way, it is possible to reduce the amount of lubricating oil derived compared to the amount of lubricating oil introduced into the scraping portion. As a result, the lubricating oil can be retained in the scraping portion for a relatively long time.

In the lubricating structure of this aspect of the present invention, the lead-out portion may be formed in an opening having a smaller area than the introduction opening.
By so doing, it is possible to easily ensure a structure that reduces the amount of lubricant to be derived as compared with the amount of lubricant introduced into the scraping portion.

In the lubricating structure of the present invention in which the lead-out portion is formed in an opening having a smaller area than the introduction opening, the lead-out portion may be formed as a choke.
In this way, the amount of lubricating oil to be derived can be adjusted simply by changing the choke length.

The lubricating structure of the present invention may include a guide member that guides the direction in which the lubricating oil is led out from the leading portion.
If it carries out like this, the derived | led-out lubricating oil can be guided to the site | part which requires lubricating oil. As a result, the lubrication performance can be improved.

In this aspect of the lubricating structure of the present invention, the guide member may be formed in the vicinity of the lead-out portion.
In this way, the lubricating oil can be reliably guided in the supply direction.

  The electric motor unit of the present invention is an electric motor unit as the power mechanism including an electric motor having a rotor shaft as the rotating shaft and a rotor that rotates integrally with the rotor shaft, and the scraper is disposed on an inner peripheral surface of the rotor. The gist is to arrange a raising member and to lubricate at least a part of each part using the lubricating structure according to claim 1.

  In the electric motor unit of the present invention, a scraping member is arranged on the inner peripheral surface of the rotor, and at least a part of each part of the electric motor unit is lubricated using the lubricating structure of any of the above-described aspects. The effect similar to the effect which a lubrication structure show | plays, for example, the effect which can aim at the improvement effect of lubrication performance, the effect of scooping up lubricating oil efficiently, suppressing the increase in friction at the time of scooping up lubricating oil, etc. can be show | played. In addition, since the scraping member is merely disposed on the inner peripheral surface of the rotor, the axial length of the electric motor unit is not increased, and the size can be reduced.

In the electric motor unit of the present invention in which the scraping member is arranged on the inner peripheral surface of the rotor, the scraping member is a ring-shaped member having teeth in the circumferential direction as the scraping portion. It can also be formed by fitting to a surface.
In this case, the scraping member can be simplified because only the ring-shaped member having teeth in the circumferential direction is fitted to the inner peripheral surface of the rotor.

Further, in the electric motor unit of the present invention in which the scraping member is disposed on the inner peripheral surface of the rotor, the scraping member is used as a rotation speed detection tooth for the scraping unit to detect the rotation speed of the rotor. It can also be formed.
In this case, it is not necessary to provide a separate rotation speed detection tooth, and therefore the increase in the number of parts can be suppressed.

The electric motor unit of the present invention includes an electric motor case that houses the electric motor and forms a storage portion that stores the scraped lubricating oil together with other members, and the rotor shaft has a flow path for the lubricating oil. As a lubricating oil passage is formed at the center of the shaft, a through hole as a lubricating oil supply port is formed through the lubricating oil passage in a radial direction, and is supplied from the reservoir to the lubricating oil passage. Lubricating oil may be supplied to each part from the through hole by rotation.
In this way, it is possible to easily secure a circuit for supplying the lubricating oil to each part of the electric motor unit.

  An in-wheel motor according to the present invention is an in-wheel motor that drives a drive wheel by disposing the electric motor unit according to any one of claims 14 to 16 in the wheel, wherein the electric motor unit decelerates power from the electric motor. A planetary gear mechanism that outputs to the driving wheel, and the rotor shaft and the output shaft connected to the driving wheel are connected to two of the three rotating elements of the planetary gear mechanism, respectively. The gist of the invention is that another rotating element is non-rotatably supported by the case of the electric motor unit.

  Since the in-wheel motor of the present invention includes the above-described electric motor unit of the present invention, the same effect as the effect of the electric motor unit of the present invention can be achieved.

  Next, the best mode for carrying out the present invention will be described using examples.

FIG. 1 is a configuration diagram showing an outline of a configuration of an in-wheel motor 10 equipped with an electric motor unit 20 using a lubrication structure as one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line VV in FIG. It is sectional drawing shown.
As shown in FIG. 1, the in-wheel motor 10 of the embodiment includes an electric motor unit 20, a hub 4 attached to the output shaft 2 of the electric motor unit 20, and a wheel 6 fixed to the hub 4 with bolts B. And a tire (not shown) to be attached.

As shown in FIG. 1, the electric motor unit 20 according to the embodiment mainly includes an electric motor MG, an output shaft 2, and a planetary gear 60 that connects the rotor shaft 22 and the output shaft 2 of the electric motor MG. Is accommodated in the case 30.
The case 30 includes a first case 32 that accommodates the electric motor MG and the planetary gear 60, a second case 34 that rotatably supports the rotor shaft 22 via a bearing BRG1, and an output shaft 2 that is rotatable via a bearing BRG2. The third case 36 to be supported is coupled by a fastening part such as a bolt 38.
The case 30 is filled with lubricating oil for lubricating the electric motor MG, the planetary gear 60, the bearings BRG1, BRG2, and the like.

A cover member 40 for closing the opening 34a is coupled to the second case 34 by a bolt 42. By attaching the cover member 40 to the second case 34, as shown in FIG. 1 and FIG. An introduction port 44 through which lubricating oil can be introduced is formed together with the surface of the case 34, and an oil storage portion 46 that can store the introduced lubricating oil is formed.
In the second case 34, as shown in FIG. 2, guide walls 34b for guiding the scattered lubricating oil to the introduction port 44 are radially formed from the introduction port 44 to the outside.

  The electric motor MG is configured as a synchronous generator motor including a rotor shaft 22, a rotor 24 attached to the rotor shaft 22 with bolts 22a and having a permanent magnet attached thereto, and a stator 26 around which a three-phase coil is wound. On the inner peripheral surface of the rotor 24, a scraping ring 50 capable of scraping the lubricating oil filled in the case 30 is attached by press-fitting.

  The rotor shaft 22 of the electric motor MG has a hollow structure, and a lubricating oil passage 22b for lubricating oil is formed at the center of the shaft. In this lubricating oil path 22b, radial through holes 22c are formed at a plurality of locations as supply ports for supplying lubricating oil to each part of the electric motor unit 20, for example, the planetary gear 60 and the needle bearing NBRG. Lubricating oil is supplied from the oil reservoir 46 to the lubricating oil passage 22b using the oil channel OC.

3 is a perspective view showing a configuration of the scraping ring 50, FIG. 4 is an enlarged view showing the rotor 24 to which the scraping ring 50 is attached, and FIG. FIG. 6 is a front view of the attached rotor 24 as viewed from the front, and FIG. 6 is a cross-sectional view showing the XX cross section of FIG. 4.
As shown in FIG. 3, the scraping ring 50 is formed in a ring shape in which concave portions 52 and convex portions 54 are alternately formed. As shown in FIGS. 3, 4, and 5, the convex portions 54 are formed. The outermost peripheral surface is pressed into the inner peripheral surface of the rotor 24 to form a plurality of scraping teeth 56 in which the concave portion 52 forms a hollow portion. The hollow portion formed by the recess 52 is closed at one end in the longitudinal direction of the recess 52 by the flange portion 24 a of the rotor 24 when the scraping ring 50 is attached to the inner peripheral surface of the rotor 24. The other end in the longitudinal direction, which is the opposite side to the portion 24a, has a bag path shape that is opened as an opening 56c.

Of the tooth side surfaces along the tooth trace direction of the scraped teeth 56, the front tooth side surface 56a which is the front side with respect to the positive rotation direction of the rotor 24 (the arrow direction in FIGS. 3 to 5) is shown in FIGS. As described above, a communication opening 58 that communicates the inside and outside of the recess 52 as a hollow portion is formed. Here, the communication opening 58 is formed on the front tooth side surface 56a of all the scraping teeth 56 in the embodiment.
Further, among the tooth side surfaces along the tooth trace direction of the scraped teeth 56, the rear tooth side surface 56b which is the rear side with respect to the positive rotation direction of the rotor 24 protrudes in the direction opposite to the flange portion 24a from the opening 56c. A guide portion 59 is provided continuously and integrally. Here, the guide part 59 shall be formed with respect to all the raising teeth 56 in the Example. The guide portion 59 is set to face the introduction port 44 and the oil storage portion 46 when the scraping ring 50 is attached to the inner peripheral surface of the rotor 24.
The scraping teeth 56 of the scraping ring 50 are also used as detection teeth for detecting the rotational position of the rotor 24 by the rotational speed sensor 80 attached to the second case 34. Thereby, it is not necessary to separately provide detection teeth for detecting the rotational position, and an increase in the number of parts can be suppressed. Further, as shown in FIG. 1, since the rotation speed sensor 80 can be accommodated on the inner peripheral surface side of the rotor 24, the in-wheel motor 10 itself can be made compact.

  As shown in FIG. 1, planetary gear 60 meshes with sun gear 62 as an external gear, ring gear 64 as an internal gear disposed concentrically with sun gear 62, and meshes with ring gear 64. A planetary gear mechanism is provided that includes a plurality of pinion gears 66 and a carrier 68 that holds the plurality of pinion gears 66 so as to rotate and revolve. The sun gear 62, the ring gear 64, and the carrier 68 are used as rotating elements to perform a differential action. . In the planetary gear 60, the sun gear 60 is integrally formed with the rotor shaft 22, the carrier 66 is integrally formed with the output shaft 2, and the ring gear 62 is supported by the first case 32 so that its rotation is prohibited.

Next, the operation of the electric motor unit 20 configured as described above, particularly the operation when scooping up the lubricating oil accompanying the rotation of the rotor 24 will be described.
When the in-wheel motor 10 is operated and the electric motor MG of the electric motor unit 20 is driven, the rotor 24 is rotated accordingly. Thereby, the lubricating oil filled in the case 30 is scraped up by the scraping teeth 56 of the scraping ring 50 attached to the inner peripheral surface of the rotor 24. At this time, the scraping teeth 56 are formed hollow inside, and the communication opening 58 is formed in the front tooth side surface 56a which is the front side with respect to the forward rotation direction of the rotor 24. It flows into the hollow portion of the scraping teeth 56 through 58. Here, the rear tooth side surface which is the rear side with respect to the positive rotation direction of the rotor 24 is formed in a closed shape, so that the lubricating oil flowing from the communication opening 58 can be surely stored in the scooping teeth 56. it can.
In this manner, the scraping ring 50 scoops up the lubricating oil while accumulating the lubricating oil in the scraping teeth 56, so that a larger amount of lubricating oil can be scooped up. In addition, since the scraping teeth 56 are only formed hollow, the lubricant can be efficiently scraped while suppressing an increase in friction when the lubricant is scraped. Further, since the liquid level of the lubricating oil stored in the case 30 can be lowered by the amount of the lubricating oil stored in the scraping teeth 56, the stirring resistance of the electric motor MG can be reduced.

A part of the lubricating oil thus swung up by the scooping teeth 56 directly lubricates and cools each part of the electric motor unit 20 such as the electric motor MG and the planetary gear 60 by scattering, and the rest is directly or indicated by arrows in FIG. Then, the oil is introduced into the oil reservoir 46 from the introduction port 44 through the guide wall 34 of the second case 34, and the planetary gear 60 and the needle are connected via the oil channel OC, the lubricating oil passage 22b of the rotor shaft 22 and the radial through hole 22c. Lubrication and cooling of each part of the electric motor unit 20 such as the bearing NBRG are performed.
On the other hand, the lubricating oil accumulated in the scraping teeth 56 is discharged from the opening 56 c as the rotor 24 rotates and is guided toward the introduction port 44 by the guide portion 59. Then, each part of the electric motor unit 20 such as the planetary gear 60 and the needle bearing NBRG is introduced into the oil reservoir 46 from the introduction port 44 through the oil channel OC, the lubricating oil passage 22b of the rotor shaft 22 and the radial through hole 22c. Lubricate and cool.
Thus, since more lubricating oil can be scraped up and each part of the electric motor unit 20 can be lubricated and cooled, the lubrication performance can be improved. In addition, the lubricating oil discharged from the opening 56 c can be reliably guided to the introduction port 44 by the guide portion 59.

  According to the lubricating structure of the first embodiment described above, the scraping teeth 56 of the scraping ring 50 that scrapes the lubricating oil are formed hollow, so that the scraping is performed when the lubricating oil is scraped along with the rotation of the rotor 24. The lubricating oil can be scraped up while accumulating the lubricating oil in the raising teeth 56. As a result, more lubricating oil can be scraped up. In addition, since the scraping teeth 56 are only formed hollow, the lubricant can be efficiently scraped while suppressing an increase in friction when the lubricant is scraped. Further, since the liquid level of the lubricating oil stored in the case 30 can be lowered by the amount of the lubricating oil stored in the scraping teeth 56, the stirring resistance of the electric motor MG can be reduced.

  Further, according to the lubricating structure of the first embodiment, when the lubricating oil accumulated in the scraping teeth 56 is discharged from the opening portion 56c, it is guided in the direction of the introduction port 44 by the guide portion 59, so that the lubricating oil is effective. Thus, it can be introduced into the oil reservoir 46 and supplied to each part of the electric motor unit 20. As a result, the lubrication performance is improved. Moreover, since the guide portion 59 is formed in the vicinity of the opening 56c through which the lubricating oil is discharged, the lubricating oil can be reliably guided.

  Furthermore, according to the lubricating structure of the first embodiment, only the scraping ring 50 in which the concave portions 52 and the convex portions 54 are alternately formed is press-fitted into the inner peripheral surface of the rotor 24, so that more lubricating oil is scraped. The structure to be raised can be easily secured, and an increase in the axial length of the electric motor unit 20 can be suppressed to achieve a compact size.

  Further, according to the lubricating structure of the first embodiment, the scraping teeth 56 of the scraping ring 50 are also used as detection teeth for detecting the number of rotations of the rotor 24. Therefore, there is no need to separately provide the number of rotation detection teeth. The increase in points can be suppressed.

  In the lubricating structure of the first embodiment, the communication opening 58 is formed in the front tooth side surface 56a of the scraping tooth 56, but the communication opening 58 may not be formed. In this case, the opening 56 c is used as an inlet and an outlet for the lubricating oil to the scraping teeth 56.

  In the lubricating structure of the first embodiment, the guide portion 59 that guides the lubricating oil discharged from the opening portion 56c in the direction of the introduction port 44 is provided. However, the guide portion 59 may not be provided.

Next, the in-wheel motor 100 which mounts the electric motor unit 120 using the lubrication structure as 2nd Example of this invention is demonstrated.
The in-wheel motor 100 equipped with the electric motor unit 120 using the lubricating structure of the second embodiment is the first described with reference to FIGS. 1 and 2 except that the scraping ring 50 is changed to the scraping ring 150. It has the same configuration as the in-wheel motor 10 on which the electric motor unit 20 using the lubricating structure of the embodiment is mounted. Therefore, in the configuration of the in-wheel motor 100 of the second embodiment, the same reference numerals are given to the same configurations as those of the in-wheel motor 10 of the first embodiment, and illustration and detailed description thereof are omitted to avoid duplication. To do.

7 is an enlarged view showing the rotor 124 to which the scraping ring 150 is attached, and FIG. 8 is a front view of the rotor 124 to which the scraping ring 150 is attached as viewed from the front. These are sectional drawings which show the YY cross section of FIG.
The scraping ring 150 is formed in a ring shape in which concave portions 152 and convex portions 154 are alternately formed. As shown in FIGS. 7 and 8, the outermost peripheral surface of the convex portion 154 is the inner periphery of the rotor 124. By being press-fitted into the surface, a plurality of scraping teeth 156 in which the concave portion 152 forms a hollow portion are formed. The hollow portion formed by the recess 152 is closed at both ends in the longitudinal direction of the recess 152 when the scraping ring 150 is attached to the inner peripheral surface of the rotor 124.

Among the tooth side surfaces along the tooth trace direction of the scraped teeth 156, the front tooth side surface 156a, which is the front side with respect to the positive rotation direction of the rotor 124, has a recess 152 as a hollow portion inside and outside as shown in FIGS. A communication opening 158 that communicates with each other is formed. In addition, a blocking wall 156c formed on the opposite side of the flange portion 124a on both ends in the longitudinal direction of the recess 152 that closes the hollow portion by the recess 152 has an opening compared to the communication opening 158 as shown in the figure. An orifice 156d having a small area is formed. Here, the communication opening 158 is formed in the front tooth side surface 156a of all the lifting teeth 156 in the embodiment, and the orifice 156d is formed in the blocking wall 156c of all the lifting teeth 156 in the embodiment. did.
As shown in FIG. 8, the orifice 156d is formed near the rear tooth side surface 156b, which is a surface near the radially outermost side of the blocking wall 156c and faces the front tooth side surface 156a. Note that the rear tooth side surface 156 b is a surface on the rear side with respect to the positive rotation direction of the rotor 124 among the tooth side surfaces along the tooth trace direction of the scraped teeth 156. The scraping teeth 156 of the scraping ring 150 are also used as detection teeth for detecting the rotational position of the rotor 124.

Next, the operation of the electric motor unit 120 configured as described above, particularly the operation when scooping up the lubricating oil accompanying the rotation of the rotor 124 will be described.
When the in-wheel motor 100 is actuated to drive the electric motor MG of the electric motor unit 120, the rotor 124 rotates accordingly. Thereby, the lubricating oil filled in the case 30 is scraped up by the scraping teeth 156 of the scraping ring 150 attached to the inner peripheral surface of the rotor 124. At this time, the scraping teeth 156 are formed hollow inside, and the communication opening 158 is formed in the front tooth side surface 156a which is the front side with respect to the positive rotation direction of the rotor 124, so that the lubricating oil is connected to the communication opening. It flows into the hollow portion of the scraping teeth 156 via 158. Here, since the rear tooth side surface 156b which is the rear side with respect to the positive rotation direction of the rotor 124 is formed in a closed shape, the lubricating oil flowing from the communication opening 158 is surely stored in the scraping teeth 156. Can do.
In this way, the scraping ring 150 scoops up the lubricating oil while accumulating the lubricating oil in the scraping teeth 156, so that a larger amount of lubricating oil can be scooped up. In addition, since the scraping teeth 156 are simply formed hollow, the lubricant can be efficiently scraped while suppressing an increase in friction when the lubricant is scraped. Further, since the liquid level of the lubricating oil stored in the case 30 can be lowered by the amount of the lubricating oil stored in the scraping teeth 156, the stirring resistance of the electric motor MG can be reduced.

A part of the lubricating oil thus scraped up by the scraping teeth 156 directly lubricates and cools each part of the electric motor unit 120 such as the electric motor MG and the planetary gear 60 by scattering, and the rest directly or guide wall of the second case 34. 34 and is introduced into the oil reservoir 46 from the introduction port 44, and the motor unit 120 such as the planetary gear 60 and the needle bearing NBRG is connected to the oil channel OC, the lubricating oil passage 22b of the rotor shaft 22 and the radial through hole 22c. Lubricate and cool each part. On the other hand, the lubricating oil accumulated in the scraping teeth 156 is discharged from the orifice 156d toward the introduction port 44 as the rotor 124 rotates. Here, since the orifice 156d has an opening area smaller than the communication opening 158, the lubricating oil in the scraping teeth 156 is difficult to be discharged.
Thereby, the lubricating oil accumulated in the scraping teeth 156 can be held for a longer time, and the lubricating oil can be conveyed to the height of the inlet 44 formed at a relatively high position. Further, the position of the blocking wall 156c near the outermost radial direction and close to the rear tooth side surface 156b, that is, the lubricating oil in the scraping teeth 156 is most affected by the centrifugal force and the rotational force accompanying the rotation of the rotor 24. Since the orifice 156d is formed at the position where the pressure acts, the lubricating oil can be discharged from the orifice 156d vigorously. As a result, the lubricating oil supply to the inlet 44 can be made more reliable.

  Then, the lubricating oil supplied to the inlet 44 is introduced into the oil reservoir 46 and the planetary gear 60, the needle bearing NBRG, etc. via the oil channel OC, the lubricating oil passage 22b of the rotor shaft 22, the radial through hole 22c, and the like. Each part of the motor unit 120 is lubricated and cooled. In this way, since more lubricating oil can be scraped up to lubricate and cool each part of the electric motor unit 120, the lubricating performance can be improved.

  According to the lubricating structure of the second embodiment described above, the scraping teeth 156 of the scraping ring 150 that scrapes the lubricating oil are formed hollow, so that the scraping is performed when the lubricating oil is scraped along with the rotation of the rotor 124. The lubricating oil can be scraped up while accumulating the lubricating oil in the raising teeth 156. As a result, more lubricating oil can be scraped up. In addition, since the scraping teeth 156 are simply formed hollow, the lubricant can be efficiently scraped while suppressing an increase in friction when the lubricant is scraped. Further, since the liquid level of the lubricating oil stored in the case 30 can be lowered by the amount of the lubricating oil stored in the scraping teeth 156, the stirring resistance of the electric motor MG can be reduced.

  Further, according to the lubricating structure of the second embodiment, the orifice 159 serving as the lubricant outlet in the scraping teeth 156 is opened compared to the inlet opening 158 serving as the lubricant inlet into the scraping teeth 156. Since the area is reduced to make it difficult for the lubricant in the scraping teeth 156 to be discharged, the lubricant stored in the scraping teeth 156 can be held for a longer period of time and formed at a relatively high position. It can be transported to the height of the introduced inlet 44. In addition, the orifice 156d is formed in the vicinity of the radially outermost side of the closing wall 156c and closer to the rear tooth side surface 156b, so that the lubricating oil in the scraped teeth 156 is rotated with the centrifugal force and rotation accompanying the rotation of the rotor 24. The pressure can be discharged from the position where the pressure acts most, and the lubricating oil can be discharged from the orifice 156d vigorously. As a result, the lubricating oil supply to the inlet 44 can be made more reliable.

  Furthermore, according to the lubricating structure of the second embodiment, only the scraping ring 150 in which the concave portions 152 and the convex portions 154 are alternately formed is press-fitted into the inner peripheral surface of the rotor 124, so that more lubricating oil is scraped. The structure to be raised can be easily secured, and an increase in the axial length of the electric motor unit 120 can be suppressed to achieve a compact size.

  Further, according to the lubricating structure of the second embodiment, the scraping teeth 156 of the scraping ring 150 are also used as detection teeth for detecting the number of rotations of the rotor 124. Therefore, there is no need to separately provide the number of rotation detection teeth. The increase in points can be suppressed.

Next, an in-wheel motor 200 equipped with an electric motor unit 220 using a lubricating structure as a third embodiment of the present invention will be described.
The in-wheel motor 200 equipped with the electric motor unit 220 using the lubricating structure of the third embodiment is the first described with reference to FIGS. 1 and 2 except that the scraping ring 50 is changed to the scraping ring 250. It has the same configuration as the in-wheel motor 10 on which the electric motor unit 20 using the lubricating structure of the embodiment is mounted. Therefore, in the configuration of the in-wheel motor 200 of the third embodiment, the same components as those of the in-wheel motor 10 of the first embodiment are denoted by the same reference numerals, and illustration and detailed description thereof are omitted to avoid duplication. To do.

10 is an enlarged view showing the rotor 224 to which the scraping ring 250 is attached, and FIG. 11 is a front view of the rotor 224 to which the scraping ring 250 is attached as viewed from the front. FIG. 11 is a sectional view showing a ZZ section in FIG. 10.
The scraping ring 250 is formed in a ring shape in which concave portions 252 and convex portions 254 are alternately formed. As shown in FIGS. 10 and 11, the outermost peripheral surface of the convex portion 254 is the inner periphery of the rotor 224. By being press-fitted into the surface, a plurality of scraping teeth 256 in which the concave portion 252 forms a hollow portion are formed. The hollow portion formed by the concave portion 252 is closed at both longitudinal end surfaces of the concave portion 252 when the scraping ring 250 is attached to the inner peripheral surface of the rotor 224.

Of the tooth side surfaces along the tooth trace direction of the scraped teeth 256, the front tooth side surface 256a, which is the front side with respect to the positive rotation direction of the rotor 224, has a recess 252 inside and outside as a hollow portion as shown in FIGS. A communication opening 258 that communicates with each other is formed. In addition, a closing wall 256c formed on the opposite side to the flange portion 224a of the both ends in the longitudinal direction of the recess 252 that closes the hollow portion by the recess 252 has an opening as compared to the communication opening 258 as shown in the figure. An oil discharge pipe 259 having a communication hole 260 having a small area is attached. Here, the communication opening 258 is formed in the front tooth side surface 256a of all the lifting teeth 256 in the embodiment, and the oil discharge pipe 259 is formed in the blocking wall 256c of all the lifting teeth 256 in the embodiment. It was supposed to be.
As shown in FIG. 11, the oil discharge pipe 259 is disposed at a position near the rear tooth side surface 256 b, which is a surface near the radially outermost side of the blocking wall 256 c and is opposed to the front tooth side surface 256 a. It protrudes from the blocking wall 256 c so as to face the inlet 44 and the oil reservoir 46, and protrudes into the scraping teeth 256. The rear tooth side surface 256b is a surface on the rear side with respect to the positive rotation direction of the rotor 224 among the tooth side surfaces along the tooth trace direction of the scraped teeth 256. The scraping teeth 256 of the scraping ring 250 are also used as detection teeth for detecting the rotational position of the rotor 224.

Next, the operation of the electric motor unit 220 configured as described above, particularly the operation when scooping up the lubricating oil accompanying the rotation of the rotor 224 will be described.
When the in-wheel motor 200 is actuated to drive the electric motor MG of the electric motor unit 220, the rotor 224 rotates accordingly. Thereby, the lubricating oil filled in the case 30 is scraped up by the scraping teeth 256 of the scraping ring 250 attached to the inner peripheral surface of the rotor 224. At this time, the scraping teeth 256 are formed hollow inside, and the communication opening 258 is formed in the front tooth side surface 256a which is the front side with respect to the forward rotation direction of the rotor 224. It flows into the hollow portion of the scraping teeth 256 via 258. Here, since the rear tooth side surface 256b which is the rear side with respect to the positive rotation direction of the rotor 224 is formed in a closed shape, the lubricating oil flowing from the communication opening 258 is surely stored in the scooping teeth 256. Can do.
In this way, the scraping ring 250 scoops up the lubricating oil while accumulating the lubricating oil in the scraping teeth 256, so that a larger amount of lubricating oil can be scooped up. In addition, since the scraping teeth 256 are only formed hollow, the lubricant can be efficiently scraped while suppressing an increase in friction when the lubricant is scraped. Moreover, since the liquid level of the lubricating oil stored in the case 30 can be lowered by the amount of the lubricating oil stored in the scraping teeth 256, the stirring resistance of the electric motor MG can be reduced.

A part of the lubricating oil thus swung up by the scooping teeth 256 directly lubricates and cools each part of the electric motor unit 220 such as the electric motor MG and the planetary gear 60 by scattering, and the rest directly or the guide wall of the second case 34 34 and is introduced into the oil reservoir 46 from the introduction port 44, and the motor unit 220 such as the planetary gear 60 or the needle bearing NBRG via the oil channel OC, the lubricating oil passage 22b of the rotor shaft 22, the radial through hole 22c, or the like. Lubricate and cool each part.
On the other hand, the lubricating oil accumulated in the scraping teeth 256 is discharged from the communication hole 260 of the discharge pipe 259 toward the introduction port 44 as the rotor 224 rotates. Here, since the discharge pipe 259 is formed as a choke in which the communication hole 260 has an opening area smaller than the communication opening 258 and has a predetermined length, the lubricating oil in the scraping teeth 156 is simply discharged to the blocking wall 256c. It is more difficult to discharge than a hole (orifice). Thereby, the lubricating oil accumulated in the scraping teeth 256 can be held for a longer time, and the lubricating oil can be transported to the height of the inlet 44 formed at a relatively high position. Further, the position of the blocking wall 256c near the outermost radial direction and close to the rear tooth side surface 256b, that is, the lubricating oil in the scraping teeth 256 is most affected by the centrifugal force and the rotational force accompanying the rotation of the rotor 224. Since the discharge pipe 259 is disposed at a position where the pressure acts, when the lubricating oil is discharged from the communication hole 160, the lubricating oil can be discharged with great force. In addition, since the discharge pipe 259 protrudes from the blocking wall 256 c toward the introduction port 44, the lubricating oil can be supplied to the introduction port 44 more reliably.

  Then, the lubricating oil supplied to the inlet 44 is introduced into the oil reservoir 46 and the planetary gear 60, the needle bearing NBRG, etc. via the oil channel OC, the lubricating oil passage 22b of the rotor shaft 22, the radial through hole 22c, and the like. Each part of the motor unit 220 is lubricated and cooled. As described above, since it is possible to lubricate and cool each part of the electric motor unit 220 by scooping up more lubricating oil, it is possible to improve the lubricating performance.

  According to the lubricating structure of the third embodiment described above, the scraping teeth 256 of the scraping ring 250 that scrapes the lubricating oil are formed in a hollow shape. Therefore, when the lubricant is scraped along with the rotation of the rotor 224, scraping is performed. The lubricating oil can be scraped up while accumulating the lubricating oil in the raising teeth 256. As a result, more lubricating oil can be scraped up. In addition, since the scraping teeth 256 are only formed hollow, the lubricant can be efficiently scraped while suppressing an increase in friction when the lubricant is scraped. Moreover, since the liquid level of the lubricating oil stored in the case 30 can be lowered by the amount of the lubricating oil stored in the scraping teeth 256, the stirring resistance of the electric motor MG can be reduced.

  Further, according to the lubricating structure of the third embodiment, the outlet of the lubricating oil in the scraping teeth 256 is choked using the discharge pipe, so that the lubricating oil in the scraping teeth 256 is simply discharged into the blocking wall 256c. It becomes more difficult to discharge than the one forming the (orifice). As a result, the lubricating oil stored in the scraping teeth 256 can be held for a longer time, and the lubricating oil can be conveyed to the height of the inlet 44 formed at a relatively high position. Further, the position of the blocking wall 256c near the outermost radial direction and close to the rear tooth side surface 256b, that is, the lubricating oil in the scraping teeth 256 is most affected by the centrifugal force and the rotational force accompanying the rotation of the rotor 224. Since the discharge pipe 259 is disposed at a position where the pressure acts, when the lubricating oil is discharged from the communication hole 160, the lubricating oil can be discharged with great force. In addition, since the discharge pipe 259 protrudes from the blocking wall 256 c toward the introduction port 44, the lubricating oil can be supplied to the introduction port 44 more reliably. As a result, the lubrication performance is improved.

  Furthermore, according to the lubricating structure of the third embodiment, only the scraping ring 250 in which the concave portions 252 and the convex portions 254 are alternately formed is press-fitted into the inner peripheral surface of the rotor 224. The structure to be raised can be ensured easily, and an increase in the axial length of the electric motor unit 220 can be suppressed and downsizing can be achieved.

  Further, according to the lubricating structure of the third embodiment, the scraping teeth 256 of the scraping ring 250 are also used as detection teeth for detecting the number of rotations of the rotor 224. Therefore, there is no need to separately provide the number of rotation detection teeth. The increase in points can be suppressed.

  In the lubricating structures of the first embodiment, the second embodiment, and the third embodiment, the communication openings 58, 158, and 258 are formed on the front tooth side surfaces 56a, 156a, and 256a of all the scraping teeth 56, 156, and 256. However, it is not necessary to form the front tooth side surfaces 56a, 156a, and 256a of all the scooping teeth 56, 156, and 256. For example, the front tooth side surfaces 56a and 156a of one scooping tooth 56, 156, and 256 are not necessary. , 256a only, or on the front tooth side surfaces 56a, 156a, 256a of every other scraping teeth 56, 156, 256.

  In the lubricating structures of the first embodiment, the second embodiment, and the third embodiment, the communication openings 58, 158, and 258 are formed only on the front tooth side surfaces 56a, 156a, and 256a. , 156, 256 have communication openings 58, 158, 258 formed on the front tooth side surfaces 56a, 156a, 256a, and other scraping teeth 56, 156, 256 have communication openings 58, 158, 258 on the rear side. It may be formed on the tooth side surfaces 56b, 156b, and 256b. In this way, the lubricating oil can be stored in the hollow portions in the scooping teeth 56, 156, and 256 not only when the rotors 24, 124, and 224 rotate forward but also when they rotate in reverse. In this case, as illustrated in the lubricating structure of the modified example of FIGS. 13, 14, and 15, the communication openings 58, 158, 258 include front tooth side surfaces 56 a, 156 a, 256 a and rear tooth side surfaces 56 b, 156 b, 256 b Alternatively, they may be provided alternately. At this time, the shapes and arrangement positions of the guide portion 59, the orifice 156d, and the oil discharge pipe 259 may be changed corresponding to the communication openings 58, 158, and 258. In this way, substantially the same lubricating performance can be obtained when the rotors 24, 124, and 224 rotate in the forward direction and in the reverse direction.

  In the lubricating structures of the first embodiment, the second embodiment, and the third embodiment, the scraping rings 50, 150, 250 are attached to the inner peripheral surfaces of the rotors 24, 124, 224 by press fitting. Any attachment method such as fastening may be used.

  In the lubricating structures of the first embodiment, the second embodiment, and the third embodiment, the scraping teeth 56, 156 are obtained by attaching the scraping rings 50, 150, 250 to the inner peripheral surfaces of the rotors 24, 124, 224 by press fitting. , 256, the scraping teeth 56, 156, 256 may be integrally formed on the inner peripheral surfaces of the rotors 24, 124, 224.

  In the second and third embodiments, the orifice 156d and the oil discharge pipe 259 are formed closer to the rear tooth side surfaces 156b and 256b of the blocking walls 156c and 256c, but the orifice 156d and the oil discharge pipe 259 are formed. Is formed near the front tooth side surfaces 156a and 256a of the blocking walls 156c and 256c, or is formed at a substantially central portion between the front tooth side surfaces 156a and 256a and the rear tooth side surfaces 156b and 256b. There is no problem.

  In the second and third embodiments, the orifice 156d and the oil discharge pipe 259 are formed near the radially outermost side of the blocking walls 156c and 256c, but the orifice 156d and the oil discharge pipe 259 are The blocking walls 156c and 256c may be formed in the radially innermost vicinity, or may be formed in a substantially central portion between the radially innermost vicinity and the radially outermost vicinity.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

It is a block diagram which shows the outline of a structure of the in-wheel motor 10 which mounts the electric motor unit 20 using the lubrication structure as one Embodiment of this invention. It is sectional drawing which shows the VV cross section of FIG. 2 is a perspective view showing a configuration of a scraping ring 50. FIG. It is an enlarged view which expands and shows the rotor 24 with which the scraping ring 50 was attached. It is the front view which looked at the rotor 24 with which the scraping ring 50 was attached from the front. It is sectional drawing which shows the XX cross section of FIG. FIG. 3 is an enlarged view showing a rotor 124 to which a scraping ring 150 is attached. It is the front view which looked at the rotor 124 with which the scraping ring 150 was attached from the front. It is sectional drawing which shows the YY cross section of FIG. It is an enlarged view which shows the rotor 224 with which the scraping ring 250 was attached enlarged. It is the front view which looked at the rotor 224 with which the scraping ring 250 was attached from the front. It is sectional drawing which shows the ZZ cross section of FIG. It is a block diagram which shows the outline of a structure of the scraping ring 50 in the electric motor unit 20 using the lubrication structure of a modification. It is a block diagram which shows the outline of a structure of the scraping ring 150 in the electric motor unit 120 using the lubrication structure of a modification. It is a block diagram which shows the outline of a structure of the scraping ring 250 in the electric motor unit 220 using the lubrication structure of a modification.

Explanation of symbols

2 Output shaft 10, 100, 200 In-wheel motor 20, 120, 220 Motor unit 22 Rotor shaft 22a Bolt 22b Lubricating oil passage 22c Through hole 24, 124, 224 Rotor 24a, 124a, 224a Flange portion 26 Stator 30 Case 32 First Case 34 Second case 34a Opening 34b Guide wall 36 Third case 38 Bolt 40 Cover member 42 Bolt 44 Inlet 46 Oil reservoir 50, 150, 250 Raised ring 52, 152, 252 Concavity 54, 154, 254 Convex 56 , 156, 256 Raised teeth 56a, 156a, 256a Front tooth side face 56b, 156b, 256b Rear tooth side face 56c Opening part 58, 158, 258 Communication opening 59 Guide part 60 Planetary gear 62 Sun gear 64 Ring Ya 66 pinion gear 68 Carrier 80 speed sensor 156c, 256c closing wall 156d orifice 259 oil discharge pipe 260 communicating hole MG motor BRG1 bearing BRG2 bearing OC oil channel NBRG needle bearing

Claims (18)

A scraping member capable of scooping up the lubricating oil with the rotation of the rotating shaft is provided, and at least a part of each part of the power mechanism is lubricated directly or indirectly using the lubricating oil scraped up by the scraping member. A lubrication structure,
Lubrication structure in which the scraping member is formed such that at least the scraping portion for scraping the lubricating oil is formed in a hollow, and an introduction opening through which the lubricating oil can be introduced into the scraping portion formed in a hollow is formed .   The lubrication structure according to claim 1, wherein the scraping portion is formed in a hollow shape in a state in which a surface facing the introduction opening is closed. The scraping part is formed in a tooth shape,
The lubricating structure according to claim 1, wherein the introduction opening is formed on a tooth side surface along a tooth trace direction.   The lubricating structure according to claim 3, wherein the introduction opening is formed on at least a front tooth side surface which is a front side in the rotation direction of the scraping member among the tooth side surfaces. The scraping member has a first scraping portion and a second scraping portion in the circumferential direction as the scraping portion,
The introduction opening is formed on the side surface on the front side in the first scraping portion, and on the second scraping portion, a rear tooth that is the rear side in the rotation direction of the scraping member among the tooth side surfaces. The lubricating structure according to claim 4, wherein the lubricating structure is formed on a side surface.   The lubricating structure according to claim 5, wherein the scraping member is formed by alternately forming the first scraping portion and the second scraping portion in the circumferential direction.   The lubricating structure according to any one of claims 1 to 6, wherein the scraping portion is formed with a lead-out portion capable of leading the lubricating oil introduced from the introduction opening.   The lubricating structure according to claim 7, wherein the lead-out portion is formed closer to a facing surface facing the surface than a surface of the scraping portion where the introduction opening is formed.   The lubricating structure according to claim 7 or 8, wherein the lead-out portion is formed so that an amount of the lubricating oil led out is smaller than an amount of the lubricating oil introduced from the introduction opening.   The lubricating structure according to claim 9, wherein the lead-out portion is formed in an opening having a smaller area than the introduction opening.   The lubricating structure according to claim 10, wherein the lead-out portion is formed as a choke.   The lubricating structure according to any one of claims 7 to 11, further comprising a guide member that guides a direction in which the lubricating oil is led out from the leading portion.   The lubricating structure according to claim 12, wherein the guide member is formed in the vicinity of the lead-out portion. An electric motor unit as the power mechanism including an electric motor having a rotor shaft as the rotating shaft and a rotor that rotates integrally with the rotor shaft,
The electric motor unit which arrange | positions the said scraping member on the internal peripheral surface of the said rotor, and lubricates at least one part of each part using the lubrication structure in any one of Claim 1 thru | or 13.   15. The electric motor unit according to claim 14, wherein the scraping member is formed by fitting a ring-shaped member having teeth in the circumferential direction as the scraping portion to the inner peripheral surface of the rotor.   16. The electric motor unit according to claim 14, wherein the scraping member is formed as a rotation speed detection tooth for detecting the rotation speed of the rotor by the scraping portion. An electric motor case that houses the electric motor and forms a storage portion that stores the lubricating oil scraped up together with other members;
In the rotor shaft, a lubricating oil passage as a flow passage for the lubricating oil is formed in the center of the shaft, and a through hole as a supply port for the lubricating oil is formed to penetrate from the lubricating oil passage in a radial direction, The electric motor unit according to any one of claims 14 to 16, wherein the lubricating oil supplied from the reservoir to the lubricating oil passage is supplied to each part from the through hole by rotation. An in-wheel motor that drives a drive wheel by arranging the electric motor unit according to any one of claims 14 to 17 in a wheel,
The electric motor unit has a planetary gear mechanism that decelerates the power from the electric motor and outputs it to the drive wheels.
Connecting the rotor shaft and the output shaft connected to the drive wheel to two of the three rotating elements of the planetary gear mechanism,
An in-wheel motor in which another rotating element is non-rotatably supported by the case of the electric motor unit.

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