JP5549086B2 - Drive unit - Google Patents

Description

  The present invention relates to a drive unit that lifts and lubricates oil by rotation of a rotating body.

  Conventionally, a technique described in Patent Document 1 has been disclosed as a technique for reducing friction of a rotating body and ensuring an amount of oil to be lubricated. In this publication, the oil is pumped up by the rotation of the rotating body, and the oil is stored in the oil tank provided in the upper part of the unit, thereby reducing the amount of oil stored in the lower part of the rotating body and lowering the oil level. Thus, the friction of the rotating body is reduced.

JP 2005-8143 A

  However, there is a problem that it takes time until the oil stored in the lower part of the rotating body is lifted and the oil level is lowered, and the efficiency is reduced until the friction is reduced.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a drive unit capable of quickly reducing the oil level.

In order to achieve the above object, according to the first aspect of the present invention, a first oil chamber surrounding a region where the rotating body is immersed, a second oil chamber formed outside the first oil chamber, a first oil chamber, 2 A partition plate that isolates the oil chamber, and a partition plate that is connected to the first oil chamber and the second oil chamber. The flow rate per unit time that flows from the second oil chamber to the first oil chamber is rotated. And a flow path that is set to be smaller than a flow rate that is swept up per unit time by the body, the flow paths are provided at different heights in the vertical direction of the partition plate, and are provided on the upper side of the partition plate. The flow path is immersed in oil when the rotational speed of the rotating body is relatively low, and is exposed from the oil when the rotational speed is relatively high. The flow path provided below the partition plate has a relative rotational speed of the rotating body. Oil even when it is low or rotating And so it is immersed.
In the second aspect of the invention, the first oil chamber surrounding the area where the rotating body is immersed, the second oil chamber formed outside the first oil chamber, and the first oil chamber and the second oil chamber communicate with each other. And a flow path set so that the flow rate per unit time flowing from the second oil chamber to the first oil chamber is smaller than the amount of oil swirled per unit time by the rotating body, The first oil chamber and the second oil chamber are formed by partitions, and the height of the partitions is made variable as required.

  Accordingly, the speed at which the oil pumped up by the rotating body returns to the first oil chamber via the second oil chamber is reduced, and the oil level in the first oil chamber can be quickly lowered.

FIG. 3 is a schematic diagram illustrating a drive unit according to the first embodiment. FIG. 3 is a schematic diagram illustrating a lubrication state of the drive unit according to the first embodiment. 6 is a schematic diagram illustrating a pore diameter determination process of Example 2. FIG. FIG. 6 is a schematic diagram illustrating a drive unit according to a third embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to a fourth embodiment. It is the schematic which shows the other structural example by the number and position of a through-hole. FIG. 10 is a schematic diagram illustrating a drive unit according to a fifth embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to a sixth embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to a sixth embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to a sixth embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to a seventh embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to a seventh embodiment. FIG. 10 is a schematic diagram illustrating a drive unit according to an eighth embodiment.

  FIG. 1 is a schematic diagram illustrating a configuration of a drive unit according to the first embodiment. Fig.1 (a) shows AA sectional drawing, FIG.1 (b) shows BB sectional drawing. The drive unit has a cylindrical housing 1 that is closed on both sides, a stator 2 that is fixedly supported on the inner periphery of the housing 1 and includes a plurality of coils, and a plurality of permanent magnet pairs that rotate on the inner periphery side of the stator 2. And a drive shaft 4 that rotates integrally with the rotor 3. The stator 2 and the rotor 3 constitute an electric motor. As shown in FIG. 1, the housing 1 represents a state mounted on a vehicle or the like, and the upper direction in FIG. 1 coincides with the upper vertical direction when mounted on the vehicle (hereinafter referred to as “upper”), and the lower direction. Corresponds to the lower part in the vertical direction when the vehicle is mounted (hereinafter referred to as lower). In the following description, the terms “high” and “low” represent the concept along the vertical direction.

  A first side wall 1a for closing the cylindrical portion is formed on the left side surface of the housing 1 in FIG. 1B, and an oil pocket 6 is attached to the first side wall 1a. The oil pocket 6 is provided at substantially the same height as the drive shaft 4, and is formed below the oil introduction port 6a, the oil storage portion 6b, and the oil storage portion 6b that are opened above the drive shaft 4 as a throttle. And a functioning oil discharge port 6c. Since the oil stored in the oil storage part 6b is gradually dropped from the oil discharge port 6c, it is configured to discharge over a predetermined time while storing a certain amount.

  A second side wall 1b that closes the cylindrical portion is formed on the right side surface of the housing 1 in FIG. A through hole 1b1 through which the drive shaft 4 passes is formed in the approximate center of the second side wall 1b, and the rotational driving force of the rotor 3 can be taken out of the drive unit.

  A predetermined amount of oil is stored in the housing 1, and the static oil level that is the oil level when the drive unit is stopped is set to be slightly lower than the drive shaft 4. Yes. On the other hand, the dynamic oil level that is the oil level when the drive unit is driven is set to be slightly above the lower end of the rotor 3.

  In the lower part of the housing 1 and in the region where the oil is stored, the partition plates 5 are arranged on the front and rear sides of the rotor 3. A first oil chamber 10 is formed between the two partition plates 5, that is, a position surrounding the rotor 3, and the second oil chamber 20 is formed between the side walls 1 a and 1 b of the housing 1 and the partition plate 5. Is formed. The first oil chamber 10 is provided so as to surround a region where the rotor 3 is immersed, and the second oil chamber 20 is formed outside the first oil chamber 10. The height of the partition plate 5 is set to substantially the same height as the static oil level, in other words, the height reaching the diameter of the rotor 3. Further, the capacities of the first oil chamber 10 and the second oil chamber 20 are set based on the required capacity for the oil chamber.

  One through hole 5a as a flow path is formed at the lower end of the partition plate 5, in other words, below the lowermost end of the rotor 3 or at the lowermost end of the second oil chamber 20. The hole diameter of the through hole 5a is such that the flow rate flowing from the second oil chamber 20 into the first oil chamber 10 per unit time is larger than the amount of oil being lifted up per unit time by the rotor 3 in a certain drive state of the drive unit. Is set to be small.

[Lubrication]
Next, the lubrication action in the drive unit of Embodiment 1 will be described. FIG. 2 is a schematic diagram illustrating a lubrication state of the drive unit according to the first embodiment. In FIG. 2, the arrows indicate the flow of oil. When the rotor 3 rotates, the oil adhering to the outer periphery and the side surface of the rotor 3 is lifted up along the rotor 3. The raked oil returns to the lower side again while being scattered on the stator 2 and the like. At this time, the part indicated by the arrow α in FIG. 2 indicates the part introduced into the oil pocket 6, the part indicated by the arrow β indicates the part returned to the second oil chamber 20, and the part indicated by the arrow γ indicates the first oil. The amount returned to the chamber 10 and the amount indicated by the arrow δ indicates the amount returned from the second oil chamber 20 to the first oil chamber 10 through the through hole 5a.

  The rotor 3 is immersed in the first oil chamber 10, and only the oil in the first oil chamber 10 is lifted up by the rotation of the rotor 3. On the other hand, the amount of the refluxed oil is reduced by the amount stored in the oil pocket 6 as indicated by the arrow α. In addition, as for the part directly returning to the second oil chamber 20 as shown by the arrow β, the part flowing into the first oil chamber 10 from the second oil chamber 20 shown by the arrow δ is limited. 20 keeps overflowing. As a result, only the oil level of the first oil chamber 10 is lowered, and this amount of oil is stored in the oil pocket 6.

  Here, it is clear that the amount of oil in the first oil chamber 10 is smaller than that in the case without the partition plate 5 (that is, the total amount of liquid in the first oil chamber 10 and the second oil chamber 20) due to the partition plate 5. Therefore, the liquid level is lowered more rapidly than when the partition plate 5 is not provided. As a result, when the rotor 3 rotates, the oil level can be lowered only by storing a small amount of oil in the oil pocket 6, and accordingly, the friction associated with the oil scooping is lowered. Moreover, it is expected that the oil that has been stirred up and diffused contains bubbles. In this case, since the oil is supplied to the first oil chamber 10 from the lower through hole 5a via the second oil chamber 20, the second oil chamber 20 functions as a defoaming chamber.

As described above, the effects listed below can be obtained in the first embodiment.
(1) A housing 1 that stores a predetermined amount of oil in a lower portion, a rotor 3 that is housed in the housing 1, is partially immersed in the oil when not rotating, and lifts the oil when rotating; A first oil chamber 10 formed and surrounding a region where the rotor 3 is immersed; a second oil chamber 20 formed in the housing 1 and formed outside the first oil chamber 10; The second oil chamber 20 is communicated so that the flow rate per unit time flowing from the second oil chamber 20 to the first oil chamber 10 is smaller than the amount of oil swirled per unit time by the rotor 3. And a set through-hole 5a (flow path). Therefore, the liquid level of the first oil chamber 10 in which the rotor 3 is immersed can be quickly lowered, and the friction generated by scooping up the oil when the rotor rotates can be quickly reduced. Along with this, it is possible to suppress a decrease in efficiency due to friction. Further, since the oil amount for lubrication is oil stored in the first oil chamber 10 and the second oil chamber, it is possible to suppress a decrease in the lubrication capacity as a unit. Moreover, since the stirring of the oil by the rotor 3 is suppressed, the temperature rise of the oil can be effectively suppressed.

  (2) By providing the through hole 5a (flow path) below the lowermost end of the rotor 3, the second oil chamber 20 can be used as a defoaming chamber, and the defoamed oil is scraped up. Thus, the friction can be further reduced.

  (3) By providing the through hole 5a (flow path) at the lowermost end of the second oil chamber 20, all the oil in the second oil chamber 20 can be used effectively.

  (4) Since the height of the partition plate 5 (partition) is within the diameter of the rotor 3, only the oil in the first oil chamber 10 can be swept up, and the oil level can be lowered quickly.

  (5) Since the first oil chamber 10 and the second oil chamber 20 are formed by the partition plate 5 in which the through holes 5a are formed as flow paths, the present invention can be realized with a simple configuration.

  (6) Since the first oil chamber 10 and the second oil chamber 20 are arranged side by side in the direction of the rotation axis of the rotor 3, the first oil chamber 10 can be designed compactly while ensuring the required amount of oil. The surface can be lowered quickly.

  (7) The capacities of the first oil chamber 10 and the second oil chamber 20 are set on the basis of the required capacity of the oil chamber. By setting the partition plate position so as to define the above, it is possible to set so as to satisfy the requirements such as lubrication and friction.

  Next, Example 2 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. In the first embodiment, the hole diameter of the through hole 5a is set so that the flow rate per unit time flowing from the second oil chamber 20 to the first oil chamber 10 is smaller than the amount of oil being lifted per unit time by the rotor 3. Set. On the other hand, Example 2 shows a hole diameter determination process for obtaining a more optimal flow rate. FIG. 3 is a schematic diagram illustrating a pore diameter determination process according to the second embodiment. First, as shown in FIG. 3A, the rotational speed of the drive unit is taken on the horizontal axis, and the flow rate obtained by the rotational speed is taken on the vertical axis. When the drive unit is rotated from 0 to the maximum number of rotations, the required flow rate changes in a substantially linear relationship according to each number of rotations.

  Here, when a certain number of revolutions Rev1 is reached, a point that satisfies the necessary lubrication flow rate required at the maximum unit rotation number, that is, a point that no further increase in the lubrication flow rate is required at any rotation speed region appears. To do. From the viewpoint of reducing friction, it is preferable to reduce the flow rate above this point by reducing the flow rate by restricting the flow rate with an orifice. Therefore, the hole diameter of the through hole 5a is set to a hole diameter that can restrict the flow rate equal to or higher than this flow rate.

  FIG. 3B is a time chart showing a drop in the oil level when the rotor 3 is rotated at a rotational speed that is equal to or higher than the rotational speed Rev1 and has the highest usage rate in a predetermined traveling mode. The predetermined traveling mode refers to a case where the vehicle travels in accordance with a traveling standard in which start, stop, slope, etc. are set, such as 10-15 mode. As a comparative example, an example in which only the oil pocket 6 is provided without the partition plate 5 is shown. First, a comparative example will be described. At the time t1, when the point at which the flow rate required for scraping and the flow rate necessary for lubrication is balanced is reached, the oil level decreases due to the increase in the scraping flow rate and storage in the oil pocket 6, but the entire housing 1 serves as an oil chamber. Therefore, the oil level does not decrease unless a large amount of oil is pumped up, and it takes time to decrease the level (see time t2). On the other hand, in the drive unit in which the hole diameter of the second embodiment is set, the oil liquid level can be lowered simply by pumping only the oil in the first oil chamber 10, and the oil liquid level can be lowered more quickly (time). t11).

As described above, in the second embodiment, the following operational effects can be obtained.
(8) Since the through-hole 5a (flow path) is set so that the amount of oil picked up according to the state of the unit, the amount of oil required for lubrication is lifted up, so that unnecessary work is performed. The efficiency can be improved.

  (9) Since the through-hole 5a (flow path) is set to an optimum flow rate when the rotation speed of the rotor 3 is the highest in a predetermined traveling mode, it is scraped up in a high frequency range. Overall efficiency can be increased by adjusting the amount.

  Next, Example 3 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. FIG. 4 is a schematic diagram illustrating a drive unit according to the third embodiment. In Examples 1 and 2, the through-hole 5a was formed, and the appropriate oil liquid level was controlled by appropriately setting the hole diameter. On the other hand, in the third embodiment, when the orifice effect is generated, the orifice effect is made variable to obtain characteristics according to the operating state of the drive unit. 4A, an electromagnetic valve 51 is provided at the location of the through hole 5a, and the opening area of the through hole 5a is changed by the stroke of the electromagnetic valve 51. FIG. For example, as shown in FIG. 3 (a), the required flow rate varies depending on the number of revolutions, so the opening area of the through hole 5a is changed according to the number of revolutions, and more efficient oil level management is performed. . As another example, in FIG. 4B, a shape memory alloy may be provided at the location of the through hole 5a. The opening degree of the communication hole 5a is changed depending on the temperature with a shape memory alloy or the like. Specifically, if the oil temperature is high, the viscosity decreases, so the opening degree is reduced. If the oil temperature is low, the viscosity increases, so the opening degree is increased.

As described above, the following operational effects can be obtained in the third embodiment.
(10) The through-hole 5a (flow path) can be set to an optimum flow rate according to the rotational speed or an optimum flow rate according to the oil temperature by making the flow rate variable according to the state of the unit. Therefore, the frying friction can be effectively reduced.

  Next, Example 4 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. FIG. 5 is a schematic diagram illustrating a drive unit according to the fourth embodiment. In the drive unit of the first embodiment, one through hole 5 a is provided at the lowermost end of the partition plate 5. On the other hand, the fourth embodiment differs in that in addition to the through hole 5a, an upper through hole 5b is provided above the through hole 5a at a position on the inner peripheral side with respect to the outer shape of the rotor as viewed from the axial direction. In other words, in the fourth embodiment, a plurality of through holes are formed in the partition plate 5, thereby adjusting the oil level change characteristic or the lubrication characteristic.

  When it is desired to perform more oil scooping in the early stage of the rotation of the rotor 3, the portion of oil shown in the region A1 in FIG. 5A can be supplied from the upper through hole 5b to the first oil chamber 10 side. In other words, at the initial stage by the oil scooping, the oil in both the first oil chamber 10 and the second oil chamber 20 is used, and after the predetermined amount of oil is scooped up, as in the first embodiment, the first The oil in the oil chamber 10 is fried up. Thus, the amount of oil scraped and the amount of lubrication can be adjusted by appropriately adjusting the position, number and diameter of the through holes.

  FIG. 6 is a schematic view showing another configuration example depending on the number and position of the through holes. For example, as shown to Fig.6 (a), you may comprise like the upper through-hole 5b1 which has arrange | positioned three through-holes in the horizontal direction in the upper part. Moreover, as shown in FIG.6 (b), it may comprise like the through-hole 5a1 arrange | positioned in the horizontal direction only at the lower part like Example 1, and you may adjust a flow volume. Further, as shown in FIG. 6C, a plurality of upper through holes 5b2 may be arranged along the outer shape of the rotor. In this case, even when the oil level is inclined due to the acceleration / deceleration during traveling, the plurality of upper through holes 5b2 communicate with the first oil chamber 10, so that a stable amount of lubricating oil can be supplied. Needless to say, the structure of the through hole shown in FIG. 5 and the structure of the through hole shown in FIGS. 6A, 6B, and 6C may be appropriately combined to obtain desired characteristics. .

As described above, in the fourth embodiment, the following effects can be obtained.
(11) Since a plurality of through holes (flow paths) are provided, the rate of change in the height of the oil level in the first oil chamber 10 and the second oil chamber 20 can be adjusted as appropriate.

  (12) Since one or more of the plurality of through holes (flow paths) are provided below the lowermost end of the rotor 3, the through holes provided below the lowermost end are described in the first embodiment. As in the above, the change speed of the oil level can be controlled.

  (13) By providing a plurality of through-holes (flow paths) in the vertical direction (see FIG. 5B), the upper through-hole provided on the upper side is required when a large amount of oil is to be pumped up when starting. A large amount of oil can be secured up to 5b. Further, when the oil liquid level falls below the upper through hole 5b, the change speed of the oil liquid level can be controlled by the through hole 5a. Moreover, the change speed of an oil level can be adjusted by changing the space | interval of the upper through-hole 5b and the through-hole 5a. For example, it is possible to control the demand for the amount of lubricating oil according to the vehicle speed. In particular, the oil level can be kept high at low vehicle speeds where the number of rakes is small, and the amount of rake can be increased at one time.

  (14) By providing a plurality of through holes (flow paths) in the lateral direction, various flow rate adjustments can be made not limited to the hole diameter.

  (15) By providing a plurality of through-holes 5b2 (flow paths) along the outer shape of the rotor 3, the plurality of through-holes 5b2 are provided even when the oil level is inclined due to vehicle acceleration / deceleration or the like. Since the first oil chamber 10 and the second oil chamber 20 communicate with each other, the change speed of the oil level can be stabilized.

  (16) By providing one or more of the plurality of through-holes (flow paths) above the lowermost end of the rotor 3, the first oil chamber 10 and the second oil can be used during low rotation such as when starting. Both oils in chamber 20 can be raked. Further, after the oil level falls below the through hole, the oil level can be quickly lowered, and friction can be effectively suppressed.

  Next, Example 5 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. FIG. 7 is a schematic diagram illustrating a drive unit according to the fifth embodiment. The drive unit according to the fifth embodiment houses a planetary gear mechanism PG as a speed reduction mechanism. The planetary gear mechanism PG includes a ring gear R fixed to the inner periphery of the housing 1, a sun gear S connected to the rotor 3, and a pinion carrier PC that supports a pinion P that meshes with both the ring gear R and the sun gear S. The drive unit decelerates the rotation of the rotor 3 according to the reduction ratio of the planetary gear mechanism PG, and outputs it from the pinion carrier PC.

  The speed reduction mechanism PG is disposed so as to be immersed in the second oil chamber 20 disposed on the second side wall 1b side. In other words, the partition plate 50 is disposed between the rotor 3 and the speed reduction mechanism PG. The basic configuration of the partition plate 50 is the same as that of the partition plate 5, but the setting of the through hole 50a formed at the lowermost end is different from that of the through hole 5a. As described above, by adjusting the flow rate through the through hole 50a, various requirements for the drive unit can be met.

  For example, when the oil level on the rotor 3 side is high and the friction tends to increase, the liquid level in the first oil chamber 10 needs to be quickly reduced. Therefore, the hole diameter of the through hole 50a is reduced, and the amount of oil flowing from the second oil chamber 20 to the first oil chamber 10 is set to be small. As a result, the amount of oil in the speed reduction mechanism PG is ensured while the friction reduction on the rotor 3 side is accelerated. On the other hand, when the friction on the speed reduction mechanism PG side tends to be higher than the friction on the rotor 3 side, it is necessary to quickly lower the oil level in the second oil chamber 20 installed on the second side wall 1b side. . Therefore, the hole diameter of the through hole 50a is increased, and the oil flowing from the second oil chamber 20 on the second side wall 1b side to the first oil chamber 10 side is set large. As a result, the reduction in friction on the speed reduction mechanism PG side can be accelerated. In this way, the rotor 3 and the speed reduction mechanism PG can be separated from each other via the partition plate 50 to meet various requirements.

As described above, in the fifth embodiment, the following operational effects can be obtained.
(17) Since the housing 1 has the speed reduction mechanism PG, and the speed reduction mechanism PG is disposed outside the first oil chamber 10, the oil amount of each oil chamber according to the friction between the rotor 3 and the speed reduction mechanism PG. Can be changed. If the friction of the rotor 3 is large, the first oil chamber 10 is reduced to increase the volume of the second oil chamber 20 on the speed reduction mechanism PG side. If the friction of the speed reduction mechanism PG is large, the second oil on the speed reduction mechanism PG side is increased. The volume of the first oil chamber 10 is set to be large by reducing the volume of the chamber 20. Thus, setting according to a request | requirement is attained.

  Next, Example 6 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. 8 and 9 are schematic views showing a drive unit according to the sixth embodiment. In Example 1, the static oil level and the height of the partition plate 5 were set to be substantially the same. On the other hand, in the sixth embodiment, the height position of the partition plate 5 is set as required for the static oil level.

  FIG. 8 shows a drive unit in which the height of the partition plate 5 is set higher than the static oil level. Since the height of the partition plate 5 is higher than the static oil level, only the oil in the first oil chamber 10 can be lifted up from the initial rotation of the rotor 3, and the oil level is quickly lowered.

  FIG. 9 shows a drive unit in which the height of the partition plate 5 is set lower than the static oil level. Since the height of the partition plate 5 is lower than the static oil level, it is sufficient to pump up the oil in both the first oil chamber 10 and the second oil chamber 20 until the predetermined amount of oil is pumped up by the rotation of the rotor 3. The amount of lubricating oil is ensured.

  FIG. 10 shows a drive unit in which the height of the partition plate 5 can be changed higher or lower than the static oil level depending on the state. A slide member 51 slidable up and down by an actuator is attached to the upper end portion of the partition plate 5, and the friction and the amount of lubricating oil can be appropriately controlled by sliding up and down according to the oil temperature, acceleration / deceleration and the like. .

As described above, according to the sixth embodiment, the following operational effects can be obtained.
(18) The first oil chamber 10 and the second oil chamber 20 are formed by a partition plate 5 (partition), and the height of the partition plate 5 is set according to demand, so that oil corresponding to the unit state can be obtained. It can be lifted up and the friction can be reduced.

  (19) The height of the partition plate 5 may be set higher than the static oil level of the rotor 3 (oil level during non-rotation) so that the oil is lifted only by the first oil chamber 10. The oil level can be lowered quickly. Moreover, unnecessary oil can be stored in the second oil chamber 20, and friction can be reduced.

  (20) By setting the height of the partition plate 5 to be lower than the static oil level of the rotor 3 (oil level during non-rotation), a large amount of oil can be lifted up even when starting. In addition, it is possible to quickly eliminate the uneven oil in the oil chamber and reduce the friction.

  (21) By making the height of the partition plate 5 variable as required, the required amount of filing can be controlled according to the state of the unit.

  Next, Example 7 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. 11 and 12 are schematic views showing a drive unit according to the seventh embodiment. In the first embodiment, the bottom height of the first oil chamber 10 and the bottom height of the second oil chamber 20 are set to be the same. On the other hand, in the seventh embodiment, the relationship between the bottom height of the first oil chamber 10 and the bottom height of the second oil chamber 20 is set as required. That is, by providing a height difference at the bottom of the oil chamber, the flow of oil and the flow of contamination from the second oil chamber 20 to the first oil chamber 10 are controlled.

  FIG. 11 shows a drive unit in which the bottom 1 c of the second oil chamber 20 is set higher than the bottom of the first oil chamber 10. Since the bottom of the second oil chamber 20 is higher than the bottom of the first oil chamber 10, all of the oil supplied to the second oil chamber 20 flows into the first oil chamber 10 side. That is, when the oil is circulated by oil scooping up, all the oil can be circulated, so that the temperature rise is suppressed.

  FIG. 12 shows a drive unit in which the bottom 1 d of the first oil chamber 10 is set higher than the bottom of the second oil chamber 20. When oil flows from the second oil chamber 20 to the first oil chamber 10, contamination and the like can be captured by the step between the bottom of the second oil chamber 20 and the bottom 1 d of the first oil chamber 10. Contamination represents a metal powder or various impurities mixed in the oil and generally has a higher specific gravity than the oil. Therefore, by capturing contaminants or the like in this step, it is possible to suppress a reduction in aggressiveness to the rotor 3 and adhesion of dust to other lubrication sites.

  As described above, in the seventh embodiment, the following operational effects can be obtained.

  (22) By setting the bottom height of the first oil chamber 10 and the bottom height of the second oil chamber 20 as required, an oil flow rate corresponding to the unit state can be supplied. Various effects such as improvement of oil circulation efficiency and contamination capture can also be expected.

  (23) By setting the height of the bottom 1c of the second oil chamber 20 higher than the height of the bottom of the first oil chamber 10, all the oil in the second oil chamber 20 is poured into the first oil chamber 10. The temperature rise can be suppressed by increasing the oil circulation efficiency.

  (24) Capturing contaminants such as iron powder in the bottom of the second oil chamber 20 by setting the height of the bottom 1d of the first oil chamber 10 to be higher than the height of the bottom of the second oil chamber 20. Thus, it is possible to suppress a reduction in aggressiveness to the rotor 3 and adhesion of dust to other lubrication sites.

  Next, Example 8 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. FIG. 13 is a schematic diagram illustrating a drive unit according to the eighth embodiment. In the eighth embodiment, a return member 52 is provided at the upper end of the partition plate 5, and a drain 30 for removing oil is provided at the bottom of the second oil chamber 20.

  For example, when the present drive unit is applied to a wheel-in motor, it is disposed under the suspension spring. The unsprung portion has a larger vertical stroke than the vehicle body depending on the road surface condition and the like. Therefore, if the oil is scattered with the stroke, even if the oil is divided into the first oil chamber 10 and the second oil chamber 20, an unexpected oil is transferred from the second oil chamber 20 to the first oil chamber 10 side. Movement occurs. Therefore, a return member 52 is provided at the upper end portion of the partition plate 5, thereby capturing the scattered oil and returning it to the respective oil chambers.

  Basically, the oil is raked up by the rotor 3 and then circulates and flows from the second oil chamber 20 to the first oil chamber 10 through the through hole 5a. Therefore, contamination or the like is easily captured in front of the through hole 5 a, that is, in the bottom of the second oil chamber 20. That is, the through hole 5a serves as a filter. Therefore, by providing the drain 30 at the bottom of the second oil chamber 20, it becomes easy to remove contaminants and the like when exchanging oil, and the maintenance is improved. In this case, as shown in FIG. 12, if the bottom of the second oil chamber 20 is set lower than the bottom of the first oil chamber 10, contamination can be more effectively removed.

As described above, the effects listed below can be obtained in the eighth embodiment.
(25) Since the return member 52 (oil return mechanism) is provided above the first oil chamber 10 and / or the second oil chamber 20, even if a drive unit is adopted as a wheel-in motor and the suspension spring is disposed below, The oil level can be properly managed by suppressing the scattering of oil.

  (26) Since the oil drain 30 is provided in the second oil chamber 20, contamination and the like can be effectively removed during oil replacement.

  As described above, the description has been given based on the first to eighth embodiments. However, the present invention is not limited to the above configuration, and other configurations may be adopted as long as they are within the scope of the invention. For example, in each embodiment, the oil pocket 6 is provided, but the oil pocket is not necessarily provided. Specifically, the height of the partition plate 5 is set higher than the static oil level, and the oil pumped up from the first oil chamber 10 is stored in the second oil chamber 20. That's fine.

  In each embodiment, the first oil chamber 10 and the second oil chamber 20 are formed by the partition plate 5. However, the rib structure is provided in the housing, not limited to the plate member, and the first oil chamber 10 is provided by this rib structure. And the second oil chamber 20 may be formed. In this case, the partition is not a separate member, but can be configured simultaneously with the formation of the housing by casting or the like, and the manufacturing cost can be reduced. In the embodiment, the through hole is set as the flow path. However, the through hole is not limited to the through hole, and may be set using an oil passage, a pipe, or the like formed inside the partition wall.

  Moreover, although the drive unit which forms a some through-hole in the partition plate 5 was set as Example 4, and the drive unit which sets the height of the partition plate 5 suitably with respect to a static oil level was described as Example 6, these were described suitably. You may adjust so that the optimal change speed of an oil level may be obtained combining. Similarly, the seventh embodiment that adjusts the height of the bottom of the oil chamber and the eighth embodiment that includes the oil return member 52 and the drain 30 may be appropriately combined with other embodiments.

  In each embodiment, the drive unit including one rotor is described as the rotor 3. However, the drive unit may be used in a sub-shaft multilayer motor including an inner rotor on the coaxial inner diameter side and an outer rotor on the outer shape side.

  In each embodiment, the rotor of the electric motor has been described as the rotating body. However, the present invention is not limited to the electric motor but is applied to a drive unit (for example, a multi-plate clutch) in which the rotating body that needs cooling is rotating. Also good.

1 Housing 2 Stator 3 Rotor (Rotating Body)
4 Drive shaft 5 Partition plate (partition)
5a Through hole (flow path)
6 Oil pocket 10 First oil chamber 20 Second oil chamber 30 Drain 51 Slide member 52 Return member
PG planetary gear mechanism (reduction mechanism)

Claims (24)

A housing for storing a predetermined amount of oil at the bottom;
A rotating body housed in the housing, partially immersed in the oil when not rotating, and scraping the oil when rotating;
A first oil chamber formed in the housing and surrounding a region where the rotating body is immersed;
A second oil chamber formed in the housing and formed outside the first oil chamber;
A partition plate that separates the first oil chamber and the second oil chamber;
Provided on the partition plate, the first oil chamber communicates with the second oil chamber, and a flow rate per unit time flowing from the second oil chamber to the first oil chamber is reduced by the rotating body per unit time. A flow path that is set to be smaller than the amount of oil being swirled by
With
The flow paths are provided at different heights in the vertical direction of the partition plate,
The flow path provided on the upper side of the partition plate is immersed in the oil when the rotational speed of the rotating body is relatively low, and is exposed from the oil when relatively high,
The drive unit characterized in that the flow path provided below the partition plate is immersed in the oil regardless of whether the rotational speed of the rotating body is relatively low or rotating. The drive unit according to claim 1,
The drive unit is characterized in that the flow path is set so as to have an amount of oil scraping according to a state of the unit. The drive unit according to claim 1 or 2,
The drive unit is characterized in that the flow path is set to an optimum flow rate when the rotation speed of the rotating body is the highest in a predetermined travel mode. The drive unit according to any one of claims 1 to 3,
The drive unit is characterized in that the flow rate of the flow path is variable according to the state of the unit. The drive unit according to any one of claims 1 to 4,
The drive unit characterized in that the flow path provided below the partition plate is provided below the lowest end of the rotating body. The drive unit according to any one of claims 1 to 5,
The drive unit, wherein the flow path provided below the partition plate is provided at a lowermost end of the second oil chamber. The drive unit according to any one of claims 1 to 6,
A drive unit characterized in that the flow path is provided in a vertical direction. The drive unit according to any one of claims 1 to 7,
A drive unit characterized in that the flow path is provided in a lateral direction. The drive unit according to any one of claims 1 to 8,
A drive unit characterized in that the flow path is provided along the outer shape of the rotating body. The drive unit according to any one of claims 1 to 9,
Drive unit, characterized in that the flow passage provided on the upper side of the partition plate, provided above the lowermost end of the rotating body. The drive unit according to any one of claims 1 to 10,
The drive unit according to claim 1, wherein the first oil chamber and the second oil chamber are arranged side by side in a rotation axis direction of the rotating body. The drive unit according to any one of claims 1 to 11,
The capacity of the first oil chamber and the second oil chamber is set based on a required capacity for the oil chamber. The drive unit according to any one of claims 1 to 12,
A reduction mechanism in the housing;
The drive unit, wherein the speed reduction mechanism is disposed outside the first oil chamber. The drive unit according to any one of claims 1 to 13,
The drive unit according to claim 1, wherein the height of the partition plate is set according to demand. The drive unit according to claim 14 ,
The drive unit according to claim 1, wherein a height of the partition plate is within a diameter of the rotating body. The drive unit according to claim 14 or 15,
The drive unit according to claim 1, wherein a height of the partition plate is higher than an oil level when the rotating body is not rotated. The drive unit according to claim 14 or 15,
The drive unit according to claim 1, wherein a height of the partition plate is lower than an oil level when the rotating body is not rotated. The drive unit according to claim 14 or 15 ,
The drive unit according to claim 1, wherein the height of the partition plate is variable as required. The drive unit according to any one of claims 1 to 18,
The drive unit according to claim 1, wherein the height of the bottom of the first oil chamber and the height of the bottom of the second oil chamber are set as required. The drive unit according to claim 19 ,
The drive unit according to claim 1, wherein the height of the bottom of the second oil chamber is set higher than the height of the bottom of the first oil chamber. The drive unit according to claim 19 ,
The drive unit according to claim 1, wherein a height of a bottom of the first oil chamber is set higher than a height of a bottom of the second oil chamber. The drive unit according to any one of claims 1 to 21,
A drive unit comprising an oil return mechanism at an upper portion of the first oil chamber and / or the second oil chamber. The drive unit according to any one of claims 1 to 22,
An oil drain is provided in the second oil chamber. A housing for storing a predetermined amount of oil at the bottom;
A rotating body housed in the housing, partially immersed in the oil when not rotating, and scraping the oil when rotating;
A first oil chamber formed in the housing and surrounding a region where the rotating body is immersed;
A second oil chamber formed in the housing and formed outside the first oil chamber;
Oil scraping in which the first oil chamber communicates with the second oil chamber, and the flow rate per unit time flowing from the second oil chamber to the first oil chamber is swept up per unit time by the rotating body. A flow path set to be smaller than the amount;
With
The drive unit, wherein the first oil chamber and the second oil chamber are formed by partitions, and the height of the partitions is variable according to demand.

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