JP2006300101A - Lubricating device of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating device of a rotary electric machine capable of sufficiently feeding a lubricating oil to the downstream side of a lubricating oil path axially extending in a rotating portion. <P>SOLUTION: The lubricating device of the rotating electric machine comprises a rotor 130 fixed to a rotating shaft 110 having the axially extending oil path 113. The oil path 113 is enlarged to the downstream side of the oil path 113. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lubricating device for a rotating electrical machine, and more particularly to a lubricating device for a rotating electrical machine having a lubricating oil passage extending in the axial direction of a rotating portion.

  Conventionally, a lubricating device for a rotating electrical machine having a lubricating oil passage extending in the axial direction of a rotor is known. For example, Japanese Patent Application Laid-Open No. 10-278603 discloses a drive device for an electric vehicle using a shaft hole provided along a rotor shaft as a lubricating oil passage.

  Further, in Japanese Patent Laid-Open No. 7-317885, the lubricating oil is sent toward the nozzle hole by centrifugal force by making the oil supply passage leading to the nozzle hole into a tapered hole having an inner diameter that increases as the distance from the support plate increases. A rotation support device for a planetary gear is disclosed.

  Further, in Japanese Patent Application Laid-Open No. 2001-336617, a tapered circumferential surface having a gradually increasing inner diameter is formed from the opening side of the counter shaft oil passage toward the depth direction, and the centrifugal force generated by the rotation of the counter shaft is used. A lubricating structure for a transmission that feeds lubricating oil to a countershaft is disclosed.

Japanese Laid-Open Patent Publication No. 9-329220 discloses a lubricating device for a rotating shaft having an oil passage structure that gradually increases in diameter toward a bearing portion.
Japanese Patent Laid-Open No. 10-278603 JP 7-317885 A JP 2001-336617 A JP-A-9-329220

  However, in a rotating electrical machine having an oil passage structure as shown in Patent Document 1, when the length of the rotating shaft is long, the amount of lubricating oil is insufficient at the downstream end of the oil passage formed in the rotating shaft. There is. As a result, the lubricating oil may not be sufficiently supplied to a bearing or the like provided near the end of the rotating shaft.

  The present invention has been made in view of the above problems, and an object of the present invention is a rotating electrical machine in which lubricating oil is sufficiently supplied to a downstream side of a lubricating oil path extending in the axial direction of a rotating portion. It is to provide a lubricating device.

  A lubricating device for a rotating electrical machine according to the present invention includes a rotating portion having a lubricating oil passage extending in an axial direction. And the diameter of the lubricating oil passage increases toward the downstream side of the lubricating oil passage.

  According to the above configuration, since the lubricating oil can be sent to the downstream side of the lubricating oil path using the centrifugal force acting on the lubricating oil, the shortage of the lubricating oil is suppressed even when the shaft length of the rotating portion is long. Can do.

  In the above-described lubricating device for a rotating electrical machine, the lubricating oil is preferably supplied from the lubricating oil passage toward the lubricating portion, and the gradient of the diameter expansion changes in the axial direction of the rotating portion in accordance with the required lubricating oil flow rate in the lubricating portion. .

  According to the said structure, the magnitude of centrifugal force can be adjusted with the gradient of diameter expansion, and required lubricating oil can be supplied to each lubrication site | part.

  As an example, the lubricating device of the rotating electrical machine further includes a discharge oil passage that extends in the radial direction of the rotating portion and discharges the lubricating oil from the lubricating oil passage toward the lubricating portion. Here, the rotating portion has a first portion having a relatively large diameter gradient and a second portion adjacent to the first portion in the axial direction of the rotating portion and having a relatively small diameter gradient. The discharge oil passage is formed on the second portion.

  According to the above configuration, in the first part having a large diameter gradient, the centrifugal force is effectively used to send the lubricating oil to the downstream side of the lubricating oil passage, while in the second part having the small diameter gradient. By effectively utilizing the centrifugal force, the lubricating oil can be sent to the discharge oil passage and supplied to the lubricating portion.

  As another example, the lubricating device for the rotating electrical machine is formed in a plurality so as to be aligned in the axial direction of the rotating portion, extends in the radial direction of the rotating portion, and discharges the lubricating oil from the lubricating oil path toward the lubricating portion. A discharge oil passage is further provided. Here, the gradient of diameter expansion becomes smaller toward the downstream side of the lubricating oil passage.

  According to the above configuration, on the upstream side of the lubricating oil passage that is relatively easy to supply the lubricating oil, while the lubricating oil is sent to the downstream side of the lubricating oil passage by effectively using centrifugal force, the lubricating oil is relatively On the downstream side of the lubricating oil passage that is difficult to be supplied, the lubricating oil can be sent to the discharge oil passage and the lubricating oil can be supplied to the lubricating portion by effectively utilizing the centrifugal force.

  According to the present invention, the lubricating oil can be sufficiently supplied to the downstream side of the lubricating oil passage extending in the axial direction of the rotating portion.

  Embodiments of a lubricating device for a rotating electrical machine according to the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

(Embodiment 1)
1 is a diagram schematically showing an example of a structure of a drive unit including a lubricating device for a rotating electrical machine according to Embodiment 1. FIG. In the example shown in FIG. 1, the drive unit 1 is a drive unit mounted on a hybrid vehicle, and includes a motor generator 100, a housing 200, a speed reduction mechanism 300, a differential mechanism 400, and a drive shaft receiving portion 500. Consists of.

  The motor generator 100 is a rotating electric machine having a function as an electric motor or a generator. The motor generator 100 is a rotary shaft 110 that is rotatably attached to the housing 200 via a bearing 120, a rotor 130 that is attached to the rotary shaft 110, and a stator. 140. Here, rotating shaft 110 and rotor 130 constitute a “rotating portion” of motor generator 100.

  The rotating shaft 110 has a first shaft 111 to which the rotor 130 is attached and a second shaft 112 connected to the first shaft 111. The first and second shafts 111 and 112 are supported by bearings 120, respectively. The first and second shafts 111 and 112 are spline-fitted. Further, an oil passage 113 through which lubricating oil flows is formed at the axial centers of the first and second shafts 111 and 112.

  The rotor 130 includes a rotor core 131 and a magnet 132 embedded in the rotor core 131. The rotor core 131 is configured by laminating plate-like magnetic bodies such as iron or an iron alloy. For example, the magnets 132 are arranged in the vicinity of the outer periphery of the rotor core 131 at substantially equal intervals.

  The stator 140 includes a ring-shaped stator core 141, a coil 142 wound around the stator core 141, and a bus bar 143 connected to the coil 142. The bus bar 143 is connected to the power feeding cable 2 via a terminal block 600 provided in the housing 200. Thereby, the external power supply and the coil 142 are electrically connected.

  The stator core 141 is configured by laminating plate-like magnetic bodies such as iron or iron alloy. A plurality of teeth portions (not shown) and slot portions (not shown) as recesses formed between the teeth portions are formed on the inner peripheral surface of the stator core 141. The slot portion is provided so as to open to the inner peripheral side of the stator core 141.

  A coil 142 including three winding phases, ie, a U phase, a V phase, and a W phase, is wound around the teeth portion so as to fit into the slot portion. The U phase, the V phase, and the W phase of the coil 142 are wound so as to be shifted on the circumference. Bus bar 143 includes a U phase, a V phase, and a W phase corresponding to the U phase, V phase, and W phase of coil 142, respectively.

  The power feeding cable 2 is a three-phase cable including a U-phase cable, a V-phase cable, and a W-phase cable. The U-phase, V-phase, and W-phase of bus bar 143 are connected to the U-phase cable, V-phase cable, and W-phase cable in power feeding cable 2, respectively.

  The power output from the motor generator 100 is transmitted from the speed reduction mechanism 300 to the drive shaft receiving portion 500 via the differential mechanism 400. The driving force transmitted to the drive shaft receiving portion 500 is transmitted as a rotational force to a wheel (not shown) via a drive shaft (not shown), thereby causing the vehicle to travel.

  On the other hand, during regenerative braking of the hybrid vehicle, the wheels are rotated by the inertial force of the vehicle body. Motor generator 100 is driven via drive shaft receiving portion 500, differential mechanism 400 and reduction mechanism 300 by the rotational force from the wheels. At this time, the motor generator 100 operates as a generator. The electric power generated by the motor generator 100 is stored in the battery via the inverter.

  Lubrication of the bearing 120 that supports the rotating shaft 110 is performed using the lubricating oil that has been scraped up by the rotation of the ring gear of the differential mechanism 400. Arrows A, B, and C in FIG. 1 indicate the flow of the lubricating oil. The oil scraped up by the ring gear of the differential mechanism 400 is supplied to each bearing 120 while flowing mainly in the directions of arrows A, B, and C. Further, the lubricating oil cools the stator 140 and the like.

  As shown in FIG. 1, the oil passage 113 formed in the first shaft 111 is enlarged in diameter toward the downstream side of the oil passage 113. FIG. 2 is a diagram for explaining the force acting on the lubricating oil in the enlarged diameter portion of the oil passage 113. Referring to FIG. 2, centrifugal force F acts on lubricating oil 3 as rotor 130 rotates. The centrifugal force F is divided into a component F1 perpendicular to the wall surface of the oil passage 113 and a component F2 parallel to the wall surface of the oil passage 113. The parallel component F <b> 2 becomes a force that sends the lubricating oil 3 in the downstream direction of the oil passage 113. That is, as the rotor 130 rotates, the centrifugal force F promotes the conveyance of the lubricating oil 3 to the downstream side of the oil passage 113.

  FIG. 3 is a side sectional view showing the first shaft 111 in more detail. Referring to FIG. 3, the first shaft 111 supplies lubricating oil from the oil passage 113 to the outer peripheral surface of the first shaft 111. Discharge ports 114A to 114D as “discharge oil passages”. The discharge ports 114 </ b> A to 114 </ b> D are passages extending in the radial direction of the first shaft 111 and are provided so as to reach the oil passage 113 from the outer peripheral surface of the first shaft 111. During operation of the drive unit 1, the lubricating oil 3 that has flowed through the oil passage 113 and reached the discharge ports 114 </ b> A to 114 </ b> D flows into the discharge ports 114 </ b> A to 114 </ b> D by the action of the centrifugal force F, and reaches the outer periphery of the first shaft 111. Discharged. The discharged lubricating oil 3 is supplied to a bearing 120 provided on the outer periphery of the first shaft 111. Thereby, the bearing 120 is lubricated.

  In summary, the lubricating device for a rotating electrical machine according to the present embodiment includes a rotor 130 fixed to a rotating shaft 110 having an oil passage 113 extending in the axial direction, and the oil passage 113 includes the oil passage 113. The diameter is expanded toward the downstream side.

  In the drive unit 1, the lubricating oil 3 can be sent to the downstream side of the oil passage 113 using the centrifugal force F acting on the lubricating oil 3 as described above. Therefore, when the length of the rotating shaft 110 is long or when the vehicle turns, it is possible to suppress the occurrence of insufficient lubricating oil on the downstream side of the oil passage 113.

(Embodiment 2)
FIG. 4 is a side sectional view of first shaft 111 included in the rotating electrical machine lubrication device according to the second embodiment, and shows a section corresponding to FIG. 3 in the first embodiment. The lubricating device for a rotating electrical machine according to the present embodiment is a modification of the lubricating device for a rotating electrical machine according to the first embodiment, and basically has the same configuration as that of the first embodiment.

  Referring to FIG. 4, in the present embodiment, first shaft 111 has a steep slope portion 111 </ b> A having a relatively large diameter expansion gradient, and the diameter expansion does not change (that is, the diameter expansion gradient is relative). The horizontal portion 111B. The horizontal portion 111B is adjacent to the steep slope portion 111A in the axial direction of the first shaft 111. The discharge port 114C is formed on the horizontal portion 111B.

  Note that the steep slope portion 111A constitutes a “first portion”, and the horizontal portion 111B constitutes a “second portion”.

  According to the above configuration, in the steep slope portion 111A, the F2 component of the centrifugal force F that sends the lubricating oil 3 to the downstream side of the oil passage 113 is increased, so that the lubricating oil 3 is effectively utilized by utilizing the centrifugal force F. The oil can be sent to the downstream side of the oil passage 113. On the other hand, in the horizontal portion 111B, the lubricating oil can be sent to the discharge port 114C by effectively using the centrifugal force F.

  Therefore, the lubricating device according to the present embodiment is suitable, for example, when a relatively large amount of lubricating oil is required in the vicinity of discharge port 114C.

  In other words, in the present embodiment, the gradient of the diameter expansion is changed in the axial direction of the rotating shaft 110 in accordance with the required lubrication flow rate at the lubrication site. Thereby, the magnitude of the centrifugal force can be adjusted according to the gradient of the diameter expansion, and the necessary lubricating oil can be supplied to each lubrication site.

(Embodiment 3)
FIG. 5 is a side sectional view of first shaft 111 included in the rotating electrical machine lubrication device according to the third embodiment, and shows a section corresponding to FIG. 3 in the first embodiment. The lubricating device for a rotating electrical machine according to the present embodiment is a modification of the lubricating device for a rotating electrical machine according to the first embodiment, and basically has the same configuration as that of the first embodiment.

  Referring to FIG. 5, in the present embodiment, first shaft 111 includes a steep slope portion 111 </ b> A located on the upstream side of oil passage 113 and a gentle slope portion 111 </ b> C located on the downstream side of oil passage 113. Have. That is, in the present embodiment, the gradient of the diameter expansion of the oil passage 113 becomes smaller toward the downstream side of the oil passage 113.

  According to the above configuration, in the steep slope portion 111A, the F2 component of the centrifugal force F that sends the lubricating oil 3 to the downstream side of the oil passage 113 is increased, so that the lubricating oil 3 is effectively utilized by utilizing the centrifugal force F. The oil can be sent to the downstream side of the oil passage 113. On the other hand, in the gentle gradient portion 111B, the lubricating oil can be sent to the discharge ports 114C and 114D by effectively using the centrifugal force F. Therefore, on the upstream side of the oil passage 113 where the lubricating oil is relatively easily supplied, the lubricating oil 3 is relatively supplied while the lubricating oil 3 is sent to the downstream side of the oil passage 113 by effectively using the centrifugal force F. On the downstream side of the difficult oil passage 113, the lubricating oil 3 can be sent to the discharge ports 114 </ b> C and 114 </ b> D and the lubricating oil 3 can be supplied to the outer periphery of the first shaft 111 using the centrifugal force F effectively.

  Therefore, the lubricating device according to the present embodiment is suitable, for example, when a relatively large amount of lubricating oil is required in the vicinity of the discharge ports 114C and 114D. That is, also in the present embodiment, the gradient of the diameter expansion is changed in the axial direction of the rotating shaft 110 in accordance with the required lubrication flow rate at the lubrication site, as in the second embodiment.

  Although the embodiments of the present invention have been described above, it is planned from the beginning to appropriately combine the characteristic portions of the respective embodiments described above. For example, in the second embodiment, a “gradual gradient portion” may be provided instead of the “horizontal portion”, and in the third embodiment, a “horizontal portion” is provided instead of the “slow gradient portion”. Also good.

  Moreover, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is sectional drawing which showed the drive unit containing the lubricating device of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining the force which acts on lubricating oil in the lubricating device of the rotary electric machine shown by FIG. It is the sectional side view which showed the lubricating device of the rotary electric machine which concerns on Embodiment 1 of this invention. It is the sectional side view which showed the lubricating device of the rotary electric machine which concerns on Embodiment 2 of this invention. It is the sectional side view which showed the lubricating device of the rotary electric machine which concerns on Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Drive unit, 2 Power supply cable, 3 Lubricating oil, 100 Motor generator, 110 Rotation shaft, 111 1st shaft, 111A Steep slope part, 111B Horizontal part, 111C Slow slope part, 112 2nd shaft, 113 Oil path, 114A- 114D Discharge port, 120 Bearing, 130 Rotor, 131 Rotor core, 132 Magnet, 140 Stator, 141 Stator core, 142 Stator coil, 143 Busbar, 200 Housing, 300 Reduction mechanism, 400 Differential mechanism, 500 Drive shaft receiver

Claims (4)

A rotating portion having a lubricating oil passage extending in the axial direction;
The lubricating oil passage for a rotating electrical machine, wherein the lubricating oil passage has a diameter that increases toward the downstream side of the lubricating oil passage. Lubricating oil is supplied from the lubricating oil path toward the lubricating part,
2. The lubricating device for a rotating electrical machine according to claim 1, wherein a gradient of the diameter expansion changes in an axial direction of the rotating portion in accordance with a required lubricating oil flow rate in the lubricating portion. A discharge oil passage that extends in a radial direction of the rotating portion and discharges the lubricant from the lubricant passage toward the lubrication site;
The rotating portion includes a first portion having a relatively large diameter gradient and a second portion adjacent to the first portion in the axial direction of the rotating portion and having a relatively small diameter gradient. Have
The lubricating device for a rotating electrical machine according to claim 2, wherein the discharge oil passage is formed on the second portion. A plurality of discharge oil passages are formed so as to be aligned in the axial direction of the rotating portion, extend in the radial direction of the rotating portion, and discharge lubricating oil from the lubricating oil passage toward the lubricating portion,
The lubricating device for a rotating electrical machine according to claim 2, wherein the gradient of the diameter increase decreases toward the downstream side of the lubricating oil passage.

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