JP5728892B2 - motor - Google Patents

Description

  The present invention relates to a cooling structure for a motor, particularly a rotor.

  The motor includes a rotor having a rotor shaft (11), a rotor core (24), and a support member for connecting and supporting the rotor shaft (11) and the rotor core (24). The support member is an outer cylinder part (27) fixed to the inner peripheral surface of the rotor core (24), and a disk-like support body (25) that partitions the outer cylinder part (27) into two in the rotor shaft axial direction. ). In the motor having such a configuration, the technique disclosed in Patent Document 1 cools the permanent magnet embedded in the rotor core (24), and thus the inner peripheral surface (27c) of the outer cylinder portion on one side partitioned by the support (25). Oil is being supplied to

JP 2010-28979 A

  However, in the technique of the above-mentioned Patent Document 1, only the inner peripheral surface of the outer cylinder portion on one side partitioned by the support is cooled. That is, since the inner peripheral surface of the outer cylinder portion on the other side partitioned by the support is not cooled, the permanent magnet embedded in the rotor core cannot be sufficiently cooled, and the cooling performance is lowered.

  Then, an object of this invention is to provide the motor which can improve the cooling performance of the permanent magnet embedded in the rotor core.

The motor includes a rotor having a rotor shaft, a cylindrical rotor core that is located on the outer peripheral side of the rotor shaft and on which a permanent magnet is mounted, and a support member that connects and supports the rotor shaft and the rotor core. The support member includes an outer cylinder portion fixed to the inner peripheral surface of the rotor core and a disk-shaped support body that partitions the outer cylinder portion into two in the rotor shaft axial direction. The motor of the present invention discharges oil from a reduction gear disposed on the outer periphery of a rotor shaft on one side partitioned by a support, and an oil passage formed in the rotor shaft in the reduction gear. It has an oil supply means for supplying oil to the outer cylinder inner peripheral surface of the support side end surface speed reducer side after cooling and a through hole penetrating the support member to the mounting surface of the outer tubular portion of the support Yes. Furthermore, the inner diameter of the inner peripheral surface of the outer cylinder portion is decreased from both ends of the outer cylinder portion in the rotor shaft axial direction toward the inner side in the rotor shaft axial direction, and the portion of the inner cylinder surface of the outer cylindrical portion that has the smallest inner diameter in the rotor shaft axial direction The position is between the support and the support-side end surface of the speed reducer .

  According to the present invention, the oil can be supplied to the inner peripheral surface of the outer cylinder portion on the side where the oil is not supplied because it is partitioned by the support so as to be cooled through the through hole. The cooling performance of the permanent magnet can be improved.

3 is a schematic cross-sectional view of a motor of Comparative Example 1. FIG. It is the sectional view on the AA line of FIG. 6 is a schematic cross-sectional view of a motor of Comparative Example 2. FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3. 10 is a schematic cross-sectional view of a motor of Comparative Example 3. FIG. FIG. 6 is a partially enlarged view of FIG. 5. It is a schematic sectional drawing of the motor of 1st Embodiment of this invention . It is the sectional view on the AA line of FIG. It is a schematic sectional drawing of the motor of 2nd Embodiment. FIG. 10 is an enlarged view of a portion circled in FIG. 9. It is A arrow directional view and B arrow directional view of FIG. It is a schematic sectional drawing of the motor of 3rd Embodiment. FIG. 13 is a partially enlarged view of FIG. 12. It is an expanded view along the through-hole of 3rd Embodiment. It is a schematic sectional drawing of the motor of 4th Embodiment. FIG. 13 is a partially enlarged view of FIG. 12. It is an expanded view along the through-hole of 4th Embodiment. It is a schematic sectional drawing of the motor of 5th Embodiment. FIG. 13 is a partially enlarged view of FIG. 12. It is an expanded view along the through-hole of 5th Embodiment. It is a schematic sectional drawing of the motor of 6th Embodiment. It is AA sectional view taken on the line of FIG. It is a schematic sectional drawing of the motor of 7th Embodiment. It is AA sectional view taken on the line of FIG. It is explanatory drawing of the attachment surface to the spider outer cylinder part of a spider support body.

  Embodiments of the present invention will be described below with reference to the drawings.

( Comparative Example 1 )
FIG. 1 is a schematic cross-sectional view of a motor 1 of Comparative Example 1 for one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. However, only the spider 21 is shown in FIG.

  In FIG. 1, the motor case 2 includes left and right ring-shaped end plates 2a and 2b, and a cylindrical housing 2c fixed to the outer peripheral portion of each end plate 2a and 2b. The rotor shaft 12 and the speed reducer shaft 6 running in the left-right direction are rotatably supported by two bearings 3, 4 provided on the inner peripheral surfaces of the left and right ring-shaped end plates 2a, 2b. Further, the rotor shaft 12 and the speed reducer shaft 6 are arranged coaxially, and both are connected via the speed reducer 5.

  The speed reducer 5 is composed of a planetary gear device that adjusts (increases) the driving force of the rotor shaft 12 and transmits it to the speed reducer shaft 6. This planetary gear device includes a pinion gear 7 fixed to the outer periphery 13 of the rotor shaft 12.

  An annular stator core 9 formed by laminating a number of silicon steel plates is fixed to the inner wall of the housing 2c. The stator core 9 is provided with a coil 10. A stator 8 is configured by the stator core 9 and the coil 10.

  Inside the stator 8, the rotor 11 including the rotor shaft 12, the spider 21, and the rotor core 31 is disposed with a predetermined gap from the inner periphery of the stator 8. That is, a spider 21 as a rotor core support member is fitted and fixed to the outer periphery 13 of the rotor shaft 12 that extends in the left-right direction in FIG. 1, and a plurality of silicon steel plates, for example, are laminated on the outer periphery of the spider 21. The annular rotor core 31 is fixedly fitted.

  A permanent magnet (see FIG. 22), which is a magnetized member, is embedded in the rotor core 31 on the outer peripheral side in the radial direction of the rotor shaft 12, and is not shown at the end in the axial direction (left-right direction) of the rotor shaft 12. It has an end plate.

  The spider 21 made of a magnetic material such as iron includes a cylindrical spider outer cylinder portion 22 that is inserted into and fixed to the inner periphery 31 a of the rotor core 31, and the spider outer cylinder portion 22 is connected to the axis of the rotor shaft 12. It consists of a disc-like spider support 23 that is divided into two in the direction.

  In the rotor shaft 12, an axial oil passage 14 to which cooling oil is supplied and a radial oil passage that opens from the oil passage 14 in the radial direction of the rotor shaft 12 to the outer periphery 13 of the rotor shaft 12. 15 is formed. The pinion gear 7 constituting the speed reducer 5 is opposed to the opening end 15 a of the radial oil flow path 15. For this reason, the oil from the oil pump provided outside the motor case 2 is supplied to the pinion gear 7 through the oil passages 14 and 15 provided in the rotor shaft 12, and the speed reducer 5 including the pinion gear 7 is provided. It will be lubricated. That is, the oil supply means is constituted by the oil pump and the oil passages 14 and 15.

  Now, the permanent magnet embedded in the rotor core 31 generates heat. In order to cool the heat generating permanent magnet with oil after lubricating the speed reducer 5, the oil after lubricating the pinion gear 7 is rotated by the centrifugal force of the spider outer cylinder portion 22 when the rotor shaft 12 is rotating. It is injected (supplied) to the inner peripheral surface or the side surface 23a of the spider support 23 on the speed reducer 5 side.

  However, the thickness of the spider support 23 in the axial direction of the rotor shaft 12 is made thinner than the thickness of the spider outer cylindrical portion 22 in the axial direction of the rotor shaft 12, and the spider outer cylindrical portion 22 is substantially at the center in the axial direction of the rotor shaft 12. A spider support 23 is disposed on the surface. In addition, no hole is provided in the entire side surface of the support 23. That is, the oil from the speed reducer 5 is blocked by the spider support 23. For this reason, the oil from the speed reducer 5 is supplied to the inner peripheral surface of the spider outer cylinder portion on the side of the speed reducer 5 (hereinafter, the inner peripheral surface of the spider outer cylinder portion on the side of the speed reducer 5 will be referred to as the “reducer side inner peripheral surface”). .) 22a only, the inner peripheral surface of the spider outer cylinder portion on the opposite side to the speed reducer 5 (hereinafter, the inner peripheral surface of the spider outer cylinder portion on the opposite side to the speed reducer 5 is hereinafter referred to as “the inner peripheral surface opposite to the speed reducer”) 22b. No oil is supplied to the tank. Note that the inner diameter of the reduction gear side inner circumferential surface 22a is the same as the inner diameter of the reduction gear opposite inner circumferential surface 22b.

Therefore, in Comparative Example 1 , since oil from the speed reducer 5 is also supplied to the inner peripheral surface 22b on the opposite side of the speed reducer, the spider support 23 is attached directly to the spider outer cylinder portion 22 through the spider support 23. A tubular through hole 24 is provided. As shown in FIG. 2, six through holes 24 are provided at equal intervals in the circumferential direction of the rotor shaft 12. The cross section of the through hole 24 is circular, but is not limited thereto.

  Here, the attachment surface of the spider support 23 to the spider outer cylinder portion 22 is a horizontal direction between the spider support 23 and the spider outer cylinder portion 22 as shown in the model of FIG. When a boundary surface (refer to the alternate long and short dash line) is assumed, this boundary surface is a mounting surface of the spider support 23 to the spider outer cylinder portion 22. In this case, the horizontal boundary surface is a line of intersection (curve) between the speed reducer side surface 23a of the spider support 23 and the speed reducer side inner peripheral surface 22a, and the speed reducer opposite side surface 23b of the spider support 23 and the speed reducer. It is a curved surface formed by connecting a line of intersection (curve) with the opposite inner peripheral surface 22b.

  When the inner diameters of both the speed reducer side inner peripheral surface 22a and the speed reducer opposite side inner peripheral surface 22b are the same, the through hole 24 is formed in the axial direction of the rotor shaft 12. Therefore, both the speed reducer side opening 24a and the speed reducer opposite side opening 24b of the through hole 24 are opened in the axial direction of the rotor shaft 12 (left and right direction in FIG. 1).

Here, the effect of the comparative example 1 is demonstrated.

In Comparative Example 1 , the speed reducer 5 is lubricated and then blown off by centrifugal force to collide with the speed reducer side surface 23a and the speed reducer side inner peripheral surface 22a of the spider support 23. In particular, the oil colliding with the speed reducer side surface 23a of the spider support 23 flows on the surface of the speed reducer side surface 23a to the outer side in the radial direction of the rotor shaft 12, hits the transmission side inner peripheral surface 22a, and An axial flow occurs. The axial flow of the rotor shaft 12 is divided into a flow that flows to the speed reducer 5 side and a flow that flows to the side opposite to the speed reducer 5. Among these, the flow flowing on the side opposite to the speed reducer 5 passes through the through-hole 24 and reaches the speed reducer opposite inner peripheral surface 22b and flows to the entire speed reducer opposite side inner peripheral surface 22b. That is, oil can be supplied to the inner peripheral surface 22b on the opposite side of the speed reducer, which is the inner peripheral surface of the outer cylinder portion beyond the spider support 23, through the through hole.

As described above, in the first comparative example , the rotor shaft 12, the cylindrical rotor core 31 that is located on the outer peripheral side of the rotor shaft 12 and on which the permanent magnet is mounted, and the spider that connects and supports the rotor shaft 12 and the rotor core 31. In the motor 1 including the rotor 11 having 21 (support member), the spider 21 includes a spider outer cylinder portion 22 (outer cylinder portion) fixed to the inner peripheral surface of the rotor core 31 and the spider outer cylinder portion 22 as a rotor. It consists of a disc-shaped spider support 23 (support) that divides into two in the axial direction of the shaft 12, and a speed reducer side inner peripheral surface 22 a (an inner peripheral surface of the outer cylinder portion on one side partitioned by the spider support 23). Oil supply means (14, 15) for supplying oil to the spider support 23, and the spider support 23 penetrates the attachment surface of the spider support 23 to the spider outer cylinder 22. A through hole 24 which is provided. According to this, oil can be supplied also to the inner peripheral surface 22b on the side opposite to the speed reducer, which is the side where the oil is not supplied because it is partitioned by the spider support 23. . With the oil supplied to the inner peripheral surface 22b on the speed reducer opposite side, the rotor core 31 on the side opposite the speed reducer, which is at a high temperature due to the heat generated by the permanent magnet, can be cooled (the cooling performance of the permanent magnet can be improved).

Further, in Comparative Example 1 , the speed reducer 5 that decelerates and removes the rotational speed of the rotor shaft 12 is coaxial with the rotor shaft 12, and at least a part of the speed reducer 5 is provided on the inner peripheral side of the rotor core 12. The oil supplied by the supply means is the oil after lubricating the speed reducer 5. After the speed reducer 5 is lubricated, it is blown off by centrifugal force and collides with the spider support 23, and the oil flowing on the surface of the spider support 23 outward in the radial direction of the rotor shaft 12 enters the spider outer cylinder portion 22 of the spider support 23. The rotor shaft 12 flows in the axial direction against the mounting surface of the rotor shaft 12. The flow in the axial direction of the rotor shaft 12 is divided into a flow that flows toward the speed reducer 5 and a flow that flows on the opposite side of the speed reducer 5. The flow that flows on the opposite side of the speed reducer 5 passes through the through hole 24. The oil can also be supplied to the inner peripheral surface 22b of the outer cylinder part beyond the spider support 23.

( Comparative Example 2 )
3 is a schematic cross-sectional view of the motor 1 of Comparative Example 2 , and FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, which replaces FIGS. 1 and 2 of Comparative Example 1 . The same parts as those in FIGS. 1 and 2 of the comparative example 1 are denoted by the same reference numerals. However, only the spider 21 is shown in FIG.

In Comparative Example 2 , the speed reducer-side inner circumference 22a and the speed reducer-opposite inner peripheral face 22b partitioned by the spider support 23 are smaller than the inner diameter D1 of the speed reducer-side inner peripheral face 22a. The inner diameter D2 of the surface 22b is increased, and a straight tubular through hole 25 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22. As shown in FIG. 4, six through holes 25 are provided at equal intervals in the circumferential direction of the rotor shaft 12.

  When the inner diameter D2 of the inner peripheral surface 22b on the opposite side of the reduction gear is larger than the inner diameter D1 of the inner peripheral surface 22a of the speed reducer, the spider support 23 and the spider outer cylinder portion 22 are shown as a model in FIG. An oblique boundary surface (see the alternate long and short dash line) can be assumed between the two and the boundary surface, and this boundary surface is an attachment surface of the spider support 23 to the spider outer cylinder portion 22. In this case, the boundary surface in the oblique direction is an intersection (curve) between the speed reducer side surface 23a of the spider support 23 and the speed reducer side inner peripheral surface 22a, and the speed reducer opposite side surface 23b of the spider support 23 and the speed reducer. It is a curved surface formed by connecting a line of intersection (curve) with the opposite inner peripheral surface 22b.

  When the inner diameter D2 of the speed reducer-side inner peripheral surface 22b is larger than the inner diameter D1 of the speed reducer-side inner peripheral surface 22a, the center line C of the through hole 25 is the radial direction of the rotor shaft 12 (vertical direction in FIG. 3). With a predetermined angle α (0 ° <α <90 °). Both the speed reducer side opening 25a and the speed reducer opposite side opening 25b of the through hole 25 are opened in the axial direction of the rotor shaft 12 (left and right direction in FIG. 3).

The oil that collides with the speed reducer side surface 23 a of the spider support 23, flows on the surface of the speed reducer side surface 23 a radially outward of the rotor shaft 12, and hits the transmission side inner peripheral surface 22 a is the axis of the rotor shaft 12. Flow in the direction. The flow in the axial direction of the rotor shaft 12 is divided into a flow that flows toward the speed reducer 5 and a flow that flows toward the opposite side of the speed reducer 5. In Comparative Example 2 , the through hole 25 is formed on the rotor shaft from the speed reducer side opening 25a. 12 are inclined toward the outside in the radial direction. As a result, more oil flows on the side opposite to the speed reducer 5 than oil flows on the side of the speed reducer 5, and the amount of oil supplied to the inner peripheral surface 22b on the side opposite to the speed reducer increases compared to the case of the first comparative example .

As described above, according to Comparative Example 2 , the speed reducer side inner periphery 22a and the speed reducer opposite side inner peripheral surface 22b (the two outer cylinder part inner peripheral surfaces partitioned by the support 23) are included. The inner peripheral surface 22b (the other side opposite to the one side partitioned by the support) on the other side than the inner diameter D1 of the surface 22a (the inner peripheral surface of the outer cylinder part on one side partitioned by the support) Since the inner surface D2 of the outer cylinder portion (inner peripheral surface) is increased and the through hole 25 penetrating the spider support body 23 is provided on the attachment surface of the spider support body 23 to the spider outer cylinder portion 22, the inner peripheral surface on the opposite side of the speed reducer The amount of oil supplied to 22b can be increased from that in Comparative Example 1 .

( Comparative Example 3 )
5 is a schematic cross-sectional view of the motor 1 of Comparative Example 3 , FIG. 6A is an enlarged view of a portion surrounded by a circle (see the broken line) in FIG. 5, and FIG. 6B is an A- in FIG. It is A sectional view. The same parts as those in FIGS. 1 and 2 of the comparative example 1 are denoted by the same reference numerals.

In Comparative Example 2, the speed reducer side opening 25a of the through hole 25 opens in the axial direction of the rotor shaft 12 (rightward in FIG. 3). In contrast, in Comparative Example 3, the speed reducer side opening 26a of the through hole 26 opens toward the radially inner side (vertical direction in FIG. 5) of the rotor shaft 12 as shown in FIG. It is a thing. For this reason, the speed reducer side opening portion 26 a of the through hole 26 is opened at the tip of the oil flowing through the speed reducer side wall 23 a of the spider support 23 toward the radially outer side of the rotor shaft 12. Thus, when the speed reducer side opening 26a of the through hole 26 is opened toward the radially inner side of the rotor shaft 12 (vertical direction in FIG. 5), the speed reducer side side wall 23a is formed in the radial direction of the rotor shaft 12. Almost all of the oil flowing toward the outside is supplied to the speed reducer side opening 26a of the through hole 26 (see the arrow in FIG. 6A).

Except that the speed reducer side opening 26a is different from the Comparative Example 2 is a configuration similar to Comparative Example 2. That is, of the speed reducer-side inner peripheral surface 22b and the speed reducer-side inner peripheral surface 22b of the speed reducer-side inner peripheral surface 22b divided by the spider support 23, the speed reducer-side inner peripheral surface 22b is smaller than the inner diameter D1. In addition to increasing the inner diameter D2 ′, a straight tubular through hole 26 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder 22. Six through holes 26 are provided at equal intervals in the circumferential direction of the rotor shaft 12.

  Since the inner diameter D2 ′ of the inner peripheral surface 22b opposite to the reduction gear is larger than the inner diameter D1 of the inner peripheral surface 22a of the speed reducer, the center line C of the through hole 26 is in the radial direction of the rotor shaft 12 (vertical direction in FIG. 5). On the other hand, it has a predetermined angle α (0 ° <α <90 °). An opening 26b opposite to the reduction gear of the through hole 26 opens in the axial direction of the rotor shaft 12 (leftward in FIG. 5).

According to the comparative example 3 , the speed reducer side inner surface 22a and the speed reducer opposite side inner peripheral surface 22b partitioned by the spider support 23 are on the side opposite the speed reducer than the inner diameter D1 of the speed reducer side inner peripheral surface 22a. While increasing the inner diameter D2 ′ of the inner peripheral surface 22b, a through hole 26 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22, and the speed reducer side opening of the through hole 26 is provided. Since the portion 26a opens toward the radially inner side of the rotor shaft 12, the flow rate of oil supplied to the inner peripheral surface 22b on the speed reducer opposite side can be increased as compared with the case of the second comparative example .

(First Embodiment)
Figure 7 is a schematic sectional view of a motor 1 of the first embodiment of the present invention, FIG 8 is a sectional view taken along line A-A of FIG. 7, FIG. 1 of Comparative Example 1, but replacing the 2. The same parts as those in FIGS. 1 and 2 of the comparative example 1 are denoted by the same reference numerals. However, only the spider 21 is shown in FIG.

In the first embodiment, the inner diameter of the inner peripheral surface 22 of the spider outer cylinder portion is made smaller from both ends of the spider outer cylinder portion 22 in the axial direction of the rotor shaft 12 toward the inner side in the axial direction of the rotor shaft 12, and the inner peripheral surface of the spider outer cylinder portion The position of the rotor shaft 12 in the axial direction of the portion where the inner diameter of 22 is the smallest is arranged on the speed reducer 5 side of the spider support 23.

  Here, the spider outer cylinder part 22 is divided into two parts 41 and 42 in the axial direction of the rotor shaft 12 (left and right in FIG. 7), and the part 41 on the reduction gear side is the “first spider outer cylinder part”, opposite to the reduction gear. The side portion 42 is assumed to be treated as a “second spider outer cylinder”. Among these, the inner diameter of the inner peripheral surface 41a of the first spider outer cylinder portion 41 is smaller than the speed reducer side end 41b (right end in FIG. 7) in the axial direction of the rotor shaft 12 (on the opposite side of the speed reducer in the axial direction of the rotor shaft 12). It is formed so as to become smaller toward the left in FIG. On the other hand, the inner diameter of the inner peripheral surface 42a of the second spider outer cylinder portion 42 is smaller than the speed reducer opposite end 42b (left end in FIG. 7) in the axial direction of the rotor shaft 12 (FIG. 7). And to the right) In this case, the axial position of the rotor shaft 12 where the inner diameter of the inner peripheral surface 22 (41a, 42a) of the spider is the minimum diameter Dmin is positioned closer to the speed reducer 5 than the spider support 23. . For this reason, the rotor shaft 12 axial width of the inner peripheral surface 42a of the second spider outer cylindrical portion 42 is larger than the width of the inner peripheral surface 41a of the first spider outer cylindrical portion 41 in the axial direction of the rotor shaft 12.

  As described above, when the first and second spider outer cylinder portions 41 and 42 are formed, the spider support 23 is connected to the second spider outer cylinder portion 41. Here, the second spider outer cylinder inner peripheral surface 42a on the speed reducer 5 side partitioned by the spider support 23 is referred to as a “speed reducer inner peripheral surface 42aa”, and the second spider outer peripheral surface 42a on the opposite side of the speed reducer 5 partitioned by the spider support 23 is used. 2 Spider outer cylinder part inner peripheral surface 42a is distinguished as "reduction gear opposite side inner peripheral surface 42ab".

  And the spider support body 23 penetrates the attachment surface to the spider outer cylinder part 22 (41, 42) of the spider support body 23 with respect to the spider outer cylinder part 22 (41, 42) formed in this way. A straight tubular through hole 27 is provided. As shown in FIG. 8, six through holes 27 are provided at equal intervals in the circumferential direction.

  Since the inner diameter of the speed reducer-side inner peripheral surface 42ab is larger than the inner diameter of the speed reducer-side inner peripheral surface 42aa, the center line C of the through-hole 27 is predetermined with respect to the radial direction of the rotor shaft 12 (vertical direction in FIG. 7). It has an angle β (0 ° <β <90 °). Both the speed reducer side opening 27a and the speed reducer opposite side opening 27b of the through hole 27 are opened in the axial direction of the rotor shaft 12 (left and right direction in FIG. 7).

  If the speed reducer side inner peripheral surface 42aa is inclined outward in the radial direction of the rotor shaft 12 toward the opposite side of the speed reducer, the speed reducer 5 is lubricated and then blown off by centrifugal force to the speed reducer side inner peripheral surface 42aa. Almost all of the collided oil is supplied to the speed reducer side opening 27 a of the through hole 27. Further, almost all of the oil that collides with the speed reducer side wall 23 a of the spider support 23 and flows on the surface of the speed reducer side wall 23 a toward the radially outer side of the rotor shaft 12 is also the speed reducer side opening 27 a of the through hole 27. Will be supplied.

In the first embodiment, the amount of oil supplied to the inner peripheral surface 42ab on the opposite side of the speed reducer as the axial position of the rotor shaft 12 at the portion where the inner diameter of the inner peripheral surface of the spider outer cylindrical portion is the smallest is closer to the speed reducer 5 side. Will increase. Further, as the minimum diameter Dmin of the inner peripheral surface of the spider outer cylinder part is increased, the amount of oil supplied to the inner peripheral surface 42ab on the opposite side of the speed reducer is increased. That is, the amount of oil supplied to the inner peripheral surface 42ab on the side opposite to the speed reducer by the axial position of the rotor shaft 12 at the portion where the inner diameter of the inner peripheral surface of the spider outer cylinder portion is the minimum and the minimum diameter Dmin of the inner peripheral surface of the spider outer cylinder portion. Can be adjusted.

According to the first embodiment, the inner diameter of the inner peripheral surface of the spider outer cylinder portion is reduced from the both ends 41b and 42b of the spider outer cylinder portion 22 in the axial direction of the rotor shaft 12 toward the inner side in the axial direction of the rotor shaft 12, and The axial direction position of the rotor shaft 12 in the portion where the inner diameter of the cylindrical inner peripheral surface is the minimum is positioned closer to the speed reducer 5 (one side partitioned by the support) than the spider support 23 and the spider support 23 Since the through-hole 27 that penetrates the spider support 23 is provided on the attachment surface to the spider outer cylinder portion 22 (41, 42), the flow rate of oil supplied to the inner peripheral surface 22b on the speed reducer opposite side as compared with the case of Comparative Example 2 is reduced. Can do a lot.

( Second Embodiment)
9 is a schematic cross-sectional view of the motor 1 according to the second embodiment, FIG. 10 is an enlarged view of a portion surrounded by a circle (see broken line) in FIG. 9, and FIG. 11 (a) is a view taken in the direction of arrow A in FIG. (B) is a B arrow view of FIG. The same parts as those in FIGS. 3 and 4 of the comparative example 2 are denoted by the same reference numerals. However, only the spider 21 is shown in FIGS.

2nd Embodiment presupposes the comparative example 2 shown in FIG. 3, FIG. 4, and the shape of the reduction gear side opening part 28a of the through-hole 28 and the reduction gear opposite side opening part 28b of the through hole 28 is different in both. The outlet shape of the opening 28b on the opposite side of the speed reducer is made into a trumpet shape. That is, as shown in FIGS. 10A and 10B, the rotor shaft 12 circumferential width Wr <b> 2 of the opening 28 b on the opposite side of the speed reducer of the through hole 28 is set to the rotor of the speed reducer side opening 28 a of the through hole 28. The shaft 12 is made larger than the circumferential width Wr1. The rotor shaft 12 radial width Wd2 of the through hole 28 on the speed reducer opposite side opening 28b is relatively smaller than the rotor shaft 12 radial width Wd1 of the speed reducer side opening 28a of the through hole 28.

Except that the speed reducer side opening 28a, the speed reducer opposite the opening 28b different from the Comparative Example 2 has the same configuration as Comparative Example 2. That is, of the speed reducer-side inner peripheral surface 22b and the speed reducer-side inner peripheral surface 22b of the speed reducer-side inner peripheral surface 22b divided by the spider support 23, the speed reducer-side inner peripheral surface 22b is smaller than the inner diameter D1. While increasing the inner diameter D2, a straight tubular through hole 28 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder 22. Six through holes 28 are provided at equal intervals in the circumferential direction of the rotor shaft 12.

  Since the inner diameter D2 of the inner peripheral surface 22b opposite to the speed reducer is larger than the inner diameter D1 of the inner peripheral surface 22a of the speed reducer, the center line C of the through hole 28 is relative to the radial direction of the rotor shaft 12 (vertical direction in FIG. 9). It has a predetermined angle α (0 ° <α <90 °). Both the speed reducer side opening 28a and the speed reducer opposite side opening 28b of the through hole 28 are opened in the axial direction of the rotor shaft 12 (left and right direction in FIG. 9).

As described above, according to the second embodiment, the speed reducer side inner peripheral surface 22a and the speed reducer opposite side inner peripheral surface 22b (the two outer cylindrical portion inner peripheral surfaces partitioned by the support body) Inner diameter D2 of the inner peripheral surface 22b (the inner peripheral surface on the other side opposite to the one side) than the inner diameter D1 of the peripheral surface 22a (the outer peripheral surface on one side). And a through hole 28 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder 22, and an opening 28 b (on one side of the through hole 28 opposite to the speed reducer). (The opening to the other side that is the opposite side) is longer in the circumferential direction of the rotor shaft 12 than the speed reducer side opening 28a (the opening to one side) of the through hole 28, and the radial direction of the rotor shaft 12 To make it shorter. By the outlet shape of the speed reducer opposite the opening 28b in a trumpet-like, oil flows out to the reducer opposite the peripheral surface 22b from the speed reducer opposite the opening 28b is, Comparative Example to the reducer opposite the inner peripheral surface 22b It spreads larger than the case of 2 . The oil comes into contact with the wide range of the inner peripheral surface 22b on the opposite side of the speed reducer, and the cooling performance of the permanent magnet can be improved.

( Third embodiment)
12 is a schematic cross-sectional view of the motor 1 of the third embodiment, FIG. 13A is an enlarged view of a portion surrounded by a circle (see the broken line) in FIG. 12, and FIG. 13B is A in FIG. FIG. FIG. 14 is a development view developed along the BB line in FIGS. 13A and 13B, that is, along the through hole 29. The same parts as those in FIGS. 5 and 6 of the comparative example 3 are denoted by the same reference numerals.

In the third embodiment, on the premise of Comparative Example 3 , the speed reducer side opening 29a of the through hole 29 and the speed reducer opposite side opening 29b of the through hole 29 are arranged in the circumferential direction of the rotor shaft 12 (vertical direction in FIG. 14). It is provided at a position shifted to. Therefore, as shown in FIG. 14, the central axis C of the through hole 29 has a predetermined angle θ (0 ° <θ <90 °) with respect to the circumferential direction of the rotor shaft 12. For comparison, in FIG. 14, the through hole 26 of Comparative Example 3 is shown by being overlapped with a broken line. In Comparative Example 3 , the central axis of the through hole 26 has an angle of 90 ° with respect to the circumferential direction of the rotor shaft 12.

Opening 29a of the through hole 29, except that the position of 29b is different from the Comparative Example 3 is a configuration similar to that of Comparative Example 3. That is, of the speed reducer-side inner peripheral surface 22b and the speed reducer-side inner peripheral surface 22b of the speed reducer-side inner peripheral surface 22b divided by the spider support 23, the speed reducer-side inner peripheral surface 22b is smaller than the inner diameter D1. While increasing the inner diameter D2 ′, a straight tubular through hole 29 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder 22. Six through holes 29 are provided at equal intervals in the circumferential direction of the rotor shaft 12.

  Since the inner diameter D2 ′ of the inner peripheral surface 22b on the opposite side of the speed reducer is larger than the inner diameter D1 of the inner peripheral surface 22a of the speed reducer, the center line C of the through hole 29 is in the radial direction of the rotor shaft 12 (vertical direction in FIG. 12). On the other hand, it has a predetermined angle α (0 ° <α <90 °). The speed reducer side opening 29a of the through hole 29 opens radially inward of the rotor shaft 12 (vertical direction in FIG. 12), and the speed reducer opposite side opening 29b of the through hole 29 is in the axial direction of the rotor shaft 12 (FIG. 12). It opens to the left).

According to the third embodiment, of the speed reducer side inner peripheral surface 22a and the speed reducer opposite inner peripheral surface 22b partitioned by the spider support 23, the speed reducer is opposite to the inner diameter D1 of the speed reducer inner peripheral surface 22a. The inner diameter D2 ′ of the side inner peripheral surface 22b is increased, and a through hole 29 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22, and the speed reducer side of the through hole 29 is provided. The opening 29a opens toward the radially inner side of the rotor shaft 12, and the opening 29b (opening to the other side opposite to the one side of the through hole) of the through hole 29 is provided. Part) and the speed reducer opposite side opening 29a (opening to one side of the through hole) are provided at positions shifted in the circumferential direction of the rotor shaft 12. Thereby, since friction when oil enters the through hole 29 can be reduced, the oil can easily enter the through hole 29, and the amount of oil supplied to the inner peripheral surface 22 b on the speed reducer opposite side is smaller than that in the case of Comparative Example 3 . Can be increased.

( Fourth embodiment)
15 is a schematic cross-sectional view of the motor 1 of the fourth embodiment, FIG. 16A is an enlarged view of a portion surrounded by a circle (see the broken line) in FIG. 15, and FIG. 16B is A in FIG. FIG. FIG. 17 is a development view developed along the line BB in FIGS. 16A and 16B, that is, along the through hole 30. The same parts as those in FIGS. 5 and 6 of the comparative example 3 are denoted by the same reference numerals.

In the fourth embodiment, on the premise of Comparative Example 3 , as shown in FIG. 17, the first through hole 45 on one side of the through hole 30 is the second on the other side opposite to the one side. The angle θ1 (0 ° <θ1 <90 °) formed by the center line C1 of the first through hole 45 with respect to the circumferential direction of the rotor shaft 12 is the center of the second through hole 46. The line C2 is smaller than an angle θ2 (0 ° <θ2 <90 °) formed with respect to the circumferential direction of the rotor shaft 12.

The configuration of the through hole 30 is the same as that of the comparative example 3 except that the position of the through hole 30 is different from that of the comparative example 3 . That is, of the speed reducer-side inner peripheral surface 22b and the speed reducer-side inner peripheral surface 22b of the speed reducer-side inner peripheral surface 22b divided by the spider support 23, the speed reducer-side inner peripheral surface 22b is smaller than the inner diameter D1. While increasing the inner diameter D2 ′, a straight tubular through hole 30 (45, 46) penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22. In the circumferential direction of the rotor shaft 12, six through holes 30 (45, 46) are provided at equal intervals.

  Since the inner diameter D2 ′ of the inner peripheral surface 22b opposite to the speed reducer is larger than the inner diameter D1 of the inner peripheral surface 22a of the speed reducer, the center lines C1 and C2 of the first and second through holes 45 and 46 are It has a predetermined angle α (0 ° <α <90 °) with respect to the radial direction (vertical direction in FIG. 15). The speed reducer side opening 30a of the through hole 30 (first through hole 45) opens radially inward (vertical direction in FIG. 15) of the rotor shaft 12, and is opposite to the speed reducer of the through hole 30 (second through hole 46). The side opening 30b opens in the axial direction of the rotor shaft 12 (leftward in FIG. 15).

According to the fourth embodiment, among the speed reducer side inner peripheral surface 22a and the speed reducer opposite inner peripheral surface 22b partitioned by the spider support 23, the speed reducer is opposite to the inner diameter D1 of the speed reducer inner peripheral surface 22a. The inner diameter D2 ′ of the side inner peripheral surface 22b is increased, and a through hole 30 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22, and the speed reducer side of the through hole 30 is provided. The opening 30a opens toward the radially inner side of the rotor shaft 12, and the first through hole 45 on one side and the second through on the other side opposite to the one side. The center line C1 of the first through hole 45 forms an angle θ1 with respect to the circumferential direction of the rotor shaft 12, and the center line C2 of the second through hole 46 extends in the circumferential direction of the rotor shaft 12. Smaller than the angle θ2 And comb. Accordingly, the angle θ1 formed by the center line C1 of the first through hole 45 with respect to the circumferential direction of the rotor shaft 12 is the center line C of the through hole 29 formed with respect to the circumferential direction of the rotor shaft 12 in the third embodiment. It becomes smaller than the angle θ. Thus, when the angle θ1 formed with respect to the circumferential direction of the rotor shaft 12 is smaller than that in the third embodiment, the oil is likely to enter the first through hole 45 (through hole 30), and the inner circumference on the opposite side of the speed reducer accordingly. The amount of oil supplied to the surface 22b can be increased as compared with the third embodiment.

Further, in the third embodiment, providing the speed reducer opposite side opening 29b and the speed reducer opposite side opening 29a of the through hole 29 at positions shifted in the circumferential direction of the rotor shaft 12 is the length of the through hole 29. Means longer than the through hole 26 of Comparative Example 3 (see FIG. 14). For this reason, regarding the point which processes a through-hole, the direction of 3rd Embodiment becomes disadvantageous rather than the comparative example 3. FIG . On the other hand, according to the fourth embodiment, since the through hole is composed of two bent through holes 45, 46, the length of each through hole 45, 46 is shorter than the through hole 29 of the third embodiment. Thereby, the difficulty of processing due to the long through hole can be prevented.

( Fifth embodiment)
18 is a schematic cross-sectional view of the motor 1 of the fifth embodiment, FIG. 19A is an enlarged view of a portion surrounded by a circle (see the broken line) in FIG. 18, and FIG. 19B is A in FIG. FIG. FIG. 20 is a development view developed along the line BB in FIGS. 19A and 19B, that is, along the through hole 29. Parts identical to those in FIGS. 12, 13 (a), (b) and FIG. 14 of the third embodiment are given the same numbers.

The fifth embodiment is shown in FIG. 20 in the vicinity of the speed reducer opposite side opening 39a of the through hole 29 on the premise of the third embodiment shown in FIGS. 12, 13 (a), (b) and FIG. As described above, an obstacle 48 that disturbs the flow of oil coming out of the opening 29b on the opposite side of the reduction gear of the through hole 29 is provided.

The configuration is the same as that of the third embodiment except that the obstacle 48 is provided. That is, of the speed reducer-side inner peripheral surface 22b and the speed reducer-side inner peripheral surface 22b of the speed reducer-side inner peripheral surface 22b divided by the spider support 23, the speed reducer-side inner peripheral surface 22b is smaller than the inner diameter D1. While increasing the inner diameter D2 ′, a straight tubular through hole 29 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder 22. Six through holes 29 are provided at equal intervals in the circumferential direction of the rotor shaft 12.

  Since the inner diameter D2 ′ of the inner peripheral surface 22b opposite to the reduction gear is larger than the inner diameter D1 of the inner peripheral surface 22a of the speed reducer, the center line C of the through hole 29 is the radial direction (vertical direction in FIG. 18) of the rotor shaft 12 With a predetermined angle α (0 ° <α <90 °). The speed reducer side opening 29a of the through hole 29 opens in the radial direction inner side (vertical direction in FIG. 18) of the rotor shaft 12, and the speed reducer opposite side opening 29b of the through hole 29 is the axial direction of the rotor shaft 12 (FIG. 18). It opens to the left).

According to the fifth embodiment, among the speed reducer side inner peripheral surface 22a and the speed reducer opposite inner peripheral surface 22b partitioned by the spider support 23, the speed reducer is opposite to the inner diameter D1 of the speed reducer inner peripheral surface 22a. The inner diameter D2 ′ of the side inner peripheral surface 22b is increased, and a through hole 29 penetrating the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22, and the speed reducer side of the through hole 29 is provided. The opening 29a opens toward the radially inner side of the rotor shaft 12, and the opening 29b (opening to the other side opposite to the one side of the through hole) of the through hole 29 is provided. Part) and the speed reducer opposite side opening 29a (opening to one side of the through hole) are provided at positions shifted in the circumferential direction of the rotor shaft 12, and the speed reducer opposite side opening 39a of the through hole 29 is provided. (Opposite to one side of the through hole An obstacle 48 that disturbs the oil flow is provided in the vicinity of the opening to the other side. Thereby, the oil coming out from the opening 29b on the opposite side of the speed reducer collides with the obstacle 48 and is divided into two directions. Therefore, the area where the oil is in contact with the inner peripheral surface 22b on the opposite side of the speed reducer is that of the third embodiment. Larger than the case. Thereby, the cooling performance of the permanent magnet can be improved as compared with the case of the third embodiment.

( Sixth embodiment)
FIG. 21 is a schematic cross-sectional view of the motor 1 of the sixth embodiment, and FIG. 22 is a cross-sectional view taken along line AA of FIG. The same parts as those in FIGS. 1 and 2 of the comparative example 1 are denoted by the same reference numerals.

As shown in FIG. 22, eight permanent magnets 51 are equally embedded in the rotor core 31 in the circumferential direction of the rotor shaft 12. In this case, in the sixth embodiment, a through hole 52 having a semicircular cross section is provided near the permanent magnet 51 on the inner side in the radial direction of the rotor shaft 12 of the permanent magnet 51, that is, on the back side of the permanent magnet 51. Since the number of permanent magnets 51 is eight, the number of through holes 52 is also eight.

Except for the cross-sectional shape and the number of the through holes 52, the configuration is the same as that of the first comparative example . That is, the through-hole 52 which penetrates the spider support body 23 is provided in the attachment surface to the spider outer cylinder part 22 of the spider support body 23. As shown in FIG.

  Since the inner diameter of the speed reducer side inner peripheral surface 22a is equal to the inner diameter of the speed reducer opposite inner peripheral surface 22b, both the speed reducer side opening 52a and the speed reducer opposite side opening 52b of the through hole 52 are in the axial direction of the rotor shaft 12. It opens in the left-right direction in FIG.

According to the sixth embodiment, the through hole 52 that penetrates the spider support 23 is provided on the attachment surface of the spider support 23 to the spider outer cylinder portion 22, and the rotor shaft 12 of the permanent magnet 51 near the permanent magnet 51. A through hole 52 is provided on the radially inner side. Since the permanent magnet 51 generates a large amount of heat due to eddy current loss and may demagnetize when the temperature rises, the permanent magnet 51 is made effective by providing a through hole 52 near the permanent magnet 21 and flowing oil. Can be cooled.

( Seventh embodiment)
FIG. 23 is a schematic cross-sectional view of the motor 1 of the seventh embodiment, and FIG. 24 is a cross-sectional view taken along line AA of FIG. The same parts as those in FIG. However, only the oil guide 55 is shown in FIG.

In the seventh embodiment, on the premise of Comparative Example 2 , an oil guide 55 is provided in order to supply most of the oil after further lubricating the pinion gear 7 to the inner peripheral surface 22b on the speed reducer opposite side. That is, the cylindrical oil guide 55 covering the outer periphery of the speed reducer 5 is fixed to the right ring-shaped end plate 2b, and the spider support 23 side opening end 55b of the oil guide 55 is fitted into the spider outer cylinder portion 22. It extends to the position.

  The oil that has collided with the inner peripheral surface 55a of the oil guide 55 and the ring-shaped end plate 2b by the centrifugal force from the pinion gear 7 is transmitted to the inner peripheral surface 55a and the ring-shaped end plate 2b by gravity and the inner peripheral surface 55a below the oil guide 55 by gravity. Come together. In order to supply the collected oil toward the through hole 25 provided in the spider support 23, the oil guide 55 extends toward the reduction gear side inner peripheral surface 22a at the lower portion of the oil guide 55, and the reduction gear side inner peripheral surface 22a. A contact portion 55c is provided, and a groove 55d (see FIG. 24) is formed in the portion 55c.

According to the seventh embodiment, since the cylindrical oil guide 55 covering the outer periphery of the speed reducer 5 is provided, the oil scattered from the pinion gear 7 to the side away from the spider 21 is collected by the oil guide 55, It flows toward the through hole 25 provided in the spider support 23. This maximizes the amount of oil used for cooling the speed reducer opposite inner peripheral surface 22b.

DESCRIPTION OF SYMBOLS 1 Motor 2 Motor case 5 Reduction gear 7 Pinion gear 8 Stator 11 Rotor 12 Rotor shaft 21 Spider (support member)
22 Spider outer cylinder (outer cylinder)
23 Spider support (support)
24-30 Through hole 52 Through hole

Claims (5)

A rotor shaft;
A cylindrical rotor core that is located on the outer peripheral side of the rotor shaft and on which a permanent magnet is mounted;
In a motor including a rotor having a support member that connects and supports the rotor shaft and the rotor core,
The support member is
An outer cylinder fixed to the inner peripheral surface of the rotor core;
It consists of a disk-shaped support that partitions this outer cylinder part into two in the axial direction of the rotor shaft,
A speed reducer disposed on the outer periphery of the rotor shaft on one side partitioned by the support;
Oil supply that discharges oil from an oil flow path formed in the rotor shaft in the reducer, cools the support side end face of the reducer , and then supplies the oil to the inner peripheral surface of the outer cylinder portion on the reducer side and means,
A through hole penetrating through the support member to the mounting surface to the outer cylindrical portion of the support
Having
The portion of the rotor in which the inner diameter of the inner peripheral surface of the outer cylinder portion is decreased from both ends of the outer cylinder portion in the rotor shaft axial direction toward the inner side in the rotor shaft axial direction, and the inner diameter of the inner peripheral surface of the outer cylinder portion is minimized A motor characterized in that a shaft axial position is located between the support and a support-side end surface of the speed reducer . The opening to the other side opposite to the one side of the through hole is longer in the circumferential direction of the rotor shaft than the opening to the one side of the through hole and shorter in the radial direction of the rotor shaft. The motor according to claim 1 . An opening to the other side of the through hole opposite to the one side and an opening to the one side of the through hole are provided at positions shifted in the circumferential direction of the rotor shaft. The motor according to claim 1 . The through hole is composed of the first through hole on the one side and the second through hole on the other side opposite to the one side, and the center line of the first through hole is the circumference of the rotor shaft. 4. The motor according to claim 3 , wherein an angle formed with respect to the direction is smaller than an angle formed by a center line of the second through hole with respect to a circumferential direction of the rotor shaft. The motor according to claim 3 , wherein an obstacle that disturbs the flow of oil is provided in the vicinity of an opening portion to the other side opposite to the one side of the through hole.

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