Oil passage structure for automatic transmission

Abstract

To provide an oil passage structure that can limit an increase in the size of an automatic transmission.SOLUTION: An oil passage structure comprises an oil passage 60 constituted by a first groove 46 formed in a first wall 41 and a second groove 56 formed in a second wall 51 that is arranged to face the first wall 41, in which the first wall 41 has a first recess 45 that is recessed toward one side in an axial direction, on a surface on the other side in the axial direction, the second wall 51 has a second recess 55 that is located at a position different from the first recess 45 in a radial direction of a main shaft 2, and that is recessed toward the other side in the axial direction. A portion of a first component is disposed in the first recess 45, a portion of a second component is disposed in the second recess 55. In the oil passage 60, a second passage 62 located at a position corresponding to the second recess 55 is located on the other side in the axial direction relative to a first passage 61 located at a position corresponding to the first recess 45.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology disclosed herein belongs to the technical field related to oil passage structures of automatic transmissions. [Background technology]

[0002] 2. Description of the Related Art Conventionally, an oil passage structure in which an oil passage is formed using a housing of an automatic transmission has been known.

[0003] In Patent Document 1, a transaxle cover attached to an opening of a transaxle case that houses a vehicle power transmission device including a motor generator is provided with an oil supply passage that extracts oil supplied by an oil pump to the outside of the transaxle case.

[0004] In Patent Document 1, the oil supply passage extends in the radial direction of the main shaft of the transaxle (automatic transmission), and is formed integrally with the transaxle cover by casting using a core. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-88906 Summary of the Invention [Problem to be solved by the invention]

[0006] When an oil passage is formed by casting, as in the oil passage structure described in Patent Document 1, the oil passage has a tapered shape due to the draft angle of the core pin. If the oil passage extends in the radial direction of the main shaft, the oil passage widens in the axial direction of the main shaft, which increases the axial size of the automatic transmission.

[0007] In order to prevent the automatic transmission from becoming too large in the axial direction, it is possible to form an oil passage by machining the axial mating surfaces of the components that make up the automatic transmission. However, when components of the automatic transmission are located near the mating surfaces, it is necessary to form an oil passage with the necessary flow path cross-sectional area while preventing interference with the components. If the components are spaced apart from the oil passage to prevent interference between the oil passage and the components, the automatic transmission will ultimately have to be made larger in the axial direction.

[0008] The technology disclosed herein has been made in consideration of these points, and its purpose is to provide an oil passage structure that can prevent the automatic transmission from becoming too large. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, a first aspect of the technique disclosed herein is directed to an oil passage structure of an automatic transmission. The oil passage structure includes a first member constituting a first wall portion extending radially relative to a main shaft of the automatic transmission, a second member having a second wall portion extending radially and face-fitted to the first wall portion from one axial side of the main shaft, and an oil passage configured with a first groove portion formed in a surface of the first wall portion on the one axial side and extending in the radial direction, and a second groove portion formed in a surface of the second wall portion on the other axial side and extending in the radial direction, wherein the first wall portion has a first recessed portion recessed toward the one axial side in a surface portion on the other axial side, and the second wall portion has a second recessed portion recessed toward the other axial side in a surface portion on the one axial side, at least a part of a first component is disposed in the first recessed portion, and at least a part of a second component is disposed in the second recessed portion, and the oil passage is configured such that a second passage located at a position corresponding to the second recessed portion in the radial direction is located on the other axial side relative to a first passage located at a position corresponding to the first recessed portion in the radial direction.

[0010] In the first aspect, the first component can be arranged axially away from the first passage and close to the second passage. Meanwhile, the second component can be arranged axially away from the second passage and close to the first passage. This allows the axial size to be reduced while avoiding interference between the first component and the second component and the oil passage. Therefore, the automatic transmission can be prevented from becoming larger.

[0011] A second aspect is the first aspect, wherein the depth of the first groove portion is shallower in the first passage than in the second passage, and the depth of the second groove portion is shallower in the second passage than in the first passage.

[0012] In the second aspect, the first groove is shallower in the first passage corresponding to the position of the first protrusion, and the second groove is shallower in the second passage corresponding to the position of the second protrusion, thereby ensuring the flow path cross-sectional area of ​​the oil passage and making the shape of the oil passage match the first recess and the second recess, thereby preventing the automatic transmission from becoming larger.

[0013] In a third aspect, in the first aspect, the first passage is formed only by the second groove portion of the first groove portion and the second groove portion, and the second passage is formed only by the first groove portion of the first groove portion and the second groove portion.

[0014] In the third aspect, the first recess and the second recess can be made as deep as possible. This allows the first component to be positioned as close as possible to one axial side, and the second component to be positioned as close as possible to the other axial side. This prevents the automatic transmission from becoming too large.

[0015] A fourth aspect is that, in the first to third aspects, the first member is a motor housing that accommodates a motor, the first part is a rotation angle sensor, the motor is located on the other axial side of the first part, and a coil is located near the first part.

[0016] In the fourth aspect, since the coil of the motor is located near the first component, the motor and the first component must be spaced apart in the axial or radial direction. By placing the first component in the first recess, the first component can be spaced as far as possible from the motor in the axial direction. This prevents the automatic transmission from becoming too large.

[0017] A fifth aspect is the fourth aspect, in which a torque converter is arranged radially inward relative to the motor, the first recess is located radially outward relative to the second recess, and the first part measures the rotation angle of the torque converter and is located radially outward relative to the second part.

[0018] In the fifth aspect, because the torque converter is located radially inward of the motor, the first component must be arranged axially adjacent to the torque converter. Because the first recess is located radially outward of the second recess, the first component can be arranged as radially outward as possible. This allows the torque converter and the first component to be arranged axially adjacent to each other while being axially close to each other. This helps prevent the automatic transmission from becoming too large.

[0019] A sixth aspect is any one of the first to third aspects, wherein the second part is a bolt, and at least a part of a bolt head of the second part is disposed within the second recess.

[0020] In the sixth aspect, the amount of protrusion of the bolt head from the second wall portion toward one side in the axial direction can be minimized, thereby preventing the automatic transmission from becoming larger in size.

[0021] In the seventh aspect, in the sixth aspect, a third recess is located at the position of the bolt in the second recess, and is recessed toward the other axial side than other parts of the second recess, and the bolt head is positioned within the third recess.

[0022] In the seventh aspect, the amount of protrusion of the bolt head from the second wall portion toward one side in the axial direction can be minimized, thereby preventing the automatic transmission from becoming larger in size.

[0023] In an eighth aspect, in the seventh aspect, a speed change mechanism is provided on one axial side of the second wall portion and in the vicinity of the second recess.

[0024] In the eighth aspect, the amount of protrusion of the bolt head is reduced, so the transmission mechanism can be positioned as close as possible to the other axial side, thereby preventing the automatic transmission from becoming larger. [Effects of the Invention]

[0025] As described above, the technology disclosed herein can prevent the automatic transmission from becoming larger in size. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a schematic diagram of an automatic transmission having an oil passage structure according to a first exemplary embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a part of the oil passage. [Figure 3] FIG. 3 is an enlarged cross-sectional view of a region III in FIG. [Figure 4] FIG. 4 is a perspective view showing the first rear surface of the first wall portion. [Figure 5] FIG. 5 is a perspective view showing the second rear surface of the second wall portion. [Figure 6] FIG. 6 is a perspective view showing the second front surface of the second wall portion. [Figure 7] FIG. 7 is a cross-sectional view showing a part of an oil passage of an automatic transmission having an oil passage structure according to the second embodiment. [Figure 8] FIG. 8 is a perspective view showing a portion of the motor housing according to the second embodiment on the oil passage side. [Figure 9] FIG. 9 is a perspective view showing a portion of the cover according to the second embodiment on the oil passage side. DETAILED DESCRIPTION OF THE INVENTION

[0027] Exemplary embodiments will now be described in detail with reference to the drawings.

[0028] First Embodiment (1) Overall structure of the automatic transmission FIG. 1 shows an automatic transmission 1 having an oil passage structure according to the first embodiment. The automatic transmission 1 is an automatic transmission mounted on a vehicle. The vehicle is a hybrid vehicle having an engine E and a motor 30. The automatic transmission 1 changes the speed of rotation transmitted from the engine E or rotation of the motor 30 and outputs the rotation. In the following description, the term "axial direction" refers to the direction in which a main shaft 2 of the automatic transmission 1 extends, the term "radial direction" refers to the direction perpendicular to the direction in which the main shaft 2 extends, and the term "circumferential direction" refers to the circumferential direction of the main shaft 2. In addition, in the axial direction, the side of the engine E is referred to as the axial front side, and the side opposite the engine E is referred to as the axial rear side. The axial front side and the axial rear side referred to here do not limit the actual arrangement of the automatic transmission 1.

[0029] The automatic transmission 1 includes a damper 3 , a torque converter 10 , and a transmission mechanism 20 .

[0030] The damper 3 is disposed axially rearward of the engine E. The damper 3 is connected to the output shaft of the engine. The damper 3 suppresses vibrations caused by torque fluctuations of the engine.

[0031] The torque converter 10 is disposed axially rearward of the damper 3 and is housed in a motor housing 40 that also houses the motor 30. Within the motor housing 40, the motor 30 is configured such that a rotor 32 is disposed radially inside a stator 31, and the torque converter 10 is located radially inside the rotor 32. The motor housing 40 is made of aluminum or an aluminum alloy. The motor housing 40 is an example of a first member.

[0032] The torque converter 10 is connected to a transmission unit 11, which is connected to the output shaft of the engine E, via a clutch 12. The transmission unit 11 is also connected to a rotor 32 of the motor 30. When the clutch 12 is disengaged, the output shaft of the engine E and the transmission unit 11 are disconnected. On the other hand, when the clutch 12 is engaged, the engine E and the transmission unit 11 are connected. The clutch 12 is engaged when transmitting the rotation of the engine E to the transmission unit 11. On the other hand, the clutch 12 is disengaged, for example, when the vehicle is driven only by the rotation of the motor 30 without using the engine E, or when regenerative charging is performed.

[0033] The torque converter 10 transmits power via a fluid. The torque converter 10 has a lock-up clutch 13. When the lock-up clutch 13 is disengaged, the rotation of the engine E and the motor 30 is transmitted to the main shaft 2 via a fluid. When the lock-up clutch 13 is engaged, the rotation of the engine E and the motor 30 is transmitted from the transmission unit 11 to the main shaft 2 without passing through a fluid.

[0034] The transmission mechanism 20 changes the speed of the output transmitted from the main shaft 2. The transmission mechanism 20 is housed in a transmission case 21 located axially rearward of the motor housing 40. The transmission case 21 is fixed to the motor housing 40. The transmission mechanism 20 is configured to be able to form multiple gears with different gear ratios by combining multiple gears with different numbers of teeth. The number of gears is changed by hydraulic control.

[0035] A cover 50 attached to the motor housing 40 is disposed within the transmission case 21. The cover 50 is attached to a first wall portion 41 that is provided on the axial rear side of the motor housing 40 and extends radially. The cover 50 has a second wall portion 51 that extends radially and is flush with the first wall portion 41 from the axial rear side. The cover 50 is made of iron. As will be described in more detail below, the first wall portion 41 and the second wall portion 51 form an oil passage 60 through which oil flows. The cover 50 is an example of a second member.

[0036] (2) Oil passage structure As shown in Figure 1, a valve body 4 for supplying oil to the clutch 12, lock-up clutch 13, transmission mechanism 20, etc. is fixed to the lower portion of the transmission case 21. The valve body 4 is housed in an oil pan 5 that stores oil. The oil is pumped up by an oil pump (not shown) and supplied to each location via the valve body 4.

[0037] The automatic transmission 1 has an oil passage 60 for circulating oil radially inward from the valve body 4. The oil passage 60 is composed of a first groove 46 formed in the first wall portion 41 and a second groove 56 formed in the second wall portion 51. In order to explain the configuration of the oil passage 60, the first wall portion 41 and the second wall portion 51 will be described in detail below with reference to FIGS. 2 to 6. Note that the up-down direction in FIGS. 2 and 3 is reversed compared to FIG. 1.

[0038] (2-1) First wall part As shown in FIG. 2, the first wall portion 41 has a first front surface portion 42 which is the surface on the axial front side, and a first rear surface portion 43 which is the surface on the axial rear side.

[0039] A resolver 14 is attached to a radially outer portion of the first front face portion 42. The resolver 14 is a rotation angle sensor that measures the rotation angle of the torque converter 10. The resolver 14 has a measuring portion 14a that measures the rotation angle, a mounting portion 14b attached to the first front face portion 42, and a rotating rotor 14c attached to the torque converter 10. The mounting portion 14b extends radially outward from the measuring portion 14a, and its radially outer end is attached to the first front face portion 42 with a bolt. The bolt is attached to a portion of the first wall portion 41 that does not interfere with the oil passage 60. The measuring portion 14a protrudes on both axial sides from the mounting portion 14b. The axially front end of the measuring portion 14a overlaps with the axially rear end of the torque converter 10. The rotating rotor 14c is located axially rearward of the torque converter 10. The resolver 14 measures the rotation angle of the torque converter 10 by detecting the position of the rotor 14c with the measuring unit 14a. The resolver 14 is an example of a first component.

[0040] Within the motor housing 40, the motor 30 is located axially forward of the resolver 14. The radially outer end of the resolver 14 overlaps in radial position with the stator 31 of the motor 30. A coil 33 wound around the stator 31 is located near the resolver 14.

[0041] 3, the radially outer portion of the first front surface portion 42 is located axially rearward of the radially inner portion. Specifically, the first front surface portion 42 has a first recessed portion 45 that is provided at a radial position where the resolver 14 is located and recessed axially rearward. The position of the rear end face 43a of the first rear surface portion 43 is the same in the portion where the first recessed portion 45 is provided and in the other portions.

[0042] A part of the measuring portion 14a of the resolver 14 is disposed in the first recess 45. By providing the first recess 45, the resolver 14 can be separated from the coil 33 of the motor 30 in the axial direction.

[0043] The first groove 46 is formed in the first rear surface portion 43. The first groove 46 extends in the radial direction. The depth direction of the first groove 46 coincides with the axial direction.

[0044] The first groove portion 46 has a first outer groove portion 46a located relatively radially outward and a first inner groove portion 46b located relatively radially inward. The position of the first outer groove portion 46a corresponds to the radial position of the first recess 45. The bottom of the first outer groove portion 46a is located axially rearward of the bottom of the first inner groove portion 46b. Therefore, the first outer groove portion 46a is shallower than the first inner groove portion 46b. The difference between the depths of the first outer groove portion 46a and the first inner groove portion 46b is the same as the depth of the first recess 45.

[0045] 4, a plurality of (eight in this example) first groove portions 46 are provided. The width of each first groove portion 46 is the same. In each first groove portion 46, the first outer groove portion 46a is shallower than the first inner groove portion 46b.

[0046] In addition to the first groove portion 46, the first rear surface portion 43 is provided with a plurality of first reserve groove portions 47. The first reserve groove portions 47 are portions that form reserve spaces to prevent adjacent oil passages 60 from communicating with each other. The first reserve groove portions 47 are disposed, for example, between the oil passage leading to the clutch 12 and the oil passage leading to the transmission mechanism 20. The first reserve groove portions 47 communicate with the inner space of the motor housing 40 via holes or grooves. Oil that enters the space formed by the first reserve groove portions 47 is discharged through the holes or grooves.

[0047] The first wall portion 41 has a through-hole 48 penetrating the first wall portion 41. The through-hole 48 is a hole through which the main shaft 2 and a cylindrical portion 59 of the cover 50, which will be described later, pass.

[0048] (2-2) Second wall part As shown in FIG. 2, the second wall portion 51 has a second front surface portion 52 which is the surface on the axial front side, and a second rear surface portion 53 which is the surface on the axial rear side.

[0049] The second wall portion 51 is connected to the first wall portion 41 by a bolt 70. The axial direction of the bolt 70 coincides with the axial direction of the main shaft 2. The bolt 70 is disposed at a position that does not overlap with the resolver 14 in the radial direction, more specifically, at a position that is radially inward of the resolver 14. The bolt 70 is fastened to a portion of the first wall portion 41 and the second wall portion 51 that does not interfere with the oil passage 60. A bolt head 71 of the bolt 70 is located axially rearward of the second wall portion 51. The bolt 70 is an example of a second part.

[0050] As shown in FIG. 3 , a radially inner portion of the second rear surface portion 53 is located axially forward of a radially outer portion thereof. Specifically, the second rear surface portion 53 has a second recess 55 that is recessed axially forward at a radially different position from the first recess 45. The second recess 55 is located radially inward of the first recess 45. The second recess 55 overlaps in radial position with the torque converter 10. A portion of the bolt head 71 is located radially inward of the second recess 55. The position of the front end face 52a of the second front surface portion 52 is the same in the portion where the second recess 55 is provided and in the other portions.

[0051] At the position of the bolt 70 in the second recess 55, a third recess 58 is located, which is recessed axially further forward than the other parts of the second recess 55. A bolt head 71 is disposed in the third recess 58. The bolt head 71 protrudes axially rearward from the bottom of the third recess 58. The axially rear end face of the bolt head 71 is located slightly axially rearward from the second rear surface portion 53. The third recess 58 is deeper than the first recess 45. The part of the second recess 55 excluding the third recess 58 has the same depth as the first recess 45.

[0052] 5, the second recess 55 extends in the circumferential direction. The second recess 55 has a third recess 58 only at the position of the bolt 70.

[0053] 3, the speed change mechanism 20 is disposed axially rearward of the second wall portion 51 and in the vicinity of the second recess 55. A portion of the speed change mechanism 20 protrudes radially outward beyond the bolt head 71 in the second recess 55.

[0054] The second grooves 56 are formed in the second front surface portion 52. The second grooves 56 extend in the radial direction. The second grooves 56 are disposed at positions corresponding to the first grooves 46 in the circumferential direction. The depth direction of the second grooves 56 coincides with the axial direction.

[0055] The second groove portion 56 has a second outer groove portion 56a located relatively radially outward and a second inner groove portion 56b located relatively radially inward. The position of the second inner groove portion 56b corresponds to the radial position of the second recess 55. The bottom of the second inner groove portion 56b is located axially forward of the bottom of the second outer groove portion 56a. Therefore, the second inner groove portion 56b is shallower than the second outer groove portion 56a. The difference between the depths of the second outer groove portion 56a and the second inner groove portion 56b is the same as the depth of the second recess 55. Therefore, the difference between the depths of the second outer groove portion 56a and the second inner groove portion 56b is the same as the difference between the depths of the first outer groove portion 46a and the first inner groove portion 46b. The width of the second groove portion 56 is the same as the width of the first groove portion 46. The minimum depth of the second inner groove portion 56b is greater than the maximum depth of the first inner groove portion 46b.

[0056] 6, a plurality of second grooves 56 (eight in this example) are provided corresponding to the first grooves 46. The widths of the second grooves 56 are the same. In each of the second grooves 56, the second inner groove 56b is shallower than the second outer groove 56a.

[0057] In addition to the second grooves 56, the second front surface portion 52 is provided with a plurality of second preliminary grooves 57. The second preliminary grooves 57 are located corresponding to the positions of the first preliminary grooves 47. The second preliminary grooves 57 cooperate with the first preliminary grooves 47 to form the preliminary space. The second preliminary grooves 57 are deeper than the first preliminary grooves 47.

[0058] (2-3) Oil road As shown in Fig. 3, oil passage 60 is configured by axially aligning first groove portion 46 and second groove portion 56. A gasket 65 having holes formed therein that correspond to the shapes of first groove portion 46 and second groove portion 56 is disposed between first rear surface portion 43 and second front surface portion 52. As described above, a plurality of first groove portions 46 and second groove portions 56 are provided, and therefore a plurality of oil passages 60 are also provided. The plurality of oil passages 60 allow hydraulic oil for clutch 12, hydraulic oil for lock-up clutch 13, hydraulic oil for transmission mechanism 20, and lubricating oil to pass through independently.

[0059] The oil passage 60 has a first passage 61 and a second passage 62. The first passage 61 is composed of a first outer groove portion 46a and a second outer groove portion 56a. The second passage 62 is composed of a first inner groove portion 46b and a second inner groove portion 56b. Therefore, the second passage 62 is located radially inward of the first passage 61. Furthermore, the depth of the first groove portion 46 is shallower in the first passage 61 than in the second passage 62, and the depth of the second groove portion 56 is shallower in the second passage 62 than in the first passage 61. The difference between the depths of the first outer groove portion 46a and the first inner groove portion 46b is the same as the difference between the depths of the second outer groove portion 56a and the second inner groove portion 56b, and the widths of the first groove portion 46 and the second groove portion 56 are the same. Therefore, the flow path cross-sectional area of ​​the first passage 61 is the same as the flow path cross-sectional area of ​​the second passage 62. The second passage 62 is located axially forward of the first passage 61. Specifically, the axial center position of the second passage 62 is located axially forward of the axial center position of the first passage 61. Note that "the flow path cross-sectional areas are the same size" does not only mean that the flow path cross-sectional areas are exactly the same, but also means that the flow path cross-sectional areas are different enough to be considered to be substantially the same size.

[0060] Cover 50 has cylindrical portions 59 at a radially inner portion of second wall portion 51, extending from second wall portion 51 on both sides in the axial direction. Cylindrical portion 59 is integral with second wall portion 51. Spindle 2 passes through the cylindrical interior of cylindrical portion 59. Cylindrical portion 59 has a communication passage 63 formed therein that communicates with oil passage 60. Oil that has passed through oil passage 60 passes through communication passage 63 and is supplied to an oil passage formed in spindle 2.

[0061] (3) Effects of the First Embodiment Here, when the oil passage 60 is formed by the first wall portion 41 of the motor housing 40 and the second wall portion 51 of the cover 50 as in the first embodiment, interference between the resolver 14 and the bolt head 71 and the oil passage 60 becomes an issue. If the resolver 14 and the bolt head 71 are arranged away from the oil passage that extends straight in the radial direction, the axial size of the automatic transmission 1 will increase.

[0062] In contrast, the oil passage structure of the automatic transmission 1 according to the first embodiment includes a first recess 45 recessed axially rearward in the first front surface portion 42 of the first wall portion 41, and a second recess 55 recessed axially forward in the second rear surface portion 53 of the second wall portion 51, radially inward of the first recess 45. A portion of the resolver 14 is disposed in the first recess 45, and a portion of the bolt head 71 is disposed in the second recess 55. In the oil passage 60, the second passage 62, which is positioned corresponding to the second recess 55 in the radial direction, is positioned axially forward relative to the first passage 61, which is positioned corresponding to the first recess 45 in the radial direction. This allows the resolver 14 to be positioned axially away from the first passage 61 and close to the second passage 62. Meanwhile, the bolt head 71 can be positioned axially away from the second passage 62 and close to the first passage 61 in the axial direction. The oil passage structure can reduce the axial size while avoiding interference between the resolver 14 and the bolt head 71 and the oil passage 60, and can prevent the automatic transmission 1 from becoming large.

[0063] In particular, in the first embodiment, the resolver 14 protrudes axially forward relative to the first wall portion 41, and the bolt head 71 protrudes axially rearward relative to the second wall portion 51. By disposing a portion of the resolver 14 in the first recess 45, the amount of protrusion of the resolver 14 toward the front side in the axial direction is reduced. By disposing a portion of the bolt head 71 in the second recess 55, the amount of protrusion of the bolt head 71 toward the rear side in the axial direction is reduced. As a result, the oil passage structure can position the components disposed around the resolver 14 and the bolt head 71 as close as possible to the oil passage 60, thereby reducing the size of the automatic transmission 1.

[0064] In the first embodiment, the depth of the first groove portion 46 is shallower in the first passage 61 than in the second passage 62, and the depth of the second groove portion 56 is shallower in the second passage 62 than in the first passage 61. This allows the oil passage structure to ensure the flow path cross-sectional area of ​​the oil passage 60 while allowing the shape of the oil passage 60 to match the first recessed portion 45 and the second recessed portion 55. The oil passage structure can prevent the automatic transmission 1 from becoming larger.

[0065] In particular, in the first embodiment, the first passage 61 is composed of the first outer groove portion 46a and the second outer groove portion 56a, and the second passage 62 is composed of the first inner groove portion 46b and the second inner groove portion 56b, and the difference between the depth of the first outer groove portion 46a and the depth of the first inner groove portion 46b is the same as the difference between the depth of the second outer groove portion 56a and the depth of the second inner groove portion 56b. This allows the second passage 62 to be positioned axially forward of the first passage 61 while having the same flow path cross-sectional area as the first passage 61. The oil passage structure forms the oil passage 60 having an appropriate flow path cross-sectional area, while preventing the automatic transmission 1 from becoming larger.

[0066] Furthermore, in the first embodiment, the minimum depth of the second inner groove 56b is greater than the maximum depth of the first inner groove 46b. Because the motor housing 40 is made of aluminum or an aluminum alloy and the cover 50 is made of iron, the motor housing 40 has lower rigidity than the cover 50. If the minimum depth of the second inner groove 56b is greater than the maximum depth of the first inner groove 46b, the first wall 41 can be made as thick as possible. This allows the rigidity of the first wall 41 to be as high as possible, even when the oil passage 60 is formed by the first groove 46 and the second groove 56.

[0067] In the first embodiment, the first wall portion 41 is a wall portion of the motor housing 40 that accommodates the motor 30. The motor 30 is located axially forward of the resolver 14, and the coil 33 is located near the resolver 14. Because the coil 33 of the motor 30 is located near the resolver 14, the motor 30 and the resolver 14 need to be spaced apart in the axial or radial direction. By arranging the resolver 14 in the first recess 45, the resolver 14 can be spaced as far as possible from the motor 30 in the axial direction. Therefore, the oil passage structure can ensure the distance between the motor 30 and the resolver 14, thereby preventing the automatic transmission 1 from becoming larger in the axial direction.

[0068] In the first embodiment, the torque converter 10 is disposed radially inward relative to the motor 30, the first recess 45 is located radially outward relative to the second recess 55, and the resolver 14 measures the rotation angle of the torque converter 10 and is located radially outward relative to the bolt 70. Because the torque converter 10 is located radially inward relative to the motor 30, the resolver 14 must be disposed axially adjacent to the torque converter 10. Because the first recess 45 is located radially outward relative to the second recess 55, the resolver 14 can be disposed as radially outward as possible. This allows the torque converter 10 and the resolver 14 to be disposed axially adjacent to each other while being axially close to each other. Therefore, the oil passage structure can prevent the automatic transmission 1 from becoming larger.

[0069] In the first embodiment, the bolt head 71 is disposed within the second recess 55. In particular, in the first embodiment, the position of the bolt 70 in the second recess 55 is located at a third recess 58 that is recessed axially forward relative to other portions of the second recess 55, and the bolt head 71 is disposed within the third recess 58. The oil passage structure can minimize the amount of protrusion of the bolt head 71 axially rearward from the second wall portion 51, thereby preventing the automatic transmission 1 from becoming larger.

[0070] In the first embodiment, the transmission mechanism 20 is provided axially rearward of the second wall portion 51 and in the vicinity of the second recessed portion 55. In the vicinity of the second recessed portion 55, the second wall portion 51 is closer to the axial front, and the protrusion amount of the bolt head 71 is restricted by the third recessed portion 58, so that the transmission mechanism 20 can be positioned as far forward as possible in the axial direction. As a result, the oil passage structure can prevent the automatic transmission 1 from becoming larger.

[0071] In the first embodiment, the second preliminary groove portion 57 is deeper than the first preliminary groove portion 47. This allows the first wall portion 41 to be as thick as possible. Even when the oil passage 60 is formed by the first preliminary groove portion 47 and the second preliminary groove portion 57, the oil passage structure allows the rigidity of the first wall portion 41 to be as high as possible.

[0072] Second Embodiment Hereinafter, the second embodiment will be described in detail with reference to the drawings. In the following description, parts common to the first embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0073] (4) Oil passage structure 7 and 8, the first wall portion 241 is a wall portion on the axial rear side of the motor housing 240. A first front surface portion 242 of the first wall portion 241 has a first recessed portion 245 recessed axially rearward at a radial position where the resolver 14 is located. A part of the resolver 14 fits into the first recessed portion 245.

[0074] The first groove 246 is formed in the first rear surface portion 243. The first groove 246 extends in the radial direction. The depth direction of the first groove 246 coincides with the axial direction.

[0075] The first groove portion 246 has a first outer groove portion 246a located relatively radially outward and a first inner groove portion 246b located relatively radially inward. The position of the first outer groove portion 246a corresponds to the position in the radial direction where the first recess 245 is provided. The first outer groove portion 246a is significantly shallower than the first inner groove portion 246b. As will be described in detail later, the first outer groove portion 246a does not constitute the oil passage 260; only the first inner groove portion 246b constitutes the oil passage 260.

[0076] A plurality of (eight in this example) first groove portions 246 are provided. Each of the first groove portions 246 has the same width. In the second embodiment, in addition to the first groove portions 246, a plurality of first auxiliary groove portions 247 are also provided in the first rear surface portion 243. The first auxiliary groove portions 247 are portions that form auxiliary spaces that prevent adjacent oil passages 260 from communicating with each other.

[0077] 7 and 9, the second wall portion 251 is a wall portion formed by the cover 250. A second rear surface portion 253 of the second wall portion 251 has a second recess 255 recessed axially forward at a position where the bolt 70 is located in the radial direction. The bolt head 71 of the bolt 70 is located in the second recess 255. In the second embodiment, the third recess of the first embodiment is not provided.

[0078] The second groove portion 256 is formed in the second front surface portion 252. The second groove portion 256 extends in the radial direction. The depth direction of the second groove portion 256 coincides with the axial direction. The second groove portion 256 is provided only in a portion of the second front surface portion 252 that is radially outer than the second recessed portion 255. The radially inner end of the second groove portion 256 overlaps in radial position with the radially outer end of the first inner groove portion 246b. The depth of the second groove portion 256 is approximately the same as the depth of the first inner groove portion 246b. The width of the second groove portion 256 is the same as the width of the first groove portion 246.

[0079] A plurality of second groove portions 256 (eight in this example) are provided corresponding to the first groove portions 246. The width of each second groove portion 256 is the same. In addition to the second groove portions 56, a plurality of second preliminary groove portions 257 are provided in the second front surface portion 252. The second preliminary groove portions 257 are located corresponding to the positions of the first preliminary groove portions 247. The second preliminary groove portions 257 cooperate with the first preliminary groove portions 247 to form the preliminary space. The second preliminary groove portions 257 are deeper than the first preliminary groove portions 247.

[0080] As shown in Fig. 7, a gasket 265 is disposed between the first rear surface portion 243 and the second front surface portion 252. The gasket 265 has a hole 265a formed in the overlapping portion between the second groove portion 256 and the first inner groove portion 246b. The gasket 265 does not have a hole at the position of the first outer groove portion 246a. As a result, the first passage 261 is formed only by the second groove portion 256 of the first groove portion 246 and the second groove portion 256, and the second passage 262 of the oil passage 260 is formed only by the first groove portion 246 of the first groove portion 246 and the second groove portion 256.

[0081] In the oil passage 260, the second passage 262 is located axially further forward than the first passage 261. Since the depth of the second groove portion 256 is approximately the same as the depth of the first inner groove portion 246b, the flow path cross-sectional area of ​​the first passage 261 and the flow path cross-sectional area of ​​the second passage 262 are approximately the same.

[0082] (5) Effects of the Second Embodiment In the second embodiment, too, the oil passage structure of the automatic transmission 1 according to the first embodiment includes a first recess 245 recessed axially rearward in the first front surface portion 242 of the first wall portion 41 at a radial position where the resolver 14 is located, and a second recess 55 recessed axially forward in the second rear surface portion 253 of the second wall portion 251 at a radial position where the bolt head 71 is located. The oil passage 260 has a first passage 261 positioned at a position corresponding to the first recess 245 in the radial direction, and a second passage 262 positioned at a position corresponding to the second recess 255 in the radial direction, which is positioned further forward in the axial direction. This allows the resolver 14 to be positioned axially away from the first passage 261 and close to the second passage 262. Meanwhile, the bolt head 71 can be positioned axially away from the second passage 262 and close to the first passage 261. The oil passage structure can reduce the axial size while avoiding interference between the resolver 14 and the bolt head 71 and the oil passage 260, and can prevent the automatic transmission 1 from becoming large.

[0083] Furthermore, in the second embodiment, the first passage 261 is formed only by the second groove 256 of the first groove 246 and the second groove 256, and the second passage 262 is formed only by the first groove 246 of the first groove 246 and the second groove 256. Since the first recess 245 and the second recess 255 can be made as deep as possible, the resolver 14 can be positioned as far axially rearward as possible, and the bolt head 71 can be positioned as far axially forward as possible. Therefore, the oil passage structure can prevent the automatic transmission 1 from becoming larger.

[0084] (6) Other embodiments The technology disclosed herein is not limited to the above-described embodiments, and can be substituted within the scope of the claims.

[0085] For example, in the first and second embodiments described above, the resolver 14 is disposed relatively radially outward, and the bolt 70 is disposed relatively radially inward. However, the present invention is not limited to this, and the resolver 14 may be disposed relatively radially inward, and the bolt 70 may be disposed relatively radially outward. In this case, the second passages 62, 262 are positioned radially outward with respect to the first passages 61, 261.

[0086] In the first and second embodiments described above, the first component is the resolver 14. However, the first component is not limited to this. The first component may be something other than a resolver. For example, the first component may be the torque converter 10.

[0087] In the first and second embodiments described above, the second part is the bolt 70. However, the second part is not limited to this. The second part may be something other than a bolt. For example, the second part may be the speed change mechanism 20.

[0088] In the first embodiment described above, the third recess 58 is provided in which the bolt head 71 is disposed. However, this is not limiting, and the configuration of the first embodiment does not necessarily require the third recess 58. Even in this case, a portion of the bolt head 71 is disposed in the second recess 55.

[0089] In the first embodiment described above, the difference between the depth of the first outer groove portion 46a and the depth of the first inner groove portion 46b is the same as the difference between the depth of the second outer groove portion 56a and the depth of the second inner groove portion 56b. However, this is not limiting, and the difference between the depth of the first outer groove portion 46a and the depth of the first inner groove portion 46b may be different from the difference between the depth of the second outer groove portion 56a and the depth of the second inner groove portion 56b, as long as the flow path cross-sectional area of ​​the oil passage 60 can be appropriately ensured. In other words, the flow path cross-sectional area of ​​the first passage 61 and the flow path cross-sectional area of ​​the second passage 62 may be clearly different.

[0090] The above-described embodiments are merely examples and should not be construed as limiting the scope of the present disclosure. The scope of the present disclosure is defined by the claims, and all modifications and variations that fall within the scope of the claims equivalents are within the scope of the present disclosure. [Industrial Applicability]

[0091] The technology disclosed herein is useful as an oil passage structure for an automatic transmission. [Explanation of symbols]

[0092] 1 Automatic transmission 2 main shaft 14 Resolver (first part) 20 Transmission mechanism 30 motor 33 Coil 40 Motor housing (first member) 41 1st wall 45 First recess 46 First groove 50 Cover (second component) 51 2nd wall section 55 Second recess 56 Second groove 58 Third recess 60 Oil road 61 1st aisle 62 2nd aisle 70 Volts (2nd part) 71 Bolt head 240 Motor housing (first member) 241 1st wall section 245 First recess 246 First groove 250 Cover (second part) 251 2nd wall section 255 Second recess 256 Second groove 260 Oil road 261 1st aisle 262 2nd aisle

Claims

1. An oil passage structure of an automatic transmission, a first member constituting a first wall portion extending in a radial direction relative to a main shaft of the automatic transmission; a second member having a second wall portion extending in the radial direction and face-fitted to the first wall portion from one axial side of the main shaft; an oil passage including a first groove portion formed in a surface of the first wall portion on one side in the axial direction and extending in the radial direction, and a second groove portion formed in a surface of the second wall portion on the other side in the axial direction and extending in the radial direction, the first wall portion has a first recess portion recessed toward the one axial direction side on a surface portion on the other axial direction side, the second wall portion has a second recessed portion on a surface portion on one side in the axial direction, the second recessed portion being located at a position different from the first recessed portion in the radial direction and recessed toward the other side in the axial direction, At least a portion of a first component is disposed in the first recess, At least a portion of a second component is disposed in the second recess, The oil passage has an oil passage structure for an automatic transmission in which a first passage located at a position corresponding to the first recess in the radial direction is positioned on the other side in the axial direction, and a second passage located at a position corresponding to the second recess in the radial direction is positioned on the other side in the axial direction.

2. 2. The oil passage structure of an automatic transmission according to claim 1, a depth of the first groove portion is shallower in the first passage than in the second passage; An oil passage structure for an automatic transmission, wherein the second groove portion is shallower in depth than the first passage.

3. 2. The oil passage structure of an automatic transmission according to claim 1, the first passage is formed by only the second groove portion of the first groove portion and the second groove portion, The second passage is formed by only the first groove portion of the first and second groove portions.

4. The oil passage structure of an automatic transmission according to any one of claims 1 to 3, the first member is a motor housing that houses a motor, the first component is a rotation angle sensor, The motor is located on the other side of the first component in the axial direction, and the coil is located near the first component.

5. 5. The oil passage structure of an automatic transmission according to claim 4, A torque converter is disposed radially inward of the motor, the first recess is located radially outward of the second recess, The first component measures the rotation angle of the torque converter and is an oil passage structure of an automatic transmission located radially outward of the second component.

6. The oil passage structure of an automatic transmission according to any one of claims 1 to 3, the second component is a bolt that connects the first wall portion and the second wall portion, An oil passage structure for an automatic transmission, wherein at least a portion of the bolt head of the second component is disposed within the second recess.

7. 7. The oil passage structure of an automatic transmission according to claim 6, a third recess is located at the position of the bolt in the second recess, the third recess being recessed further toward the other side in the axial direction than other portions of the second recess; The bolt head is disposed within the third recess.

8. 8. The oil passage structure of an automatic transmission according to claim 7, An oil passage structure for an automatic transmission, wherein a speed change mechanism is provided at a position on one axial side of the second wall portion and in the vicinity of the second recess.

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