JP4258762B2 - Automatic transmission - Google Patents

Description

  The present invention relates to an automatic transmission for a vehicle.

  A vehicle body automatic transmission is provided with a valve body for hydraulic control of the transmission. This valve body usually includes a solenoid such as an ON-OFF solenoid that moves a spool of a valve that switches an oil passage for switching a gear position, and a duty solenoid (high-speed ON-OFF solenoid valve) that controls oil hydraulic pressure. Is used. When such a solenoid is used, it is desirable to suppress overheating and prevent air from entering the oil passage in order to ensure the performance of the solenoid and extend its life, and to reduce noise and the like. For this reason, some proposals regarding solenoids have been made (for example, Patent Documents 1 and 2), but when used in an automatic transmission, the solenoid is usually accommodated by accommodating the valve body in an oil pan. The actual situation is that the solenoid is immersed in oil, the solenoid is cooled by the oil, the air is prevented from entering, or the noise is reduced by being surrounded by an oil pan.

Japanese Patent Laid-Open No. 5-240367 Japanese Patent Laid-Open No. 5-263961

  However, since the internal space of the oil pan is also limited, it is not always possible to adopt a layout in which the valve body is accommodated in the oil pan. For example, when an automatic transmission is composed of a main transmission and a sub-transmission, a valve body for hydraulic control of each transmission is required, but the valve body for the main transmission is housed in an oil pan. Then, it is difficult to accommodate the valve body for the auxiliary transmission in the oil pan because of space. Further, it is desirable that the communication oil path between the valve body and the transmission is configured to be as short as possible from the viewpoint of hydraulic response. Therefore, depending on the layout of the automatic transmission, even if there is a space for accommodating the valve body in the oil pan, there is a case where it is desired to arrange the valve body in other parts.

  Accordingly, an object of the present invention is to provide an automatic transmission capable of improving the degree of freedom of the solenoid arrangement position and ensuring the performance and extending the life of the solenoid.

  According to the present invention, a transmission provided on a rotating shaft, a housing that houses the transmission, an oil pan that stores oil that lubricates the transmission, a solenoid for hydraulic control of the transmission, In the automatic transmission provided with the housing, the housing is provided with a housing chamber for housing the solenoid, a partition wall for partitioning the housing space of the transmission and the space in the housing chamber, and provided in the partition wall, An oil circulation hole provided in the partition wall so that the oil scattered from the transmission enters the storage chamber, and the storage chamber has a storage portion for storing oil entering from the oil distribution hole. In addition, an automatic transmission is provided in which the solenoid is disposed in the storage portion.

  In the automatic transmission according to the present invention, when oil that lubricates the transmission is scattered by centrifugal force or the like due to rotation of a gear or the like of the transmission, the oil is captured in the storage chamber through the oil circulation hole and is stored in the storage chamber. Stored in the part. For this reason, the solenoid arranged in the storage part is immersed in oil. As a result, the oil is cooled by the oil and air is prevented from entering the oil passage via the solenoid. Further, with such a configuration, the solenoid can be immersed in the oil without housing the solenoid in the oil pan. Therefore, the automatic transmission according to the present invention can improve the degree of freedom of the solenoid arrangement position and ensure the performance of the solenoid and extend its life.

  In the present invention, the oil pan may be disposed at the bottom of the housing, and the storage chamber may be disposed above the oil pan in the vehicle height direction and on the side of the transmission. Good.

  In the present invention, the rotating shaft has an oil passage for supplying the oil to the transmission, and a discharge port for discharging the oil flowing through the oil passage in a radial direction, It is desirable that an oil circulation hole is provided at a position corresponding to the discharge port. With this configuration, the oil scattered from the transmission can be efficiently captured in the storage chamber, and the storage of the oil in the storage unit is promoted.

  In the present invention, it is desirable that the storage chamber is composed of a peripheral wall portion provided integrally with the partition wall and a lid portion that closes an opening end of the peripheral wall portion. With this configuration, since the storage chamber is blocked from the outside, it is possible to achieve noise insulation from noise generated from the solenoid.

  In the present invention, it is desirable that the partition wall is a peripheral wall portion of the transmission in the housing. By using a part of the housing as the partition wall, the structure can be simplified and the storage chamber is disposed close to the transmission, so that the communication oil passage can be shortened. it can.

  In this case, it is desirable that the outline of the peripheral wall portion is a substantially inverted triangle shape from the upper side to the lower side in the vehicle height direction, and the storage portion is formed on the lower side. According to this configuration, the oil entering the storage chamber is easily concentrated in the storage portion along the outline of the peripheral wall portion, and the oil can be efficiently stored in the storage portion.

  In the present invention, it is desirable that the accommodating chamber accommodates a valve body that performs hydraulic control of the transmission, and the solenoid is a component part of the valve body. With this configuration, since the valve body can be provided close to the transmission, the communication oil passage can be shortened.

  In this case, the automatic transmission may include a main transmission and a sub transmission, and the valve body may be a valve body for the sub transmission. With this configuration, for example, it is possible to accommodate a case where the valve body for the main transmission is accommodated in the oil pan and there is no space for accommodating the valve body for the auxiliary transmission in the oil pan.

  As described above, according to the automatic transmission of the present invention, it is possible to secure the performance of the solenoid and to extend the life while improving the degree of freedom of the solenoid arrangement position.

  Preferred embodiments of the present invention will be described below with reference to the drawings. 1 is an external perspective view of an automatic transmission A according to an embodiment of the present invention, FIG. 2A is a right side view of the automatic transmission A when the front side of the vehicle is the front, and FIG. It is a rear view. The automatic transmission A includes a housing 10 that is divided in the vehicle width direction and is configured by combining housing members 11a and 11b on the illustrated mating surface. The housing 10 roughly includes a torque converter housing portion 12, a main transmission housing portion 13, a sub-transmission housing portion 14, and a differential device housing portion 15. The differential housing portion 15 is formed with a drive shaft attachment port 15a for the left front wheel and a drive shaft attachment port 15b for the right front wheel. An oil pan 17 is attached to the bottom of the housing 10, and each mechanism in the automatic transmission A is lubricated, and oil that serves as hydraulic fluid is accumulated. Here, an example of the internal mechanism of the automatic transmission A will be briefly described with reference to FIG. FIG. 5 is a skeleton diagram of the internal mechanism of the automatic transmission A.

The automatic transmission A includes a torque converter 120 housed in the torque converter housing portion 12, a main transmission 130 housed in the main transmission housing portion 13, and a sub-transmission 140 housed in the sub-transmission housing portion 14. And a differential device 150 accommodated in the differential device accommodating portion 15. Torque converter 120 transmits the rotational force output from the output shaft of engine 100 to input shaft 131. The oil pump 121 is driven by the output of the engine 100 being transmitted through the torque converter 120, and pumps the oil stored in the oil pan 17 to each part of the automatic transmission A. A part of the oil from the oil pump 121 is discharged from an oil passage provided along the axis of the input shaft 131 and the counter shaft 141 to the peripheral surface of the input shaft 131 and the counter shaft 141. It is discharged radially through and lubricates each mechanism of the main transmission 130 and the sub-transmission 140.

  The main transmission 130 is provided on the input shaft 131 and is a combination of two planetary gear mechanisms 132 and 133, and a forward clutch 134 a is interposed between the input shaft 131 and the sun gear of the planetary gear mechanism 132. And the sun gear of the planetary gear mechanism 133 and a 3-4 clutch 136 are provided between the input shaft 131 and the pinion carrier of the planetary gear mechanism 133, respectively. The 2-4 brake 137 fixes the sun gear of the planetary gear mechanism 133. A ring gear of the planetary gear mechanism 132 and a pinion carrier of the planetary gear mechanism 133 are connected, and a low reverse brake 138 and a one-way clutch 139 are disposed between the ring gear and the housing 10. The pinion carrier of the planetary gear mechanism 132 and the ring gear of the planetary gear mechanism 133 are connected, and the output gear 135 is connected to these.

  The sub-transmission 140 is provided on the counter shaft 141, is composed of a single planetary gear mechanism 142, and an input gear 143 that meshes with the output gear 135 is connected to the ring gear so that a rotational driving force from the main transmission 130 is obtained. Is transmitted. A direct clutch 144 is provided between the sun gear and the pinion carrier of the planetary gear mechanism 142, and a reduction brake 145 and a one-way clutch 146 are disposed between the sun gear and the housing 10. The pinion carrier of the planetary gear mechanism 142 is connected to the counter shaft 141, and the output of the auxiliary transmission 140 is input from the output gear 147 to the differential device 150 via the input gear 152 of the differential device 150, The driving force is transmitted to each of the drive shafts 151, and the differential device 150 biases the rotational driving force to the drive shaft 151.

  Next, returning to FIGS. 1 and 2, the positional relationship between the axes 131, 141, and 151 will be described. In the figure, axes d1, d2, and d3 indicate the axes of the input shaft 131, the counter shaft 141, and the drive shaft 151, respectively. Further, the positions of the shafts 131, 141, and 151 are shown only by broken lines in FIG. 2A, and in particular, the portions of the drive shaft 151 exposed outside the automatic transmission A are not shown. . First, the input shaft 131 is disposed in the vehicle width direction of the vehicle, and the counter shaft 141 and the drive shaft 151 are disposed in parallel with the input shaft 131. That is, these three axes are in a positional relationship parallel to each other. Further, these three shafts are set in the order of the input shaft 131, the counter shaft 141, and the drive shaft 151 from the front to the rear of the vehicle, and the position of the counter shaft 141 is higher than the drive shaft 151 in the vehicle height direction. Is set to a high position. In the case of this embodiment, the input shaft 131 is disposed at a height between the counter shaft 141 and the drive shaft 151 when viewed in the vehicle height direction. These relative positional relationships may be laid out due to the dimensional relationship of the gears constituting the main transmission 140, the sub-transmission 150, and the differential device 150, restrictions on the arrangement space of the automatic transmission A, and the like. According to a general design in which the output from the sub-transmission 140 is directly input to the differential gear mechanism of the differential device 150 as in this embodiment, the differential device is positioned below the sub-transmission 140. In general, the counter shaft 141 is disposed at a position higher in the vehicle height direction than the drive shaft 151, and the input shaft 131 is positioned at the same level or higher in the vehicle height direction than the drive shaft 151. It will be arranged in the position.

  Next, the configuration of the valve body housing chamber 16 will be described. In the case where the main transmission 130 and the sub-transmission 140 are switched in speed by hydraulic control, a hydraulic control valve body is required for each transmission. In this regard, the valve body of the main transmission 130 is normally housed in the oil pan 17, and the case of housing in the oil pan 17 is also assumed in this embodiment. However, the valve body for the auxiliary transmission 140 usually has insufficient space in the oil pan 17 to be accommodated in the oil pan 17, and the auxiliary transmission 130 is not provided in the present embodiment. When the oil pan 17 is disposed at a high position in the vehicle height direction and the oil pan 17 is disposed at the bottom, if the valve body for the auxiliary transmission 130 is accommodated in the oil pan 17, the oil passage becomes long and the hydraulic response is poor. Further, in the automatic transmission equipped with the main transmission 130 and the auxiliary transmission 140 like the automatic transmission A of the present embodiment, the auxiliary transmission is an add-on based on the design of the conventional automatic transmission with only the main transmission. Designed in the shape. For this reason, it is necessary to increase the rigidity around the counter shaft by adding the auxiliary transmission, and it is necessary to reinforce the housing. Therefore, in the present embodiment, the peripheral wall of the valve body housing chamber 16 that houses the valve body for the sub-transmission 140 is formed as a rib that reinforces the housing 10 around the sub-transmission 140, and the valve body is the sub-transmission. A configuration provided in the vicinity of 140 is employed. As described above, in this embodiment, the valve body housing chamber 16 is provided for the auxiliary transmission 140. However, for example, the valve body housing chamber for the main transmission 130 may be provided outside the oil pan 17 in the same manner. Furthermore, in the case where the automatic transmission is configured by a single transmission, the valve body housing chamber may be provided outside the oil pan in the same manner as the valve body housing chamber 16.

  Referring to FIGS. 1 and 2, the valve body housing chamber 16 is provided in a housing member 11 a that constitutes the housing 10, and includes a peripheral wall portion 161 that defines the housing chamber, and a lid portion that is fixed to an end surface of the peripheral wall portion 161. 162, disposed on the side of the sub-transmission 140 (on the back side of the automatic transmission A) in the vehicle height direction above the oil pan 17, and the mounting port of the differential device 15 15a and a drive shaft 151 attached thereto are disposed above. The configuration of the valve body storage chamber 16 will be further described with reference to FIGS. 3A and 3B are cross-sectional views along the line XX in FIG. 2A showing the end surface of the peripheral wall portion 161 to which the lid portion 162 is attached. FIG. 3A shows the valve body 200. FIG. 3 (b) shows a state where the valve body 200 is attached. 4A is a cross-sectional view taken along line YY in FIG. 3B (the configuration of the auxiliary transmission 140 is omitted). 3 (a) and 3 (b), the hatched portion is the end surface of the peripheral wall 161 serving as the mounting surface of the lid 162, and a plurality of screw holes 161a into which bolts for mounting the lid 162 are screwed are provided. It has been.

  The peripheral wall portion 161 is formed in a rib shape integrally with the peripheral wall portion 1400 constituting the auxiliary transmission housing portion 14 in the housing member 11a of the housing 10, and the peripheral wall portion 1400 is formed as shown in FIG. In addition to being used together as the bottom wall of the valve body housing chamber 16, it functions as a partition wall that partitions the internal space of the auxiliary transmission housing portion 14 and the internal space of the valve body housing chamber 16. Thus, by forming the peripheral wall portion 161 integrally with the peripheral wall portion 1400 in the shape of a rib, the rigidity of the housing 10 in the auxiliary transmission housing portion 14 is increased, and the weight increase due to the provision of the auxiliary transmission 140 and the counter shaft 141 are increased. The housing 10 can be reinforced in response to an increase in load on the housing 10. Further, as shown in FIGS. 3B and 4A, the valve body 200 is disposed immediately adjacent to the auxiliary transmission 140, so that the oil passage of the oil can be shortened and the hydraulic response is inferior. There is no. Furthermore, by using the peripheral wall portion 1400 which is a part of the housing 10 as a partition wall between the auxiliary transmission housing portion 14 and the valve body housing chamber 16, the structure can be simplified compared with the case where another partition wall is added. be able to. 3A, three holes 1402 are inlet holes of an oil passage through which oil (operating oil) supplied from the valve body 200 to the sub-transmission 140 passes, and the holes 1403 are connected to the valve body 200. It is an outlet hole of an oil passage through which supplied oil passes. The bolt hole 1404 is a bolt mounting hole for fixing the valve body 200.

  The peripheral wall portion 161 includes an upper side portion 161b along the axial direction of the counter shaft 141, a side portion 161c on the drive shaft side that is connected to the left end portion of the upper side portion 161b and is attached to the attachment port 15a, and an upper side portion 161b. And a side portion 161d on the drive shaft side attached to the attachment port 15b connected to the right end of the side portion, and the lower ends of the side portions 161c and 161c are connected to each other. Here, the side portion 161c has an inclined portion 161c 'that is inclined from the right end portion side of the upper side portion 161b toward the attachment port 15a. The reason why the inclined portion 161c 'is provided in this way is to improve the visibility of the attachment port 15a when the drive shaft 151 is attached to the attachment port 15a. The drive shaft 151 is attached after the automatic transmission A is mounted on the vehicle. However, when the automatic transmission A is mounted on the vehicle, the operator can move the front of the automatic transmission A due to the presence of the left and right bodies of the vehicle. The drive shaft 151 is attached by visually recognizing the attachment port 15a from the upper right side of the vehicle side (the front side of the vehicle). However, as employed in the present embodiment, the attachment port 15a is generally disposed at a position recessed in the vehicle width direction from the side surface of the automatic transmission A, and further, as in the present embodiment, the counter shaft 141 and the drive shaft 151. If the valve body housing chamber 16 is formed in the valley portion, the mounting port 15a is hidden behind the valve body housing chamber 16, and the mounting port 15a may be difficult to see. Therefore, in the present embodiment, the inclined portion 161c ′ is provided so that the attachment port 15a is not hidden behind the valve body housing chamber 16, thereby improving the workability of the attachment work of the drive shaft 151 by the operator. ing. On the other hand, while providing such an inclined portion 161c ′ and connecting the lower ends of the side portions 161c and 161d to each other in the present embodiment, the peripheral wall portion 161 has a substantially triangular shape (inverted triangular shape) with an endless outline. Thus, the peripheral wall 161 constitutes a closed space. For this reason, for example, the rigidity of the housing 10 can be further increased, and the rigidity of the housing 10 can be further increased as compared with the case where a straight reinforcing rib is simply provided on the peripheral wall portion 14a.

  In the present embodiment, as described below, the valve body housing chamber 16 is configured to be less projected to the back side (the vehicle rear side) of the automatic transmission A. Here, in general, in order to reduce damage to the passenger compartment in the case of a collision accident or the like, it is desirable to reduce the protrusion on the rear side of the automatic transmission and to provide more space between the automatic transmission and the passenger cabin. In the case of the configuration of the automatic transmission A according to the present embodiment, the portion where the valve body housing chamber 16 is disposed is the back side of the automatic transmission A and is the position facing the passenger compartment side of the vehicle, as shown in FIG. In the vehicle height direction, the valve body housing chamber 16 is disposed substantially parallel to a plane S1 passing through both the axis of the counter shaft 141 and the axis d3 of the drive shaft 151. More specifically, the plane S3 indicating the direction of the surface of the lid 162 and the plane S1 are configured to be substantially parallel and have an inclination of θ (about 20 degrees in this example) from the vertical direction. ing. Further, in the present embodiment, the plane S2 indicating the end surface of the peripheral wall portion 161 is also configured substantially parallel to the plane S1, and the mounting surface of the valve body 200 is also configured substantially parallel thereto.

  With such a configuration, the protrusion to the passenger cabin side is reduced at least in the upper part of the valve body housing chamber 16, the amount of protrusion to the rear side of the automatic transmission A due to the addition of the valve body 200 is reduced, and the automatic transmission The machine A can be further downsized.

  Next, the valve body 200 according to the present embodiment includes an accumulator 201 that absorbs hydraulic vibration, a valve 202 that switches an oil path to switch the gear position of the sub-transmission 140, and a duty that controls the oil pressure. A solenoid (high-speed ON-OFF solenoid valve) 203 and an ON-OFF solenoid 204 that moves the spool of the valve 202 are configured. In general, mechanical parts such as the accumulator 201 and the valve 202 are larger and wider than electronic parts such as the duty solenoid 203 and the ON-OFF solenoid 204. On the other hand, in the case of this embodiment, the outline of the valve body housing chamber 16 is substantially triangular. Therefore, in the present embodiment, as shown in FIGS. 3B and 4A, the accumulator 201 and the valve 202 having a larger width among the constituent parts of the valve body 200 are connected to the upper side portion 161 b side of the peripheral wall portion 151. In addition, the valve body 200 is configured such that the duty solenoid 203 and the ON-OFF solenoid 204 having a smaller width than these are respectively disposed below. By doing so, the valve body 202 has a shape conforming to the valve body housing chamber 16, and the valve body housing chamber 16 can be made more compact.

  Here, the duty solenoid 203 and the ON-OFF solenoid 204 are likely to generate heat when driven, and may deteriorate due to heat generation. Also, if air is mixed in the oil passage due to air suction, the target hydraulic pressure may not be obtained. Therefore, in the present embodiment, in order to solve such problems and to ensure the performance of the solenoid and to extend its life, oil is stored in the valve body housing chamber 16, and the duty solenoid 203 and the ON-OFF solenoid 204 are oiled. It is comprised so that it may be immersed in. This will be specifically described below. As shown in FIGS. 3A and 4A, the peripheral wall portion 1400 is provided with two upper and lower oil circulation holes 1401. The oil communication hole 1401 is a hole for communicating the internal space of the sub-transmission housing portion 14 and the internal space of the valve body housing chamber 16, and scatters from the sub-transmission 140 when the sub-transmission 140 is driven. Oil is provided so as to enter the valve body housing chamber 16. On the other hand, as described above, the valve body housing chamber 16 forms a closed space excluding the oil circulation hole 1401 by the enclosure of the peripheral wall portion 161, the lid portion 162, and the peripheral wall portion 1400. 16, a space below the lower oil circulation hole 1401 forms a storage portion 16 a that stores oil that has entered from the oil circulation hole 1401. That is, the oil that has entered through the oil circulation hole 1401 is gradually accumulated in the valve body housing chamber 16, and when the liquid level reaches the lower oil communication hole 1401, the overflowing oil is accommodated in the auxiliary transmission from the oil communication hole 1401. It will be returned to the internal space of the part 14.

  In this embodiment, the duty solenoid 203 and the ON-OFF solenoid 204 are disposed in the storage portion 16a (in other words, at least below the lower oil communication hole 1401). 204 is immersed in the stored oil. FIG. 4B is a view showing a state in which the solenoids 203 and 204 are immersed in oil. As shown in the figure, the oil scattered from the sub-transmission 140 is captured in the valve body housing chamber 16 through the oil circulation hole 1401 and stored in the storage portion 16a. As a result, the solenoids 203 and 204 are cooled by the oil, and air suction can be prevented. Further, since the valve body housing chamber 16 is shut off from the outside of the automatic transmission A by the enclosure of the peripheral wall portion 161, the lid portion 162, and the peripheral wall portion 1400, the noise generated from the solenoids 203 and 204 is insulated. Can be reduced.

  Further, as described above, since the contour of the peripheral wall portion 161 of the valve body housing chamber 16 has an inverted triangular shape, the oil that has entered the valve body housing chamber 16 is stored along the contour of the peripheral wall portion 161. The oil can be stored efficiently and can be stored efficiently. Further, in the present embodiment, the oil communication hole 1401 is provided at a position corresponding to the oil discharge port 141b of the counter shaft 141 so that the oil can easily enter the valve body housing chamber 16 from the auxiliary transmission 140. Has been. More specifically, as shown in FIGS. 4A and 4B, an oil passage 141a through which oil pumped from the oil pump 121 passes is provided in the axial direction inside the countershaft 141. A discharge port 141b that opens in the peripheral surface of the counter shaft 141 and extends in the radial direction is connected to the oil passage 141a. Then, lubricating oil is discharged in the radial direction from the discharge port 141b, and each mechanism of the auxiliary transmission 140 is lubricated. In the present embodiment, the oil communication hole 1401 is disposed at a position corresponding to the discharge port 141b, specifically, a position in the radial direction from the position where the discharge port 141b is provided. Since the amount of oil increases around the discharge port 141b, the amount of oil scattered in the oil communication hole 1401 also increases, and oil can enter and store in the valve body housing chamber 16 more efficiently.

1 is an external perspective view of an automatic transmission A according to an embodiment of the present invention. (A) is a right side view of the automatic transmission A when the front side of the vehicle is the front, and (b) is a rear view. (A) And (b) is sectional drawing which follows the line XX of Fig.2 (a) which shows the end surface of the surrounding wall part 161 to which the cover part 162 is attached, (a) shows the state which removed the valve body 200. , (B) shows a state in which the valve body 200 is attached. (A) And (b) is sectional drawing (The structure of the subtransmission 140 is abbreviate | omitted) which follows the line YY of FIG.3 (b), (b) shows the aspect by which the oil is stored. 2 is a skeleton diagram of an internal mechanism of an automatic transmission A. FIG.

Explanation of symbols

A Automatic transmission 10 Housing 16 Valve body accommodating chamber 16a Storage part 130 Main transmission 131 Input shaft 140 Sub transmission 141 Counter shaft 141a Oil passage 141b Discharge port 150 Differential device 151 Drive shaft 161 Peripheral wall part 161b Upper side part 161c 'Inclination Part 162 Lid 200 Valve body 203 Duty solenoid 204 ON-OFF solenoid 1400 Perimeter wall part (partition wall)
1401 Oil communication hole

Claims (8)

An automatic transmission comprising: a transmission provided on a rotary shaft; a housing that houses the transmission; an oil pan that stores oil that lubricates the transmission; and a solenoid for hydraulic control of the transmission. In
A housing chamber provided in the housing for housing the solenoid;
A partition wall that partitions the accommodation space of the transmission and the space in the accommodation chamber;
An oil circulation hole provided in the partition wall, provided in the partition wall, and provided in the partition wall so that the oil scattered from the transmission enters the storage chamber;
The automatic transmission characterized in that the storage chamber has a storage portion for storing oil entering from the oil circulation hole, and the solenoid is disposed in the storage portion.   The oil pan is disposed at a bottom portion of the housing, and the storage chamber is disposed above the oil pan in a vehicle height direction and on a side of the transmission. Item 2. The automatic transmission according to Item 1. The rotating shaft has an oil passage for supplying the oil to the transmission, and a discharge port for discharging the oil flowing through the oil passage in a radial direction,
The automatic transmission according to claim 1, wherein the oil circulation hole is provided at a position corresponding to the discharge port.   The said storage chamber is comprised from the surrounding wall part provided integrally with the said partition wall, and the cover part which closes the opening end of the said surrounding wall part, The Claim 1 thru | or 3 characterized by the above-mentioned. Automatic transmission as described.   The automatic transmission according to claim 4, wherein the partition wall is a peripheral wall portion of the transmission in the housing. The contour of the peripheral wall is
The automatic transmission according to claim 4, wherein the automatic transmission has a substantially inverted triangular shape from the upper side to the lower side in the vehicle height direction, and the storage portion is formed on the lower side. The automatic transmission according to any one of claims 1 to 6, wherein a valve body that performs hydraulic control of the transmission is housed in the housing chamber, and the solenoid is a component of the valve body. .   The automatic transmission according to claim 7, wherein the automatic transmission includes a main transmission and a sub-transmission, and the valve body is a valve body for the sub-transmission.

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