JP6696839B2 - Automatic transmission - Google Patents

Description

  The present invention relates to an automatic transmission.

  Vehicles such as passenger cars are provided with an automatic transmission that is connected to an engine that outputs drive torque and that transmits the torque to the drive shaft while converting the torque at a predetermined gear ratio. Further, in a hybrid vehicle including an engine and a driving motor as a device that generates the driving force of the vehicle, the driving motor may be incorporated in the automatic transmission. The automatic transmission incorporates a plurality of hydraulically controlled clutches and brakes. Further, a continuously variable transmission, which is one mode of a transmission mechanism provided in the automatic transmission, incorporates a hydraulically controlled primary pulley and a secondary pulley.

  In order to control the pressure of hydraulic oil supplied to these clutches, pulleys, etc., the automatic transmission is provided with a valve unit including a plurality of solenoid valves. In this case, the valve unit needs to be constantly immersed in the hydraulic oil so that air is not caught in the solenoid or the spool of the solenoid valve. Further, if the solenoid valve is not immersed in the hydraulic oil, the temperature of the solenoid valve may rise and the solenoid valve may be damaged. Therefore, the valve unit is often constantly immersed in the hydraulic oil. Furthermore, if the solenoid valve included in the valve unit is immersed in the hydraulic oil, the solenoid valve can be warmed up by the hydraulic oil during cold start or the like.

  The hydraulic control valve unit is attached to, for example, the bottom surface or wall surface of a transmission case of an automatic transmission. When the valve unit is attached to the bottom surface of the mission case, the valve unit may be constantly immersed in the hydraulic oil supplied and stored in the mission case. On the other hand, when the valve unit is attached to the wall surface of the mission case, in order to constantly immerse the valve unit in the hydraulic oil, it is necessary to store a predetermined amount of the hydraulic oil in the valve chamber that houses the valve unit.

  For example, Patent Document 1 discloses an automatic transmission in which a hydraulic control valve unit is attached to a wall surface of a mission case, and an oil sump is formed by both a valve body cover that houses a valve body and the mission case. An automatic transmission that secures an oil level equivalent to the oil level of hydraulic oil in a mission case is disclosed.

JP, 2010-71335, A

  However, although the automatic transmission disclosed in Patent Document 1 can cool the solenoid valve in a state in which a part of the solenoid valve included in the valve unit is located above the oil level, the solenoid valve can be cooled. Air may get caught in the solenoid or spool of. Further, in the automatic transmission disclosed in Patent Document 1, the inside of the valve body cover is connected to the inside of the mission case, and the oil level of the oil sump surrounded by the valve body cover becomes the same as the oil level in the mission case. Has been done. Therefore, in the automatic transmission disclosed in Patent Document 1, the mounting position of the valve body cover is limited.

  On the other hand, regardless of the oil level in the mission case, in order to raise the oil level in the valve chamber accommodating the valve unit to a predetermined level or higher, the inlet and outlet of hydraulic oil should be located above the desired oil level. It is conceivable to provide it and store the hydraulic oil in the valve chamber. However, if the inlet and outlet of the hydraulic oil are simply provided above the desired oil level, the relatively high temperature hydraulic oil that flows into and is discharged from the valve chamber will be stored in the valve chamber. Therefore, the temperature of the hydraulic oil in the valve chamber may vary. As described above, the hydraulic oil flowing into the valve chamber is used not only for cooling the electromagnetic valve that generates heat, but also for warming up the electromagnetic valve at the time of cold start or the like. Therefore, if the relatively high temperature hydraulic oil flows near the oil surface of the hydraulic oil in the valve chamber, warming up of the solenoid valve located on the bottom side of the hydraulic oil in the valve chamber may be delayed.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to constantly immerse the solenoid valve in the valve chamber provided on the side surface of the mission case in hydraulic oil while An object of the present invention is to provide a new and improved automatic transmission capable of suppressing variations in the temperature of hydraulic oil.

In order to solve the above-mentioned problems, according to an aspect of the present invention, a mission case accommodating at least a part of a power unit of a vehicle therein, and a hydraulic control valve unit provided in a side surface of the mission case and accommodated vertically are provided. Is provided below the height position of the inlet and the height position of the discharge port, the inlet for allowing the hydraulic oil to flow into the valve chamber, the outlet for discharging the hydraulic oil from the valve chamber. A passage through which hydraulic oil that flows into the valve chamber through the inflow port and is discharged through the exhaust port passes ,
There is provided an automatic transmission in which the inlet and the outlet are provided at least above a height position of a solenoid valve included in the hydraulic control valve unit, and the passage is provided below the solenoid valve. It

According to another aspect of the present invention, a mission case for accommodating at least a part of a power unit of a vehicle therein, and a valve chamber provided on a side surface of the mission case for accommodating a hydraulic control valve unit vertically are provided. , The inlet for letting the working oil flow into the valve chamber, the outlet for discharging the working oil from the valve chamber, and the height position of the inlet and below the height position of the outlet, and through the inlet. And a passage through which hydraulic oil that flows into the valve chamber and is discharged through the discharge port passes.The valve chamber is formed by attaching a cover to the outer peripheral surface of the mission case, and the passage is formed in the mission case. automatic transmission that will be formed by a partition wall provided between the outer peripheral surface and the inner surface of the cover is provided.

  The partition wall may be provided on at least one of the outer peripheral surface of the mission case and the inner surface of the cover.

  The automatic transmission is a transmission for a hybrid vehicle, and the hydraulic control valve unit is a first hydraulic control valve unit that controls connection and disconnection of a motor clutch that switches whether to transmit power of a vehicle drive motor. The automatic transmission may include a main valve chamber at the bottom of the transmission case, in which a second hydraulic control valve unit for controlling a controlled object other than the motor clutch is accommodated horizontally.

  In the automatic transmission, the control characteristic of the first hydraulic control valve unit may be set according to the temperature of the hydraulic oil flowing in the main valve chamber.

  As described above, according to the present invention, it is possible to suppress the variation in the temperature of the hydraulic oil in the valve chamber while always immersing the solenoid valve in the valve chamber provided on the side surface of the mission case in the hydraulic oil.

It is a schematic diagram showing an example of composition of an automatic transmission concerning an embodiment of the invention. FIG. 3 is a schematic view showing an arrangement example of a case and a valve chamber of the automatic transmission according to the same embodiment. FIG. 3 is a perspective view schematically showing a case (first case) of the automatic transmission according to the same embodiment. FIG. 3 is a perspective view schematically showing a case (first case) of the automatic transmission according to the same embodiment. FIG. 3 is a side view schematically showing a case (first case) of the automatic transmission according to the same embodiment. FIG. 3 is a perspective view schematically showing the cover of the automatic transmission according to the same embodiment. It is a schematic diagram which shows the flow of the hydraulic fluid in the valve chamber of the automatic transmission concerning a reference example. It is a schematic diagram which shows the flow of the hydraulic fluid in the valve chamber of the automatic transmission which concerns on the same embodiment. It is a side view which shows schematically the case (1st case) of the automatic transmission concerning a modification. It is a schematic diagram which shows the flow of the hydraulic fluid in the valve chamber of the automatic transmission which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals, and a duplicate description will be omitted.

<1. Overall structure of automatic transmission>
First, an example of an automatic transmission to which the present invention can be applied will be briefly described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing an automatic transmission 2 connected to an engine 1. FIG. 2 is a schematic diagram showing a configuration example of the case and the valve chamber of the automatic transmission 2.

  As shown in FIG. 1, in the automatic transmission 2 according to the present embodiment, a motor 4 for power generation and driving force generation is directly attached to an output shaft of an engine 1 or a power transmission mechanism such as a torque converter or a gear. The automatic transmission 2 is mounted on a hybrid vehicle that is connected via a vehicle. In this embodiment, the automatic transmission 2 includes a transmission mechanism 3 and a motor 4. For example, the output torque from at least one of the engine 1 and the motor 4 is input to the continuously variable transmission mechanism 3, and the transmission mechanism 3 transmits gears 5, a front wheel output shaft 9, and a differential mechanism 8 to drive wheels (not shown). Is output to.

  Note that, in the present embodiment, an example in which the continuously variable transmission mechanism 3 is provided will be described below, but the transmission mechanism may be a stepped transmission mechanism.

  The continuously variable transmission mechanism 3 has a primary shaft driven by output torque from the engine 1 and a secondary shaft parallel to the primary shaft. A primary pulley is provided on the primary shaft, and a secondary pulley is provided on the secondary shaft. Oil chambers are defined in the primary pulley and the secondary pulley, and the pulley groove width can be changed by adjusting the pressure in the oil chamber. By adjusting the widths of these pulley grooves and changing the winding diameter of the power transmission member such as the drive belt, the rotation speed of the primary shaft can be continuously changed and transmitted to the secondary shaft.

  A front wheel output shaft 9 is connected to the secondary shaft via a gear 5, and the front wheel output shaft 9 is connected to the front wheels via a differential mechanism 8. Further, the automatic transmission 2 has a rear wheel output shaft (not shown) that is parallel to the front wheel output shaft 9, and the front wheel output shaft and the rear wheel output shaft are connected via a gear and a transfer clutch (not shown). Good. The rear wheel output shaft may be connected to the rear wheel via a propeller shaft and a rear differential mechanism (not shown).

  Further, in order to transmit the output torque from the engine 1 to the continuously variable transmission mechanism 3, a torque converter, a forward / reverse switching mechanism and the like (not shown) are provided between the output shaft of the engine 1 and the primary shaft. ing. The forward / reverse switching mechanism includes a planetary gear train, a clutch mechanism, a brake mechanism, and the like, and can switch the rotation direction of the primary shaft.

  An inverter 6 is connected to the motor 4, and the inverter 6 converts the DC power from the battery 7 into AC power and supplies the AC power to the motor 4 to drive the motor 4. Further, the electric power generated by the motor 4 is supplied to the battery 7 via the inverter 6 to charge the battery 7. The motor 4 and the primary shaft are connected via a motor clutch, and whether power transmission between the motor 4 and the primary shaft can be switched.

  As shown in FIG. 2, the automatic transmission 2 according to the present embodiment includes a first case 10, a second case 20 and a third case 30 as mission cases. The second case 20 is a converter case that is provided on the engine 1 side and that houses the torque converter therein. The third case 30 is a main case in which the forward / reverse switching mechanism, the continuously variable transmission mechanism 3, and the like are housed. The first case 10 is a motor case in which the motor 4 is mainly housed.

  The configuration of the mission case shown in FIG. 2 is an example, and some of the first case 10, the second case 20, and the third case 30 may be integrated. Further, the mission case may further have a case other than the first case 10, the second case 20, and the third case. For example, the mission case may further include a transfer case in which a transfer clutch is housed. Furthermore, the arrangement order of each case is not limited to the above example.

  In order to supply hydraulic oil to the above-mentioned primary pulley, secondary pulley, torque converter, forward / reverse switching mechanism, transfer clutch, etc., the main hydraulic control valve unit (second hydraulic control) is provided at the bottom of the third case 30. A main valve chamber 90 that accommodates a valve unit) is provided. Further, in order to supply hydraulic oil to the above-mentioned motor clutch, a valve chamber 100 accommodating a hydraulic control valve unit (first hydraulic control valve unit) is provided on the side surface of the first case 10. There is. The valve chamber 100 can be additionally provided separately from the main valve chamber 90, for example. Further, the valve chamber 100 may be provided on the side surface of the first case 10 for layout reasons, for example.

  The main hydraulic control valve unit housed in the main valve chamber 90 includes, for example, an electromagnetic proportional valve that controls the line pressure of the main oil passage of the hydraulic circuit of the automatic transmission 2. The main hydraulic control valve unit is a valve. To an electromagnetic proportional valve that controls the hydraulic pressure supplied to the hydraulic control valve unit housed in the chamber 100, an electromagnetic proportional valve that controls the hydraulic pressure supplied to the oil chambers of the primary pulley and the secondary pulley, a forward / reverse switching mechanism, and other clutches An electromagnetic proportional valve for controlling the hydraulic pressure to be supplied and other pressure reducing valves are provided. The main hydraulic pressure control valve unit is supplied with hydraulic oil that is pumped by an oil pump (not shown), and each solenoid valve is controlled by a transmission control device (not shown) to control the hydraulic pressure to each part.

  The main valve chamber 90 is provided at the bottom of the mission case (third case 30), and the main hydraulic pressure control valve unit is horizontally disposed inside the main valve chamber 90. That is, the plurality of valves are arranged at substantially the same height position (hereinafter, the main valve chamber 90 may be referred to as the “horizontal valve chamber 90”). The hydraulic oil supplied into the mission case (third case 30) and falling into the main valve chamber 90 flows into the main valve chamber 90. The main hydraulic control valve unit is constantly immersed in the hydraulic oil, and the main hydraulic control valve unit is electromagnetized by the hydraulic oil. The proportional valve can be warmed up or cooled. In the horizontally installed main valve chamber 90, the operating oil easily flows while being dispersed throughout, so that the temperature variation of the operating oil is small.

  The main valve chamber 90 is provided with, for example, a thermistor 95 as a temperature sensor. The thermistor 95 detects the temperature of the hydraulic oil in the main valve chamber 90. The characteristics of the solenoid of the solenoid valve included in the main hydraulic control valve unit may change depending on the oil temperature. Further, the operation of the spool of the solenoid valve or the like may change depending on the oil temperature. Therefore, the solenoid valve is controlled while correcting the control characteristic according to the oil temperature detected by the thermistor 95. For example, the transmission control device may correct the control amount of the solenoid valve by referring to a correction map that corrects the control amount of the solenoid valve according to the oil temperature.

  The hydraulic control valve unit housed in the valve chamber 100 includes, for example, an electromagnetic proportional valve that controls the hydraulic pressure supplied to the motor clutch and other pressure reducing valves. Hydraulic oil is supplied to the hydraulic control valve unit via the main hydraulic control valve unit, and the solenoid valve is controlled by a transmission control device (not shown) to control the hydraulic pressure to each part.

  The valve chamber 100 is provided on the side surface of the mission case (first case 10), and the hydraulic control valve unit is vertically arranged in the valve chamber 100. That is, the plurality of valves are arranged at different height positions (hereinafter, the valve chamber 100 may be referred to as “vertical valve chamber 100”). The hydraulic oil supplied into the mission case (first case 10) flows into the valve chamber 100, and the hydraulic oil is further discharged from the valve chamber 100 into the mission case (second case 20). .. The hydraulic control valve unit housed in the valve chamber 100 may be immersed in the hydraulic oil stored in the valve chamber 100.

  In the automatic transmission 2 according to the present embodiment, although the valve chamber 100 is provided on the side surface of the mission case (first case 10), the electromagnetic valve housed inside is immersed in hydraulic oil and operated. The variation in oil temperature is suppressed. In the automatic transmission 2 according to this embodiment, the valve chamber 100 is not provided with a temperature sensor.

<2. Configuration example of valve chamber (vertical valve chamber)>
Next, a configuration example of the vertical valve chamber 100 provided on the side surface of the mission case (first case 10) will be specifically described with reference to FIGS. 3 to 6. 3 is a perspective view of the first case 10 viewed from the third case 30 side, and FIG. 4 is a perspective view of the first case 10 viewed from the second case 20 side. FIG. 5 is a side view of the first case 10. FIG. 6 is a perspective view of the cover 150 attached to the side surface of the first case 10.

  The first case 10 has a case body 11, a first flange 13, and a second flange 15. The first flange 13 is provided at the end of the case body 11 on the side of the second case 20 and abuts and is connected to the second case 20. The second flange 15 is provided at the end of the case body 11 on the side of the third case 30 and abuts and is connected to the third case 30. The first case 10 has a motor housing portion 19 on a surface facing the second case 20. In addition, the first case 10 has a plurality of holding holes on the surface facing the second case 20 and the third case 30 for holding the rotating shaft or the bearing.

  A recess 110 that forms the valve chamber 100 is provided on the side surface of the first case 10. The peripheral edge portion 101 of the recess 110 is an abutting surface to which the flange portion 151 provided on the outer peripheral portion of the mounted cover 150 abuts and is attached. By attaching the cover 150 to the recess 110 of the first case 10, the valve chamber 100 is formed by the recess 110 and the inner peripheral portion of the cover 150. A seal member such as a seal ring is arranged between the flange portion 151 of the cover 150 and the peripheral edge portion 101 of the recess 110, and the cover 150 is liquid-tightly attached to the first case 10.

  A fixed portion 103 to which the hydraulic control valve unit is fixed is provided inside the recess 110. The hydraulic control valve unit is vertically fixed to the fixed portion 103. Further, a hydraulic oil inlet 131 and a discharge outlet 121 are provided on the upper side inside the recess 110. The hydraulic oil inlet 131 is provided in the upper portion of the recess 110 on the side of the third case 30. Further, the hydraulic oil outlet 121 is provided in the upper portion of the recess 110 on the side of the second case 20. The inflow port 131 allows the hydraulic oil supplied into the first case 10 to flow into the valve chamber 100. The discharge port 121 discharges the hydraulic fluid flowing into the valve chamber 100 to the second case 20 side. The positions of the inflow port 131 and the exhaust port 121 may be reversed. The flow of the hydraulic oil into the valve chamber 100 and the discharge of the hydraulic oil from the valve chamber 100 are achieved by the flow of the hydraulic oil into the mission case without using a separate pump or the like.

  A case-side partition wall 111 is provided inside the recess 110. Similarly, a cover-side partition wall 153 is provided on the inner peripheral portion of the cover 150. The cover-side partition wall 153 is provided at a position corresponding to the case-side partition wall 111 so as to come into contact with the case-side partition wall 111 when the cover 150 is attached to the first case 10. That is, when the cover 150 is attached to the first case 10, the case-side partition wall 111 and the cover-side partition wall 153 work together to block the flow of hydraulic oil.

  The case-side partition wall 111 and the cover-side partition wall 153 are provided along the vertical direction (vertical direction). The lower portions of the case-side partition wall 111 and the cover-side partition wall 153 do not contact the lower surface of the recess 110 or the inner peripheral portion of the cover 150, respectively, and a gap is provided. The gap serves as a passage 119 for the hydraulic oil that flows into the valve chamber 100 through the inflow port 131 and is discharged through the exhaust port 121. The upper parts of the case-side partition wall 111 and the cover-side partition wall 153 may be extended to at least a position higher than the oil surface of the hydraulic oil, and are not in contact with the recess 110 or the upper surface of the inner peripheral portion of the cover 150, respectively. May be. The case-side partition wall 111 and the cover-side partition wall 153 have an oil surface side of the hydraulic oil stored in the valve chamber 100, an area where the hydraulic oil inlet 131 is provided, and an area where the discharge outlet 121 is provided. It is provided so as to be divided into. At this time, the hydraulic control valve unit is arranged in the region where the inflow port 131 is provided.

  The case-side partition wall 111 and the cover-side partition wall 153 may not completely block the flow of the hydraulic oil in the valve chamber 100, and the case-side partition wall may give a predetermined resistance to the flow of the hydraulic oil. It suffices if the 111 and the cover-side partition wall 153 are provided.

  The oil surface of the hydraulic oil flowing into the valve chamber 100 is formed at the position of the inflow port 131 or the discharge port 121, whichever is lower in height. In the automatic transmission 2 according to the present embodiment, the hydraulic oil inlet 131 and the discharge outlet 121 are provided at substantially the same height position, and the oil surface of the hydraulic oil flowing into the valve chamber 100 is It is formed at the height position of the inlet 131 and the outlet 121. At least the solenoid valve of the hydraulic control valve unit fixed to the fixed portion 103 is arranged below the position of the oil level, that is, below the height position of the inflow port 131 and the discharge port 121. As a result, at least the solenoid valve is constantly immersed in the hydraulic oil, and air is not caught in the solenoid or the spool.

  In addition, since the oil surface side of the hydraulic oil stored in the valve chamber 100 is divided into a region in which the inflow port 131 is provided and a region in which the exhaust port 121 is provided, the inflow port 131 is used. By the time the hydraulic oil that has flowed into the valve chamber 100 is discharged from the discharge port 121, it heads to the lower side of the temporarily stored hydraulic oil, passes through the passage 119, and then rises to reach the discharge port 121. Become. Therefore, the working oil having a low oil temperature does not stay below the stored working oil, and variation in the temperature in the valve chamber 100 is suppressed. As a result, the delay in warm-up of the solenoid valve or the like is suppressed.

  In FIG. 7, as a reference example, the inlet 131 and the outlet 121 are provided above the valve chamber 100, but are provided below the height position of the inlet 131 and the height position of the outlet 121. It is explanatory drawing which shows the flow of the hydraulic fluid in the case of the valve chamber 100 which is not provided with the hydraulic fluid passage.

  For example, at the time of cold start, the oil temperature of the hydraulic oil stored in the valve chamber 100 is low, and the hydraulic oil that circulates in the transmission case of the automatic transmission 2 as time passes after the engine 1 is started. Oil temperature rises. However, among the stored hydraulic oil, the low-temperature hydraulic oil easily sinks to the lower side, so the warmed hydraulic oil flowing into the valve chamber 100 through the inflow port 131 flows near the oil surface OL and is discharged. Only the hydraulic oil that is discharged from 121 and has a high oil temperature is circulated. As a result, the oil temperature of the hydraulic oil in the region close to the oil level OL of the hydraulic oil in the valve chamber 100 rises, while the low-temperature hydraulic oil sinks downward and stays, causing variations in the oil temperature. Become. As a result, a delay in warming up the solenoid valve 50 immersed in the hydraulic oil in the valve chamber 100 may occur.

  On the other hand, FIG. 8 is an explanatory diagram showing the flow of hydraulic oil in the valve chamber 100 of the automatic transmission 2 according to the present embodiment. In the automatic transmission device 2 according to the present embodiment, it is provided in the valve chamber 100 below the height position of the inflow port 131 and the height position of the exhaust port 121, and is provided in the valve chamber 100 via the inflow port 131. A passage 119 is formed through which the hydraulic oil that flows in and is discharged through the discharge port 121 passes. The passage 119 is preferably provided at least below the solenoid valve 20. The term "below the solenoid valve 20" as used herein also includes the case where the height position of the passage 119 is equal to the height position of the solenoid valve 20.

  Therefore, when the relatively high temperature hydraulic oil flowing into the valve chamber 100 via the inflow port 131 is discharged from the discharge port 121, it always passes through the lower passage 119. Therefore, the low-temperature hydraulic oil does not stay below, and variations in the oil temperature of the hydraulic oil in the valve chamber 100 are suppressed. As a result, it is possible to prevent delay in warm-up of the solenoid valve 50 immersed in the hydraulic oil in the valve chamber 100.

  As described above, the automatic transmission 2 according to the present embodiment is configured so that the hydraulic oil flowing into the valve chamber 100 through the inflow port 131 once passes through the lower passage 119, and It is possible to suppress variation in the oil temperature of the hydraulic oil in the chamber 100. Therefore, even if the solenoid valve 50 is immersed in the lower side of the valve chamber 100, it is possible to prevent the delay of warm-up of the solenoid valve 50.

  In addition, the passage 119 can be easily formed by providing a partition wall in the valve chamber 100. Further, the flow of hydraulic oil that passes through the passage 119 can be formed by the flow of hydraulic oil in the mission case without using a separate pump or the like. Therefore, according to the present embodiment, it is possible to easily suppress the variation in the oil temperature in the vertically installed valve chamber 100.

  It is not essential to provide the case-side partition 111 and the cover-side partition 153 when providing the partition in the valve chamber 100. For example, the partition may be raised only from the recess 110 of the first case 10, Alternatively, the partition wall may be raised only from the inner surface of the cover 150. Further, the passage 119 is provided below the height position of the inflow port 131 and the height position of the exhaust port 121, and flows into the valve chamber 100 through the inflow port 131 and exhausts through the exhaust port 121. There is no limitation on how to form the hydraulic oil as long as it is configured to pass through.

  Further, since the variation in the oil temperature of the hydraulic oil in the valve chamber 100 is suppressed, the difference between the oil temperature of the hydraulic oil around the solenoid valve 50 and the oil temperature of the hydraulic oil in the main valve chamber 90 is small. Become. Therefore, without providing a temperature sensor in the valve chamber 100, control is performed while correcting the control characteristic of the solenoid valve 50 in the valve chamber 100 based on the oil temperature detected by the thermistor 95 provided in the main valve chamber 90. can do. For example, the transmission control device refers to a correction map in which the relationship between the oil temperature and the correction amount of the solenoid valve 50 is preset based on the oil temperature detected by the thermistor 95 provided in the main valve chamber 90, and the electromagnetic control is performed. The control amount of the valve 50 may be corrected.

<3. Modification>
Up to this point, the automatic transmission 2 according to the present embodiment has been described. The configuration of the automatic transmission 2 according to the present embodiment is not limited to the above-described aspect, and various modifications can be made. Hereinafter, a modified example of the automatic transmission 2 will be described.

  FIG. 9 is a side view of a mission case (first case 10) of the automatic transmission according to the modification. In the automatic transmission according to the modification, not only the partition wall 141 arranged in the valve chamber 100 in the vertical direction (vertical direction) but also from the partition wall 141 in the lateral direction toward the region where the inflow port 131 is provided. An extending partition 143 is provided. The partition wall 143 is provided with a plurality of passage holes 145. The solenoid valve 50 of the hydraulic control valve unit 60 provided in the valve chamber 100 is arranged in a region in which the inflow port 131 is provided among the two regions partitioned by the partition walls 141 and 143.

  The partition wall 143 allows the hydraulic oil that has flowed into the valve chamber 100 through the inflow port 131 to pass therethrough, but can provide resistance to the flow of the hydraulic oil. Therefore, as shown in FIG. 10, the hydraulic oil that has flowed into the valve chamber 100 through the inflow port 131 does not form a constant flow toward the passage 119, and flows on the upstream side of the partition wall 143. It becomes easy to disperse in the region where the inlet 131 is provided. For this reason, variations in the oil temperature of the hydraulic oil within the region where the solenoid valve 50 is arranged are more easily suppressed.

  The mode of the passage hole 145 of the partition wall 143 is not particularly limited. For example, the size and shape of the passage hole 145 may be appropriately selected. Further, the passage hole 145 may be an opening provided in the partition wall 143, or may be formed by a groove or slit provided at an end of the partition wall 143 and the inner peripheral surface of the cover 150.

<4. Summary>
As described above, the automatic transmission 2 according to the present embodiment includes the hydraulic oil inlet 131 and the discharge outlet 121 above the vertical valve chamber 100 in which the hydraulic control valve unit 60 is vertically mounted. Therefore, the solenoid valve 50 included in the hydraulic control valve unit 60 mounted in the valve chamber 100 can always be immersed in the hydraulic oil stored in the valve chamber 100.

  Further, the automatic transmission 2 has a passage 119 below the inside of the valve chamber 100 through which the hydraulic oil flowing into the valve chamber 100 through the inflow port 131 and discharged from the discharge port 121 passes. Therefore, the hydraulic oil always moves to the lower side and then rises and is discharged from the discharge port 121. For this reason, for example, even at the time of cold start, the low-temperature hydraulic oil does not sink and stay in the lower side of the valve chamber 100, and the variation of the oil temperature of the hydraulic oil in the valve chamber 100 is suppressed. You can As a result, it is possible to prevent the delay in warm-up of the solenoid valve 50 from occurring.

  Although the preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various alterations or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above-described embodiment, the main valve chamber 90 in which the main hydraulic control valve unit is accommodated horizontally is provided at the bottom of the mission case (third case 30), and the mission case (first case 10) is provided. Although the valve chamber 100 in which another hydraulic control valve unit is vertically installed is provided on the side surface of the above, the present invention is not limited to this example. For example, all hydraulic control valve units that control the hydraulic pressure supplied to the clutches and pulleys of the automatic transmission 2 are vertically arranged in a valve chamber provided on the side surface of the transmission case. The present invention can also be applied. In this case, at least the electromagnetic valve included in the hydraulic control valve unit may be provided with the inlet and the outlet so as to be immersed in the hydraulic oil, and the passage may be provided below the valve chamber. Even in such an automatic transmission, at least the electromagnetic valve is constantly immersed in the hydraulic oil, the variation in the oil temperature of the hydraulic oil in the valve chamber is suppressed, and the delay in warm-up of the electromagnetic valve can be prevented.

  Further, in the above embodiment, the automatic transmission 2 mounted on the hybrid vehicle has been described as an example, but the present invention is not limited to this example. The automatic transmission may be an automatic transmission installed in a vehicle that includes only an engine as a device that generates a driving force of the vehicle.

1 Engine 2 Automatic Transmission 3 Transmission Mechanism 4 Motor 10 Mission Case (First Case)
20 mission case (second case)
30 mission case (3rd case)
50 Solenoid valve 60 Hydraulic control valve unit 90 Main valve chamber (horizontal valve chamber)
100 valve chamber (vertical valve chamber)
110 recessed part 111 case side partition wall 119 passage way 121 discharge port 131 inlet port 150 cover 153 cover side partition wall OL oil level

Claims (5)

A mission case accommodating at least a part of the power unit of the vehicle,
A valve chamber provided on the side surface of the mission case, in which the hydraulic control valve unit is vertically installed,
An inlet for introducing hydraulic oil into the valve chamber,
A discharge port for discharging the hydraulic oil from the valve chamber,
The hydraulic oil, which is provided below the height position of the inlet and the height position of the discharge port, flows into the valve chamber through the flow inlet and is discharged through the discharge port. A passageway,
Equipped with
An automatic transmission in which the inlet and the outlet are provided at least above a height position of an electromagnetic valve included in the hydraulic control valve unit, and the passage is provided below the electromagnetic valve . A mission case accommodating at least a part of the power unit of the vehicle,
A valve chamber provided on the side surface of the mission case, in which the hydraulic control valve unit is vertically installed,
An inlet for introducing hydraulic oil into the valve chamber,
A discharge port for discharging the hydraulic oil from the valve chamber,
The hydraulic oil, which is provided below the height position of the inlet and the height position of the discharge port, flows into the valve chamber through the flow inlet and is discharged through the discharge port. A passageway,
Equipped with
The valve chamber is formed by attaching a cover to the outer peripheral surface of the mission case, and the passage is formed by a partition wall provided between the outer peripheral surface of the mission case and the inner peripheral surface of the cover. , automatic transmission. The automatic transmission according to claim 2 , wherein the partition wall is provided on at least one of an outer peripheral surface of the mission case and an inner surface of the cover. The automatic transmission is a transmission for a hybrid vehicle,
The hydraulic control valve unit is a first hydraulic control valve unit that controls connection and disconnection of a motor clutch that switches whether to transmit power of a driving force generation motor of the vehicle,
The automatic transmission, on the bottom of the transmission case, comprising a main valve chamber which second hydraulic control valve unit which controls the controlled object other than at least the motor clutch is accommodated transversely claim 1-3 The automatic transmission according to any one of 1. The automatic transmission according to claim 4 , wherein in the automatic transmission, the control characteristic of the first hydraulic control valve unit is set according to the temperature of the hydraulic oil flowing through the main valve chamber.

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