JP2012211611A - Lubricating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating device capable of carrying out lubrication properly using micro-bubbles.SOLUTION: A lubricating device 1 includes: a discharge port 33 that is provided in a control valve 30 for controlling a liquid medium supplied to a power transmission device transmitting power from a drive source 3 for travelling to a drive wheel of a vehicle, and that generates micro-bubbles in the liquid medium by reducing a pressure of the liquid medium when the liquid medium is discharged from the control valve 30; and a micro-bubble-medium mixture supply passage 34 that connects the discharge port 33 to a frictional engagement element 18, 19 of the power transmission device. The lubricating device exhibits an effect capable of carrying out lubrication properly using the micro-bubbles.

Description

  The present invention relates to a lubricating device.

  As a conventional lubrication device applied to a power transmission device such as a vehicle, for example, in Patent Document 1, air is mixed in lubricating oil by a swirling flow type microbubble generator to generate microbubbles. A lubricating device using microbubbles has been disclosed in which a lubricating oil mixed with bubbles is supplied to a wet multi-plate clutch and lubricated to reduce drag torque in the wet multi-plate clutch.

JP 2010-71420 A

  By the way, the lubricating device using the microbubble described in Patent Document 1 as described above has room for further improvement in terms of a configuration for generating microbubbles and supplying them to the wet multi-plate clutch.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lubrication apparatus capable of appropriately performing lubrication using fine bubbles.

  In order to achieve the above object, a lubricating device according to the present invention is provided in a control valve that controls a liquid medium supplied to a power transmission device that transmits power from a driving source for driving a vehicle to driving wheels. A discharge port for generating fine bubbles in the liquid medium by decompression when the liquid medium is discharged from the medium, and a fine bubble mixed medium supply passage connecting the discharge port and the friction engagement element of the power transmission device It is characterized by providing.

  Further, in the lubricating device, when the pressure in the fine bubble mixed medium supply passage is equal to or higher than a preset predetermined pressure, the fine bubble mixed medium supply passage is provided in the fine bubble mixed medium supply passage. A discharge device for discharging the liquid medium from the inside to the outside may be provided.

  Further, the lubrication apparatus may include a switching device that prohibits the supply of the liquid medium mixed with the fine bubbles to the friction engagement element according to the state of the vehicle.

  In the lubricating device, the switching device may prohibit the supply of the liquid medium mixed with the fine bubbles to the friction engagement element during the engagement operation of the friction engagement element. .

  In the lubricating device, the switching device supplies the liquid medium mixed with the fine bubbles to the friction engagement element when the rotational speed of the friction engagement element is equal to or higher than a predetermined speed set in advance. Can be prohibited.

  In the lubricating device, the switching device may be operated according to a pressure difference between a primary pressure and a secondary pressure of a belt type continuously variable transmission that performs a speed change operation according to the pressure of the liquid medium. it can.

  Further, the lubrication apparatus includes a switching supply passage capable of supplying the liquid medium to the friction engagement element without passing through the discharge port, and the switching apparatus includes the liquid medium mixed with the fine bubbles. When the supply to the friction engagement element is prohibited, the passage for supplying the liquid medium to the friction engagement element may be switched from the fine bubble mixed medium supply passage to the switching supply passage.

  The lubrication apparatus according to the present invention has an effect that lubrication using fine bubbles can be performed appropriately.

FIG. 1 is a schematic configuration diagram of a vehicle on which the lubricating device according to the first embodiment is mounted. FIG. 2 is a schematic configuration diagram of the lubricating device according to the first embodiment. FIG. 3 is a schematic configuration diagram of a lubricating device according to the second embodiment. FIG. 4 is a schematic configuration diagram of a lubricating device according to the third embodiment. FIG. 5 is a schematic configuration diagram of a lubricating device according to the fourth embodiment. FIG. 6 is a cross-sectional view of a schematic configuration diagram of a lubricating device according to a fifth embodiment. FIG. 7 is a flowchart illustrating an example of switching control in the lubrication apparatus according to the fifth embodiment. FIG. 8 is a schematic configuration diagram of a lubricating device according to the sixth embodiment. FIG. 9 is a diagram showing an example of the relationship between the clutch rotational speed and the drag torque. FIG. 10 is a flowchart illustrating an example of switching control in the lubricating device according to the sixth embodiment. FIG. 11 is a schematic configuration diagram of a lubricating device according to the seventh embodiment. FIG. 12 is a diagram showing an example of the relationship between the clutch rotational speed and the drag torque.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment 1]
FIG. 1 is a schematic configuration diagram of a vehicle equipped with a lubricating device according to the first embodiment, and FIG. 2 is a schematic configuration diagram of the lubricating device according to the first embodiment.

  For example, as shown in FIG. 1, the lubrication apparatus 1 of this embodiment is incorporated in a hydraulic control circuit of a hydraulic control apparatus 6 that controls the pressure of oil as a liquid medium supplied to the power transmission apparatus 5 of the vehicle 2. The power transmission device 5 is lubricated at a predetermined location.

  A vehicle 2 to which the lubrication device 1 is applied includes an engine 3 as a driving source for driving, a drive wheel 4, a power transmission device 5, a hydraulic control device 6, and an ECU 7 as a control device.

  The engine 3 is a driving source (prime mover) that drives the vehicle 2, and generates power that consumes fuel and acts on the driving wheels 4 of the vehicle 2. The engine 3 can generate mechanical power (engine torque) on the crankshaft 8 that is an engine output shaft as the fuel burns, and can output this mechanical power from the crankshaft 8 toward the drive wheels 4. .

  The power transmission device 5 transmits power from the engine 3 to the drive wheels 4. The power transmission device 5 is provided in the power transmission path from the engine 3 to the drive wheel 4 and is operated by the pressure (hydraulic pressure) of oil as a liquid medium.

  More specifically, the power transmission device 5 includes a torque converter 9, a forward / reverse switching mechanism 10, a transmission 11, a reduction mechanism 12, a differential gear 13, and the like. In the power transmission device 5, the crankshaft 8 of the engine 3 and the input shaft 14 of the transmission 11 are connected via the torque converter 9, the forward / reverse switching mechanism 10, etc., and the output shaft 15 of the transmission 11 is connected to the speed reduction mechanism 12. It is connected to the drive wheel 4 via the differential gear 13 and the drive shaft 16.

  The torque converter 9 amplifies the torque transmitted to the front cover coupled to the crankshaft 8 so as to be rotatable integrally with the crankshaft 8 via a fluid transmission mechanism including a pump and a turbine, or via a lock-up clutch. The torque is transmitted to the forward / reverse switching mechanism 10 with the torque as it is. In the torque converter 9, the lockup clutch is switched between the released state (lockup OFF) and the engaged state (lockup ON) according to the pressure of oil supplied from a hydraulic control device 6 described later.

  The forward / reverse switching mechanism 10 can shift the power (rotation output) from the engine 3 and can switch the rotation direction thereof. The forward / reverse switching mechanism 10 includes a planetary gear mechanism 17, a forward / reverse switching clutch (forward clutch) 18 as a friction engagement element, a forward / reverse switching brake (reverse brake) 19, and the like. The planetary gear mechanism 17 is a differential mechanism that includes a sun gear, a ring gear, a carrier, and the like as a plurality of rotational elements that can be differentially rotated with each other. The forward / reverse switching clutch 18 and the forward / reverse switching brake 19 include: This is an engagement element for switching the operating state of the planetary gear mechanism 17 and can be constituted by, for example, a frictional engagement mechanism such as a multi-plate clutch. Here, a hydraulic wet multi-plate clutch is used. .

  In the forward / reverse switching mechanism 10, the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are operated by the pressure of oil supplied from a hydraulic control device 6 described later, and the operating state is switched. When the forward / reverse switching clutch 18 is in the engaged state (ON state) and the forward / reverse switching brake 19 is in the released state (OFF state), the forward / reverse switching mechanism 10 rotates the power from the engine 3 in the normal rotation (vehicle 2 Is transmitted to the input shaft 14 in the direction in which the input shaft 14 rotates as the vehicle advances. When the forward / reverse switching clutch 18 is in the released state and the forward / reverse switching brake 19 is in the engaged state, the forward / reverse switching mechanism 10 rotates the power from the engine 3 in the reverse rotation (when the vehicle 2 moves backward, the input shaft 14 In the direction of rotation). In the forward / reverse switching mechanism 10, both the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are released during neutral.

  The transmission 11 is provided between the forward / reverse switching mechanism 10 and the drive wheel 4 in the power transmission path from the engine 3 to the drive wheel 4 and can shift and output the power of the engine 3. The transmission 11 is operated by the pressure of oil supplied from a hydraulic control device 6 described later.

  The transmission 11 shifts the rotational power (rotational output) from the engine 3 transmitted (input) to the input shaft 14 at a predetermined speed ratio and transmits it to the output shaft 15 which is a transmission output shaft. The power shifted from 15 toward the drive wheel 4 is output. Here, as an example, the transmission 11 includes a primary pulley 20 coupled to an input shaft (primary shaft) 14, a secondary pulley 21 coupled to an output shaft (secondary shaft) 15, a primary pulley 20 and a secondary pulley 21. 1 illustrates a belt-type continuously variable automatic transmission (CVT) including a belt 22 and the like that are stretched between the two. The transmission 11 shifts according to the pressure (primary pressure, secondary pressure) of oil supplied from the hydraulic control device 6 described later to the primary sheave hydraulic chamber 23 of the primary pulley 20 and the secondary sheave hydraulic chamber 24 of the secondary pulley 21. A speed ratio which is a ratio between an input rotational speed (primary rotational speed) corresponding to the input rotational speed of the primary pulley 20 and an output shaft rotational speed (secondary rotational speed) corresponding to the output rotational speed of the secondary pulley 21 is performed. The stepless change is made, and the force (belt clamping pressure) by which the secondary pulley 21 or the like clamps the belt 22 is adjusted, and the power is transmitted with a torque capacity corresponding to this.

  The speed reduction mechanism 12 reduces the rotational speed of the power from the transmission 11 and transmits it to the differential gear 13. The differential gear 13 transmits the power from the speed reduction mechanism 12 to each drive wheel 4 via each drive shaft 16. The differential gear 13 absorbs the difference in rotational speed between the center side of the turning, that is, the inner driving wheel 4 and the outer driving wheel 4 that occurs when the vehicle 2 turns.

  The power transmission device 5 configured as described above transmits power generated by the engine 3 to the drive wheels 4 via the torque converter 9, the forward / reverse switching mechanism 10, the transmission 11, the speed reduction mechanism 12, the differential gear 13, and the like. Can communicate. As a result, the driving force [N] is generated on the contact surface of the driving wheel 4 with the road surface, and the vehicle 2 can travel by this.

  The hydraulic control device 6 includes a power transmission device 5 including engagement elements such as a lockup clutch of the torque converter 9, a forward / reverse switching clutch 18 of the forward / reverse switching mechanism 10, and a forward / reverse switching brake 19, depending on the hydraulic pressure of oil as a fluid. It is to be operated. The hydraulic control device 6 includes, for example, various hydraulic control circuits that are controlled by the ECU 7. The hydraulic control device 6 is configured to include a plurality of oil passages, an oil reservoir, an oil pump, a plurality of electromagnetic valves, and the like, and in accordance with signals from the ECU 7 described later, the oil control unit 6 supplies oil to each part of the power transmission device 5. Control the flow rate or hydraulic pressure. The hydraulic control device 6 also functions as a lubricating oil supply device that lubricates predetermined portions of the power transmission device 5 as will be described later.

  The ECU 7 controls driving of each part of the vehicle 2. The ECU 7 is an electronic circuit mainly composed of a known microcomputer including a CPU, a ROM, a RAM, and an interface. For example, the ECU 7 is electrically connected to various sensors and detection devices provided in each part of the vehicle 2. The ECU 7 is electrically connected to a fuel injection device, an ignition device, a throttle device, a hydraulic control device 6 and the like of the engine 3. The ECU 7 receives electric signals corresponding to detection results detected from various sensors, and outputs drive signals to these units in accordance with the input detection results to control their drive. For example, the ECU 7 adjusts the throttle opening based on the accelerator opening, the vehicle speed, etc., adjusts the amount of intake air to the engine 3, controls the fuel injection amount in response to the change, and fills the combustion chamber. The output of the engine 3 is controlled by adjusting the amount of air-fuel mixture. Further, the ECU 7 controls the speed change of the transmission 11 by adjusting the gear ratio, typically the input rotation speed to the transmission 11 based on the accelerator opening, the vehicle speed, and the like.

  By the way, as shown in FIG. 2, the lubricating device 1 configured to be incorporated in the hydraulic control circuit of the hydraulic control device 6 of the present embodiment serves as a discharge port for generating fine bubbles in oil as a liquid medium. A drain 33; a forward / reverse switching clutch 18 serving as a friction engagement element of the drain 33 and the power transmission device 5; and a supply oil path 34 serving as a fine bubble mixed medium supply passage for connecting the forward / reverse switching brake 19 to each other. Thus, lubrication using fine bubbles can be performed appropriately.

  Here, the hydraulic control device 6 in which the lubricating device 1 is incorporated includes various control valves such as an oil pan 25, an oil pump 26, a primary regulator valve 27, a secondary regulator valve 28, a line pressure control valve 29, and a sheave pressure control valve 30. The various control valves, the primary sheave hydraulic chamber 23, the secondary sheave hydraulic chamber 24, the lockup clutch of the torque converter 9, the forward / reverse switching clutch 18, the clutch hydraulic chambers 31, 32 for operating the forward / reverse switching brake 19, etc. The various parts of the power transmission device 5 are configured to include various oil passages and the like that mutually connect oil so that oil can flow therethrough.

  The oil pan 25 is a storage means and stores oil as a liquid medium. The oil pump 26 is driven in synchronism with the rotation of the crankshaft 8 (see FIG. 1) of the engine 3, and sucks, pressurizes, and discharges the oil stored in the oil pan 25. Here, the oil pump 26 is described as using the engine 3 as a drive source. However, the present invention is not limited to this, and an electric motor or the like may be used as the drive source.

  The primary regulator valve 27 and the secondary regulator valve 28 regulate the first line pressure. For example, the first line pressure is a pressure having a predetermined magnitude according to a solenoid pressure input from a solenoid valve (not shown). Adjust to. The first line pressure is the original pressure of oil in the entire hydraulic control circuit of the hydraulic control device 6 that controls the oil supplied to the power transmission device 5. The primary regulator valve 27 has a spool valve element and a plurality of ports (input port, output port, drain port, etc., the same applies hereinafter). For example, the discharge port of the oil pump 26 is connected to the input port, and the output port The input port of the secondary regulator valve 28, each part lubrication hole, etc. are connected to. Further, the primary regulator valve 27 is connected to a lock-up clutch of the torque converter 9 via a lock-up control valve (not shown) for controlling the lock-up pressure, for example, at the output port. The secondary regulator valve 28 has a spool valve element and a plurality of ports. For example, the output port of the primary regulator valve 27 is connected to the input port, and the suction port of the oil pump 26 is connected to the output port.

  The line pressure control valve 29 adjusts the second line pressure. For example, the line pressure control valve 29 adjusts the second line pressure to a predetermined pressure or higher. The second line pressure is the original pressure of oil introduced into a clutch control valve (not shown) for controlling the clutch pressure introduced into each clutch hydraulic chamber 31, 32. The line pressure control valve 29 has a spool valve element and a plurality of ports. For example, the discharge port of the oil pump 26 is connected to the input port, and each clutch hydraulic chamber is connected to the output port via a clutch control valve (not shown). 31, 32, etc. are connected.

  The sheave pressure control valve 30 controls the sheave pressure. The sheave pressure is the pressure (primary pressure, secondary pressure) of oil supplied to the primary sheave hydraulic chamber 23 or the secondary sheave hydraulic chamber 24. The sheave pressure control valve 30 has a spool valve element and a plurality of ports. For example, the discharge port of the oil pump 26 is connected to the input port, and the primary sheave hydraulic chamber 23 is connected to the output port via a control valve (not shown). The secondary sheave hydraulic chamber 24 and the like are connected.

  The hydraulic control device 6 configured as described above is arranged in the clutch sheaves 31 and 32 through the line pressure control valve 29 and the clutch pressure control valve (not shown), and the like through the sheave pressure control valve 30 and the like. Oil of a predetermined pressure is supplied as hydraulic oil to the hydraulic chamber 23 and the secondary sheave hydraulic chamber 24 to the lockup clutch of the torque converter 9 via the primary regulator valve 27, a lockup control valve (not shown), and the like.

  The drain 33 of the lubricating device 1 of the present embodiment is a control valve that controls oil supplied to the power transmission device 5 in the hydraulic control device 6, typically, the oil pressure of the introduced oil is relatively high. As an example, the sheave pressure control valve 30 is provided with a control valve that can secure a sufficient amount of pressure reduction to generate fine bubbles. The drain 33 generates fine bubbles in the oil by reducing the pressure when the oil is discharged from the sheave pressure control valve 30.

  The microbubble here is typically a microbubble having a diameter of several tens of μm or less, that is, a so-called microbubble. is there. The microbubbles are difficult to merge and absorb, tend to float in the liquid for a long time, and eventually disappear while dissolving in the liquid oil. The fine bubbles may be, for example, so-called nanobubbles having a diameter of 1 μm or less.

  The supply oil passage 34 of the lubrication apparatus 1 connects the drain (drain port) 33 of the sheave pressure control valve 30 to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. The supply oil passage 34 supplies oil mixed with fine bubbles generated when discharged from the drain 33 to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  In the lubricating device 1 configured as described above, oil is discharged from the drain 33 of the sheave pressure control valve 30, and fine bubbles are generated in the oil due to the rapid pressure reduction at this time. The lubricating device 1 can supply the oil mixed with the fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the supply oil passage 34. As a result, the lubrication apparatus 1 can properly lubricate and cool the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 with oil mixed with fine bubbles, so the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 The drag torque generated in the engine can be reduced, so that, for example, power loss can be reduced and fuel consumption can be improved.

  Then, the lubricating device 1 uses, for example, oil mixed with fine bubbles generated by using an existing control valve such as the sheave pressure control valve 30 through the supply oil passage 34, and the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 Since there is no need to separately provide a fine bubble generating device in order to generate fine bubbles, it is possible to suppress an increase in the number of components. As a result, the lubrication apparatus 1 can realize a configuration that performs lubrication using fine bubbles in a small space and at a low cost.

  Further, the lubrication apparatus 1 supplies oil mixed with fine bubbles generated by using an existing control valve such as the sheave pressure control valve 30 to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the supply oil passage 34. Since this configuration does not require a pump, pressure adjusting unit, compressor, or the like for generating fine bubbles, an increase in energy loss due to the generation of fine bubbles can be suppressed. Loss can be reduced and fuel consumption can be improved.

  The lubricating device 1 supplies oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 via the supply oil passage 34 without passing through the oil pump 26 or a filter (not shown). As a result, it is possible to suppress a reduction in the amount of air bubbles in the oil before being supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, and a sufficient amount of fine bubbles can be removed. 18, and can be supplied to the forward / reverse switching brake 19. Furthermore, the lubrication apparatus 1 can prevent the air pumping and the like in the oil pump 26 and can suppress an increase in pump load, a decrease in pump efficiency, and the like. Can be improved.

  According to the lubricating device 1 according to the embodiment described above, the sheave pressure control valve 30 that controls oil supplied to the power transmission device 5 that transmits power from the engine 3 of the vehicle 2 to the drive wheels 4 is provided in the sheave. A drain 33 that generates fine bubbles in the oil by reducing the pressure when the oil is discharged from the pressure control valve 30 is connected to the drain 33, the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 of the power transmission device 5. And a supply oil passage 34.

  Therefore, the lubricating device 1 generates fine bubbles in the oil due to the rapid pressure reduction when the oil is discharged from the drain 33 of the sheave pressure control valve 30, and supplies the oil mixed with the fine bubbles to the supply oil passage 34. Therefore, for example, lubrication using fine bubbles can be properly performed with a simpler configuration.

  In the above description, the supply oil passage 34 is described as connecting the drain 33 of the sheave pressure control valve 30, the forward / reverse switching clutch 18, and the forward / reverse switching brake 19, but the present invention is not limited thereto. The discharge port to which the supply oil passage 34 is connected may be a discharge port that generates fine bubbles by decompression when oil is discharged from the control valve. If fine bubbles are generated when oil is discharged, for example, The drain of the line pressure control valve 29 may be used. The friction engagement element connected to the supply oil passage 34 is not limited to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 of the forward / reverse switching mechanism 10, but may be a friction engaging element included in the power transmission device 5. Other things may be used.

[Embodiment 2]
FIG. 3 is a schematic configuration diagram of a lubricating device according to the second embodiment. The lubricating device according to the second embodiment is different from the first embodiment in that it includes a discharging device. In addition, about the structure, an effect | action, and effect which are common in embodiment mentioned above, the overlapping description is abbreviate | omitted as much as possible (the embodiment described below is also the same).

  As shown in FIG. 3, the lubrication apparatus 201 according to the present embodiment includes a drain 33 and a supply oil passage 34, and further includes a check valve 235 as a discharge device.

  The check valve 235 is provided in the supply oil passage 34. That is, the check valve 235 is provided in the supply oil passage 34 between the drain (drain port) 33 of the sheave pressure control valve 30 and the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  The check valve 235 discharges oil from the inside of the supply oil passage 34 to the outside when the pressure in the supply oil passage 34 becomes equal to or higher than a predetermined pressure set in advance. The check valve 235 opens when the pressure in the supply oil passage 34 is equal to or higher than a predetermined valve opening pressure, and discharges oil out of the system.

  According to the lubricating device 201 according to the embodiment described above, fine bubbles are generated in the oil due to the rapid pressure reduction when the oil is discharged from the drain 33 of the sheave pressure control valve 30, and the fine bubbles are mixed. The oil is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements through the supply oil passage 34. Therefore, for example, lubrication using fine bubbles is appropriately performed with a simpler configuration. be able to.

  The lubrication device 201 is provided in the supply oil passage 34 and discharges oil from the inside of the supply oil passage 34 to the outside when the pressure in the supply oil passage 34 exceeds a predetermined pressure set in advance. A check valve 235 is provided. Accordingly, since the lubricating device 201 discharges oil from the check valve 235 when the supply oil passage 34 becomes equal to or higher than a predetermined value, it is possible to prevent the circuit oil pressure of the supply oil passage 34 and the like from rising excessively. . As a result, the lubricating device 201 can suppress, for example, a decrease in the control response of the sheave pressure by the sheave pressure control valve 30 and can suppress a decrease in the shift response, that is, the power A decrease in controllability of the transmission device 5 can be suppressed.

[Embodiment 3]
FIG. 4 is a schematic configuration diagram of a lubricating device according to the third embodiment. The lubricating device according to the third embodiment is different from the first and second embodiments in that it includes a switching device.

  As shown in FIG. 4, the lubricating device 301 according to the present embodiment includes a drain 33, a supply oil passage 34, a check valve 235, a switching oil passage 336 as a switching supply passage, and a manual as a switching device. And a valve 337.

  The switching oil passage 336 can supply oil to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 without using the drain 33 that generates fine bubbles. The switching oil passage 336 is formed separately as an oil passage different from the supply oil passage 34. The switching oil passage 336 is connected to the output port of the secondary regulator valve 28 and also joins the branch oil passage from the output port of the line pressure control valve 29.

  The manual valve 337 is connected to the supply oil passage 34 and the switching oil passage 336, and one is connected to the lubrication hole of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 depending on the situation, and the other is connected to the drain. It is.

  The manual valve 337 connects the supply oil passage 34 to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 when supplying oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. On the other hand, the switching oil passage 336 is connected to the drain. Thereby, the lubricating device 301 can supply the oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the supply oil passage 34.

  When the manual valve 337 supplies oil not mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, the manual oil valve 337 serves as a lubricating hole for the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. On the other hand, the supply oil passage 34 is connected to the drain. As a result, the lubrication device 301 prohibits the supply of the oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, and forwards the oil not mixed with fine bubbles through the switching oil passage 336. The switching clutch 18 and the forward / reverse switching brake 19 can be supplied.

  The manual valve 337 prohibits the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2. The manual valve 337 supplies oil to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as described above when prohibiting the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. The supply passage is switched from the supply oil passage 34 to the switching oil passage 336.

  The manual valve 337 switches the supply oil path 34 and the switching oil path 336 according to the engagement state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as the state of the vehicle 2. Here, the manual valve 337 prohibits the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. . When the driver performs a shift range operation via the shift lever, the manual valve 337 of the present embodiment switches the passage mechanically in conjunction with the shift range operation.

  The manual valve 337 connects the supply oil passage 34 to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 when the drive range (D range) for forward travel is selected as the shift range. Set to Thereby, the lubrication device 301 can supply the oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the supply oil passage 34 when the drive range is selected as the shift range. it can. As a result, the lubricating device 301 can reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  On the other hand, in the manual valve 337, the driver performs a shift range operation via the shift lever from the state where the drive range is selected, and other ranges (for example, a parking range, a reverse range, a neutral range, etc.) are used as the shift range. Is selected, the passage for supplying oil to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is switched from the supply oil passage 34 to the switching oil passage 336 in conjunction with the shift range operation. As a result, the lubrication device 301 is mixed with fine bubbles during the engagement operation of at least the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, that is, during clutch engagement control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. The oil is prohibited from being supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, and the oil free of fine bubbles is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the switching oil passage 336. be able to.

  According to the lubricating device 301 according to the embodiment described above, fine bubbles are generated in the oil due to rapid pressure reduction when the oil is discharged from the drain 33 of the sheave pressure control valve 30, and the fine bubbles are mixed. The oil is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements through the supply oil passage 34. Therefore, for example, lubrication using fine bubbles is appropriately performed with a simpler configuration. be able to.

  The lubrication device 301 includes a manual valve 337 for prohibiting supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2. The lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be appropriately switched according to the state of the vehicle 2 by the valve 337.

  That is, in the lubricating device 301, the manual valve 337 supplies oil mixed with fine bubbles during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Therefore, during the clutch engagement control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, the surface characteristics such as the friction characteristics (μ characteristics) and the oil film characteristics of the friction engagement surface fluctuate due to fine bubbles. Can be suppressed. As a result, the lubricating device 301 suppresses the occurrence of so-called judder and slip in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 during the clutch fastening control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. be able to.

  In addition, the lubrication apparatus 301 can realize a configuration in which, for example, an existing manual valve 337 is used to prohibit supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Therefore, the lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be switched reliably at low cost according to the shift range operation. That is, the lubrication device 301 can supply oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 after the switching to the drive range is completed. It is possible to surely prevent the oil mixed with the fine bubbles from being supplied during the engaging operation 19.

[Embodiment 4]
FIG. 5 is a schematic configuration diagram of a lubricating device according to the fourth embodiment. The lubricating device according to the fourth embodiment is different from the third embodiment in the configuration of the switching device.

  As shown in FIG. 5, the lubricating device 401 according to the present embodiment includes a drain 33, a supply oil passage 34, a check valve 235, a switching oil passage 336 as a switching supply passage, and a shift as a switching device. And a valve 437.

  The shift valve 437 is connected to the supply oil passage 34 and the switching oil passage 336, and one is connected to the lubrication hole of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 depending on the situation, and the other is connected to the drain. It is. The shift valve 437 prohibits the supply of the oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2.

  The shift valve 437 switches the supply oil passage 34 and the switching oil passage 336 as the state of the vehicle 2 according to the engagement state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. The shift valve 437 prohibits the supply of the oil mixed with fine bubbles during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. The shift valve 437 of the present embodiment switches the passage in conjunction with oil supply / discharge of the clutch hydraulic chambers 31 and 32, that is, in conjunction with the engagement / disengagement operation of the forward / reverse switching brake 19. For example, the shift valve 437 switches the passage according to the magnitude relationship between the hydraulic pressure that fluctuates in conjunction with the supply and discharge of oil to and from the clutch hydraulic chambers 31 and 32 and the urging force of the spring.

  The shift valve 437 lubricates the supply oil passage 34 through the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 when the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are completely engaged or completely released. Set to connect to the hole. As a result, the lubrication device 401 allows the forward / reverse switching clutch 18 to switch the forward / reverse switching clutch 18 when the forward / reverse switching brake 19 is in the fully engaged state or in the fully released state. The brake 19 can be supplied. As a result, the lubricating device 401 can reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  On the other hand, the shift valve 437 is connected to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 when the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are engaged. The passage for supplying oil is switched from the supply oil passage 34 to the switching oil passage 336. As a result, in the lubricating device 401, fine bubbles are mixed during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, that is, during clutch engagement control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Supply of oil to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is prohibited, and oil that does not contain fine bubbles is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the switching oil passage 336. Can do.

  According to the lubricating device 401 according to the embodiment described above, fine bubbles are generated in the oil due to the rapid pressure reduction when the oil is discharged from the drain 33 of the sheave pressure control valve 30, and the fine bubbles are mixed. The oil is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements through the supply oil passage 34. Therefore, for example, lubrication using fine bubbles is appropriately performed with a simpler configuration. be able to.

  The lubrication device 401 includes a shift valve 437 that prohibits the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2. The lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be appropriately switched according to the state of the vehicle 2 by the valve 437.

  That is, in the lubricating device 401, the supply of oil into which the fine bubbles are mixed during the engagement operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Therefore, it is possible to suppress the friction characteristic (μ characteristic) of the friction engagement surface from fluctuating due to fine bubbles during the clutch fastening control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. As a result, the lubricating device 401 suppresses occurrence of so-called judder and slip in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 during the clutch fastening control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Can do.

  In addition, the lubrication apparatus 401 can realize a configuration in which, for example, an existing shift valve 437 is used to prohibit supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Therefore, the lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be switched at low cost. Further, the lubrication device 401 can prevent the oil mixed with fine bubbles during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 and has a range other than the drive range. Even in the selected case, oil mixed with fine bubbles can be supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, and drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be reduced. Can be reduced.

[Embodiment 5]
FIG. 6 is a schematic configuration diagram of the lubricating device according to the fifth embodiment, and FIG. 7 is a flowchart illustrating an example of switching control in the lubricating device according to the fifth embodiment. The lubricating device according to the fifth embodiment is different from the third and fourth embodiments in the configuration of the switching device.

  As shown in FIG. 6, the lubrication device 501 according to the present embodiment includes a drain 33, a supply oil passage 34, a check valve 235, a switching oil passage 336 as a switching supply passage, and a solenoid as a switching device. And a valve 537.

  The solenoid valve 537 is connected to the supply oil passage 34 and the switching oil passage 336, and one is connected to the lubrication hole of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 depending on the situation, and the other is connected to the drain. It is. The solenoid valve 537 inhibits supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2.

  The solenoid valve 537 switches the supply oil path 34 and the switching oil path 336 according to the engagement state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as the state of the vehicle 2. The solenoid valve 537 prohibits the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. The solenoid valve 537 of the present embodiment is a so-called electromagnetic valve, and is driven by a control signal from the ECU 7 as a control device. The ECU 7 outputs a control signal to the solenoid valve 537 according to the engagement state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 to switch the passage.

  When the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are completely engaged or completely released, the ECU 7 sets the solenoid valve 537 to a non-operating state (non-energized state). In this case, the solenoid valve 537 is set so as to connect the supply oil passage 34 to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. As a result, the lubrication device 501 uses the forward / reverse switching clutch 18 to switch the forward / reverse switching oil when the forward / reverse switching brake 19 is in the fully engaged state or in the fully released state. The brake 19 can be supplied. As a result, the lubricating device 501 can reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  On the other hand, when the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are engaged, typically, when the ECU 7 is in the half-engaged state, the ECU 7 puts the solenoid valve 537 into an operating state (energized state). In this case, the solenoid valve 537 switches the passage for supplying oil to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 from the supply oil passage 34 to the switching oil passage 336. As a result, the lubricating device 501 has fine bubbles mixed during engagement of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, that is, during clutch engagement control of the forward / reverse switching clutch 18 and forward / reverse switching brake 19. Supply of oil to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is prohibited, and oil that does not contain fine bubbles is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the switching oil passage 336. Can do.

  Next, an example of control in the lubrication apparatus 501 will be described with reference to the flowchart of FIG. Note that these control routines are repeatedly executed at a control cycle of several ms to several tens of ms.

  First, the ECU 7 measures various signals (ST1), and determines whether there are clutch engagement control signals for the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 based on the measurement results of the signals (ST2).

  When the ECU 7 determines that there is no clutch engagement control signal (ST2: No), that is, the clutch engagement control is not being performed, and the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are in the fully engaged state or in the fully released state. When it is determined that the solenoid valve 537 is in a non-operating state (non-energized state) (ST3), the supply oil passage 34 is connected to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 by the solenoid valve 537. The current control cycle is terminated, and the next control cycle is started.

  When the ECU 7 determines that there is a clutch engagement control signal (ST2: Yes), that is, when the clutch engagement control is being performed and it is determined that the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are in a semi-engaged state. The solenoid valve 537 is set in the operating state (energized state) (ST4), the switching oil passage 336 is connected to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 by the solenoid valve 537, and the current control cycle To end the next control cycle.

  According to the lubricating device 501 according to the embodiment described above, fine bubbles are generated in the oil due to the rapid pressure reduction when the oil is discharged from the drain 33 of the sheave pressure control valve 30, and the fine bubbles are mixed. The oil is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements through the supply oil passage 34. Therefore, for example, lubrication using fine bubbles is appropriately performed with a simpler configuration. be able to.

  The lubricating device 501 includes a solenoid valve 537 that prohibits the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2. The lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be appropriately switched according to the state of the vehicle 2 by the valve 537.

  That is, in the lubricating device 501, the oil that is mixed with fine bubbles during the engagement of the solenoid valve 537 with the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Therefore, it is possible to suppress the friction characteristic (μ characteristic) of the friction engagement surface from fluctuating due to fine bubbles during the clutch fastening control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. As a result, the lubrication device 501 suppresses so-called judder and slip in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 during the clutch fastening control of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Can do.

  In addition, the lubrication device 501 can prevent the oil mixed with fine bubbles during the engaging operation of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, and can also prevent a range other than the drive range ( For example, even when a parking range, a reverse range, a neutral range, etc.) are selected, oil mixed with fine bubbles can be supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, The drag torque generated in the clutch 18 and the forward / reverse switching brake 19 can be reduced. In addition, the lubricating device 501 can realize a configuration in which, for example, a new solenoid valve 537 is used to prohibit the supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Therefore, the degree of freedom of the installation location can be ensured.

[Embodiment 6]
FIG. 8 is a schematic configuration diagram of the lubricating device according to the sixth embodiment, FIG. 9 is a diagram showing an example of the relationship between the clutch rotational speed and the drag torque, and FIG. 10 is a switching in the lubricating device according to the sixth embodiment. It is a flowchart explaining an example of control. The lubrication apparatus according to the sixth embodiment is different from the fifth embodiment in terms of the control content of the switching control.

  As shown in FIG. 8, the lubricating device 601 according to the present embodiment includes a drain 33, a supply oil passage 34, a check valve 235, a switching oil passage 336, a solenoid valve 537, and a clutch rotational speed sensor 638. Is provided.

  The clutch rotational speed sensor 638 detects the clutch rotational speed as the rotational speed of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 and outputs the detection result to the ECU 7.

  The solenoid valve 537 according to the present embodiment includes a supply oil passage 34 and a switching oil passage 336 according to the rotation state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements. Switch. Solenoid valve 537 performs forward / reverse switching of oil mixed with fine bubbles when the clutch rotational speed (rotational speed) of forward / reverse switching clutch 18 and forward / reverse switching brake 19 is equal to or higher than a predetermined rotational speed (speed) set in advance. Supply to the clutch 18 and the forward / reverse switching brake 19 is prohibited. The ECU 7 outputs a control signal to the solenoid valve 537 according to the clutch rotational speed of the forward / reverse switching clutch 18 detected by the clutch rotational speed sensor 638 or the clutch rotational speed of the forward / reverse switching brake 19 to switch the passage.

  Here, in FIG. 9, the horizontal axis represents the clutch rotational speed, and the vertical axis represents the drag torque generated by the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. In the figure, the solid line L1 represents an example of the relationship between the clutch rotational speed and the drag torque when oil not mixed with fine bubbles is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. L2 represents an example of the relationship between the clutch rotational speed and the drag torque when oil mixed with fine bubbles is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  As is clear from FIG. 9, the drag torque generated by the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is more preferably supplied with oil mixed with fine bubbles in a state where the clutch rotational speed is relatively low. It tends to be relatively lower than when oil that does not contain fine bubbles is supplied. However, when the engine speed gradually increases and the clutch speed gradually increases with this, the apparent viscosity of the oil tends to increase due to fine bubbles mixed in the oil. For this reason, the drag torque generated by the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 should be supplied with oil in which fine bubbles are not mixed when the clutch rotational speed reaches a high rotational speed range equal to or higher than a predetermined rotational speed. It tends to be relatively lower than when oil containing fine bubbles is supplied.

  Here, the ECU 7 sets a predetermined number of rotations at which the magnitude relationship of the drag torque is reversed between when the oil not mixed with fine bubbles is supplied and when the oil mixed with fine bubbles is supplied. Is set in advance as the upper limit rotational speed N at which the drag torque reduction effect can be obtained. The ECU 7 acquires the clutch rotational speed Nc of the forward / reverse switching clutch 18 and the forward / backward switching brake 19 detected by the clutch rotational speed sensor 638, compares the clutch rotational speed Nc with the upper limit rotational speed N, and compares The drive of the solenoid valve 537 is controlled according to the result.

  When the ECU 7 determines that the clutch rotational speed Nc detected by the clutch rotational speed sensor 638 is lower than the upper limit rotational speed N, the ECU 7 puts the solenoid valve 537 into a non-operating state (non-energized state). As a result, when the clutch rotational speed Nc is lower than the upper limit rotational speed N, the lubricating device 601 can supply the oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the supply oil passage 34. it can. As a result, the lubricating device 601 can reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  On the other hand, when the ECU 7 determines that the clutch rotational speed Nc detected by the clutch rotational speed sensor 638 is equal to or higher than the upper limit rotational speed N, the ECU 7 sets the solenoid valve 537 in the operating state (energized state). Thereby, the lubricating device 601 is fine when the clutch rotational speed Nc is equal to or higher than the upper limit rotational speed N, that is, when the clutch rotational speed Nc is in a high rotational speed range where the drag torque reduction effect due to fine bubbles is weak. The oil mixed with bubbles is prohibited from being supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19, and the oil not mixed with fine bubbles through the switching oil passage 336 is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Can be supplied to. As a result, the lubricating device 601 can further reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 even in the high rotation range of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  Next, an example of control in the lubrication apparatus 601 will be described with reference to the flowchart of FIG. Note that these control routines are repeatedly executed at a control cycle of several ms to several tens of ms.

  First, the ECU 7 measures the clutch rotational speed Nc of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 based on the detection result of the clutch rotational speed sensor 638 (ST21), and the clutch rotational speed Nc is preset. It is determined whether it is lower than the upper limit rotational speed N (ST22).

  When the ECU 7 determines that the clutch rotational speed Nc is lower than the upper limit rotational speed N (Yes: ST22: Yes), the ECU 7 measures various signals (ST23), and based on the measurement result of this signal, the forward / reverse switching clutch 18, It is determined whether or not there is a clutch engagement control signal for the forward / reverse switching brake 19 (ST24).

  When the ECU 7 determines that there is no clutch engagement control signal (ST24: No), the solenoid valve 537 is set in a non-operating state (non-energized state) (ST25), and the supply oil path 34 is moved forward and backward in the solenoid valve 537. 18. The state is connected to the lubrication hole of the forward / reverse switching brake 19, the current control cycle is terminated, and the next control cycle is started.

  When the ECU 7 determines in ST22 that the clutch rotational speed Nc is equal to or higher than the upper limit rotational speed N (Yes: ST22: No), the ECU 7 determines in ST24 that there is a clutch engagement control signal (ST24: Yes). The solenoid valve 537 is in an operating state (energized state) (ST26), and the switching oil passage 336 is connected to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 by the solenoid valve 537, and the current control cycle To end the next control cycle.

  According to the lubricating device 601 according to the embodiment described above, fine bubbles are generated in the oil due to rapid pressure reduction when the oil is discharged from the drain 33 of the sheave pressure control valve 30, and the fine bubbles are mixed. The oil is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements through the supply oil passage 34. Therefore, for example, lubrication using fine bubbles is appropriately performed with a simpler configuration. be able to.

  The lubrication device 601 includes a solenoid valve 537 that prohibits supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2. The lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be appropriately switched according to the state of the vehicle 2 by the valve 537.

  That is, the lubricating device 601 is used when the solenoid valve 537 has a rotational speed (clutch rotational speed Nc) of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 equal to or higher than a predetermined speed (upper limit rotational speed N). Since the supply of the oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is prohibited, power loss can be reduced even in the high rotation range of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. For example, fuel consumption can be improved in a wider driving range.

[Embodiment 7]
FIG. 11 is a schematic configuration diagram of the lubricating device according to the seventh embodiment, and FIG. 12 is a diagram illustrating an example of a relationship between the clutch rotational speed and the drag torque. The lubricating device according to the seventh embodiment is different from the sixth embodiment in the configuration of the switching device.

  As shown in FIG. 11, the lubricating device 701 according to the present embodiment includes a drain 733 serving as a discharge port for generating fine bubbles in oil, a supply oil passage 34, a check valve 235, and a switching oil passage 336. A hydraulic switching valve 737 as a switching device is provided.

  Here, the hydraulic control device 706 in which the lubrication device 701 of this embodiment is incorporated includes the oil pan 25, the oil pump 26, the primary regulator valve 27, the secondary regulator valve 28, the line pressure control valve 29, the sheave pressure control valve 30, and the like. In addition, a line pressure control valve 739 as a control valve is further provided.

  The sheave pressure control valve 30 of the present embodiment serves as a primary pressure of oil supplied to the primary sheave hydraulic chamber 23 as a sheave pressure. The sheave pressure control valve 30 has a spool valve element and a plurality of ports. For example, a discharge port of an oil pump 26 is connected to an input port, and a primary sheave hydraulic chamber is connected to an output port via a control valve (not shown). 23 etc. are connected.

  The line pressure control valve 739 adjusts the third line pressure. For example, the line pressure control valve 739 adjusts the third line pressure to a predetermined pressure or higher. The third line pressure is the original pressure of oil introduced into a sheave control valve (not shown) for controlling the secondary pressure introduced into the secondary sheave hydraulic chamber 24. The line pressure control valve 739 has a spool valve element and a plurality of ports. For example, the discharge port of the oil pump 26 is connected to the input port, and the secondary sheave hydraulic chamber is connected to the output port via a sheave control valve (not shown). 24 etc. are connected.

  The drain 733 of the lubricating device 1 according to this embodiment is provided in the line pressure control valve 739. The drain 733 generates fine bubbles in the oil by reducing the pressure when the oil is discharged from the line pressure control valve 739. The supply oil passage 34 of the lubrication device 701 connects a drain (drain port) 733 of the line pressure control valve 739 to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 of the power transmission device 5. The supply oil passage 34 supplies oil mixed with fine bubbles generated when discharged from the drain 733 to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements.

  The hydraulic switching valve 737 of the present embodiment is configured so that the supply oil path 34 and the switching oil path 336 correspond to the rotation state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements as the state of the vehicle 2. And switch. The hydraulic pressure changeover valve 737 moves forward and backward of oil mixed with fine bubbles when the clutch rotational speed (rotational speed) of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is equal to or higher than a predetermined rotational speed (speed) set in advance. Supply to the switching clutch 18 and the forward / reverse switching brake 19 is prohibited.

  Here, the hydraulic pressure switching valve 737 includes a primary pressure (pressure in the primary sheave hydraulic chamber 23) and a secondary pressure (secondary sheave hydraulic pressure) of the transmission 11 as a belt-type continuously variable transmission that performs a shifting operation according to the oil pressure. It operates according to the pressure difference from the pressure in the chamber 24). The hydraulic pressure switching valve 737 switches the passage according to the pressure difference between the primary pressure and the secondary pressure. The hydraulic pressure switching valve 737 is introduced with a primary pressure and a secondary pressure, and switches the passage according to the magnitude relationship between the primary pressure and the secondary pressure.

  Here, as illustrated in FIG. 12, the power transmission device 5 of the present embodiment has a peak of drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 within the clutch rotation speed range T used during high-speed cruise. The performances of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 are set so as to be positioned at the position.

  The hydraulic pressure switching valve 737 typically has a primary pressure Ppri> secondary pressure Psec when the magnitude relationship between the primary pressure and the secondary pressure is such that the speed change ratio of the transmission 11 is an acceleration side of 1 or less. In such a relationship, the spring biasing force and the like are set so that the supply oil passage 34 is connected to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. As a result, the lubrication device 701 is on the speed increasing side where the transmission ratio of the transmission 11 is 1 or less. For example, when the clutch rotational speed Nc is lower than a predetermined rotational speed during high-speed cruise, the supply oil passage 34 is provided. Through this, oil mixed with fine bubbles can be supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. As a result, the lubricating device 701 can reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  On the other hand, in the hydraulic pressure switching valve 737, when the magnitude relationship between the primary pressure and the secondary pressure is on the deceleration side where the transmission ratio of the transmission 11 is larger than 1, typically, the primary pressure Ppri <secondary pressure Psec. When there is a relationship, the switching oil passage 336 is connected to the lubrication holes of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. As a result, the lubricating device 701 is on the deceleration side where the transmission ratio of the transmission 11 is greater than 1, and when the clutch rotational speed Nc is greater than or equal to a predetermined rotational speed set in advance, for example, before and after oil mixed with fine bubbles. The supply to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 is prohibited, and oil in which fine bubbles are not mixed can be supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 through the switching oil passage 336. As a result, the lubricating device 701 can further reduce drag torque generated in the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 even in the high rotation range of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19.

  According to the lubricating device 701 according to the embodiment described above, fine bubbles are generated in the oil due to rapid pressure reduction when the oil is discharged from the drain 733 of the line pressure control valve 739, and the fine bubbles are mixed. The oil is supplied to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 as friction engagement elements through the supply oil passage 34. Therefore, for example, lubrication using fine bubbles is appropriately performed with a simpler configuration. be able to.

  The lubrication device 701 includes a hydraulic switching valve 737 that prohibits supply of oil mixed with fine bubbles to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 according to the state of the vehicle 2. The lubrication state of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 can be appropriately switched according to the state of the vehicle 2 by the hydraulic pressure switching valve 737.

  That is, the lubrication device 701 operates according to the pressure difference between the primary pressure and the secondary pressure of the transmission 11 in which the hydraulic pressure switching valve 737 performs a speed change operation according to the oil pressure. When the rotation speed (clutch rotation speed Nc) of the switching brake 19 is equal to or higher than a predetermined speed (upper rotation speed N) set in advance, oil mixed with fine bubbles is transferred to the forward / reverse switching clutch 18 and the forward / reverse switching brake 19. Since the supply is prohibited, the power loss can be reduced even in the high rotation range of the forward / reverse switching clutch 18 and the forward / reverse switching brake 19 while suppressing the increase in size at a low cost. Can be improved.

  The lubrication apparatus according to the above-described embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims. The lubricating device according to the present embodiment may be configured by combining a plurality of the embodiments described above.

  The travel drive source described above is not limited to the engine. The transmission described above includes, for example, a manual transmission (MT), a stepped automatic transmission (AT), a toroidal continuously variable automatic transmission (CVT), a multimode manual transmission (MMT), a sequential manual transmission ( SMT), dual clutch transmission (DCT), or the like may be used. In the above description, the liquid medium has been described as being oil (lubricating oil), but is not limited thereto.

1, 201, 301, 401, 501, 601, 701 Lubricating device 2 Vehicle 3 Engine (driving drive source)
4 Drive Wheel 5 Power Transmission Device 6, 706 Hydraulic Control Device 7 ECU
10 Forward / reverse switching mechanism 11 Transmission (belt type continuously variable transmission)
17 planetary gear mechanism 18 forward / reverse switching clutch (friction engagement element)
19 Forward / reverse switching brake (friction engagement element)
20 Primary pulley 21 Secondary pulley 22 Belt 23 Primary sheave hydraulic chamber 24 Secondary sheave hydraulic chamber 30 Sheave pressure control valve (control valve)
31, 32 Clutch hydraulic chamber 33 Drain (discharge port)
34 Supply oil passage (fine bubble mixed medium supply passage)
235 Check valve (discharge device)
336 Switching oil passage (switching supply passage)
337 Manual valve (switching device)
437 Shift valve (switching device)
537 Solenoid valve (switching device)
733 Drain (Discharge port)
737 Hydraulic switching valve (switching device)
739 Line pressure control valve (control valve)

Claims (7)

Provided in a control valve for controlling a liquid medium to be supplied to a power transmission device that transmits power from a driving source for driving the vehicle to driving wheels, into the liquid medium by decompression when the liquid medium is discharged from the control valve. A discharge port for generating fine bubbles;
A fine bubble mixed medium supply passage that connects the discharge port and the friction engagement element of the power transmission device,
Lubrication device. The liquid medium provided in the fine bubble-containing medium supply passage, and when the pressure in the fine bubble-containing medium supply passage is equal to or higher than a predetermined pressure set in advance, the liquid medium from the inside of the fine bubble-containing medium supply passage to the outside Equipped with a discharge device for discharging
The lubricating device according to claim 1. A switching device for prohibiting the supply of the liquid medium mixed with the fine bubbles to the friction engagement element according to the state of the vehicle;
The lubricating device according to claim 1 or 2. The switching device prohibits the supply of the liquid medium mixed with the fine bubbles to the friction engagement element during the engagement operation of the friction engagement element;
The lubricating device according to claim 3. The switching device prohibits the supply of the liquid medium mixed with the fine bubbles to the friction engagement element when the rotational speed of the friction engagement element is equal to or higher than a predetermined speed set in advance.
The lubricating device according to claim 3 or 4. The switching device operates according to a pressure difference between a primary pressure and a secondary pressure of a belt-type continuously variable transmission that performs a speed change operation according to the pressure of the liquid medium.
The lubricating device according to claim 5. A switching supply passage capable of supplying the liquid medium to the friction engagement element without going through the discharge port;
When the switching device prohibits the supply of the liquid medium mixed with the fine bubbles to the friction engagement element, the switching device supplies a passage for supplying the liquid medium to the friction engagement element. Switching from the passage to the switching supply passage,
The lubricating device according to any one of claims 3 to 6.

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