JP6534894B2 - transmission - Google Patents

Description

  The present invention relates to a transmission that sucks in oil from a suction port disposed in an oil pan by the operation of an oil pump.

  A transmission such as a stepped automatic transmission (AT) or a continuously variable transmission (CVT) includes an oil pump that discharges oil (ATF), and adjusts the pressure of high-pressure oil discharged from the oil pump to Supplying functions realize various functions such as shifting and forward / reverse switching. Usually, an oil strainer is provided upstream of the oil pump to remove foreign matter in the oil. The oil strainer is, for example, directly attached to the bottom of the oil pan.

  When the oil pump sucks in air together with the oil, air biting occurs in the oil pump, which may cause abnormal noise and a drop in hydraulic pressure. Therefore, various techniques for suppressing air intake have been proposed. For example, in Patent Document 1, by forming a horizontal passage in addition to a plurality of vertical oil dropping passages, the flow rate of oil is reduced by temporarily flowing the oil into the horizontal passage, and the flow rate is reduced. It is described that the generation of bubbles in oil is suppressed by dropping the oil into an oil pan. Further, in Patent Document 2, by providing a protrusion so as to surround the suction port of the oil strainer, the flow of oil is resisted at this protrusion to reduce the flow velocity, thereby separating air bubbles from the oil. Is described.

Japanese Utility Model Application Publication No. 5-47312 JP, 2008-309291, A

  The closer the suction port of the oil strainer is to the oil surface of the oil accumulated in the oil pan, the easier it is to suck air from the suction port. In order to prevent suction of air from the suction port, it is necessary to lower the height of the suction port and keep the suction port away from the oil surface. However, due to the restriction of the space in the downward direction of the oil pan, the area of the suction port may be reduced by lowering the height of the suction port. As the area of the suction port decreases, the flow velocity of oil flowing into the suction port increases. Further, the closer to the wall forming the suction port, the greater the resistance to oil, so the oil becomes harder to flow. Therefore, the flow velocity distribution of the oil is higher at the central portion of the suction port and lower as it is away from the central portion.

  With such flow velocity distribution, the shape of the oil surface of the oil in the oil pan becomes, for example, a substantially V-shaped oil surface shape OF as shown in FIG. FIG. 7 is a view of the oil pan 100 as viewed from below, and shows the oil surface shape OF when the oil is sucked in at the suction port 102 of the strainer 101 attached directly to the bottom surface of the oil pan 100. The flow velocity of the substantially V-shaped oil surface shape OF increases as the area of the suction port decreases, and the oil surface decreases at the central portion. When the oil level decreases, it becomes easy to suck in air from the suction port (especially when the oil temperature is high and the oil viscosity is high). Therefore, in the structure where the area of the suction port is small, the amount of oil can not be reduced (that is, the height of the oil level can not be reduced). As the amount of oil increases, the weight and cost increase, and the resistance to agitation when the rotating member of the transmission scraps the oil increases. The patent documents 1 and 2 mentioned above do not describe at all about the technique for controlling the suction of the air at the time of making the area of the suction opening of oil small.

  The present invention has been made to solve the above-mentioned problems, and even when the area of the oil suction port is reduced, the substantially V-shaped oil surface shape can be relaxed, and air can be sucked from the suction port. An object of the present invention is to provide a transmission that can be suppressed.

  The transmission according to the present invention is a transmission that sucks in oil from a suction port disposed in an oil pan by the operation of an oil pump, and has a collection port disposed in the case of the transmission, and is disposed in the case. An oil collecting unit that collects scattered oil, and an outlet disposed in the oil pan, which guides the oil collected by the oil collecting unit to the oil pan and discharges the oil in the oil pan And a guide portion, wherein the discharge port faces the suction port and is disposed along the inner circumferential portion of the suction port.

  According to the transmission according to the present invention, the oil collecting portion collects the oil scattered in the case, and the collected oil is poured from the discharge port of the oil guiding portion into the suction port disposed in the oil pan. At this time, the pressure due to the head difference between the oil surface of the oil in the oil collecting portion and the oil guiding portion and the oil surface of the oil in the oil pan makes the flow velocity of the oil discharged from the discharge port of the oil guiding portion high. In particular, in the transmission according to the present invention, since the discharge port of the oil guiding portion is disposed along the inner peripheral portion around the central portion of the suction port, the flow velocity of oil flowing into the inner peripheral portion of the suction port is high. As a result, the flow rate of oil flowing into the central portion of the suction port decreases. Thus, even when the area of the oil suction port is reduced, the substantially V-shaped oil surface shape is alleviated. For this reason, the fall of the oil level in the central part is controlled, and it is possible to suppress the suction of air from the suction port (the air suction resistance can be improved). Thus, in the transmission according to the present invention, the amount of oil can be reduced, so the oil level of the oil in the oil pan can be lowered, the stirring resistance can be reduced, and the fuel consumption can be improved. In addition, reducing the amount of oil can reduce the weight and cost. Further, air biting by the oil pump can be suppressed, and generation of abnormal noise due to air biting and a drop in oil pressure can be suppressed.

  In the transmission according to the present invention, the suction port and the discharge port are closer to the oil surface of oil assumed when acceleration in any direction is acting on the vehicle and / or the vehicle is inclined with respect to the horizontal surface It is preferable that the inner side be placed.

  In this way, even when the acceleration is applied to the vehicle in any direction due to deceleration of the vehicle or when the oil is biased in the oil pan when the vehicle is inclined on a slope or the like, the suction port and Since the discharge port does not come out of the oil, it is possible to suppress suction of air from the suction port.

  In the transmission according to the present invention, the suction port is preferably inclined relative to the vertical direction, and the discharge port is preferably inclined so as to be substantially parallel to the inclined suction port.

  In this way, even if the oil is uneven in the oil pan due to deceleration of the vehicle and the oil level is inclined, the suction port and the discharge port are inclined along the inclined oil level, The inlet and outlet can be kept away from the sloping oil level. This can further suppress suction of air from the suction port.

  In the transmission according to the present invention, the cross-sectional area of the oil flow passage of the oil guide portion is preferably smaller than the cross-sectional area of the oil flow passage of the oil collection portion.

  In this way, it is possible to generate a difference in height between the oil surface of the oil in the oil collecting portion and the oil guiding portion and the oil surface of the oil in the oil pan, and pressure due to the head difference can be easily generated. . In addition, by adjusting the difference between the cross-sectional area of the oil flow path of the oil guide portion and the cross-sectional area of the oil flow path of the oil collection portion, the magnitude of the pressure due to the head difference The flow rate can be easily adjusted.

  In the transmission according to the present invention, the oil collecting portion is preferably provided along the inner wall surface of the case.

  According to this configuration, the oil that flows down along the inner wall surface of the case can be collected by the oil collecting unit, so that the oil can be efficiently collected by the oil collecting unit.

  The transmission according to the present invention is provided with an oil strainer which is provided in the oil pan and captures foreign matter of the oil sucked by the operation of the oil pump, and the above-mentioned suction port is the suction port of the oil strainer.

  In the case of this configuration, even when the area of the suction port of the oil strainer provided in the oil pan is reduced, it is possible to prevent the oil strainer (and hence the oil pump) from sucking in air. Further, the oil strainer can prevent the oil pump from sucking in foreign matter.

  In the transmission according to the present invention, the oil strainer is directly attached to the bottom surface of the oil pan, the suction port of the oil strainer is disposed along the bottom surface of the oil pan, and the discharge ports are both sides and upper portions in the inner peripheral portion of the suction port It may be arranged along the

  In the case of this configuration, the discharge port of the oil guiding portion is disposed along the both sides and the upper portion of the inner periphery of the suction port of the oil strainer, so the flow velocity of oil flowing into both sides and the upper portion of the suction port is high. As a result, the flow rate of oil flowing into the central portion of the suction port decreases. Accordingly, even when the area of the suction port of the oil strainer is reduced, the substantially V-shaped oil surface shape can be relaxed.

  According to the present invention, even when the area of the oil suction port is reduced, the substantially V-shaped oil surface shape can be relaxed, and suction of air from the suction port can be suppressed.

It is a front view which shows typically the inside of the continuously variable transmission which concerns on embodiment. It is a side view showing typically the inside of the continuously variable transmission concerning an embodiment. It is a perspective view showing an oil strainer concerning an embodiment. It is a side sectional view showing typically the circumference of the suction opening of an oil strainer concerning an embodiment, and the discharge opening of an oil duct. It is a figure which shows typically arrangement | positioning of the discharge port of the oil duct which concerns on embodiment. It is a figure which shows the flow velocity distribution of oil typically. It is a figure which shows typically the oil surface shape when oil is sucked from the suction port of the oil strainer of the conventional transmission.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Further, in the respective drawings, the same elements are denoted by the same reference numerals, and duplicate explanations will be omitted.

  In the embodiment, the invention is applied to a continuously variable transmission (CVT) as a transmission mounted on a vehicle. The continuously variable transmission 1 according to the embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a front view schematically showing the inside of the continuously variable transmission 1 according to the embodiment. FIG. 2 is a side view schematically showing the inside of the continuously variable transmission 1 according to the embodiment. FIG. 3 is a perspective view showing the oil strainer 14 of the continuously variable transmission 1 according to the embodiment. FIG. 4 is a side sectional view schematically showing the periphery of the suction port 14 d of the oil strainer 14 and the discharge port 24 of the oil ducts 22 and 23 according to the embodiment. FIG. 1 is a front view seen from the front side of the vehicle, and indicates the left side of the vehicle by an arrow indicated by a symbol L, and indicates the right side of the vehicle by an arrow indicated by a symbol R. FIG. 2 is a side view as viewed from the left side of the vehicle, and indicates the front of the vehicle by an arrow indicated by symbol F, and indicates the rear of the vehicle by an arrow indicated by symbol B.

  The continuously variable transmission 1 is a transmission that automatically changes the transmission ratio steplessly according to the driving state of the vehicle. The continuously variable transmission 1 includes a case 2 and an oil pan 3 disposed below the case 2. A sealed space is formed by the case 2 and the oil pan 3 to accommodate the members of the continuously variable transmission 1 such as the pulleys 10 and 11 and the chain 12 described later. A predetermined amount of oil (ATF) is accumulated in the oil pan 3.

  FIGS. 1, 2 and 4 show the oil level OL1 of the oil accumulated in the oil pan 3, and the oil level OL1 is a horizontal surface. The oil surface OL1 is an oil surface when acceleration in any direction is not acting on the vehicle and the vehicle is not inclined to the horizontal surface. Further, FIG. 4 also shows the oil level OL2, and the oil level OL2 is an inclined surface which is inclined at a predetermined angle with respect to the horizontal plane. The oil level OL2 is an oil level when the vehicle decelerates and the decelerating acceleration acts on the vehicle.

  The continuously variable transmission 1 is, for example, a chain type continuously variable transmission in which a chain 12 is wound between a primary pulley 10 and a secondary pulley 11. The primary pulley 10 has a fixed pulley 10a and a movable pulley 10b, and is configured such that the cone surface distance between the fixed pulley 10a and the movable pulley 10b, that is, the pulley groove width can be changed. The secondary pulley 11 has a fixed pulley 11a and a movable pulley 11b, and is configured to be able to change the pulley groove width of the fixed pulley 11a and the movable pulley 11b. In the continuously variable transmission 1, by changing the pulley groove width of each pulley 10, 11 and changing the ratio (pulley ratio) of the winding diameter of the chain 12 to each pulley 10, 11, the gear ratio is stepless. change.

  In the continuously variable transmission 1, the lower part of the secondary pulley 11 is immersed in the oil accumulated in the oil pan 3. Therefore, when the secondary pulley 11 rotates, the oil of the oil pan 3 is scraped up. The scraped oil becomes lubricating oil for each member such as the pulleys 10 and 11 and the chain 12 and scatters in the case 2.

  A primary hydraulic chamber (not shown) is formed in the primary pulley 10 (movable pulley 10b). On the other hand, a secondary hydraulic pressure chamber (not shown) is formed in the secondary pulley 11 (movable pulley 11b). The pulley groove width of each of the primary pulley 10 and the secondary pulley 11 is set by adjusting the primary hydraulic pressure introduced into the primary hydraulic chamber of the primary pulley 10 and the secondary hydraulic pressure introduced into the secondary hydraulic chamber of the secondary pulley 11 Be changed.

  The primary hydraulic pressure and the secondary hydraulic pressure (hydraulic pressure for shifting the continuously variable transmission 1) are controlled by, for example, a valve body (not shown) in which a control valve (C / V) mechanism is incorporated. The control valve mechanism is configured to open and close an oil passage formed in the control valve mechanism using a plurality of spool valves and a solenoid valve (electromagnetic valve) for moving the spool valves, whereby the hydraulic pressure discharged from the oil pump 13 (line The pressure is adjusted and supplied to the primary hydraulic chamber of the primary pulley 10 and the secondary hydraulic chamber of the secondary pulley 11. Also, the control valve mechanism supplies, for example, the adjusted hydraulic pressure (hydraulic pressure for operation, hydraulic pressure for lubrication, etc.) to a forward / backward switching mechanism etc. for switching between forward and reverse of the vehicle. The oil supplied for lubrication is, for example, discharged from the axial center portion of the pulleys 10 and 11 and scattered in the case 2.

  The oil pump 13 sucks in the oil accumulated in the oil pan 3, pressurizes it, and discharges high pressure oil to the valve body (control valve mechanism). The oil pump 13 is attached to the side of the case 2 or the like. Oil is supplied to the oil pump 13 via an oil strainer 14.

  The oil strainer 14 is disposed on the upstream side of the oil pump 13 and captures foreign substances (contamination) in the oil sucked into the oil pump 13. The oil strainer 14 is directly attached to the bottom surface 3 a of the oil pan 3 so as to be immersed in the oil accumulated in the oil pan 3.

  The oil strainer 14 has a screen 14b disposed in a housing 14a. The screen 14 b is in the form of mesh, and is a filter medium that captures foreign matter in oil. An oil discharge port 14 c is provided on one end side (the front side in the present embodiment) of the upper surface of the oil strainer 14. An oil suction port 14 d is provided on the other end side (rear side in the present embodiment) of the oil strainer 14. The suction port 14 d is formed along the bottom surface 3 a of the oil pan 3.

  The suction port 14d is always disposed at a position where it does not go out of the oil of the oil pan 3 regardless of the condition of the vehicle. That is, when acceleration in any direction acts on the vehicle due to acceleration / deceleration or turning of the vehicle, or when the vehicle is inclined to the horizontal surface on a slope or the like, the oil is biased in the oil pan 3 and the oil surface is inclined. For example, FIG. 4 shows an inclined oil level OL2 when the vehicle decelerates. At this time, there may be a place where no oil exists in the oil pan 3. Even in such a case, the suction port 14d is disposed at a predetermined location (for example, the central portion of the oil pan 3) in the oil pan 3 so that the entire surface of the suction port 14d enters the oil, and the width of the suction port 14d and The height is decided.

  Further, when the oil surface of the oil in the oil pan 3 is inclined, the suction port 14d is inclined at a predetermined angle with respect to the vertical direction so as to be away from the inclined oil surface. That is, as described above, when acceleration in any direction acts on the vehicle or the vehicle is inclined with respect to the horizontal plane, the oil surface of the oil is inclined in the oil pan 3. When the suction port 14d is inclined so as to be substantially parallel to the inclined oil surface, the suction port 14d can be kept away from the oil surface. In the present embodiment, the suction port 14d is inclined at a predetermined angle from the rear side to the front side (see FIG. 4), and both left and right sides are each inclined at a predetermined angle to the center side (see FIG. 1). Accordingly, the shape of the suction port 14 is trapezoidal also when viewed from the front-rear direction, and trapezoidal also when viewed from the vertical direction.

  The position, width, height, and inclination angles at which the suction port 14d described above is arranged are, for example, assumed to be when the maximum acceleration in the front, rear, left, and right directions acts on the vehicle or when the vehicle travels on the slope of the maximum gradient. The position and inclination angle of the oil surface in the oil pan 3 in each of the assumed cases are respectively determined, and are determined from the position and inclination angle of the oil surface.

  In order to keep the suction port 14d away from the oil surface of the oil in the oil pan 3 so as not to suck air, it is desirable to lower the height of the suction port 14d. However, due to the space restriction in the downward direction of the oil pan 3 in the engine room, when the height of the suction port 14d is lowered, the area of the suction port 14d is reduced. Even when the area of the suction port 14d is small, in order to prevent suction of air from the suction port 14d, the oil surface shape of the oil does not have a substantially V-shaped oil surface shape OF as shown in FIG. There is a need to. Although the flow velocity of the oil increases as the area of the suction port 14d decreases as the substantially V-shaped oil surface shape OF is formed, the resistance to the oil increases as the wall side forming the suction port 14d increases. Because it is difficult for oil to flow. That is, the flow velocity of the oil sucked into the suction port 14d is higher at the central portion of the suction port 14d and lower as it is away from the central portion. In this case, the flow velocity distribution V2 is as shown by a two-dot chain line in FIG.

  Therefore, in the continuously variable transmission 1, the flow velocity of the portion (inner peripheral portion) around the central portion of the suction port 14d is increased in order to alleviate the substantially V-shaped oil surface shape and prevent the air from being absorbed. Thus, the flow velocity at the central portion of the suction port 14d is reduced. Therefore, the continuously variable transmission 1 is equivalent to the oil catch plates 20 and 21 (corresponding to the oil collecting portion described in the claims) and the oil ducts 22 and 23 (the oil guiding portion described in the claims). ) And.

  The oil catch plates 20 and 21 are members for collecting the oil scattered in the case 2. The oil catch plates 20, 21 have collecting ports 20a, 21a opened upward. It is desirable that the collection port 20a, 21a have an opening area as large as possible without contacting various members provided in the case 2 in order to collect a large amount of oil. Further, it is desirable that the collection ports 20a and 21a be disposed at a height position at which the oil falling on the inner wall surface of the case 2 can be efficiently collected. The oil catch plate 20 is formed along the right inner wall surface of the case 2 so as to cover the inner wall surface. The oil catch plate 21 is formed along the left inner wall surface of the case 2 so as to cover the inner wall surface. The oil catch plates 20 and 21 extend in the front-rear direction of the vehicle in order to increase the opening area of the collection ports 20a and 21a. The lower ends of the oil catch plates 20 and 21 are open, and the lower ends are in communication with the oil ducts 22 and 23.

  The oil ducts 22 and 23 are members for guiding the oil collected by the oil catch plates 20 and 21 to the oil pan 3 and discharging the oil into the oil pan 3. The oil ducts 22 and 23 have exhaust ports 24 (24 a, 24 b and 24 c) in the oil pan 3 opened toward the suction port 14 d of the oil strainer 14. The outlet 24 will be described in detail later. The oil duct 22 is provided along the right inner wall surface of the case 2 so as to cover the inner wall surface. The oil duct 23 is provided along the left inner wall surface of the case 2 so as to cover the inner wall surface. The upper ends of the oil ducts 22 and 23 are open, and the upper ends thereof communicate with the lower ends of the oil catch plates 20 and 21. The oil ducts 22 and 23 extend vertically from the oil catch plates 20 and 21 to the oil pan 3. At the lower end portions of the oil ducts 22 and 23, in order to provide the discharge port 24, pipelines 22a and 23a extending in the left-right direction in the oil pan 3 are respectively formed. The conduit 22 a of the oil duct 22 and the conduit 23 a of the oil duct 23 communicate with each other by the conduit 25.

  The outlet 24 will be described also with reference to FIG. FIG. 5 is a view schematically showing the arrangement of the discharge ports 24 of the oil ducts 2 and 23 according to the embodiment. FIG. 5 is a view from the front side of the vehicle, and also shows the suction port 14d. The discharge port 24 is disposed outside the suction port 14 d of the oil strainer 14 (at the rear side of the vehicle) at a predetermined interval. The discharge port 24 is disposed to face the suction port 14 d so as to discharge the oil toward the suction port 14 d. The discharge port 24 is always disposed at a position where it does not go out of the oil of the oil pan 3 (below the oil surface), regardless of the condition of the vehicle, similarly to the suction port 14d. The reason for arranging the discharge port 24 below the oil surface in this way is that, when a part of the discharge port 24 is out of the oil surface, the oil discharged from the air part of the discharge port 24 strikes the oil surface By denting the oil surface, the air suction resistance is reduced. Moreover, the discharge port 24 is inclined so as to be substantially parallel to each inclination of the suction port 14d. The discharge port 24 is disposed along the upper portion, the right side portion, and the left side portion in the inner peripheral portion (portion surrounding the central portion of the suction port 14d) of the suction port 14d, the upper discharge port 24a, the right side portion discharge port 24b, It comprises the left side outlet 24c.

  The upper discharge port 24a is an opening having a predetermined width opened downward from the same height position as the upper end 14e of the suction port 14a, and extends in the left-right direction of the vehicle. The upper exhaust port 24 a is formed by opening a part of a conduit 25 communicating the conduit 22 a of the oil duct 22 and the conduit 23 a of the oil duct 23. The right side discharge port 24b is an opening that is opened to the left from the same position in the left-right direction as the right end 14f of the suction port 14a, and extends in the vertical direction. The right side discharge port 24 b is formed by opening a part of the pipeline 22 a of the oil duct 22 on the right side. The left side discharge port 24c is an opening that is opened to the right from the same position in the left-right direction as the left end 14g of the suction port 14a, and extends in the vertical direction. The left side discharge port 24 c is formed by opening a part of the pipeline 23 a of the oil duct 23 on the left side. Each side discharge port 24b, 24c is inclined along the inclination of each side end 14f, 14g of the suction port 14a. Thus, the discharge port 24 (24a, 24b, 24c) is a substantially U-shaped opening along the inner peripheral portion (upper, right side, left side) of the suction port 14d of the suction port 14a.

  In the continuously variable transmission 1, the oil catch plates 20 and 21 and the oil ducts 22 and 23 increase the flow velocity of the oil discharged from the discharge port 24 (the flow velocity of the oil flowing into the inner peripheral portion of the suction port 14 d). The height of the oil surface OL3 of the above-mentioned oil is set to be higher than the height of the oil surface OL1 of the oil in the oil pan 3. That is, the flow velocity of the oil discharged from the discharge port 24 is increased by the pressure due to the head difference between the oil level OL3 and the oil level OL1. Therefore, the oil ducts 22 and 23 and the oil catch plates 20 and 21 are formed such that the cross sectional area of the oil flow paths of the oil ducts 22 and 23 is smaller than the cross sectional area of the oil flow channels of the oil catch plates 20 and 21 It is done. The head difference can be adjusted by adjusting the difference between the cross sectional area of the oil flow path of the oil ducts 22 and 23 and the cross sectional area of the oil flow path of the oil catch plates 20 and 21, and the oil discharged from the discharge port 24 Flow rate can be adjusted.

  With reference also to FIG. 6, the operation of the oil catch plates 20 and 21 and the oil ducts 22 and 23 in the continuously variable transmission 1 will be described. FIG. 6 is a view schematically showing the flow velocity distribution of oil. FIG. 6 is a view from below. The flow velocity distribution V1 of the oil indicated by an alternate long and short dash line indicates the flow velocity distribution in the case of the continuously variable transmission 1 according to the present embodiment. An oil flow velocity distribution V2 indicated by a two-dot chain line shows a flow velocity distribution in the case of a conventional continuously variable transmission (a continuously variable transmission without the oil catch plates 20 and 21 and the oil ducts 22 and 23). The flow velocity distribution V3 of the oil indicated by the broken line shows the flow velocity distribution of the oil when the oil is not discharged along the inner peripheral portion of the suction port 14d from the discharge port 24 of the oil ducts 22 and 23.

  The oil catch plates 20 and 21 collect the oil scattered in the case 2 at the collection ports 20a and 21a, respectively. At this time, the oil splashed in the case 2 hits the inner wall surface of the case 2 and often falls along the inner wall surface, so the oil catch plates 20 and 21 having large collection ports 20a and 21a along the inner wall surface Can efficiently collect the oil. The oil ducts 22 and 23 lead the collected oil to the oil pan 3 respectively. Then, the oil ducts 22 and 23 discharge the introduced oil from the discharge port 24 into the oil pan 3. At this time, since the oil level OL3 of the oil in the oil catch plates 20 and 21 and the oil ducts 22 and 23 is higher than the oil level OL1 of oil in the oil pan 3 (or the oil level OL2 inclined by deceleration), The flow velocity of the oil discharged from the discharge port 24 is high according to the pressure due to the head difference.

  The discharge ports 24 (24a, 24b, 24c) are disposed along the inner peripheral portion (upper and both side portions) of the suction port 14d. Therefore, in the inner peripheral portion of the suction port 14d, the oil having a high flow velocity discharged from the discharge port 24 is pushed in despite the resistance on the wall side, so the oil flow velocity is higher than that of the conventional continuously variable transmission. Get higher. On the other hand, at the central portion of the suction port 14d, the flow velocity at the inner peripheral portion around the central portion is high, so the flow velocity of oil is lower than that of the conventional non-step dressing machine. As a result, the flow velocity distribution of the oil becomes, for example, the flow velocity distribution V1 as shown in FIG. The flow velocity distribution V1 is lower than the flow velocity distribution V2 of the conventional continuously variable transmission, and the flow velocity at the inner peripheral portion around the central portion is higher and uniform. In the flow velocity distribution V1 shown in FIG. 6, the flow velocity at the central portion is lower than the flow velocity at the inner peripheral portion around it, but by adjusting the flow velocity of the oil discharged from the outlet 24, It is also possible to make the flow velocity and the flow velocity in the inner peripheral portion around the flow velocity approximately the same.

  Even when the area of the suction port 14d of the oil strainer 14 is reduced, the flow velocity distribution at the suction port 14d becomes the flow velocity distribution V1 more uniform than before, so the oil level of the oil is approximately V as shown in FIG. In the figure, the oil surface shape OF is relaxed. Therefore, the oil level decreases at the central portion of the suction port 14d, and it becomes difficult to suction air from the suction port 14d. In particular, even when the oil temperature is high and the viscosity of the oil is high, it is difficult to suck air from the suction port 14d.

  In particular, when acceleration acts on the vehicle due to deceleration or the like and the vehicle is inclined to the horizontal surface on a slope or the like, the oil in the oil pan 3 is biased. In this case, the oil surface of the oil is inclined from the horizontal surface (for example, inclined as oil surface OL2 shown in FIG. 4) and approaches the suction port 14d and the discharge port 24. Even in such a case, the flow velocity distribution of the oil sucked into the suction port 14d is made more uniform than before and the suction port 14d and the discharge port 24 are inclined, so it is difficult to suction air at the suction port 14d.

  In addition, the example of the flow velocity distribution of oil in case the discharge port 24 of the oil ducts 22 and 23 is not arrange | positioned so that the inner peripheral part of the suction port 14d may be followed is shown. For example, when the discharge port 24 is disposed inside the suction port 14d (inside the oil strainer 14), the flow rate of oil sucked from the suction port 14d decreases, so the flow velocity at the central portion of the suction port 14d is The flow velocity distribution V3 is lower than the flow velocity distribution V2 in the continuously variable transmission, but is higher than the flow velocity distribution V1 in the continuously variable transmission 1 according to the present embodiment. In this case, the substantially V-shaped oil surface shape OF is relieved compared to the conventional continuously variable transmission, but the substantially V-shaped oil surface shape OF is alleviated compared to the continuously variable transmission 1 according to the present embodiment. Degree of Further, when the discharge port 24 is disposed to face the entire surface of the suction port 14d, the flow rate of the oil sucked from the suction port 14d does not decrease, so the flow velocity distribution is the same as that of the conventional continuously variable transmission. It becomes. In this case, the substantially V-shaped oil surface shape OF is not relaxed.

  According to the continuously variable transmission 1 according to the present embodiment, the oil catch plates 20 and 21 and the oil ducts 22 and 23 are provided, and the discharge port 24 of the oil ducts 22 and 23 is opposed along the inner circumferential portion of the suction port 14d. By arranging them, even when the area of the suction port 14d is reduced, the flow velocity distribution of the oil flowing into the suction port 14d can be made uniform, and the substantially V-shaped oil surface shape can be relaxed. As a result, the decrease in oil level at the central portion can be suppressed, and suction of air from the suction port 14d can be suppressed (air suction resistance can be improved). In particular, even when the oil temperature is high and the viscosity of the oil is high, suction of air from the suction port 14d can be suppressed. Thus, in the continuously variable transmission 1, the height of the oil surface of the oil pan 3 can be lowered, so the amount of oil can be reduced. As a result, the oil level of the oil in the oil pan 3 is lowered, the stirring resistance can be reduced, and the fuel consumption can be improved. Moreover, in the continuously variable transmission 1, the weight can be reduced and the cost can be reduced by reducing the amount of oil. Further, in the continuously variable transmission 1, since the oil pump 13 can suppress the intake of air, air biting by the oil pump 13 can be suppressed, and generation of abnormal noise due to air biting, reduction of hydraulic pressure, and the like can be suppressed.

  Moreover, according to the continuously variable transmission 1 according to the present embodiment, even when the oil in the oil pan 3 is biased, the suction port 14d and the discharge port 24 are disposed so as to be inside the oil surface of the oil. Therefore, even when acceleration in any direction is acting on the vehicle and / or when the vehicle is inclined with respect to the horizontal plane, it is possible to suppress suction of air from the suction port 14d. Further, according to the continuously variable transmission 1 according to the present embodiment, since the suction port 14d and the discharge port 24 are inclined, acceleration in any direction is acting on the vehicle or / and the vehicle is in the horizontal plane. Even when it is inclined to the opposite side, the suction port 14d and the discharge port 24 can be kept away from the oil surface, and it is possible to further suppress suction of air from the suction port 14d.

  Further, according to the continuously variable transmission 1 according to the present embodiment, the oil flow path of the oil ducts 22 and 23 has a cross-sectional area smaller than that of the oil flow paths of the oil catch plates 20 and 21. The height difference between the oil surface of the oil in the catch plates 20 and 21 and the oil ducts 22 and 23 and the oil surface of the oil in the oil pan 3 can be generated, and the pressure due to the head difference can be easily generated. . Further, according to the continuously variable transmission 1 according to the present embodiment, the difference between the cross sectional area of the oil flow path of the oil catch plates 20 and 21 and the cross sectional area of the oil flow path of the oil ducts 22 and 23 is adjusted. The magnitude of the pressure due to the head difference (and hence the flow rate of the oil discharged from the outlet 24) can be easily adjusted.

  Further, according to the continuously variable transmission 1 according to the present embodiment, by providing the oil catch plates 20 and 21 along the inner wall surface of the case 2, the oil which flows down along the inner wall surface of the case 2 is the oil catch plate 20. , 21 so that the oil can be efficiently collected by the oil catch plates 20, 21.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, although the above embodiment is applied to a continuously variable transmission (CVT) as a transmission, the invention can also be applied to other transmissions that suck oil from a suction port in an oil pan by the operation of an oil pump such as AT or DCT. It is.

  Although applied to the transmission provided with an oil strainer in the said embodiment, it is applicable also to the transmission which does not have an oil strainer. In this case, an oil suction port is separately provided in the oil pan.

  In the above embodiment, the discharge port of the oil duct is provided along the left, right, and upper portions of the inner periphery of the suction opening of the oil strainer attached directly to the bottom surface of the oil pan. The outlet of the oil duct may be provided along with the outlet, and the outlet may be provided along the entire circumference of the inner periphery of the inlet, or the outlet may not be provided at a predetermined location such as the upper part in the inner periphery. You may The present invention is also applicable to the case where the oil strainer and the suction port of the oil strainer are not attached directly to the bottom of the oil pan. Further, in the above embodiment, the discharge port of the oil duct is continuously opened. However, for example, the discharge port may be opened at predetermined intervals, or may be a discharge port in which a large number of small holes are opened.

  In the above embodiment, the oil catch plates are provided on the left and right inner wall surfaces of the case, but an oil catch plate may be provided on the front and rear inner wall surfaces of the case, for example, the front and rear oil The cross-sectional shape in which the collection port of the catch plate and the collection port of the oil catch plate on both the left and right sides are connected may be a substantially U-shaped or substantially L-shaped collection port, or one space An oil catch plate may be provided on the inner wall surface.

1 Continuously variable transmission (transmission)
2 Case 3 Oil pan 3a Bottom surface 10 Primary pulley 11 Secondary pulley 12 Chain 13 Oil pump 14 Oil strainer 14d Suction port 20, 21 Oil catch plate (oil collecting part)
20a, 21a collection port 22, 23 oil duct (oil guide portion)
24 outlet 24a upper outlet 24b right side outlet 24c left side outlet

Claims (7)

A transmission that sucks in oil from a suction port disposed in an oil pan by the operation of an oil pump,
An oil collection unit having a collection port disposed in a case of the transmission, and collecting oil scattered in the case;
An oil guiding portion having a discharge port disposed in the oil pan, guiding the oil collected by the oil collecting portion to the oil pan, and discharging the oil into the oil pan;
Equipped with
The discharge port faces the suction port and is disposed along an inner circumferential portion of the suction port ,
The suction port is inclined relative to the vertical direction,
The transmission according to claim 1, wherein the discharge port is inclined so as to be substantially parallel to the inclined suction port .   The suction port and the discharge port are located inside the oil surface of oil assumed when acceleration in any direction is acting on the vehicle and / or the vehicle is inclined with respect to the horizontal surface A transmission according to claim 1, characterized in that it is arranged in. The transmission according to claim 1 or 2 , wherein the cross-sectional area of the oil flow passage of the oil guiding portion is smaller than the cross-sectional area of the oil flow passage of the oil collecting portion. The said oil collection part is provided along the inner wall face of the said case, The transmission of any one of the Claims 1-3 characterized by the above-mentioned. An oil strainer provided in the oil pan for capturing foreign matter of the oil sucked by the operation of the oil pump,
The transmission according to any one of claims 1 to 4 , wherein the suction port is a suction port of the oil strainer. The oil strainer is attached directly to the bottom of the oil pan,
The suction port of the oil strainer is disposed along the bottom surface of the oil pan,
The transmission according to claim 5 , wherein the discharge port is disposed along both sides and an upper portion of the inner circumferential portion of the suction port. A transmission that sucks in oil from a suction port disposed in an oil pan by the operation of an oil pump,
An oil collection unit having a collection port disposed in a case of the transmission, and collecting oil scattered in the case;
An oil guiding portion having a discharge port disposed in the oil pan, guiding the oil collected by the oil collecting portion to the oil pan, and discharging the oil into the oil pan;
An oil strainer provided in the oil pan for capturing foreign matter of the oil sucked by the operation of the oil pump;
Equipped with
The discharge port faces the suction port and is disposed along an inner circumferential portion of the suction port,
The suction port is a suction port of the oil strainer,
The oil strainer is attached directly to the bottom of the oil pan,
The suction port of the oil strainer is disposed along the bottom surface of the oil pan,
The transmission according to claim 1, wherein the discharge port is disposed along both sides and an upper portion of the inner circumferential portion of the suction port.

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