JP2015175455A - Oil channel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to separate oil in the course of the flow of oil in an air mixed state in an oil passage effectively using a case inner space and to feed the oil in a satisfactory state from which the air is separated to a predetermined part in a case.SOLUTION: Provided is an oil channel structure in which an oil channel L in which oil flows in one direction is formed by disposing an oil channel formation member within a case of a transmission. The oil channel formation member includes an air vent passage 3 that includes an oil inlet on one end and an oil outlet 11 on the other end as one oil channel L, a constricted portion 13 and a shape change portion 14 tapered so as to gradually reduce an inner space area toward the constricted portion 13 and separating air toward an upper portion are provided halfway along the air vent passage 3, an air vent hole 15 is formed in an upper surface of an upper portion of the shape change portion 14, and the oil outlet 11 serves as a connection port to which a channel to an oil pump for feeding the oil flowing in the air vent passage 3 to a predetermined position in the case can be connected.

Description

  The present invention relates to an oil flow path structure in which an oil flow path forming member is disposed in a case of a transmission that transmits power to a driven part while converting power from a prime mover to form an oil flow path in which oil flows in one direction. It is about.

  Conventionally, in a power transmission path that transmits power from a motor such as an automobile engine to a driven part side such as a wheel while shifting power, oil is used in each part, and the oil is used as a pressure transmission medium, It is used as lubricating oil to protect the meshing of the transmission gear in the mission. Many ideas have been proposed to remove impurities mixed in the oil and to separate the entrained air in the path through which these oils circulate.

  As an example of use in the power transmission path, for example, as shown in Patent Document 1, while using oil to control the operation of power transmission related parts of an automatic transmission (automatic transmission), There is a hydraulic control mechanism (valve body) that changes oil pressure, an oil passage, and the like. In this mechanism, a plurality of openings are provided in an oil passage through which oil flows to release air trapped in a drain chamber.

  Further, as disclosed in Patent Document 2, the oil circuit is used for lubrication, which serves as both lubricating oil for protecting the meshing of the transmission gear in the transmission and hydraulic oil for the actuator that switches the shifting of the transmission gear. There is a device to arrange a bubble separation device that separates air entrained in the process.

  In addition, oil is also supplied to a clutch that plays a role of transmitting and blocking power from a prime mover to the driven part side through the drive transmission path in an automobile, thereby lubricating the clutch.

  For example, a transmission gear is engaged with transmission gears attached to a plurality of rotating shafts in a transmission case, and on a rotating shaft and the rotating shaft, and the power is transmitted to the driven part side. There is a clutch chamber in which a clutch for turning on and off is arranged, and there is a transmission having a structure in which a case of the transmission is divided into a transmission chamber and a clutch chamber by a partition wall. In order to lubricate the clutch in the clutch chamber with oil, a clutch baffle plate adapted to receive oil is provided so as to correspond to the lower part of the clutch, and the oil spreads throughout the clutch when the clutch rotates. ing.

Microfilm of Japanese Utility Model No. 60-153174 (Japanese Utility Model Application No. 62-062051) JP 2009-248002 A

  With regard to supplying and lubricating oil to the clutch in the clutch chamber described above, it is effective to place a baffle plate in the clutch chamber so that the lower portion of the clutch is immersed in the oil. However, since the oil accumulated on the baffle plate is stirred by the clutch that rotates at high speed, the resistance increases or the degree of air mixing into the oil by stirring increases. Furthermore, since the rotating clutch scoops up the oil, breather blowing in the mission case tends to be a problem.

  Therefore, in view of the above circumstances, the present invention can effectively separate the air in the process of the oil in the air mixed state flowing through the oil path by effectively using the space in the mission case without using a device such as a bubble separator. It is an object of the present invention to make it possible to send good oil from which air has been separated to a predetermined portion in a mission case.

  In order to solve the above-described problems, an oil flow path structure according to the present invention provides oil in a case (E) of a transmission (C) that transmits power to a driven part (B) while converting power from a prime mover (A). An oil flow path structure in which a flow path forming member (1) is arranged to form an oil flow path (L) in which oil flows in one direction, and the oil flow path forming member (1) has oil at one end. An air vent passage (3) having an inlet (6) to be fed and an outlet (11) through which oil is discharged at the other end is provided as one oil passage, and the air vent passage (3) is provided in the middle of the air vent passage (3). A throttle portion (13) having a reduced internal space area in a direction intersecting the passage (3) is provided, and the air vent passage (13) is directed from the inlet (6) side toward the throttle portion (13). The internal space area in the intersecting direction gradually decreases A shape changing portion (14) that has a tapered shape and separates air on the upper side is provided, and an air vent hole communicating with the inside of the case (E) is provided on the upper upper surface of the shape changing portion (14). (15) is opened, and the outlet (11) through which the oil in the air vent passage (3) is discharged is oil that sends the oil that has flowed through the air vent passage (3) to a required position in the case (E). The flow path to the pump (P) is a connectable connection port.

  According to the oil flow path structure according to the present invention, in the middle of the air vent path formed of the oil flow path forming member, the throttle portion having a reduced inner space area in the direction intersecting the air vent path, and the inlet side of the air vent path A shape changing part that separates air on the upper side in a tapered shape so as to gradually reduce the inner space area toward the throttle part is provided, so the oil in the air mixed state entering from the inlet of the air vent passage is shaped As the air flows through the changing part, air having a specific gravity smaller than that of oil gathers on the upper side of the shape changing part, and the oil itself immediately flows down to the lower side of the shape changing part. Even if it is not used, air can be easily separated, and good oil without air mixing is sent to the outlet side through the throttle portion.

  And since the air vent hole is opened in the upper upper surface of the shape changing portion, the separated and sequentially gathered air can be smoothly discharged outside the air vent passage, and the separated air is accidentally passed through the throttle portion. The trouble of being sent to the outlet side can be prevented. In addition, since the outlet of the air vent passage is a connection port that can connect the flow path to the oil pump, the mechanical operation that causes the oil-air mixture state, for example, by connecting the flow path to the oil pump to this outlet Good oil can be sent to the part.

  Further, in the present invention, the shape changing portion (14) has an upper surface of the air vent passage (3) inclined downward from the inlet (6) side toward the throttle portion (13), and the oil passage In the height direction of the forming member (1), it is desirable that the throttle portion (13) is disposed at a lower position than the height position of the inlet (6) and the outlet (11).

  According to this configuration, the shape changing portion has a simple shape in which the upper surface of the air vent passage is inclined downward from the inlet side toward the throttle portion, and a space for collecting air on the upper side can be formed with this simple shape. And since the throttle part is made lower than the height position of the inlet of the air vent passage and the height position of the outlet, it is possible to easily prevent the air from flowing from the shape changing part to the outlet side.

  In the present invention, the upper surface of the air vent passage (3) in at least the throttle portion (13) of the upper surface of the air vent passage (3) from the shape changing portion (14) to the throttle portion (13). Further, it is desirable to provide a downward convex portion (16) having the upper surface projecting downward.

  According to this configuration, the oil-mixed oil that has entered the shape-changing portion from the inlet of the air vent passage hits the downward convex portion, so that the oil flow is greatly disturbed, and the enveloping state with respect to the mixed air is easily solved. This further facilitates the separation of air from the oil.

  In the present invention, the air vent passage (3) between the inlet (6) and the outlet (11) is curved in a lateral direction from the inlet (6) toward the outlet (11). It is desirable to be stretched into a shape.

  Centrifugal oil accompanying the rotation of the rotating body is generated in the oil fed to the inlet by the rotation of the rotating body. The centrifugal oil pressure causes a difference in oil density, and the oil and air (bubbles) contained in the oil are separated. On the other hand, according to the above configuration, the air vent passage between the inlet and the outlet extends in a curved line that curves in the lateral direction from the inlet to the outlet. Air can be separated. That is, a relatively weak centrifugal force acts on low-density oil containing air, and a relatively strong centrifugal force acts on high-density oil not containing air. As a result, the oil and the inner side are separated from the outer side and the inner side of the curved air vent passage, respectively. In particular, oil and air can be more effectively separated by a curved line-shaped air vent passage in a high-rotation region of a rotating body that has a high flow rate and is likely to be mixed with air.

  In the present invention, the transmission (C) includes the case (E) having a clutch chamber (G) and a transmission chamber (H) partitioned by a partition wall (F), and the case (E). A rotary shaft (I) that is rotatably supported therein, a clutch (D) that is positioned on the rotary shaft (I) and is positioned in the clutch chamber (G) and rotates in one direction, and the transmission chamber ( H) and a transmission gear attached to the rotation shaft (I), and the oil flow path forming member disposed in the case (E) of the transmission (C) A clutch baffle plate (1) disposed in a position corresponding to a lower portion of the clutch (D) so as to cover a lower outer periphery of the clutch (D) in the clutch chamber (G), the clutch baffle The plate (1) is close to the lower outer periphery of the clutch (D) A plate body (2) comprising a curved portion (4) and an upright portion (5) standing so as to face the clutch (D) continuously to the curved portion (4), and the air vent passage (3) The air vent passage (3) is an end on the downstream side in the oil flow direction due to rotation of the clutch (D) between the plate body (2) and the clutch (D). The plate body (2) passes through an oil passage space (8) formed along the vertical surface (5) of the plate body (2) from an oil receiving space (7) formed on the side of the plate. Over the oil discharge space (9) formed on the side of the upstream end in the oil flow direction between the clutch (D) and the curved portion (4) of the plate body (2). ) Includes an oil opening opened continuously to the oil receiving space (7). And a strainer (S) connected to the oil discharge space (9) is provided in the oil discharge space (9) of the air vent passage (3). It is desirable that an oil discharge port opened so that oil flows out toward a certain flow path is provided as the outlet (11).

  According to this configuration, the oil that has entered the oil receiving opening opened in the curved portion of the plate body of the clutch baffle plate flows into the air vent passage, so that oil does not accumulate around the lower part of the lower part of the clutch. As a result, oil agitation on the lower side of the clutch is reduced, and aeration in which oil air is mixed can be reduced.

  Further, in the present invention, the oil discharge space portion (9) of the air vent passage (3) is a direction along the rotational axis direction of the clutch (D) and the plate body (2) of the baffle plate (1). The oil drainage which extends to the partition wall (F) side of the clutch (D) opposite to the elevation surface portion (5) of the clutch (D) and serves as the outlet (11) of the air vent passage (3). An outlet (11) is located in a space between the clutch (D) and the partition wall (F), and is connected to the oil discharge port (11) to connect the partition wall (F) of the clutch (D). ) Side strainer (S) and air vent passage (3) can be spaced apart in the rotational axis direction of the clutch (D) with the plate body (2) of the baffle plate (1) in between. It is desirable to use a simple configuration.

  According to this configuration, the stroke of the oil flow from the portion where the oil is sent in the air vent passage to the oil discharge port can be lengthened, and the oil flow can be efficiently rectified.

  According to the oil flow path structure of the present invention, air is separated while oil in an air-mixed state flows through the oil path by effectively using the space in the case without using a device such as a bubble separator. It is an object to be able to do this, and good oil from which air has been separated can be sent to a predetermined portion in the case.

It is explanatory drawing which shows roughly the power transmission path | route from an electric motor to a driven part. It is explanatory drawing which shows the clutch baffle plate and clutch in an example in the oil flow path structure of this invention. It is explanatory drawing shown in the state which looked at the clutch baffle plate from the curved part side. It is explanatory drawing shown in the state which looked at the clutch baffle plate from the air vent passage side. It is explanatory drawing which shows the sending of the oil by a clutch in the state seen from the curved part side. It is explanatory drawing which shows schematically the cross-section of the shape change part and throttle part in the oil passage space part of an air vent passage. It is a circuit diagram which shows typically the path | route through which the oil sent out from a clutch baffle plate circulates. It is explanatory drawing which shows arrangement | positioning with the strainer in the return path | route to the clutch of an air vent path and oil from the direction which cross | intersected the clutch rotating shaft direction. It is the figure (plan view) which looked at the air vent passage from the upper part.

  Hereinafter, a case where the oil flow path structure of the present invention is applied to a portion for supplying oil to a clutch of an automobile will be described in detail based on the embodiment. FIG. 1 shows a power transmission path for transmitting the power of a motor A to a driven part B side such as a wheel using a motor engine as a motor A. The power of the motor A is a transmission C having a transmission mechanism K. The power transmitted to the input shaft (rotary shaft) and shifted by the transmission C is schematically shown from the output shaft (rotary shaft) of the transmission C to the driven part B side. In the power transmission path in this example, a clutch D is provided on the power input side of the transmission C so that power can be transmitted and cut off from the prime mover A to the driven part B side. .

  Oil is supplied to the clutch D as lubricating oil, and a clutch baffle plate is used as an oil flow path forming member for flowing in one direction without splashing the oil pumped out from the rotating clutch D. 1 and this clutch baffle plate 1 is provided so as to correspond to the clutch D.

  More specifically, the transmission C provided with the clutch baffle plate 1 will be described in detail. As shown in FIGS. 1 and 2, the transmission case C includes a clutch wall G and a transmission chamber. It is partitioned with H. In the transmission chamber H, the rotation shafts I such as the main shaft (input side), the secondary shaft (output side), and the counter shaft of the transmission mechanism K are rotatably supported, and transmission gears attached to the respective rotation shafts I are provided. A gear shifting mechanism is configured by meshing. The clutch D arranged in the clutch chamber G is connected to a drive shaft on the prime mover A side extending so as to enter the inside of the clutch chamber G, and the rotation shaft on the input side of the transmission chamber H is a partition wall. It extends so as to enter the inside of the clutch chamber G through F and is connected to the other side of the clutch D, and the power of the drive shaft is transmitted to and cut off from the rotary shaft on the input side by the action of the clutch D.

  The clutch baffle plate 1 is attached to the transmission case E inside the clutch chamber G so as to cover the lower part of the clutch D, and is located at a position corresponding to the lower part of the clutch D as shown in FIGS. The plate main body 2 that obtains a space surrounding the clutch D in combination with a clutch outer case (not shown), and the direction along the rotation axis direction of the clutch D and opposite to the transmission chamber H of the plate main body 2 (motor side) ) Is integrated with the air vent passage 3 which is located at (1).

  As described above, the plate main body 2 positioned corresponding to the lower portion of the clutch D is curved according to the shape of the lower outer periphery of the clutch D and close to the lower outer periphery. It is composed of an elevation surface portion 5 raised so as to correspond to the surface on the side opposite to the transmission chamber H of D.

  Further, the air vent passage 3 extends from a side portion (on the transmission case E side) of one end portion of the curved portion 4 to the side of the other end portion of the curved portion 4 along the elevation surface portion 5. This is a passage space that becomes one oil flow path L through which oil flows, and the oil that is mixed in with air is in a state where the air is naturally separated in the middle of this passage, and the oil that is not mixed with air moves to the downstream side of the passage It is a space that can be sent.

  In the illustrated example, the air vent passage 3 is separated from the rotating clutch between the clutch D rotating in one direction and the curved portion 4 toward the downstream end side in the oil flow direction due to the rotation of the clutch D. And an oil receiving space portion 7 that first receives oil coming from an oil receiving port 6 (described later), and an oil passage space portion 8 that is continuous with the oil receiving space portion 7 and extends along the elevation portion 5. And an oil discharge space portion 9 located on the other end side of the curved portion 4 on the upstream side in the oil flow direction between the clutch D and the curved portion 4.

  The oil receiving port 6 is an inlet of the oil passage in the air vent passage 3 as described above. Then, as shown in FIG. 5, the oil receiving port 6 is opened to the curved portion 4 at a position downstream of the clutch D and the curved portion 4 in the oil flow direction. 7 in order to make it easy for the oil flowing in the oil flow direction to be guided from the oil receiving port 6 to the oil receiving space 7, upstream of the oil receiving space 7 in the oil flow direction. The oil receiving port 6 is located, and in the height direction of the clutch baffle plate 1, the oil receiving port 6 is located below the oil receiving space 7.

  Further, the curved portion 4 of the plate body 2 is devised so that the oil is easily guided toward the oil receiving port 6. As shown in FIG. 5, the inclined surface reaches the oil receiving port 6 from the upstream side in the oil flow direction in the vicinity of the oil receiving port 6 in the bending portion 4, and the distance between the clutch D and the bending portion 4 is the oil receiving port. An inclined portion 10 that gradually expands toward the end is provided. The distance between the clutch D and the curved portion 4 on the upstream side in the oil flow direction from the inclined portion 10 and the distance between the clutch D and the curved portion 4 on the downstream side in the oil flow direction from the inclined portion 10 are inclined. The distance between the clutch D and the bending portion 4 at the portion 10 is smaller.

  Thus, in the oil flow direction, a portion where the distance between the clutch D and the bending portion 4 is narrow, a portion where the interval between the clutch D and the bending portion 4 is gradually widened by the inclined portion 10 and is connected to the oil receiving port 6, and Then, since the portion where the distance between the clutch D and the bending portion 4 is narrow is arranged in order, the oil in a state where the centrifugal force is received from the rotating clutch D reaches the position of the inclined portion 10, so that the clutch D The oil receiving port 6 enters the oil receiving port 6 without being reduced by moving along the inclined portion 10 smoothly and surely, and further without reducing the pressure or momentum of the oil received from the rotating clutch D. After passing through 6, the oil flows through the oil receiving space portion 7 to the oil passing space portion 8 while receiving the pressure of feeding.

  An oil discharge port 11 is provided in the oil discharge space 9 of the air vent passage 3 as an outlet of the oil flow path L. The oil discharge port 11 is a portion that is opened so that oil flows out toward a strainer S, which will be described later, connected to the oil discharge space portion 9, and a flow path including the strainer S and the oil pump P that follows the strainer S is provided. It is a connectable connection port. 2 and 5 indicates a pipe connecting the strainer S and the oil pump P.

  Thus, the oil receiving space portion 7, the oil passage space portion 8, and the oil discharge space portion 9 are connected to each other, and an oil receiving port 6 is opened as an oil inlet in the oil receiving space portion 7, and the oil outlet space 9 has an oil outlet. As the oil discharge port 11 is opened to form one oil flow path L according to the oil flow path structure of the present invention, the oil passing through the oil receiving port 6 in response to the pressure of the feed from the rotating clutch D is The oil flows toward the oil discharge port 11 with a momentum of the pressure of the feeding, and the oil flows from the oil discharge port 11 to the strainer S side with a certain pressure.

  Since the oil sequentially fed from the rotating clutch D enters the oil receiving port 6 in an air mixed state in which air is mixed, the air is naturally separated from the oil fed in the air mixed state in which air is mixed as described above. An air vent passage 3 is provided. In the case of providing an oil pump P for returning oil to the clutch D side downstream of the strainer S by the air vent passage 3 so that oil without air mixing flows into the strainer S in a positive pressure state. The oil pump P has an effect of properly sending the oil toward the clutch D without biting the air.

  As shown in FIG. 9, the air vent passage 3 between the inlet 6 and the outlet 11 extends in a curved line shape that curves in the lateral direction from the inlet 6 toward the outlet 11 in a plan view. As a result, the air vent passage 3 between the inlet 6 and the outlet 11 is a lateral semicircular arc passage surrounding the outer periphery of the clutch D.

  Centrifugal oil accompanying the rotation of the clutch D is generated in the oil fed to the inlet 6 by the rotation of the clutch D. The centrifugal oil pressure causes a difference in the density of the oil, and the oil and the air (bubbles) contained in the oil are separated. On the other hand, in the clutch baffle plate 1 of the present embodiment, the air vent passage 3 between the inlet 6 and the outlet 11 extends in a curved line shape that curves laterally from the inlet 6 toward the outlet 11 as described above. Therefore, the air can be separated from the oil passing through the air vent passage 3. That is, a relatively weak centrifugal force acts on low-density oil containing air, and a relatively strong centrifugal force acts on high-density oil not containing air. As a result, oil and air flow separately in the outer path R1 and the inner path R2 of the curved line-like air vent passage 3, respectively. Then, the air separated into the inner path L2 is discharged from the air vent hole 15 to the outside of the air vent passage 3. In particular, in the high rotation region of the clutch D where the flow rate of oil is fast and air is likely to be mixed in, the oil and air can be more effectively separated by the curved air vent passage 3.

  In this embodiment, the clutch baffle plate 1 is connected to the strainer S into which the oil sent from the clutch baffle plate 1 enters and the path from which the oil from the strainer S enters and returns the oil toward the clutch D. The oil itself is used to play a role of lubrication while visiting the required part.

  FIG. 7 is a circuit diagram schematically showing a path through which oil fed from the clutch baffle plate 1 circulates. As shown in the figure, the oil discharged from the oil pump P is guided to a hydraulic circuit (hydraulic control device) T for controlling each part of the transmission. The oil leaving the hydraulic circuit is cooled by exchanging heat with the oil cooler U, then guided to the clutch D, and received by the plate body 2 of the clutch baffle plate 1 provided corresponding to the clutch D. The oil received by the plate body 2 is guided to the air vent passage 3 of the clutch baffle plate 1 where air (air) mixed in the oil is separated. Thereafter, the oil is sucked into the oil pump P through the strainer S. The oil circulating in the circuit shown in the figure is oil for lubrication such as the clutch D and the hydraulic circuit, and this circuit is a circulation circuit dedicated to the lubricating oil. The transmission of the present embodiment is provided with an oil circulation path through which oil as hydraulic oil for the transmission mechanism and the like circulates separately from the circuit shown in FIG.

  Then, as shown in FIG. 6, the oil that moves from the oil receiving space portion 7 side toward the oil discharge space portion 9 side in the oil passage space portion 8 with respect to the oil in the air mixed state that has received the pressure of feeding The air is separated in the middle of the feed path 12 (oil flow path L), and in order to perform the separation of the air, it approaches the oil discharge space 9 side in the oil feed path 12. The throttle part 13 is provided at the lowest position in the oil passage space 9 and the lowest part in the oil flow path L, and the throttle part 13 from the oil receiving space part 7 side. A shape changing portion 14 is provided toward the head.

  The throttle 13 is formed with the smallest internal space area of the oil passage space 9 in the direction intersecting the oil feed path 12. Further, the shape changing portion 14 is tapered toward the throttle portion 13, and the upper surface of the oil passage space portion 8 is inclined downward from the oil receiving space portion 7 side toward the throttle portion 13, so that the oil feeding path 12, the inner space area in the direction crossing 12 gradually decreases as it approaches the narrowed portion 13 side.

  The shape changing portion 14 is configured to have a shape in which a large space spreads downward on the upstream side of the oil feeding path 12, but only the upper portion of the shape changing portion 14 is continuous with the oil receiving space portion 7, The oil is moved as if oil (air mixed oil) immediately after entering the shape changing portion 14 from the oil receiving space portion 7 is diffused inside the shape changing portion 14.

  In FIG. 6, the dotted arrow indicating the oil feeding path 12 only schematically represents the oil moving direction in the oil passage space portion 8, and the oil receiving space is formed in the shape changing portion 14. The oil sent from the part 7 has a diffusing motion. Then, if the oil sent to the shape change part 14 having a wide inner space moves in an air-mixed state, the air having a small specific gravity moves to the upper space side of the shape change part 14 in the process of movement, and the air In comparison, the oil having a higher specific gravity moves to the lower space side of the shape changing portion 14.

  The height position of the upper portion of the throttle portion 13 is set to be lower than the lower position of the space where a large amount of air gathers in the shape changing portion 14. Therefore, a large amount of air that has gathered is blocked by the throttle 13 and does not move downstream of the oil feed path 12, but only the oil is directed along the oil feed path 12 toward the oil discharge space 9. . As described above, the presence of the throttle portion 13 and the shape changing portion 14 are tapered while the upper surface is inclined downward toward the throttle portion 13, so that in the process of moving the oil feed path 12, air and oil Are separated.

  In addition, an air vent hole 15 communicating with the inside of the clutch chamber G is opened on the upper upper surface of the shape changing portion 14, and the above-mentioned upper space where the air separated from the oil gathers in the shape changing portion 14 is located via the air vent hole 15. Are provided to communicate with the clutch chamber G. Since the air vent hole 15 is opened in the upper upper surface of the shape changing portion 14 in this way, the air separated from the air-mixed oil fed from the oil receiving space portion 7 is the upper space of the shape changing portion 14. As a result, the air gathers to the side and is sequentially discharged from the air vent hole 15 into the clutch chamber G. Therefore, only the oil from which air has escaped passes through the throttle portion 13 and is sent from the oil discharge port 11 of the oil discharge space portion 9 to the flow path side where the strainer S and the like are located.

  As shown in FIG. 6, on the upper surface from the shape changing portion 14 to the throttle portion 13, a downward convex portion 16 that protrudes downward at the front edge position of the throttle portion is provided. . As described above, the oil in the air-mixed state that has entered the shape changing portion 14 from the oil receiving space portion 7 reaches the inclined upper surface while being in a diffused state, and flows down this portion. Since the downward convex portion 16 is provided on the downwardly inclined upper surface of the oil passage space portion 8, the downward convex portion 16 comes into contact with the downward convex portion 16.

  Then, when the oil flow in the air-mixed state hits the downwardly projecting portion 16, the flow is greatly disturbed, and it becomes easy to unwrap the mixed air, thereby further promoting the separation of the air from the oil. Is done. Note that the position where the downward convex portion 16 is provided is not limited to the front edge position of the aperture portion 13, and may be any portion on the upper surface from the shape changing portion 14 to the aperture portion 13. Moreover, the place where the downward convex part 16 is provided is not limited to one place, and may be a plurality of places. Further, since the state of enveloping air by the oil collision is easily solved, an upward convex portion 17 may be provided on the bottom surface of the shape changing portion 14 as shown in the figure as an obstacle to which the oil collides.

  The oil passage space 8 of the air vent passage 3 and the flow path having the strainer S and the like following the oil discharge port 11, specifically, the portion for returning the oil from the strainer S connected to the oil discharge port 11 to the clutch D With the arrangement away from the path up to, the oil flow stroke from the portion of the oil passage space 8 where the air is separated to the oil discharge port 11 becomes long, and the oil flow can be efficiently rectified.

  In order to do so, in the present embodiment, as shown in FIG. 8, the oil discharge space 9 of the air vent passage 3 is in a direction along the rotation axis direction Q of the clutch D, and the plate body 2 stands upright. Opposite to the surface portion 5, it extends to the partition wall F side of the clutch D. The oil discharge port 11 of the oil discharge space 9 is positioned so as to face the space between the clutch D and the partition wall F.

  In this way, the strainer connected to the oil discharge port 11 and arranged on the partition wall F side of the clutch D and the oil passage space 8 of the air vent passage portion 3 are located between the plate body 2 and the shaft of the rotary shaft Q of the clutch. They are spaced apart in the direction so that the stroke of the oil flow is lengthened and the oil flow is efficiently rectified.

  As described above, the oil flow path structure of the present embodiment has a clutch baffle plate that is an oil flow path forming member in the case E of the transmission C that converts the power from the prime mover A and transmits it to the driven part B. 1 is an oil flow path structure in which an oil flow path L in which oil flows in one direction is formed. The clutch baffle plate 1 has an oil receiving port 6 as an inlet through which oil is fed to one end and the other. An air vent passage 3 having an oil discharge port 11 as an outlet through which oil is discharged is provided as one oil flow path. Further, in the middle of the air vent passage 3, a throttle portion 13 having a reduced internal space area in a direction intersecting the air vent passage 3 is provided, and intersects the air vent passage 13 from the oil receiving port 6 side toward the throttle portion 13. A shape changing portion 14 is provided on the upper side so as to have a tapered shape so that the inner space area in the direction to be gradually reduced. An air vent hole 15 communicating with the inside of the mission case E is opened on the upper upper surface of the shape changing portion 14. Further, the oil discharge port 11 through which oil is discharged in the air vent passage 3 is a connection port to which a flow path to the oil pump P for sending the oil that has flowed through the air vent passage 3 to a required position in the case E can be connected. Yes.

  According to these configurations, in the middle of the air vent passage 3 provided in the clutch baffle plate 1, the throttle portion 13 having a reduced internal space area in the direction intersecting the air vent passage 3, and the oil receiving port 6 side of the air vent passage 3. Since the shape changing portion 14 that separates air is provided on the upper side in a tapered shape so as to gradually reduce the inner space area toward the throttle portion 13, oil in an air mixed state that has entered from the oil receiving port 6 is provided. As the air flows through the shape changing portion 14, air having a specific gravity smaller than that of oil gathers on the upper side of the shape changing portion 14, and the oil itself immediately flows down to the lower side of the shape changing portion 14, so that a bubble separator or the like The air can be easily separated without using a separate device, and good oil without air mixing can be sent to the oil outlet 11 side through the throttle 13. .

  Further, since the air vent hole 15 is opened on the upper upper surface of the shape changing portion 14, the separated and sequentially gathered air can be smoothly discharged to the outside of the air vent passage 3, and the separated air passes through the throttle portion 13. The problem of being sent to the oil discharge port 11 side can be prevented. Furthermore, since the oil discharge port 11 is a connection port that can connect the flow path to the oil pump P, connecting the flow path to the oil pump P to the oil discharge port 11 allows the oil to be mixed with air. Good oil can be sent to the machine operating part that causes

  Further, in the oil flow path structure of the present embodiment, the shape changing portion 14 of the air vent passage 3 is inclined so that the upper surface of the air vent passage 3 is inclined downward from the oil receiving port 6 side toward the throttle portion 13. In the height direction, the throttle portion 13 is disposed below the height position of the oil receiving port 6 and the oil discharge port 11.

  According to this configuration, the shape changing portion 14 has a simple shape in which the upper surface of the air vent passage 3 is inclined downward from the oil receiving port 6 side toward the throttle portion 13, and in this simple shape, a space in which air collects on the upper side. Can be formed. Since the throttle portion 13 is set lower than the height position of the oil receiving port 6 and the height of the oil discharge port 11 in the air vent passage 3, air can be easily circulated from the shape changing portion 14 to the oil discharge port 11 side. Will be able to prevent.

  Further, in the oil flow path structure of the present embodiment, at least the upper surface of the air vent passage 3 from the shape changing portion 14 to the throttle portion 13 and the upper surface of the air vent passage 3 at the throttle portion 13 is directed downward. A downward projecting portion 16 is provided.

  According to this configuration, the oil mixed state that has entered the shape changing portion 14 of the air vent passage 3 from the oil receiving port 6 hits the downward projecting portion 16, so that the oil flow is greatly disturbed, and the entrapment of the mixed air is prevented. The condition becomes easier to unravel, which further facilitates the separation of air from the oil.

  In the present embodiment, the transmission C includes a transmission case E having a clutch chamber G and a transmission chamber H partitioned by a partition wall F, and a rotation shaft I that is rotatably supported in the transmission case E. The transmission includes a clutch D that is positioned on the rotation shaft I and located in the clutch chamber G and rotates in one direction, and a transmission mechanism K provided on the rotation shaft I in the transmission chamber H. In addition, the oil flow path forming member disposed in the transmission case E of the transmission C is a clutch disposed in a position corresponding to the lower portion of the clutch D so as to cover the outer periphery of the lower portion of the clutch D in the clutch chamber G. This is a baffle plate 1. The clutch baffle plate 1 includes a plate main body 2 including a curved portion 4 that is close to the outer periphery of the lower portion of the clutch D, and an elevated surface portion 5 that is erected and faces the clutch D continuously from the curved portion 4. The air vent passage 3 is integrated with the air vent passage 3 and is formed on the side of the downstream end of the oil flow direction by the rotation of the clutch D between the plate body 2 and the clutch D. Formed on the side of the upstream end of the oil flow direction between the plate body 2 and the clutch D through the oil passage space 8 formed along the elevation 5 of the plate body 2 from the oil receiving space 7 Over the oil discharge space 9 formed. In addition, the curved portion 4 of the plate body 2 is provided with an oil receiving port 6 that is opened to be continuous with the oil receiving space portion 7, and the oil discharge space portion 9 of the air vent passage 3 is provided with the oil discharge space 9. An oil discharge port 11 opened so that oil flows out toward a flow path having a strainer S connected to the space 9 is provided.

  According to this configuration, the oil that has entered the oil receiving opening 6 opened in the curved portion 4 of the plate body 2 of the clutch baffle plate 1 flows into the air vent passage 3, and the oil accumulates around the lower outer periphery of the clutch D. Nothing will happen. As a result, oil agitation on the lower side of the clutch D is reduced, and aeration in which oil air is mixed can be reduced.

  Further, in the present embodiment, the oil discharge space portion 9 of the air vent passage 3 is in a direction along the axial direction of the rotation shaft Q of the clutch D and is opposite to the elevation surface portion 5 of the plate body 2 of the baffle plate 1. The oil discharge port 11 of the air vent passage 3 is located in the space between the clutch D and the partition wall F, and is connected to the oil discharge port 11 to be connected to the clutch D. The strainer S and the air vent passage 3 arranged on the partition wall F side of the baffle plate 1 are configured to be separated from each other in the rotation axis direction of the clutch D with the plate body 2 of the baffle plate 1 therebetween.

  According to this configuration, the stroke of the oil flow from the portion where the oil is sent in the air vent passage 3 to the oil discharge port 11 can be lengthened, and the oil flow can be efficiently rectified.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Deformation is possible.

A ... prime mover B ... driven part C ... transmission D ... clutch E ... mission case F ... partition wall G ... clutch chamber H ... transmission chamber I ... rotating shaft P ... oil pump Q ... clutch rotating shaft direction R ... piping L ... Oil channel 1 ... Clutch baffle plate (oil channel forming member)
2 ... Plate body 3 ... Air vent passage 4 ... Curved portion (of plate body) 5 ... Elevated surface portion (of plate body) 6 ... Oil receiving port (inlet)
7 ... Oil receiving space part 8 ... Oil passage space part 9 ... Oil discharge space part 10 ... Inclined part 11 ... Oil discharge port (outlet)
DESCRIPTION OF SYMBOLS 12 ... Oil feeding path 13 ... Restriction part 14 ... Shape change part 15 ... Air vent hole 16 ... Downward convex part

Claims (6)

An oil flow path structure in which an oil flow path forming member is disposed in a case of a transmission that transmits power to a driven part while converting power from a prime mover, and an oil flow path in which oil flows in one direction,
The oil flow path forming member includes, as the oil flow path, an air vent passage having an inlet through which oil is fed at one end and an outlet through which oil is discharged at the other end.
In the middle of the air vent passage, a throttle portion having a reduced internal space area in a direction intersecting the air vent passage is provided, and an inner space in a direction intersecting the air vent passage from the inlet side toward the throttle portion A shape changing part that separates air on the upper side in a tapered shape so that the area gradually decreases is provided,
An air vent hole communicating with the inside of the case is opened on the upper upper surface of the shape changing portion,
The outlet from which oil in the air vent passage is discharged is a connection port that can be connected to a flow path to an oil pump that sends oil flowing through the air vent passage to a required position in the case. Oil flow path structure. In the shape changing portion, the upper surface of the air vent passage is inclined downward from the inlet side toward the throttle portion, and the throttle portion is formed between the inlet and the outlet in the height direction of the oil flow path forming member. The oil flow path structure according to claim 1, wherein the oil flow path structure is disposed at a lower position than the height position. Of the upper surface of the air vent passage from the shape changing portion to the throttle portion, at least the upper surface of the air vent passage at the throttle portion is provided with a downward convex portion that protrudes downward from the upper surface. The oil flow path structure according to claim 1 or 2, wherein 4. The air vent passage between the inlet and the outlet extends in a curved line shape that curves in a lateral direction from the inlet toward the outlet. 5. Oil channel structure as described in 2. The transmission includes the case having a clutch chamber and a transmission chamber partitioned by a partition wall, a rotating shaft that is rotatably supported in the case, and a position on the rotating shaft and in the clutch chamber. And a transmission that has a clutch that rotates in one direction and a speed change mechanism that is provided on the rotary shaft in the speed change chamber,
The oil flow path forming member disposed in the case of the transmission is a clutch baffle plate disposed in a position corresponding to a lower portion of the clutch so as to cover an outer periphery of the lower portion of the clutch in the clutch chamber. And
The clutch baffle plate has a plate body composed of a curved portion adjacent to the outer periphery of the lower portion of the clutch, and an elevated surface portion that is erected and faces the clutch, and the air vent passage. And
The air vent passage extends from an oil receiving space formed on the side of the downstream end of the oil flow direction by rotation of the clutch between the plate body and the clutch along the vertical surface of the plate body. Over the oil discharge space formed on the side of the upstream end of the oil flow direction between the plate body and the clutch through the oil passage space formed in the
The curved portion of the plate main body is provided with an oil receiving port that is opened to be continuous with the oil receiving space portion as the inlet,
The oil discharge space portion of the air vent passage is provided with an oil discharge port, which is opened so that oil flows out toward a flow path having a strainer connected to the oil discharge space portion, as the outlet. The oil flow path structure according to any one of claims 1 to 4, wherein the oil flow path structure is provided. The oil discharge space portion of the air vent passage extends in the direction along the rotational axis direction of the clutch and extends to the partition wall side of the clutch opposite to the elevation portion of the plate body of the baffle plate. Provided, the oil discharge port which is the outlet of the air vent passage is located in a space between the clutch and the partition wall,
A configuration in which a strainer connected to the oil discharge port and disposed on the partition wall side of the clutch and the air vent passage can be spaced apart from each other in the rotation axis direction of the clutch with the plate body of the baffle plate interposed therebetween. The oil flow path structure according to claim 5, wherein

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