Ventilator

Abstract

To properly perform ventilation even at a stop of an engine.SOLUTION: A ventilator comprises: a cover for forming a space in which oil is stored; a vent hole at which the cover is arranged; an on-off valve which can open and close the vent hole; an oil pump which operates in conjunction with an operation of an engine; and a hydraulic circuit arranged at the cover, and transmitting a hydraulic pressure generated by the oil pump to the on-off valve. At the operation of the engine, the oil pump is operated, the hydraulic pressure of the oil pump is transmitted to the on-off valve through the hydraulic circuit, and the vent hole is thereby blocked by the on-off valve. At a stop of the engine, the oil pump is stopped, the hydraulic pressure is not transmitted to the on-off valve, so that the vent port is thereby released by the on-off valve.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ventilation device. [Background technology]

[0002] For example, Patent Document 1 discloses a breather device in which, when the absolute value of the pressure difference between the inside and outside of a transmission case exceeds a predetermined value and the internal pressure of the case increases, a valve element opens and the air inside the case is discharged to the outside. The breather device of Patent Document 1 is also configured to open the valve element when the absolute value of the pressure difference between the inside and outside of the case exceeds a predetermined value and the internal pressure of the case decreases, so that the air outside the case is drawn into the case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 09-310773 Summary of the Invention [Problem to be solved by the invention]

[0004] In the breather device of Patent Document 1, when the absolute value of the pressure difference between the inside and outside of the case is equal to or less than a predetermined value, the valve body is closed and ventilation between the inside and outside of the case is not performed. Here, when the engine is stopped, the absolute value of the pressure difference between the inside and outside of the case becomes small, and the valve body of the breather device is closed. For this reason, when the engine is stopped and the temperature inside the case drops, water vapor inside the case may condense and water may be generated inside the case. If this happens, for example, if oil is present inside the case, the generated water may mix with the oil inside the case, causing a deterioration in the performance of the oil.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a ventilation device that is capable of providing appropriate ventilation even when the engine is stopped. [Means for solving the problem]

[0006] In order to solve the above problem, a ventilation device according to one embodiment of the present invention comprises: A cover that forms a space in which oil is stored; A ventilation hole provided in the cover; an on-off valve capable of opening and closing the vent hole; An oil pump that operates in conjunction with the operation of the engine; a hydraulic circuit provided in the cover for transmitting hydraulic pressure generated by the oil pump to the on-off valve; Equipped with When the engine is in operation, the oil pump operates, and the oil pressure of the oil pump is transmitted to the on-off valve through the hydraulic circuit, thereby closing the vent hole by the on-off valve, When the engine is stopped, the oil pump is stopped and the oil pressure is not transmitted to the on-off valve, causing the on-off valve to open the vent hole. Effect of the Invention

[0007] According to the present invention, it is possible to perform appropriate ventilation even when the engine is stopped. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a ventilation device according to this embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of the ventilation device according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The specific dimensions, materials, numerical values, etc. shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present invention are not shown.

[0010] 1 and 2 are schematic diagrams showing the configuration of a ventilation device 1 according to this embodiment. The ventilation device 1 includes a cover 10, a control valve 12, a harness connector 14, a ventilation port 16, an on-off valve 18, a hydraulic circuit 20, an oil pump 22, a biasing member 24, and an air breather 26. Fig. 1 shows a state in which the ventilation port 16 is closed, and Fig. 2 shows a state in which the ventilation port 16 is open.

[0011] The cover 10 is formed, for example, in a box shape with a closed upper portion and an open lower portion. The cover 10 is attached to a transmission case 30 that houses a transmission such as a continuously variable transmission. The inside of the cover 10 communicates with the inside of the transmission case 30 through an opening at the bottom of the cover 10.

[0012] Oil 32 for lubricating the transmission is contained inside the transmission case 30. The oil 32 inside the transmission case 30 is also contained in at least a portion of a lower region of a space 34 formed by the cover 10. In other words, the cover 10 forms the space 34 in which the oil 32 is stored.

[0013] The control valve 12 is disposed under the cover 10 so that the entire control valve 12 is immersed in oil 32. The control valve 12 includes a solenoid valve.

[0014] The harness connector 14 is disposed above the control valve 12 in the space 34 inside the cover 10. The harness connector 14 is connected to the solenoid valve of the control valve 12 and is also connected to a harness extending to the outside of the cover 10.

[0015] The ventilation hole 16 is provided in the upper part of the cover 10. More specifically, the ventilation hole 16 includes a communication portion 40, a first ventilation hole 42, and a second ventilation hole 44.

[0016] The communication portion 40 forms a space extending in a direction along the top surface of the cover 10. The first ventilation hole 42 communicates between the inside of the cover 10 and the inside of the communication portion 40. The second ventilation hole 44 communicates between the inside of the communication portion 40 and the outside of the cover 10. The first ventilation hole 42 and the second ventilation hole 44 are provided at positions offset from each other in a direction along the top surface of the cover 10. In other words, the ventilation hole 16 is formed in a labyrinth shape by the first ventilation hole 42, the communication portion 40, and the second ventilation hole 44.

[0017] The first ventilation port 42 and the second ventilation port 44 are provided with a filter 46 that allows the passage of air and oil 32 and blocks the passage of dust and contamination.

[0018] The on-off valve 18 is formed, for example, in a columnar shape extending in the extension direction of the communication portion 40 in the vent hole 16. The length of the on-off valve 18 in the extension direction is larger than the inner diameter of the first vent hole 42. The width dimension of the on-off valve 18 in the directions intersecting the extension direction of the on-off valve 18 and the penetration direction of the first vent hole 42 is larger than the inner diameter of the first vent hole 42.

[0019] The on-off valve 18 is disposed at a connection portion between the first ventilation port 42 and the communication portion 40. The on-off valve 18 is configured to be able to open and close the ventilation port 16, more specifically the first ventilation port 42.

[0020] The hydraulic circuit 20 is provided in the cover 10. More specifically, the hydraulic circuit 20 is connected to the control valve 12 and extends from the control valve 12 along the side and top surfaces of the cover 10 to the on-off valve 18.

[0021] The oil pump 22 is coupled to, for example, a crankshaft of the engine 50. The oil pump 22 operates in conjunction with the operation of the engine 50. More specifically, when the engine 50 is in operation, the oil pump 22 is also in operation. When the engine 50 is stopped, the oil pump 22 is also stopped.

[0022] The discharge port of the oil pump 22 is connected to the control valve 12. When the oil pump 22 is in an operating state, it sucks in and compresses oil 32, and delivers the compressed oil 32 from the discharge port. In other words, when the oil pump 22 is in an operating state, it generates hydraulic pressure and supplies the generated hydraulic pressure to the control valve 12. On the other hand, when the oil pump 22 is in a stopped state, the compression of the oil 32 is stopped, and therefore no hydraulic pressure is generated.

[0023] The control valve 12 can distribute the supplied hydraulic pressure to each element of the transmission. The control valve 12 can also switch between supplying and cutting off the hydraulic pressure to each element of the transmission using a solenoid valve. For example, the hydraulic pressure through the control valve 12 can switch between engaging and disengaging the clutch, and change the winding diameter of the pulley of the continuously variable transmission.

[0024] 1, the hydraulic pressure generated by the oil pump 22 is supplied to the hydraulic circuit 20 through the control valve 12. As shown by the dashed-dotted arrow A12 in FIG. 1, the hydraulic circuit 20 transmits the hydraulic pressure supplied from the oil pump 22 through the control valve 12 to the on-off valve 18.

[0025] A packing 52 is provided on a side surface of the on-off valve 18 near the end on the hydraulic circuit 20 side. The packing 52 prevents the oil 32 inside the hydraulic circuit 20 from leaking along the side surface of the on-off valve 18.

[0026] The biasing member 24 is disposed so as to be housed inside the communication portion 40 of the ventilation opening 16. The biasing member 24 is, for example, a spring. Note that the biasing member 24 is not limited to a spring, and may be, for example, a member having elasticity, such as a rubber member, on condition that the communication portion 40 is not completely blocked.

[0027] One of the two ends of the urging member 24 is connected to the cover 10. The other of the two ends of the urging member 24 is connected to an end of the on-off valve 18 opposite to the end to which hydraulic pressure is applied. The urging member 24 urges the on-off valve 18 in the direction opposite to the direction of hydraulic pressure transmitted to the on-off valve 18.

[0028] The air breather 26 is provided near the upper part of a side surface of the cover 10. The air breather 26 opens and closes according to the pressure difference between the inside and outside of the cover 10. The air breather 26 is closed when the absolute value of the pressure difference between the inside and outside of the cover 10 is equal to or less than a predetermined threshold value. The air breather 26 is opened when the absolute value of the pressure difference between the inside and outside of the cover 10 is greater than the predetermined threshold value.

[0029] When the air breather 26 is opened in a state where the pressure inside the cover 10 is greater than the pressure outside, the air in the space 34 inside the cover 10 is sent to the outside. When the air breather 26 is opened in a state where the pressure inside the cover 10 is less than the pressure outside, the outside air is sent into the space 34 inside the cover 10.

[0030] Next, the operation of the on-off valve 18 will be described. When the engine 50 is operating, the oil pump 22 operates as described above. When the oil pump 22 is operating, as shown in Fig. 1, the oil pressure generated by the oil pump 22 is transmitted to the on-off valve 18 through the control valve 12 and the hydraulic circuit 20. Then, as shown in Fig. 1, the on-off valve 18 is moved to a position where it closes the vent port 16 by the oil pressure of the oil pump 22 resisting the biasing force of the biasing member 24. In other words, the on-off valve 18 closes the vent port 16.

[0031] In the ventilation device 1, the vent 16 is closed when the engine 50 is operating, so that a decrease in temperature inside the cover 10 is suppressed. As a result, in the ventilation device 1, it is possible to maintain the temperature of the oil 32 inside the transmission case 30 at an appropriate temperature when the engine 50 is operating.

[0032] On the other hand, when the engine 50 is stopped, as described above, the oil pump 22 is stopped and no hydraulic pressure is generated. Since no hydraulic pressure is generated, the oil 32 inside the hydraulic circuit 20 flows in a direction toward the control valve 12, as shown by the dashed-dotted arrow B10 in FIG. 2. Then, as shown by the dashed-dotted arrow B12 in FIG. 2, the oil 32 that has moved from the hydraulic circuit 20 to the control valve 12 is sent out of the control valve 12. The on-off valve 18 moves in the same direction as the flow of the oil 32 in response to this flow of the oil 32. In other words, when the engine 50 is stopped, no hydraulic pressure is transmitted to the on-off valve 18, and the vent port 16 is opened by the on-off valve 18.

[0033] Furthermore, since no hydraulic pressure is applied to the on-off valve 18 when the engine 50 is stopped, the on-off valve 18 is moved to a position where it opens the vent port 16 by the biasing force of the biasing member 24, as shown in Fig. 2. In other words, when the engine 50 is stopped, the biasing member 24 allows the on-off valve 18 to open the vent port 16 more appropriately.

[0034] When the ventilation opening 16 is opened, the space 34 inside the cover 10 communicates with the outside of the cover 10 through the first ventilation opening 42, the communication portion 40, and the second ventilation opening 44. This allows ventilation between the inside and outside of the cover 10 through the ventilation opening 16. For example, as shown by the solid arrow C10 in FIG. 2, the air inside the cover 10 is sent to the outside of the cover 10 through the ventilation opening 16. That is, in the ventilation device 1, even if water vapor is contained in the air in the space 34 inside the cover 10, the water vapor can be sent to the outside of the cover 10.

[0035] As described above, in the ventilation device 1 of this embodiment, when the engine 50 is operating, the oil pump 22 operates and the oil pressure of the oil pump 22 is transmitted to the on-off valve 18 through the hydraulic circuit 20, causing the on-off valve 18 to close the vent port 16. Also, in the ventilation device 1 of this embodiment, when the engine 50 is stopped, the oil pump 22 stops and the oil pressure is not transmitted to the on-off valve 18, causing the on-off valve 18 to open the vent port 16.

[0036] As a result, in the ventilation device 1 of this embodiment, the ventilation port 16 is opened and closed in response to the oil pressure of the oil pump 22, regardless of the pressure inside the cover 10. Therefore, in the ventilation device 1 of this embodiment, even if the engine 50 is stopped and the pressure difference between the inside and outside of the cover 10 becomes small, the ventilation port 16 is opened in response to the stop of the engine 50, and ventilation between the inside and the outside of the cover 10 can be achieved.

[0037] In the ventilation device 1 of the present embodiment, even if the air breather 26 is closed, water vapor in the air in the space 34 inside the cover 10 can be sent to the outside of the cover 10. That is, in the ventilation device 1 of the present embodiment, even if the temperature of the space 34 inside the cover 10 drops due to the engine 50 being stopped, it is possible to suppress the occurrence of condensation inside the cover 10. As a result, in the ventilation device 1 of the present embodiment, it is possible to suppress the intrusion of water into the oil 32 inside the cover 10, and to suppress the deterioration of the performance of the oil 32.

[0038] Therefore, according to the ventilation device 1 of the present embodiment, it is possible to appropriately perform ventilation regardless of the pressure state inside the cover 10, even when the engine 50 is stopped.

[0039] In the ventilation device 1 of this embodiment, when the engine 50 is operating, the on-off valve 18 is moved to a position to close the ventilation port 16 by the hydraulic pressure of the oil pump 22 resisting the biasing force of the biasing member 24. In the ventilation device 1 of this embodiment, when the engine 50 is stopped, the on-off valve 18 is moved to a position to open the ventilation port 16 by the biasing force of the biasing member 24.

[0040] As a result, in the ventilation device 1 of this embodiment, when the engine 50 is stopped, the on-off valve 18 is moved by the biasing force of the biasing member 24, so that the ventilation port 16 can be opened more appropriately. As a result, in the ventilation device 1 of this embodiment, ventilation can be more appropriately performed even when the engine 50 is stopped.

[0041] In the ventilation device 1 of the present embodiment, the ventilation opening 16 is formed in a labyrinth shape in the cover 10. As a result, in the ventilation device 1 of the present embodiment, it is possible to prevent the oil 32 inside the cover 10 from leaking to the outside through the ventilation opening 16 while the ventilation opening 16 is open.

[0042] Moreover, the ventilation device 1 of this embodiment further includes an air breather 26 in addition to the on-off valve 18. As a result, in the ventilation device 1 of this embodiment, even if the engine 50 is in operation and the vent port 16 is closed by the on-off valve 18, the air breather 26 can communicate the inside and outside of the cover 10 in response to the pressure difference between the inside and outside of the cover 10. As a result, the ventilation device 1 of this embodiment can perform ventilation more appropriately.

[0043] In the ventilation device 1 of the present embodiment, the cover 10 is attached to the transmission case 30. As a result, in the ventilation device 1 of the present embodiment, the water vapor inside the cover 10 is sent to the outside, thereby making it possible to suppress deterioration in the performance of the oil 32 contained inside the cover 10 and inside the transmission case 30.

[0044] Although the embodiment of the present invention has been described above with reference to the attached drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that such examples also naturally belong to the technical scope of the present invention.

[0045] For example, in the above embodiment, the control valve 12 is provided under the cover 10. However, the position of the control valve 12 is not limited to the underside of the cover 10. For example, the control valve 12 may be provided under the transmission case 30. Even in this case, the discharge port of the oil pump 22 may be connected to the hydraulic circuit 20 of the cover 10 via the control valve 12.

[0046] In the above embodiment, the cover 10 is attached to the transmission case 30. However, the cover 10 is not limited to being attached to the transmission case 30. For example, the cover 10 may be attached to the crankcase of the engine 50, for example, as long as it is provided so as to form a space in which oil is stored.

[0047] In the above embodiment, the ventilation opening 16 is formed in a labyrinth shape. However, the ventilation opening 16 is not limited to being formed in a labyrinth shape. For example, the first ventilation opening 42 and the second ventilation opening 44 may be arranged in a straight line. Also, for example, the second ventilation opening 44 and the communication portion 40 may be omitted, and only the first ventilation opening 42 may be provided in the cover 10, and the inside and outside of the cover 10 may be communicated with each other by opening the first ventilation opening 42.

[0048] In the above embodiment, the air breather 26 is provided. However, the air breather 26 may be omitted. [Explanation of symbols]

[0049] 1 Ventilation device 10. Cover 16 Ventilation hole 18 On-off valve 20 Hydraulic circuit 22 Oil pump 24 Pressing member 26 Air Breather 30 Transmission case 50 Engine

Claims

1. A cover that forms a space in which oil is stored; A ventilation hole provided in the cover; an on-off valve capable of opening and closing the vent hole; An oil pump that operates in conjunction with the operation of the engine; a hydraulic circuit provided in the cover for transmitting hydraulic pressure generated by the oil pump to the on-off valve; Equipped with When the engine is in operation, the oil pump operates, and the oil pressure of the oil pump is transmitted to the on-off valve through the hydraulic circuit, thereby closing the vent hole by the on-off valve, When the engine is stopped, the oil pump is stopped and the oil pressure is not transmitted to the on-off valve, thereby causing the on-off valve to open the vent port.

2. a biasing member that biases the on-off valve in a direction opposite to a direction of the hydraulic pressure transmitted to the on-off valve, During operation of the engine, the on-off valve is moved to a position where it closes the vent hole by the oil pressure of the oil pump against the biasing force of the biasing member, 2. The ventilation device according to claim 1, wherein the opening / closing valve is moved to a position for opening the ventilation port by the biasing force of the biasing member when the engine is stopped.

3. The venting device of claim 1 , wherein the vent is formed in a labyrinth shape in the cover.

4. The ventilation device according to claim 1 , further comprising an air breather provided in the cover, the air breather opening and closing in response to a pressure difference between the inside and the outside of the cover.

5. 2. The ventilation device according to claim 1, wherein the cover is attached to a transmission case in which a transmission is housed.

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