Oil pressure supply device

Abstract

The oil pressure supply device of the present application includes a first oil pump that operates by a driving source for running of a vehicle, a second oil pump that operates by an electric motor different from the driving source for running and is switched between operation and stop according to a running condition of the vehicle, a pressure regulating circuit that regulates oil pressure generated by the first oil pump and the second oil pump and supplies the oil chamber, an oil passage that connects the second oil pump with an oil source, and a check valve provided in the oil passage.

Description

Technical Field

[0001] This invention relates to a hydraulic supply device. Background Technology

[0002] The hydraulic supply device disclosed in Japanese patent JP2016-79992A, which supplies hydraulic pressure to automatic transmissions, has two pumps: a mechanical hydraulic pump operated by the engine and an electric hydraulic pump operated by an electric motor. The hydraulic supply device supplies hydraulic pressure using or switching between the mechanical and electric hydraulic pumps depending on the vehicle's driving conditions.

[0003] The electric oil pump draws oil from the oil reservoir formed in the oil pan via the oil passage. When the electric oil pump stops and oil drawing ceases, air entering from gaps between components or from the filter that filters the oil enters the oil passage, causing oil to leak out. Consequently, when the electric oil pump is restarted, it may draw air from the oil passage, running idle until the air is expelled, thus delaying oil discharge.

[0004] It is required to prevent air from entering the oil circuit connecting the electric oil pump and the oil reservoir, and to improve the responsiveness of the electric oil pump. Summary of the Invention

[0005] According to one aspect of the present invention, a hydraulic supply device is provided, comprising:

[0006] The first oil pump is operated by the vehicle's driving power source;

[0007] The second oil pump operates via an electric motor, which is different from the driving source for the vehicle, and switches between operation and stop depending on the driving conditions of the vehicle.

[0008] The pressure regulating circuit regulates the oil pressure generated by the first oil pump and the second oil pump and supplies it to the oil chamber;

[0009] The oil circuit connects the second oil pump to the oil source;

[0010] A check valve is installed in the oil circuit.

[0011] The above method can prevent air from entering the oil circuit connecting the electric oil pump and the oil source, thereby improving the responsiveness of the electric oil pump. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a belt-driven continuously variable transmission (CVT).

[0013] Figure 2 This is a schematic diagram illustrating the structure of a hydraulic supply device.

[0014] Figure 3This is a diagram illustrating the specific structure of a check valve installed in an oil circuit.

[0015] Figure 4 yes Figure 3 An enlarged view of the area around the check valve.

[0016] Figure 5 This is a diagram illustrating the specific structure of a check valve installed in an oil circuit.

[0017] Figure 6 This diagram illustrates the operation of the check valve when the electric oil pump is running.

[0018] Figure 7 This diagram illustrates the operation of the check valve when the electric oil pump stops.

[0019] Figure 8 This diagram serves as a comparative example illustrating the situation where no check valve is installed in the oil circuit. Detailed Implementation

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic structural diagram of the belt-type continuously variable transmission 1.

[0022] Figure 2 This is a schematic diagram showing the structure of the hydraulic supply device 2.

[0023] like Figure 1 As shown, the belt-type continuously variable transmission 1 used in vehicles has the following as a transmission mechanism: a pair of pulleys, a primary pulley P1 and a secondary pulley P2; and an annular belt B wound around the pair of pulleys.

[0024] In the belt-type continuously variable transmission 1, the speed ratio of the rotation transmitted between the primary pulley P1 and the secondary pulley P2 is changed by changing the winding radius of the belt B of the primary pulley P1 and the secondary pulley P2.

[0025] The winding radius of belt B of primary pulley P1 and secondary pulley P2 is changed by adjusting the oil pressure supplied to the respective attached oil chambers R1 and R2.

[0026] The belt-type continuously variable transmission 1 has a hydraulic supply device 2. The hydraulic supply device 2 regulates the hydraulic pressure generated by the mechanical oil pump 3 and the electric oil pump 4 through the pressure regulating circuit 70 and supplies it to the oil chambers R1 and R2.

[0027] The mechanical oil pump 3 is an oil pump driven by rotation input from a vehicle drive source such as an engine. The mechanical oil pump 3 is linked to the operation and stop of the vehicle drive source, thus switching its operation and linkage. The electric oil pump 4 is driven by rotation input from an electric motor located separately from the vehicle drive source. The operation and stop of the electric oil pump 4 are switched by switching the operation and stop of the electric motor using a control device (not shown).

[0028] The electric oil pump 4 can also operate in place of the mechanical oil pump 3 when the vehicle stops, such as when it is idling. Alternatively, it can operate in conjunction with the mechanical oil pump 3 in situations requiring high oil pressure, such as downshifting in the belt-driven continuously variable transmission 1.

[0029] like Figure 2 As shown, the belt-type continuously variable transmission 1 has a gearbox 5 that houses the transmission mechanism. An oil pan 6 for storing oil OL is provided at the lower part of the gearbox 5 in the vertical direction VL. The oil pan 6 covers the lower opening of the gearbox 5. An oil reservoir PL, serving as an oil source, is formed within the oil pan 6. A mechanical oil pump 3 and an electric oil pump 4 draw oil OL from the oil reservoir PL.

[0030] Due to layout constraints, the transmission 5 is positioned at an angle, with the front end higher than the rear end in the vehicle's longitudinal direction. The oil pan 6 mounted on the transmission 5 is also angled upwards from the rear end towards the front end in the vehicle's longitudinal direction.

[0031] Inside the oil pan 6, the control valve body 7 is configured to be fixed to the lower part of the gearbox 5. A pressure regulating circuit 70 is built into the control valve body 7 (see reference). Figure 1 ).

[0032] A filter 8 is fixed at the lower part of the control valve body 7. The filter 8 has an oil inlet 81 at the lower part and an oil filter F inside to filter the oil OL.

[0033] Mechanical oil pump 3 and electric oil pump 4 are positioned above filter 8 in the vertical direction VL. Figure 2 In order to make it easier to understand the positional relationship, the mechanical oil pump 3 and the electric oil pump 4 are schematically illustrated in circles. The suction ports 31 and 41 shown in the diagram are also schematic structures that only indicate the position.

[0034] Mechanical oil pump 3 and electric oil pump 4 are respectively connected to oil passages 21 and 22 located inside the control valve body 7 (see reference). Figure 1 The oil OL stored in the oil pan 6 is drawn through the filter 8.

[0035] The mechanical oil pump 3 is positioned at the rear end of the filter 8 in the longitudinal direction of the vehicle, while the electric oil pump 4 is positioned at the front end. The mechanical oil pump 3 and the electric oil pump 4 are arranged along mutually parallel line segments X1 and X2. However, since the mechanical oil pump 3 and the electric oil pump 4 are positioned above the inclined filter 8, the straight line La, which is orthogonal to line segments X1 and X2, is inclined at a specified angle θ relative to the horizontal line HL.

[0036] With this tilt, the lower part of the mechanical oil pump 3, located at the rear end of the upper part of the filter 8, is in the liquid within the oil reservoir PL, while the lower part of the electric oil pump 4 is in the air above the liquid surface of the oil reservoir PL.

[0037] like Figure 1 As shown, the mechanical oil pump 3 and the electric oil pump 4 are respectively provided with oil inlets 31 and 41, and the filter 8 is provided with connection ports 82 and 83. The inlets 31 and 41 and the connection ports 82 and 83 are connected via oil passages 21 and 22, respectively.

[0038] like Figure 2 As shown, due to the tilt of the filter 8, the suction port 31 located at the lower part of the mechanical oil pump 3 is situated in the liquid of the oil storage section PL, while the suction port 41 located at the lower part of the electric oil pump 4 is situated in the air. Furthermore, because... Figure 1 This is a schematic diagram. For convenience, the suction port 31 of the mechanical oil pump 3 is also shown above the oil storage section PL.

[0039] like Figure 1 As shown, a check valve 91 is provided in the oil passage 22, which connects the suction port 41 of the electric oil pump 4 and the connection port 83 of the filter 8, as a valve device to prevent the backflow of oil OL in the oil passage 22 when the electric oil pump 4 stops.

[0040] The oil OL drawn in by the mechanical oil pump 3 and the electric oil pump 4 is supplied to the pressure regulating circuit 70 through oil passages 23 and 24 from their respective discharge ports 32 and 42.

[0041] Check valves 92 and 93 are installed in oil circuits 23 and 24. Check valve 92 is a valve device that prevents the backflow of oil OL in oil circuit 23 when the mechanical oil pump 3 stops. Check valve 93 is a valve device that prevents the backflow of oil OL in oil circuit 24 when the electric oil pump 4 stops.

[0042] The detailed structure and operation of check valves 91, 92, and 93 will be described later.

[0043] The voltage regulating circuit 70 has: based on the formation in the control valve body 7 (refer to...) Figure 2 The solenoid is driven by an instruction (energization) from an internal control device (not shown), and the pressure regulating valve is actuated by a signal pressure generated by the solenoid.

[0044] The first pressure regulating valve 71 adjusts the pipeline pressure (main pressure) according to the oil pressure generated by the electric oil pump 4 by adjusting the discharge volume of oil OL in the first pressure regulating valve 71. In addition, the first pressure regulating valve 71 supplies a portion of oil OL, which is a component of the lubricating belt-type continuously variable transmission 1, to the gearbox 5 (see reference). Figure 2 (Internal supply)

[0045] The pipeline pressure adjusted by the first pressure regulating valve 71 is supplied to the second pressure regulating valve 72, the primary pressure regulating valve 73 and the secondary pressure regulating valve 74.

[0046] The second pressure regulating valve 72 adjusts the pilot pressure according to the pipeline pressure.

[0047] The pilot pressure, adjusted by the second pressure regulating valve 72, is supplied to the solenoid 75 on the primary pulley P1 side and the solenoid 76 on the secondary pulley P2 side.

[0048] Solenoids 75 and 76 are connected to the primary pressure regulating valve 73 and the secondary pressure regulating valve 74, respectively. Solenoids 75 and 76 are controlled by a control device (not shown) to adjust the supplied pilot pressure to the desired signal pressure and supply it to the primary pressure regulating valve 73 and the secondary pressure regulating valve 74.

[0049] The primary pressure regulating valve 73 and the secondary pressure regulating valve 74 regulate the pipeline pressure supplied from the first pressure regulating valve 71 to the operating pressure according to the signal pressure and supply it to the oil chambers R1 and R2.

[0050] Figure 3 This is a diagram illustrating the specific structure of the check valve 93 installed in the oil circuit 24.

[0051] Figure 4 yes Figure 3 Enlarged view of the area around check valve 93.

[0052] In the following description, the direction in which oil OL is transported from the oil storage section PL to the pressure regulating circuit 70 by the suction of the electric oil pump 4 is referred to as the oil transport direction. Figure 3 The diagram shows the upstream end 24a (hereinafter referred to as "upstream end 24a") of the oil passage 24 connected to the outlet 42 of the electric oil pump 4 in the oil delivery direction.

[0053] like Figure 3 As shown, the oil passage 24 is mainly formed inside the control valve body 7, but the upstream end 24a is formed inside the wall portion 51 that extends from the gearbox 5 toward the control valve body 7 and is connected to the control valve body 7.

[0054] The control valve body 7 has a cylindrical wall portion 77 surrounding the outer periphery of the oil passage 24, and the front end portion 511 of the wall portion 51 is fitted into the outer periphery of the front end of the cylindrical wall portion 77. Thus, the inner periphery of the cylindrical wall portion 77 communicates with the interior of the wall portion 51. The oil passage 24 is connected to the interior of the control valve body 7 from the upstream end portion 24a formed inside the wall portion 51.

[0055] A circular opening 51a is formed on the wall portion 51, extending through the wall portion 51 in the thickness direction, connecting the outlet 42 of the electric oil pump 4 with the upstream end 24a of the oil passage 24. The opening portion 51a is configured such that its opening direction (in the figure, the axis X3 direction passing through the center of the opening portion 51a and orthogonal to the opening surface of the opening portion 51a) is orthogonal to the axis Y direction, which extends along the direction of the oil passage 24 within the control valve body 7.

[0056] like Figure 4 As shown, a cylindrical peripheral wall portion 54 is provided around the opening 51a at predetermined intervals, with an inner diameter D2 larger than the opening diameter D1 of the opening 51a. Inside the peripheral wall portion 54, a cylindrical gasket 55 and a sealing ring 56 are provided such that the opening 55a of the gasket 55 and the opening 56a of the sealing ring 56 are aligned with the opening direction of the opening 51a.

[0057] The sealing ring 56 is located on the electric oil pump 4 side of the gasket 55, sandwiched between the wall 43 surrounding the outlet 42 of the electric oil pump 4 and the gasket 55.

[0058] The opening diameter D3 of the gasket 55 opening 55a is smaller than the opening diameter D1 of the opening portion 51a and larger than the opening diameter Dx of the discharge port 42 of the electric oil pump 4. The opening diameter of the sealing ring 56 opening 56a is larger than the opening diameter Dx of the discharge port 42.

[0059] The outlet 42 of the electric oil pump 4, the opening 56a of the sealing ring 56 and the opening 55a of the gasket 55 are concentrically arranged on the extension line of the opening 51a (on the axis X3), so that the movement of the oil OL discharged from the electric oil pump 4 into the oil passage 24 is not hindered by the gasket 55 and the sealing ring 56.

[0060] The oil passage 24, located on the opposite side of the gasket 55 and separated from the opening 51a, serves as the location for the check valve 93.

[0061] The check valve 93 is a so-called baffle valve, consisting of a valve body 94 that can move forward and backward along the axis X3, and a spring Sp that applies force to the valve body 94 toward the opening 51a in the axis X3 direction.

[0062] The valve body 94 is made of aluminum alloy, for example, and is composed of an integrally formed circular plate-shaped valve portion 95 and a cylindrical shaft portion 96. The valve portion 95 is configured such that one end face 95a faces the opening portion 51a. The shaft portion 96 is located on the other end face 95b of the valve portion 95 and extends along the axis X3 direction.

[0063] On the wall portion 51, a receiving portion 513 for a check valve 93 is provided at a position opposite to the opening portion 51a. The receiving portion 513 opens into the connection portion of the oil passage 24 on the extension line (on the axis X3) of the opening portion 51a, and receives the check valve 93 that moves away from the opening portion 51a.

[0064] The receiving portion 513 is a space with an inner diameter slightly larger than the outer diameter D4 of the valve portion 95 of the valve body 94. At the center of the bottom 513a of the receiving portion 513, a support portion 53 of the valve body 94 is formed protruding toward the oil passage 24 (electric oil pump 4).

[0065] On the support portion 53, an opening is provided on the side of the oil passage 24 for inserting the shaft portion 96 of the check valve 93. The hole portion 530 extends in a straight line along the axis X3 in the support portion 53 toward the direction away from the oil passage 24.

[0066] One end of the hole 530 on the side of the opening 51a in the X3 direction is the opening end 530a. The other end of the hole 530 has a bottom 530b and is sealed.

[0067] The bore 530 extends beyond the inner diameter of the support 53 and reaches into the wall 51. The shaft 96 of the check valve 93 is inserted into the bore 530 from the opening end 530a.

[0068] like Figure 4 As shown, the portion of the support portion 53 surrounding the opening end 530a of the hole portion 530 becomes the valve seat portion 531. When the front end 96b of the shaft portion 96 moves to the bottom 530b and the entire length of the shaft portion 96 is housed inside the hole portion 530, the stepped portion 951 formed in the center of the valve portion 95 abuts against the valve seat portion 531 surrounding the opening end 530a of the hole portion 530.

[0069] A spring Sp is inserted and installed on the outer periphery of the support portion 53. One end of the spring Sp is positioned on the inner circumferential surface of the oil passage 24 along the axis X3, and the other end of the spring Sp abuts against the other end face 95b of the valve portion 95.

[0070] In the embodiment, when the valve portion 95 of the check valve 93 abuts against the end face 55b of the gasket 55, the spring Sp is compressed along the axis X3 direction.

[0071] Therefore, when the electric oil pump 4 stops, the valve part 95 is pressed against the end face 55b of the gasket 55 under the force of the spring Sp, and is kept in the position of closing the opening 51a.

[0072] Then, if the electric oil pump 4 operates in this state, the pushing force of the oil OL discharged from the electric oil pump 4 acts on the valve section 95. Therefore, if this pushing force is greater than the force of the spring Sp, the valve section 95 compresses the spring Sp in the direction of axis X3, and at the same time moves away from the gasket 55 (see reference). Figure 4 ).

[0073] As a result, the valve part 95 is pressed into the oil passage 24 until the stepped part 951 on the other end face 95b side abuts against the valve seat part 531, thereby opening the opening 51a that was closed by the valve part 95.

[0074] Thus, the outlet 42 of the electric oil pump 4 is connected to the oil passage 24 in the wall 51, so the oil OL discharged from the electric oil pump 4 is supplied to the oil passage 24 of the control valve body 7 through the upstream end 24a.

[0075] Thus, the check valve 93 installed in the oil circuit 24 corresponds to the operation and stop of the electric oil pump 4, switching the connection and disconnection between the oil circuit 24 and the discharge port 42 of the electric oil pump 4.

[0076] Figure 1 The check valve 92 shown, which is installed in the oil circuit 23 connecting the mechanical oil pump 3 and the pressure regulating circuit 70, can also be a baffle valve with the same structure as the check valve 93. Detailed description is omitted, but the check valve 92 corresponds to the operation and stop of the mechanical oil pump 3, switching the connection and disconnection between the oil circuit 23 and the discharge port 32 of the mechanical oil pump 3.

[0077] Figure 5 This is a diagram illustrating the specific structure of the check valve 91 installed in the oil circuit 22.

[0078] like Figure 5 As shown, the check valve 91 is located at the upstream end 22a (hereinafter referred to as "upstream end 22a") of the oil passage 22, which is connected to the connection port 83 of the filter 8 in the oil delivery direction.

[0079] An opening 22b communicating with a connection port 83 is provided on the upstream end 22a. The opening 22b is formed on a partition 78 disposed inside the control valve body 7. The connection port 83, which protrudes upward toward the filter 8, is embedded in the control valve body 7 and is opposite to the opening 22b disposed inside the control valve body 7.

[0080] The opening direction of the opening 22b is aligned with the opening direction of the connection port 83, i.e., the axis X direction. The opening 22b is located relative to the connection port 83 in the vertical VL direction (refer to...). Figure 2Above the oil level. Through the suction of the electric oil pump 4, the oil OL flows from bottom to top in the direction of gravity, and is introduced into the interior of the oil passage 22 through the connection port 83 and the opening 22b.

[0081] Check valve 91 is a baffle valve with the same structure as check valve 93, and has a valve body 94 consisting of a valve portion 95 and a shaft portion 96. The shaft portion 96 is slidably supported in a bore portion 22c, which is formed inside the control valve body 7 where the oil passage 22 is formed. The bore portion 22c is provided along the opening direction of the opening portion 22b, i.e., the axis X direction, and a support portion 22d is formed on the outer periphery of the bore portion 22c. A spring Sp that applies force to the valve portion 95 is inserted externally into the support portion 22d.

[0082] When the electric oil pump 4 is stopped, the valve part 95 is pressed against the opening 22b by the force of the spring Sp, closing the opening 22b. When the electric oil pump 4 is activated, the negative pressure generated by the oil OL drawn in by the electric oil pump 4 comes into effect. When this negative pressure is greater than the force of the spring Sp, the valve part 95 of the check valve 91 moves away from the opening 22b, and the opening 22b opens.

[0083] In this way, the check valve 91 opens and closes its opening 22b in response to the operation and stop of the electric oil pump 4, thereby switching the connection and disconnection between the oil circuit 22 and the connection port 83 of the filter 8.

[0084] Here, as Figure 1 As shown, since a high oil pressure, which becomes the initial pressure of the pipeline pressure, is applied to the check valves 92 and 93 located on the discharge ports 32 and 42 of the mechanical oil pump 3 and the electric oil pump 4, pressure resistance is required. As mentioned above, in order to improve pressure resistance, the check valves 92 and 93 can be made of, for example, an aluminum alloy valve body 94.

[0085] On the other hand, when the electric oil pump 4 operates, the pressure applied to the check valve 91 located on the suction port 41 side of the electric oil pump 4 is a negative pressure that is weaker than the initial pressure. Therefore, the required pressure resistance is lower compared to check valves 92 and 93, so for example, the valve body 94 of check valve 91 can be made of resin.

[0086] The operation of the check valves 91 and 93 when the electric oil pump 4 of the hydraulic supply device 2 in the embodiment is in operation and when it is stopped will be described below.

[0087] Figure 6 This diagram illustrates the operation of check valves 91 and 93 when the electric oil pump 4 is activated.

[0088] Here, we will explain the case where the electric oil pump 4 and the mechanical oil pump 3 operate in conjunction. Additionally, in Figures 6-8 The simplified diagram shows the structure surrounding check valve 93.

[0089] For example, in situations where downshifting of the belt-driven continuously variable transmission 1 requires high oil pressure, the electric oil pump 4 is activated to increase the oil pressure supplied by the mechanical oil pump 3.

[0090] If the electric oil pump 4 is activated by a control device (not shown) to begin the intake of oil OL, then as follows: Figure 6 As shown, the check valve 91 of oil passage 22 is displaced towards the open opening 22b due to negative pressure, thereby connecting oil passage 22 to the connection port 83 of filter 8. As a result, the oil OL in the oil storage section PL after being filtered by filter 8 flows in oil passage 22 and is drawn into the electric oil pump 4.

[0091] As the oil OL drawn in by the electric oil pump 4 is discharged from the outlet 42, the check valve 93 of the oil passage 24 is displaced towards the opening 51a by the oil pressure, which is the initial pressure of the pipeline pressure. Thus, the oil passage 24 is connected to the outlet 42 of the electric oil pump 4. The oil OL drawn in from the filter 8 flows through the oil passage 24. The initial pressure of the pipeline pressure generated by the suction of the electric oil pump 4 is supplied to the pressure regulating circuit 70 via the oil passage 24.

[0092] The initial pressure supplied by the electric oil pump 4 is regulated together with the initial pressure supplied by the mechanical oil pump 3 in the pressure regulating circuit 70 and supplied to the oil chambers R1 and R2.

[0093] Figure 7 This diagram illustrates the operation of check valves 91 and 93 when the electric oil pump 4 stops.

[0094] If the necessary amount of oil pressure is supplied to oil chambers R1 and R2, the control device (not shown) will stop the electric oil pump 4.

[0095] When the electric oil pump 4 is stopped, such as Figure 7 As shown, since no oil pressure is applied to the check valve 93 of the oil circuit 24, the spring Sp moves in the direction of closing the opening 51a, cutting off the connection between the oil circuit 24 and the discharge port 42 of the electric oil pump 4.

[0096] Similarly, since the negative pressure of the electric oil pump 4 will not act on the check valve 91 of the oil circuit 22, the spring Sp will displace the oil circuit 22 in the direction of closing the opening 22b, thus cutting off the connection between the oil circuit 22 and the filter 83.

[0097] Thus, in the implementation method, when the electric oil pump 4 stops, the upstream and downstream sides of the electric oil pump 4 are cut off by check valves 91 and 93, respectively.

[0098] The following describes the function of cases where either or both of check valves 91 and 93 are not installed, using Comparative Examples 1, 2, and 3 as examples. Furthermore, to distinguish them from the embodiments, in Comparative Examples 1, 2, and 3, oil passages 22 and 24 are replaced with oil passages 22A and 24A (see...). Figure 8 (This will be explained.)

[0099] • Comparative Example 1: Case where check valves 91 and 93 are not installed

[0100] If the electric oil pump 4 stops, oil OL flows backward from the mechanical oil pump 3 or the pressure regulating circuit 70 through oil line 24A to the electric oil pump 4. Due to this backward flow, the amount of oil OL supplied from the mechanical oil pump 3 to the pressure regulating circuit 70 decreases. As a result, it is necessary to increase the discharge rate of the mechanical oil pump 3, which affects the vehicle's fuel consumption rate.

[0101] Comparative Example 2: Case where check valve 91 is not installed

[0102] Figure 8 This is a diagram representing comparison example 2.

[0103] Unlike Comparative Example 1, the presence of a check valve 93 in oil circuit 24A prevents backflow from the mechanical oil pump 3 to the electric oil pump 4. On the other hand, in oil circuit 22A, when the electric oil pump 4 stops pumping oil OL, air enters oil circuit 22A through gaps between components such as the suction port 41 of the electric oil pump 4. Additionally, air accumulated in the filter 8 may sometimes enter the interior of oil circuit 22A.

[0104] Thus, because air enters the oil circuit 22A which is not equipped with a check valve 91, oil OL leaks out from the oil circuit 22A.

[0105] If the electric oil pump 4 is activated while oil OL is leaking from oil circuit 22A, the electric oil pump 4 will first draw in the air entering oil circuit 22A and run idle, which may result in a delay in the time when oil OL begins to be discharged.

[0106] Comparative Example 3: Case where check valve 93 is not installed

[0107] By installing a check valve 91 on oil circuit 22A, oil leakage from oil circuit 22A can be prevented. However, as mentioned above, oil OL flows backward from mechanical oil pump 3 or pressure regulating circuit 70 to electric oil pump 4 via oil circuit 24A, which is not equipped with a check valve 93. The check valve 91 is usually activated by the negative pressure generated by the suction of electric oil pump 4 and does not require pressure resistance. However, if high pressure is applied to valve body 94 due to the backflow of oil OL, there is a possibility that the product life of check valve 91 will be reduced.

[0108] As mentioned above, when downshifting requires high oil pressure and both electric oil pump 4 and mechanical oil pump 3 are used together, it is required to quickly supply oil pressure to oil chambers R1 and R2.

[0109] Therefore, as Figure 7 As shown, in this embodiment, by providing a check valve 91 on the oil passage 22, when the electric oil pump 4 stops, the amount of air entering the interior of the oil passage 22 through gaps in components such as the suction port 41 is reduced. This prevents oil OL from leaking out of the oil passage 22.

[0110] like Figure 6 As shown, when the electric oil pump 4 is activated with oil OL present in the oil circuit 22, the idling caused by the intake of air is reduced. As a result, the electric oil pump 4 draws in the oil OL of the oil circuit 22 before the check valve 91 of the oil circuit 22 is opened and begins to discharge it, thus rapidly supplying oil pressure to the oil chambers R1 and R2.

[0111] Furthermore, such as Figure 2 As shown, the electric oil pump 4 draws in oil OL stored in the oil reservoir PL. However, after being agitated by the rotation of the components of the belt-driven continuously variable transmission 1, the oil OL in the oil reservoir PL falls along the wall of the transmission 5 into the interior of the oil pan 6. Therefore, the oil OL in the oil reservoir PL contains a large number of air particles K. The oil OL containing air particles K is drawn into the filter 8. Due to buoyancy, the air particles K move upward in the vertical direction VL inside the filter 8, forming an air reservoir Air.

[0112] As described above, the front end of the filter 8 equipped with the electric oil pump 4 is positioned above the rear end of the filter 8 equipped with the mechanical oil pump 3 in the vertical direction (VL). Therefore, an air accumulation section (Air) is easily formed on the front end of the filter 8 equipped with the electric oil pump 4.

[0113] As explained in Comparative Example 3, when no check valve 91 is installed in the oil circuit 22, when the electric oil pump 4 stops, the air in the air reservoir Air formed on the front end side of the filter 8 may be drawn through the connection port 83 (see Comparative Example 3) due to the mechanical oil pump 3 drawing oil OL. Figure 1 The air enters the oil circuit 22. As a result, when the electric oil pump 4 is activated, a large amount of air will be drawn in, which may cause a delay in the discharge time.

[0114] In this embodiment, when the electric oil pump 4 stops, the check valve 91 cuts off the connection between the oil passage 22 and the connection port 83 of the filter 8. Thus, when the electric oil pump 4 stops, it can prevent the air accumulated on the front end of the filter 8 from entering the oil passage 22 through the connection port 83, thereby preventing oil OL from leaking out of the oil passage 22.

[0115] In addition, when the electric oil pump 4 is activated, it draws in the oil OL inside the oil passage 22 and begins to discharge it. Therefore, after the check valve 91 is retracted to connect the oil passage 22 to the connection port 83, even if the air in the air storage section Air is drawn in, it is difficult to cause a delay in the discharge of the electric oil pump 4.

[0116] Furthermore, in this embodiment, by also providing a check valve 93 in the oil circuit 24, when the electric oil pump 4 is stopped, it is possible to prevent oil OL from flowing back from the mechanical oil pump 3 or the pressure regulating circuit 70 to the electric oil pump 4. This prevents a decrease in the supply of oil OL from the mechanical oil pump 3 to the pressure regulating circuit 70, and further prevents the backflowing oil OL from exerting high pressure on the check valve 91 of the oil circuit 22.

[0117] As described above, the hydraulic supply device 2 of the embodiment has the following characteristics:

[0118] (1) Possesses:

[0119] Mechanical oil pump 3 (first oil pump) is operated by a drive source for the vehicle's movement;

[0120] Electric oil pump 4 (second oil pump) operates by an electric motor that is different from the driving source for driving, and switches between operation and stop according to the driving conditions of the vehicle;

[0121] The pressure regulating circuit 70 regulates the oil pressure generated by the mechanical oil pump 3 and the electric oil pump 4 and supplies it to the oil chambers R1 and R2.

[0122] Oil circuit 22 connects electric oil pump 4 to oil storage unit PL (oil source);

[0123] Check valve 91 is installed in oil circuit 22.

[0124] When the electric oil pump 4 stops, air enters the oil passage 22 through gaps between components, and sometimes oil OL leaks out from the oil passage 22 connecting the oil reservoir PL and the electric oil pump 4 due to air. If oil OL leaks out from the oil passage 22, the electric oil pump 4 will idle until the air is expelled when it is restarted, which may delay the discharge of oil OL.

[0125] When the mechanical oil pump 3 stops, such as at idle stop, and the electric oil pump 4 is used, a slight delay in operation is not a problem. On the other hand, when the continuously variable transmission (CVT) requires high oil pressure, such as downshifting, and the electric oil pump 4 is used as an auxiliary to the mechanical oil pump 3, rapid operation is required.

[0126] In the implementation, by providing a check valve 91 on the oil circuit 22, it is possible to prevent air from entering when the electric oil pump 4 stops, thus preventing oil OL from leaking out of the oil circuit 22 and improving the responsiveness of the electric oil pump 4.

[0127] (2) Check valve 91 is installed in the part of oil circuit 22 where oil OL drawn by electric oil pump 4 flows from bottom to top in the direction of gravity.

[0128] A check valve 91 is installed on the upstream end 22a of the oil passage 22, which connects to the connection port 83 of the filter 8, and opens and closes the opening 22b. When the electric oil pump 4 is operating, oil OL flows upwards in the opening 22b due to gravity. Therefore, when the electric oil pump 4 stops, oil OL flows backwards to the downstream side under the influence of gravity, and oil OL is prone to leak from the oil passage 22. Thus, by providing a check valve 91 to open and close the opening 22b, backflow can be prevented, and oil leakage from the oil passage 22 can be appropriately prevented.

[0129] (3) The electric oil pump 4 is installed in the air, and the check valve 91 is installed in the oil storage section PL, which serves as the oil source.

[0130] When the direction of oil passage 22 from the oil reservoir PL towards the electric oil pump 4 is taken as the oil delivery direction, the downstream side of the check valve 91 in the oil delivery direction is closed by the check valve 91, so oil OL will not leak out, and even if the electric oil pump 4 is placed in the air, air intake can be prevented. In addition, since the check valve 91 itself is placed in the oil, air intake in the upstream side of the check valve 91 in the oil delivery direction can also be prevented.

[0131] (4) A filter 8 for filtering oil OL is installed in the oil storage section PL.

[0132] Mechanical oil pump 3 and electric oil pump 4 draw oil OL from oil storage section PL via filter 8.

[0133] Filter 8 has the following features:

[0134] Connection port 82 (first connection port) supplies oil OL to mechanical oil pump 3;

[0135] Connection port 83 (second connection port) is located above connection port 82 in the direction of gravity and is connected to oil passage 22.

[0136] When the electric oil pump 4 stops, the check valve 91 cuts off the connection between the oil circuit 22 and the connection port 83.

[0137] Mechanical oil pump 3 and electric oil pump 4 draw oil OL from a common filter 8. The connection port 83 connected to the electric oil pump 4 is located above the connection port 82 connected to the mechanical oil pump 3.

[0138] The oil OL stored in the oil reservoir PL may sometimes contain air due to agitation by the rotating parts of the vehicle. If the oil OL containing this air is drawn into the interior of the filter 8, the air moves upward in the direction of gravity and easily forms an air reservoir near the connection port 83.

[0139] By using check valve 91, the connection with connection port 83 is cut off when electric oil pump 4 stops, thereby preventing air from the air reservoir from entering oil passage 22 through connection port 83. As a result, when electric oil pump 4 is restarted, the discharge delay caused by air intake in oil passage 22 can be reduced.

[0140] (5) Check valve 91 is a baffle valve.

[0141] The baffle valve has a valve body 94, which is configured to move forward and backward relative to the opening direction (axis X direction) of the opening 22b of the oil passage 22 communicating with the connection port 83, and to open and close the opening 22b.

[0142] By making the check valve 91 a baffle valve, for example compared to a ball valve, the flow rate of oil OL can be increased when oil passage 22 is open.

[0143] The embodiments of the present invention have been described above. However, the above embodiments are merely one example of the application of the present invention and are not intended to limit the technical scope of the present invention to the specific structure of the above embodiments.

[0144] In the implementation method, such as Figure 2 The illustration shows an example of a gearbox 5 being tilted due to layout constraints, but it is not limited to this. For example, if the layout is more flexible, the gearbox 5, oil pan 6, and filter 8 can be arranged horizontally without tilting, so that the suction port 41 of the electric oil pump 4 is located in the liquid in the oil reservoir PL.

[0145] This invention claims priority based on Japanese Patent Application No. 2019-238014 filed with the Japanese Patent Office on December 27, 2019, the entire contents of which are incorporated herein by reference.

Claims

1. An oil pressure supply device, comprising: a check valve that prevents flow of oil from an oil passage to an oil source; a filter; a first oil pump that operates by a driving source for traveling of a vehicle; a second oil pump that operates by an electric motor different from the driving source for traveling, and that switches operation and stop according to a traveling condition of the vehicle; a pressure regulating circuit that regulates oil pressure generated by the first oil pump and the second oil pump, and supplies to an oil chamber; the oil passage that connects the second oil pump and the oil source, a first connection port of the filter is connected to the first oil pump, a second connection port of the filter is connected to the second oil pump via the check valve, the second connection port is located above the first connection port in a gravitational direction, the first connection port is disposed in an oil accumulation portion, no check valve is provided between the first oil pump and the first connection port of the filter, the second oil pump is disposed in air, the check valve tilts the filter in a manner of being disposed in the oil accumulation portion as the oil source, and when the second oil pump is stopped, the oil passage is cut off from the second connection port, and leakage of the oil from the oil passage is suppressed.

2. An oil pressure supply device, comprising: a check valve that prevents flow of oil from an oil passage to an oil source; a filter; a first oil pump that operates by a driving source for traveling of a vehicle; a second oil pump that operates by an electric motor different from the driving source for traveling, and that switches operation and stop according to a traveling condition of the vehicle; a pressure regulating circuit that regulates oil pressure generated by the first oil pump and the second oil pump, and supplies to an oil chamber; the oil passage that connects the second oil pump and the oil source, a first connection port of the filter is connected to the first oil pump, a second connection port of the filter is connected to the second oil pump via the check valve, an upper portion of the filter is configured to be tilted toward above in the gravitational direction from the first connection port toward the second connection port, the first connection port is disposed in an oil accumulation portion, no check valve is provided between the first oil pump and the first connection port of the filter, the second oil pump is disposed in air, the check valve tilts the filter in a manner of being disposed in the oil accumulation portion as the oil source, and when the second oil pump is stopped, the oil passage is cut off from the second connection port, and leakage of the oil from the oil passage is suppressed.

3. The oil pressure supply device according to claim 1 or 2, wherein the check valve is provided at a portion where oil suctioned by the second oil pump flows from below to above in the gravitational direction.

4. The oil pressure supply device according to claim 1 or 2, wherein the check valve has a plate-shaped valve portion, and a spring that applies force to the plate-shaped valve portion toward the second connection port of the filter.

5. The oil pressure supply device according to claim 1 or 2, wherein oil pressure is supplied from the first oil pump and / or the second oil pump to a continuously variable transmission, and both the first oil pump and the second oil pump are caused to operate when downshifting of the continuously variable transmission is performed. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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