JP4997820B2 - Driving device for belt type continuously variable transmission - Google Patents

Description

  The present invention relates to a drive device for a belt-type continuously variable transmission that changes a gear ratio by changing a belt diameter of a primary pulley and a secondary pulley, and in particular, hydraulic oil is supplied between a primary pulley and a secondary pulley. The present invention relates to a drive device for a belt-type continuously variable transmission including a speed change pump capable of changing a speed ratio by being moved.

  Related arts of this type of belt-type continuously variable transmission driving device are disclosed in Patent Documents 1 and 2 below. In Patent Document 1, hydraulic oil is moved between a primary pulley and a secondary pulley by a transmission hydraulic pump driven by an electric motor to change the transmission ratio. In addition, the hydraulic oil discharged from the main pressure hydraulic pump driven by the engine is supplied to the lubrication system and the clutch of the forward / reverse switching device. Further, the belt clamping pressure is applied by supplying the hydraulic oil discharged from the main pressure hydraulic pump to the primary pulley or the secondary pulley via the spool type switching valve. The spool of the switching valve here communicates the pulley having the smaller hydraulic oil pressure between the primary pulley and the secondary pulley with the discharge side of the source pressure hydraulic pump. In this way, the switching operation of the switching valve is performed so that the hydraulic oil discharged from the original pressure hydraulic pump is supplied to the pulley with the lower pressure, thereby suppressing a decrease in the belt clamping pressure.

  Also in Patent Document 2, the hydraulic oil driven by an electric motor moves the hydraulic oil between the primary pulley and the secondary pulley to change the gear ratio, and the operation is discharged by the main pressure hydraulic pump driven by the engine. Oil is supplied to the lubrication system and the clutch of the forward / reverse switching device. Then, the hydraulic oil discharged from the main pressure hydraulic pump is supplied to the primary pulley and the secondary pulley through the check valve. One port of the transmission hydraulic pump is selectively connected to a primary pulley or a reservoir by an electromagnetic switching valve. The other port of the transmission hydraulic pump is connected to the secondary pulley and can be connected to the discharge side of the original pressure hydraulic pump via a pressure-sensitive valve or an electromagnetic on-off valve.

  In Patent Document 2, when the engine is rotationally driven and the transmission gear ratio is changed by the transmission hydraulic pump, one port of the transmission hydraulic pump is connected to the primary pulley by the electromagnetic switching valve. In this case, the pressure-sensitive valve or the electromagnetic on-off valve is closed, and the hydraulic oil discharged from the main pressure hydraulic pump is supplied to the lubrication system and the clutch of the forward / reverse switching device. On the other hand, when stopping the engine operation and stopping the rotational drive of the main pressure hydraulic pump, one port of the transmission hydraulic pump is connected to the reservoir by an electromagnetic switching valve. In this case, the pressure-sensitive valve or the electromagnetic on-off valve opens, and the hydraulic oil discharged from the other port of the speed-change hydraulic pump is rotated and driven by rotating the speed-change hydraulic pump. Supplied to the clutch of the forward / reverse switching device. Further, in this case, the gear ratio is fixed by the oil passage on the primary pulley side being disconnected from one port of the hydraulic pump for shifting and closed by the electromagnetic switching valve. As described above, in Patent Document 2, even when the engine operation is stopped and the rotation driving of the main pressure hydraulic pump is stopped, hydraulic oil can be supplied to a hydraulic load such as a lubrication system or a clutch of a forward / reverse switching device. Yes.

  In addition, a drive device for a belt-type continuously variable transmission according to Patent Document 3 below is disclosed.

JP 2005-226730 A JP 2005-30495 A JP 2006-57757 A

  In Patent Document 1, when the operation of the engine is stopped and the rotational driving of the main pressure hydraulic pump is stopped, the supply of the belt clamping pressure to the primary pulley or the secondary pulley is stopped, and the lubrication system and the forward / reverse switching device The supply of hydraulic oil to the hydraulic load such as the clutch is also stopped. As described above, there is a problem in that the hydraulic oil cannot be supplied to the hydraulic load when the main pressure hydraulic pump is stopped.

  In Patent Document 2, even when the main pressure hydraulic pump is stopped, the shift hydraulic pump is driven to rotate by connecting one port of the shift hydraulic pump to the reservoir by an electromagnetic switching valve to rotate the shift hydraulic pump. The hydraulic oil can be supplied from the other port of the pump to a hydraulic load such as a lubrication system or a clutch of a forward / reverse switching device. However, when one port of the transmission hydraulic pump is connected to the reservoir by the electromagnetic switching valve, the gear ratio is fixed by disconnecting and closing the oil path on the primary pulley side from one port of the transmission hydraulic pump. Is done. Therefore, there is a problem that hydraulic oil cannot be supplied to the hydraulic load while adjusting the gear ratio.

  The present invention uses a transmission pump capable of changing a transmission gear ratio by moving hydraulic oil between a primary pulley and a secondary pulley, and adjusts the transmission gear ratio while adjusting the transmission gear ratio. An object of the present invention is to provide a belt type continuously variable transmission drive device capable of supplying

  The belt type continuously variable transmission driving apparatus according to the present invention employs the following means in order to achieve the above-described object.

A belt type continuously variable transmission driving device according to the present invention is a belt type continuously variable transmission driving device that changes a gear ratio by changing a belt engagement diameter of a primary pulley and a secondary pulley. A transmission pump having a first port communicating with the pulley and a second port communicating with the secondary pulley and capable of changing a gear ratio by moving hydraulic oil between the primary pulley and the secondary pulley; A first state having a suction side port and a discharge side port, wherein the first port and the primary pulley are communicated with the suction side port, and the second port and the secondary pulley are communicated with the discharge side port; Second state in which the pulley communicates with the suction side port and the first port and the primary pulley communicate with the discharge side port And a switching means capable of selectively switching to a suction side oil passage for connecting a reservoir in which hydraulic oil is stored to a suction side port via a suction side check means, the suction side check A means for permitting the flow of hydraulic oil from the reservoir to the suction side port and connecting the suction side oil passage, which is a means for blocking the flow of hydraulic oil from the suction side port to the reservoir, and the discharge side port to a hydraulic load; The discharge side oil passage and the original pressure pump capable of sucking and discharging the hydraulic oil stored in the reservoir, wherein the discharged hydraulic oil can be supplied to the intake side port and the hydraulic load And a main pressure side check means that allows the flow of hydraulic oil from the main pressure pump to the hydraulic load and blocks the flow of hydraulic oil from the hydraulic load to the main pressure pump, and from the discharge side oil passage to the suction side oil passage Blocks the flow of hydraulic fluid Comprising a shut-off means capable Rukoto, and the discharge-side oil passage interrupts the flow of hydraulic fluid to the discharge side port from the hydraulic load as well as allows the flow of hydraulic fluid to the hydraulic load from the discharge side port An opening / closing means for opening / closing the discharge side check means or the communication between the discharge side port and the hydraulic load is provided, and when the hydraulic oil is supplied to the hydraulic load when the main pressure pump is stopped, the shift pump is connected to the reservoir. the reservoir has been working oil sucked through the suction-side oil passage, and the gist and Turkey be supplied to through the discharge-side oil passage by discharging hydraulic oil the suction hydraulic load.

  In one aspect of the present invention, the switching means switches to the first state when the pressure of the hydraulic oil of the secondary pulley is higher than the pressure of the hydraulic oil of the primary pulley, and the pressure of the hydraulic oil of the primary pulley operates the secondary pulley. It is preferable to switch to the second state when the pressure is higher than the oil pressure.

  In one aspect of the present invention, it is preferable to include pressure adjusting means for adjusting the pressure of the hydraulic oil supplied to the suction side port.

The belt-type continuously variable transmission driving apparatus according to the present invention is a belt-type continuously variable transmission driving apparatus that changes a gear ratio by changing a belt engagement diameter to a primary pulley and a secondary pulley. And a first port that communicates with the primary pulley and a second port that communicates with the secondary pulley, and the gear ratio can be changed by moving hydraulic oil between the primary pulley and the secondary pulley. A suction side oil passage for connecting a pump and a reservoir storing hydraulic oil to a first port and a primary pulley via suction side check means, wherein the suction side check means is connected to the first port from the reservoir Suction, which is a means for allowing the flow of hydraulic oil to the primary pulley and blocking the flow of hydraulic oil from the first port and the primary pulley to the reservoir An oil passage, a second port and a discharge side oil for connecting the secondary pulley hydraulic load path, a source pressure pump capable of suctions and discharges reservoir by the hydraulic pump to the reservoir, leaving said discharge Hydraulic fluid that can be supplied to either the primary pulley or the secondary pulley and the hydraulic load, and allows the hydraulic fluid to flow from the primary pressure pump to the hydraulic load and from the hydraulic load to the primary pressure pump. A pressure-side non-return means for interrupting the flow of the hydraulic oil, and the discharge-side oil passage allows the hydraulic oil to flow from the second port and the secondary pulley to the hydraulic load and from the hydraulic load to the second port. and the discharge side check means are provided to block the flow of hydraulic fluid to the secondary pulley, when the working oil is supplied to the hydraulic load in the stop state of the original pressure pump, gear pump, the reservoir The hydraulic oil reserved in bar sucked through the suction-side oil passage, and the gist and Turkey be supplied to through the discharge-side oil passage by discharging hydraulic oil the suction hydraulic load.

The belt-type continuously variable transmission driving apparatus according to the present invention is a belt-type continuously variable transmission driving apparatus that changes a gear ratio by changing a belt engagement diameter to a primary pulley and a secondary pulley. And a first port that communicates with the primary pulley and a second port that communicates with the secondary pulley, and the gear ratio can be changed by moving hydraulic oil between the primary pulley and the secondary pulley. A suction side oil passage for connecting a pump and a reservoir storing hydraulic oil to a second port and a secondary pulley via suction side check means, wherein the suction side check means is connected to the second port from the reservoir and Suction is a means for allowing the flow of hydraulic oil to the secondary pulley and blocking the flow of hydraulic oil from the second port and the secondary pulley to the reservoir An oil passage, and a discharge-side oil passage for connecting the first port and the primary pulley to the hydraulic load, a source pressure pump capable of suctions and discharges reservoir by the hydraulic pump to the reservoir, leaving said discharge Hydraulic fluid that can be supplied to either the primary pulley or the secondary pulley and the hydraulic load, and allows the hydraulic fluid to flow from the primary pressure pump to the hydraulic load and from the hydraulic load to the primary pressure pump. A pressure-side non-return means for blocking the flow of the hydraulic oil, and the discharge-side oil passage allows the flow of hydraulic oil from the first port and the primary pulley to the hydraulic load and from the hydraulic load to the first port. and the discharge side check means are provided to block the flow of hydraulic fluid to the primary pulley, in the case where the working oil is supplied to the hydraulic load in the stop state of the original pressure pump, gear pump, the reservoir The hydraulic oil reserved in bar sucked through the suction-side oil passage, and the gist and Turkey be supplied to through the discharge-side oil passage by discharging hydraulic oil the suction hydraulic load.

  According to the present invention, the transmission pump capable of changing the transmission gear ratio by moving the hydraulic oil between the primary pulley and the secondary pulley is stored in the reservoir while being in communication with the primary pulley and the secondary pulley. The discharged hydraulic oil can be sucked in through the suction side oil passage, and the sucked hydraulic oil can be discharged and supplied to the hydraulic load through the discharge side oil passage. Therefore, the hydraulic oil can be supplied to the hydraulic load while adjusting the speed ratio using the speed change pump.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a drive device for a belt-type continuously variable transmission according to an embodiment of the present invention. The belt-type continuously variable transmission 14 has a substantially V-shaped cross section wound around a primary pulley 30 connected to an input shaft 26, a secondary pulley 32 connected to an output shaft 36, and the primary pulley 30 and the secondary pulley 32. The endless belt 34 is provided. The input shaft 26 (primary pulley 30) is transmitted with power generated by one or more of the engine 10 and a motor (not shown) via a torque converter and a forward / reverse switching device (both not shown). . The belt type continuously variable transmission 14 shifts the power transmitted to the input shaft 26 and transmits it to the output shaft 36. The power transmitted to the output shaft 36 is output to a load (not shown) connected to the output shaft 36, and used for driving a load such as driving a vehicle. Thus, the vehicle can be driven using the power generated by one or more of the engine 10 and the motor.

  The primary pulley 30 includes a primary movable sheave 30a that can move in the direction of the input shaft 26 and a primary fixed sheave 30b. Similarly, the secondary pulley 32 includes a secondary movable sheave 32a that can move in the direction of the output shaft 36 and a secondary fixed sheave 32b. A thrust in the direction of the input shaft 26 acts on the primary movable sheave 30a by the pressure Pp of the hydraulic oil supplied to the primary pulley oil chamber 30c. Similarly, the thrust in the direction of the output shaft 36 acts on the secondary movable sheave 32a by the pressure Ps of the hydraulic oil supplied to the secondary pulley oil chamber 32c. When the primary movable sheave 30a and the secondary movable sheave 32a move in the axial direction, the rotation radius (hanging diameter) of the portion where the endless belt 34 is wound around the primary pulley 30 and the secondary pulley 32 changes. As a result, the gear ratio γ (= the rotational speed Nin of the primary pulley 30 / the rotational speed Nout of the secondary pulley 32) of the belt-type continuously variable transmission 14 continuously changes.

  In the belt type continuously variable transmission 14 of the present embodiment, the pressure receiving area A1 in which the primary movable sheave 30a receives the hydraulic pressure Pp supplied to the primary pulley oil chamber 30c in the direction of the input shaft 26 (thrust generation direction) is secondary. The movable sheave 32a is designed to be equal to the pressure receiving area A2 that receives the hydraulic pressure Ps supplied to the secondary pulley oil chamber 32c in the direction of the output shaft 36 (thrust generation direction).

  The hydraulic pressure supplied to the primary pulley oil chamber 30c and the secondary pulley oil chamber 32c of the belt type continuously variable transmission 14 is supplied by the hydraulic control device 40, and these hydraulic pressures are controlled by the electronic control device 42.

  Next, the main configuration of the hydraulic control device 40 will be described. The reservoir 52 stores hydraulic oil. The original pressure hydraulic pump 54 is driven to rotate by using, for example, power generated by the engine 10, sucks the hydraulic oil stored in the reservoir 52, and discharges it from the discharge port 54 a. The discharge port 54a of the main pressure hydraulic pump 54 is provided with hydraulic oil such as a clutch C1, a torque converter, and a lubrication system of a forward / reverse switching device via a check valve (original pressure side check valve) 55 and a line pressure supply oil passage 57. Is connected to the hydraulic load where the energy is utilized. Here, the check valve 55 allows the flow of hydraulic oil from the discharge port 54a of the source pressure hydraulic pump 54 to the line pressure supply oil passage 57 (hydraulic load such as the clutch C1 and the lubrication system) and supplies the line pressure. The flow of hydraulic oil from the oil passage 57 (hydraulic load) to the discharge port 54a is blocked. The hydraulic oil discharged from the discharge port 54a of the source pressure hydraulic pump 54 is supplied to either the primary pulley oil chamber 30c or the secondary pulley oil chamber 32c via the pinching pressure supply oil passage 66, and the forward / reverse switching is performed. It is also supplied to hydraulic loads such as the clutch C1, torque converter, and lubrication system of the device, and is also used for supply hydraulic pressure to the clutch C1 of the forward / reverse switching device, power transmission in the torque converter, lubrication in the lubrication system, and the like.

  The regulator 56 is provided between the discharge port 54a (the check valve 55) of the source pressure hydraulic pump 54 and the clamping pressure supply oil passage 66, and the hydraulic oil pressure (clutch C1 and The line pressure PL, which is the pressure of hydraulic oil supplied to a hydraulic load such as a lubrication system, is adjusted so as to become the set pressure PL0. When the line pressure PL is higher than the set pressure PL0, the regulator 56 is opened, so that the hydraulic oil discharged from the main pressure hydraulic pump 54 flows into the sandwiching pressure supply oil passage 66 and is reduced. On the other hand, when the line pressure PL is equal to or lower than the set pressure PL0, the regulator 56 is closed, so that the flow of hydraulic oil from the line pressure supply oil passage 57 to the nipping pressure supply oil passage 66 is blocked.

  The regulator 58 is provided between the clamping pressure supply oil passage 66 and the reservoir 52, and the hydraulic oil pressure in the clamping pressure supply oil passage 66 (the hydraulic oil supplied to the primary pulley oil chamber 30c or the secondary pulley oil chamber 32c). Pressure) Pd is adjusted so as to be the set pressure Pd0 (Pd0 ≦ PL0). When the pressure Pd in the nipping pressure supply oil passage 66 is higher than the set pressure Pd0, the regulator 58 is opened, so that the hydraulic oil in the nipping pressure supply oil passage 66 is drained to the reservoir 52 and depressurized. On the other hand, when the pressure Pd of the clamping pressure supply oil passage 66 is equal to or lower than the set pressure Pd0, the regulator 58 is closed, and the flow (drain) of hydraulic oil from the clamping pressure supply oil passage 66 to the reservoir 52 is blocked.

  The transmission hydraulic pump 60 has a first port 60p communicating with the primary pulley oil chamber 30c and a second port 60s communicating with the secondary pulley oil chamber 32c. The shift hydraulic pump 60 here is an electric pump and is rotationally driven by a shift electric motor 62. The speed ratio γ of the belt type continuously variable transmission 14 can be changed by rotationally driving the speed change hydraulic pump 60 by the speed change electric motor 62. That is, the transmission hydraulic pump 60 draws the hydraulic oil in the primary pulley oil chamber 30c from the first port 60p, discharges the drawn hydraulic oil from the second port 60s, and supplies it to the secondary pulley oil chamber 32c. The hydraulic oil in the primary pulley oil chamber 30c can be moved to the secondary pulley oil chamber 32c. As a result, a deceleration operation (downshift) can be performed. Further, the transmission hydraulic pump 60 sucks the hydraulic oil in the secondary pulley oil chamber 32c from the second port 60s, discharges the sucked hydraulic oil from the first port 60p, and supplies it to the primary pulley oil chamber 30c. The hydraulic oil in the secondary pulley oil chamber 32c can be moved to the primary pulley oil chamber 30c. As a result, a speed-up operation (upshift) can be performed. As described above, the transmission hydraulic pump 60 of the present embodiment is a reversible pump, and hydraulic oil can be reversibly moved between the primary pulley oil chamber 30c and the secondary pulley oil chamber 32c by the transmission hydraulic pump 60. it can. Further, since the speed change operation can be performed without draining the hydraulic oil in the pulley oil chambers 30c and 32c to the reservoir 52, the drive efficiency of the hydraulic control device 40 can be improved.

  The switching valve (pulley side switching valve) 64 includes a primary side port 64p communicating with the primary pulley oil chamber 30c and the first port 60p of the transmission hydraulic pump 60, and a secondary pulley oil chamber 32c and the second of the transmission hydraulic pump 60. A secondary side port 64s that communicates with the port 60s, a suction side port 64a that communicates with the clamping pressure supply oil passage 66, and a discharge side port 64b, and a spool that switches the communication state between the ports by sliding in the axial direction ( (Not shown). The switching valve 64 allows the primary side port 64p (primary pulley oil chamber 30c and first port 60p) to communicate with the suction side port 64a (clamping pressure supply oil passage 66) and the secondary side port 64s (secondary pulley oil chamber 32c and first pulley 60c). 2 port 60s) is connected to the discharge side port 64b, and the secondary side port 64s is connected to the suction side port 64a and the primary side port 64p is connected to the discharge side port 64b. It is possible to selectively switch to the second state (the state on the left side in FIG. 1). The switching valve 64 here can be comprised by a pilot pressure switching valve, for example. Then, the hydraulic oil pressure Pp in the primary pulley oil chamber 30c and the hydraulic oil pressure Ps in the secondary pulley oil chamber 32c are respectively supplied to both ends of the spool as pilot pressure. Here, the pressure receiving area S1 where one end of the spool receives the pressure Pp in the axial direction is designed to be equal to the pressure receiving area S2 where the other end of the spool receives the pressure Ps in the axial direction. Thereby, S1 / S2 is designed to be equal to A1 / A2.

  When Ps.times.S2> Pp.times.S1, that is, Ps.times.A2> Pp.times.A1 (in this embodiment, A1 = A2 and S1 = S2, Ps> Pp), the switching valve 64 is in the first state described above. Switch to On the other hand, when Pp × S1> Ps × S2, that is, Pp × A1> Ps × A2 (in this embodiment, P1> Ps because A1 = A2 and S1 = S2), the switching valve 64 is the first Switch to 2 state. Further, when Ps × S2 = Pp × S1, that is, Ps × A2 = Pp × A1 (in this embodiment, A1 = A2 and S1 = S2, Ps = Pp), and the spool is in the neutral position, the spool Accordingly, the communication between the primary side port 64p and the secondary side port 64s and the suction side port 64a and the discharge side port 64b is blocked (the state in the center of FIG. 1).

  As described above, the switching valve 64 causes the pulley oil chamber, of the primary pulley oil chamber 30c and the secondary pulley oil chamber 32c, having the smaller pressure of the supplied hydraulic oil to communicate with the pinching pressure supply oil passage 66. As a result, the hydraulic oil pressure Pd from the clamping pressure supply oil passage 66 can be supplied to the pulley oil chamber whose pulley thrust (belt clamping pressure) is judged to be small, so that the belt-type continuously variable transmission 14 The necessary pulley thrust (belt clamping pressure) can be stably secured according to the driving state. Therefore, the slip of the endless belt 34 can be reliably suppressed. Here, the pulley thrust (belt clamping pressure) can be adjusted by adjusting the pressure Pd of the hydraulic oil in the clamping pressure supply oil passage 66 by the regulator 58.

  A bypass oil passage 74 for connecting the clamping pressure supply oil passage 66 and the secondary pulley oil chamber 32c is provided to bypass the switching valve 64. The bypass oil passage 74 includes a check valve 72 and a throttle (orifice) 80. Is provided. The check valve 72 allows the flow of hydraulic oil from the clamping pressure supply oil passage 66 to the secondary pulley oil chamber 32c and blocks the flow of hydraulic oil from the secondary pulley oil chamber 32c to the clamping pressure supply oil passage 66. . As described above, when the spool of the switching valve 64 is in the neutral position, communication between the primary pulley oil chamber 30c and the secondary pulley oil chamber 32c and the clamping pressure supply oil passage 66 is blocked by the spool. However, since the hydraulic oil can be supplied from the clamping pressure supply oil passage 66 to the secondary pulley oil chamber 32c via the check valve 72 (bypass oil passage 74), the pressure Ps of the secondary pulley oil chamber 32c can be increased. The switching valve 64 can be switched to the first state described above. At this time, the hydraulic oil is supplied from the clamping pressure supply oil passage 66 to the secondary pulley oil chamber 32c via the throttle (orifice) 80, thereby suppressing a sudden change in the pressure Ps of the secondary pulley oil chamber 32c.

  In the present embodiment, a suction-side oil passage 67 is provided for connecting the reservoir 52 to a suction-side port 64a (clamping pressure supply oil passage 66) of the switching valve 64 via a check valve (suction-side check valve) 65. It has been. Here, the check valve 65 allows the flow of hydraulic oil from the reservoir 52 to the suction side port 64a (clamping pressure supply oil passage 66) and blocks the flow of hydraulic oil from the suction side port 64a to the reservoir 52. To do. Further, a discharge-side oil passage 68 for connecting the discharge-side port 64b of the switching valve 64 to the line pressure supply oil passage 57 (hydraulic load such as the clutch C1 and the lubrication system) is provided. In the discharge side oil passage 68, the flow of hydraulic oil from the discharge side port 64b to the line pressure supply oil passage 57 (hydraulic load) is allowed and from the line pressure supply oil passage 57 (hydraulic load) to the discharge side port 64b. A check valve (discharge-side check valve) 70 for blocking the flow of hydraulic oil is provided.

  The electronic control unit 42 is configured as a microprocessor centered on a CPU, and includes a ROM that stores a processing program, a RAM that temporarily stores data, and an input / output port. The electronic control unit 42 includes a signal indicating the accelerator opening A detected by each sensor (not shown), a signal indicating the engine rotation speed Ne, a signal indicating the primary pulley rotation speed (input shaft rotation speed) Nin, and a secondary pulley rotation. A signal indicating the speed (output shaft rotation speed) Nout, a signal indicating the vehicle speed V, and the like are input via the input port. On the other hand, from the electronic control unit 42, a line pressure control signal for controlling the line pressure PL, a clamping pressure control signal for controlling the belt clamping pressure Pd, and operation of the transmission hydraulic pump 60 (transmission electric motor 62). A shift control signal for controlling the state and an engine control signal for controlling the operating state of the engine 10 are respectively output to the regulator 56, the regulator 58, the shift electric motor 62, and the engine 10 via the output port. Yes.

  Next, the operation of the drive device for the belt type continuously variable transmission according to the present embodiment will be described.

  When the engine 10 is rotationally driven, the main pressure hydraulic pump 54 is rotationally driven using the power of the engine 10, and hydraulic oil is discharged from the main pressure hydraulic pump 54. The regulator 56 controls the line pressure (supply pressure to the hydraulic load) PL to the set pressure PL0, and the drive ratio of the shift hydraulic pump 60 controls the speed ratio γ of the belt type continuously variable transmission 14. At this time, the belt clamping pressure Pd is controlled to the set pressure Pd0 by the regulator 58, and the pulley oil having the smaller hydraulic oil pressure among the primary pulley oil chamber 30c and the secondary pulley oil chamber 32c is switched by the switching valve 64. Supplied to the chamber.

  On the other hand, when the operation of the engine 10 is stopped, the rotational driving of the source pressure hydraulic pump 54 is also stopped. Here, as a case where the operation of the engine 10 is stopped, for example, when the vehicle is stopped, the engine 10 is automatically stopped to perform idling stop, or only the power of the motor is used without using the power of the engine 10. A case where driving is performed (EV traveling is performed) is exemplified. In this case, the transmission hydraulic pump 60 is rotationally driven by the transmission electric motor 62, so that the transmission hydraulic pump 60 draws the hydraulic oil stored in the reservoir 52 to the suction-side oil passage 67 (check valve 65) and Intake through the clamping pressure supply oil passage 66, discharge the sucked hydraulic oil, and through the discharge side oil passage 68 (check valve 70) and the line pressure supply oil passage 57, hydraulic pressure such as the clutch C1 and the lubrication system. Can be supplied to the load. At that time, the transmission hydraulic pump 60 has a first port 60p communicating with the primary pulley oil chamber 30c and a second port 60s communicating with the secondary pulley oil chamber 32c. The pressure difference Pp−Ps with respect to the pulley oil chamber 32c can be adjusted, and the speed ratio γ of the belt type continuously variable transmission 14 can be adjusted.

  In a state where the pressure Ps of the secondary pulley oil chamber 32c is higher than the pressure Pp of the primary pulley oil chamber 30c, the switching valve 64 is switched to the first state as shown in FIG. While being connected to the oil chamber 30c and the first port 60p, the discharge side oil passage 68 is connected to the secondary pulley oil chamber 32c and the second port 60s. In this state, as shown in FIG. 2, the transmission hydraulic pump 60 generates torque in the transmission electric motor 62 in the direction in which the hydraulic oil is sucked from the first port 60p and discharged from the second port 60s. The hydraulic oil stored in the reservoir 52 is sucked from the first port 60p of the transmission hydraulic pump 60 via the suction side oil passage 67, and the hydraulic oil discharged from the second port 60s of the transmission hydraulic pump 60 is discharged. The oil is supplied to a hydraulic load such as the clutch C1 and the lubrication system via the oil passage 68. At the same time, the belt clamping pressure Pd can be adjusted by adjusting the pressure Pp of the primary pulley oil chamber 30c by the regulator 58, and the belt can be adjusted by adjusting the torque of the speed change electric motor 62 (speed change hydraulic pump 60). The speed ratio γ of the variable continuously variable transmission 14 can be adjusted.

  On the other hand, in the state where the pressure Pp of the primary pulley oil chamber 30c is higher than the pressure Ps of the secondary pulley oil chamber 32c, the switching valve 64 is switched to the second state as shown in FIG. The secondary pulley oil chamber 32c and the second port 60s communicate with each other, and the discharge side oil passage 68 communicates with the primary pulley oil chamber 30c and the first port 60p. In this state, as shown in FIG. 3, the transmission hydraulic pump 60 generates torque in the direction in which hydraulic oil is sucked from the second port 60s and discharged from the first port 60p, as shown in FIG. The hydraulic oil stored in the reservoir 52 is sucked from the second port 60s of the transmission hydraulic pump 60 through the suction-side oil passage 67, and the hydraulic oil discharged from the first port 60p of the transmission hydraulic pump 60 is the discharge side. The oil is supplied to a hydraulic load such as the clutch C1 and the lubrication system via the oil passage 68. At the same time, the belt clamping pressure Pd can be adjusted by adjusting the pressure Ps of the secondary pulley oil chamber 32c by the regulator 58, and the belt can be adjusted by adjusting the torque of the speed change electric motor 62 (speed change hydraulic pump 60). The speed ratio γ of the variable continuously variable transmission 14 can be adjusted.

  When hydraulic fluid discharged from the transmission hydraulic pump 60 is supplied to the hydraulic load via the discharge-side oil passage 68, the check-side valve 55 causes the discharge-side oil passage 68 (line pressure supply oil passage 57). From this, the flow of the hydraulic oil to the main pressure hydraulic pump 54 in the stopped state is interrupted. Then, the regulator 56 adjusts the line pressure (supply pressure to the hydraulic load) PL, and the regulator 56 is closed so that the operating oil flows from the discharge side oil passage 68 to the suction side oil passage 67 (clamping pressure supply oil passage 66). The flow is interrupted.

  As described above, according to the present embodiment, the shift hydraulic pump 60 is in a state where the first port 60p communicates with the primary pulley oil chamber 30c and the second port 60s communicates with the secondary pulley oil chamber 32c. Thus, the hydraulic oil stored in the reservoir 52 is sucked through the suction side oil passage 67 (check valve 65), and the sucked hydraulic oil is discharged and discharged through the discharge side oil passage 68 (check valve 70). Can be supplied to the hydraulic load. Therefore, even when the rotational drive of the main pressure hydraulic pump 54 is stopped, the clutch C1 and the lubrication are performed while adjusting the transmission gear ratio γ of the belt-type continuously variable transmission 14 by rotating the transmission hydraulic pump 60. The hydraulic oil can be supplied to a hydraulic load such as a system. At that time, hydraulic fluid can be supplied from the second port 60 s of the transmission hydraulic pump 60 to the hydraulic load, or hydraulic fluid can be supplied from the first port 60 p of the transmission hydraulic pump 60 to the hydraulic load. it can. Therefore, both deceleration operation (downshift) and acceleration operation (upshift) can be performed. Further, the belt clamping pressure Pd can be adjusted by the regulator 58. For example, when the engine 10 is automatically stopped when the vehicle is stopped, the transmission electric motor 62 generates torque in a direction in which the transmission hydraulic pump 60 draws hydraulic oil from the first port 60p and discharges it from the second port 60s. Thus, the hydraulic fluid discharged from the second port 60s of the transmission hydraulic pump 60 is discharged to the discharge-side oil passage 68 while the transmission gear ratio γ of the belt-type continuously variable transmission 14 is maintained in the maximum deceleration state (maximum transmission gear ratio γmax). It can supply to a hydraulic load via. In addition, even when EV traveling is performed using only the power of the motor, the hydraulic oil can be supplied to the hydraulic load while increasing / decreasing the transmission gear ratio γ by the transmission hydraulic pump 60. As described above, in the present embodiment, hydraulic oil can be supplied to the hydraulic load even during idling stop or EV traveling, and the main pressure hydraulic pump 54 does not need to be driven to rotate by the electric motor. Further, even when an abnormality occurs in the main pressure hydraulic pump 54 and it becomes difficult to discharge the hydraulic oil from the main pressure hydraulic pump 54, the transmission hydraulic pump 60 adjusts the gear ratio γ while adjusting the gear ratio γ. Hydraulic oil can be supplied.

  In Patent Document 2, in order to supply hydraulic oil from a shift hydraulic pump to a hydraulic load such as a lubrication system or a clutch of a forward / reverse switching device, one port of the shift hydraulic pump is selectively used as a primary pulley or a reservoir. It is necessary to additionally provide an electromagnetic switching valve to be connected to and a pressure-sensitive valve (or electromagnetic on-off valve) that opens and closes communication between the other port of the transmission hydraulic pump and the discharge side of the main pressure hydraulic pump. Therefore, the cost of the apparatus is increased. On the other hand, in the present embodiment, by adding a simple configuration of the suction side oil passage 67 and the discharge side oil passage 68, the operation to the hydraulic load is performed while adjusting the speed ratio γ using the speed change hydraulic pump 60. Oil can be supplied. As a result, the cost of the apparatus can be reduced.

  In the present embodiment, the transmission hydraulic pump 60 has not only a function of adjusting the transmission gear ratio γ but also a function of supplying hydraulic oil to the hydraulic load. Therefore, the source pressure hydraulic pump 54 can be omitted.

  Next, another configuration example of this embodiment will be described.

  FIG. 4 shows a configuration example in which a switching valve (pressure line side switching valve) 71 in Patent Document 3 is provided in comparison with the configuration example of FIG. The switching valve 71 is arranged in parallel with the check valve 70 in the discharge side oil passage 69 for connecting the discharge side port 64b of the switching valve 64 to the line pressure supply oil passage 57 (hydraulic load such as the clutch C1 and the lubrication system). The output port 71 a of the switching valve 71 is connected to the discharge side port 64 b of the switching valve 64 through a throttle (orifice) 78. The switching valve 71 communicates the output port 71a with the line pressure supply oil passage 57 and outputs the first communication state (state on the left side in FIG. 4) in which communication between the output port 71a and the clamping pressure supply oil passage 66 is interrupted. A second communication state (the state on the right side of FIG. 4) in which the port 71a is communicated with the clamping pressure supply oil passage 66 and the communication between the output port 71a and the line pressure supply oil passage 57 is interrupted, and the output port 71a and the line pressure supply. It is possible to selectively switch to a cut-off state (the state in the center of FIG. 4) in which communication with the oil passage 57 and the clamping pressure supply oil passage 66 is cut off. By switching the switching valve 71 between the first communication state and the shut-off state, the communication between the discharge side port 64b of the switching valve 64 and the hydraulic load via the switching valve 71 can be opened and closed. In addition, about the switching valve 71, it can comprise with the electromagnetic switching valve which can be switched by the control signal output from the electronic control apparatus 42, for example. Also in the configuration example shown in FIG. 4, the transmission hydraulic pump 60 is connected to the reservoir 52 in a state where the first port 60p communicates with the primary pulley oil chamber 30c and the second port 60s communicates with the secondary pulley oil chamber 32c. The stored hydraulic fluid is sucked in through the suction side oil passage 67 (check valve 65), and the sucked hydraulic oil is discharged and supplied to the hydraulic load through the discharge side oil passage 68 (check valve 70). can do.

  Furthermore, in the configuration example shown in FIG. 4, when the switching valve 64 is in the first state described above (Ps> Pp is established), the switching valve 71 is switched to the first communication state described above, thereby supplying the clamping pressure. The oil passage 66 can be communicated with the primary pulley oil chamber 30c, and the line pressure supply oil passage 57 (the discharge port 54a of the original pressure hydraulic pump 54) can be communicated with the secondary pulley oil chamber 32c. Thus, when the engine 10 (original pressure hydraulic pump 54) is driven to rotate, the pressure Ps in the secondary pulley oil chamber 32c is set to the primary pulley oil chamber 30c even if the torque generated by the speed change electric motor 62 is zero. The pressure Pp can be kept higher. Therefore, even if an abnormality occurs in the transmission hydraulic pump 60 or the transmission electric motor 62 when the switching valve 64 is in the first state, the switching valve 71 is switched to the first communication state and the The gear ratio γ can be adjusted by adjusting the pressure Ps of the pulley oil chamber 32c and the pressure Pp of the primary pulley oil chamber 30c. Further, when the speed change hydraulic pump 60 performs a deceleration operation (downshift) while the main pressure hydraulic pump 54 is rotationally driven, the switching valve 71 is connected to the first communication when the switching valve 64 is in the first state. By switching to the state, it is possible to assist the deceleration operation by the shift hydraulic pump 60. Therefore, the deceleration speed can be increased, and the response of the shift control can be improved.

  When the switching valve 64 is in the second state described above (Pp> Ps is established), the switching valve 71 is switched to the second communication state described above so that the clamping pressure supply oil passage 66 is connected to the primary pulley oil chamber. It can be made to communicate with both 30c and the secondary pulley oil chamber 32c. Therefore, when the deceleration hydraulic pump 60 performs a deceleration operation while the main pressure hydraulic pump 54 is rotationally driven, the switching valve 71 is switched to the second communication state when the switching valve 64 is in the second state. Thus, not only the hydraulic oil is supplied from the primary pulley oil chamber 30c to the secondary pulley oil chamber 32c by the speed change hydraulic pump 60, but the hydraulic oil is supplied from the primary pulley oil chamber 30c to the clamping pressure supply oil passage 66 via the switching valve 71. Can be discharged. Therefore, the deceleration speed can be increased. Further, even if an abnormality occurs in the speed change hydraulic pump 60 or the speed change electric motor 62 when the changeover valve 64 is in the second state, the changeover valve 71 is changed to the second communication state, thereby enabling the primary pulley oil chamber 30c to be switched. The pressure Pp of the secondary pulley and the pressure Ps of the secondary pulley oil chamber 32c can be kept equal, and a sudden change in the gear ratio γ can be suppressed. Refer to Patent Document 3 for details of the above operation.

  In the configuration example shown in FIG. 4, the switching valve 71 and the check valve 70 are provided in parallel between the discharge side port 64 b of the switching valve 64 and the line pressure supply oil passage 57. As shown, the check valve 70 and the discharge side oil passage 68 provided in parallel with the switching valve 71 (discharge side oil passage 69) can be omitted. In the configuration example shown in FIG. 5, when the rotational drive of the main pressure hydraulic pump 54 (engine 10) is stopped, the changeover valve 71 is switched to the first communication state and the transmission electric motor 62 is rotationally driven. The transmission hydraulic pump 60 sucks the hydraulic oil stored in the reservoir 52 through the suction side oil passage 67 (check valve 65), discharges the sucked hydraulic oil, and discharges the hydraulic oil 69 (switching valve). 71) to the hydraulic load.

  FIG. 6 shows a configuration example in which the regulator 56 and the check valve 70 are omitted compared to the configuration example of FIG. A discharge port 54 a of the source pressure hydraulic pump 54 is connected to a sandwiching pressure supply oil passage 66 through a check valve 55. Between the clamping pressure supply oil passage 66 (discharge port 54a of the source pressure hydraulic pump 54) and the line pressure supply oil passage 57 (hydraulic load), the operation from the clamping pressure supply oil passage 66 to the line pressure supply oil passage 57 is performed. A check valve 73 is provided that allows the oil flow and blocks the flow of hydraulic oil from the line pressure supply oil passage 57 to the pinching pressure supply oil passage 66.

  In the configuration example shown in FIG. 6, when the engine 10 (original pressure hydraulic pump 54) is rotationally driven, the hydraulic oil discharged from the original pressure hydraulic pump 54 is supplied to the hydraulic load via the check valves 55 and 73. Supplied. On the other hand, when the main pressure hydraulic pump 54 is stopped, the gear shift hydraulic pump 60 rotates and drives the gear shift electric motor 62 so that the first port 60p communicates with the primary pulley oil chamber 30c and the second port 60p. With the port 60s communicating with the secondary pulley oil chamber 32c, the hydraulic oil stored in the reservoir 52 is sucked through the suction-side oil passage 67 (check valve 65), and the sucked hydraulic oil is discharged. Thus, it can be supplied to the hydraulic load via the discharge side oil passage 68. In this case, the check valve 73 blocks the flow of hydraulic oil from the discharge side oil passage 68 to the suction side oil passage 67. According to the configuration example shown in FIG. 6, the configuration of the hydraulic control device 40 can be simplified by omitting the regulator 56.

  Further, in the configuration example shown in FIG. 7, the suction side for connecting the reservoir 52 to the first port 60p of the transmission hydraulic pump 60 and the primary pulley oil chamber 30c via a check valve (suction side check valve) 85. An oil passage 87 is provided. Here, the check valve 85 allows the hydraulic oil to flow from the reservoir 52 to the first port 60p and the primary pulley oil chamber 30c, and allows the hydraulic oil to flow from the first port 60p and the primary pulley oil chamber 30c to the reservoir 52. To block the flow. Further, a discharge-side oil passage 88 is provided for connecting the second port 60s of the transmission hydraulic pump 60 and the secondary pulley oil chamber 32c to the line pressure supply oil passage 57 (hydraulic load such as the clutch C1 and the lubrication system). Yes. The discharge side oil passage 88 permits the flow of hydraulic oil from the second port 60s and the secondary pulley oil chamber 32c to the line pressure supply oil passage 57 (hydraulic load) and from the line pressure supply oil passage 57 (hydraulic load). A check valve (discharge-side check valve) 90 that cuts off the flow of hydraulic oil to the second port 60s and the secondary pulley oil chamber 32c is provided. The discharge side port 64b of the switching valve 64 is closed.

  In the configuration example shown in FIG. 7, when the source pressure hydraulic pump 54 is stopped, the shift hydraulic pump 60 changes the torque in the direction in which the hydraulic oil is sucked from the first port 60 p and discharged from the second port 60 s. By generating the electric motor 62, the hydraulic oil stored in the reservoir 52 is sucked from the first port 60p of the transmission hydraulic pump 60 via the suction side oil passage 87 (check valve 85), and the transmission hydraulic pressure is thus obtained. The hydraulic oil discharged from the second port 60s of the pump 60 is supplied to a hydraulic load such as the clutch C1 and the lubrication system via the discharge-side oil passage 88 (check valve 90). At this time, since the first port 60p communicates with the primary pulley oil chamber 30c and the second port 60s communicates with the secondary pulley oil chamber 32c, the torque of the transmission electric motor 62 (transmission hydraulic pump 60). The gear ratio γ of the belt-type continuously variable transmission 14 can be adjusted by adjusting the, so that a deceleration operation can be performed.

  In the configuration example shown in FIG. 8, the suction side for connecting the reservoir 52 to the second port 60 s of the transmission hydraulic pump 60 and the secondary pulley oil chamber 32 c via a check valve (suction side check valve) 95. An oil passage 97 is provided. The check valve 95 here allows the flow of hydraulic oil from the reservoir 52 to the second port 60 s and the secondary pulley oil chamber 32 c, and the hydraulic oil from the second port 60 s and the secondary pulley oil chamber 32 c to the reservoir 52. To block the flow. Further, a discharge side oil passage 98 is provided for connecting the first port 60p of the transmission hydraulic pump 60 and the primary pulley oil chamber 30c to the line pressure supply oil passage 57 (hydraulic load such as the clutch C1 and the lubrication system). Yes. The discharge side oil passage 98 allows the flow of hydraulic oil from the first port 60p and the primary pulley oil chamber 30c to the line pressure supply oil passage 57 (hydraulic load) and from the line pressure supply oil passage 57 (hydraulic load). A check valve (discharge-side check valve) 100 that shuts off the flow of hydraulic oil to the first port 60p and the primary pulley oil chamber 30c is provided. The discharge side port 64b of the switching valve 64 is closed.

  In the configuration example shown in FIG. 8, when the source pressure hydraulic pump 54 is stopped, the shift hydraulic pump 60 changes the torque in the direction in which the hydraulic oil is sucked from the second port 60 s and discharged from the first port 60 p. The hydraulic oil stored in the reservoir 52 is sucked from the second port 60s of the transmission hydraulic pump 60 through the suction side oil passage 97 (check valve 95) by being generated in the electric motor 62, and the transmission hydraulic pressure is generated. The hydraulic oil discharged from the first port 60p of the pump 60 is supplied to a hydraulic load such as the clutch C1 and the lubrication system via the discharge side oil passage 98 (check valve 100). At this time, since the first port 60p communicates with the primary pulley oil chamber 30c and the second port 60s communicates with the secondary pulley oil chamber 32c, the torque of the transmission electric motor 62 (transmission hydraulic pump 60). By adjusting the gear ratio, the gear ratio γ of the belt type continuously variable transmission 14 can be adjusted, and the speed increasing operation can be performed.

  In the above description of the embodiment, the switching valve 64 is constituted by a pilot pressure switching valve. However, in this embodiment, the switching valve 64 can also be configured by an electromagnetic switching valve.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

It is a figure which shows schematic structure of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure explaining operation | movement of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure explaining operation | movement of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the drive device of the belt-type continuously variable transmission which concerns on embodiment of this invention.

Explanation of symbols

  10 engine, 14 belt type continuously variable transmission, 30 primary pulley, 32 secondary pulley, 34 endless belt, 40 hydraulic control device, 42 electronic control device, 52 reservoir, 54 source pressure hydraulic pump, 55, 65, 70, 72, 73, 85, 90, 95, 100 Check valve, 56, 58 Regulator, 57 Line pressure supply oil passage, 60 Transmission hydraulic pump, 62 Transmission electric motor, 64, 71 Switching valve, 66 Nipping pressure supply oil passage, 67, 87, 97 Suction side oil passage, 68, 69, 88, 98 Discharge side oil passage, 74 Bypass oil passage, C1 clutch.

Claims (5)

A belt type continuously variable transmission drive device that changes a gear ratio by changing a belt engagement diameter to a primary pulley and a secondary pulley,
A transmission pump having a first port communicating with the primary pulley and a second port communicating with the secondary pulley and capable of changing a gear ratio by moving hydraulic oil between the primary pulley and the secondary pulley. When,
A first state having a suction side port and a discharge side port, wherein the first port and the primary pulley communicate with the suction side port, and the second port and the secondary pulley communicate with the discharge side port; and the second port and the secondary pulley A switching means capable of selectively switching to a second state in which the first port and the primary pulley are in communication with the discharge side port, and
A suction-side oil passage for connecting a reservoir in which hydraulic oil is stored to a suction-side port via suction-side check means, wherein the suction-side check means reduces the flow of hydraulic oil from the reservoir to the suction-side port. An intake side oil passage that is a means for allowing and blocking the flow of hydraulic oil from the intake side port to the reservoir;
A discharge-side oil passage for connecting the discharge-side port to a hydraulic load;
A source pressure pump capable of sucking and discharging the hydraulic oil stored in the reservoir, the source pressure pump capable of supplying the discharged hydraulic oil to the suction side port and the hydraulic load;
A source pressure-side check means that allows the flow of hydraulic oil from the source pressure pump to the hydraulic load and blocks the flow of hydraulic oil from the hydraulic load to the source pressure pump;
Blocking means capable of blocking the flow of hydraulic oil from the discharge side oil passage to the suction side oil passage;
With
In the discharge side oil passage, discharge side check means for permitting the flow of hydraulic oil from the discharge side port to the hydraulic load and blocking the flow of hydraulic oil from the hydraulic load to the discharge side port, or the discharge side port and the hydraulic pressure Opening and closing means for opening and closing communication with the load is provided,
When supplying hydraulic oil to the hydraulic load while the main pressure pump is stopped, the speed change pump sucks the hydraulic oil stored in the reservoir through the suction side oil passage, and discharges the sucked hydraulic oil. you supplied to the hydraulic load via the discharge-side oil passage, the belt type continuously variable transmission drive system. A belt type continuously variable transmission drive device according to claim 1,
The switching means switches to the first state when the hydraulic oil pressure of the secondary pulley is higher than the primary oil pressure, and the primary pulley hydraulic oil pressure is higher than the secondary pulley hydraulic oil pressure. A driving device for a belt-type continuously variable transmission that switches to the second state . A belt type continuously variable transmission drive device according to claim 1 or 2 ,
A drive device for a belt-type continuously variable transmission, comprising pressure adjusting means for adjusting the pressure of hydraulic oil supplied to a suction side port . A belt type continuously variable transmission drive device that changes a gear ratio by changing a belt engagement diameter to a primary pulley and a secondary pulley ,
A transmission pump having a first port communicating with the primary pulley and a second port communicating with the secondary pulley and capable of changing a gear ratio by moving hydraulic oil between the primary pulley and the secondary pulley. When,
A suction-side oil passage for connecting a reservoir storing hydraulic oil to a first port and a primary pulley via suction-side check means, wherein the suction-side check means is connected from the reservoir to the first port and the primary pulley. A suction-side oil passage that is a means for allowing the flow of hydraulic oil from the first port and the primary pulley to the reservoir,
A discharge-side oil passage for connecting the second port and the secondary pulley to the hydraulic load;
A source pressure pump capable of sucking and discharging the hydraulic oil stored in the reservoir, wherein the discharged hydraulic oil can be supplied to either the primary pulley or the secondary pulley and a hydraulic load. A pump,
A source pressure-side check means that allows the flow of hydraulic oil from the source pressure pump to the hydraulic load and blocks the flow of hydraulic oil from the hydraulic load to the source pressure pump;
With
The discharge-side oil passage has discharge-side check means that allows the flow of hydraulic oil from the second port and the secondary pulley to the hydraulic load and blocks the flow of hydraulic oil from the hydraulic load to the second port and the secondary pulley. Provided,
When supplying hydraulic oil to the hydraulic load while the main pressure pump is stopped, the speed change pump sucks the hydraulic oil stored in the reservoir through the suction side oil passage, and discharges the sucked hydraulic oil. A belt-type continuously variable transmission drive device that supplies a hydraulic load via a discharge-side oil passage . A belt type continuously variable transmission drive device that changes a gear ratio by changing a belt engagement diameter to a primary pulley and a secondary pulley ,
A transmission pump having a first port communicating with the primary pulley and a second port communicating with the secondary pulley and capable of changing a gear ratio by moving hydraulic oil between the primary pulley and the secondary pulley. When,
A suction-side oil passage for connecting a reservoir in which hydraulic fluid is stored to a second port and a secondary pulley via suction-side check means, wherein the suction-side check means is connected from the reservoir to the second port and the secondary pulley. A suction-side oil passage that is a means that allows the flow of the hydraulic oil and blocks the flow of the hydraulic oil from the second port and the secondary pulley to the reservoir;
A discharge-side oil passage for connecting the first port and the primary pulley to a hydraulic load;
A source pressure pump capable of sucking and discharging the hydraulic oil stored in the reservoir, wherein the discharged hydraulic oil can be supplied to either the primary pulley or the secondary pulley and a hydraulic load. A pump,
A source pressure-side check means that allows the flow of hydraulic oil from the source pressure pump to the hydraulic load and blocks the flow of hydraulic oil from the hydraulic load to the source pressure pump;
With
The discharge-side oil passage has discharge-side check means for allowing the hydraulic oil to flow from the first port and the primary pulley to the hydraulic load and blocking the hydraulic oil from the hydraulic load to the first port and the primary pulley. Provided,
When supplying hydraulic oil to the hydraulic load while the main pressure pump is stopped, the speed change pump sucks the hydraulic oil stored in the reservoir through the suction side oil passage, and discharges the sucked hydraulic oil. A belt-type continuously variable transmission drive device that supplies a hydraulic load via a discharge-side oil passage .

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