JP2011247147A - Working oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working oil supply device in which increment of leakage quantity of working oil can be suppressed, and work of a pump therefore can be reduced effectively, with simple constitution.SOLUTION: The working oil supply device includes: a vane pump 30 which delivers working oil sucked from a first sucking port P1 communicated with a first oil tank 21 from a first delivery port Q1 during one rotation of a rotor 31, also delivers the working oil sucked from a second sucking port P2 communicated with a second oil tank 22 from a second delivery port Q2; a hydraulic circuit 40 of a high pressure system to be supplied with the working oil delivered from the first delivery port Q1 and pressure-adjusted to high pressure by a high pressure adjusting valve 23; and a hydraulic circuit 50 of a low pressure system to be supplied with the working oil delivered from the second delivery port Q2 and pressure-adjusted to low pressure by a low pressure adjusting valve 24. Working oil of the first oil sump 21 caused to circulate in the hydraulic circuit 40 of the high pressure system and working oil of the second oil tank 22 caused to circulate in the hydraulic circuit 50 of the low pressure system are circulated by different systems without mixing.

Description

  The present invention relates to a hydraulic fluid supply device for supplying hydraulic fluid to a hydraulic circuit mounted on a transmission or the like, and in particular, discharges hydraulic fluid sucked from a suction port according to rotation of a rotor from a discharge port. The present invention relates to a hydraulic oil supply device including a vane pump having a configuration.

  An automatic transmission mounted on a vehicle is provided with a hydraulic circuit that supplies hydraulic oil for performing shift control and lubrication / cooling. A general hydraulic circuit provided in an automatic transmission lubricates a high-pressure hydraulic circuit (high-pressure circuit) for operating a clutch or brake for shift control, a torque converter (TC), a clutch, a brake, or a bearing. -It is often divided into two systems: a low-pressure hydraulic circuit (low-pressure circuit) for supplying hydraulic fluid for cooling.

  The hydraulic circuit as described above is usually provided with a hydraulic pump including a set of external / internal gear pumps and vane pumps. However, in such a hydraulic pump, although there are two systems of hydraulic oil supply destinations, a high pressure circuit and a low pressure circuit, there is only one hydraulic oil discharge path. Therefore, the discharge path of the one system must be connected to the high-pressure circuit, and the low-pressure circuit is supplied after a part of the hydraulic fluid supplied to the high-pressure circuit is depressurized by a separate decompression mechanism. is doing. Therefore, the configuration of the hydraulic circuit has been complicated. Further, in this configuration, the hydraulic oil to be supplied to the low pressure circuit is discharged at a higher pressure than necessary, which is a factor that increases pump work. Furthermore, in order to decompress the hydraulic oil discharged from the hydraulic pump, a part of the hydraulic oil has to be discharged. Therefore, a pump discharge amount that is higher than the originally required flow rate is required, and this is also a factor that increases pump work.

  Therefore, as shown in Patent Document 1, a vane pump having two sets of suction / discharge ports and performing a plurality of suction / discharge processes per rotation has been put into practical use. In other words, the vane pump described in Patent Document 1 has first and second suction ports and first and second discharge ports, and the working oil sucked from the first suction port during one rotation of the rotor. The hydraulic oil is discharged from the first discharge port, and the hydraulic oil sucked from the second suction port is discharged from the second discharge port. With such a vane pump, since the hydraulic oil discharge destinations are two systems, it is possible to classify the hydraulic oil supply destination by connecting one to the high-pressure circuit and the other to the low-pressure circuit.

  Further, in the vane pump that performs the suction / discharge process a plurality of times per one rotation as described above, when the required discharge amount is small, one of the two suction / discharge ports is set between the suction / discharge ports by switching a valve or the like. A circuit having a function of reducing the driving torque of the pump has been put to practical use by adopting such a circulation circuit.

JP 2001-173575 A

  However, in the vane pump as shown in Patent Document 1, since the first suction port and the second suction port are connected to the same oil tank, the hydraulic oil in the high-pressure circuit and the hydraulic oil in the low-pressure circuit are sucked into the vane pump. From the discharge process to the discharge process. Therefore, for example, when a stall or the like occurs in the torque converter, the operating oil that has become hot in the torque converter (in the low-pressure circuit) is unified with the operating oil in the high-pressure circuit when passing through the vane pump. Thereby, high temperature hydraulic fluid will be supplied to a high voltage circuit. Such high-temperature hydraulic oil has a reduced viscosity as the oil temperature rises, leading to an increase in the amount of leakage in the high-pressure circuit. In particular, in a high-pressure circuit where the hydraulic pressure in the circuit is high, the influence of an increase in leakage becomes significant. Also, in the design of the oil pump, the size of the oil pump is determined in advance in anticipation of an increase in leakage due to high oil temperature. Therefore, the size of the oil pump is increased, and there is a problem that the surplus discharge amount increases in normal use. The above problem can be solved by installing dedicated oil pumps for the high-pressure circuit and the low-pressure circuit respectively, but there is a disadvantage in terms of manufacturing costs, weight, component layout, etc. of the automatic transmission and the vehicle. .

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a hydraulic oil supply device that can suppress an increase in the amount of hydraulic oil leakage with a simple configuration and can effectively reduce pump work. There is.

  In order to solve the above problems, a hydraulic oil supply device according to the present invention is a hydraulic oil supply device (10) for supplying hydraulic oil to a hydraulic circuit included in a transmission (1). It has a suction port (P1, P2) and first and second discharge ports (Q1, Q2), and first discharges hydraulic oil sucked from the first suction port (P1) during one rotation of the rotor (31). A first pump communicating with the first suction port (P1) and a vane pump (30) that discharges the hydraulic oil sucked from the second suction port (P2) from the second suction port (Q2) while discharging from the port (Q1). The oil sump (21), the second oil sump (P2) communicating with the second suction port (P2), and the high-pressure regulating valve (23 for regulating the hydraulic fluid discharged from the first discharge port (Q1) to a high pressure ) And the operation regulated by the high-pressure regulating valve (23) Is supplied with a high pressure hydraulic circuit (40), a low pressure regulating valve (24) for regulating the hydraulic oil discharged from the second discharge port (Q2) to a low pressure, and the low pressure regulating valve (24). A low-pressure hydraulic circuit (50) to which regulated hydraulic oil is supplied, and passes through the first suction port (P1) and the first discharge port (Q1) to the high-pressure hydraulic circuit (40). Hydraulic oil in the first oil sump (21), and the operation of the second oil sump (22) reaching the low-pressure hydraulic circuit (50) through the second suction port (P2) and the second discharge port (Q2). The oil is configured to circulate in a separate system without mixing.

  According to the hydraulic oil supply device of the present invention, the hydraulic oil in the first oil reservoir supplied in the high-pressure system that reaches the high-pressure hydraulic circuit through the first suction port and the first discharge port, and the second suction port In addition, the hydraulic oil in the second oil reservoir supplied in the low-pressure system that reaches the low-pressure hydraulic circuit through the second discharge port is circulated in a separate system without being mixed. As a result, in a vane pump having a single discharge oil passage, the entire amount of hydraulic oil is discharged to the high-pressure hydraulic circuit, whereas according to the present invention, the high-pressure hydraulic circuit and the low-pressure hydraulic circuit are discharged. Since the hydraulic oil can be discharged separately in the hydraulic circuit, the discharge amount of the hydraulic oil can be reduced. Therefore, the pump work required for the vane pump can be reduced. In addition, since the amount of discharged oil that has been conventionally required to depressurize the hydraulic oil discharged from the vane pump can be reduced, the pump work can be reduced in this respect as well. Furthermore, the first oil sump connected to the first suction port and the second oil sump connected to the second suction port are separately provided, so that the hydraulic oil circulating in the low-pressure hydraulic circuit and the high-pressure system The hydraulic oil circulating in the hydraulic circuit is not unified. Therefore, even when the hydraulic oil in the low-pressure hydraulic circuit becomes high temperature, the oil temperature rise in the high-pressure hydraulic circuit can be prevented, and the leakage amount of the hydraulic oil in the high-pressure hydraulic circuit can be effectively reduced. Therefore, since the vane pump can be reduced in size, pump work can be reduced. Furthermore, since a high-pressure system and a low-pressure system can be realized with a simple configuration including a single vane pump, the configuration of the hydraulic oil supply device and the transmission can be simplified, reduced in weight, and reduced in cost. Can do.

In the above hydraulic fluid supply apparatus, the high pressure hydraulic circuit (40) includes a clutch hydraulic circuit (41), a brake hydraulic circuit (42), and a synchromesh. At least one of the hydraulic circuit (43) for operating the shift actuator in the mechanism is included, and the low-pressure hydraulic circuit (50) includes a torque converter (51) and a transmission (1) included in the transmission (1). It is preferable that at least one of the lubricating circuit (52) and the cooling circuit (53) included in In other words, a high-pressure hydraulic circuit is provided with a hydraulic circuit for operating a clutch or a brake that requires a relatively high-pressure hydraulic oil, and a relatively low-pressure hydraulic oil is sufficient for a low-pressure hydraulic circuit. Arrange circuits for lubrication and cooling. According to this configuration, the high pressure hydraulic oil supplied to the hydraulic circuit for operating the shift actuator of the clutch, brake, and synchromesh mechanism included in the high pressure hydraulic circuit, and the torque converter included in the low pressure hydraulic circuit, There is no mixing with the low-pressure hydraulic fluid supplied to the lubricating circuit or the cooling circuit. Accordingly, there is no possibility that hydraulic oil that has become hot in the low-pressure hydraulic circuit is introduced into the high-pressure hydraulic circuit, so that the amount of hydraulic oil leaked in the high-pressure hydraulic circuit can be reduced. Thereby, since the size of the vane pump can be reduced, the surplus discharge amount can be suppressed to be small in normal use, and the pump work can be reduced.
In addition, the code | symbol in said parenthesis shows the code | symbol of the component in embodiment mentioned later as an example of this invention.

  According to the hydraulic oil supply apparatus according to the present invention, an increase in the amount of hydraulic oil leakage can be suppressed with a simple configuration including a single vane pump, and pump work can be effectively reduced.

It is the schematic which shows the structural example of the hydraulic-oil supply apparatus concerning one Embodiment of this invention. It is the schematic which shows the structural example of the automatic transmission provided with the hydraulic fluid supply apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram illustrating a configuration example of a hydraulic oil supply device 10 according to an embodiment of the present invention. The hydraulic oil supply device 10 shown in FIG. 1 includes a first oil tank 21 and a second oil tank 22, which are oil reservoirs separated from each other, a vane pump 30, a high pressure pressure regulating valve 23, and a low pressure pressure regulating valve 24. It is prepared for. The vane pump 30 includes a first suction port P1 and a second suction port P2, and a first discharge port Q1 and a second discharge port Q2, which are disposed to face each other with the rotation shaft 31a of the rotor 31 interposed therebetween. . The first suction port P1 is connected to the first oil tank 21 via the oil passage 33, and the second suction port P2 is connected to the second oil tank 22 via the oil passage 34. On the other hand, the first discharge port Q1 is connected to the high pressure regulating valve 23 via the oil passage 35, and the downstream side of the high pressure regulating valve 23 is connected to a high pressure hydraulic circuit (high pressure circuit) 40. . The second discharge port Q2 is connected to the low pressure regulating valve 24 via an oil passage 36, and the downstream side of the low pressure regulating valve 24 is connected to a low pressure hydraulic circuit (low pressure circuit) 50. . The hydraulic oil supplied to the high-pressure circuit 40 exits the high-pressure circuit 40, and then returns to the first oil tank 21 through the oil passage 37. The hydraulic oil supplied to the low-pressure circuit 50 is After leaving the low pressure circuit 50, the oil is returned to the second oil tank 22 through the oil passage 38.

  The vane pump 30 discharges the working oil sucked from the first suction port P1 from the first discharge port Q1 and the working oil sucked from the second suction port P2 from the second discharge port Q2 while the rotor 31 makes one rotation. It is comprised so that it may discharge.

  In this hydraulic oil supply device 10, the operation of the first oil tank 21 that is supplied in a high-pressure system that reaches the high-pressure circuit 40 through the high-pressure regulating valve 23 through the first suction port P1 and the first discharge port Q1. The oil and the hydraulic oil in the second oil tank 22 supplied in the low pressure system that passes through the second suction port P2 and the second discharge port Q2 and reaches the low pressure circuit 50 through the low pressure regulating valve 24 are not mixed. It is configured to circulate in a separate system.

  FIG. 2 is a schematic diagram illustrating a configuration example of the automatic transmission 1 including the hydraulic oil supply device 10. An automatic transmission 1 shown in FIG. 1 includes a gear mechanism 3 having rotating parts such as a gear, a clutch, and a brake that are rotatably installed around a plurality of rotating shafts, and an automatic transmission 1 including the gear mechanism 3. And a casing 2 that defines a machine room 5 that accommodates these components. A control body (valve body) 6 is installed on the side of the machine room 5. The control body 6 includes a mechanism such as a hydraulic control valve 6a for controlling the operation of a shift speed setting clutch, a brake, and the like.

  A separate plate 7 is installed between the machine room 5 and the control body 6. The separate plate 7 is a flat plate member standing on the bottom surface 2 a of the casing 2, and the first oil tank 21 and the second oil tank 22 provided at the bottom of the casing 2 are partitioned by the separate plate 7. Thus, the flow of hydraulic oil between the first oil tank 21 and the second oil tank 22 is blocked. Although not shown in detail, the oil passage 33 (see FIG. 1) connected to the first suction port P1 of the vane pump 30 is disposed so as to suck the working oil in the first oil tank 21. The oil passage 34 (see FIG. 1) connected to the second suction port P2 of the vane pump 30 is disposed so as to suck the working oil in the second oil tank 22. In the automatic transmission 1, hydraulic oil discharged from the vane pump 30 is supplied to the control body 6 and the gear mechanism 3 by the hydraulic oil supply device 10 shown in FIG. 1, such as clutches, brakes, gears, and bearings. It is supplied to the mechanism.

  Specifically, as shown in FIG. 1, the high-pressure circuit 40 to which high-pressure hydraulic oil discharged from the first discharge port Q1 of the vane pump 30 and regulated by the high-pressure regulating valve 23 is supplied is provided with an automatic transmission. The clutch operating hydraulic circuit 41, the brake operating hydraulic circuit 42, and the synchromesh mechanism shift actuator operating hydraulic circuit 43 included in the machine 1 are included. Although the detailed illustration is omitted here, the synchromesh mechanism is a mechanism for synchronizing a gear for setting a gear position that is installed coaxially with the rotation shaft so as to be relatively rotatable. The sleeve includes a sleeve that slides in the direction, a shift fork for driving the sleeve, and the like. The shift actuator of the synchromesh mechanism includes a hydraulic cylinder for moving the shift fork in the axial direction.

  On the other hand, a low-pressure circuit 50 supplied with low-pressure hydraulic oil discharged from the second discharge port Q2 of the vane pump 30 and regulated by the low-pressure regulating valve 24 is provided with a torque converter 51 provided in the automatic transmission 1, and for lubrication. At least one of the circuit 52 and the cooling circuit 53 is included. The lubricating circuit 52 or the cooling circuit 53 referred to here is a hydraulic oil supplied for the purpose of lubrication or cooling to a mechanism that requires lubrication or cooling, such as a clutch, brake, bearing, and gear in the automatic transmission 1. The circuit which circulates.

  The hydraulic oil supplied from the first oil tank 21 to the high-pressure circuit 40 is used for the operation of a clutch, a brake, etc., and then collected in the first oil tank 21 so that only the high-pressure circuit 40 is used. It comes to circulate. On the other hand, the hydraulic oil supplied from the second oil tank 22 to the low-pressure circuit 50 is used for lubrication and cooling of gears and bearings, and then recovered in the second oil tank 22, whereby the low-pressure circuit 50. Only to circulate.

  As described above, in the hydraulic oil supply device 10 of the present embodiment, the hydraulic oil in the first oil tank 21 that is supplied in a high-pressure system that reaches the high-pressure circuit 40 through the first suction port P1 and the first discharge port Q1. And the hydraulic oil in the second oil tank 22 supplied in the low pressure system that reaches the low pressure circuit 50 through the second suction port P2 and the second discharge port Q2 are circulated in a separate system without mixing. ing. Therefore, in the conventional vane pump with one discharge oil passage, the entire amount of hydraulic oil is discharged to the high-pressure hydraulic circuit, whereas the vane pump 30 provided in the hydraulic oil supply device 10 having the above-described configuration according to the present invention. According to this, since the hydraulic oil can be discharged separately to the high-pressure circuit 40 and the low-pressure circuit 50, the discharge amount of the hydraulic oil can be reduced. Therefore, the pump work required for the vane pump 30 can be reduced.

  Further, according to the vane pump 30 provided in the hydraulic oil supply device 10 according to the present invention, the amount of discharged oil necessary for reducing the pressure of the hydraulic oil discharged from the vane pump in the conventional configuration can be reduced. Work can be reduced. Further, the first oil tank 21 connected to the first suction port P1 and the second oil tank 22 connected to the second suction port P2 are separately provided, so that the hydraulic oil circulating in the high-pressure circuit 40 and the low-pressure The hydraulic oil circulating in the circuit 50 does not have to be unified. Therefore, even when the hydraulic oil in the low-pressure circuit 50 becomes high temperature, an increase in the oil temperature of the high-voltage circuit 40 can be prevented, and the leakage amount of the hydraulic oil in the high-pressure circuit 40 can be effectively reduced. Thereby, since the vane pump 30 can be reduced in size, pump work can be reduced. In addition, since the high-pressure system and the low-pressure system can be realized with a simple configuration including the single vane pump 30, the configuration of the hydraulic oil supply device 10 and the automatic transmission 1 can be simplified, reduced in weight, and reduced in cost. Can be achieved.

  Further, according to the hydraulic oil supply device 10 of the present embodiment, by using the vane pump 30 that performs the suction / discharge process a plurality of times per one rotation, a single vane pump 30 can be configured with a plurality of circuits (the high pressure circuit 40 and the low pressure circuit). It is possible to supply hydraulic pressure individually to the circuit 50). In addition, by separately setting each suction / discharge path, it is possible to control without mixing the hydraulic oil circulating in the high-pressure circuit 40 and the hydraulic oil circulating in the low-pressure circuit 50 that are separated from each other. Further, since the hydraulic oil to the low pressure circuit 50 and the hydraulic oil to the high pressure circuit 40 are separately discharged, the driving work of the vane pump 30 can be reduced.

  Further, in the hydraulic oil supply device 10 described above, the high pressure circuit 40 includes the hydraulic circuit 41 for operating the clutch of the automatic transmission 1, the hydraulic circuit 42 for operating the brake, and the hydraulic circuit for operating the shift actuator in the synchromesh mechanism. 43, and the low-pressure circuit 50 includes at least one of the torque converter 51, the lubricating circuit 52, and the cooling circuit 53 that the automatic transmission 1 has. That is, the high-pressure circuit 40 is provided with a clutch hydraulic circuit 41 and a brake hydraulic circuit 42 that require high-pressure hydraulic oil, and the low-pressure circuit 50 is supplied with relatively low-pressure hydraulic oil. A sufficient lubricating circuit 52 and cooling circuit 53 are provided.

  According to this configuration, high-pressure hydraulic oil supplied to the clutch hydraulic circuit 41, the brake hydraulic circuit 42, and the synchromesh mechanism shift actuator hydraulic circuit 43 included in the high-pressure circuit 40; The low-pressure hydraulic oil supplied to the torque converter 51, the lubricating circuit 52, or the cooling circuit 53 included in the low-pressure circuit 50 is not mixed. Therefore, for example, there is no possibility that hydraulic oil that has become high temperature in the low-pressure circuit 50 due to a stall of the torque converter 51 or the like is introduced into the high-voltage circuit 40, so that the amount of hydraulic oil leakage in the high-voltage circuit 40 is suppressed to be small. Can do. Thereby, since the size of the vane pump 30 can be reduced, the surplus discharge amount can be suppressed to be small in normal use, and the pump work can be reduced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, the configuration of the automatic transmission 1 shown in FIG. 2 is an example, and the first oil reservoir and the second oil reservoir according to the present invention are configurations other than the first oil tank 21 and the second oil tank 22 shown in FIG. It is good. Moreover, the specific example of the hydraulic pressure supply destination provided in the high voltage circuit 40 and the low voltage circuit 50 shown in the above embodiment is an example, and a mechanism other than that shown in the above embodiment is operated in the high pressure hydraulic circuit according to the present invention. Therefore, the low-pressure hydraulic circuit may include a supply destination of hydraulic oil for lubrication or cooling other than that shown in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Automatic transmission 2 Casing 3 Gear mechanism 5 Machine room 6 Control body 7 Separate plate 10 Hydraulic oil supply apparatus 21 1st oil tank (1st oil sump)
22 Second oil tank (second oil reservoir)
23 High-pressure regulating valve 24 Low-pressure regulating valve 30 Vane pump 31 Rotor 31a Rotating shaft 33 to 38 Oil passage 40 High-pressure circuit (high-pressure hydraulic circuit)
41 Clutch actuation hydraulic circuit 42 Braking actuation hydraulic circuit 43 Shift actuator actuation hydraulic circuit in the synchromesh mechanism 50 Low pressure circuit (low pressure system hydraulic circuit)
51 Torque Converter 52 Lubrication Circuit 53 Cooling Circuit P1 First Suction Port P2 Second Suction Port Q1 First Discharge Port Q2 Second Discharge Port

Claims (2)

A hydraulic fluid supply device for supplying hydraulic fluid to a hydraulic circuit provided in a transmission,
The first and second suction ports and the first and second discharge ports are provided, and the hydraulic oil sucked from the first suction port is discharged from the first discharge port while the rotor makes one rotation, and the second A vane pump that discharges hydraulic oil sucked from the suction port from the second discharge port;
A first oil sump communicating with the first suction port; a second oil sump communicating with the second suction port;
A high-pressure regulating valve that regulates the hydraulic oil discharged from the first discharge port to a high pressure, and a high-pressure hydraulic circuit that is supplied with the hydraulic oil regulated by the high-pressure regulating valve;
A low-pressure regulating valve that regulates the hydraulic oil discharged from the second discharge port to a low pressure, and a low-pressure hydraulic circuit that is supplied with the hydraulic oil regulated by the low-pressure regulating valve,
The hydraulic oil in the first oil reservoir that reaches the high-pressure hydraulic circuit through the first suction port and the first discharge port, and the low-pressure system through the second suction port and the second discharge port. A hydraulic oil supply device characterized in that the hydraulic oil in the second oil reservoir reaching the hydraulic circuit is circulated in a separate system without being mixed. The high-pressure hydraulic circuit includes at least one of a clutch hydraulic circuit, a brake hydraulic circuit, and a shift actuator hydraulic circuit in the synchromesh mechanism of the transmission,
2. The operation according to claim 1, wherein the low-pressure hydraulic circuit includes at least one of a torque converter included in the transmission, a lubrication circuit, or a cooling circuit included in the transmission. Oil supply device.

Images