JP6288849B2 - Hydraulic circuit for vehicles - Google Patents

Description

  The present invention relates to a vehicle hydraulic circuit.

2. Description of the Related Art Conventionally, a vehicular hydraulic circuit for supplying oil to a hydraulic device (driven body) such as a mission mounted on a vehicle is known.
In recent years, an increasing number of vehicles have a so-called idle stop function that temporarily turns off the engine when the vehicle is temporarily stopped in order to improve the quietness and fuel consumption of the vehicle.
As a vehicle hydraulic circuit mounted on a vehicle having such an idle stop function, a mechanical pump that is driven by an engine of the vehicle and supplies oil to the hydraulic device, and a mechanical pump when the engine is stopped And an electric pump for supplying oil to the hydraulic device.

  The electric pump sucks oil stored in an oil tank (also referred to as an oil sump) through a suction oil passage and a suction chamber directly communicating with the pump, and through a discharge chamber and a discharge oil passage directly communicated with the pump. It discharges toward the hydraulic device. In addition, the electric pump is provided with a relief valve so that the pressure of oil discharged from the discharge port (also referred to as a discharge oil passage) does not become higher than a predetermined value. The oil discharged from the relief valve is returned to the suction port (also referred to as a suction oil passage), flows again into the pump chamber, and is discharged from the discharge port (see, for example, Patent Document 1).

JP-A-11-287316

  By the way, in the above-described prior art, for example, when air is mixed in the oil stored in the oil sump, the air is sucked into the suction port by buoyancy when the electric pump is not operated (during mechanical pump operation). Or it may rise near the suction chamber and accumulate. When a predetermined amount of air is mixed into the suction port or the suction chamber, first, air enters the pump at the start of driving of the electric pump. Then, the pumping action of the electric pump is weakened, and it may take time for the pressure of the oil supplied from the discharge port to the hydraulic device to increase to a predetermined pressure, or the electric pump may not be able to discharge the oil itself. For this reason, there exists a subject that the operation | movement reliability of an electric pump will fall. When such a vehicle hydraulic circuit is applied to a vehicle mission device, even if the accelerator pedal is depressed when restarting the engine, the specified hydraulic pressure does not act in the mission, so the vehicle actually turns to acceleration. There was a problem that a time difference occurred until the driver felt uncomfortable.

  Therefore, the present invention has been made in view of the above-described circumstances, and it is possible for a vehicle that can quickly increase the oil discharge pressure, reliably discharge the oil, and improve the operation reliability. Provide a hydraulic circuit.

In order to solve the above-described problems, a vehicle hydraulic circuit according to the present invention includes an oil tank, a driven body to which oil in the oil tank is supplied, and a pump that sucks the oil and discharges the oil to the driven body. A suction oil passage that allows the oil to flow between the oil tank and the pump, and a discharge oil passage that allows the oil to flow between the pump and the driven body. An air stop for storing air is formed in at least a part of the intake oil passage, and the pump includes a pump body that sucks and discharges oil, a drive unit that drives the pump body, A bracket for fixing the pump main body to the driven body side, the air stop portion being formed, and the bracket penetrating in the axial direction of the pump and having an opening on the driven body side. By opening of the pump side the suction oil passage is formed such that the gravity direction lower side, at least a portion of the gravity direction over the inlet fluid passage, the air stop for accumulating air It is formed.

With this configuration, even if air is accumulated in the intake oil passage, air can be accumulated in the air stop portion, so that the pressure of the oil supplied to the hydraulic device is quickly increased after the electric pump is started. be able to.
Further, the air present in the suction oil passage can be sufficiently accumulated in the air stop portion.

  The air stop according to the present invention may be formed in part of the suction oil passage by an oil passage directed upward in the gravity direction from the pump.

  With this configuration, the vehicular hydraulic circuit according to the present invention can store only the oil in the vicinity of the pump, and the air existing in the air stop portion is prevented from flowing directly into the pump.

The air stop according to the present invention may be formed by a space that is different from the flow direction of the oil and extends upward.
With this configuration, the vehicle hydraulic circuit according to the present invention can sufficiently accumulate the air present in the intake oil passage in the air stop portion.

  The pump according to the present invention includes a pump body, a pump case, a pump chamber provided in the pump case, an outer rotor rotatably disposed in the pump chamber, and a rotation shaft of the motor unit. A trochoidal pump having an inner rotor that forms a working chamber that sucks the oil and discharges the oil in cooperation with the outer rotor.

  Here, when a trochoid pump that discharges oil by changing the volume of the pump operating chamber is used as a pump for pumping oil, performance tends to vary depending on foreign matters (air or the like) mixed in the oil. However, the operation reliability of the electric pump can be improved by configuring as described above.

The discharge oil passage according to the present invention is preferably provided with a relief means for reducing the oil pressure when the oil pressure in the discharge oil passage exceeds a set value.
By comprising in this way, it becomes unnecessary to provide a suction | inhalation oil path, a discharge oil path, and a relief means separately, respectively, and it can integrate. For this reason, the number of parts can be reduced, the manufacturing cost can be reduced, and the assembly property of the electric pump can be improved.

The relief means according to the present invention may reflow the oil in the discharge oil passage into the suction oil passage.
By comprising in this way, while being able to simplify the structure of a return means, it can reduce in size.

  The vehicle hydraulic circuit according to the present invention can keep the air that has entered the intake oil passage in the air stop portion, and therefore can quickly increase the pressure of the oil supplied to the driven portion after the electric pump is started. . Therefore, the present invention can quickly increase the oil discharge pressure by preventing the pump from engaging with air, and can reliably discharge the oil, thereby improving the operation reliability of the electric pump. it can.

1 is a schematic configuration diagram of a vehicle hydraulic circuit in an embodiment of the present invention. It is the front view which looked at the bracket in embodiment of this invention from the pump main body side. It is the rear view which looked at the bracket in embodiment of this invention from the connection member side. It is a perspective sectional view in the BB line of FIG. It is a modification of the hydraulic circuit for vehicles in the embodiment of the present invention. It is a one part modification of the hydraulic circuit for vehicles in embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

(Vehicle hydraulic circuit)
FIG. 1 is a schematic configuration diagram of a vehicle hydraulic circuit 1.
As shown in FIG. 1, a vehicle hydraulic circuit 1 includes a mission 3 as a driven part mounted on a vehicle, an oil tank 4, and a machine for supplying oil stored in the oil tank 4 to the mission 3. The oil pump 5 and the electric pump 6 and the oil passages connecting them are the main components.
In the present embodiment, the connection member 2 is interposed between the mission 3 and the electric pump 6.

  The mechanical pump 5 is connected to an engine (drive unit) (not shown), and is driven using the driving force of the engine. Normally, the vehicle hydraulic circuit 1 uses the mechanical pump 5 as a main pump, and drives the electric pump 6 in place of the mechanical pump 5 when the engine is stopped to supply oil to the mission 3.

The vehicle hydraulic circuit 1 includes a first suction oil passage 7 that connects the mechanical pump 5 and the oil tank 4, a first discharge oil passage 8 that connects the mechanical pump 5 and the mission 3, and a mission. A first return oil passage (also referred to as a system return oil passage) 9 that connects the oil tank 3 and the oil tank 4 is formed.
When the mechanical pump 5 is driven, oil is sucked into the mechanical pump 5 from the oil tank 4 via the first suction oil passage 7, and this oil is pumped to the transmission 3 via the first discharge oil passage 8. The The oil used in the mission 3 is returned to the oil tank 4 through the first return oil passage 9.

The connection member 2 includes a second suction oil passage 10 that connects the electric pump 6 and the oil tank 4, and a second discharge oil passage 11 that connects the electric pump 6 and the first discharge oil passage 8. Yes.
When the mechanical pump 5 is stopped and the electric pump 6 is driven, oil is sucked from the oil tank 4 into the pump chamber 24 (to be described later) of the electric pump 6 through the second suction oil passage 10, and this oil is second The oil is pumped to the mission 3 through the discharge oil passage 11 and the first discharge oil passage 8.

In addition, a check valve 13 is provided in the middle of the second discharge oil passage 11 of the connection member 2, and when the mechanical pump 5 is driven, the oil pumped from the mechanical pump 5 is discharged into the second discharge passage. The oil passage 11 is prevented from flowing backward. Further, the hydraulic pressure applied by the mechanical pump 5 is set higher than the hydraulic pressure by the electric pump 6, and the check valve 13 is opened even if the electric pump 6 is operated while the mechanical pump 5 is operating. Rather, a prescribed hydraulic pressure is applied to the mission 3.
Further, when the pressure of the oil in the second discharge oil passage 11 becomes a predetermined value or more, a relief valve 42 described later releases the oil through the second return oil passage 12 in order to release the pressure. The second suction oil passage 10 is returned.

(Electric pump)
The electric pump 6 includes a motor unit (drive unit) 14 and a pump unit 15 connected to the motor unit 14 and arranged coaxially with the motor unit 14.
The motor unit 14 includes, for example, a motor case 16 formed of resin, a stator 17 fixed in the motor case 16 by insert molding, and a rotor 18 rotatably provided on the radially inner side of the stator 17. This is a so-called brushless motor. By supplying power from an external power source (for example, a battery) to the motor unit 14, the rotor 18 rotates. The rotating shaft 19 of the rotor 18 protrudes into the pump unit 15 and is connected to the pump unit 15.

The pump unit 15 is disposed on the motor unit 14 side, is disposed on the pump body 21 that sucks and discharges oil, and is disposed on the side opposite to the motor unit 14 of the pump body 21, and electrically operates the connection member 2 (driven unit side). A bracket 22 for fixing the pump 6.
The pump main body 21 has a pump case 23 fixed so as to be sandwiched between the motor unit 14 and the bracket 22. The pump case 23 is formed by, for example, aluminum die casting. A substantially cylindrical pump chamber 24 is formed in the pump case 23, and a substantially ring-shaped outer rotor 25 is rotatably provided therein.

Further, an inner rotor 26 is rotatably provided inside the outer rotor 25 in a radial direction in an eccentric state. One end of the rotating shaft 19 of the motor unit 14 is fixed to the inner rotor 26.
The outer rotor 25 and the inner rotor 26 constitute a so-called trochoid pump. In other words, by changing the volume of the space formed by the inner teeth (not shown) of the outer rotor 25 and the outer teeth (not shown) of the inner rotor 26, the working chamber 27 for sucking oil and discharging the sucked oil is formed. Yes. In the working chamber 27, spaces surrounded by the pump case 23, the outer rotor 25, the inner rotor 26, and the bracket 22 are configured as volume change chambers 27a and 27b.

2 is a front view of the bracket 22 as viewed from the pump body 21 side, FIG. 3 is a rear view of the bracket 22 as viewed from the connecting member 2 side, and FIG. 4 is a perspective cross-sectional view taken along the line BB in FIG. FIG. Hereafter, the detailed structure of the principal part of this invention is demonstrated using FIGS.
As shown in FIGS. 2 and 3, the bracket 22 is formed with a predetermined thickness by being surrounded by flat end faces 22a and 22b and side faces 22c-22g by, for example, aluminum die casting. The end surface 22 a is formed so as to be able to be joined to the end surface 23 a of the pump case 23 shown in FIG. 1, and the end surface 22 b is formed so as to be able to be joined to the connecting member 2.
In the present embodiment, the pump body 21 and the bracket 22 shown in FIG. 1 are integrated.
The bracket 22 integrated with the pump main body 21 is joined to the connecting member 2 in such a posture that the side surface 22e faces substantially downward and the bottom surface is set, and the end surfaces 22a and 22b are raised.

An end face 23 a of the pump case 23 is provided with an O-ring (not shown) for ensuring a sealing property between the pump case 23 and the bracket 22.
In the following description, in the bracket 22, the end surface 22a on the pump case 23 side is referred to as a pump case side end surface 22a, and the end surface 22b opposite to the pump case side end surface 22a is referred to as a connection member side end surface 22b. To do.

  On the outer peripheral portion of the bracket 22, two female screw portions 32 for fastening and fixing the bracket 22, the pump case 23 and the motor case 16 shown in FIG. 1 with bolts (not shown) are formed. The female screw portion 32 is formed so as to penetrate the bracket 22 in the thickness direction.

  Further, three bolt seats 33 (a first bolt seat 33a, a second bolt seat 33b, and a third bolt seat) for fastening and fixing the bracket 22 to the connection member 2 with bolts (not shown) are provided on the outer periphery of the bracket 22. 33c) are formed in three places at substantially equal intervals in the circumferential direction. Each bolt seat 33 is formed with an insertion hole 33d through which a bolt (not shown) can be inserted.

2-4, the pump case side end surface 22a of the bracket 22 receives one end of the rotating shaft 19 at a location corresponding to the rotating shaft 19 (see FIG. 1, the same applies hereinafter) of the motor unit 14. A recess 31 is formed. When one end of the rotating shaft 19 comes into contact with the recess 31, the swing of the rotating shaft 19 can be suppressed.
Further, the bracket 22 is formed with a third suction oil passage 28 and a third discharge oil passage 29 at locations corresponding to the pump chamber 24 of the pump case 23 shown in FIG.

  Specifically, the third suction oil passage 28 includes a suction port 28a formed in a round hole shape penetrating the bracket 22 in the thickness direction from the connection member side end surface 22b side to the pump case side end surface 22a, and a pump case side end surface. The first passage 28b is formed in a groove shape on the 22a side and extends substantially perpendicularly (that is, vertically downward) toward the side surface 22e, and is formed in a groove shape continuous to the first passage 28b. And a second passage 28c extending in a substantially C shape in plan view downward.

The suction port 28a has a volume capable of storing a predetermined amount (specifically, about 1 cc) of air, and is located above the volume change chamber 27a in the working chamber 27 shown in FIG.
The first passage 28b is partly communicated with the suction port 28a (in front view of the pump case side end surface 22a) and is formed vertically downward from the suction port 28a. It is designed to flow down in the direction of gravity according to the shape.
Thereafter, the second passage 28 c communicates with the first passage 28 b and extends along the concave portion 31 while curving downward.
A volume change chamber 27a (introduction port) on one side in the working chamber 27 of the pump main body 21 shown in FIG. 1 is disposed so as to communicate with the second passage 28c.

  With the above configuration, the suction port 28 a and the first passage 28 b form an air stop portion R that prevents air from entering the working chamber 27 of the pump body 21. That is, the air stop portion R is a case where the air mixed in the oil tank 4 reaches the suction port 28a of the bracket 22 through the second suction oil passage 10 while the electric pump is not operating. By keeping the air in the vicinity of the suction port 28a and preventing the air from flowing down through the first passage 28b, substantially only oil is placed between the second passage 28c and a volume change chamber 27a (to be described later) of the working chamber 27 (that is, in the vicinity of the pump). It has a structure to store.

  The first passage 28b and the second passage 28c are open on the pump case side end surface 22a side in the bracket 22 alone, but this opening overlaps the pump case side end surface 22a and the end surface 23a of the pump case 23. As a result, the third suction oil passage 28 through which the oil flows is blocked.

  The third discharge oil passage 29 has a suction port 29a formed in a round hole penetrating in the direction between the pump case side end surface 22a and the connection member side end surface 22b, and a part of the third discharge oil passage 29 communicates with the suction port 29a. The first passage 29b is formed in a groove shape on the case side end face 22a side, and the second passage 29c is formed in a groove shape that is continuous with the first passage 29b.

  The second passage 29c is formed in a substantially C-shape extending downward so as to be substantially point-symmetric about the shape of the second passage 28c of the third intake oil passage 28 and the recess 31. Further, the second passage 29c communicates with the one side volume change chamber 27a in the working chamber 27 of the pump body 21 shown in FIG. 1 and the other side volume change chamber 27b (outlet) set at the point target position. Is arranged.

As shown in FIG. 4, the bracket 22 communicates with the second passage 29b of the third discharge oil passage 29 and faces the side surface 22c between the first bolt seat 33a and the second bolt seat 33c shown in FIG. A relief hole 34 that extends obliquely upward and opens at the side surface 22c with the axis L as the center is formed.
The relief hole 34 is formed on the side of the second passage 29b and the large diameter portion 34a formed so that the diameter of the inner peripheral surface on the side 22c side is larger than that of the inner peripheral surface on the back side, that is, the second passage 29b. The small diameter portion 34b is formed.

The bracket 22 is formed with a communication hole 35 that opens on the small diameter portion 34b side of the wall portion forming the large diameter portion 34a.
The communication hole 35 communicates with the second return oil passage 12 shown in FIG.
As shown in FIG. 2, a coil spring 39 and a valve body 38 are accommodated in the relief hole 34 in order from the second passage 29 b side. A female screw portion 40 is engraved on the inner peripheral surface of the large diameter portion 34a, and a cap bolt 41 is screwed into this with a washer (not shown) interposed therebetween.

  By screwing the cap bolt 41, the coil spring 39 is slightly compressed and deformed, and the pressing force toward the small diameter portion 34b is urged to the valve body 38. The valve body 38 is in contact with a stepped portion 34c that is normally formed between the large diameter portion 34a and the small diameter portion 34b by a coil spring 39. In a state where the valve body 38 is in contact with the stepped portion 34 c, the second communication hole 35 is closed by the valve body 38. The spring force of the coil spring 39 is such that when the pressure of the oil flowing through the third discharge oil passage 29 becomes higher than a predetermined value, the valve body 38 slides against the spring force, and the second communication hole The force is set such that 35 is opened and the oil pressure is released.

  Thereby, when the pressure of the oil flowing through the third discharge oil passage 29 becomes higher than a predetermined value, the oil in the third discharge oil passage 29 is shown through the relief hole 34 and the communication hole 35 shown in FIG. 1 to the second return oil passage 12 shown in FIG. That is, the relief hole 34, the valve body 38, the coil spring 39, the communication hole 35, and the cap bolt 41 function as a relief valve 42 for reducing the excess pressure of the oil flowing through the third discharge oil passage 29.

  As shown in FIG. 1, the bracket 22 configured in this way is attached to the connection member 2 with the side surface 22e as a bottom surface, and the suction of the second suction oil passage 10 and the third suction oil passage 28 of the connection member 2 is performed. The inlet 28 a is disposed substantially on the same axis, and the second intake oil passage 10 and the inlet 28 a are connected via the intake side joint pipe 43.

  Further, the second discharge oil passage 11 of the connecting member 2 and the first passage 29b of the third discharge oil passage 29 are arranged substantially coaxially, and the second discharge oil passage 11 and the first passage 29b are connected to the discharge side joint. They are connected via a pipe 44. O-rings 45a and 45b are attached to both end sides in the axial direction of the joint pipes 43 and 44, respectively, and the sealability of the connection portion between the second suction oil passage 10 and the suction port 28a of the third suction oil passage 28 is provided. And the sealing performance of the connection location of the 2nd discharge oil path 11 and the 1st channel | path 29b of the 3rd discharge oil path 29 is secured.

  The connecting member side end face 22b of the bracket 22 is provided with an O-ring 51 in the annular groove 50 in order to ensure a sealing property between the bracket 22 and the connecting member 2, and is discharged from the communication hole 35. The oil that has been discharged does not flow outside.

(Operation of vehicle hydraulic circuit)
Next, the operation of the vehicle hydraulic circuit 1 will be described with reference to FIGS.
As shown in the figure, when driving the mission 3 of the vehicle, the mechanical pump 5 operates while the engine (not shown) is driven. That is, the power of the engine is transmitted to the mechanical pump 5 to drive the mechanical pump 5, and oil is sucked from the oil tank 4 through the first suction oil passage 7. The oil sucked into the mechanical pump 5 is pumped to the mission 3 through the first discharge oil passage 8. The oil used in the mission 3 is returned to the oil tank 4 through the first return oil passage 9.

  The electric pump 6 is set so as not to operate during the operation of the mechanical pump 5. However, when air is mixed in the oil tank 4, the air is transferred from the oil tank 4 to the second intake oil passage 10 by buoyancy. May move up. However, in the present invention, only the oil can be stored between the second passage 28c and the working chamber 27 by keeping the air in the vicinity of the suction port 28a (air stop portion R). Therefore, when the electric pump 6 is started, it becomes possible to prepare for sending the desired hydraulic pressure by quickly shifting the electric pump 6 to the standby state by the stored oil, and the pressure of the oil supplied to the mission 3 without delay. Can be increased. Further, the air accumulated in the air stop R during the standby state can be discharged smoothly.

  On the other hand, for example, when the engine is temporarily stopped due to idle stop or the like, the electric pump 6 is used to supply oil to the transmission 3. In this case, when electric power is supplied from a battery or the like (not shown) and the motor unit 14 is driven, the inner rotor 26 and the outer rotor 25 of the pump body 21 connected to the rotating shaft 19 of the motor unit 14 rotate. Then, the oil in the oil tank 4 is supplied to the pump body 21 via the second suction oil passage 10 and the third suction oil passage 28 in the bracket 22.

  At this time, even if air has entered the second suction oil passage 10, the air in the suction oil passage 10 and the oil can be retained near the suction port 28 a by the air stop R and enter the pump body 21. Be blocked. Since only the oil is stored between the second passage 28 c and the working chamber 27, air does not reach the working chamber 27.

Thereafter, the oil is pumped from the pump body 21 to the third discharge oil passage 29 and the second discharge oil passage 11, and the check valve 13 is opened by the oil pressure, and the oil is supplied to the transmission 3 through the first discharge oil passage 8. Is pumped.
The oil used in the mission 3 is returned to the oil tank 4 through the first return oil passage 9 in the same manner as when the mechanical pump 5 is driven.

  Here, the hydraulic pressure from the mechanical pump 5 remains in the first discharge oil passage 8, and the pressure of the oil flowing through the third discharge oil passage 29 without opening the check valve 13 increases to a predetermined value or more. In this case, the relief valve 42 is actuated, and the oil in the third discharge oil passage 29 is guided to the second intake oil passage 10 through the relief valve 42 and the second return oil passage 12 and sucked into the electric pump 6 again. .

With this configuration, oil can be prevented from entering the pump main body 21 by the air stop portion R, and the air in the oil can be removed as much as possible, so that the vehicle hydraulic circuit 1 can be made compact. can get.
Note that the oil may be returned to the first return oil passage 9 via the second return oil passage 12 by the relief valve 42 as shown in FIG.

As in the above-described embodiment, the bracket 22 is formed with the suction port 28a and the first passage 28b (air stop portion R) as the third suction oil passage 28, so that the vehicle hydraulic circuit 1 supplies air. It is possible to prevent the air from entering the pump body 21 by staying in the vicinity of the suction port 28a.
For this reason, even if air is mixed in the suction oil passage 10, the vehicle hydraulic circuit 1 suppresses the pump main body 21 from directly sucking air to quickly increase the oil discharge pressure, thereby reliably The effect that it can be made to discharge is produced. Therefore, the vehicle hydraulic circuit 1 has an effect that the operational reliability of the electric pump 6 can be improved with certainty.

  Further, since the third suction oil passage 28, the third discharge oil passage 29, and the relief valve 42 are integrally provided in the bracket 22, the vehicular hydraulic circuit 1 includes the third suction oil passage 28, the third discharge oil passage 28, and the third discharge oil passage 28. Compared to the case where the oil passage 29 and the relief valve 42 are provided separately, the number of parts can be reduced. For this reason, the hydraulic circuit 1 for vehicles has the effect that the assembling property of the electric pump 6 can be improved while the manufacturing cost can be reduced.

  Further, the vehicle hydraulic circuit 1 has a relief hole 34 and a communication hole 35 formed in the bracket 22, and a valve body 38 and a coil spring 39 are accommodated in the relief hole 34, and the valve body 38 and the coil spring 39 are connected by a cap bolt 41. The escape from the relief hole 34 can be prevented. Since the relief hole 34, the communication hole 35, the valve body 38, the coil spring 39, and the cap bolt 41 function as the relief valve 42, the vehicle hydraulic circuit 1 can simplify the configuration of the relief valve 42 and be small. There is an effect that can be made.

  Moreover, even if the hydraulic circuit 1 for vehicles is a case where the pump part 15 is what is called a trochoid type pump, it can suppress the fall of pump performance at the time of foreign materials, such as air, mixing in oil, and the operation | movement reliability is improved. There is an effect that it can be improved.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
Specifically, the air stop portion R of the above embodiment is formed by the suction port 28a and the first passage 28b. However, as shown in FIG. 5, a pipe or the like is formed in the connecting member 2 in a crank shape. Therefore, one or a plurality of locations of the second suction oil passage 10 may be directed in the vertical direction.

Further, as shown in the figure, the third discharge oil passage 29 or the second discharge oil passage 11 (in this figure, the third discharge oil passage 29) may have a stepped portion 50 formed therein. In this case, the step portion 50 has a structure in which at least a part of the third discharge oil passage 29 and the discharge oil passage 11 is lowered toward the pump body 21, in other words, the oil is raised in the oil flow direction.
With this configuration, even if part of the air enters the pump body 21 and is discharged from the pump body 21, the stepped portion 50 raises the air together with the oil and quickly discharges it from the pump body 21. be able to.

Further, as shown in FIG. 6, the air stop portion R has a direction different from the oil flowing direction in a part or a plurality of portions of at least one of the second suction oil passage 10 and the third suction oil passage 28. It may be formed by a space widened upward (may be obliquely upward).
With such a configuration, it is possible to prevent the air in the second suction oil passage 10 and the third suction oil passage 28 from being stored in the air stop portion R and entering the pump main body 21.

The air stop R formed by an oil passage directed downward in the direction of gravity toward the pump and a space different from the flow direction of the oil and expanded upward (may be obliquely upward). The formed air stop portions R may be appropriately combined.
In addition, the air stop part R should just be formed in the shape and volume which do not move the air which stopped | fastened to the pump main body 21 direction, even when a vehicle inclines on a slope.

In the above-described embodiment, the case where the bracket 22 is integrally provided with the third suction oil passage 28, the third discharge oil passage 29, and the relief valve 42 has been described. However, the present invention is not limited to this. As long as the third suction oil passage 28 and the third discharge oil passage 29 are respectively connected to separate oil passages, the third suction oil passage 28, the third discharge oil passage 29, The relief valves 42 may be provided separately.
Further, the relief valve 42 may be replaced with a commercially available one, and only the relief valve 42 may be separated from the bracket 22.

DESCRIPTION OF SYMBOLS 1 ... Vehicle hydraulic circuit 3 ... Mission (driven part)
4 ... Oil tank 5 ... Mechanical pump (pump)
6 ... Electric pump (pump)
7: First suction oil passage (oil passage)
8. First discharge oil passage (oil passage)
9: First return oil passage (oil passage)
DESCRIPTION OF SYMBOLS 10 ... 2nd intake oil path 11 ... 2nd discharge oil path 14 ... Motor part 15 ... Pump part 21 ... Pump main body 22 ... Bracket 25 ... Outer rotor 26 ... Inner rotor 27 ... Working chamber 28 ... 3rd intake oil path 28a ... Inlet 28b ... 1st channel | path 28c ... 2nd channel | path 29 ... 3rd discharge oil path 29b ... 1st channel | path (discharge port)
34 ... Relief hole 50 ... Step R ... Air stop

Claims (6)

An oil tank; a driven body to which oil in the oil tank is supplied; and a pump that sucks the oil and discharges the oil to the driven body, and passes the oil between the oil tank and the pump. A suction oil passage is formed, and a discharge oil passage is formed between the pump and the driven body to flow the oil,
At least a part of the suction oil passage is formed with an air stop for accumulating air ,
The pump includes a pump main body that sucks and discharges oil, a drive unit that drives the pump main body, and a bracket that is formed with the air stop portion and fixes the pump main body to the driven body side,
In the bracket, the suction oil passage is formed so as to penetrate in the axial direction of the pump and so that the opening on the pump side is lower than the opening on the driven body side in the gravity direction. An automotive hydraulic circuit, wherein an air stop for accumulating air is formed in at least a part of an upper portion in the gravity direction in the suction oil passage .   2. The vehicle hydraulic circuit according to claim 1, wherein the air stop portion is formed by an oil passage directed upward in a gravitational direction from the pump in a part of the suction oil passage.   3. The vehicle hydraulic circuit according to claim 1, wherein the air stop portion is formed by a space that is different from an oil flow direction and extends upward. 4. The vehicle hydraulic circuit includes a motor unit for driving the pump,
The pump is
The pump body;
A pump case,
A pump chamber provided in the pump case;
An outer rotor disposed rotatably in the pump chamber;
A trochoid pump having an inner rotor that rotates integrally with a rotation shaft of the motor unit and forms an operation chamber that sucks the oil and discharges the oil in cooperation with the outer rotor. Item 4. The vehicle hydraulic circuit according to any one of Items 1 to 3 . 2. A relief means for reducing the pressure of the oil when the pressure of the oil in the discharge oil path becomes equal to or higher than a set value. The vehicle hydraulic circuit according to any one of claims 1 to 4 . 6. The vehicular hydraulic circuit according to claim 5 , wherein the relief means reflows the oil in the discharge oil passage into the intake oil passage.

Images