CN110366639B

CN110366639B - Pump device

Info

Publication number: CN110366639B
Application number: CN201880013365.4A
Authority: CN
Inventors: 兼田谕志
Original assignee: Mikuni Corp
Current assignee: Mikuni Corp
Priority date: 2017-02-28
Filing date: 2018-01-29
Publication date: 2021-05-04
Anticipated expiration: 2038-01-29
Also published as: JP2018141400A; DE112018001037T5; DE112018001037B4; JP6753800B2; CN110366639A; WO2018159178A1

Abstract

The pump device of the present invention comprises: a main body (10) including a pump housing chamber (11), a suction passage (12), a discharge passage (13), a first passage (14), a second passage (15), a first connecting passage (16), and a second communicating passage (17); a pump unit (20) housed in the pump housing chamber and rotating around a predetermined axis (S); a first suction check valve (30) and a first discharge check valve (40) disposed in the first passage; a second suction check valve (50) and a second discharge check valve (60) disposed in the second passage; the first channel (14) and the second channel (15) are formed in a straight line on both sides across the pump housing chamber (11). This can simplify the structure, reduce the size, and reduce the cost.

Description

Pump device

Technical Field

The present invention relates to a displacement type pump device for sucking and discharging fluid during forward rotation and reverse rotation, and more particularly, to a pump device for sucking and discharging oil for cooling or lubrication purposes such as an Electric Vehicle (EV) motor or a Hybrid Electric Vehicle (HEV) motor.

Background

As a conventional pump device, a rotary electric machine cooling pump is known which includes a pump main body, a port component, a cover (cover), a trochoid pump (trochoid pump) housed in the pump main body, various passages formed in the port component, four check valves housed in four check valve housing holes formed in the port component, respectively, and the like (for example, see patent document 1).

However, in the pump device, the pump body, the port member stacked on the pump body, and the cover stacked on the port member are included as a main body, and therefore, the pump device has a structure in which the number of components is large and the size is increased in the stacking direction.

Further, since the port component is formed with various channels that are curved in a plurality of directions and connected to each other, the shape of the channel is complicated, and operations such as manufacturing a die and machining may become troublesome.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-94885

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a pump device which can solve the problems of the conventional art and can achieve simplification, downsizing, and the like of the structure.

Means for solving the problems

The pump device of the present invention is formed as follows: it includes: a main body including a pump receiving chamber, a suction passage, a discharge passage, a first passage connecting the suction passage and the discharge passage, a second passage connecting the suction passage and the discharge passage, the first passage communicating the first passage with a first port of the pump receiving chamber, a first communicating passage communicating the second passage with a second port of the pump receiving chamber; a positive displacement pump unit housed in the pump housing chamber and rotating around a predetermined axis; a first suction check valve and a first discharge check valve disposed in the first passage; and a second suction check valve and a second discharge check valve disposed in the second passage; the first channel and the second channel are formed linearly on both sides across the pump accommodation chamber.

In the above configuration, the following configuration may be adopted: the main body includes a third passage connecting the suction passage and the discharge passage, and the pump device further includes a relief valve disposed in the third passage.

In the above configuration, the following configuration may be adopted: the body includes a joint surface to be joined to the application object, the pump housing chamber is formed with an opening in the joint surface in the direction of the axis, the suction passage, the discharge passage, the first communicating passage and the second communicating passage are formed as grooved passages, the grooved passages are formed with openings in the joint surface, the first passage and the second passage are formed as linear orifice passages, and the orifice passages are parallel to the joint surface and are formed with openings in the same side surface of the body.

In the above configuration, the following configuration may be adopted: the main body includes a third passage connected to the suction passage and the discharge passage, and the pump device further includes a relief valve disposed in the third passage, the third passage is formed as a linear orifice passage, the orifice passage is parallel to the joint surface, and an opening is formed in one side surface of the main body.

In the above configuration, the following configuration may be adopted: the first, second, and third channels are formed parallel to each other, and openings are formed at the same side of the body.

In the above configuration, the following configuration may be adopted: the first port and the second port are formed so as to open onto a thrust surface (thrust) of a pump housing chamber that supports the pump unit in the axial direction.

In the above configuration, the following configuration may be adopted: the suction passage and the discharge passage are disposed on both sides of the pump accommodating chamber so as to be orthogonal to the first passage and the second passage.

In the above configuration, the following configuration may be adopted: the first passageway includes first big footpath passageway and first path passageway, the first check valve of inhaling of first big footpath passageway embedding, the first discharge check valve of first path passageway embedding, the second passageway includes big footpath passageway of second and second path passageway, the big footpath passageway of second embedding second inhales the check valve, second path passageway embedding second discharge check valve.

In the above configuration, the following configuration may be adopted: the first suction check valve includes: a first suction sheet member fitted to the first large-diameter passage; a first suction valve body capable of being seated on the first suction sheet member; and a first suction urging spring that urges the first suction valve body toward the first suction sheet member; the first discharge check valve includes: a first discharge sheet member fitted into the first small-diameter passage; a first discharge valve body capable of being seated on the first discharge sheet member; and a first discharge urging spring that urges the first discharge valve body toward the first discharge sheet member; the second suction check valve includes: a second suction sheet member fitted to the second large-diameter passage; a second suction valve body capable of being seated on the second suction sheet member; and a second suction urging spring that urges the second suction valve body toward the second suction sheet member; and the second discharge check valve includes: a second discharge sheet member fitted into the second small-diameter passage; a second discharge valve body capable of being seated on the second discharge sheet member; and a second discharge biasing spring biasing the second discharge valve body toward the second discharge sheet member.

In the above configuration, the following configuration may be adopted: the first suction bias spring abuts against the first discharge sheet member, the first discharge bias spring abuts against a part of the main body, the second suction bias spring abuts against the second discharge sheet member, and the second discharge bias spring abuts against a part of the main body.

In the above configuration, the following configuration may be adopted: the pressure relief valve includes: a retreat sheet member fitted to the third channel; a relief valve body capable of being seated on the retraction sheet member; and a retreat urging spring that urges the relief valve body toward the retreat sheet member; and the retreat biasing spring abuts against a plug (plug) that closes the third passage.

In the above configuration, the following configuration may be adopted: the pump unit is an internal gear pump and comprises an inner rotor and an outer rotor.

In the above configuration, the following configuration may be adopted: the main body includes a bearing hole supporting a rotating shaft rotating the inner rotor in a region facing the pump receiving chamber.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the pump device having the above configuration, it is possible to obtain a pump device which can achieve simplification, downsizing, cost reduction, and the like of the structure, and can prevent occurrence of cavitation (cavitation) and the like to ensure desired pump performance.

Drawings

Fig. 1 is an exploded perspective view showing one embodiment of a pump device of the present invention.

Fig. 2 is a schematic view of the pump apparatus shown in fig. 1.

Fig. 3 is a front view of the main body included in the pump device shown in fig. 1, as viewed from the joint surface side.

Fig. 4 is a side view of the main body included in the pump device shown in fig. 1, as viewed from the side perpendicular to the joint surface, in a state where the plug, the four check valves, and the one relief valve are not attached.

Fig. 5 is a sectional view of the pump device shown in fig. 1 cut by a plane parallel to the joint plane.

Fig. 6 is a cross-sectional view of the pump device shown in fig. 1, cut by a plane passing through the center of the suction passage and perpendicular to the joint surface.

Fig. 7 is a cross-sectional view of the pump device shown in fig. 1, cut along a plane passing through the centers of the pump housing chamber, the first communicating path, and the second communicating path and perpendicular to the joint surface.

Fig. 8 is a cross-sectional view of the pump device shown in fig. 1, cut by a plane passing through the center of the discharge passage and perpendicular to the joint surface.

Fig. 9 is a cross-sectional view showing an operation state of check valves (a first suction check valve, a first discharge check valve, a second suction check valve, and a second discharge check valve) when the pump unit is rotated in one direction in the pump device shown in fig. 1.

Fig. 10 is a cross-sectional view showing an operation state of check valves (a first suction check valve, a first discharge check valve, a second suction check valve, and a second discharge check valve) when the pump unit is rotated in the other direction in the pump device shown in fig. 1.

Fig. 11 is a cross-sectional view showing the operation states of the check valves (first intake check valve, first discharge check valve, second intake check valve, and second discharge check valve) and the relief valve when the pump unit is rotated in one direction in the pump device shown in fig. 1.

[ description of symbols ]

S: axial line

10: main body

10 a: joint surface

10 b: side (same side)

11: pump accommodating chamber

11 b: thrust surface

11 c: first port

11 d: second port

12: suction channel

13: discharge channel

13 b: wall (part of main body)

14: first channel

X1: axial line

14 a: first major diameter passage

14 b: first minor diameter passage

15: the second channel

X2: axial line

15 a: second major diameter passage

15 b: second minor diameter passage

16: first connecting channel

17: the second connecting passage

18: third channel

X3: axial line

19: bearing bore

20: pump unit

21: inner rotor

22: external rotor

23: rotating shaft

30: first suction check valve

31: first suction sheet member

32: first suction valve body

33: first suction forcing spring

40: first discharge check valve

41: first discharge sheet member

41 d: end face

42: first discharge valve body

43: first discharge force application spring

50: second suction check valve

51: second suction sheet member

52: second suction valve body

53: second suction force application spring

60: second discharge check valve

61: second discharge sheet member

61 d: end face

62: second discharge valve body

63: second discharge urging spring

70: pressure relief valve

71: retracting sheet member

72: pressure relief valve body

73: retreating force application spring

80: bolt

Detailed Description

An embodiment of the present invention will be described below with reference to fig. 1 to 11 of the drawings. In fig. 1, the axis S is a straight line perpendicular to the joint surface 10a, the axes X1, X2, and X3 are straight lines parallel to each other and to the joint surface 10a, and the center lines Yi, Yo, and Yc of the respective grooved channels are straight lines parallel to each other, to the joint surface 10a, and perpendicular to the axes X1, X2, and X3. Here, the center line Yc is located in the middle of approximately bisecting the center line Yi and the center line Yo.

The pump device according to the above-described embodiment is applied to a lubrication and cooling system for an object to be used, such as an EV motor for an electric vehicle and an HEV motor for a hybrid electric vehicle, as a device for circulating oil as a fluid while pressurizing and supplying the oil.

The pump device includes a body 10, a pump unit 20, a first suction check valve 30, a first discharge check valve 40, a second suction check valve 50, a second discharge check valve 60, a relief valve 70, and three bolts 80.

The pump unit 20 is an internal gear pump, and includes an inner rotor 21, an outer rotor 22, and a rotary shaft 23.

The main body 10 is formed by die casting a material such as an aluminum alloy into a flat plate shape having a predetermined thickness and has a substantially rectangular outer contour.

The main body 10 includes a joint surface 10a, a side surface 10b, four circular holes 10c through which fastening bolts (not shown) are inserted, a pump housing chamber 11, a suction passage 12, a discharge passage 13, a first passage 14, a second passage 15, a first connecting passage 16, a second connecting passage 17, a third passage 18, and a bearing hole 19.

The joining surface 10a is a surface to be joined to a case of an application object such as an EV motor or an HEV motor, and is formed as a flat surface perpendicular to the axis S and smooth by machining after die forming.

The side surface 10b is formed as the same side surface as the opening of the first passage 14, the second passage 15, and the third passage 18, and is formed as a flat surface substantially perpendicular to the joint surface 10 a.

The pump housing chamber 11 is formed by casting a substantially cylindrical recess having an opening formed in the joint surface 10a in a substantially central region of the main body 10, and then forming an inner circumferential surface 11a and a thrust surface 11b defining a predetermined radius by machining.

In the pump chamber 11, a first port 11c and a second port 11d are formed adjacent to the depth side in the direction of the axis S, and the first port 11c and the second port 11d are opened in the thrust surface 11 b.

The pump housing chamber 11 houses the pump unit 20 so as to be flush with the joint surface 10 a. The thrust surface 11b supports one side surfaces of the inner rotor 21 and the outer rotor 22 so as to be rotatable in the direction of the axis S, and the inner peripheral surface 11a supports the outer peripheral surface of the outer rotor 22 so as to be rotatable around the axis S.

The pump housing chamber 11 is closed by a joint surface of an application object except a region through which the rotary shaft 23 passes, and the other side surfaces of the inner rotor 21 and the outer rotor 22 are rotatably supported in the axis S direction by the joint surface of the application object.

The first port 11c is formed to have a crescent-shaped profile when viewed in the direction of the axis S, is connected to the first communication passage 16, and is formed to be hollowed out from the thrust surface 11b toward the depth side in the direction of the axis S.

The second port 11d is formed to have a crescent-shaped profile when viewed in the direction of the axis S, is connected to the second communication passage 17, and is formed to be hollowed out from the thrust surface 11b toward the depth side in the direction of the axis S.

The first port 11c and the second port 11d are symmetrically arranged with a substantially 180-degree interval therebetween through the bearing hole 19 in the center line Yc direction.

Next, when the pump unit 20 rotates in one direction (positive rotation), the first port 11c functions as a suction port for sucking oil, and the second port 11d functions as a discharge port for discharging oil. On the other hand, when the pump unit 20 rotates in the other direction (reverse rotation), the first port 11c functions as a discharge port for discharging oil, and the second port 11d functions as a suction port for sucking oil.

Here, the first port 11c and the second port 11d are formed to open on the thrust surface 11b of the pump housing chamber 11. Therefore, the first port 11c and the second port 11d can be disposed in the region overlapping the first communicating channel 16 and the second communicating channel 17 in the direction of the axis S, and the main body 10 can be thinned in the direction of the axis S.

The suction passage 12 is formed as an elongated groove passage, is punched at the time of die forming in such a manner as to be elongated in the direction of the center line Yi, is connected to the first passage 14, the second passage 15, and the third passage 18, and is opened at the joint surface 10 a.

The suction passage 12 includes a cylindrical recess 12a in a region between the first passage 14 and the second passage 15 in the direction of the center line Yi.

The cylindrical recess 12a corresponds to an oil outlet of the application object.

The suction passage 12 has its opening closed by the joint surface of the application object except the cylindrical recess 12 a.

The discharge passage 13 is formed as an elongated grooved passage, is cast so as to extend in the direction of the center line Yo at the time of die forming, is connected to the first passage 14 and the second passage 15, is cast so as to bend and extend at a predetermined angle with respect to the center line Yo, is connected to the third passage 18, and forms an opening at the joint surface 10 a.

The discharge passage 13 includes a semi-cylindrical recess 13a in a region between the first passage 14 and the second passage 15 in the direction of the center line Yo, and a wall surface 13b forming the cylindrical recess on the X1 and X2 axes.

The semi-cylindrical recess 13a corresponds to an oil inlet of the application object.

The wall surface 13b is formed simultaneously when machining the first small-diameter passage 14b of the first passage 14 and the second small-diameter passage 15b of the second passage 15.

The discharge passage 13 is closed at its opening portion by the joint surface of the application object except the semi-cylindrical recess 13 a.

The first passage 14 is formed as a linear hole passage having a circular cross section, is cast and punched at the time of die forming so as to be parallel to the joint surface 10a and elongated in the direction of the axis X1, is opened at the side surface 10b, and is machined after die forming to connect the suction passage 12 and the discharge passage 13.

The first port 14 is formed as a first large diameter port 14a having a predetermined inner diameter Φ D1 in a region from the side surface 10a to the intersection with the first port 16, and is formed as a first small diameter port 14b having a predetermined inner diameter Φ D1 in a region from the intersection with the first port 16 to the intersection with the discharge port 13. Here, φ D1 > φ D1.

The first suction check valve 30 (the first suction sheet member 31, the first suction valve body 32, the first suction biasing spring 33) is disposed in the first large diameter passage 14a, and the plug 80 is fitted therein.

In the first small-diameter passage 14b, a first discharge check valve 40 (a first discharge sheet member 41, a first discharge valve body 42, a first discharge biasing spring 43) is disposed.

This prevents the first discharge check valve 40 from being caught in the area of the first large diameter passage 14a when inserted, and the first discharge check valve can be reliably fitted in a desired position.

Further, since the first intake check valve 30 can be set to be larger than the first discharge check valve 40, occurrence of cavitation or the like can be prevented, and desired pump performance can be ensured.

The second passage 15 is formed as a linear hole passage having a circular cross section, is punched at the time of die forming so as to be parallel to the joint surface 10a and elongated in the direction of the axis X2, is opened at the side surface 10b, and is machined after die forming to connect the suction passage 12 and the discharge passage 13.

The second passage 15 is formed as a second large-diameter passage 15a having a predetermined inner diameter Φ D2 in a region from the side surface 10a to the position of intersection with the second communication passage 17, and is formed as a second small-diameter passage 15b having a predetermined inner diameter Φ D2 in a region from the position of intersection with the second communication passage 17 to the position of intersection with the discharge passage 13. Here, φ D2 > φ D2. Here, Φ D1 is Φ D2, and Φ D1 is Φ D2.

In the second large diameter passage 15a, a second suction check valve 50 (a second suction sheet member 51, a second suction valve body 52, a second suction urging spring 53) is disposed, and a plug 80 is fitted.

The second discharge check valve 60 (the second discharge sheet member 61, the second discharge valve body 62, and the second discharge biasing spring 63) is disposed in the second small-diameter passage 15 b.

With this, when the second discharge check valve 60 is inserted, the second discharge check valve can be reliably fitted into a desired position while preventing biting or the like in the region of the second large diameter passage 15 a.

Further, since the second suction check valve 50 can be set to be larger than the second discharge check valve 60, occurrence of cavitation or the like can be prevented, and desired pump performance can be ensured.

The first communicating path 16 is formed as an elongated groove path, and is punched at the time of die forming so as to extend in the direction of the center line Yc, and an opening is formed in the joint surface 10a so that the first path 14 communicates with the first port 11c of the pump housing chamber 11.

The first communication path 16 blocks the opening portion thereof by the joint surface of the application object.

The second communicating path 17 is formed as an elongated groove path, and is punched at the time of die forming so as to extend in the direction of the center line Yc, and is opened at the joint surface 10a so that the second communicating path 15 communicates with the second port 11d of the pump accommodating chamber 11.

The second communication passage 17 closes the opening portion thereof with the joint surface of the application object.

The third passage 18 is a linear bore passage having a circular cross section with a predetermined inner diameter Φ D3, is cast and punched at the time of die forming so as to be parallel to the joint surface 10a and elongated in the direction of the axis X3, has an opening formed in the side surface 10b, is machined after die forming, and connects the suction passage 12 and the discharge passage 13.

The third passage 18 includes a stepped surface 18a and a small-diameter passage 18b at a position communicating with the discharge passage 13. The channels 18b are formed by coining.

Here, Φ D3 is Φ D1 is Φ D2.

Further, in the third passage 18, a relief valve 70 (a relief sheet member 71, a relief valve body 72, a relief biasing spring 73) is disposed, and a plug 80 is fitted.

The bearing hole 19 is formed as a cylindrical hole centered on the axis S so as to be opened in the thrust surface 11b in the direction of the axis S and not to penetrate the body 10 in order to rotatably support the rotary shaft 23.

The bearing hole 19 supports the rotary shaft 23 in the radial direction and the thrust direction so as to be rotatable about the axis S in a state where the inner rotor 21 and the outer rotor 22 of the pump unit 20 are disposed in the pump accommodating chamber 11 and the rotary shaft 23 is coupled to the inner rotor 21.

As described above, since the bearing hole 19 for supporting the rotary shaft 23 is provided in the region facing the pump housing chamber 11, and the rotary shaft 23 rotates the inner rotor 21, the rotary shaft 23 is supported by the bearing hole 19, so that the rotary shaft 23 can be supported without rattling even when the rotary shaft 23 is mounted in the pump device in advance or when the rotary shaft of the application object is coupled.

According to the main body 10 having the above-described configuration, the first channel 14 and the second channel 15 are linearly formed on both sides across the pump housing chamber 11. Further, a first suction check valve 30 and a first discharge check valve 40 are disposed in the linear first passage 14, and a second suction check valve 50 and a second discharge check valve 60 are disposed in the linear second passage 15.

Therefore, the channel structure is simplified, the manufacturing becomes easy, and the miniaturization, the cost reduction, and the like can be realized.

The pump accommodation chamber 11, the suction passage 12, the discharge passage 13, the first communication passage 16, and the second communication passage 17 are formed so as to open at the joint surface 10 a.

Therefore, when the body 10 is molded by a die or the like, the pump housing chamber 11, the suction passage 12, the discharge passage 13, the first connecting passage 16, and the second connecting passage 17 are cast to form a cylindrical recess and a groove passage, and then the pump housing chamber 11 or the like is machined as necessary, whereby a shape having a desired size can be obtained.

This reduces the number of machining steps, and reduces the manufacturing cost, the number of manufacturing steps, and the like.

The first, second, and

third passages

14, 15, and 18 are all formed in parallel, and are opened at the same side surface 10b of the body 10.

Therefore, when the body 10 is molded by a die or the like, the first channel 14, the second channel 15, and the third channel 18 can be cast in advance from the same direction to form a hole channel, and thereafter, if necessary, machined, thereby obtaining a channel having a desired inner diameter.

Therefore, the number of machining steps can be reduced, and manufacturing cost, manufacturing steps, and the like can be reduced.

Further, the first suction check valve 30 and the first discharge check valve 40 can be fitted into the first passage 14, the second suction check valve 50 and the second discharge check valve 60 can be fitted into the second passage 15, and the relief valve 70 can be fitted into the third passage 18 from the same direction with respect to the body 10, so that production preparation can be reduced and assembly work can be easily performed.

Further, since the suction duct 12 and the discharge duct 13 are disposed on both sides across the pump housing chamber 11 so as to be orthogonal to the first duct 14 and the second duct 15, the suction duct 12, the discharge duct 13, the first duct 14, and the second duct 15 can be disposed in a concentrated manner around the pump housing chamber 11. Therefore, the miniaturization of the main body 10 is facilitated.

The pump unit 20 is a positive displacement internal gear pump, rotates around an axis S, and includes an inner rotor 21, an outer rotor 22, and a rotary shaft 23.

The inner rotor 21 is formed of a material such as steel or sintered steel into an external gear having a tooth profile including a trochoid curve.

The inner rotor 21 includes a side surface 21a that slides on a joint surface of the application object, a side surface 21b that slides on the thrust surface 11b, a coupling hole 21c centered on the axis S, six convex portions (crests), and six concave portions (valleys).

The outer rotor 22 is formed as an internal gear made of a material such as steel or sintered steel, and has a tooth profile engageable with the inner rotor 21.

The outer rotor 22 includes a side surface 22a that slides on a joint surface of the application object, a side surface 22b that slides on the thrust surface 11b, a circular outer peripheral surface 22c centered on an axis that is offset by a predetermined amount from the axis S, seven convex portions, and seven concave portions.

The outer peripheral surface 22c is formed to be rotatably supported in contact with the inner peripheral surface 11a of the pump housing chamber 11.

The seven protrusions and the seven recesses are formed to partially engage with the six protrusions and the six recesses of the inner rotor 21.

The outer rotor 22 rotates around a predetermined axis at a slower speed than the inner rotor 21 in conjunction with the rotation of the inner rotor 21, and the inner rotor 21 rotates around the axis S. The inner rotor 21 and the outer rotor 22 partially mesh with each other to define a pump chamber, and the pump chamber continuously changes between the two to provide a pump action.

The rotation shaft 23 includes: a connection part 23a for transmitting a driving force from an application object; an engaging portion 23b that engages with the coupling hole 21c of the inner rotor 21; and a shaft portion 23c fitted into the bearing hole 19.

In addition, a trochoid pump is configured as a pump unit, which rotates the inner rotor 21 and the outer rotor 22 in conjunction with each other by rotating the rotary shaft 23 in one direction and the other direction, sucks oil into the pump chambers, and discharges the oil while pressurizing the oil.

Here, the pump unit 20 is an internal gear pump including the inner rotor 21 and the outer rotor 22, and thus the pump receiving chamber 11 can be simplified, the number of components can be reduced, and oil can be discharged at high pressure.

The rotary shaft 23 is rotatably fitted into a bearing hole 19, and the bearing hole 19 is formed in a region facing the pump housing chamber 11. Therefore, the rotary shaft 23 can be supported with high accuracy without generating rotational vibration.

The first suction check valve 30 includes a first suction sheet member 31, a first suction valve body 32, and a first suction urging spring 33.

The first suction sheet member 31 includes an outer peripheral surface 31a, a through hole 31b, a conical sheet surface 31c, and an annular end surface 31d, and the outer peripheral surface 31a is formed in a cylindrical shape and is fitted and fixed to the first large diameter path 14 a.

The first suction valve body 32 is formed in a spherical shape so as to be closely attached to the sheet surface 31 c.

The first intake biasing spring 33 is a compression-type coil spring, is disposed between the first intake valve body 32 and the first discharge sheet member 41, and biases the first intake valve body 32 in the valve closing direction.

The first discharge check valve 40 includes a first discharge sheet member 41, a first discharge valve body 42, and a first discharge urging spring 43.

The first discharge sheet member 41 includes an outer peripheral surface 41a, a through hole 41b, a conical sheet surface 41c, and an annular end surface 41d, and the outer peripheral surface 41a is formed in a cylindrical shape and is fitted and fixed to the first small-diameter passage 14 b.

The first discharge valve body 42 is formed in a spherical shape so as to be closely attached to the seat surface 41 c.

The first discharge biasing spring 43 is a compression-type coil spring, is disposed between the first discharge valve body 42 and the wall surface 13b of the discharge passage 13 which is a part of the main body 10, and biases the first discharge valve body 42 in the valve closing direction.

The second suction check valve 50 includes a second suction sheet member 51, a second suction valve body 52, and a second suction urging spring 53.

The second suction sheet member 51 includes an outer peripheral surface 51a, a through hole 51b, a conical sheet surface 51c, and an annular end surface 51d, and the outer peripheral surface 51a is formed in a cylindrical shape and fitted and fixed to the second large diameter passage 15 a.

The second suction valve body 52 is formed in a spherical shape so as to be in close contact with the sheet surface 51 c.

The second suction biasing spring 53 is a compression-type coil spring, is disposed between the second suction valve body 52 and the second discharge sheet member 61, and biases the second suction valve body 52 in the valve closing direction.

The second discharge check valve 60 includes a second discharge sheet member 61, a second discharge valve body 62, and a second discharge urging spring 63.

The second discharge sheet member 61 includes an outer peripheral surface 61a, a through hole 61b, a conical sheet surface 61c, and an annular end surface 61d, and the outer peripheral surface 61a is formed in a cylindrical shape and fitted and fixed to the second small-diameter passage 15 b.

The second discharge valve body 62 is formed in a spherical shape so as to be in close contact with the sheet surface 61 c.

The second discharge biasing spring 63 is a compression-type coil spring, is disposed between the second discharge valve body 62 and the wall surface 13b of the discharge passage 13 which is a part of the body 10, and biases the second discharge valve body 62 in the valve closing direction.

The relief valve 70 includes a relief sheet member 71, a relief valve body 72, and a relief biasing spring 73.

The retraction sheet member 71 includes an outer peripheral surface 71a, a through hole 71b, a conical sheet surface 71c, and an annular end surface 71d, and the outer peripheral surface 71a is formed in a cylindrical shape and is fitted and fixed to the third duct 18.

The pressure relief valve body 72 is formed in a spherical shape so as to be closely attached to the sheet surface 71 c.

The retraction urging spring 73 is a compression type coil spring, is disposed between the relief valve body 72 and a plug 80, and urges the relief valve body 72 in the valve closing direction, and the plug 80 is fitted and fixed to the third passage 18.

Further, the relief valve 70 functions as follows: the oil that has reached a pressure higher than a predetermined pressure in the discharge passage 13 is returned to the suction passage 12 through the third passage 18. This prevents the discharge of the excess pressure oil, and the oil can be discharged at a desired discharge pressure.

The plug 80 is formed in a cylindrical shape using an aluminum alloy or the like.

The plug 80 is a member that is fitted and fixed flush with the side surface 10b of the body 10 so as to close the opening portion in the side surface 10b of each channel (the first channel 14, the second channel 15, and the third channel 18).

The assembling operation of the pump device having the above-described structure will be described.

A machined body 10, a pump unit 20, a first intake check valve 30, a first discharge check valve 40, a second intake check valve 50, a second discharge check valve 60, a relief valve 70, and three plugs 80 are prepared in advance.

First, the first discharge check valve 40 and the first suction check valve 30 are fitted into the first passage 14 of the body 10 from the side surface 10b side, and then the plug 80 is fitted.

That is, the first discharge biasing spring 43 is inserted into the first small-diameter passage 14b, and then the first discharge valve body 42 is inserted. Next, the first discharge sheet member 41 is fitted and fixed to the first small-diameter passage 14b in the region between the first communication passage 16 and the discharge passage 13.

Here, one end of the first discharge biasing spring 43 is disposed in contact with the wall surface 13b of the discharge passage 13, and the other end is disposed in contact with the first discharge valve body 42, and is in a compressed state so as to bias the first discharge valve body 42 in the valve closing direction to be in close contact with the sheet surface 41 c.

The end surface 41d of the first discharge sheet member 41 is disposed flush with the wall surface of the first duct 16 or on the deeper side thereof by a predetermined amount so as not to protrude into the first duct 16.

Next, the first intake biasing spring 33 is inserted into the first large diameter passage 14a, and then the first intake valve body 32 is inserted. Next, the first suction sheet member 31 is fitted and fixed to the first large-diameter passage 14a in the region between the suction passage 12 and the first communicating passage 16.

Here, one end portion of the first suction biasing spring 33 is disposed in contact with the end surface 41d of the first discharge sheet member 41, and the other end portion is disposed in contact with the first suction valve body 32, and is in a compressed state so as to bias the first suction valve body 32 in the valve closing direction to be in close contact with the sheet surface 31 c.

The end surface 31d of the first suction sheet member 31 is disposed flush with the wall surface of the suction duct 12 or on the deeper side thereof by a predetermined amount so as not to protrude into the suction duct 12.

Next, the plug 80 is fitted and fixed to the first large diameter passage 14a so as to be flush with the side surface 10b of the main body 10 and not to protrude into the suction passage 12, in order to close the opening of the first passage 14 (first large diameter passage 14 a).

Next, the second discharge check valve 60 and the second suction check valve 50 are fitted into the second passage 15 of the body 10 from the side surface 10b side, and then the plug 80 is fitted.

That is, the second discharge biasing spring 63 is inserted into the second small-diameter passage 15b, and then the second discharge valve body 62 is inserted. Next, the second discharge sheet member 61 is fitted and fixed to the second small-diameter passage 15b in the region between the second communication passage 17 and the discharge passage 13.

Here, one end of the second discharge biasing spring 63 is disposed in contact with the wall surface 13b of the discharge passage 13, and the other end is disposed in contact with the second discharge valve body 62, and is in a compressed state so as to bias the second discharge valve body 62 in the valve closing direction to be in close contact with the sheet surface 61 c.

The end surface 61d of the second discharge sheet member 61 is disposed flush with the wall surface of the second communicating path 17 or on the deeper side thereof by a predetermined amount so as not to protrude into the second communicating path 17.

Next, the second suction biasing spring 53 is inserted into the second large diameter passage 15a, and then the second suction valve body 52 is inserted. Next, the second suction sheet member 51 is fitted and fixed to the second large diameter passage 15a in the region between the suction passage 12 and the second communicating passage 17.

Here, one end of the second suction biasing spring 53 is disposed in contact with the end surface 61d of the second discharge sheet member 61, and the other end is disposed in contact with the second suction valve body 52, and is in a compressed state so as to bias the second suction valve body 52 in the valve closing direction to be in close contact with the sheet surface 51 c.

The end surface 51d of the second suction sheet member 51 is disposed flush with the wall surface of the suction duct 12 or on the deeper side thereof by a predetermined amount so as not to protrude into the suction duct 12.

Next, the plug 80 is fitted and fixed to the second large diameter passage 15a so as to be flush with the side surface 10b of the main body 10 and not to protrude into the suction passage 12, in order to close the opening of the second passage 15 (second large diameter passage 15 a).

Next, the third passage 18 of the main body 10 is fitted into the relief valve 70 from the side of the side face 10b, and then fitted into the plug 80.

That is, the evacuation sheet member 71 is fitted and fixed to the third duct 18 in a region between the suction duct 12 and the discharge duct 13. Here, the retraction sheet member 71 is inserted until the end face 71d abuts on the step surface 18 a.

Next, the relief valve body 72 is inserted into the third passage 18, and then the retraction biasing spring 73 is inserted.

Next, the plug 80 is fitted and fixed to the third channel 18 so as to be flush with the side surface 10b of the body 10 and not to protrude into the suction channel 12, in order to close the opening of the third channel 18.

Here, one end of the retraction urging spring 73 is disposed in contact with the plug 80 and the other end is disposed in contact with the relief valve body 72, and is in a compressed state so as to urge the relief valve body 72 in the valve closing direction to be in close contact with the sheet surface 71 c.

Next, the pump unit 20 is loaded into the pump housing chamber 11 of the main body 10.

First, the rotary shaft 23 is rotatably fitted into the bearing hole 19.

Then, the inner rotor 21 is coupled to the rotating shaft 23. In the connection, the pin of the fitting portion 23b is fitted into the groove of the connection hole 21 c. Thereby, the rotary shaft 23 and the inner rotor 21 are connected to rotate integrally.

Next, the outer rotor 22 is fitted into the inner circumferential surface 11a so as to mesh with the inner rotor 21.

By the above, the assembly of the pump device is completed.

Further, the assembly of the respective parts is not limited to the order described, and other orders may be appropriately applied.

By sequentially assembling the components to the body 10 as described above, the first intake check valve 30 and the first discharge check valve 40 can be easily assembled to the first passage 14, the second intake check valve 50 and the second discharge check valve 60 can be easily assembled to the second passage 15, and the relief valve 70 can be easily assembled to the third passage 18, respectively, from the same direction.

Further, since the first suction biasing spring 33 abuts on the first discharge sheet member 41, the first discharge biasing spring 43 abuts on a part of the main body 10, the second suction biasing spring 53 abuts on the second discharge sheet member 61, the second discharge biasing spring 63 abuts on a part of the main body 10, and the retreat biasing spring 73 abuts on the plug 80 for closing the third passage 18, the components can be collectively arranged, and the number of components can be reduced.

Next, the operation of the pump device will be described with reference to fig. 9 to 11.

As shown in fig. 9, when the pump unit 20 rotates in one direction, the oil in the application object is sucked into the suction passage 12 from the oil outlet of the application object through the cylindrical recess 12 a.

Then, the sucked oil passes through the first suction check valve 30 in the first passage 14, passes through the first communication passage 16, and is sucked into the pump chamber from the first port 11 c.

Next, the oil sucked into the pump chamber is pressurized by the continuous change of the pump chamber of the pump unit 20, passes through the second communication passage 17 from the second port 11d, and passes through the second discharge check valve 60 in the second passage 15.

Then, the pressurized oil is discharged from the discharge passage 13 through the semi-cylindrical recess 13a and introduced into the oil inlet of the application object.

When the pump unit 20 is rotated in the other direction, as shown in fig. 10, the oil in the application object is sucked into the suction passage 12 from the oil outlet of the application object through the cylindrical recess 12 a.

Then, the sucked oil passes through the second suction check valve 50 in the second passage 15, passes through the second communication passage 17, and is sucked from the second port 11d into the pump chamber.

Next, the oil sucked into the pump chamber is pressurized by the continuous change of the pump chamber of the pump unit 20, passes through the first communication passage 16 from the first port 11c, and passes through the first discharge check valve 40 in the first passage 14.

On the other hand, as shown in fig. 11, when the pressure of the discharged oil exceeds a predetermined level and becomes an overpressure state in a state where the pump unit 20 is rotated in one direction, a part of the excess pressure oil passes through the relief valve 70 in the third passage 18 from the discharge passage 13 and returns to the suction passage 12.

Then, the returned oil passes through the first suction check valve 30 in the first passage 14 again together with the sucked oil, passes through the first communication passage 16, is sucked from the first port 11c into the pump chamber, and travels along the same path as described above.

The same applies to the case where the pressure of the discharged oil exceeds a predetermined level and becomes an overpressure state in the state where the pump unit 20 is rotated in the other direction.

As described above, according to the pump device, when the pump unit 20 rotates in one direction (normal rotation) and the other direction (reverse rotation), the oil is sucked and discharged, supplied to the application object, and circulated.

Further, since the oil that has exceeded the predetermined level and has been pressurized passes through the relief valve 70 in the third passage 18 and returns to the suction passage 12, discharge of the pressurized oil can be prevented, and the oil can be supplied at a desired discharge pressure.

As described above, according to the pump device of the above embodiment, the first passage 14 and the second passage 15 are linearly formed on both sides across the pump housing chamber 11, the first suction check valve 30 and the first discharge check valve 40 are disposed in the linear first passage 14, and the second suction check valve 50 and the second discharge check valve 60 are disposed in the linear second passage 15, so that the passage structure is simplified, the manufacturing is easy, and the downsizing, the cost reduction, and the like can be achieved.

In the embodiment, the following is shown: the present invention is applied to a structure in which a trochoid pump having a trochoid tooth shape is used as a pump unit. However, the present invention is not limited to this, and may be applied to a structure including an inner rotor and an outer rotor having an involute (involute) tooth profile, an inner rotor and an outer rotor having another tooth profile, or the like.

Further, the inner rotor 21 and the outer rotor 22 as the pump unit are configured to include six pieces and seven segments in a trochoidal manner, but the present invention is not limited thereto, and a configuration including another number may be adopted.

In the above embodiment, the relief valve 70 is used, but the present invention is not limited to this, and a configuration may be adopted in which the relief valve 70 is eliminated.

In the above embodiment, the orifice passages are shown as the first passage 14, the second passage 15, and the third passage 18, but the present invention is not limited to this, and the following configuration may be adopted: the check valves are formed as grooved channels, and openings are formed in the joint surface 10a, and the opening portions are fitted from the opening portions, and the joint surface of the application object is used to close the opening portions after assembly.

In the above-described embodiment, the pump unit 20 is shown as including the rotary shaft 23 as the pump device, but the present invention is not limited thereto. For example, if the rotary shaft of the application object is connected, the pump device may be configured with the rotary shaft removed.

In the above-described embodiment, the pump device according to the present invention is applied to an EV motor for an electric vehicle, an HEV motor for a hybrid electric vehicle, and the like, but the present invention is not limited thereto, and may be applied to other cooling systems and lubrication systems, and may also be applied to devices using fluids other than oil.

Claims

1. A pump apparatus, comprising:

a main body including a pump receiving chamber, a suction passage, a discharge passage, a first passage connecting the suction passage and the discharge passage, a second passage connecting the suction passage and the discharge passage, the first passage communicating the first passage with a first port of the pump receiving chamber, a first communicating passage communicating the second passage with a second port of the pump receiving chamber;

a positive displacement pump unit housed in the pump housing chamber and rotating around a predetermined axis;

a first suction check valve and a first discharge check valve disposed in the first passage; and

a second suction check valve and a second discharge check valve disposed in the second passage; and is

The first channel and the second channel are formed in a straight line on both sides across the pump accommodation chamber,

the body includes an engagement surface for engaging an object to be applied,

the pump receiving chamber is opened at the joint surface in the direction of the axis,

the suction passage, the discharge passage, the first communication passage, and the second communication passage are formed as groove passages that open at the joint surface,

the first passage and the second passage are formed as linear orifice passages that are parallel to the joint surface and open to the same side surface of the main body.

2. Pump apparatus according to claim 1,

the body includes a third passage connecting the suction passage with the discharge passage,

the pump device further includes a relief valve disposed in the third passageway.

3. Pump apparatus according to claim 2,

the third passage is formed as a linear orifice passage, which is parallel to the joint surface and has an opening formed in one side surface of the main body.

4. Pump apparatus according to claim 3,

the first, second, and third passages are formed parallel to each other, and openings are formed at the same side of the body.

5. Pump arrangement according to any one of claims 1 to 4,

the first port and the second port are formed so as to open onto a thrust surface of the pump housing chamber, and the thrust surface of the pump housing chamber supports the pump unit in the direction of the axis.

6. Pump arrangement according to any one of claims 1 to 4,

the suction passage and the discharge passage are disposed on both sides of the pump accommodating chamber so as to be orthogonal to the first passage and the second passage.

7. Pump apparatus according to claim 1,

the first passage includes a first large-diameter passage embedded in the first suction check valve and a first small-diameter passage embedded in the first discharge check valve,

the second passage includes a second large-diameter passage and a second small-diameter passage, the second large-diameter passage is embedded in the second suction check valve, and the second small-diameter passage is embedded in the second discharge check valve.

8. The pump arrangement according to claim 7,

the first suction check valve includes: a first suction sheet member fitted to the first large-diameter passage; a first suction valve body capable of being seated on the first suction sheet member; and a first suction urging spring that urges the first suction valve body toward the first suction sheet member;

the first discharge check valve includes: a first discharge sheet member fitted into the first small-diameter passage; a first discharge valve body capable of being seated on the first discharge sheet member; and a first discharge urging spring that urges the first discharge valve body toward the first discharge sheet member;

the second suction check valve includes: a second suction sheet member fitted to the second large-diameter passage; a second suction valve body capable of being seated on the second suction sheet member; and a second suction urging spring that urges the second suction valve body toward the second suction sheet member;

the second discharge check valve includes: a second discharge sheet member fitted into the second small-diameter passage; a second discharge valve body capable of being seated on the second discharge sheet member; and a second discharge biasing spring that biases the second discharge valve body toward the second discharge sheet member.

9. The pump arrangement according to claim 8,

the first suction urging spring abuts against the first discharge sheet member,

the first discharge forcing spring abuts against a part of the main body,

the second suction urging spring abuts against the second discharge sheet member,

the second discharge biasing spring abuts against a part of the main body.

10. Pump apparatus according to claim 2,

the pressure relief valve includes: a retreat sheet member fitted to the third channel; a relief valve body capable of being seated on the retraction sheet member; and a retreat biasing spring biasing the relief valve body toward the retreat sheet member;

the retreat force application spring is abutted against a plug blocking the third channel.

11. Pump arrangement according to any one of claims 1 to 4 and 7 to 10,

the pump unit is an internal gear pump and comprises an inner rotor and an outer rotor.

12. The pump arrangement according to claim 11,

the main body includes a bearing hole in a region facing the pump receiving chamber, the bearing hole supporting a rotation shaft that rotates the inner rotor.