WO2015045442A1

WO2015045442A1 - Oil pump device and relief valve

Info

Publication number: WO2015045442A1
Application number: PCT/JP2014/056687
Authority: WO
Inventors: 宏仁寺島
Original assignee: アイシン精機株式会社
Priority date: 2013-09-25
Filing date: 2014-03-13
Publication date: 2015-04-02
Also published as: JP2015063934A

Abstract

This oil device is equipped with an oil pump body, and a relief valve that is disposed on a discharge path of the oil pump body and opens/closes a relief path in accordance with the pressure in the discharge path. The relief valve includes a valve body for opening/closing the relief path, a valve body housing part for housing the valve body in such a manner as to allow the valve body to move between closed and open positions, a biasing member for biasing the valve body toward the closed position, and a seat part for seating the valve body biased by the biasing member in the closed position. In addition, the valve body housing part has an oil introduction hole part that is disposed on the discharge path-side end and has an inner diameter greater than or equal to the outer diameter of the barrel part of the valve body.

Description

Oil pump device and relief valve

The present invention relates to an oil pump device and a relief valve, and more particularly to an oil pump device and a relief valve provided with an oil pump body and a relief valve that opens and closes a relief path.

Conventionally, an oil pump device having an oil pump body and a relief valve that opens and closes a relief path is known. Such an oil pump device is disclosed in, for example, Utility Model Registration No. 1965810.

The utility model registration No. 1965810 discloses a cylindrical casing (valve element housing), a plunger (valve element) slidably incorporated in the casing, and a plunger attached to the discharge path side. A lubricating oil pump (oil pump device) is disclosed that includes a lubricating oil pressure adjusting device (relief valve) including a spring (biasing member) that urges. The lubricating oil pump described in this utility model registration No. 1965810 is provided with a relief path that connects the inside of the casing on the discharge path side and the suction side of the lubricating oil pump, and the discharge pressure of the lubricating oil and the spring The relief path is opened and closed by the plunger moving in the casing in accordance with the difference from the biasing force. When the discharge pressure is less than the predetermined value, the plunger is configured to close the relief path in the casing by the biasing force of the spring. In this case, the casing has a seating portion with a reduced diameter at the end that opens to the discharge path, and the distal end portion (outer peripheral edge) of the plunger comes into contact with the inner wall of the seating portion with the reduced diameter. The plunger is seated (held) in the casing without jumping out into the discharge path.

Utility Model Registration No. 1965810

However, in the pressure adjusting device for the lubricating oil pump described in the above-mentioned utility model registration No. 1965810, the end of the casing (valve body accommodating portion) that opens to the discharge path is reduced in diameter to form a seating portion. Therefore, when the oil (lubricating oil) is relieved, the oil pressure-fed from the discharge path to the inside of the casing is squeezed when passing through the seat portion having a reduced diameter. For this reason, there is a problem that the relief performance of the relief valve is deteriorated as much as the seating portion that narrows the cross-sectional area of the flow path becomes the flow resistance of the oil. In addition, it is necessary to reduce the diameter of the end on the discharge path side and provide a seating portion in the casing (valve body accommodating portion), and to process the tip shape of the plunger (valve body) according to the shape of the seating portion, There is a problem that the shape of the relief valve becomes complicated.

The present invention has been made to solve the above-described problems, and one object of the present invention is that it can be manufactured without having a complicated processing shape, and has an oil relief performance. An oil pump device and a relief valve that can be improved are provided.

In order to achieve the above object, an oil pump device according to a first aspect of the present invention is provided in an oil pump main body that sucks and discharges oil and a discharge path of the oil pump main body, and relief is performed according to the pressure in the discharge path. A relief valve that opens and closes the path, the relief valve includes a valve body that opens and closes the relief path, a valve body housing portion that movably houses the valve body between a closed position and an open position, and a valve body A biasing member that biases toward the closed position, and a seat that seats the valve body biased by the biasing member at the closed position, and the valve body accommodating portion is provided at an end on the discharge path side. And a hydraulic introduction hole having an inner diameter equal to or larger than the outer diameter of the body of the valve body.

In the oil pump device according to the first aspect of the present invention, as described above, the relief valve includes the valve body, the valve body housing portion, and the seating portion for seating the valve body in the closed position, and the valve body housing portion is provided. The hydraulic pressure that is provided at the end on the discharge path side and has a hydraulic pressure introduction hole having an inner diameter that is equal to or larger than the outer diameter of the body of the valve body, serves as a connection portion between the discharge path and the valve body housing section. Unlike the case where the introduction hole is formed smaller than the outer diameter of the body of the valve body, the flow passage cross-sectional area is not reduced by the inner diameter of the hydraulic introduction hole being equal to or greater than the outer diameter of the body of the valve body. There is no restriction on the flow of oil that passes through the oil pressure introduction hole during relief. That is, no oil flow resistance is generated due to the restriction of the flow path in the oil pressure introduction hole. Further, since the cross-sectional area of the flow path is not reduced, the valve body housing portion itself has a simple configuration. As a result, it is possible to manufacture the valve body housing portion of the relief valve without having a complicated processing shape, and it is possible to improve the oil relief performance in the oil pump device.

In the oil pump device according to the first aspect, the oil relief performance can be improved, so that the oil can be efficiently returned to the suction side. That is, the load (loss) of the drive source that drives the oil pump main body can be reduced. Furthermore, since the relief performance is improved, the size of the valve body can be further reduced, and the relief valve occupying the oil pump body can be reduced in size.

In the oil pump device according to the first aspect, preferably, the valve body housing portion has the same inner diameter at least from the hydraulic pressure introduction hole portion to the relief hole of the relief path. With this configuration, at least the inner diameter of the valve body accommodating portion in the section from the hydraulic pressure introduction hole portion that becomes the connection portion between the discharge path and the valve body housing portion to the relief hole of the valve body housing portion into which the oil flows into the relief path. Since the flow path cross-sectional area is not reduced, the flow resistance of the fluid (oil) due to the restriction is not generated. Thereby, the relief performance of the oil at the time of operating a relief valve can be improved more.

In the oil pump device according to the first aspect, preferably, the distal end surface of the valve body is a flat surface and has a circular outer shape when viewed from the discharge path side. With such a configuration, it is not necessary to form a complicated uneven shape (groove shape or the like) on the distal end surface of the valve body or the outer peripheral edge of the distal end surface, so that the valve body of the relief valve has a complicated machining shape. It can be manufactured without.

In the oil pump device according to the first aspect, the seating portion is preferably provided outside the valve body housing portion. If comprised in this way, the flow-path cross-sectional area inside the valve body accommodating part into which oil flows in at the time of relief by the seating part provided in the outer side of the valve body accommodating part will be reduced under the influence of the arrangement of the seating part. There is no. Therefore, even if the seating portion is provided on the relief valve, the relief performance can be reliably improved as much as fluid (oil) flow resistance does not occur due to the seating portion.

In this case, preferably, the seating portion is provided in the discharge path outside the valve body housing portion. According to this configuration, the seating portion can be disposed in the region closer to the valve body accommodating portion in the discharge path without providing the seating portion in the hydraulic pressure introducing hole portion. ) Can be suppressed from having a significant influence.

In the oil pump device according to the first aspect, preferably, the seating portion is provided in a region near the hydraulic pressure introduction hole portion inside the valve body housing portion. With this configuration, even if the seating portion is disposed in the vicinity of the hydraulic pressure introduction hole portion, the inner diameter of the valve body housing portion is not reduced and the flow passage cross-sectional area is not reduced. It does not affect the oil flow resistance in the section from the hole to the relief path. In addition, when the relief valve is not in operation, the seating portion is not arranged in the flow of oil flowing through the discharge path, so that the flow state of the oil flowing through the discharge path can be easily prevented due to the arrangement of the seating portion. Can be prevented.

In the oil pump device according to the first aspect, preferably, the seating portion has a circular cross section. If comprised in this way, the flow resistance of the oil around a seating part can be reduced. That is, when the valve body is seated at the closed position, the seat portion can be made less resistant to the flow of oil flowing through the discharge path. Furthermore, when the valve body moves to the open position, the seating portion can be made less resistant to the flow of oil drawn into the valve body housing portion (hydraulic introduction hole portion) from the discharge path.

In the oil pump device according to the first aspect, preferably, the seating portion is configured to contact at least a portion on the inner side of the outer peripheral edge portion of the distal end surface of the valve body. If comprised in this way, when the valve body urged | biased by the urging | biasing member is moved to a closed position, by the seating part which protruded to the part inside the outer-periphery edge part of the front end surface of a valve body Since the valve body can be reliably received in the region in the vicinity of the center portion of the distal end surface, the valve body can be reliably seated in the closed position.

In this case, preferably, the seating portion extends so as to intersect with the outer peripheral edge portion of the front end surface of the valve body, and at a position inside the outer peripheral edge portion of the front end surface of the valve body at the closed position of the valve body. The pin or the 1st convex part arrange | positioned so that it may contact | abut is included. If comprised in this way, the pin or the 1st convex part which cross | intersects the outer-periphery edge part of the front-end | tip surface of a valve body, and contact | abuts a part inside an outer-periphery edge part will be used. The valve body can be stably received via both the peripheral edge portion and the inner portion. Thereby, the valve body can be easily and reliably seated at the closed position.

In the configuration in which the seating portion includes a pin or a first convex portion, the seating portion is preferably a pin, and the pin has a function as a seating portion, and in addition to the first housing and the second housing constituting the oil pump main body. It also has a positioning function relative to the housing. If configured in this way, the pin serves both as a seating portion and a positioning function, so the number of parts of the oil pump device is smaller than when a positioning pin is additionally provided in addition to the seating portion pin. The increase can be suppressed.

In this case, preferably, the pin extends along the inner wall surface on the hydraulic pressure introduction hole side of the discharge path so as to cross the hydraulic pressure introduction hole to form a seating portion, and the end of the pin is the first housing and The first housing and the second housing are relatively positioned by being inserted into positioning holes formed in each of the second housings. If comprised in this way, while the pin used for positioning can be reliably fixed between the 1st housing and the 2nd housing, it crosses the oil pressure introduction hole of the pin fixed securely. It is possible to reliably perform the function of receiving the tip end surface of the valve body using the portion.

In the configuration in which the seating portion includes the pin or the first convex portion, preferably, the seating portion is the first convex portion, and the first convex portion is formed between the first housing and the second housing constituting the oil pump main body. It is provided integrally with either one. If comprised in this way, unlike the case where a 1st convex part is comprised as a member different from a 1st housing or a 2nd housing, a part of 1st housing or a 2nd housing will also serve as the seating part of a valve body. Therefore, it is possible to suppress an increase in the number of parts of the oil pump main body.

In the oil pump device according to the first aspect described above, preferably, the seating portion is provided integrally with the valve body so as to protrude from the distal end surface of the valve body to the discharge path side, and in the closed position of the valve body, It includes a second convex portion that abuts against the inner wall surface of the first housing or the second housing constituting the main body. If comprised in this way, the valve body itself will be easily seated when the valve body urged | biased by the urging | biasing member is moved to the closed position by the 2nd convex part integrally provided in the valve body. be able to. In addition, since the relief valve also has a seating function of the valve body simply by incorporating the valve body including the second convex part into the valve body accommodating part, the second convex part is configured as a separate member and incorporated into the valve body. Unlike this, the relief valve can be easily manufactured while suppressing an increase in the number of parts.

In this case, the valve body is preferably configured such that the tip of the second convex portion is positioned inside the valve body housing portion in a state where the valve body is moved to the open position. If comprised in this way, since the front-end | tip part of the 2nd convex part of a valve body does not protrude in a discharge path at the time of relief, the oil of a discharge path can be drawn in without trouble in a valve body accommodating part (hydraulic introduction hole part). . That is, it is possible to suppress the occurrence of flow resistance in the oil drawn into the relief path due to the second convex portion of the valve body protruding toward the discharge path during the relief.

A relief valve according to a second aspect of the present invention is provided in a discharge path for discharging oil, and moves a valve body between a closed position and an open position, and opens and closes the relief path according to the pressure of the discharge path. A valve body containing the valve body accommodating portion, a biasing member that biases the valve body toward the closed position, and a seating portion that seats the valve body biased by the biasing member in the closed position. The accommodating portion includes a hydraulic pressure introduction hole portion provided at an end portion on the discharge path side and having an inner diameter equal to or larger than the outer diameter of the body portion of the valve body.

In the relief valve according to the second aspect of the present invention, as described above, the relief valve includes a valve body, a valve body housing portion, and a seating portion for seating the valve body in a closed position. By introducing a hydraulic pressure introduction hole that is provided at the end on the discharge path side and has an inner diameter that is equal to or larger than the outer diameter of the body of the valve body, hydraulic pressure introduction that serves as a connection portion between the discharge path and the valve body housing section Unlike the case where the hole is formed smaller than the outer diameter of the body of the valve body, the flow passage cross-sectional area is not reduced by the internal diameter of the hydraulic pressure introduction hole being equal to or larger than the outer diameter of the body of the valve body. Sometimes there is no restriction on the flow of oil passing through the oil pressure introduction hole. That is, no oil flow resistance is generated due to the restriction of the flow path in the oil pressure introduction hole. Further, since the cross-sectional area of the flow path is not reduced, the valve body housing portion itself has a simple configuration. As a result, it is possible to manufacture the valve body housing portion of the relief valve without having a complicated processing shape, and it is possible to improve the oil relief performance in the oil pump device.

In the relief valve according to the second aspect, the oil relief performance can be improved, so that the oil can be efficiently returned to the suction side. That is, it is possible to reduce the load (loss) of the drive source that drives the oil pump main body provided with this relief valve. Furthermore, since the relief performance is improved, the size of the valve body can be further reduced, and the relief valve occupying the oil pump body can be reduced in size.

In the present application, the following configuration is also conceivable in the oil pump device according to the first aspect.

That is, in the oil pump device according to the first aspect, the seating portion is provided outside the valve body housing portion, and the front end surface of the valve body is in contact with the seating portion at the closed position of the valve body. The front end surface of the valve body is configured to be disposed in the vicinity of the inner wall surface on the hydraulic pressure introduction hole side of the discharge path. With this configuration, the valve body is closed in a state in which the distal end surface on the discharge path side of the valve body is arranged in the vicinity of the end of the hydraulic pressure introduction hole (the opening end where the hydraulic pressure introduction hole opens to the discharge path). Can be seated in position. As a result, it is possible to suppress the formation of a large convex inner wall surface in which the front end surface of the valve body protrudes greatly in the discharge path when the valve body is seated, thereby increasing the oil flow resistance in the discharge path. Can be suppressed.

According to the present invention, as described above, it is possible to provide an oil pump device and a relief valve that can be manufactured without having a complicated processing shape and that can improve the oil relief performance. it can.

It is the figure which showed the whole structure of the oil pump apparatus by 1st Embodiment of this invention. It is the figure which showed typically the structure of the oil pump apparatus by 1st Embodiment of this invention. It is an expanded sectional view showing composition of a relief valve periphery in an oil pump device by a 1st embodiment of the present invention. It is the figure which showed typically the structure of the oil pump apparatus by 1st Embodiment of this invention. It is the figure which showed the performance of the relief valve in the oil pump apparatus by 1st Embodiment of this invention, and the performance of the relief valve in the oil pump apparatus as a comparative example with respect to embodiment. It is the figure which showed typically the structure of the oil pump apparatus by the modification of 1st Embodiment of this invention. It is the figure which showed the whole structure of the oil pump apparatus by 2nd Embodiment of this invention. It is the figure which showed typically the structure of the oil pump apparatus by 2nd Embodiment of this invention. FIG. 6 is an enlarged cross-sectional view showing a configuration around a relief valve in an oil pump device according to a second embodiment of the present invention. It is the figure which showed typically the structure of the oil pump apparatus by 2nd Embodiment of this invention. It is the expanded sectional view which showed the structure of the relief valve periphery in the oil pump apparatus by 3rd Embodiment of this invention. It is the figure which showed typically the structure of the oil pump apparatus by 3rd Embodiment of this invention. It is the figure which showed the whole structure of the oil pump apparatus by 4th Embodiment of this invention. It is an expanded sectional view showing composition of a relief valve periphery in an oil pump device by a 5th embodiment of the present invention.

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

(First embodiment)
First, the configuration of the oil pump device 100 according to the first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numerals are given to main components constituting the oil pump device 100, and in FIGS. 2 to 4, reference numerals are given to detailed configurations (structures) around the relief valve 20. It is attached.

As shown in FIG. 2, the oil pump device 100 according to the first embodiment of the present invention is mounted on an automobile (not shown) including an engine (internal combustion engine) 90, and oil (engine) Oil) 1 is supplied to the movable portion such as the piston 92 and the crankshaft 93. Specifically, the oil pump device 100 includes an oil pump body 10 that sucks and discharges the oil 1.

As shown in FIG. 1, the oil pump body 10 is configured as a trochoid oil pump that is an inscribed gear type, and includes an aluminum alloy casing 2 and an inner rotor 11 that is rotatably provided in the casing 2. And an outer rotor 12 and an aluminum alloy cover 3 (see FIG. 3) that covers the casing 2. The inner rotor 11 is configured to transmit the driving force of the engine 90 (see FIG. 2). When the inner rotor 11 rotates in the arrow P direction, the outer rotor 12 also rotates in the same direction. At this time, the volume of the space S formed between the teeth 11a (mountains) and the teeth 12a (valleys) of both rotors is increased or decreased as the rotors rotate. Therefore, the oil 1 is sucked into the oil pump body 10 as the pressure in the space S decreases with the volume change from the minimum value to the maximum value of the space S, and the volume change from the maximum value to the minimum value of the space S. Accordingly, the oil 1 sucked as the pressure in the space S increases is discharged out of the oil pump main body 10. The casing 2 and the cover 3 are examples of the “first housing” and the “second housing” in the present invention, respectively.

As shown in FIGS. 1 and 2, in the oil pump main body 10, a suction port 4 for sucking oil 1, a discharge port 5 for discharging oil 1, and a discharge path connected to the discharge port 5. 6 and a relief path 7 configured to allow the discharge path 6 and the suction port 4 to communicate with each other. Accordingly, the oil pump body 10 has a function of sucking the oil 1 from the oil pan 91 (see FIG. 2) via the suction port 4 and discharging the oil 1 from the discharge port 5 in a state where a predetermined hydraulic pressure is generated. . The oil 1 is pumped toward an oil filter (not shown) via the discharge path 6. Further, the oil 1 from which foreign matter has been removed after passing through the oil filter is supplied to a movable part (sliding part) in the engine 90.

In addition, the flow path of the oil 1 including the suction port 4, the discharge port 5, the discharge path 6, and the relief path 7 in the oil pump main body 10 has a cover 3 (see FIG. 3) attached to the casing 2 (see FIG. 1). Each is formed with a predetermined flow path shape.

Also, the oil pump body 10 is provided with a relief valve 20 that operates when the pressure of the oil 1 discharged from the discharge port 5 exceeds a specified value. The relief valve 20 is disposed at a portion connecting the discharge path 6 and the relief path 7, and the relief valve 20 has a function of opening and closing the relief path 7 according to the pressure of the discharge path 6 (pressure of the oil 1). have.

Specifically, as shown in FIG. 4, when the pressure of the oil 1 becomes a specified value or more, the relief valve 20 is operated to open the relief path 7. Then, excess oil 1 that causes a pressure higher than a specified value is returned to the suction port 4 of the oil pump body 10 via the relief path 7. Thereby, the discharge pressure of the oil 1 is adjusted. The reason why the relief valve 20 is provided is that the amount of oil 1 pumped by the oil pump main body 10 increases in proportion to the rotational speed (the number of revolutions) of the engine 90. This is to prevent oil leakage and breakage from occurring in the lubrication path due to unnecessarily rising. Further, when the engine 90 is started at a low temperature, the oil pressure increases greatly as the viscosity of the oil 1 increases, and the resistance of the oil pump main body 10 may increase and may be damaged. The relief valve 20 also operates in such a case and has the purpose of preventing the oil pump main body 10 from being damaged by maintaining the hydraulic pressure within a specified value.

Further, the oil pump device 100 has an “inner relief structure” in which the oil 1 is returned to the suction port 4 through the relief path 7 at the time of relief. Although the operation will be described later, when the number of revolutions of the engine 90 decreases and the pressure of the oil 1 becomes less than a specified value, the relief valve 20 is closed as shown in FIG. All the oil 1 discharged from 10 flows through the discharge path 6 and is pumped to an oil filter (not shown). Below, the structure of the relief valve 20 is demonstrated in detail.

As shown in FIG. 2, the relief valve 20 includes a valve body 21, a valve body housing portion 22 that houses the valve body 21, and a coil-like shape that biases the valve body 21 toward the closed position (discharge path 6 side). And a spring 23. The valve body accommodating part 22 is formed in the casing 2 in the shape of an axial hole along the center line 150, and is configured so that the valve body 21 can move in the axial direction inside. The inner diameter D 2 of the valve body housing portion 22 is formed by a minute amount larger than the outer diameter D 1 of the valve body 21, and the outer surface (body portion 21 b) of the valve body 21 is the inner surface of the valve body housing portion 22. It is comprised so that it may slide smoothly with respect to. Thereby, the valve body 21 is centered on the center line 150 between a closed position (see FIG. 2) for closing a relief path 7 (described later) and an open position (see FIG. 4) for opening the relief path 7 in the valve body housing portion 22. It is housed so that it can move along. The spring 23 is an example of the “biasing member” in the present invention.

Further, the valve body accommodating portion 22 connects the discharge path 6 and the relief path 7. Thereby, a part of valve body accommodating part 22 becomes a flow path of the oil 1 at the time of relief (refer FIG. 4). In addition, the valve body accommodating portion 22 includes an inner surface 22a extending in the longitudinal direction (axial hole direction) along the center line 150, and a hydraulic pressure introduction provided at a portion where one end of the inner surface 22a opens to the discharge path 6 side. It has a hole 22b, a bottom 22c made of a flat surface that closes the other end of the inner surface 22a, and a relief hole 22d formed at a predetermined position on the inner surface 22a. Here, the relief hole 22d has a predetermined inner diameter and is provided only at one place on the inner side surface 22a. Accordingly, the discharge path 6 is connected to the valve body housing part 22 via the hydraulic pressure introduction hole 22b, and the relief path 7 is connected to the inner side surface 22a of the valve body housing part 22 via the relief hole 22d. Yes.

Further, as shown in FIG. 2, the valve body 21 has a tip surface 21a formed on one side facing the discharge path 6, and a linear shape and a circumference from the outer peripheral edge portion 21e of the tip surface 21a to the rear. The body portion 21b extends in a shape, and the recess portion 21c is provided inside the body portion 21b. That is, the valve body 21 has a simple shape in which the inside is hollowed out, leaving the front end surface 21a and the circumferential body portion 21b. In this case, the cross-sectional shape along the surface parallel to the front end surface 21a of the valve body 21 serving as the pressure receiving surface is formed in an annular shape (ring shape).

In addition, the relief valve 20 has the front end surface 21a of the valve body 21 on the front side (surface facing the discharge path 6) with the spring 23 fitted between the bottom 22c of the valve body housing portion 22 and the recess 21c of the valve body 21. And inserted into the valve body accommodating portion 22. Then, when the body portion 21b of the valve body 21 slides along the center line 150 with respect to the inner side surface 22a of the valve body housing portion 22, the valve body 21 closes the relief hole 22d (see FIG. 2). ) And an open position (see FIG. 4) where the relief hole 22d is opened. Here, the valve body 21 is biased in the direction of the arrow Q1 against the pressure of the oil 1 by the spring 23 when not operating as shown in FIG. Further, when the pressure of the oil 1 exceeds a specified value and exceeds the urging force of the spring 23, as shown in FIG. 4, the valve body 21 receives the pressure of the oil 1 through the distal end surface 21a, thereby causing an arrow Q2. Moved in the direction.

Here, in the first embodiment, as shown in FIGS. 1 and 2, the hydraulic pressure introduction hole 22 b of the valve body housing portion 22 has an inner diameter that is a minute amount larger than the outer diameter D 1 of the body portion 21 b of the valve body 21. D2. That is, the inner side surface 22a of the valve body housing portion 22 has the same inner diameter D2 in at least a section from the hydraulic pressure introduction hole portion 22b to the relief hole 22d of the relief path 7. In other words, the inner diameter D2 of the valve body housing portion 22 is reduced along the direction of the arrow Q1 at the tip end (opening end portion) of the hydraulic pressure introduction hole portion 22b that is a connection portion between the discharge path 6 and the valve body housing portion 22. The inner side surface 22a is formed so as not to occur. As a result, in the section from the oil pressure introduction hole 22b serving as a connection portion between the discharge path 6 and the valve body housing part 22 to the relief hole 22d of the valve body housing part 22 where the oil 1 flows into the relief path 7, the valve body housing part. The channel cross-sectional area of 22 is not reduced.

In the first embodiment, the distal end surface 21a of the valve body 21 is a flat surface, and the distal end surface 21a is viewed from the discharge path 6 side (hydraulic introduction hole 22b side) in the direction of the arrow Q2 (see FIG. 4). And has a circular outer shape. Therefore, the valve body 21 is configured to be accommodated in the valve body accommodating portion 22 without any limitation on the rotation angle around the center line 150.

Further, in the oil pump main body 10, as shown in FIG. 3, the cover 3 is covered in a state where the inner rotor 11 and the outer rotor 12 (see FIG. 1) are arranged on the casing 2.

Bolt holes

2a and 3a are formed in the outer peripheral portions of the casing 2 and the cover 3, respectively. The cover 3 is attached to the casing 2 using a plurality of bolts (not shown). In FIG. 2, the illustration of the cover 3 disposed on the front side of the casing 2 is omitted except for the bolt holes 3 a.

Further, when the cover 3 is fixed to the casing 2, a positioning pin 30 is sandwiched between the casing 2 and the cover 3 so that the cover 3 is disposed at an appropriate position with respect to the casing 2. Has been. Specifically, the pin 30 is a member made of stainless steel or iron having a circular cross section and extending linearly (bar-shaped). Further, the pin 30 extends so as to cross the hydraulic pressure introduction hole 22 b along the inner wall surface 6 a on the hydraulic pressure introduction hole 22 b side of the discharge path 6. Then, the cover 3 is configured to be positioned with respect to the casing 2 by inserting the pins 30 into

holes

2b and 3b (see FIG. 3) formed at predetermined positions of the casing 2 and the cover 3. The pin 30 is an example of the “sitting portion” in the present invention.

Here, in the first embodiment, the pin 30 having a relative positioning function between the casing 2 and the cover 3 is used to place the valve element 21 at a predetermined position when the relief valve 20 is not operated (non-relief). It is comprised so that it may be seated on.

That is, as shown in FIGS. 1 and 3, the pin 30 is disposed outside the shaft hole-shaped valve body accommodating portion 22 in the casing 2 (cover 3) and in a region where the discharge path 6 is formed. Yes. Further, as shown in FIG. 3, the pin 30 extends along the Y1 direction (Y2 direction) so as to intersect (orthogonally) the outer peripheral edge portion 21e of the distal end surface 21a of the valve body 21. Therefore, the valve body 21 urged in the arrow Q1 direction against the pressure of the oil 1 by the spring 23 is pinned over the entire region in the maximum diameter direction (Y direction) of the distal end surface 21a in the closed position of the valve body 21. The circular side surface 30a rounded around the central axis 30 is configured to abut. Thereby, when the relief valve 20 is not operating, the valve body 21 is configured to be stably seated (held) in the closed position.

In the first embodiment, the front end surface 21 a of the valve body 21 is in contact with the side surface 30 a of the pin 30 in the closed position of the valve body 21, and the front end surface 21 a of the valve body 21 is the hydraulic pressure introduction hole of the discharge path 6. It arrange | positions in the vicinity of the inner wall face 6a by the part 22b side. In this case, the front end surface 21a and the inner wall surface 6a have continuity and are arranged in the same plane. Therefore, when the valve body 21 is seated, the discharge path 6 is not formed with a convex inner wall surface 6 a in which the tip end surface 21 a of the valve body 21 protrudes into the discharge path 6. Thereby, it is suppressed that the flow resistance of the oil 1 in the discharge path 6 increases due to the shape of the inner wall surface 6a.

Further, by being configured as described above, the oil pump device 100 has the following operation characteristics (relief characteristics).

As an example of the operating characteristics of the oil pump device 100, the characteristic of the discharge pressure (vertical axis) of the oil 1 discharged from the oil pump main body 10 with respect to the rotational speed (horizontal axis) of the engine 90 is shown in FIG. FIG. 5 shows operating characteristics (relief characteristics) of a conventional oil pump device as a comparative example, in addition to the operating characteristics of the oil pump device 100. In the oil pump device as a comparative example (conventional example), the distal end portion (opening end portion) of the valve body housing portion on the discharge path 6 side is reduced in diameter relative to the inside of the valve body housing portion. At the time of non-operation, the distal end portion of the valve body comes into contact with the reduced diameter distal end portion (opening end portion) and is seated (held).

As shown in FIG. 5, in the low speed range of the engine 90 (see FIG. 2), the discharge pressure of the oil 1 (see FIG. 2) increases as the rotational speed increases. That is, the oil 1 is not relieved in the section from about 500 revolutions / minute to about 2200 revolutions / minute. Therefore, the oil 1 flows only through the discharge path 6 shown in FIG. In this example, when the rotational speed of the engine 90 reaches approximately 2200 rpm, relief to the suction side of the oil pump device 100 is started. In a section where the rotational speed of the engine 90 is about 2200 revolutions / minute or more, the discharge pressure of the oil 1 (hydraulic pressure of the discharge path 6) increases, and the relief valve 20 gradually moves in the direction of the arrow Q2 to overcome the spring force. Is done. Therefore, as shown in FIG. 4, not only the discharge path 6 but also a part of the oil 1 is guided to the valve body accommodating part 22 through the hydraulic pressure introducing hole part 22b and from the relief hole 22d to the relief path 7 as shown in FIG. It is returned to the suction port 4 of the oil pump body 10.

Here, as shown in FIG. 5, also in the oil pump device of the comparative example, the relief valve is switched from the closed state to the open state at about 2200 rpm. And the discharge pressure of the oil 1 after relief has the characteristic shown with the graph B described using the broken line. On the other hand, in the case of the oil pump device 100 according to the first embodiment, the discharge pressure of the oil 1 after the operation of the relief valve 20 has a characteristic indicated by a graph A described using a solid line. Here, the slope of the graph A is smaller than that of the graph B. That is, the discharge pressure of the oil 1 after the relief valve 20 is operated in the oil pump device 100 is lower than the discharge pressure of the oil 1 after the relief of the oil pump device in the comparative example.

The reason why the oil pump device 100 has the relief characteristics shown in the graph A will be described. That is, in the relief valve 20, the flow path cross-sectional area is not reduced because the inner diameter D 2 of the hydraulic pressure introduction hole 22 b is larger than the outer diameter D 1 of the body 21 b of the valve body 21. No restriction occurs in the flow of the oil 1 passing through 22b. In other words, the flow resistance of the oil 1 due to the restriction of the flow path in the hydraulic pressure introduction hole 22b does not occur. On the contrary, in the relief valve in the comparative example, the distal end portion (opening end portion) of the valve body housing portion on the discharge path 6 side is reduced in diameter relative to the inside of the valve body housing portion. Since the road cross-sectional area is reduced, a restriction occurs in the flow of the oil 1 that passes through the end of the valve body housing portion on the discharge path 6 side during relief. Therefore, the comparative example (graph B) shows the result that the relief performance at the time of relief deteriorates (the degree of the effect of reducing the discharge pressure is small) by the amount of flow resistance of the oil 1 caused by the restriction. As described above, in the oil pump device 100 (graph A), the relief performance is improved as much as the flow resistance of the oil 1 passing through the hydraulic pressure introduction hole 22b is not reduced and the flow resistance is reduced as compared with the comparative example. (The degree of the effect of reducing the discharge pressure is large).

In addition, when the graph B (comparative example) is used as a reference, the relief performance of the oil pump device 100 is improved (improved) so as to have the relief characteristics of the graph A. Can be driven. Since the inner rotor 11 (see FIG. 1) in the oil pump main body 10 transmits the driving force of the engine 90, the reduction of the pump power contributes to the reduction of the load (loss) of the engine 90 and the fuel consumption rate is improved. .

Further, improvement (improvement) of the relief performance of the oil pump device 100 is also effective in the following points. That is, when the engine 90 is started under a low temperature condition, the oil pressure of the discharged oil 1 is greatly increased due to the high viscosity of the oil 1. Since the oil pump device 100 has excellent relief performance even at a low temperature start, the effect of reducing the discharge pressure is large, so that a rapid increase in the oil pressure of the oil 1 after the oil pump body 10 is started is effectively suppressed. be able to. In addition, by improving the relief performance, the size of the valve body 21 (the outer diameter D1 of the body portion 21b) can be further reduced, contributing to the downsizing of the relief valve 20 in the oil pump body 10. To do. The oil pump device 100 in the first embodiment is configured as described above.

In the first embodiment, the following effects can be obtained.

That is, in the first embodiment, as described above, the relief valve 20 includes the valve body 21, the valve body housing portion 22, and the pin 30 for seating the valve body 21 in the closed position. The discharge passage 6 and the discharge passage 6 are configured to have a hydraulic introduction hole portion 22b having an inner diameter D2 that is provided at an end portion on the discharge passage 6 side and is larger than the outer diameter D1 of the body portion 21b of the valve body 21 by a minute amount. Unlike the case where the hydraulic pressure introduction hole 22b serving as a connection portion with the valve body accommodating portion 22 is formed smaller than the outer diameter D1 of the body portion 21b of the valve body 21, the inner diameter D2 of the hydraulic pressure introduction hole 22b is the same as that of the valve body 21. Since the cross-sectional area of the flow path is not reduced by being a minute amount larger than the outer diameter D1 of the body portion 21b, the flow of the oil 1 passing through the hydraulic pressure introduction hole portion 22b is not restricted during relief. That is, the flow resistance of the oil 1 due to the restriction of the flow path in the hydraulic pressure introduction hole 22b does not occur. Further, since the cross-sectional area of the flow path is not reduced, the valve body accommodating portion 22 itself has a simple configuration. As a result, the valve body housing portion 22 of the relief valve 20 can be manufactured without having a complicated processing shape, and the relief performance of the oil 1 in the oil pump device 100 can be improved.

Also, in the first embodiment, the oil 1 can be efficiently returned to the suction side by improving the relief performance of the oil pump device 100 (the degree of the effect of reducing the discharge pressure is large). That is, since the load (loss) of the engine 90 that rotates the inner rotor 11 can be reduced, the fuel consumption rate of the engine 90 can be improved.

Further, in the first embodiment, the valve body accommodating portion 22 is configured to have the same inner diameter D2 in a portion from the hydraulic pressure introducing hole portion 22b to the relief hole 22d of the relief path 7. As a result, at least in the section from the oil pressure introduction hole 22b, which is a connecting portion between the discharge path 6 and the valve body housing part 22, to the relief hole 22d of the valve body housing part 22 where the oil 1 flows into the relief path 7, the valve body is housed. Since the inner diameter D2 of the portion 22 is constant and the cross-sectional area of the flow path is not reduced, the flow resistance of the oil 1 due to the restriction is not generated. Therefore, the relief performance of the oil 1 when the relief valve 20 is operated can be further improved. Further, since the relief performance is further improved, the size of the valve body 21 (the outer diameter D1 of the body portion 21b) can be further reduced, and the relief valve 20 occupying the oil pump main body 10 can be reduced in size. Can do.

In the first embodiment, the distal end surface 21a of the valve body 21 is configured to have a flat outer surface and a circular outer shape when viewed from the discharge path 6 side. Accordingly, it is not necessary to form a complicated uneven shape such as a groove shape on the distal end surface 21a of the valve body 21 or the outer peripheral edge portion 21e of the distal end surface 21a, so that the valve body 21 of the relief valve 20 has a complicated processed shape. It can be manufactured without.

In the first embodiment, the pin 30 has a function of seating the valve body 21. In addition to the seating function of the valve body 21, the pin 30 also has a relative positioning function between the casing 2 and the cover 3 constituting the oil pump main body 10. As a result, the pin 30 has both a function as a seating portion and a positioning function, so that the number of parts of the oil pump device 100 is increased as compared with the case where a positioning pin is separately provided in addition to the seating portion pin 30. Can be suppressed. Further, the pin 30 which is one component of the relief valve 20 used as the seating portion of the valve body 21 can be effectively used as a member for positioning the casing 2 and the cover 3 relative to each other when the oil pump body 10 is assembled. can do.

Further, in the first embodiment, the pin 30 is provided outside the valve body housing portion 22. As a result, the flow passage cross-sectional area inside the valve body housing portion 22 into which the oil 1 flows during relief by the pin 30 provided outside the valve body housing portion 22 is reduced by the influence of the arrangement of the pins 30. Absent. Therefore, even if the relief valve 20 is provided with the pin 30, the relief performance can be reliably improved as much as the flow resistance of the oil 1 does not occur due to the pin 30.

Further, in the first embodiment, the pin 30 is provided in the discharge path 6 outside the valve body housing portion 22. As a result, the pin 30 can be disposed in a region closer to the valve body accommodating portion 22 in the discharge path 6 without providing the pin 30 in the hydraulic pressure introducing hole portion 22b. A significant influence on the flow can be suppressed.

Further, in the first embodiment, the pin 30 extends along the inner wall surface 6a on the hydraulic pressure introduction hole 22b side of the discharge path 6 so as to cross the hydraulic pressure introduction hole 22b and constitutes a seating part. Then, both ends of the pin 30 are inserted into

positioning holes

2b and 3b formed in the casing 2 and the cover 3, respectively, so that the casing 2 and the cover 3 are relatively positioned. Thereby, the pin 30 used for positioning can be reliably fixed between the casing 2 and the cover 3, and the portion (side surface 30a) crossing the oil pressure introducing hole of the pin 30 securely fixed. The function of receiving the distal end surface 21a of the valve body 21 can be surely performed.

Further, in the first embodiment, the pin 30 extends so as to intersect the outer peripheral edge portion 21e of the distal end surface 21a of the valve body 21, and the entire distal end surface 21a of the valve body 21 in the closed position of the valve body 21. The pins 30 are arranged so that the side surfaces 30a come into contact with each other. Thereby, when the valve body 21 urged by the spring 23 is moved to the closed position, the pin 30 (side surface) protrudes to a portion inside the outer peripheral edge portion 21e of the distal end surface 21a of the valve body 21. 30a), the valve body 21 can be reliably received through the region near the central portion of the tip surface 21a, so that the valve body 21 is received by the pin 30 only by the outer peripheral edge portion 21e of the tip surface 21a. The moving valve body 21 can be received reliably and stably. At this time, the distal end surface of the moving valve body 21 using the pin 30 whose side surface 30a intersects the outer peripheral edge portion 21e of the distal end surface 21a of the valve body 21 and abuts on the inner side of the outer peripheral edge portion 21e. The valve body 21 can be stably received through both the outer peripheral edge portion 21e and the inner portion of 21a. Thereby, the valve body 21 can be easily and reliably seated at the closed position.

In the first embodiment, the pin 30 as the seating portion is configured to have a circular cross section. Thereby, the flow resistance of the oil 1 around the pin 30 can be reduced. That is, when the valve body 21 is seated at the closed position, the pin 30 can be made less resistant to the flow of the oil 1 flowing through the discharge path 6. Furthermore, when the valve body 21 moves to the open position, the pin 30 is less likely to become resistant to the flow of oil 1 drawn from the discharge path 6 into the valve body housing portion 22 (hydraulic introduction hole portion 22b). can do.

In the first embodiment, the front end surface 21 a of the valve body 21 is in contact with the side surface 30 a of the pin 30 in the closed position of the valve body 21, and the front end surface 21 a of the valve body 21 is the hydraulic pressure introduction hole of the discharge path 6. It arrange | positions so that it may arrange | position in the vicinity of the inner wall face 6a at the part 22b side. In this case, the front end surface 21a and the inner wall surface 6a have continuity and are arranged in the same plane. As a result, the valve body 21 is placed in a state in which the distal end surface 21a on the discharge path 6 side of the valve body 21 is aligned with the end of the hydraulic introduction hole 22b (the opening end where the hydraulic introduction hole 22b opens into the discharge path 6). It can be seated in the closed position. That is, it is possible to suppress the formation of a large convex inner wall surface 6a such that the tip end surface 21a of the valve body 21 protrudes greatly in the discharge path 6 when the valve body 21 is seated. An increase in flow resistance can be suppressed. Further, since the pin 30 can be disposed in the vicinity of the valve body housing portion 22 (hydraulic introduction hole portion 22b) in the discharge path 6, the valve body 21 moving inside the valve body housing portion 22 can be easily placed in the closed position. Can be seated.

(Modification of the first embodiment)
Next, a modification of the first embodiment will be described with reference to FIGS. 2 and 6. In the modification of the first embodiment, unlike the oil pump device 100 (see FIG. 2) in the first embodiment in which the relief path 7 is connected to the suction port 4 of the oil pump body 10, the relief path 7a is an oil An example in which the oil pump device 110 is configured to be connected to the pan 91 will be described. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

That is, in the oil pump device 110 according to the modification of the first embodiment, as shown in FIG. 6, the relief path 7a in the oil pump main body 110 is connected at one end to the valve body housing portion 22 via the relief hole 22d. And the other end (return port) communicates with the oil pan 91. Therefore, the oil pump device 110 has an “outer relief structure” in which the oil 1 flowing through the relief path 7 a is returned to the oil pan 91 when the pressure of the oil 1 becomes a specified value or more. The oil pump device 110 including the structure around the relief valve 20 is the same as the oil pump device 100 (see FIG. 2) of the first embodiment except that the oil 1 is returned to the oil pan 91. It is configured.

In the modification of the first embodiment, as described above, the oil pump device 110 has an outer relief structure in which the other end (return port) of the relief path 7 a communicates with the oil pan 91. Even in this case, since the inner diameter D2 of the hydraulic pressure introduction hole 22b is formed to be larger than the outer diameter D1 of the body 21b of the valve body 21, the flow of the oil 1 passing through the hydraulic pressure introduction hole 22b during relief is restricted. It does not occur, and the relief performance of the oil 1 using the relief path 7a can be improved. The remaining effects of the modification of the first embodiment are similar to those of the aforementioned first embodiment.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. 1 and FIGS. In the second embodiment, unlike the oil pump device 100 (see FIG. 1) in the first embodiment in which the valve body 21 is seated using the positioning pin 30, the valve body is provided instead of providing the pin 30. An example in which the oil pump device 200 is configured by integrally providing a seating convex portion 221d on the 221 will be described. The convex portion 221d is an example of the “second convex portion” and the “sitting portion” in the present invention. In the drawing, the same reference numerals as those in the first embodiment are attached to the same components as those in the first embodiment.

In the oil pump device 200 according to the second embodiment of the present invention, as shown in FIG. 7, the oil pump main body 210 is provided with a relief valve 220 that operates when the discharge pressure of the oil 1 exceeds a specified value. As shown in FIGS. 8 and 9, the relief valve 220 is attached to the valve body 221, the valve body housing portion 22 that houses the valve body 221, and the valve body 221 on the closed position side (discharge path 6 side). And an energizing spring 23.

Here, in the second embodiment, the valve body 221 is provided with a convex portion 221d for sitting. The convex portion 221d has a circular cross section, and is protruded in a rod shape (pin shape) from the center portion (region near the center line 150) of the distal end surface 221a of the valve body 221 to the discharge path 6 side. The body 221 is integrally provided. And the convex part 221d is comprised so that it may contact | abut to the inner wall surface 6b of the discharge path 6 in the casing 2 in the closed position (refer FIG. 8) of the valve body 221. FIG. The distal end surface 221a excluding the convex portion 221d of the valve body 221 is a flat surface, and the distal end surface 221a is viewed from the discharge path 6 side (hydraulic introduction hole 22b side) in the arrow Q2 direction (see FIG. 10). It has a circular outer shape. Further, in a state where the rounded tip of the convex portion 221d is in contact with the inner wall surface 6b, the tip surface 221a of the valve body 221 does not jump out from the inner wall surface 6a on the hydraulic pressure introduction hole 22b side of the discharge path 6. It is configured to be held at the same position (in the same plane) as the wall surface 6a.

As a result, in the oil pump main body 210, as shown in FIG. 8, the body 21b of the valve body 221 slides along the center line 150 with respect to the inner side surface 22a of the valve body housing part 22, so that the valve body 221 is urged in the direction of arrow Q1 by the spring 23 and moved to the closed position for closing the relief hole 22d. At this time, the convex portion 221d of the valve body 221 is seated by contacting the inner wall surface 6b. Further, as shown in FIG. 10, the valve body 221 is moved to the open position where the relief hole 22d is opened by receiving the pressure of the oil 1 in the direction of the arrow Q2 through the tip surface 221a including the convex portion 221d. Also in this case, in the relief valve 220, the flow passage cross-sectional area is not reduced because the inner diameter D2 of the hydraulic pressure introduction hole 22b is larger than the outer diameter D1 of the body 21b of the valve body 21. There is no restriction in the flow of the oil 1 passing through the hole 22b.

The convex portion 221d is also drawn in the direction of the arrow Q2 along with the movement of the valve body 221 into the hydraulic pressure introduction hole portion 22b. However, since the convex portion 221d is formed in a pin shape, from the hydraulic pressure introduction hole portion 22b to the relief hole 22d. The flow resistance of the oil 1 in this section is very slight even when compared to the case where the inner diameter D2 of the valve body accommodating portion 22 is reduced in the hydraulic pressure introducing hole portion 22b. Further, when the valve element 221 is moved to the open position, the rounded tip of the convex part 221d is configured to retreat to the inside of the valve element accommodating part 22 (hydraulic introduction hole part 22b). . That is, at the time of relief, the tip of the convex portion 221d of the valve body 221 does not protrude into the discharge path 6, and this also suppresses the occurrence of flow resistance in the oil 1 drawn into the relief path 7. . In addition, the other structure of the oil pump apparatus 200 by 2nd Embodiment is the same as that of the said 1st Embodiment.

In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the valve body 221 is integrally provided so as to protrude from the tip end surface 221a of the valve body 221 to the discharge path 6 side, and the discharge in the casing 2 is performed at the closed position of the valve body 221. The convex portion 221d is configured to contact the inner wall surface 6b of the path 6. Accordingly, the valve body 221 itself can be easily seated when the valve body 221 biased by the spring 23 is moved to the closed position by the convex portion 221d provided integrally with the valve body 221. . Further, since the relief valve 220 also has a seating function for the valve body 221 simply by incorporating the valve body 221 including the convex part 221d into the valve body accommodating part 22, the convex part 221d is configured as a separate member and incorporated in the valve body 221. Unlike the case, the relief valve 220 can be easily manufactured while suppressing an increase in the number of parts.

In the second embodiment, the valve body 221 is configured such that the tip of the convex portion 221d is positioned inside the valve body housing portion 22 in a state where the valve body 221 is moved to the open position. Thereby, since the front-end | tip part of the convex part 221d of the valve body 221 does not protrude to the discharge path | route 6 at the time of relief, the oil 1 of the discharge path | route 6 can be drawn in without trouble in the valve body accommodating part 22 (hydraulic introduction hole part 22b). . That is, it is possible to suppress flow resistance from being generated in the oil 1 drawn into the relief path 7 due to the protrusion 221d of the valve body 221 projecting into the discharge path 6 at the time of relief. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 11 and 12. In the third embodiment, unlike the first embodiment, an example in which a seating convex portion 302c is integrally provided on the casing 2 will be described. The convex portion 302c is an example of the “first convex portion” and the “sitting portion” in the present invention. In the drawing, the same reference numerals as those in the first embodiment are attached to the same components as those in the first embodiment.

As shown in FIG. 11, the oil pump device 300 according to the third embodiment of the present invention includes an oil pump main body 310 and a relief valve 320 that operates when the discharge pressure of the oil 1 exceeds a specified value. In addition, the relief valve 320 includes a valve body 21, a valve body housing portion 22 that houses the valve body 21 so as to be movable between a closed position and an open position, and a spring 23 that biases the valve body 21 toward the closed position. Contains.

Here, in the third embodiment, the casing 302 constituting the oil pump main body 310 is provided with a seating convex portion 302c. Moreover, the convex part 302c is provided in the discharge path | route 6 on the outer side of the valve body accommodating part 22, as shown in FIG. Further, the convex portion 302c has a rectangular shape (square shape) in cross section, and extends along the Y2 direction so as to intersect (orthogonally) from the casing 302 to the outer peripheral edge portion 21e of the distal end surface 21a of the valve body 21. It extends. Accordingly, the valve body 21 urged in the direction of the arrow Q1 against the pressure of the oil 1 by the spring 23 is an approximately half region in the maximum diameter direction (Y direction) of the distal end surface 21a in the closed position of the valve body 21. The flat upper surface 302d of the convex portion 302c abuts over the entire area. Thereby, when the relief valve 320 is not operating, the valve body 21 is configured to be stably seated (held) in the closed position. Further, the inner wall surface 6a without the tip surface 21a jumping out from the inner wall surface 6a on the hydraulic pressure introduction hole 22b side of the discharge path 6 in a state where the tip surface 21a of the valve body 21 is in contact with the flat upper surface 302d of the convex portion 302c. Are held at the same position (in the same plane). The casing 302 is an example of the “first housing” in the present invention.

Thereby, in the oil pump main body 310, as shown in FIG. 11, when the valve body 21 slides with respect to the valve body accommodating part 22, the valve body 21 is moved to the closed position which closes the relief hole 22d. . At this time, the valve body 21 is seated by the front end surface 21a coming into contact with the convex portion 302c (upper surface 302d). Further, as shown in FIG. 12, the valve body 21 is moved to the open position where the relief hole 22d is opened by receiving the pressure of the oil 1 through the tip surface 21a excluding the portion where the convex portion 302c abuts. Also in this case, in the relief valve 320, the flow passage cross-sectional area is not reduced because the inner diameter D2 of the hydraulic pressure introduction hole portion 22b is larger than the outer diameter D1 of the body portion 21b of the valve body 21. There is no restriction in the flow of the oil 1 passing through the hole 22b. In addition, the other structure of the oil pump apparatus 300 by 3rd Embodiment is the same as that of the said 1st Embodiment.

In the third embodiment, the following effects can be obtained.

In the third embodiment, as described above, the convex portion 302c is provided integrally with the casing 302 constituting the oil pump main body 310. Thereby, unlike the case where the convex portion 302 c is configured as a separate member from the casing 302, a part of the casing 302 also functions as a seating portion of the valve body 21, so that the number of parts of the oil pump main body 310 increases. Can be suppressed.

Moreover, in 3rd Embodiment, while extending so that the outer-periphery edge part 21e of the front end surface 21a of the valve body 21 may cross | intersect, from the outer-periphery edge part 21e of the front end surfaces 21a of the valve body 21 in the closed position of the valve body 21. The convex portion 302c is arranged so as to be in contact with the inner portion. Thereby, the valve body 21 can be stably received using both the outer peripheral edge part 21e and the inner part of the front end surface 21a of the moving valve body 21 using the convex part 302c. Thereby, the valve body 21 can be easily and reliably seated at the closed position. The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 3 and 13. In the fourth embodiment, unlike the first embodiment, an example will be described in which the relief valve 420 is configured using a valve body 421 in which a concave portion 421f recessed inwardly is formed on the tip end surface 421a. In the figure, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

In the oil pump device 400 according to the fourth embodiment of the present invention, as shown in FIG. 13, the oil pump main body 410 is provided with a relief valve 420 that operates when the discharge pressure of the oil 1 exceeds a specified value. In addition, the relief valve 420 includes a valve body 421, a valve body housing portion 22 that houses the valve body 421, and a spring 23 that biases the valve body 421 toward the closed position. The oil pump main body 410 is sandwiched with a pin 30 for positioning the casing 2 and the cover 3, and the pin 30 is used in the same manner as in the first embodiment, when the relief valve 420 is not in operation. The body 421 is configured to be seated at a predetermined position (closed position).

Here, in 4th Embodiment, the front end surface 421a of the valve body 421 has the recessed part 421f dented inside. That is, the surface area of the distal end surface 421a including the recess 421f is larger by the amount of the recess 421f than the distal end surface 21a (see FIG. 3) of the valve body 21 of the first embodiment. A recess 21c into which the spring 23 is fitted is formed on the opposite side (arrow Q2 side) of the recess 421f. In addition, the distal end surface 421a of the valve body 421 is formed in a flat and annular shape (ring shape) only in the outer peripheral edge portion 421e excluding the concave portion 421f.

Further, the pin 30 extends along the Y1 direction (Y2 direction) so as to intersect (orthogonally) the outer peripheral edge portion 421e of the distal end surface 421a of the valve body 421. In this case, the pin 30 extends from the outer peripheral edge portion 421e on the Y1 side of the tip end surface 421a to the outer peripheral edge portion 421e on the Y2 side across the concave portion 421f. Accordingly, the valve body 421 urged in the direction of the arrow Q1 against the pressure of the oil 1 by the spring 23 is, when the valve body 421 is closed, the outer peripheral edge portion 421e on the Y1 side and the outer peripheral edge portion 421e on the Y2 side. In both cases, the side surface 30a around the central axis of the pin 30 abuts. Thereby, when the relief valve 420 is not operated, the valve body 421 is stably seated (held) in the closed position. In addition, the other structure of the oil pump apparatus 400 by 4th Embodiment is the same as that of the said 1st Embodiment.

In the fourth embodiment, the following effects can be obtained.

In the fourth embodiment, as described above, the concave portion 421f that is recessed inwardly is formed on the distal end surface 421a of the valve body 421, and the distal end surface 421a of the valve body 421 is only the outer peripheral edge portion 421e excluding the concave portion 421f. It is flat and formed in an annular shape (ring shape). And in the closed position of the valve body 421, it comprises so that the side surface 30a around the center axis | shaft of the pin 30 may contact | abut both in the outer periphery part 421e by the side of Y1, and the outer periphery part 421e by the side of Y2. As a result, even if the recess 421f is provided on the distal end surface 421a, the valve body 421 can be stably seated (held) in the closed position when the relief valve 420 is not operating. The remaining effects of the fourth embodiment are similar to those of the aforementioned first embodiment.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 3 and 14. In the fifth embodiment, unlike the first embodiment, an example in which the pin 530 is provided in the hydraulic pressure introducing hole 22b of the valve body housing portion 22 will be described. The pin 530 is an example of the “sitting part” in the present invention. In the drawing, the same reference numerals as those in the first embodiment are attached to the same components as those in the first embodiment.

In the oil pump device 500 according to the fifth embodiment of the present invention, as shown in FIG. 14, the oil pump main body 510 is provided with a relief valve 20 that operates when the discharge pressure of the oil 1 exceeds a specified value. Further, a pin 530 for positioning the casing 2 and the cover 3 is sandwiched in the oil pump main body 510, and the valve body 21 is seated at a predetermined position when the relief valve 20 is not operated by using the pin 530. It is configured as follows.

Here, in 5th Embodiment, the hole 2b (refer FIG. 3) of the casing 2 and the hole 3b (refer FIG. 3) of the cover 3 are not in the discharge path | route 6, but the valve body accommodating part 22 side from the discharge path | route 6. Is formed at a position where it slightly enters (in the vicinity of the hydraulic pressure introduction hole 22b). Accordingly, the pin 530 on which the valve body 21 is seated is configured to be disposed at a position where it slightly enters the hydraulic pressure introduction hole 22b in the shaft hole-like valve body housing part 22. Therefore, when the relief valve 20 is not in operation, the pin 530 is not disposed in the flow of the oil 1 flowing through the discharge path 6.

Note that the pin 530 has a smaller outer diameter than the pin 30 (see FIG. 3). Accordingly, the oil 1 in the discharge path 6 is drawn in the direction of the arrow Q2 along with the movement of the valve body 21 into the hydraulic pressure introduction hole 22b, but the pin 530 is disposed because it is formed in an elongated bar shape. Even in this case, the flow resistance of the oil 1 in the section from the hydraulic pressure introduction hole 22b to the relief hole 22d is compared with the case where the inner diameter D2 of the valve body accommodating portion 22 is reduced in the hydraulic pressure introduction hole 22b. But it is very slight. In addition, the other structure of the oil pump apparatus 500 by 5th Embodiment is the same as that of the said 1st Embodiment.

In the fifth embodiment, the following effects can be obtained.

In the fifth embodiment, as described above, the pin 530 is provided inside the valve body housing portion 22. In this case, a thin rod-like pin 530 is disposed at a position (near the hydraulic pressure introduction hole 22b) that slightly enters the valve body housing portion 22 side from the discharge path 6. As a result, even if the pin 530 is disposed in the vicinity of the hydraulic pressure introduction hole 22b, the inner diameter D2 of the valve body accommodating portion 22 is not reduced and the flow path cross-sectional area is not reduced. It does not affect the flow resistance of the oil 1 in the section from 22b to the relief hole 22d. Further, when the relief valve 20 is not in operation, the pin 530 is not arranged in the flow of the oil 1 flowing through the discharge path 6, so that the flow state of the oil 1 flowing through the discharge path 6 is attributed to the arrangement of the pins 530. It can be easily prevented from being disturbed. The remaining effects of the fifth embodiment are similar to those of the aforementioned first embodiment.

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

For example, in the first embodiment and the modification of the first embodiment, an example in which the pin 30 is provided outside the valve body housing portion 22 (in the discharge path 6) is shown, and in the fifth embodiment, the pin 530 is provided. Although the example provided in the hydraulic pressure introduction hole 22b of the valve body accommodating part 22 was shown, this invention is not limited to this. For example, depending on the configuration of the oil pump device, the relief valve 20 may be provided at a position further recessed from the discharge path 6 by design. That is, it is assumed that a flow path (pipe) having a predetermined length for drawing the oil 1 between the discharge path 6 and the valve body housing part 22 (hydraulic introduction hole 22b) is separately provided inside the oil pump body. . Even in such a case, the “pin” or “sitting portion” of the present invention is arranged outside the valve body housing portion 22 and in the flow path between the discharge path 6 and the valve body housing portion 22. An oil pump device may be configured.

In the second embodiment, the example in which the convex portion 221d is provided integrally with the valve body 221 has been described, but the present invention is not limited to this. For example, a convex component having a shape similar to the convex portion 221d is formed as a separate member, and the valve body is formed by attaching the convex component to the distal end surface 221a of the valve body 221 to constitute the entire relief valve. May be.

In the second embodiment, the example in which the convex portion 221d is brought into contact with the inner wall surface 6b of the discharge path 6 in the casing 2 at the closed position of the valve body 221 has been shown, but the present invention is not limited to this. That is, the oil pump main body may be configured such that the cover 3 side bears a part of the discharge path 6 with the cover 3 attached to the casing 2. In such a configuration of the oil pump main body, the convex portion 221 d (second convex portion) of the valve body 221 may abut on the inner wall surface 6 b of the discharge path 6 in the cover 3.

In the second embodiment, the example in which the convex portion 221d is provided integrally with the valve body 221 has been described, but the present invention is not limited to this. For example, a convex portion (protrusion) that includes the valve body 21 in the first embodiment and projects in the direction of the arrow Q2 from the inner wall surface 6b (see FIG. 8) of the discharge path 6 toward the valve body 21 having a flat front end surface 21a. Part) may be provided. In the closed position of the valve body 21, the oil pump device is placed so that the front end surface 21 a of the valve body 21 contacts and seats on a convex portion (protrusion) that protrudes from the inner wall surface 6 b toward the valve body 21. It may be configured.

In the third embodiment, the example in which the convex portion 302c is integrally provided in the casing 302 constituting the oil pump main body 310 has been described, but the present invention is not limited to this. For example, instead of providing the convex portion 302 c on the casing 302, the “first convex portion” of the present invention may be integrally provided on the cover 3 constituting the oil pump main body 310.

In the third embodiment, the example in which the convex portion 302c is integrally provided in the casing 302 constituting the oil pump main body 310 has been described, but the present invention is not limited to this. For example, in addition to the convex portion 302 c on the casing 302 side, the “first convex portion” of the present invention may be integrally provided on the cover 3 constituting the oil pump main body 310. That is, the valve body 21 is seated by a pair of “first protrusions” extending from the opposite sides of the valve body 21 along the Y direction toward the central portion of the valve body 21 (tip surface 21a). An oil pump device may be configured.

In the first embodiment and the modification of the first embodiment, an example in which the pin 30 is provided outside the valve body housing portion 22 (in the discharge path 6) is shown. In the fifth embodiment, the pin 530 is provided. Although the example provided in the hydraulic pressure introduction hole 22b of the valve body accommodating part 22 was shown, this invention is not limited to this. For example, the oil pump device may be configured so that the “pin” or “sitting portion” of the present invention is disposed in a boundary region that straddles both the hydraulic pressure introduction hole 22 b and the discharge path 6.

In the second and fifth embodiments, the example in which the casing 2 is configured to have the same inner diameter D2 in the section from the hydraulic pressure introduction hole 22b to the relief hole 22d of the relief path 7 has been described. Is not limited to this. That is, the casing 2 may be configured so that the inner diameter D2 gradually increases toward the discharge path 6 in the hydraulic pressure introduction hole 22b that opens to the discharge path 6. According to this modification, even if the convex portion 221d is formed on the valve body 221, or the pin 530 is disposed at the position where the pin 530 enters the hydraulic pressure introduction hole 22b, the hydraulic pressure introduction hole 22b. The flow path (flow path cross-sectional area) of the oil 1 can be appropriately secured. Thereby, the flow resistance of the oil 1 in the area from the oil pressure introduction hole 22b to the relief hole 22d can be further reduced.

In the third embodiment, the example in which the valve body 21 is seated using the convex portion 302c having a rectangular shape (square shape) is shown, but the present invention is not limited to this. For example, the “sitting portion” of the present invention may be configured using a convex portion having an elliptical or elongated hole cross section. In this case, it is preferable to form the convex portion so that the major axis direction in the cross section of the convex portion is along the direction in which the oil 1 flows through the valve body housing portion 22 during relief (the direction of the arrow Q2). Thereby, even if a convex part (sitting part) is arrange | positioned on the outer side rather than the valve body accommodating part 22, the flow resistance of the oil 1 at the time of being drawn in into the hydraulic pressure introduction hole part 22b can further be reduced.

In the second to fifth embodiments, the oil pump devices 200 to 500 are configured to have an internal relief structure in which the oil 1 flowing through the relief path 7 is returned to the suction port 4. The invention is not limited to this. That is, as in the case of the oil pump device 150 in the modified example of the first embodiment shown in FIG. 6, the other end (return port) of the relief path 7 a has an outer relief structure arranged on the oil pan 91. In addition, the oil pump device in each embodiment may be configured.

In the first to fifth embodiments and the modification of the first embodiment, the valve body 21 (221) is configured so that the cross section parallel to the tip surface 21a (221a) has a circular shape (annular shape). Although an example has been shown, the present invention is not limited to this. That is, the relief valve may be configured using a valve body having a polygonal shape other than a circular cross section.

Further, in the first to fifth embodiments and the modified example of the first embodiment, an example in which only one relief hole 22d having a predetermined inner diameter is provided on the inner side surface 22a of the valve body housing portion 22 is shown. The present invention is not limited to this. A plurality of relief holes are provided radially on the inner side surface 22a of the valve body accommodating portion 22, and a flow path extending from the plurality of relief holes serves as one or a plurality of relief paths 7 in the suction port 4 or the oil pan 91. The oil pump device may be configured to be connected. Further, one relief hole 22d may be provided with a continuous annular shape or a partial arc shape along the inner side surface 22a. According to this modification, the flow of the oil 1 is uniformly formed around the inner side surface 22a of the valve body housing portion 22 at the time of relief, so that the relief operation of the valve body 21 can be performed more smoothly. .

Further, in the first to fifth embodiments and the modified examples of the first embodiment, the example in which the valve body accommodating portion 22 is formed in the shape of a shaft hole having one inner diameter D2 is shown. Not limited to. The valve body housing portion only needs to have the same inner diameter D2 in at least a section from the hydraulic pressure introduction hole portion to the relief hole of the relief path. For example, a spring that is outside the movable range of the valve body 21 in the valve body housing portion. The portion in which 23 is inserted may have an inner diameter different from the inner diameter of the hydraulic pressure introduction hole. As described above, outside the movable range of the valve body 21, a stepped process or the like may be applied to the valve body housing portion.

In the first to fifth embodiments and the modification of the first embodiment, the oil pump body 10 is shown as an example of a trochoid oil pump that is an inscribed gear type. Not limited. In the internal gear type, the oil pump main body may be configured by applying an inscribed involute tooth mold. The oil pump main body may be configured not only as an internal gear type but also as an external gear type oil pump having a circumscribed involute tooth shape or a vane type oil pump, for example. Further, the present invention may be applied to a variable displacement type oil pump device configured such that the oil discharge amount is variable according to the eccentric amount of the outer rotor with respect to the inner rotor.

In the first to fifth embodiments and the modification of the first embodiment, the oil 1 when the relief valve 20 (220, 320, 420, 520) is operated at a predetermined rotational speed of about 2200 revolutions / minute or more. Although an example in which the oil pump devices 100 to 500 are configured so that the relief amount is constant is shown, the present invention is not limited to this. The present invention may be applied to an oil pump device including a variable displacement type relief valve in which the relief amount of the oil 1 is variable depending on the movement position of the relief valve even at the same rotational speed.

In the first to fifth embodiments and the modified examples of the first embodiment, examples in which the present invention is applied to the oil pump devices 100 to 500 that supply oil (engine oil) 1 to the engine 90 are shown. The present invention is not limited to this. For example, the present invention may be applied to an oil pump device for supplying AT fluid (AT oil) to an automatic transmission (AT) that automatically switches the gear ratio according to the rotational speed of the internal combustion engine. Further, unlike the AT (multi-stage transmission) that changes gears by changing the gear combination, the lubricating oil is supplied to the sliding portion in the continuously variable transmission (CVT) capable of changing the gear ratio continuously and continuously. You may apply this invention to the oil pump apparatus for this. Further, the present invention may be applied to an oil pump device for supplying power steering oil to a power steering device that drives a steering (steering device) in a vehicle. With the increasing number of functional parts that require hydraulic drive in vehicles (automobiles), there are many cases where the oil pump main body must be enlarged as the hydraulic system becomes more complex and longer. An increase in the size of the oil pump body driven by the internal combustion engine tends to increase the oil discharge pressure, including during cold start, but the relief performance is improved (improved) by applying the present invention. It is possible to eliminate potential disadvantages associated with the increase in size of the pump body. Therefore, an increase in size of the oil pump main body can be permitted.

In the first to fifth embodiments and the modification of the first embodiment, the example in which the oil pump devices 100 to 500 are mounted on a vehicle such as an automobile provided with the engine 90 has been shown. Not limited. For example, you may apply this invention with respect to the oil pump apparatus mounted in equipment other than the vehicle provided with the internal combustion engine (engine). Moreover, as an internal combustion engine, a gasoline engine, a diesel engine, a gas engine, etc. are applicable.

1

Oil

2, 302 Casing (first housing)
3 Cover (second housing)
4 Intake port 5 Discharge port 6

Discharge path

6a, 6b

Inner wall surface

7,

7a Relief path

10, 110, 210, 310, 410, 510 Oil pump body 11 Inner rotor 12

Outer rotor

20, 220, 320, 420

Relief valves

21, 221, 421

Valve body

21a, 221a, 421a Front end surface 21b Body portion 21c Recessed

portion

21e, 421e Outer peripheral edge portion 22 Valve body accommodating portion 22a Inner side surface 22b Hydraulic pressure introduction hole portion 22d Relief hole 23 Spring (biasing member)
30, 530 pin (sitting part)

30a Side surface

100, 150, 200, 300, 400, 500 Oil pump device 221d Convex part (second convex part, seating part)
302c Convex part (first convex part, seating part)
421f recess

Claims

An oil pump body that sucks and discharges oil;
A relief valve that is provided in the discharge path of the oil pump body and opens and closes the relief path according to the pressure of the discharge path,
The relief valve is
A valve body for opening and closing the relief path;
A valve body container for movably accommodating the valve body between a closed position and an open position;
A biasing member that biases the valve body toward the closed position;
A seating portion for seating the valve body biased by the biasing member in a closed position;
The said valve body accommodating part is an oil pump apparatus which is provided in the edge part by the side of the said discharge path | route, and has a hydraulic introduction hole part which has an internal diameter larger than the outer diameter of the trunk | drum of the said valve body.
The oil pump device according to claim 1, wherein the valve body housing portion has the same inner diameter at least in a portion from the hydraulic pressure introduction hole portion to a relief hole of the relief path.
The oil pump device according to claim 1 or 2, wherein a distal end surface of the valve body is a flat surface and has a circular outer shape when viewed from the discharge path side.
The oil pump device according to any one of claims 1 to 3, wherein the seating portion is provided outside the valve body housing portion.
The oil pump device according to claim 4, wherein the seating portion is provided in the discharge path outside the valve body housing portion.
The oil pump device according to any one of claims 1 to 3, wherein the seating portion is provided in a region in the vicinity of the hydraulic pressure introduction hole portion inside the valve body housing portion.
The oil pump device according to any one of claims 1 to 6, wherein the seating portion has a circular cross section.
The oil pump device according to any one of claims 1 to 7, wherein the seating portion is configured to be in contact with at least a portion inside an outer peripheral edge portion of a tip end surface of the valve body.
The seating portion extends so as to intersect with the outer peripheral edge portion of the front end surface of the valve body, and abuts on a portion inside the outer peripheral edge portion of the front end surface of the valve body at the closed position of the valve body. The oil pump device according to claim 8, comprising a pin or a first convex portion arranged in such a manner.
The seating part is the pin,
The oil pump device according to claim 9, wherein the pin has a function of positioning the first housing and the second housing constituting the oil pump main body in addition to the function as the seating portion.
The pin extends along an inner wall surface of the discharge path on the hydraulic pressure introduction hole side so as to cross the hydraulic pressure introduction hole portion to constitute the seating portion, and an end portion of the pin is the first housing 11. The structure according to claim 10, wherein the first housing and the second housing are relatively positioned by being inserted into positioning holes formed in each of the second housings. Oil pump device.
The seating portion is the first convex portion,
10. The oil pump device according to claim 9, wherein the first convex portion is provided integrally with one of a first housing and a second housing constituting the oil pump main body.
The seat portion is provided integrally with the valve body so as to protrude from the distal end surface of the valve body toward the discharge path, and a first housing constituting the oil pump main body at a closed position of the valve body or The oil pump device according to any one of claims 1 to 5, further comprising a second convex portion that abuts against an inner wall surface of the second housing.
The oil pump device according to claim 13, wherein the valve body is configured such that a distal end portion of the second convex portion is positioned inside the valve body housing portion in a state where the valve body is moved to an open position. .
A valve body that is provided in a discharge path for discharging oil, and that opens and closes a relief path according to the pressure of the discharge path;
A valve body container for movably accommodating the valve body between a closed position and an open position;
A biasing member that biases the valve body toward the closed position;
A seating portion for seating the valve body biased by the biasing member in a closed position;
The said valve body accommodating part is a relief valve provided in the edge part by the side of the said discharge path | route, and contains the hydraulic introduction hole which has an internal diameter more than the outer diameter of the trunk | drum of the said valve body.