JP2022516609A - Vane pump with hollow pivot pin with fasteners - Google Patents

Abstract

Centered inside the housing between the housing, a pivot pin with a hollow portion mounted inside the housing, and a first slide position and a second slide position to regulate the discharge of the pump through the outlet. A control slide that is displaceable as a cover, and a cover that is attached to the housing via a fastener that passes through the pivot pin so that the control slide rotates about the housing and the cover with respect to the pivot pin. Vane pumps are disclosed, including. In one embodiment, the fasteners pass to the engine mount. Pivot pins do not create fluid passages through hollow sections.

Description

Cross-reference to related applications This application claims priority to US Provisional Patent Application No. 62 / 785,960 filed December 28, 2018, the subject matter of which is incorporated herein by reference in its entirety.

The present disclosure relates generally to vane pumps. More specifically, the present disclosure relates to pivot pins and assembly of vane pumps.

Vane pumps are known to be used to pump fluids or lubricants such as automobile oil. The vane pump contains vanes that move radially with respect to the rotor mounted eccentrically inside the housing. The movement of the rotor and vanes creates one or more control chamber volumes within which the fluid can be pressurized and further discharged through the outlet of the pump. The vane pump may include a single control chamber or two control chambers for moving the lubricant.

One aspect of the present disclosure provides a vane pump, which comprises a housing, a pivot pin having a hollow portion mounted inside the housing, and a first slide position and a first slide position to regulate the discharge of the pump through the outlet. A control slide that can be displaced about the pivot pin inside the housing between the two slide positions and a cover that rotates the pivot pin with respect to the housing and cover so that the control slide rotates about the pivot pin. Includes a cover, which is attached to the housing via a passing fastener. Pivot pins do not create fluid passages through hollow sections.

Other aspects and features of the present disclosure will become apparent from the following detailed description, accompanying drawings, and the appended claims.

The accompanying drawings that are incorporated into and constitute a portion of this specification illustrate one or more embodiments, and together with the description of the specification, these embodiments are described. The attached drawings are not always drawn on a fixed scale. Any values of the dimensions illustrated in the accompanying graphs and drawings are for illustrative purposes only and may or may not represent actual or preferred values or dimensions. Where applicable, some or all features may not be exemplified to aid in the explanation of the features below.

FIG. 3 is a first perspective view of a vane pump according to an embodiment of the present disclosure.

FIG. 2 is a second perspective view of a vane pump according to an embodiment of the present disclosure.

FIG. 1B is an exploded view of the vane pumps of FIGS. 1A and 1B according to an embodiment of the present disclosure.

FIG. 6 is a diagram of a vane pump showing the arrangement of control slides with the cover removed, according to an embodiment of the present disclosure.

FIG. 3 is a projection of a vane pump showing the assembly of bolts to an engine block according to an embodiment of the present disclosure.

FIG. 6 is a projection view when viewed from a cover according to an embodiment of the present disclosure.

It is sectional drawing which passes through the cutting line AA of FIG. 5A.

Various projection views of the vane pump according to an embodiment of the present disclosure, such as top view, front view, bottom view, and side view, respectively. Various projection views of the vane pump according to an embodiment of the present disclosure, such as top view, front view, bottom view, and side view, respectively. Various projection views of the vane pump according to an embodiment of the present disclosure, such as top view, front view, bottom view, and side view, respectively. Various projection views of the vane pump according to an embodiment of the present disclosure, such as top view, front view, bottom view, and side view, respectively.

The description of the specification described below in connection with the accompanying drawings is intended to be a description of various embodiments of the subject matter disclosed and is not necessarily intended to represent the sole embodiment. In some cases, the description of the specification includes specific details for the purpose of providing an understanding of the disclosed embodiments. However, it will be apparent to those skilled in the art that the disclosed embodiments may be practiced without their specific details. In some cases, well-known structures and components may be presented in the form of block diagrams to avoid obscuring the concept of the disclosed subject matter.

References to "one embodiment" or "an embodiment" throughout the specification are at least one embodiment of a subject in which a particular feature, structure, or property described in connection with an embodiment is disclosed. Means to be included in the form. Therefore, the appearance of the phrase "in one embodiment" or "in one embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Moreover, specific features, structures, or properties may be combined in any suitable manner in one or more embodiments. Further, embodiments of the disclosed subject matter are intended to cover modifications and variations thereof.

Terms such as "inside" and "outside" that may be used herein merely describe reference points and do not necessarily limit the embodiments of the present disclosure to any particular orientation or configuration. Is understood. In addition, terms such as "first," "second," "third," etc., include some parts, components, steps, actions, functions, and / or as disclosed herein. It only identifies one of the reference points and similarly limits the embodiments of the present disclosure to any particular configuration or orientation, or any requirement that each number must be included. Do not mean.

1A and 1B are a first perspective view (when viewed from the housing side) and a second perspective view (when viewed from the cover side) of the vane pump 100 in an embodiment of the present disclosure. In one embodiment, the vane pump 100 is a variable vane pump with a large number of chambers. The vane pump 100 has a housing 12 and a cover 2 attached to the housing 12. The cover 2 is attached to the housing 12, for example, via fasteners 26 and 27 inserted into various fastener bores provided along the perimeter of the cover 2 and the housing 12. Some internal components of the vane pump 100 (eg, vane 7, rotor 5, pivot pin 4, etc. shown in FIG. 2) are encapsulated between the housing 12 and the cover 2. The vane pump 100 further includes a valve controller 18 housed inside the housing 12. The internal components of the vane pump 100 are not visible in FIGS. 1A and 1B, but are shown in the exploded view of the vane pump 100 of FIG.

The housing 12 (eg, in FIGS. 1A-1B and 2) has an inlet 28 for receiving fluid into the housing 12 and an outlet 29 for discharging or delivering pressurized fluid to a system, eg, an engine. Have. The housing 12 may be made of any material and may be formed by die casting aluminum, cast iron, or any other known manufacturing technique. The housing 12 encapsulates an internal chamber, such as a first control chamber 126 and possibly a second chamber 127, between the housing 12 and the control slide 25 (shown in FIG. 3) to provide a second chamber 127. Pressurized fluid or vent pressure can be selectively received through. In one embodiment, the first control chamber 126 and the second chamber 127 are on either side of the pivot pin 4 (shown in FIGS. 2 and 3) and are isolated from each other. The first chamber 126 may always have feedback pressure and the second chamber 127 may have pressure or be ventilated, depending on the valve controller 18. In other words, the first chamber 126 and the second chamber 127 are not fluidly connected around the pivot pin 4. The first control chamber 126 receives the pressurized fluid and moves the control slide 25 to reduce its eccentricity with respect to the rotor 5 to reduce the pump discharge. Another chamber 128 is connected to the outlet portion and outlet of the pump, which allows, for example, outlet oil to pass above and / or below the slide 25. Yet another chamber 124 is connected to the inlet to help limit leakage from chambers 126 and 127. The housing 12 may include a chamber for accommodating the valve controller 18, which may be configured to deliver the pressurized fluid from the first chamber 126 of the pump. The valve controller 18 may be connected to the housing 12 via a clip 19.

The cover 2 may be made of any material and may be formed by aluminum die casting, powder metal forming, forging, or any other desired manufacturing technique. A gasket or other seal can optionally be provided between the cover 2 and the peripheral wall of the housing 12 to seal the internal chamber. The housing 12 and cover 2 include various surfaces (eg, slide seal 14 and slide seal support 13 in FIG. 2) to accommodate the movement and seal engagement of the control slide 25.

FIG. 2 is an exploded view of the vane pump 100 showing the internal components of the pump arranged between the cover 2 and the housing 12. For example, the internal components are a dowel pin 3 (for aligning components such as the cover 2 and the housing 12), a pivot pin 4 connected to a control slide 25, a rotor 5, and two vanes on either side of the rotor 5. A ring 6, a plurality of vanes 7 (collectively referred to as vanes 7), a control slide 25 assembled with a slide seal support 13 and a slide seal 14, a spring 15, and a relief ball 11, a relief spring 10, a cup plug 9, and a sir. Includes a relief mechanism, including clip 8.

Referring to FIGS. 2 and 3, the control slide 25 is displaceable with respect to the cover 2 inside the housing 12. For example, the control slide 25 can occupy a first slide position, a neutral / default position, and a second slide position to regulate the discharge of the vane pump 100 through the outlet. In one embodiment, the control slide 25 is swivelly mounted (eg, around the pivot pin 4) and has a minimum displacement between the first slide position and the second slide position (eg, from its neutral position). (To the position) It is configured to rotate and displace inside the housing 12. More specifically, this may include any number of positions away from the first slide position, including the case where the slide is close to the minimum displacement position in one embodiment, or with the minimum displacement position. can do. The control slide 25 may be swivelly mounted inside the housing 12 with respect to the first control chamber 126 and the second control chamber 127.

The first control chamber 126 is provided in the housing 12 in relation to the first side of the control slide 25, which is provided on one side of the pivot pin 4, and the second chamber 127 is the other of the pivot pins 4. It is provided on the opposite second side of the control slide 25, which is provided on one side. In certain embodiments, chambers 126 and 127 are isolated from each other and do not communicate with each other (eg, fluidly). Chambers 126 and 127 are not connected to each other and chamber 127 is connected to the inlet. A positive pressure of force from the pressurized lubricant may be applied to or supplied to the control chamber 126, which directs the slide 25 towards its second slide position (or second swivel direction). Move in the second direction opposite to the first direction to reduce the pump output flow (ie, by reducing the degree of eccentricity). The pressure can be fed back from the outlet side of the pump or from an external system.

Specifically, in certain embodiments where the control slide 25 is swiveled, a pivot pin 4 or similar feature may be provided to guide the swiveling motion of the control slide 25. In certain embodiments, the pivot pin 4 may be rotatably mounted on the housing 12 and cover 2, and the control slide 25 may be secured to the pivot pin so that the pivot pin 4 and, as a result, the control slide 25 are. , Can freely rotate or rotate within the cover 2 and the housing 12. The configuration of the swivel connection of the control slide 25 within the housing 12 is not limited. In one embodiment, the control slide 25 is rotationally fixed to the pivot pin 4 so as to rotate along an axis. More specifically, in certain embodiments, the pivot pin 4 is designed to be press-fitted into the opening of the control slide 25. The outer surface of the pivot pin 4 may be connected to and / or in contact with, for example, the surface of the control slide 25.

In certain embodiments, the pivot pin 4 may be fixed to the housing 12 and cover 2 (eg, by press fitting) and the control slide 25 may rotate freely about the pivot pin 4.

Pivot pins 4 (shown in FIGS. 2, 3, 4, 5A-5B and 6A-6D) are for receiving fastening devices (compatiblely referred to as fasteners) such as bolts, shafts and screws. A hollow pin with an open end. The pivot pin 4 has a substantially cylindrical shape in the form of a hollow, tubular cylinder. In one embodiment, the pivot pin 4 provides a structure for the fastening device (eg, bolt 21), which provides additional means for fastening, for example, the cover 2 to the engine block in this case. To enable or otherwise, the cover 2 may be bolted to the housing 12 without creating additional fastening structures such as fastening holes on the housing 12 and / or the cover 2. Thus, the pivot pin 4 saves space and creates a small vane pump design. In certain embodiments, the additional bolt 21 prevents a gap from being formed between the cover 2 and the housing 12, thus preventing fluid from leaking through the gap. The outer surface of the pivot pin 4 (ie, the circumferential surface) may not have any holes or grooves, so that the fluid may flow from the chamber (eg, 126) around the pivot pin 4 to the hollow portion 4a of the pivot pin (eg, 126). (See Fig. 3) cannot be entered. In certain embodiments, the hollow portion 4a of the pivot pin 4 may be threaded to accommodate threading of the fastening device (eg, bolt 21).

When the fastening device (eg, bolt 21) is inserted through the pivot pin 4, the hollow portion and the open end are substantially closed and do not provide a fluid passage through the hollow portion of the pivot pin 4. Therefore, during operation, fluid inside or around the vane pump 100 cannot flow through the pivot pin 4. In one embodiment, the fastening device is not in contact with the fluid inside the housing 12. In one embodiment, the bolt 21 is inserted into the hollow portion of the pivot pin 4 through the housing 12 (see FIGS. 1A, 4, 5A, 6A, 6C-6D) and cover 2 (FIGS. 1B, 5B). , And further outward from FIGS. 6A-6D) to allow nut attachment. In certain embodiments, the nut provides a means of providing variable pressure for tightening (or disconnecting) the cover 2 against the housing 12. Further, as shown in the cross-sectional view of FIG. 5B, the pivot pin 4 partially extends through the cover 2 and is partially enclosed inside the housing 12, so that the hollow portion is formed between the housing 12 and the cover 2. Inaccessible to the fluid trapped in between. Therefore, no fluid passage is created through the hollow portion of the pivot pin 4.

Further, the pivot pin 4 passes, for example, as described above, through the hollow portion and / or on both sides of the pin 4 inside the housing 12 in which the chambers 127 and 126 (shown in FIG. 3) are located. The second chamber 127 remains isolated from the control chamber 126 as the pivot pin 4 does not create a fluid passage for it. The pivot pin 4 also provides a positioning dowel for mounting the pump on the engine block.

In one embodiment, the control slide 25 rotates about a pivot pin 4 (eg, shown in FIG. 3) to change the position and movement of the rotor 5 and vane 7 with respect to the inner surface of the control slide 25, thus. The discharge of the pump and the distribution of the fluid through the outlet are varied without allowing the fluid to pass through the hollow portion of the pivot pin 4. The spring 15 urges or propels the control slide 25 in a first direction towards its first slide position (or first turning direction or position, or maximum displacement position). While the control slide 25 swirls from the first position to the second position, the fluid can be pressurized without passing through the hollow portion of the pivot pin 4.

Referring to FIG. 3, the rotor 5 has one radial vane 7 mounted on the rotor 5 so as to move radially. Specifically, each vane 7 is fitted with a proximal end in a radial slot in the center ring 6 of the rotor 5 so that they can be slid radially. Centrifugal force pushes the vane 7 radially outward during rotation of the control slide to engage and / or engage between the distal end of the vane 7 and the internal or inner surface of the control slide 25. Can be maintained. This type of mounting is conventional and well known. In certain embodiments, other variations may be used, such as a spring in a slot for urging the vane radially outward, without limiting the scope of the disclosure.

The spring 15 (shown in FIGS. 2 and 3) can be a coil spring or a leaf spring. In certain embodiments, the spring 15 is used to urge and / or return the control slide 25 to its default or urging position (eg, the default position of maximum eccentricity with the rotor 5). The control slide 25 can be moved to resist the spring 15 to reduce the eccentricity with the rotor 5 based on the pressure inside the outlet of the vane pump 100 in order to regulate the discharge and thus the output flow.

The seal 14 (shown in FIG. 2) and the slide seal support 13 help the control slide 25 move between its slide positions along the wall of the housing 12, and still maintain the seal to the housing 12. The seal 14 also helps limit leakage back to chamber 124 from each of chambers 126, 127, 128.

The cage 16 and screen 17 are also included in the housing 12 (see FIG. 2). The screen 17 filters the inlet and the cage 16 keeps the seal in place.

In certain embodiments, screws 26, 27 may be used to attach the cover 2 to the housing 12. The housing 12 includes a corresponding threaded hole to receive the screws 26, 27. In certain embodiments, the screws 26, 27 may be attached around the cover 2 and the housing 12 without passing through or contacting the internal components of the housing, such as the control slide 25. In certain embodiments, the screws 26, 27, when assembled with the housing 12, can be flush with the surface of the cover 2 (ie, do not protrude from the surface).

Although the principles of the present disclosure have been demonstrated in the exemplary embodiments described above, various modifications can be made to the structures, arrangements, proportions, elements, materials, and components used in the practice of the present disclosure. That will be clear to those skilled in the art.

Therefore, it can be seen that the features of the present disclosure have been sufficiently and effectively achieved. However, the preferred specific embodiments described above are illustrated and described for the purpose of exemplifying the functional and structural principles of the present disclosure and are subject to change without departing from such principles. It will be recognized that there is. Accordingly, this disclosure includes all modifications within the spirit and scope of the following claims.

Claims (3)

It ’s a vane pump,
With the housing
A tubular pivot pin with a hollow portion mounted inside the housing,
A control slide mounted on the pivot pin so that it is displaced within the housing between a first slide position and a second slide position to adjust the discharge of the pump through the outlet.
Includes a cover attached to the housing via a fastener that passes through the pivot pin.
The pivot pin is a vane pump that does not create a fluid passage through the hollow portion. The control chamber on the first side of the control slide and
Further comprising a second chamber on the second side of the control slide, which lies between the housing and the control slide.
The vane pump according to claim 1, wherein the second chamber and the control chamber are not fluidly connected around the pivot pin. The vane pump of claim 1, wherein the fastener is a bolt that passes through the housing, the hollow portion of the pivot pin, and the cover to create a mounting portion between the components of the pump.

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