JP2020509286A - Articulated joint for piston seals - Google Patents

Abstract

A fixed skirt (7) interconnected by a mechanical skirt connection (13) to axially compress the continuous extensible section (15) under the action of a sliding skirt spring (20). An articulated connection (1) is provided for a piston seal (2) for a piston (3) including a sliding skirt (12). Articulation means (40) may be provided between the mechanical connection between skirts (13) and the piston (3) and / or between said connection (13) and the sliding skirt (12); On the one hand, said connection (1), on the one hand, replaces the fixed skirt (7) by a ball joint skirt (22), on the other hand, the skirt provided on the ball joint skirt (22) A cutting spherical piston end (21) is provided which cooperates with the cutting spherical abutment surface (24). [Selection diagram] FIG.

Description

  The invention relates to an articulated coupling device for a piston closure device. The present invention is an improvement of the sealing device for the piston body of patent WO2015 / 011358A1, published on January 29, 2015 and belonging to the applicant. Note that the above device is particularly suitable for any piston operating under high pressure.

  A piston sealing device according to patent WO2015 / 011358A1 is provided for a piston operating in a cylinder whose one end is closed by a fluid chamber. The piston includes at least one piston head that includes at least one fixed skirt. The head has, on the one hand, a piston abutment surface for exerting a force on any mechanical, hydraulic or pneumatic transmission means, on the other hand, opening into the fluid chamber and Has a compressed surface capable of accepting pressures of

  Still according to patent WO2015 / 011358A1, the piston sealing device comprises a cylindrical sliding skirt housed in a cylinder with a small gap. The skirt is also arranged in the extension of the piston head on the side of the compression surface, at the axis of the head.

  While the pressure transmission flow path arranged in the sliding skirt section traverses the sliding skirt section from one end to the other end in the axial direction, the sliding skirt section is connected by a mechanical skirt section connection. Note that it is connected to the head, so that the sliding skirt can be translated longitudinally with respect to said head.

  The invention with respect to patent WO2015 / 011358A1 is also characterized by a continuous annular shaped extensible continuous section located between the fixed skirt and the sliding skirt. The area may be a cylindrical inner surface exposed to the pressure of the fluid through the pressure transmission channel, an outer cylindrical surface accessible to the cylinder, a direct or in sealing contact with the fixed skirt. A fixed skirt side area axial surface held indirectly and a sliding skirt side area axial surface held directly or indirectly in sealing contact with the sliding skirt.

  Finally, the invention with respect to patent WO2015 / 011358A1 relates to a method in which the sliding skirt is brought close to the fixed skirt and has a tendency to compress the continuous extensible section in the axial direction, or Is also characterized by a sliding skirt spring that acts at least as an abutment by preventing it from moving away from the fixed skirt.

  Reading patent WO2015 / 011358A1, it is understood that in order to operate, the piston sealing device requires that the piston head, its fixed skirt and the sliding skirt are always in alignment. This configuration is ideal for hydraulic pumps and motors whose pistons are oriented axially by the cylinder with which they cooperate.

  In contrast, the piston sealing device according to patent WO2015 / 011358A1 is not suitable for hydraulic pumps and motors whose pistons are not always parallel to the cylinder with which the piston cooperates. . This is the case, for example, with an oblique hydraulic motor having a spherical piston. Nevertheless, such an oblique-axis hydraulic motor is notably improved in volume and energy efficiency by the piston sealing device according to patent WO2015 / 011358A1.

The purpose of the articulated connection for the piston sealing device according to the invention is to provide a piston sealing device according to patent WO2015 / 011358A1 in which the piston (s) is not always associated with the cylinder with which the piston cooperates. The problem is to solve this problem by allowing it to be applied to any pump or hydraulic motor, which is not always parallel. According to that embodiment, the connecting portion is
The piston moves freely relative to the cylinder with which the piston cooperates;
The energy performance and durability of the piston sealing device according to patent WO2015 / 011358A1 is maintained despite the fact that the orientation of the piston changes periodically with respect to the cylinder;
It enables a slight increase in the manufacturing costs of the pistons of pumps or hydraulic motors receiving the piston sealing device according to patent WO2015 / 011358A1.

  In addition to being applied to hydraulic pumps or motors having an axial or radial piston, the articulated connection for the piston seal according to the present invention may be applied to any other pump, motor, motor It is understood that a pump, or a configuration thereof, may be applied to a hydraulic or pneumatic cylinder that advantageously allows the use of the connection.

  Other features of the invention are set forth in the description or in the dependent claims directly or indirectly dependent on the main claim.

An articulated connection is provided for the piston seal. The piston seal itself is provided for a piston operating in a cylinder to build a fluid chamber. A sliding skirt is accommodated in the cylinder with a small gap in the axis of the head, in the extension of the piston head on the side of the compression surface, while the piston has a piston head with a fixed skirt. And the head has, on the one hand, a piston abutment surface for exerting a force on the transmission means and, on the other hand, a compression surface which opens into the fluid chamber for receiving the pressure of the fluid, A transmission channel is disposed in the sliding skirt and traverses the sliding skirt from one end to the other end in the axial direction, while the sliding skirt is connected by a mechanical connection between the skirts. Connected to the head, whereby the sliding skirt is longitudinally translatable with respect to the head, the piston sealing device is provided with a fixed skirt and a sliding skirt. And a continuous extensible area positioned between the sliding skirt and the fixed skirt, and the sliding skirt spring tends to compress the continuous extensible area in the axial direction. Even when having the above, the above-mentioned area may be exposed to the pressure of the fluid through the pressure transmission flow path, the inner cylindrical surface, the outer cylindrical surface accessible to the cylinder, and the fixed skirt. Fixed skirt side area axial surface held directly or indirectly in sealed contact, and sliding skirt side area held directly or indirectly in sealed contact with the sliding skirt An axial surface, wherein the connection comprises:
A skirt portion having a ball joint functioning as a fixed skirt portion, which is traversed in the axial direction by a mechanical connection between the skirt portions and is placed between the extensible continuous section and the piston head, the sliding skirt; While the part spring holds the stack formed by the ball joint skirt and the continuous extensible area clamped between the sliding skirt and the piston head, the skirt, on the other hand, The axial surface of the swivel rotating skirt on the piston head side which is kept in sealing contact with the piston head, and, on the other hand, the slide which is held directly or indirectly in sealing contact with the continuous extensible area A skirt portion including a swivel rotating skirt portion on the moving skirt portion side,
A truncated spherical end of the piston disposed on the compression surface, the truncated spherical end being located near the longitudinal axis of the piston, the center of a sphere of which said end forms part;
A skirt cut spherical contact surface arranged on the axial surface of the swivel rotating skirt on the piston head side, the shape of which is complementary to the shape of the piston cut spherical end; The contact between the abutment surface and the end forms a ball joint connection and the ball joint skirt is rotatable about the ball joint connection to direct the ball joint skirt relative to the piston. There is a skirt cut spherical contact surface,
Including articulation means that are placed directly or indirectly between the mechanical connection between the skirts and the piston and / or between the connection and the sliding skirt.

  The articulated joint according to the invention includes articulated means consisting of a piston-side swivel rotary connection head that terminates the end of the mechanical connection between the skirts closest to the piston. It should be noted that the head allows the connection to pivot with respect to the piston, while the head substantially holds its position with respect to the piston.

  The articulated joint according to the present invention includes a center of rotation of the piston-side swivel rotary connection head with respect to the piston and a center of rotation of the ball joint skirt with respect to the piston, which share the same location with respect to the piston.

  The articulated joint according to the present invention includes a piston-side swivel rotary connection head that is articulated with a swivel rotary washer having a shape complementary to the shape of the head, and the washer is housed in the piston.

  The articulated joint according to the present invention is a joint comprising at least one sliding skirt-side sliding and swiveling rotary connection head that terminates the end of the mechanical connection between the skirts closest to the sliding skirt. Means, wherein the head portion substantially retains its radial position with respect to the skirt portion, but is substantially movable in the axial direction with respect to the skirt portion, while the head portion includes the connection portion. Allowing the part to pivot with respect to the skirt.

  An articulated connection according to the present invention includes a piston longitudinally traversed from one end to the other by a skirt-to-skirt connection tunnel, wherein the mechanical connection between the skirt and the piston The skirt-to-skirt mechanical connection is housed in the skirt-to-skirt connection tunnel with sufficient clearance to allow the part-to-part mechanical connection itself to be oriented.

  The articulated connection according to the present invention is directed to a piston side including a fluid passage transmission path that allows fluid to flow between the head and its housing or from one surface of the head to the other. Includes swivel rotary connection head.

  The articulated connection according to the present invention includes a sliding passage that includes a fluid passageway that allows fluid to flow between the head and its housing or from one surface of the head to the other. Includes a skirt side sliding and swivel rotary connection head.

  An articulated connection according to the present invention includes an outer cylindrical surface of a ball joint skirt having a circular depressurizing groove.

  The articulated connection according to the invention comprises a sliding skirt spring housed in a spring cup integral with the sliding skirt, the spring itself, on the one hand, directly or indirectly within the cup. Abuts, on the other hand, directly or indirectly against the mechanical connection between the skirts.

  The articulated joint according to the invention comprises a sliding skirt spring housed in an additional spring cup which directly or indirectly abuts the sliding skirt, said spring itself being, on the one hand, a direct Alternatively, it abuts indirectly in the cup, on the other hand, directly or indirectly against the mechanical connection between the skirts.

  The articulated connection according to the invention comprises a sliding skirt spring which abuts against the mechanical connection between the skirts in an additional spring cup and / or via a spring abutment washer.

  The articulated joint according to the invention includes a spring abutment washer having an axial stop abutment that determines the minimum length of the sliding skirt spring.

  The articulated joint according to the invention provides a dislocation contact that contacts the cylinder when the contact between the skirt cut spherical contact surface and the cut spherical piston end is completely or partially destroyed. It includes a piston having an abutment at its periphery, near the piston cutting spherical end.

  The following description, with reference to the accompanying drawings, given by way of non-limiting example, will provide a better understanding of the present invention, the features it provides, and the advantages it may provide.

FIG. 4 is a schematic sectional view of a variable displacement axial piston hydraulic motor, the piston of which receives an articulated connection for a piston sealing device according to the invention. While the sliding skirt receives an additional spring cup and the ball joint skirt has a circular depressurization groove and an axial depressurization groove, the connection is between the skirt mechanical connection and the piston, and FIG. 3 is a schematic sectional view of a piston for receiving an articulated connection according to the invention, for receiving an articulated means placed between the connection and the sliding skirt. FIG. 4 is a schematic sectional view showing the operation of the articulated joint according to the present invention, particularly when the piston rotates with respect to the ball joint skirt with which the piston cooperates. FIG. 4 is a schematic sectional view showing the operation of the articulated joint according to the present invention, particularly when the piston rotates with respect to the ball joint skirt with which the piston cooperates. FIG. 4 is a schematic sectional view showing the operation of the articulated joint according to the present invention, particularly when the piston rotates with respect to the ball joint skirt with which the piston cooperates. An articulated connection according to the invention, wherein the connection receives joint means placed between the mechanical connection between the skirts and the piston and between the connection and the sliding skirt. FIG. 4 is a three-dimensional view of an assembled piston receiving a part. The articulated mold according to the present invention, wherein the connection part itself receives the joint means placed between the mechanical connection between the skirts and the piston and between the connection and the sliding skirt. FIG. 4 is an exploded three-dimensional view of a piston that receives a connection portion. While the sliding skirt spring is housed in the additional spring cup, the connection itself is not between the connection and the sliding skirt, but rather between the mechanical connection between the skirt and the piston. According to the present invention, the joint center of the piston-side swivel rotary connection head portion, which receives the placed joint means, and the center of rotation of the ball joint skirt portion relative to the piston share the same location with respect to the piston. FIG. 4 is a schematic sectional view of a piston that receives an articulated connection portion. 9 is an assembled three-dimensional view of the piston shown in FIG. 8, wherein said piston receives a connection according to the invention. 9 is an assembled three-dimensional view of the piston shown in FIG. 8, wherein said piston receives an articulated connection according to the invention.

  1 to 10 show an articulated connection 1 for a piston sealing device 2 according to the invention, its components, variants and accessories.

  An articulated connection 1 for a piston seal 2 is provided. The piston seal 2 is itself provided for a piston 3 operating in a cylinder 4 to build a fluid chamber (5). Said piston 3 comprises a piston head 6 having a fixed skirt 7, said head comprising, on the one hand, a piston abutment surface 8 for exerting a force on a transmission means 9 and, on the other hand, the pressure of a fluid 11. A compression surface 10 that opens into the fluid chamber 5 for receiving.

  In addition, as clearly shown in FIGS. 1 to 5 and 8, a pressure transmission channel 14 is arranged in the sliding skirt 12 and extends axially from one end to the other. While traversing the sliding skirt 12, the piston sealing device 2 for which the articulated connection 1 according to the invention is provided for, the extension of the piston head 6 on the side of the compression surface 10, And a skirt portion 12 housed in the cylinder 4 in the presence of a small gap, wherein the sliding skirt portion 12 is connected to the head 6 by a mechanical connection 13 between the skirt portions, thereby The skirt portion 12 is capable of translating in the longitudinal direction with respect to the head 6.

  1 to 10, a piston sealing device 2 for which an articulated connection 1 according to the invention is provided comprises a continuous extensible section 15 placed between a fixed skirt 7 and a sliding skirt 12. Are also included.

  In FIGS. 7 to 10, the zone 15 is a zone-outside cylindrical surface 17 that is accessible to the cylinder 4 by a zone-inside cylindrical surface 16 that is exposed to the pressure of the fluid 11 via the pressure transmission channel 14. The fixed skirt side area axial surface 18 held directly or indirectly in sealing contact with the fixed skirt 7 and the sliding skirt 12 directly or in closed contact. It is noted that it includes a sliding skirt side area axial surface 19 which is held indirectly.

  In FIGS. 1 to 5 and FIGS. 7, 8 and 10, the piston sealing device 2 brings the sliding skirt 12 close to the fixed skirt 7 and moves the continuous extensible section 15 in the axial direction. It is also shown that it also includes a sliding skirt spring 20 that has a tendency to compress.

  Thus, in the specific situation of the piston sealing device 2 shown in FIGS. 1 to 10, the articulated connection 1 according to the invention is axially traversed by the skirt-to-skirt mechanical connection 13 and is continuous. It includes a ball joint skirt 22, which functions as the fixed skirt 7, located between the extensible section 15 and the piston head 6.

  As can be clearly seen in FIGS. 2 to 5 and 8, in the articulated connection 1 according to the invention, the sliding skirt spring 20 is formed by the ball joint skirt 22 and the continuous extensible section 15. The stacked body is kept clamped between the sliding skirt 12 and the piston head 6, while the ball joint skirt 22 is, on the one hand, kept in sealing contact with the piston head 6. The axial surface 23 of the piston head-side swivel skirt 25 and, on the other hand, the sliding skirt-side swivel skirt that is held directly or indirectly in sealing contact with the continuous extensible area 15. An axial surface.

  The articulated connection 1 according to the invention is a cut spherical piston end 21 arranged on the compression surface 10, said end 21 being a part of a spherical body whose center is the longitudinal axis of the piston 3. Also includes a cutting spherical piston end 21 disposed near the end.

  2 to 5, 8 and 10, the articulated joint 1 according to the invention is arranged on the axial surface 23 of the swivel rotating skirt part on the piston head side, and its shape is a cut spherical piston. It is shown to also include a skirt cut spherical abutment surface 24 that is complementary to the shape of the end 21.

  The contact between the abutment surface 24 and the end 21 forms a ball joint, and the ball joint skirt 22 surrounds the ball joint to direct the ball joint skirt 22 itself against the piston 3. It is noted that the contact portion is maintained in a sealed state regardless of the orientation of the piston 3 in the cylinder 4.

  In FIGS. 1 to 8 and 10 the articulated connection 1 according to the invention is provided, directly or indirectly, between the mechanical connection 13 between the skirts and the piston 3 and / or Between the part 13 and the sliding skirt part 12 comprises an articulation means 40, said connection part 13 being connected to the piston 3 or to the sliding skirt part 12 or to the piston 3 and the sliding skirt part 12. It is pivotable about said means 40 to form a pivoting and / or sliding joint having one, two or three free axes for both of the skirts 12. It will be noted that it is translatable with respect to said means 40.

  It should be emphasized that in certain applications of the articulated connection 1 according to the invention, the sliding skirt spring 20 is unnecessary and can be eliminated.

  According to an alternative embodiment of the articulated connection 1 according to the invention, shown in FIGS. 1 to 10, the articulation means 40 connects the end of the mechanical connection 13 between the skirts closest to the piston 3. A terminating piston-side swivel rotary connection head 27 may be provided, which substantially holds its position with respect to the piston 3, while the head 27 allows the connection 13 to pivot with respect to the piston 3. to enable.

  According to a particular embodiment of the articulated connection 1 according to the invention, which is shown in FIGS. 1 to 7, the piston-side swivel rotary connection head 27 is close to the end of the piston 3 including the piston abutment surface 8. It should be noted that the

  In this particular case, the sliding skirt spring 20 may be the subject of other variants housed inside and / or outside the end of the piston 3 including the piston abutment surface 8. In this case, at the other end of the piston 3, the mechanical connection 13 between the skirts is articulated directly or indirectly at the sliding skirt 12 by the connection head (sliding only by swivel rotation). On the other hand, the piston-side swivel rotary connection head 27 can slide and swivel.

  In a general sense, the piston-side swivel rotary connection head 27 and / or the sliding skirt-side slide and swivel can be screwed, crimped, joined, welded, fixed, or by any mounting method known to those skilled in the art. It will be noted that a rotating connection head 28 may be added at either end of the skirt-to-skirt mechanical connection 13.

  As shown in FIGS. 8 to 10, the center of rotation of the piston-side swivel rotary connection head portion 27 with respect to the piston 3 and the center of rotation of the ball joint skirt portion 22 with respect to the piston 3 are at the same position with respect to the piston 3. Can share. In this case, it is no longer necessary to place any articulation means 40 between the mechanical connection 13 between the skirts and the sliding skirt 12.

  Still referring to FIGS. 8 to 10, the piston-side swivel rotary connection head 27 is articulated on a swivel rotary washer 41 of a shape complementary to the shape of the head 27, said washer 41 being housed in the piston 3. It will be noted that it may be advantageous to be held in place in said piston 3 by an elastic ring 42, for example in the form of a circlip or a snap ring.

  In FIGS. 1 to 7 relating to these parts, the articulation means 40 is provided with at least one sliding skirt part sliding end which terminates the end of the mechanical connection 13 between the skirt parts closest to the sliding skirt part 12. A swivel rotary connection head 28, which substantially retains its radial position with respect to the skirt 12, but is substantially movable axially with respect to the skirt 12, while The head 28 is shown to enable the connection 13 to pivot with respect to the skirt 12.

  1 to 7, the piston 3 is traversed from one end to the other by a skirt connection tunnel 31 and the skirt mechanical connection 13 is connected to the piston 3 by a skirt mechanical connection. It is also shown that the inter-skirt mechanical connection 13 can be accommodated in the inter-skirt connection tunnel 31 with sufficient clearance to allow the part 13 itself to be oriented.

  The piston-side swivel rotary connection head 27 provides a fluid passage transmission that allows the fluid 11 to flow between the head 27 and its housing or from one surface of the head 27 to the other. It should be noted that road 29 is included. According to a particular embodiment of the articulated connection 1 according to the invention, which can be seen in particular in FIGS. Can be constructed.

  As also shown in FIGS. 2 to 5, the sliding skirt side sliding and swiveling rotary connection head section 28 is configured to allow the fluid 11 to flow between the head section 28 and its housing or the head section. It may include at least one fluid passage transmission line 29 that allows flow from one surface of the portion 28 to the other surface.

  According to an alternative embodiment of the articulated connection 1 according to the invention, the outer cylindrical surface of the ball joint skirt 22 has a circular depressurization groove 32 which limits the sealing of said skirt 22, whereby , The operation of the continuous extensible section 15 can be seen in FIGS. According to a supplementary embodiment of the articulated joint 1 according to the invention, the groove 32 connects at least one circular groove 32 to the axial surface 23 of the swivel rotating skirt part on the piston head side. It can cooperate with two axial vacuum grooves 33.

  3 to 7, the sliding skirt spring 20 is housed in a spring cup 39 integrated with the sliding skirt 12, the spring 20 itself, on the one hand, directly or indirectly inside the cup 39. It will be noted that it may abut directly or indirectly against the mechanical connection 13 between the skirts.

  According to a particular embodiment of the articulated connection 1 according to the invention, the fluid 11 can be passed from the inside of the cup 39 to the outside or from the outside to the inside so that the spring 11 It should be noted that the body may be penetrated by one or more orifices.

  As another variant, the sliding skirt spring 20 is housed in an additional spring cup 30 that directly or indirectly abuts the sliding skirt 12, the spring 20 itself, on the other hand, being either direct or It can abut indirectly in the cup (30), on the other hand, directly or indirectly against the mechanical connection 13 between the skirts. This variation is shown in FIG. 2 and FIGS.

  According to a particular embodiment of the articulated connection 1 according to the invention, the spring cup 30 is adapted to allow the fluid 11 to pass from inside to outside or from outside to inside of the additional spring cup 30. It should be noted that the body of the can be pierced by one or more orifices. This is particularly seen in FIG.

  In either case of the spring cup 39 or the additional spring cup 30 integrated with the sliding skirt 12, as clearly shown in FIGS. It will be noted that the abutment can be effected in either one of the cups and / or through the spring abutment washer 43 against the inter-skirt mechanical connection 13.

  In this case, it should be noted that the spring abutment washer 43 may include a means for centering the sliding skirt spring 47. As shown in FIGS. 8 and 10 above, the spring abutment washer 43 can abut the skirt-to-skirt mechanical connection 13 through an elastic ring 42 cooperating with an axial stop washer 45.

  It should be noted that in these same FIGS. 8 and 10, the spring abutment washer 43 may include an axial stop abutment 44 that determines the minimum length of the sliding skirt spring 20. The skirt portion 12 and / or the continuous extensible area 15 with which the skirt portion 12 cooperates may be moved such that the sliding skirt portion 12 moves away from the ball joint skirt portion 22 as a result of excessive stress. It is further understood that the stop abutment 44 is operable only when it is done.

  8 to 10, the piston 3 is moved relative to the cylinder 4 when the contact between the skirt cutting spherical contact surface 24 and the cutting spherical piston end 21 is completely or partially broken. It has been shown that a contacting dislocation abutment 46 may be included at the periphery of the piston 3, near the cut spherical piston end 21.

  Preferably, the dislocation abutment 46 is locally spherical or barrel-shaped, so that any contact that occurs between said abutment 46 and the cylinder 4 does not damage the inner surface of the cylinder 4. It will be noted that it has a soft shape.

Operation method of the present invention The operation method of the articulated joint 1 for the piston sealing device 2 according to the present invention can be easily understood from FIGS.

  FIG. 1 shows an articulated connection 1 and an oblique axis applied to a variable displacement axial piston hydraulic motor 34, which is known per se. The piston 3 of the motor 34 is housed in a cylinder 35 integrated with the transmission shaft 36 in rotation. These members are housed in the motor main body 38. It will be noted that such an engine 34 typically has a piston 3. The piston 3 exposes a cutting spherical end, which forms a sliding ball joint connection to the cylinder 4 and each piston 3 is articulated around said connection. As will be seen later, this articulation is implemented in a related but different form by the articulated connection 1 according to the invention.

  When the piston 3 of the motor 34 receives pressure and hydraulic fluid flow 11 due to the particular configuration of the valve plate 37 included in the motor 34, the piston 3 provides a drive torque to the transmission shaft 36. Thereby, the transmission shaft 36 can supply the driving force.

  By rotating together with the cylinder 35, each piston 3 of all the pistons 3 moves in and out of the cylinder 4 with which each piston 3 cooperates.

  If a single piston 3 is observed, the piston 3 does not remain parallel to the cylinder 4 with which the piston 3 cooperates, while the cylinder 35 rotates 360 degrees, It can be seen that it rotates about its two axes perpendicular to the longitudinal axis.

  According to the state of the art, this relative movement is solved by the use of spherical end pistons, but such pistons are not suitable for receiving the piston sealing device 2 which is the subject of patent WO2015 / 011358A1.

  This is why the articulated connection 1 for the piston closure device 2 according to the invention provides a ball joint skirt 22 located between the continuous extensible section 15 and the piston head 6.

  The function normally embodied by the piston spherical head of a diagonal hydraulic motor with a spherical piston is here, on the one hand, by a cutting spherical piston end 21 arranged on the compression surface 10 and, on the other hand, by the piston The skirt cut spherical abutment surface 24 located on the axial surface of the head-side swivel rotating skirt 23 is provided by a ball joint constructed when they are in sealing contact with each other.

  The articulated joint 1 according to the invention thus constructed is, on the one hand, that the piston sealing device 2 according to patent WO2015 / 011358A1 operates under the conditions provided by the above application, and on the other hand, the piston 3 allows operation under the situation of the oblique shaft motor according to the prior art, these two situations being the specific operation of the ball joint skirt 22 provided by the articulated connection 1 according to the invention. Is satisfied by

  As shown in FIG. 2, most of the stress due to the pressure of the fluid 11 spreading into the fluid chamber 5 is applied directly to the compression surface 10 contained by the piston head 6. Only a small part of the above stress is radially between the contact circle between the cutting spherical piston end 21 and the skirt cutting spherical abutment surface 24 on the one hand and the inner diameter of the cylinder 4 on the other hand. Is applied to the ball joint skirt 22 against its flange area. Further, the small portion of the stress is required to maintain a sufficient contact pressure between the cutting spherical piston end 21 and the skirt cutting spherical abutment surface 24, such that the contact pressure is reduced to two members. Note that this is a guarantee of a good seal between 21 and 24.

  3 to 5 show the inclination of the piston 3 with respect to the cylinder 4 made possible by the ball joint skirt 22 on the one hand and the mechanical connection 13 between the skirts on the other hand. The skirt-to-skirt mechanical connection 13 is accommodated in the skirt-to-skirt connection tunnel 31 with a sufficient clearance, and the skirt-to-skirt connection tunnel 31 extends from one end to the other in the longitudinal direction. The gap penetrating through the piston 3 is necessary for allowing the connection portion 13 to direct the connection portion 13 itself to the piston 3 without contacting the inner wall portion of the tunnel 31. It should be noted that

  3 to 5, a relatively large gap is also left between the orifice provided at the bottom of the spring cup 39 and the mechanical connection 13 between the skirts, whereby the piston is It is shown that the cup 39 and the connection 13 can never contact each other at the level of the orifice, no matter how the 3 is oriented.

  In any case, the situation is different in the particular configuration of the articulated connection 1 shown in FIG. 8, so that only a small gap is provided between the orifice provided at the bottom of the additional spring cup 30 and the cup 30 And the mechanical connection 13 between the skirts, which always takes the same orientation.

  3-5, the sliding skirt spring 20 takes the form of a helical compression spring, so that the sliding skirt spring 20 has a mechanical inter-skirt mechanical contact with a spring cup 39 on its bottom against which the spring 20 abuts. It will also be noted that it readily absorbs periodic variations in the orientation of the connection 13.

  The skirt-to-skirt mechanical connection 13 includes a piston-side swivel rotary connection head 27 at the piston abutment surface 8, so that the head 27 is independent of the orientation of the piston 3 with respect to the cylinder 4. While maintaining approximately the same radial and axial position with respect to the piston 3, it is also possible to enable the piston-side swivel rotary connection head 27 to pivot with respect to the piston 3, FIGS. It will be noted in FIG.

  Further, according to a particular embodiment of the articulated connection 1 according to the invention presented in FIGS. 1 to 7, the end of the inter-skirt mechanical connection 13 closest to the sliding skirt 12 is The sliding skirt part-side sliding / swiveling rotary connection head 28 includes a sliding skirt part-side sliding / swiveling rotary connecting head 28 whose head 28 has a diameter relative to the skirt 12. While maintaining the directional position, it can move substantially relative to the skirt 12 in the axial direction, while allowing the connection 13 to pivot with respect to the skirt 12.

  As particularly shown in FIGS. 3-5, the sliding skirt side sliding and swivel rotary connection head 28 is disposed at the sliding skirt 12 and the sliding skirt spring 20 is disposed therein. And a cutting spherical nozzle cooperating with a cylindrical housing contained by a spring cup 39.

  It should also be noted in FIG. 2 that the same is true if the spring cup 39 is replaced by an additional spring cup 30 abutting the sliding skirt 12.

  In both cases, the sliding skirt springs 20 respectively correspond, on the one hand, to the bottom of the spring cup 39 or the bottom of the additional spring cup 30 and, on the other hand, to the sliding skirt side sliding and swivel rotary connection head 28. It should be noted that pressing downwards.

  The piston-side swivel rotary connection head 27 includes a fluid passage transmission line 29, which allows the fluid 11 to pass between said head portion 27 and its housing, in particular It should be noted in FIG. This configuration makes it possible in particular to lubricate the piston contact surface 8 at the point of contact between the transmission means 9 and the piston contact surface 8.

  Still referring to FIG. 2, the sliding skirt side sliding and swivel rotary connection head section 28 includes a fluid path transmission path 29 which allows the fluid 11 to flow from one surface of the head section 28 to the other. It can be seen that it allows passage to the surface of the This arrangement reflects, on the one hand, the pressure which develops in the fluid chamber 5 against the area-inside cylindrical surface 16 and also against the compression surface 10 and, on the other hand, lubricates the piston abutment surface 8. To this end, it is possible to establish a fluid flow 11 in a fluid passageway 29 included by a piston-side swivel rotary connection head 27.

  The position of the pivot axis A of the piston 3 relative to the transmission means 9 and the position of the pivot axis B of the piston 3 relative to the ball joint skirt 22 are shown in FIGS.

  According to the specific embodiment of the articulated connection 1 according to the invention shown in FIGS. 3 to 5 above, the position of the pivot axis B is determined by the cutting spherical piston end 21 and the skirt cutting spherical contact surface. 24 with a large spherical contact radius. The large radius limits the corner effect experienced by the ball joint skirt 22, which tends to increase the radius. In addition, the large radius will reduce the axial size of the assembly consisting of the ball joint skirt 22, the continuous extensible area 15, and the sliding skirt 12.

  However, when the piston 3 pivots with respect to the cylinder 4 about two axes perpendicular to its longitudinal axis, the position of the pivot axis B is such that the position of the cutting spherical piston end 21 relative to the cylinder 4 is slight. It should be noted that there is great eccentricity.

  An alternative embodiment of the articulated connection 1 according to the invention is shown in FIGS. In this embodiment, the pivot axis B of the piston 3 with respect to the ball joint skirt 22 coincides with the rotation center of the ball joint skirt 22 with respect to the piston 3.

  According to the alternative embodiment described above, it is no longer necessary to provide an articulation means 40 that is placed directly or indirectly between the mechanical connection 13 between the skirts and the sliding skirt 12.

  However, according to the alternative embodiment, when the piston-side swivel rotary connection head 27 is articulated to the head 27 at a swivel rotary washer 41 that is complementary to the shape of the head 27. It is advantageous. The washer 41 is accommodated in the piston 3. In the piston 3, the washer 41 is held by an elastic ring 42.

  As can be easily inferred from FIGS. 1 to 10, no matter what variation is taken into account, the specific operation of the articulated joint 1 according to the invention will result in the invention subject of patent WO2015 / 011358A1. Certain piston seals 2 are indeed fully compatible with the variable displacement axial piston hydraulic motor 34 having the oblique axis shown in FIG.

  This application of the invention to the above-mentioned hydraulic motor has been accidentally disclosed in the present disclosure only by way of non-limiting example, and the possibility of an articulated connection 1 for a piston sealing device 2 according to the invention. The nature is not limited to the application described above. Indeed, the connection 1 may be applied to any machine or device that receives the piston sealing device 2 that is the subject of the invention of patent WO2015 / 011358A1, wherein said machine or device comprises at least one piston 3 This is possible as long as the piston 3 receives the device 2 and, in its operation, does not remain parallel to the cooperating cylinder.

  For example, the articulated connection part 1 according to the present invention is applied to an actuator cylinder piston and / or a return cylinder piston of a hydraulic inertial valve actuator, which is the subject matter of the patent application FR1655901 on Sep. 27, 2016 belonging to the present applicant. The above-mentioned piston can be applied as long as the piston sealing device 2 which is the subject matter of the patent WO2015 / 011358A1 is actually equipped.

  All of the foregoing description has been given by way of example only, and this in any way limits the scope of the invention, which may still include any other equivalents to the details set forth in this disclosure. It must also be understood that there is no restriction.

Claims (14)

An articulated connection (1) for a piston seal (2), said piston seal (2) operating in a cylinder (4) to establish a fluid chamber (5). Wherein the piston (3) comprises a piston head (6), and a sliding skirt (12) is provided on the axis of the head (6) on the side of the compression surface (10) on the side of the piston head (10). In an extension of 6), the piston head (6) comprises a fixed skirt (7), while being accommodated in the cylinder (4) with a small gap present, and the head comprises, on the one hand, transmission means A piston abutment surface (8) for exerting a force on (9) and, on the other hand, a compression surface (10) opening into said fluid chamber (5) for receiving the pressure of the fluid (11); , Having a pressure transmission A channel (14) is disposed within the sliding skirt (12) and traverses the sliding skirt (12) axially therethrough while the sliding skirt (12) is skirted. It is connected to the head (6) by an inter-unit mechanical connection (13), whereby the sliding skirt (12) is able to translate longitudinally with respect to the head (6). The piston sealing device (2) also includes a continuous extensible section (15) located between the fixed skirt (7) and the sliding skirt (12), the sliding skirt spring (20). Bring the sliding skirt (12) close to the fixed skirt (7) and tend to compress the continuous extensible area (15) in the axial direction, but the area (15) Sets the pressure transmission flow path (14) The inner cylindrical surface (16) exposed to the pressure of the fluid (11), the outer cylindrical surface (17) accessible to the cylinder (4) and the fixed skirt (7). A fixed skirt side area axial surface (18) which is held directly or indirectly in sealed contact with the sliding skirt (12); A sliding skirt side area axial surface (19) to be retained, said connection (1) comprising:
A fixed skirt (7) traversed axially by said inter-skirt mechanical connection (13) and located between said continuous extensible section (15) and said piston head (6) A ball joint skirt portion (22) functioning as: wherein the sliding skirt portion spring (20) comprises a stack formed by the ball joint skirt portion (22) and the continuous extensible section (15); While holding clamped between the sliding skirt (12) and the piston head (6), the skirt (22), on the one hand, seals against the piston head (6) The axial surface (23) of the swivel skirt part on the piston head side, which is kept in contact, and, on the other hand, is held directly or indirectly in sealing contact with said continuous extensible section (15). Includes a moving skirt side swivel skirt axial surface (25), a ball joint skirt portion (22),
A cutting spherical piston end (21) disposed on said compression surface (10), said end (21) being part of a sphere centered on the longitudinal axis of said piston (3); A cutting spherical piston end (21) located near the
A cutting spherical skirt contact surface (24) arranged on an axial surface (23) of the piston head side swivel rotating skirt, the shape of which corresponds to the shape of the cutting spherical piston end (21); And the contact between the abutment surface (24) and the end (21) forms a ball joint, the ball joint skirt (22) being complementary to the piston (3). A cutting spherical skirt abutment surface (24) rotatable about the ball joint to direct the ball joint skirt (22) with respect to;
Directly or between the mechanical connection between the skirts (13) and the piston (3) and / or between the connection (13) and the sliding skirt (12); An articulated connection (1), characterized in that it comprises an articulating means (40) which is placed indirectly.   The articulation means (40) comprises a piston-side swivel rotary connection head (27) that terminates the end of the inter-skirt mechanical connection (13) closest to the piston (3), The part (27) substantially holds the position of the head (27) with respect to the piston (3), while the head (27) is such that the connection (13) is pivoted with respect to the piston (3). The articulated joint according to claim 1, wherein the articulated joint allows movement.   The center of rotation of the piston-side swivel rotary connection head (27) relative to the piston (3) and the center of rotation of the ball joint skirt (22) relative to the piston (3) are relative to the piston (3). The joint of claim 2, wherein the joints share the same location.   The piston-side swivel rotary connection head (27) is articulated in a swivel rotary washer (41) of a shape complementary to the shape of the head (27), and the washer (41) is connected to the piston (3). The articulated joint according to claim 2, wherein the articulated joint is housed inside.   The articulation means (40) includes at least one sliding skirt side sliding and swivel rotation terminating an end of the inter-skirt mechanical connection (13) closest to the sliding skirt (12). A connecting head (28), said head (28) substantially retaining its radial position relative to said skirt (12), but substantially moving axially relative to said skirt (12). Joint according to claim 1, characterized in that, while possible, the head (28) allows the connection (13) to pivot with respect to the skirt (12). Mold connection.   The piston (3) is traversed longitudinally from one side to the other by a skirt-to-skirt connection tunnel (31), the skirt-to-skirt mechanical connection (13) being relative to the piston (3). In order to be able to orient the mechanical connection between the skirts (13), the mechanical connection between the skirts (13) is provided with sufficient clearance to allow the mechanical connection between the skirts (13). The articulated connection according to claim 1, characterized in that the articulated connection is accommodated in (1).   The piston-side swivel rotary connection head (27) allows the fluid (11) to flow between the head (27) and its housing or from one side to the other of the head (27). 3. Articulated connection according to claim 2, characterized in that it comprises a fluid passage transmission line (29) allowing the flow.   The sliding skirt part side sliding and swiveling rotary connection head part (28) is configured such that the fluid (11) is provided between the head part (28) and its housing or one of the head parts (28). 6. Articulated connection according to claim 5, characterized in that it comprises a fluid path transmission line (29) allowing flow from one surface to the other.   The articulated joint according to claim 1, wherein the outer cylindrical surface of the ball joint skirt (22) includes a circular depressurizing groove (32).   The sliding skirt spring (20) is housed in a spring cup (39) integrated with the sliding skirt (12), the spring (20) itself, on the other hand, directly or indirectly. 2. The articulated connection according to claim 1, characterized in that it abuts in the cup (39) and, on the other hand, directly or indirectly against the mechanical connection (13) between the skirts. .   The sliding skirt spring (20) is housed in an additional spring cup (30) which directly or indirectly abuts the sliding skirt (12), the spring (20) itself, on the one hand, 2. Abutment directly or indirectly in said cup (30), on the other hand, directly or indirectly against said mechanical connection between said skirts (13). 3. An articulated joint according to item 1.   The sliding skirt spring (20) abuts against the mechanical connection between skirts (13) in an additional spring cup (30) and / or through a spring abutment washer (43). The articulated joint according to claim 11, wherein:   The articulated mold according to claim 11, wherein the spring abutment washer (43) includes an axial stop abutment (44) that determines a minimum length of the sliding skirt spring (20). Connection.   Said piston (3) is adapted to allow said cylinder () to be completely or partially broken when the contact between said skirt cut spherical contact surface (24) and said cut spherical piston end (21) is completely or partially broken. 4) Includes a possible dislocation abutment (46) for contacting with (4), at the periphery of said piston (3), near said cutting spherical piston end (21). 2. The articulated joint according to 1.

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