Hydraulic piston with a cooling and lubricating gasket valve

Patent metadata

Field	Value
Publication number	US-10753239-B2
Application number	US-201715615595-A
Country	US
Kind code	B2
Filing date	Jun 6, 2017
Priority date	Jun 6, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

The hydraulic piston (1) constitutes a hydraulic chamber (5) with a cylinder (4) and has a cylindrical body (6) connected—from the side of the chamber (5)—by a link-stop valve (3) to a cooling and lubricating gasket valve (2) which is passed right through by a flow calibration opening (27), the valve (2) being able to move in longitudinal translation over a short stroke with respect to the body (6) or to be held at a distance from the body (6) by the valve link-stop (3), a valve return spring (30) tending to move the valve (2) away from the cylindrical body (6).

First claim

The invention claimed is:

1. A hydraulic piston ( 1 ) comprising:
a cylindrical body ( 6 ) housed in a clearance in a cylinder ( 4 ),
said hydraulic piston ( 1 ) being translatable in said cylinder ( 4 ) with which said hydraulic piston ( 1 ) forms a hydraulic chamber ( 5 ) of a variable volume,
a first end of said hydraulic piston ( 1 ) having a compression surface ( 10 ) opening into the hydraulic chamber ( 5 ) for receiving pressure of a fluid ( 11 ),
a second end of said hydraulic piston ( 1 ) having a piston support surface ( 8 ) for exerting a force on a transmission means ( 9 ),
wherein said hydraulic piston ( 1 ) comprises:
at least one cooling and lubricating gasket valve ( 2 ) positioned on a side of the compression surface ( 10 ) and in an extension of the cylindrical body ( 6 ) with respect to which the at least one cooling and lubricating gasket valve ( 2 ) moves in longitudinal translation over a short stroke, said at least one cooling and lubricating gasket valve ( 2 ) comprising, first, a piston-side axial valve surface ( 23 ) which has a circular flow closure contact surface ( 24 ) which comes into contact with a valve contact surface ( 26 ) on the compression surface ( 10 ), said at least one cooling and lubricating gasket valve ( 2 ) having secondly an external cylindrical valve surface ( 14 ) which exposes a sealing means ( 16 ) which comes into contact with the cylinder ( 4 ) and remain sealed, said at least one cooling and lubricating gasket valve ( 2 ) comprising, third, a chamber-side axial valve surface ( 15 ) which faces the hydraulic chamber ( 5 );
at least one intermediate fluid outlet chamber ( 29 ) formed within the circular flow closure contact surface ( 24 ) by the piston-side axial valve surface ( 23 ) and the compression surface ( 10 );
at least one flow calibration opening ( 27 ) which passes through the at least one cooling and lubricating gasket valve ( 2 ) mainly through an axial direction, the hydraulic chamber ( 5 ) communicating with the at least one intermediate fluid outlet chamber ( 29 ) via said at least one flow calibration opening ( 27 );
at least one valve stop-link ( 3 ) which connects the at least one cooling and lubricating gasket valve ( 2 ) to the cylindrical body ( 6 ), said at least one valve stop-link ( 3 ) allowing said at least one cooling and lubricating gasket valve ( 2 ) to approach said cylindrical body ( 6 ) to a point that the circular flow closure contact surface ( 24 ) contacts the valve contact surface ( 26 ), while said at least one valve stop-link ( 3 ) prohibits said at least one cooling and lubricating gasket valve ( 2 ) from moving away from said cylindrical body ( 6 ) more than a certain distance; and
at least one valve return spring ( 30 ) which tends to move the at least one cooling and lubricating gasket valve ( 2 ) away from the cylindrical body ( 6 ).

2. The hydraulic piston according to claim 1 , wherein the at least one valve return spring ( 30 ) is wholly or partly housed within the at least one intermediate fluid outlet chamber ( 29 ).

3. The hydraulic piston according to claim 1 , wherein the sealing means ( 16 ) comprises at least one cutting segment ( 17 ) housed in a segment groove ( 18 ) provided in the at least one cooling and lubricating gasket valve ( 2 ) or added wholly or partly attached to said at least one cooling and lubricating gasket valve ( 2 ), said segment groove ( 18 ) opens at the external cylindrical value surface ( 14 ).

4. The hydraulic piston according to claim 1 , wherein the sealing means ( 16 ) comprises at least one flexible circular seal ( 19 ) housed in a segment groove ( 18 ) provided in the at least one cooling and lubricating gasket valve ( 2 ) or added wholly or partly attached to said at least one cooling and lubricating gasket valve ( 2 ), said segment groove ( 18 ) opens at the external cylindrical valve surface ( 14 ).

5. The hydraulic piston according to claim 1 , wherein the cylindrical body ( 6 ) has an anti-shearing release groove ( 20 ).

6. The hydraulic piston according to claim 1 , wherein a diameter of an axial end of the cylindrical body ( 6 ) situated on the side of the compression surface ( 10 ) gradually decreases over a certain length to form a lift relief ( 21 ).

7. The hydraulic piston according to claim 1 , wherein a diameter of an axial end of the cylinder ( 4 ) opposite the hydraulic chamber ( 5 ) gradually increases over a certain length to form a lift ( 12 ).

8. The hydraulic piston according to claim 1 , wherein the at least one valve link-stop ( 3 ) is constituted by a link-stop pin ( 13 ) which emerges integrally from the compression surface ( 10 ) in order to first pass through the at least one cooling and lubricating gasket valve ( 2 ) via a link-stop opening ( 22 ) provided in said at least one cooling and lubricating gasket valve ( 2 ) and, second, to project from the chamber-side axial valve surface ( 15 ) in order to expose to said chamber-side axial valve surface ( 15 ) a valve stop ( 28 ).

9. The hydraulic piston according to claim 8 , wherein the at least one flow calibration opening ( 27 ) comprises a clearance left between the external cylindrical valve surface ( 14 ) and the link-stop opening ( 22 ).

10. The hydraulic piston according to claim 1 , wherein the valve link-stop ( 3 ) is constituted by the valve link-stop extension ( 31 ) which emerges integrally with the piston-side axial valve surface ( 23 ), first, to penetrate into the cylindrical body ( 6 ) via a link-stop shaft ( 32 ) provided in said cylindrical body ( 6 ) and, second, to expose an extension stop ( 33 ) which works with a shaft stop ( 34 ) which is exposed by the link-stop shaft ( 32 ).

11. The hydraulic piston according to claim 10 , wherein the extension stop ( 33 ) comprises at least one flexible claw ( 42 ) that snaps into an abutment groove 43 forming the shaft stop 34 .

12. The hydraulic piston according to claim 10 , wherein the at least one valve return spring ( 30 ) is wholly or partly housed in an extender recess ( 44 ) arranged axially in the valve link-stop extension 31 .

Assignees

• Rabhi Vianney

Inventors

• Rabhi Vianney

Classifications

• F16J1/008

  with sealing lips · CPC title

• F05B2210/11

  liquid, i.e. incompressible · CPC title

• F04B53/18

  Lubricating · CPC title

• F04B53/143

  Sealing provided on the piston · CPC title

• F04B53/08

  Cooling; Heating; Preventing freezing · CPC title