Hydraulic piston with cooling and lubrication valve

Patent metadata

Field	Value
Publication number	US-10634246-B2
Application number	US-201816115771-A
Country	US
Kind code	B2
Filing date	Aug 29, 2018
Priority date	Sep 5, 2017
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

The hydraulic piston forms a hydraulic chamber with a cylinder and has a cylindrical body which receives a seal and whose external cylindrical surface is housed with little clearance in the cylinder in such a manner as to leave an interstitial space, the cylindrical body being run through by a cooling and lubrication pipe which can be opened or closed by a cooling and lubrication valve which is moved by translation by a valve-actuator in such a manner that fluid can pass via a flow calibration opening from the hydraulic chamber to the interstitial space when the pressure existing in the hydraulic chamber is low and cannot pass when the pressure in the chamber is high.

First claim

The invention claimed is:

1. A hydraulic piston ( 1 ) comprising a cylindrical body ( 6 ) which presents an external cylindrical surface ( 13 ) housed with little clearance in a cylinder ( 4 ) in such a manner as to leave an interstitial space ( 32 ) between said surface ( 13 ) and said cylinder ( 4 ), said piston ( 1 ) being capable of moving by translation in said cylinder ( 4 ) with which it forms a hydraulic chamber ( 5 ) of variable volume, a first end of said piston ( 1 ) having a compression face ( 10 ) leading into the hydraulic chamber ( 5 ) in order to receive the pressure of a fluid ( 11 ), while a second end of said piston ( 3 ) has a piston support face ( 8 ) in order to exert a force onto transmission means ( 9 ), said piston ( 1 ) comprising:
sealing means ( 16 ) arranged on the external cylindrical surface ( 13 ), said sealing means ( 16 ) being capable of forming a seal with the cylinder ( 4 );
at least one cooling and lubrication pipe ( 7 ) which is arranged entirely or partially in the cylindrical body ( 6 ), said pipe ( 7 ) starting with a pipe inlet ( 14 ) which communicates directly or indirectly with the hydraulic chamber ( 5 ), and ending with a pipe outlet ( 15 ) which opens directly or indirectly at the level of the external cylindrical surface ( 13 ), the fluid ( 11 ) being capable of circulating in said pipe ( 7 ) from said inlet ( 14 ) to said outlet ( 15 ) when the pressure existing in the hydraulic chamber ( 5 ) is greater than the pressure existing in the interstitial space ( 32 ), while the sealing means ( 16 ) prevent said fluid ( 11 ) from passing through an exterior of the cylindrical body ( 6 ) in order to run from said inlet ( 14 ) to said outlet ( 15 );
at least one cooling and lubrication valve ( 2 ) housed entirely or partially in the cooling and lubrication pipe ( 7 ) and which can open or close in order to respectively allow or prevent the circulation of the fluid ( 11 ) in said pipe ( 7 ), said valve ( 2 ) comprising a flow seal seat ( 24 ) which can either remain at a certain distance from a valve contact surface ( 26 ) arranged in an interior or at an end of the cooling and lubrication pipe ( 7 ) in order to allow the fluid ( 11 ) to pass or can be maintained in contact with said surface ( 26 ) in order to form with said surface ( 26 ) a sealing contact line ( 25 ) which prevents the passage of said fluid ( 11 );
at least one valve-actuator piston ( 22 ) which is rigidly connected to the cooling and lubrication valve ( 2 ) in such a manner as to be able to maneuver the latter for closing and/or opening, said valve-actuator piston ( 22 ) being housed with little clearance in an actuator cylinder ( 31 ) arranged in or on the cylindrical body ( 6 ), said valve-actuator piston ( 22 ) being capable of moving by longitudinal translation in said actuator cylinder ( 31 ) and having a high-pressure face ( 23 ) exposed to the pressure existing in the hydraulic chamber ( 5 ), while, opposite said high-pressure face ( 23 ), said valve-actuator piston ( 22 ) has a low-pressure side face ( 28 ) which communicates directly or indirectly with one or both of the interstitial space ( 32 ) and the piston support face ( 8 );
at least one flow calibration opening ( 27 ) which limits a maximum flow of fluid ( 11 ) which can circulate in the cooling and lubrication pipe ( 7 ), said opening ( 27 ) being placed—in a path of the fluid ( 11 )—in series with the cooling and lubrication valve ( 2 ) and in parallel with the valve-actuator piston ( 22 );
at least one valve return spring ( 30 ) which tends to move the flow seal seat ( 24 ) away from the valve contact surface ( 26 );
at least one valve stop spacer ( 3 ) which sets the maximum distance of separation of the flow seal seat ( 24 ) with respect to the valve contact surface ( 26 ).

2. The hydraulic piston according to claim 1 , wherein the valve return spring ( 30 ) is housed entirely or partially in an interior of an intermediate fluid chamber ( 29 ) formed between the valve-actuator piston ( 22 ) and the sealing contact line ( 25 ).

3. The hydraulic piston according to claim 1 , wherein the sealing means ( 16 ) comprise at least one cut segment ( 17 ) housed in at least one sealing groove ( 18 ) arranged in the cylindrical body ( 6 ) and opening on the external cylindrical surface ( 13 ).

4. The hydraulic piston according to claim 1 , wherein the sealing means ( 16 ) comprise at least one flexible circular gasket ( 19 ) housed in at least one sealing groove ( 18 ) arranged in the cylindrical body ( 6 ) and opening on the external cylindrical surface ( 13 ).

5. The hydraulic piston according to claim 1 , wherein an anti-shearing clearance groove ( 20 ) is arranged in the cylindrical body ( 6 ), said groove ( 20 ) opening on the external cylindrical surface ( 13 ).

6. The hydraulic piston according to claim 1 , wherein a diameter of an axial end of the cylindrical body ( 6 ) located on the side of the compression face ( 10 ) gradually decreases over a certain length in order to form a bearing taper ( 21 ).

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

8. The hydraulic piston according to claim 1 , wherein the flow calibration opening ( 27 ) is arranged in an interior of the valve-actuator piston ( 22 ) of which it connects one or both of the high-pressure face ( 23 ) and the low-pressure face ( 28 ) with the external cylindrical surface of said valve-actuator piston ( 22 ).

9. The hydraulic piston according to claim 1 , wherein the flow calibration opening ( 27 ) consists of the clearance left between the valve-actuator piston ( 22 ) and the actuator cylinder ( 31 ) with which said valve-actuator piston ( 22 ) cooperates.

10. The hydraulic piston according to claim 1 , wherein the cylindrical body ( 6 ) is run through entirely in the direction of the length thereof by a pipe for lubrication of the transmission means ( 33 ) which opens both on the compression face ( 10 ) and on the piston support face ( 8 ).

11. The hydraulic piston according to claim 1 , wherein the cooling and lubrication valve ( 2 ) and the valve-actuator piston ( 22 ) are made of a same block of material in order to form a valve-actuator piston assembly ( 34 ).

12. The hydraulic piston according to claim 11 , wherein the valve-actuator piston assembly ( 34 ) is run through entirely in the axial direction by the pipe for lubrication of the transmission means ( 33 ) around which it can slide while forming a seal with the latter.

13. The hydraulic piston according to claim 12 , wherein the valve-actuator piston assembly ( 34 ) ends with a sliding sealing end-piece ( 41 ) which forms a seal with an end-piece receiving cylinder ( 42 ) arranged in the pipe for lubrication of the transmission means ( 33 ), said sealing end-piece ( 41 ) enabling said assembly ( 34 ) to move by longitudinal translation with respect to said pipe ( 33 ).

14. The hydraulic piston according to claim 11 , wherein the valve-piston assembly ( 34 ) is run through entirely in the axial direction by the pipe for lubrication of the transmission means ( 33 ), said assembly ( 34 ) forming a portion of said pipe ( 33 ).

Assignees

• Rabhi Vianney

Inventors

• Rabhi Vianney

Classifications

• F03C1/0644

  Component parts · CPC title

• F04B53/18

  Lubricating · CPC title

• F03C1/0605 Primary

  Adaptations of pistons (pump pistons F04B1/124, F04B53/14) · CPC title

• F16J1/08 Primary

  Constructional features providing for lubrication · CPC title

• F16K15/026

  the valve member being a movable body around which the medium flows when the valve is open · CPC title