Hydraulic control valve for a longitudinally adjustable connecting rod with an end-face control piston

Patent metadata

Field	Value
Publication number	US-11486299-B2
Application number	US-201917283233-A
Country	US
Kind code	B2
Filing date	Oct 8, 2019
Priority date	Oct 8, 2018
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

A longitudinally adjustable connecting rod for a piston engine, where the connecting rod includes a first connecting rod end for receiving a piston pin and a second connecting rod end for receiving a crankshaft journal, where the distance between the piston pin and the crankshaft journal is adjustable in the longitudinal direction (A) of the connecting rod by way of a hydraulic control device with a hydraulic control valve. The hydraulic control valve comprises a control cylinder and a control slide which is guided in a slidable manner in the control cylinder and which can be pressurized, and at least one outlet valve which can be actuated by the control slide. The control slide comprises a control piston which is arranged on the end face, with a control pressure surface which can be subjected to the hydraulic control pressure and which defines a control pressure chamber in the control cylinder. The use of such a longitudinally adjustable connecting rod with a hydraulic control device in a piston engine as well as a corresponding piston engine is also provided.

First claim

The invention claimed is:

1. A longitudinally adjustable connecting rod for a piston engine, where said connecting rod comprises a first connecting rod end for receiving a piston pin and a second connecting rod end for receiving a crankshaft journal, where the distance between said piston pin and said crankshaft journal is adjustable in a longitudinal direction (A) of said connecting rod by way of a control device with a hydraulic control valve, and said hydraulic control valve comprises a control cylinder, a control slide which is guided in a slidable manner in said control cylinder and which can be pressurized with a hydraulic control pressure, and at least one outlet valve which can be actuated by said control slide, wherein said control slide comprises a control piston arranged on an end face, where said control piston comprises a control pressure surface which can be subjected to the hydraulic control pressure and which defines a control pressure chamber in said control cylinder.

2. The longitudinally adjustable connecting rod according to claim 1 , wherein said control pressure surface which can be subjected to the hydraulic control pressure is arranged on the end face of said control piston of said control slide.

3. The longitudinally adjustable connecting rod according to claim 1 , wherein said control slide comprises a slide tappet, where said slide tappet extends from said control piston arranged at the end face through said control cylinder for actuating said at least one outlet valve.

4. The longitudinally adjustable connecting rod according to claim 3 , wherein said slide tappet extends in the direction of a control slide axis through said control cylinder.

5. The longitudinally adjustable connecting rod according to claim 3 , wherein said slide tappet comprises a switching contour for actuating said at least one outlet valve.

6. The longitudinally adjustable connecting rod according to claim 1 , wherein at least two outlet valves which can be actuated by said control slide are provided.

7. The longitudinally adjustable connecting rod according to claim 6 , wherein said at least two outlet valves are arranged inclined relative to a control slide axis.

8. The longitudinally adjustable connecting rod according to claim 6 , wherein said at least two outlet valves are arranged on oppositely disposed sides of a control slide axis.

9. The longitudinally adjustable connecting rod according to claim 6 , wherein said at least two outlet valves can be actuated alternately by the control slide.

10. The longitudinally adjustable connecting rod according to claim 1 , wherein said hydraulic control device comprises a return spring for retaining said control slide in a first initial position or to return it to the first initial position.

11. The longitudinally adjustable connecting rod according to claim 1 , wherein said control slide is arranged inclined relative to the longitudinal direction (A) of said connecting rod and inclined to the normal to the longitudinal direction (A) of said connecting rod.

12. The longitudinally adjustable connecting rod according to claim 1 , wherein two connecting rod members are provided, where the first connecting rod member comprises said first connecting rod end and the second connecting rod member comprises said second connecting rod end and where said first connecting rod member is movable.

13. The longitudinally adjustable connecting rod according to claim 12 , wherein at least one cylinder-piston unit hydraulically connected to said hydraulic control device is provided for moving said first connecting rod member relative to said second connecting rod member, where said first connecting rod member is connected to an adjustable piston of said cylinder-piston unit and said second connecting rod member comprises a cylinder bore of said cylinder-piston unit.

14. A use of a longitudinally adjustable connecting rod with a hydraulic control valve in a piston engine, where said hydraulic control valve of said control device comprises a control cylinder, a pressurized control slide, and at least two outlet valves, and said control slide comprises a control piston arranged on the end face, where said control piston comprises a control pressure surface which defines a control pressure chamber in said control cylinder, where the use of the longitudinally adjustable connecting rod comprises guiding the control slide in a slidable manner in said control cylinder and pressurizing the control slide, and subjecting the control pressure surface to the hydraulic control pressure.

15. A piston engine with at least one engine cylinder, a reciprocating piston moving in said engine cylinder, and at least one adjustable compression ratio in said engine cylinder, and with a longitudinally adjustable connecting rod connected to said reciprocating piston according to claim 1 .

16. The longitudinally adjustable connecting rod according to claim 4 , wherein said slide tappet is formed to be rotationally symmetrical to said control slide axis.

17. The longitudinally adjustable connecting rod according to claim 7 , wherein said at least two outlet valves are arranged perpendicular to said control slide axis.

18. The longitudinally adjustable connecting rod according to claim 8 , wherein said at least two outlet valves are arranged perpendicular to said control slide axis.

19. The longitudinally adjustable connecting rod according to claim 10 , wherein said return spring is arranged around said control slide.

20. The longitudinally adjustable connecting rod according to claim 11 , wherein said control slide is arranged inclined relative to the longitudinal direction (A) of said connecting rod and inclined to the normal to the longitudinal direction (A) of said connecting rod at an angle between 15° and 75°.

21. The longitudinally adjustable connecting rod according to claim 12 , wherein said first connecting rod member is telescopically movable relative to said second connecting rod member in the longitudinal direction (A) of said connecting rod for adjusting the distance between said piston pin and said crankshaft journal.

Assignees

• Iwis Motorsysteme Gmbh & Co Kg
• Avl List Gmbh

Inventors

• Heller Malte
• Arens Kai
• Riba Zoltán
• Bodensteiner Martin
• Latz Steffen
• Kometter Bernhard
• Melde-Tuczai Helmut

Classifications

• F16K31/44

  Mechanical actuating means · CPC title

• F02B75/045 Primary

  by means of a variable connecting rod length · CPC title

• F16K31/52425

  with a ball-shaped valve member · CPC title

• F16C7/06

  Adjustable connecting-rods · CPC title

• F16K31/52416

  comprising a multiple-way lift valve · CPC title