Crankshaft and conrod assembly

Patent metadata

Field	Value
Publication number	US-11085369-B2
Application number	US-201816611895-A
Country	US
Kind code	B2
Filing date	May 8, 2018
Priority date	May 9, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A crankshaft and conrod assembly (100) comprising a crankshaft (110) and a conrod (150), wherein the crankshaft (110) comprises at least one main journal (111) and one crankpin journal (112), where the crankshaft (110) is provided with an oil supply structure for supplying the crankpin journal (112) with lubrication oil and the conrod (150) with an oil pressure, wherein the oil supply structure comprises: an oil supply conduit (113) provided between the main journal and the crankpin journal (112), at least a first and a second oil supply opening (114, 115) provided at the crankpin journal (112), and a connection point (116) where the oil supply conduit (113) connects to the first and second oil supply opening (114, 115).

First claim

The invention claimed is:

1. A crankshaft and conrod assembly comprising a crankshaft and a conrod, wherein:
the crankshaft comprises at least one main journal and one crankpin journal, and the at least one conrod is provided upon the crankpin journal, and the crankshaft is provided with an oil supply structure for supplying the crankpin journal with lubrication oil and the conrod with an oil pressure, wherein the oil supply structure comprises:
an oil supply conduit provided between the main journal and the crankpin journal, at least a first and a second oil supply opening provided at the crankpin journal, and
a connection point where the oil supply conduit connects to the first and second oil supply openings,
wherein the conrod is arranged upon the crank pin journal through a bearing sleeve, at which at least a first and a second oil groove is provided in a circumferential direction at an inner surface of the bearing sleeve,
wherein the first oil supply opening is provided at a first radial distance (D 1 ) from a rotational axis (rx 1 ) of the crankshaft and where the second oil supply opening is provided at a second radial distance (D 2 ) from the rotational axis (rx 1 ) and where both the first and the second radial distances (D 1 , D 2 ) are larger than or equal to the distance (d 1 ) between the connection point and the rotational axis (rx 1 ) of the crankshaft, and
wherein an opening angle (A) between the first and the second oil supply opening is larger or equal to an angle (B 1 , B 2 ) between opposing end portions of the two oil grooves and smaller or equal to the angular length (C 1 , C 2 ) of the respective oil groove.

2. The crankshaft and conrod assembly according to claim 1 , wherein the distance (d 1 ) between the connection point and the rotational axis (rx 1 ) of the crankshaft is shorter than the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal.

3. The crankshaft and conrod assembly according to claim 2 , wherein the distance (D 1 ) between the first oil supply opening and the rotational axis (rx 1 ) of the crankshaft is shorter than the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal.

4. The crankshaft and conrod assembly according to claim 2 , wherein the distance (D 2 ) between the second oil supply opening and the rotational axis (rx 1 ) of the crankshaft is shorter than the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal.

5. The crankshaft and conrod assembly according to claim 2 , wherein the distance (d 1 ) between the connection point and the rotational axis (rx 1 ) of the crankshaft is less than 90% of the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal.

6. The crankshaft and conrod assembly according to claim 5 , wherein the distance (d 1 ) between the connection point and the rotational axis (rx 1 ) of the crankshaft is less than 80% of the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal.

7. The crankshaft and conrod assembly according to claim 1 , wherein the angular length (C 1 ) of the first oil groove is essentially equal to the angular length (C 2 ) of the second oil groove.

8. The crankshaft and conrod assembly according to claim 1 , wherein an angle (A) between the first and the second oil supply opening is larger than an angle (B 1 , B 2 ) between opposing end portions of the two oil grooves and the angle (A) between the first and the second oil supply opening is larger than the angular distance (C) of at least one of the oil grooves and at least a third oil supply opening is provided in between the first and the second oil supply opening.

9. The crankshaft and conrod assembly according to claim 1 , wherein the first and second oil supply opening are connected with a channel extending as a chord between the first and second oil supply opening and that the connection point is provided at the proximity of the one of the first and second oil supply openings that is arranged the shortest distance (D 1 , D 2 ) from the rotational axis (rx 1 ) of the crankshaft.

10. The crankshaft and conrod assembly according to claim 1 , wherein the connection point is provided at a centre axis (rx 2 ) of the crankpin journal and the oil supply openings constitutes drill holes, which extends essentially perpendicular from an outer surface of the crankpin journal to the connection point.

11. The crankshaft and conrod assembly according to claim 1 , wherein the opening angle (A) is between 0 and 180 degrees.

12. The crankshaft and conrod assembly according to claim 1 , wherein the first and the second oil groove are provided with at least one feeding hole respectively, through which the conrod can be fed with oil pressure.

13. The crankshaft and conrod assembly according to claim 1 , wherein the crankshaft is provided with a plurality of crankpin journals and at least one crankpin journal is provided with a conrod.

14. A combustion engine with variable compression ratio provided with a crankshaft and conrod assembly according to claim 1 .

15. The combustion engine according to claim 14 , wherein when the combustion in the cylinder of the combustion engine exercises its highest force (Pmax) upon the conrod, the bearing sleeve and the oil supply openings are arranged such that a centre axis of the conrod is located above a surface of the crankpin journal where no oil supply opening is located.

16. A vehicle provided with a combustion engine with variable compression ratio according to claim 14 .

17. A crankshaft and conrod assembly comprising a crankshaft and a conrod, wherein:
the crankshaft comprises at least one main journal and one crankpin journal, and the at least one conrod is provided upon the crankpin journal, and the crankshaft is provided with an oil supply structure for supplying the crankpin journal with lubrication oil and the conrod with an oil pressure, wherein the oil supply structure comprises:
an oil supply conduit provided between the main journal and the crankpin journal, at least a first and a second oil supply opening provided at the crankpin journal, and
a connection point where the oil supply conduit connects to the first and second oil supply openings,
wherein the conrod is arranged upon the crank pin journal through a bearing sleeve, at which at least a first and a second oil groove is provided in a circumferential direction at an inner surface of the bearing sleeve,
wherein the first oil supply opening is provided at a first radial distance (D 1 ) from a rotational axis (rx 1 ) of the crankshaft and where the second oil supply opening is provided at a second radial distance (D 2 ) from the rotational axis (rx 1 ) and where both the first and the second radial distances (D 1 , D 2 ) are larger than or equal to the distance (d 1 ) between the connection point and the rotational axis (rx 1 ) of the crankshaft,
wherein the distance (d 1 ) between the connection point and the rotational axis (rx 1 ) of the crankshaft is shorter than the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal, and
wherein the distance (D 1 ) between the first oil supply opening and the rotational axis (rx 1 ) of the crankshaft is shorter than the distance between the rotational axis (rx 1 ) of the crankshaft and the centre axis (rx 2 ) of the crankpin journal.

Assignees

• Volvo Car Corp

Inventors

• Odenmarck Christer
• Petrov Peter
• Strömstedt Fredrik

Classifications

• F16C17/02

  for radial load only · CPC title

• F16C9/04

  Connecting-rod bearings; Attachments thereof · CPC title

• F16C2360/22

  Internal combustion engines · CPC title

• F16C7/06

  Adjustable connecting-rods · CPC title

• F01M2001/062

  Crankshaft with passageways · CPC title