Unbalanced shaft

Patent metadata

Field	Value
Publication number	US-2016017956-A1
Application number	US-201514803525-A
Country	US
Kind code	A1
Filing date	Jul 20, 2015
Priority date	Jul 18, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

An unbalanced shaft for compensating inertial forces and/or moments of inertia for a reciprocating internal combustion engine includes at least one shaft section and a bearing journal adjacent to the at least one shaft section and an unbalance mass disposed on the shaft section. The bearing journal is formed from at least two parts including a first solid bearing segment and a second solid bearing segment, and a center of gravity of the shaft section and the bearing journal is eccentric to an axis of rotation of the unbalanced shaft. The first solid bearing segment includes a portion projecting into the second solid bearing segment and the second solid bearing segment include a portion projecting into the first solid bearing segment such that the first and the second solid bearing segment are secured at least axially relative to each other.

First claim

1 . An unbalanced shaft for compensating inertial forces and moments of inertia for a reciprocating internal combustion engine, comprising:
at least one shaft section and a bearing journal adjacent to the at least one shaft section, and an unbalance mass disposed on the shaft section, wherein the bearing journal comprises at least two parts including a first solid bearing segment and a second solid bearing segment, wherein a center of gravity of the shaft section and the bearing journal is eccentric to an axis of rotation of the unbalanced shaft, and wherein the first solid bearing segment includes a portion projecting into the second solid bearing segment and the second solid bearing segment include a portion projecting into the first solid bearing segment such that the first and the second solid bearing segment are secured at least axially relative to each other.

2 . The unbalanced shaft according to claim 1 , wherein the first and the second bearing segments are configured such that they are at least partially secured radially relative to each other.

3 . The unbalanced shaft according to claim 1 , wherein the portion of the first solid bearing segment and the portion of the second solid bearing segment are disposed radially inside an outer periphery of the bearing journal.

4 . The unbalanced shaft according to claim 1 , wherein the portion of the first solid bearing segment and the portion of the second solid bearing segment form a plug connection between the first and the second bearing segments.

5 . The unbalanced shaft according to claim 1 , wherein the portion of the first solid bearing segment comprises a plug receivable in a complementary recess of the second solid bearing segment.

6 . The unbalanced shaft according to claim 1 , wherein at least the first bearing segment is manufactured from an injectable material, a moldable material, or an injection-moldable material.

7 . The unbalanced shaft according to claim 1 , wherein at least the first bearing segment is manufactured from a plastic.

8 . The unbalanced shaft according to claim 6 , wherein the first bearing segment is overmolded onto the second bearing segment.

9 . The unbalanced shaft according to claim 1 , wherein a material of the first solid bearing segment has a lower density than a material of the second solid bearing segment.

10 . The unbalanced shaft according to claim 1 , wherein at least the first bearing journal includes a cylindrical outer surface configured to form an inner running surface for rolling elements of a rolling-element bearing with line contact, and wherein at least a portion of a transition formed in the running surface between the first solid bearing segment and the second solid bearing segment is angled relative to a line along which the rolling elements make contact with the inner running surface.

11 . The unbalanced shaft according to claim 1 ,
wherein the portion of the first solid bearing segment and the portion of the second solid bearing segment form a plug connection between the first and the second bearing segment, wherein the portion of the first solid bearing segment comprises a plug receivable in a complementary recess of the second solid bearing segment, wherein at least the first bearing segment is manufactured from a plastic, wherein the first bearing segment is overmolded onto the second bearing segment, wherein a material of the first solid bearing segment has a lower density than a material of the second solid bearing segment, and wherein at least the first bearing journal includes a cylindrical outer surface configured to form an inner running surface for rolling elements of a rolling-element bearing with line contact, and wherein at least a portion of a transition formed in the running surface between the first solid bearing segment and the second solid bearing segment is angled relative to the line along which the rolling elements make contact with the inner running surface.

12 . An unbalanced shaft for compensating inertial forces and moments of inertia for a reciprocating internal combustion engine, comprising:
at least one shaft section and a bearing journal adjacent to the at least one shaft section configured to support the at least one shaft section for rotation about an axis of rotation, and at least one mass disposed on the shaft section such that a center of mass of the unbalanced shaft is radially offset from the axis of rotation, wherein the bearing journal comprises a first solid bearing segment formed from a first material and a second solid bearing segment formed from a second material different than the first material, and wherein the first solid bearing segment includes a first projection and the second solid bearing segment include a first recess complementary to the first projection, the first projection extending into the first recess and securing the first solid bearing segment against axial movement relative to the second solid bearing segment.

13 . The unbalanced shaft according to claim 12 , wherein at least the first bearing journal includes a cylindrical outer surface configured to form an inner running surface for rolling elements of a rolling-element bearing with line contact, and wherein at least a portion of a transition formed in the running surface between the first solid bearing segment and the second solid bearing segment is angled relative to a line along which the rolling elements make contact with the inner running surface.

14 . The unbalanced shaft according to claim 13 , wherein the transition includes a center portion parallel to the line along which the rolling elements make contact with the inner running surface and an end portion extending from an end of the center portion at an obtuse angle.

15 . The unbalanced shaft according to claim 12 , wherein the second solid bearing segment includes a second projection and the first solid bearing segment include a second recess complementary to the second projection, the second projection extending into the second recess.

Assignees

• Bauch Riad
• Ludwig Daniel
• Skf Ab

Inventors

• Bauch Riad
• Ludwig Daniel

Classifications

• F16F15/267 Primary

  characterised by bearing support of balancer shafts; Lubrication arrangements · CPC title