Hybrid rolling bearing, particularly for refrigerant compressor

Patent metadata

Field	Value
Publication number	US-10753396-B2
Application number	US-201816121941-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Dec 20, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A Hybrid rolling bearing includes an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The outer raceway and the inner raceway are made from bearing steel, having a first surface RMS roughness Rq1. The rolling elements are made from a ceramic material and have second surface RMS roughnesses Rq2,i. At least one of the rolling elements has an increased surface RMS roughness Rq2,N, which is significantly higher than the RMS roughnesses Rq2,i, of the remaining rolling elements. The hybrid rolling bearing can be installed within a refrigerant compressor.

First claim

What is claimed is:

1. A hybrid rolling bearing comprising:
an inner raceway;
an outer raceway; and
a plurality of rolling elements arranged therebetween,
wherein the outer raceway and the inner raceway are made from bearing steel and have a first surface RMS roughness R q1 , and the rolling elements are made from a ceramic material,
wherein the plurality of rolling elements include at least one of the rolling elements having an increased surface RMS roughness R q2,N which is at least ten (10) times higher than a RMS roughnesses R q2,i of any remaining rolling elements, wherein the remaining rolling elements include at least one of the rolling elements.

2. The hybrid rolling bearing according to claim 1 , wherein the increased RMS roughness R q2,N of the at least one rolling element is twenty-five (25) times higher than the RMS roughnesses R q2,i of the remaining rolling elements.

3. The hybrid rolling bearing according to claim 1 , wherein the increased roughness R q2,N of the at least one rolling element is higher than the roughness R q1 of the raceways.

4. The hybrid rolling bearing according to claim 1 , wherein the hybrid rolling bearing is a hybrid ball bearing (20) and the rolling elements are balls.

5. The hybrid rolling bearing according to claim 4 , wherein the increased RMS roughness R q2,N of the at least one ball is 2 to 12 times higher than the RMS roughness of the raceways R q1 .

6. The hybrid rolling bearing according to claim 4 , wherein at least one of:
the combined surface RMS roughness R q of raceways and the remaining balls is R q ≤4×10 −9 (1000d m ) 0.55 [meter], and the combined surface RMS roughness R q of raceways and the at least one ball with the increased roughness is R q ≤f*4×10 −9 (1000d m ) 0.55 [meter], with 2≤f≤12, wherein R q is defined as R q =√{square root over (R q1 2 +R q2 2 )}, wherein d m is a mean diameter of the hybrid rolling bearing and R q2 is the roughness of remaining balls,
the combined roughness skewness R sk of raceways and all balls is R sk ≤0, wherein R sk is defined as

R
sk

=

R

sk
⁢

⁢
1

⁢

R

q
⁢

⁢
1

3

+

R

sk
⁢

⁢
2

⁢

R

q
⁢

⁢
2

3

R
q
3

;

 wherein R sk1 is a combined roughness skewness of raceways and R sk2 is a combined roughness skewness of balls, and
the combined roughness slope parameter R Δgx of raceways and remaining balls is R Δqx ≤8 [mrad], and the combined roughness slope parameter R Δqx of raceways and the at least one ball with increased roughness is R Δqx ≤f*8 [mrad], with 2≤f≤12, wherein R Δgx is defined as

R

Δ
⁢

⁢
qx

=

R

Δ
⁢

⁢
qx
⁢

⁢
1

+

R

Δ
⁢

⁢
qx
⁢

⁢
2

2

,

 wherein R Δqx1 is a combined roughness slope parameter of raceways and R Δqx2 is a combined roughness slope parameter of remaining balls.

7. The hybrid rolling bearing according to claim 1 , wherein the rolling elements are rollers.

8. The hybrid rolling bearing according to claim 7 , wherein the increased RMS roughness R q2,N of the at least one roller is two (2) to twelve (12) times higher than the RMS roughness of the raceways R q1 .

9. The hybrid rolling bearing according to claim 7 , wherein at least one of:
the combined surface RMS roughness R q of raceways and the remaining rollers is R q ≤5×10 −8 (1000d m ) 0.2 [meter], and the combined surface RMS roughness R q of raceways (13; 15) and the at least one roller with the increased roughness is R q ≤f*5×10 −8 (1000d m ) 0.2 [meter], with 1.2≤f≤18, wherein R q is defined as R q =√{square root over (R q1 2 +R q2 2 )}, wherein d m is a mean diameter of the hybrid rolling bearing,
the combined roughness skewness R sk of raceways (13; 15) and all rollers is R sk ≤0, wherein R sk is defined as

R
sk

=

R

sk
⁢

⁢
1

⁢

R

q
⁢

Assignees

• Skf Ab

Inventors

• Hauleitner Rudolf
• Morales Espejel Guillermo Enrique
• Gabelli Antonio
• Kerrigan Aidan
• Vieillard Charlotte

Classifications

• F16C33/56

  Selection of substances (F16C33/48, F16C33/49 take precedence) · CPC title

• F16C33/32

  Balls · CPC title

• F16C33/6692

  Liquids other than oil, e.g. water, refrigerants, liquid metal · CPC title

• F16C19/543

  in O-arrangement · CPC title

• F16C2208/04

  Glass fibres · CPC title