Lubricant supply device, method for manufacturing the same, and rolling sliding device

1. A lubricant supply device comprising:

a porous body including a first porous portion and a second porous portion in contact with the first porous portion, the porous body being impregnated with a lubricant, wherein a penetration depth of the lubricant in the second porous portion is larger than a penetration depth of the lubricant in the first porous portion.

2. The lubricant supply device according to claim 1 , wherein:

the first porous portion has a first mean pore diameter; and

the second porous portion has a second mean pore diameter that is larger than the first mean pore diameter.

3. The lubricant supply device according to claim 1 , wherein:

the first porous portion has a first surface tension; and

the second porous portion has a second surface tension that is larger than the first surface tension.

4. The lubricant supply device according to claim 1 , wherein:

the first porous portion has a first porosity; and

the second porous portion has a second porosity that is smaller than the first porosity.

5. The lubricant supply device according to claim 1 , wherein:

each of the first porous portion and the second porous portion is a portion of the porous body.

6. The lubricant supply device according to claim 1 , wherein:

the first porous portion is formed of a first porous body; and

the second porous portion is formed of a second porous body that is separate from the first porous body.

7. A method for manufacturing a lubricant supply device including a porous body including a first porous portion and a second porous portion in contact with the first porous portion, the porous body being impregnated with a lubricant, a penetration depth of the lubricant of the second porous portion being larger than a penetration depth of the lubricant of the first porous portion, the method comprising:

compressing one porous material to form the porous body including the second porous portion that is a compressed portion of the one porous material and the first porous portion that is a portion having a smaller degree of compression than that of the second porous portion.

8. A method for manufacturing a lubricant supply device including a porous body including a first porous portion and a second porous portion in contact with the first porous portion, the porous body being impregnated with a lubricant, a penetration depth of the lubricant of the second porous portion being larger than a penetration depth of the lubricant of the first porous portion, the method comprising:

bringing a first porous body constituting the first porous portion and a second porous body constituting the second porous portion into close contact with each other to form the porous body.

9. A rolling sliding device comprising:

a first rolling sliding member that has a first rolling sliding portion;

a second rolling sliding member that has a second rolling sliding portion;

a lubricant supply device; and

a contact portion in which the first rolling sliding portion and the second rolling sliding portion come into contact with each other in at least one mode of rolling contact and sliding contact, wherein:

a lubricant is supplied from the lubricant supply device to the contact portion;

the lubricant supply device has a first porous portion, a second porous portion continuous with the first porous portion, and a porous body which is impregnated with the lubricant;

a penetration depth of the lubricant in the second porous portion is larger than a penetration depth of the lubricant in the first porous portion; and

a distance between the second porous portion and the contact portion is smaller than a distance between the first porous portion and the contact portion.

10. The rolling sliding device according to claim 9 , wherein:

when the rolling sliding device is a rolling bearing including an inner ring that is the first rolling sliding member, an outer ring that is the second rolling sliding member, and a rolling element disposed between the inner ring and the outer ring, an inner ring raceway that is the first rolling sliding portion and an outer ring raceway that is the second rolling sliding portion are the contact portion that is in contact with the rolling element in at least one mode of the rolling contact and sliding contact, and

the porous body is disposed at an axial end portion of the inner ring or the outer ring.

11. The rolling sliding device according to claim 10 , wherein:

the porous body is disposed at each of both axial end portions of the inner ring or the outer ring.

12. The rolling sliding device according to claim 10 , wherein:

the porous body is fixed to a fixed ring comprising one of the inner ring and the outer ring.

13. The rolling sliding device according to claim 12 , further comprising:

an annular member that is fixed to an axial end portion of the fixed ring comprising one of the inner ring and the outer ring, wherein

the porous body is disposed between an axially inner side of the annular member and the fixed ring and is sandwiched by the annular member and the fixed ring.

14. The rolling sliding device according to claim 13 , wherein:

the annular member is disposed at each of both axial end portions of the fixed ring.