Friction roller planetary gearing and speed-changing and differential gearing

Patent metadata

Field	Value
Publication number	US-9341245-B2
Application number	US-201414535243-A
Country	US
Kind code	B2
Filing date	Nov 6, 2014
Priority date	May 24, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A friction roller planetary gearing includes a first and a second sun which are axially displaceable with respect to one another and at least one of the suns is connected for conjoint rotation to a sun shaft. Stepped planets roll on the suns, on a first annulus and on a second annulus. The suns, the annuluses and the stepped planets are configured as friction rings. The second annulus is axially displaceable relative to the first annulus. A first torque-dependent axial displacement device controls a contact pressure between the suns and contact surfaces of the planets by using a torque-dependent axial displacement of at least one of the suns. A second torque-dependent axial displacement device controls a contact pressure between the annuluses and contact surfaces of the planets by using a torque-dependent axial displacement of at least one of the annuluses.

First claim

What is claimed is:

1. A friction roller planetary gearing, comprising:
a housing;
a sun shaft having a first and a second sun disposed thereon, said first and said second sun being configured as respective friction rollers and being axially displaceable with respect to one another, at least one of said first and said second sun being connected for conjoint rotation to said sun shaft;
a planet carrier;
a first annulus connected to said housing in a manner fixed against rotation relative thereto, said first annulus being configured as a friction ring;
a plurality of stepped planets rotatably supported on said planet carrier, said stepped planets being configured as friction rollers and each having a pair of contact surfaces of a relatively smaller diameter and a pair of contact surfaces of a relatively larger diameter, said planets each rolling on said suns by using an associated one of said pairs of contact surfaces and rolling on said first annulus by using at least one of said contact surfaces of a respective other one of said pairs of said contact surfaces;
a second annulus configured as a friction ring, said second annulus being disposed to be axially displaceable relative to said first annulus such that said planets roll on said first and on said second annulus by using a respective associated one of said pairs of contact surfaces of said planets;
a first torque-dependent axial displacement device controlling a contact pressure between said suns and associated ones of said contact surfaces of said planets by using a torque-dependent axial displacement of at least one of said suns; and
a second torque-dependent axial displacement device controlling a contact pressure between said annuluses and associated ones of said contact surfaces of said planets by using a torque-dependent axial displacement of at least one of said annuluses.

2. The friction roller planetary gearing according to claim 1 , wherein:
said planets are configured symmetrically, said contact surfaces of the relatively smaller diameter are associated with said annuluses and said contact surfaces of the relatively larger diameter are associated with said suns; and
said contact surfaces associated with said suns are disposed axially between said contact surfaces associated with said annuluses.

3. The friction roller planetary gearing according to claim 1 , wherein said first annulus is connected rigidly to said housing and said second annulus is connected to said housing in a manner fixed against rotation relative thereto.

4. The friction roller planetary gearing according to claim 1 , wherein:
said first torque-dependent axial displacement device, which is associated with said suns, has a ramp carrier and a set of spacers;
said ramp carrier is fixed for conjoint rotation to said sun shaft and is supported axially on said sun shaft on a side of said second sun facing away from said first sun; and
said set of spacers is provided between said ramp carrier and said second sun, said spacers are in contact with said ramp carrier and with said second sun, at least one of said ramp carrier and said second sun has ramp guides and said spacers are guided in said ramp guides.

5. The friction roller planetary gearing according to claim 4 , wherein:
said ramp carrier has a supporting ring and a ramp carrier sleeve; and
said supporting ring is connected in an axially fixed manner to said sun shaft, said ramp carrier sleeve is provided on a sun side of said supporting ring and is supported against said supporting ring, and said ramp carrier sleeve is connected for conjoint rotation to said sun shaft.

6. The friction roller planetary gearing according to claim 1 , wherein
said second torque-dependent axial displacement device, which is associated with said annuluses, has a ramp carrier and a set of spacers;
said ramp carrier is provided on a side of said second annulus facing away from said first annulus and is connected rigidly to said housing; and
said set of spacers is provided between said ramp carrier and said second annulus, said spacers are in contact with said ramp carrier and with said second annulus, at least one of said ramp carrier and said second annulus has ramp guides and said spacers are guided in said ramp guides.

7. The friction roller planetary gearing according to claim 4 , wherein said ramp guides are configured as undulating face cams.

8. The friction roller planetary gearing according to claim 6 , wherein said ramp guides are configured as undulating face cams.

9. The friction roller planetary gearing according to claim 4 , wherein said spacers of said first torque-dependent axial displacement device are configured as radially oriented cylindrical bodies.

10. The friction roller planetary gearing according to claim 6 , wherein said spacers of said second torque-dependent axial displacement device are configured as radially oriented cylindrical bodies.

11. The friction roper planetary gearing according to claim 4 , wherein said ramp guides are axially spring-loaded in a direction towards said spacers.

12. The friction roller planetary gearing according to claim 6 , wherein said ramp guides are axially spring-loaded in a direction towards said spacers.

13. The friction roller planetary gearing according to claim 1 , wherein said sun shaft is supported so as to be axially displaceable.

14. The friction roller planetary gearing according to claim 1 , including bearing journals connected in a radially fixed manner to said planet carrier, said planets being supported, at said planet carrier, on said bearing journals so as to be axially displaceable.

15. A speed-changing and differential gearing, comprising:
an input stage, a load stage, and a differential stage, which are each configured as planetary stages and are disposed coaxially with respect to one another;
said input stage being configured as a friction roller planetary gearing including:
a housing;
a sun shaft having a first and a second sun disposed thereon, said first and said second sun being configured as respective friction rollers and being axially displaceable with respect to one another, at least one of said first and said second sun being connected for conjoint rotation to said sun shaft;
a planet carrier;
a first annulus connected to said housing in a manner fixed against rotation relative thereto, said first annulus being configured as a friction ring;
a plurality of stepped planets rotatably supported on said planet carrier, said stepped planets being configured as friction ropers and each having a pair of contact surfaces of a relatively smaller diameter and a pair of contact surfaces of a relatively larger diameter, said planets each rolling on said suns by using an associated one of said pairs of contact surfaces and rolling on said first annulus by using at least one of said contact surfaces of a respective other one of said pairs of said contact surfaces;
a second annulus configured as a friction ring, said second annulus being disposed to be axially displaceable relative to said first annulus such that said planets roll on said first and on said second annulus by using a respective associated one of said pairs of contact surfaces of said planets;
a first torque-dependent axial displacement device controlling a contact pressure between said suns and associated ones of said contact surfaces of said planets by using a torque-dependent axial displacement of at least one of said suns; and
a second torque-dependent axial displacement device controlling a contact pressure between said annuluses and associated ones of said contact surfaces of said planets

Assignees

• Volkswagen Ag

Inventors

• Petersen Rainer
• Möckel Jörg
• Lutz Andreas
• Hanke Stefan

Classifications

• B60L2240/421

  Speed · CPC title

• B60L2240/423

  Torque · CPC title

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title

• F16H13/08 Primary

  with balls or with rollers acting in a similar manner · CPC title

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title