Provided is a friction transmission device including an input raceway ring, a planetary rolling element that is disposed around a rotation axis of the input raceway ring and comes into contact with the input raceway ring; an output raceway ring that comes into contact with the planetary rolling element and is connected to an output shaft, and a first support raceway ring and a second support raceway ring that come into contact with the planetary rolling element. A quadrangle is formed by extension lines of normal vectors at contact points between the planetary rolling element and the respective raceway rings.

Provided is a friction transmission device including an input raceway ring, a planetary rolling element that is disposed around a rotation axis of the input raceway ring and comes into contact with the input raceway ring; an output raceway ring that comes into contact with the planetary rolling element and is connected to an output shaft, and a first support raceway ring and a second support raceway ring that come into contact with the planetary rolling element. A quadrangle is formed by extension lines of normal vectors at contact points between the planetary rolling element and the respective raceway rings.

A multistage friction/traction speed adapter having a first drive which can include a plurality of free rollers orbiting around a sun element within a frame, transmitting their orbiting movement to guided rollers which do not contact the sun element or the frame. The guided rollers are driven in the orbiting movement and transmit the rotary movement to a carrier via corresponding pins which engage with the carrier. A second drive can include rollers having radial position variation which is prevented from being transmitted to the carrier by providing accommodation at the pin level, either by providing a bushing around the pins with a bore that is eccentric relative to its outer surface, either by engaging the pins into the carriers in portions thereof which are made more flexible. A friction/traction gear at an angle is also disclosed.

A multistage friction/traction speed adapter having a first drive which can include a plurality of free rollers orbiting around a sun element within a frame, transmitting their orbiting movement to guided rollers which do not contact the sun element or the frame. The guided rollers are driven in the orbiting movement and transmit the rotary movement to a carrier via corresponding pins which engage with the carrier. A second drive can include rollers having radial position variation which is prevented from being transmitted to the carrier by providing accommodation at the pin level, either by providing a bushing around the pins with a bore that is eccentric relative to its outer surface, either by engaging the pins into the carriers in portions thereof which are made more flexible. A friction/traction gear at an angle is also disclosed.

The present invention relates to a reducer (10) comprising: a hollow input shaft (100) having a driving surface (110) therein; an output shaft (200) which is accommodated inside the input shaft (100) and having an output shaft body (210) having an output shaft gear (220) formed along the circumferential direction on the outer surface; a plurality of rollers (R) aligned between the output shaft (200) and the driving surface (110) and extending in the axial direction; and ring-shaped caps (300) positioned on both sides of the axial direction of the rollers (R), wherein the rollers (R) are guided to move in the radial direction by means of the caps (300) and, when the input shaft (100) rotates, the rollers (R) are pressurized against the driving surface (110) to pressurize the output shaft gear (200), so that the output shaft (200) rotates.

The present invention relates to a reducer (10) comprising: a hollow input shaft (100) having a driving surface (110) therein; an output shaft (200) which is accommodated inside the input shaft (100) and having an output shaft body (210) having an output shaft gear (220) formed along the circumferential direction on the outer surface; a plurality of rollers (R) aligned between the output shaft (200) and the driving surface (110) and extending in the axial direction; and ring-shaped caps (300) positioned on both sides of the axial direction of the rollers (R), wherein the rollers (R) are guided to move in the radial direction by means of the caps (300) and, when the input shaft (100) rotates, the rollers (R) are pressurized against the driving surface (110) to pressurize the output shaft gear (200), so that the output shaft (200) rotates.

The present invention relates to a reducer (10) comprising: a hollow input shaft (100) having a driving surface (110) therein; an output shaft (200) which is accommodated inside the input shaft (100) and having an output shaft body (210) having an output shaft gear (220) formed along the circumferential direction on the outer surface; a plurality of rollers (R) aligned between the output shaft (200) and the driving surface (110) and extending in the axial direction; and ring-shaped caps (300) positioned on both sides of the axial direction of the rollers (R), wherein the rollers (R) are guided to move in the radial direction by means of the caps (300) and, when the input shaft (100) rotates, the rollers (R) are pressurized against the driving surface (110) to pressurize the output shaft gear (200), so that the output shaft (200) rotates.

The present invention relates to a reducer (10) comprising: a hollow input shaft (100) having a driving surface (110) therein; an output shaft (200) which is accommodated inside the input shaft (100) and having an output shaft body (210) having an output shaft gear (220) formed along the circumferential direction on the outer surface; a plurality of rollers (R) aligned between the output shaft (200) and the driving surface (110) and extending in the axial direction; and ring-shaped caps (300) positioned on both sides of the axial direction of the rollers (R), wherein the rollers (R) are guided to move in the radial direction by means of the caps (300) and, when the input shaft (100) rotates, the rollers (R) are pressurized against the driving surface (110) to pressurize the output shaft gear (200), so that the output shaft (200) rotates.

Disclosed is an air pump for a fuel cell that utilizes a speed-reduction traction drive so that a low speed electric motor can be used to drive a high-speed rotodynamic compressor. The rotodynamic compressor is an efficient air pump, but operates at high speeds that would require a specialized high-speed electric motor. The speed-reduction traction drive couples to the compressor and provides a low-speed output that is connected to a lower speed electric motor.

Disclosed is an air pump for a fuel cell that utilizes a speed-reduction traction drive so that a low speed electric motor can be used to drive a high-speed rotodynamic compressor. The rotodynamic compressor is an efficient air pump, but operates at high speeds that would require a specialized high-speed electric motor. The speed-reduction traction drive couples to the compressor and provides a low-speed output that is connected to a lower speed electric motor.