CN-121977053-A - Internal friction wheel speed reducer

Abstract

The invention relates to the technical field of speed reducers, in particular to an inner friction wheel speed reducer which comprises a base, a crankshaft, an inner friction wheel, an outer friction wheel and an output disc, wherein an eccentric shaft section of the crankshaft is connected with the inner friction wheel, the outer friction wheel comprises a first outer friction wheel and a second outer friction wheel which are mutually matched and are arranged in a split mode, the first outer friction wheel and the second outer friction wheel are both arranged on the base, inclined friction surfaces are respectively arranged on the first outer friction wheel and the second outer friction wheel, a V-shaped cavity formed by the inclined friction surfaces is arranged between the first outer friction wheel and the second outer friction wheel, the inner friction wheel is arranged in the V-shaped cavity, the outer side wall of the inner friction wheel is bonded with the V-shaped cavity to form a V-shaped friction pair, and the output disc is connected with the inner friction wheel. The invention has compact structure and strong transmission capability, obviously increases the positive pressure between the friction pairs, has compact structure and is suitable for precise transmission occasions with limited installation space.

Inventors

• HE CHAO
• XIONG TAO
• Feng Yingyuan
• LIANG JIANBANG
• CHEN QIANYAN
• CHEN YANGZHI
• CHEN ZHEN
• XIAO XIAOPING
• YU WENCHAO
• ZHANG BANGJIAN
• AI JUNJIE
• YANG XIN

Assignees

• 广东海洋大学

Dates

Publication Date

20260505

Application Date

20260317

Claims (10)

1. 1. The utility model provides an interior friction pulley reduction gear, its characterized in that, includes base (100), bent axle (200), interior friction pulley (300), outer friction pulley and output dish (600), the eccentric shaft section of bent axle (200) with interior friction pulley (300) are connected, outer friction pulley is including mutually supporting and be first outer friction pulley (400) and second outer friction pulley (500) that split type set up, first outer friction pulley (400) and second outer friction pulley (500) all install on base (100), first outer friction pulley (400) with all be provided with slope friction surface (410) on second outer friction pulley (500), be provided with between first outer friction pulley (400) with second outer friction pulley (500) by V die cavity that slope friction surface (410) constitutes, interior friction pulley (300) set up in the V die cavity, the lateral wall of interior friction pulley (300) with V die cavity paste and form V type friction pair, output dish (600) with interior friction surface (500) are connected.
2. 2. The internal friction wheel reducer according to claim 1, wherein the inclined friction surfaces (410) of the first external friction wheel (400) and the inclined friction surfaces (410) of the second external friction wheel (500) are symmetrically arranged, two inclined matching surfaces matched with the V-shaped cavity are arranged on the outer side wall of the internal friction wheel (300), the two inclined matching surfaces are in one-to-one correspondence fit with the inclined friction surfaces (410) of the first external friction wheel (400) and the second external friction wheel (500), and the V-shaped friction pair is a surface contact friction pair.
3. 3. The inner friction wheel reducer according to claim 1, further comprising a torque adjustment module connected to the first outer friction wheel (400) and/or the second outer friction wheel (500), the torque adjustment module being configured to adjust an axial compression force of the first outer friction wheel (400) and the second outer friction wheel (500) against the inner friction wheel (300).
4. 4. An inner friction wheel decelerator according to claim 3, characterized in that the torque adjustment module comprises a torque adjustment ring (710), an adjustment screw (720) and a locking screw (730), the torque adjustment ring (710) is rotatably mounted on the base (100), the torque adjustment ring (710) is circumferentially provided with a wedge slot (711), one end of the adjustment screw (720) is abutted against the inner wall of the wedge slot (711), the other end passes through the second outer friction wheel (500) to be in threaded connection with the first outer friction wheel (400), and the locking screw (730) passes through the torque adjustment ring (710) to be in threaded connection with the base (100) for locking the torque adjustment ring (710) adjusted in place to the base (100).
5. 5. The internal friction wheel reducer according to claim 4, wherein an adjusting handle (712) is provided on an outer peripheral surface of the torque adjusting ring (710), and graduation marks are provided on both the base (100) and the torque adjusting ring (710).
6. 6. The internal friction wheel reducer according to claim 1, wherein a pin shaft (610) is disposed on an end surface of the output disc (600), a through hole (320) matched with the pin shaft (610) is disposed on the internal friction wheel (300), a shaft sleeve (620) is disposed between the pin shaft (610) and the through hole (320), the shaft sleeve (620) is sleeved on the outer side of the pin shaft (610), and an outer wall of the shaft sleeve (620) is in contact with the through hole (320).
7. 7. The internal friction-wheel reducer according to claim 6, characterized in that the diameter of the through hole (320) An outer diameter of the sleeve (620) The eccentricity a of the crankshaft (200) satisfies the relationship: 。
8. 8. The internal friction wheel reducer according to any one of claims 1 to 7, characterized in that a first bearing (110) is provided between the crankshaft (200) and the base (100), an inner ring of the first bearing (110) is connected to the crankshaft (200), and an outer ring of the first bearing (110) is fitted to the base (100).
9. 9. The internal friction wheel speed reducer according to any one of claims 1 to 7, wherein a second bearing (210) is sleeved on the eccentric shaft section of the crankshaft (200), a third bearing (220) is sleeved on the non-eccentric shaft section of the crankshaft (200), an inner ring of the second bearing (210) is connected with the eccentric shaft section of the crankshaft (200), an outer ring of the second bearing (210) is matched with an inner side wall of the internal friction wheel (300), an inner ring of the third bearing (220) is connected with the non-eccentric shaft section of the crankshaft (200), and an outer ring of the third bearing (220) is matched with an inner side wall of the output disc (600).
10. 10. The internal friction wheel reducer according to any one of claims 1 to 7, characterized in that an outer side wall of the output disc (600) is sleeved with a fourth bearing (630), an inner ring of the fourth bearing (630) is matched with the output disc (600), and an outer ring of the fourth bearing (630) is matched with the base (100).

Description

Internal friction wheel speed reducer Technical Field The invention relates to the technical field of speed reducers, in particular to an internal friction wheel speed reducer. Background The friction transmission is a mechanical transmission mode for realizing power and motion transmission by utilizing the friction force between two or more wheel bodies pressed mutually, the speed reducer is a speed reduction transmission device which is enclosed in a rigid shell and used between a driving element and a working machine, and is a core independent component for realizing rotation speed matching and torque transmission. The friction wheel speed reducer combines the functional characteristics of friction transmission and the speed reducer, can effectively protect weak parts in a transmission system by virtue of the inherent advantage of slipping in overload, has good application potential in the field of precise transmission with definite requirements on safety protection, and is particularly suitable for key scenes such as robot joints with limited installation space and high transmission stability requirements. The conventional friction wheel speed reducer generally adopts a conventional plane friction structure, the structure is limited by the design of the structure, the positive pressure lifting way of a friction pair contact surface is single, if the radial pressure is simply increased, the load of a shaft and a bearing is increased, the size of the mechanism is increased, the compactness and the transmission requirement cannot be considered, the friction force meeting the actual transmission requirement is difficult to obtain in small space scenes such as a robot joint, and the problem of insufficient transmission capability is directly caused. Disclosure of Invention The invention aims to overcome the defect that the prior art cannot meet the requirements of compactness and transmission and is difficult to obtain enough friction force, and provides the internal friction wheel speed reducer which increases the positive pressure between friction pairs, improves the transmission capacity, has a compact structure and is suitable for precise transmission occasions with limited installation space. In order to solve the technical problems, the invention adopts the following technical scheme: The utility model provides an interior friction pulley reduction gear, including base, bent axle, interior friction pulley, outer friction pulley and output disc, the eccentric shaft section of bent axle with interior friction pulley is connected, outer friction pulley is including mutually supporting and being split type first outer friction pulley and the second outer friction pulley that sets up, first outer friction pulley and second outer friction pulley are all installed on the base, first outer friction pulley with all be provided with the slope friction surface on the second outer friction pulley, first outer friction pulley with be provided with between the second outer friction pulley by the V die cavity that the slope friction surface constitutes, interior friction pulley set up in the V die cavity, interior friction pulley's lateral wall with V die cavity laminating forms V type friction pair, the output disc with interior friction pulley is connected. The inner friction wheel speed reducer inputs power through a crankshaft arranged on a base, the crankshaft drives the inner friction wheel to regularly revolve in a V-shaped cavity formed by a first outer friction wheel and a second outer friction wheel through an eccentric shaft section structure, and because the outer side wall of the inner friction wheel is tightly attached to inclined friction surfaces correspondingly arranged on the first outer friction wheel and the second outer friction wheel, the V-shaped friction pair with self-friction increasing characteristics is formed by the inner friction wheel, the outer side wall and the inclined friction surfaces, namely when a compression force is applied through an axial direction, the inclined friction surfaces decompose the axial force into normal positive pressure perpendicular to a contact surface, and the magnitude of the friction force is in direct proportion to the normal positive pressure according to a friction transmission principle, so that the V-shaped structure can obtain larger friction force than the plane friction pair under the same axial compression force. Under the action of friction force, the internal friction wheel is driven to generate rotation while revolving, and the rotation motion smoothly outputs power outwards through an output disc directly connected with the internal friction wheel. The invention has compact structure and strong transmission capability, the positive pressure between friction pairs is obviously increased by adopting the V-shaped structure design of the cooperation of the inner friction wheel and the outer friction wheel and utilizing the wedge effect, the struct