CN200999830Y

CN200999830Y - Pin-hole type small tooth difference planetary reducer for micromotor

Info

Publication number: CN200999830Y
Application number: CNU2007201234492U
Authority: CN
Inventors: 胡捷
Original assignee: CHONGQING CUKEN TECHNICAL Co Ltd
Current assignee: CHONGQING CUKEN TECHNICAL Co Ltd
Priority date: 2007-01-30
Filing date: 2007-01-30
Publication date: 2008-01-02
Anticipated expiration: 2017-01-30

Abstract

The utility model provides a small tooth number planetary wheel speed reducer used for micro motors. The utility model is comprised of an input axle, a casing body, an eccentric axle, pin axles, a front end cover, an output axle and an inner gear. The utility model is characterized in that the pin axles are evenly distributed on the periphery of the radial plate of the planetary wheel, and the pin axles and the planetary wheel are performed with interference fit. Pin holes are evenly distributed on the same radius on the disc of the output axle, and during the motion process of the wheel system, the front end of the pin axle performs a plate motion in the pin hole through the rolling bearing on the front end. The eccentric distance e of the eccentric axle, the diameter d of the pin axle and the diameter D of the pin hole meet the formula D=d+2e, and the rolling bearing is contacted with the pin hole constantly, therefore to drive the output axle to rotate with the planetary wheel synchronistically. The a small tooth number planetary wheel speed reducer reduces the radial direction size of the reducer, the utility model can realize seriation under the condition that the outer shape of the reducer keeps unchanged, and on the base of the structure, the miniature speed reducer can be designed to meet the micro motor system.

Description

A kind of micro motor hole-pin planetary speed reducer with small tooth number difference

Technical field

The utility model relates to a kind of planetary speed reducer with small tooth number difference, particularly a kind of micro motor hole-pin fewer differential teeth planetary wheel decelerator.

Background technique

Existing hole-pin fewer differential teeth planetary wheel decelerator mostly adopts the straight pin that is connected on pin-and-hole and the output shaft disk on the planet wheel disc to match as output mechanism, owing to must satisfy D=d+2e between the eccentric distance e of the diameter D in hole-pin planetary speed reducer with small tooth number difference hole, the diameter d of bearing pin, eccentric shaft, pin-and-hole is designed on the planet wheel disc, make that then the radial dimension of whole retarder is excessive, this retarder application area is restricted.

Summary of the invention

The purpose of this utility model is to propose a kind of micro motor planetary speed reducer with small tooth number difference at the existing excessive problem of retarder radial dimension, reduces the radial dimension of retarder.

A kind of micro motor is made up of input shaft, housing, eccentric shaft, planet wheel, bearing pin, front cover, output shaft and internal gear etc. with the fewer differential teeth planetary wheel decelerator.Input shaft and output shaft are on same axis, and output shaft is installed on the front cover by the output bearing.Eccentric shaft fixedly is housed on the input shaft, and input shaft and eccentric shaft are installed in the housing by the output bearing.Planet wheel is installed on the eccentric shaft by planetary bearing, and planet wheel is together done plane motion with input shaft under the driving of eccentric shaft.The sun gear internal gear is fixed in the housing, and planet wheel and internal gear are few tooth difference engaging gear transmission.Circumference is evenly distributed with bearing pin in the disc upper edge of planet wheel, and bearing pin and planet wheel are interference fit.The uniform pin-and-hole in same radius place on the disk of output shaft, then in the movement process of train, the front end of bearing pin is done plane motion by the rolling bearing on it in pin-and-hole.Wherein the diameter d of the eccentric distance e of eccentric shaft, bearing pin and pin-and-hole diameter D satisfy D=d+2e, and then rolling bearing remains with pin-and-hole and contacts, thereby drive output shaft along with planet wheel rotates synchronously in the same way.

This planetary speed reducer with small tooth number difference is connected in straight pin on the disc of planet wheel, pin-and-hole is then processed on the disk of output shaft, satisfying under the prerequisite of D=d+2e, reduced the radial dimension of retarder, be convenient to make retarder seriation under the constant situation of profile, can design miniature reducer in order to satisfy microelectromechanical-systems based on this structure.

Description of drawings

Fig. 1 is the axial sectional view of pin-and-hole formula planetary speed reducer with small tooth number difference.

Among the figure: the 1-input shaft; The 2-housing; 3-imports bearing; The 4-eccentric shaft; The 5-planetary bearing; The 6-planet wheel; The 7-bearing pin; 8 front covers; 9-exports bearing; The 10-output shaft; The 11-pin-and-hole; The 12-rolling bearing; The 13-internal gear.

Embodiment

Below in conjunction with drawings and Examples structure of the present utility model is described further:

Referring to Fig. 1, this fewer differential teeth planetary wheel decelerator is made up of input shaft 1, housing 2, eccentric shaft 4, planet wheel 6, bearing pin 7, front cover 8, output shaft 10 and internal gear 13 etc.Input shaft 1 and output shaft 10 are on same axis; Eccentric shaft 4 fixedly is housed on the input shaft 1; Planet wheel 6 is together done plane motion with input shaft 1 under the driving of eccentric shaft 4; Sun gear internal gear 13 is fixed in the housing 2; Planet wheel 6 is few tooth difference engaging gear transmission with internal gear 13; At even 8 bearing pins 7 that distribute of the disc upper edge of planet wheel 6 circumference, bearing pin 7 is an interference fit with planet wheel 6; Uniform 8 pin-and-holes 11 in same radius place on the disk of output shaft 10, in the movement process of train, the front end of bearing pin 7 is done plane motion by the rolling bearing on it 12 in pin-and-hole 11, rolling bearing 12 remains with pin-and-hole 11 and contacts, thereby drives output shaft 10 along with planet wheel 6 rotates synchronously in the same way; Input shaft 1 and eccentric shaft 4 are installed in the housing 2 by output bearing 3; Planet wheel 12 is installed on the eccentric shaft 4 by planetary bearing 5; Output shaft 10 is installed on the front cover by the output bearing.

Claims

1, a kind of micro motor hole-pin planetary speed reducer with small tooth number difference includes input shaft (1), housing (2), eccentric shaft (4), planet wheel (6), bearing pin (7), front cover (8), output shaft (10) and internal gear (11); Input shaft (1) and output shaft (10) are on same axis; Input shaft (1) is gone up eccentric shaft (4) fixedly is housed, and input shaft (1) and eccentric shaft (4) are installed in the housing (2) by output bearing (3); Planet wheel (12) is installed on the eccentric shaft (4) by planetary bearing (5), and planet wheel (6) is together done plane motion with input shaft (1) under the driving of eccentric shaft (4); Sun gear internal gear (11) is fixed in the housing (2), and planet wheel (6) is few tooth difference engaging gear transmission with internal gear (11); Output shaft (10) is installed on the front cover (8) by output bearing (9);

It is characterized in that: at the disc upper edge of planet wheel (6) the circumference bearing pin (7) that evenly distributes, bearing pin (7) was to win to cooperate with planet wheel (6); The same radius place is evenly equipped with pin-and-hole on the disk of output shaft (10), and the front end of bearing pin (7) is installed in the pin-and-hole by the rolling bearing on it (12); The diameter d of the eccentric distance e of eccentric shaft (4), bearing pin (7) and the diameter D of pin-and-hole satisfy D=d+2e.