CN202448774U

CN202448774U - Crosshead shoe gear system

Info

Publication number: CN202448774U
Application number: CN2011205491707U
Authority: CN
Inventors: 张润高; 童庆; 胡增来; 孙水全; 王瑞茂
Original assignee: Faurecia Shanghai Management Co Ltd
Current assignee: Faurecia China Holding Co Ltd
Priority date: 2011-12-23
Filing date: 2011-12-23
Publication date: 2012-09-26
Anticipated expiration: 2021-12-23

Abstract

The utility model aims to provide a crosshead shoe gear system which has the characteristics of compact structure and large output torque. A worm gear is provided with a worm gear eccentric shaft which extends out axially; the worm gear eccentric shaft bears a crosshead shoe and a planetary gear; chutes are formed in the outer peripheral edge of the crosshead shoe, and another chutes are formed in the inner peripheral edge of the crosshead shoe; a casing lug boss is arranged on a reduction gearbox casing and can slide in the second chutes; and a gear lug boss extending out of one side of the planetary gear is positioned in the chutes in the second linear direction of the crosshead shoe in a slidable manner; an output gear is an internal gear; the planetary gear is meshed with the output gear, and the gear numbers of the planetary gear and the output gear are the same, so that a planetary gear transmission mechanism is formed; the output gear is provided with an output shaft which penetrates into the central hole of the worm gear to bear the worm gear; the central hole of the worm gear is through the worm gear eccentric shaft; the worm gear can rotate freely on the output shaft; and the eccentricity of the worm gear eccentric shaft is equal to the center distance of the planetary gear transmission mechanism.

Description

The crosshead shoe gear train

Technical field

The utility model relates to speed reduction gearing, relates in particular to the speed reduction gearing that is used for angle regulator for automobile chair.

Background technology

Existing automobile seat backrest angle modulation actuating unit speed reduction gear box system, general pivotal joint by worm screw and motor.Realize the deceleration of the first order through the turbine and worm transmission of the first order; External toothing transmission through miniature gears and big gear wheel realizes partial deceleration again; Tradition angle modulation actr drop-gear box is simple in structure; But, can't realize automotive seat weight-saving design requirement because the external gear transmission need can't reduce volume than open landscape layout; Simultaneously owing to general external gear transmission is difficult to make big speed ratio, so be difficult to realize the design operating needs of large speed ratio.Be difficult to realize that seat motor actr is at a high speed than, the designing requirement of low weight.

The utility model content

The purpose of the utility model is to provide a kind of crosshead shoe gear train, and it has compact conformation, characteristics that output torque is big.

For realizing the crosshead shoe gear train of said purpose, comprise worm gear, worm screw, drop-gear box housing and gear box cover, worm gear and worm mesh; Be characterized in; Also comprise crosshead shoe, output gear and planetary wheel, worm gear has the worm gear eccentric shaft that axially stretches out, and the worm gear eccentric shaft is accepted crosshead shoe and planetary wheel; Crosshead shoe and planetary wheel all can freely rotate on the worm gear eccentric shaft; The outer peripheral edges of crosshead shoe respectively have chute at the two ends of first rectilinear direction, and the inner peripheral of crosshead shoe respectively has chute at the two ends of second rectilinear direction, and first rectilinear direction is vertical each other with second rectilinear direction; The drop-gear box housing has the housing boss of the chute of first rectilinear direction that is arranged in crosshead shoe, and the housing boss can move in chute; A planetary side is extended with the gear boss, and the gear boss is slidably located in the chute of second rectilinear direction of crosshead shoe; Output gear is an inner gear, and planetary wheel is different with output gear engagement and the two number of teeth, forms planetary gear mechanism; Output gear also has output shaft, and output shaft penetrates in the centre hole of worm gear, and to accept worm gear, the centre hole of worm gear runs through the worm gear eccentric shaft, and worm gear can freely rotate on output shaft; The eccentric throw of worm gear eccentric shaft equals the width between centers of planetary gear mechanism.

The crosshead shoe gear train of the utility model can be applicable to motor vehicle seat back angle modulation actr drop-gear box; Slow down through the worm and wormwheel formation first order, the crosshead shoe planetary gear mechanism constitutes the second stage and slows down, and output gear links to each other with the angle regulator for automobile chair connecting rod and fetches the backrest angle adjusting that realizes automotive seat; Utilized conventional turbine worm screw speed ratio big; Transmit the pulsation-free advantage, utilized small teeth number difference planet gear systems communicate speed ratio big again simultaneously, the characteristics that output torque is big; Same axis direction through each assembly of gear train is arranged, has saved the arrangement space of a large amount of gear trains.

Description of drawings

Fig. 1 is the decomposition view of crosshead shoe gear train.

Fig. 2 is the main pseudosection of crosshead shoe gear train.

Fig. 3 is the section-drawing along A-A line among Fig. 2.

The specific embodiment

To shown in Figure 3, the crosshead shoe gear train comprises worm gear 5, worm screw 3, drop-gear box housing 1 and gear box cover 2 like Fig. 1, worm gear 5 and worm screw 3 engagements, and worm screw 3 can be connected to motor through pivot 4.Worm gear 5 has the worm gear eccentric shaft 52 that axially stretches out, and worm gear eccentric shaft 52 is run through by the centre hole 52 of worm gear 5.Undertake crosshead shoe 6 and planetary wheel 7 on the worm gear eccentric shaft 52, crosshead shoe 6 is positioned on the worm gear eccentric shaft 52 with planetary wheel 7 all free to rotately.

Planetary wheel 7 and output gear 8 engagements, output gear 8 is an inner gear, planetary wheel 7 has the different numbers of teeth with output gear 8, so the planetary gear mechanism of the two formation is with the principle operation of the few tooth difference of epicyclic gear transmission, exportable bigger moment of torsion.The eccentric throw of worm gear eccentric shaft 52 is the width between centers (distances at planetary wheel 7 and output gear 8 the two center) of planetary gear mechanism.

As shown in Figure 3, a side of planetary wheel 7 is provided with gear boss 71, two gear boss 71 and distributes in the horizontal direction, and corresponding gear boss 71, the inner ring of crosshead shoe 6 have two chutes 62, and gear boss 71 is slidably located in the chute 62.Crosshead shoe 6 also respectively has chute 61 in the both sides of vertical direction, and slidably housing boss 19 is arranged in the chute 61, and housing boss 19 is formed in the drop-gear box housing 1.Because the position-limiting action of each boss and cooresponding chute, during 52 runnings of worm gear eccentric shaft, planetary wheel 7 can rotation on worm gear eccentric shaft 52, only can on output gear 8, carry out relative revolution.Each boss is at least the width between centers of planetary gear mechanism at the maximum sliding distance of cooresponding chute.

As depicted in figs. 1 and 2, the center of output gear 8 is extended with output shaft 81, accepts worm gear 5 on the output shaft 81, simultaneously drop-gear box housing 1 and drop-gear box this 2 also be undertaken on this output shaft 81, therefore, compact conformation.Worm gear 5 can be free to slide on output shaft 81.

During the work of crosshead shoe gear train; Worm screw 3 receives the moment of torsion of motor output; Transfer torque to worm gear 5, the worm gear eccentric shaft 52 of worm gear 5 transfers torque to planetary wheel 7 again, and planetary wheel 7 is around the line of centers revolution of output gear 8; Transfer torque to output gear 8, output gear 8 transfers torque to the recliner of automotive seat again through the structure of joining with output shaft 81.

Claims

1. the crosshead shoe gear train comprises worm gear, worm screw, drop-gear box housing and gear box cover, worm gear and worm mesh; It is characterized in that; Also comprise crosshead shoe, output gear and planetary wheel, worm gear has the worm gear eccentric shaft that axially stretches out, and the worm gear eccentric shaft is accepted crosshead shoe and planetary wheel; Crosshead shoe and planetary wheel all can freely rotate on the worm gear eccentric shaft; The outer peripheral edges of crosshead shoe respectively have chute at the two ends of first rectilinear direction, and the inner peripheral of crosshead shoe respectively has chute at the two ends of second rectilinear direction, and first rectilinear direction is vertical each other with second rectilinear direction; The drop-gear box housing has the housing boss of the chute of first rectilinear direction that is arranged in crosshead shoe, and the housing boss can move in chute; A planetary side is extended with the gear boss, and the gear boss is slidably located in the chute of second rectilinear direction of crosshead shoe; Output gear is an inner gear, and planetary wheel is different with output gear engagement and the two number of teeth, forms planetary gear mechanism; Output gear also has output shaft, and output shaft penetrates in the centre hole of worm gear, and to accept worm gear, the centre hole of worm gear runs through the worm gear eccentric shaft, and worm gear can freely rotate on output shaft; The eccentric throw of worm gear eccentric shaft equals the width between centers of planetary gear mechanism.