CN202118224U

CN202118224U - Speed changing and gear shifting mechanism

Info

Publication number: CN202118224U
Application number: CN2011202095366U
Authority: CN
Inventors: 谢春干
Original assignee: Yangzhou Weibang Garden Machine Co Ltd
Current assignee: Yangzhou Weibang Garden Machine Co Ltd
Priority date: 2011-06-21
Filing date: 2011-06-21
Publication date: 2012-01-18
Anticipated expiration: 2021-06-21

Abstract

The utility model relates to a speed changing and gearing shifting mechanism, which comprises a sliding key shaft and a group of gear-position gears sleeved on the sliding key shaft. Gear key grooves are respectively arranged in inner holes of each gear-position gear, and separating rings are respectively arranged among the gear-position gears. A sliding key groove is arranged on the sliding key shaft, a sliding key is arranged in the sliding key groove and can slide axially in the sliding key groove, and the tail portion of the sliding key is provided with a sliding key pulling ring which drives the sliding key to move. A sliding key head of the sliding key is embedded in the gear key groove of each gear-position gear, and the sliding key is in a rigid beam structure. A groove is arranged at the upper end of the tail portion of the sliding key, and an elastic steel wire retaining ring is embedded in the groove and used for fixing the tail portion of the sliding key on the sliding key pulling ring. A circular arc protrusion serving as a lower fulcrum is arranged at the bottom of the sliding key, and the circular arc protrusion is arranged between the sliding key head and the groove and close to the groove. The sliding key pulling ring drives the sliding key to move, the sliding key head rotates around the lower fulcrum of the sliding key by means of elasticity of the elastic steel wire retaining ring of the sliding key, thereby enabling the sliding key head to be pushed downwards or be raised so as to be separated from or jointed with the gear-position gears and achieving gear shifting function.

Description

A kind of gear shift mechanism

Technical field

The utility model relates to a kind of gear shift mechanism, belongs to the speed changer technical field.

Background technique

Existing gear shift mechanism comprises sliding key shaft and is enclosed within one group of shift gear on the sliding key shaft; Each shift gear has different velocity ratios, and the endoporus of each shift gear is respectively equipped with the gear keyway that cooperates with the feather key head, is respectively equipped with spacer ring between each shift gear; Sliding key shaft is provided with featherway; Feather key is arranged in featherway and can endwisely slips along featherway, and the afterbody of feather key is provided with and drives the feather key draw ring that feather key moves, and the feather key head of feather key is inserted in the gear keyway of shift gear.Feather key is the elastic beam structure, and when feather key breaks away when moving to shift gear one, the spacer ring between two shift gears forces the feather key head to press down; Cross spacer ring and arrive another gear position, owing to the shift gear sky is enclosed within on the sliding key shaft, when this shift gear turns over several angle; The gear keyway aligns with elasticity feather key head, under the effect of elastic force, and the gear keyway that the feather key head is upspring and is inserted into this shift gear; Through the feather key head power is passed to sliding key shaft, make the sliding key shaft rotation, realized gear shift.

There is following deficiency in this gear shift mechanism: lean on the elasticity realization feather key head of feather key thin-walled and combining of gear keyway fully, this has limited feather key must have certain length to satisfy its deciliter stroke; If shorten feather key, for the elasticity that guarantees feather key will cause its strength deficiency, easy-rupturing, poor reliability for the boundary dimension of controlling casing.In addition, also have the way of cushioning spring under feather key, though can shorten feather key owing on radial dimension, increase spring, this can increase radial dimension, and difficult when assembling.

The model utility content

The purpose of the utility model is, overcomes the problem that exists in the existing technology, provides a kind of reliability high, non-damageable gear shift mechanism.

For solving above technical problem, the utility model provided a kind of gear shift mechanism comprises sliding key shaft and is enclosed within one group of shift gear on the sliding key shaft; The endoporus of each shift gear is respectively equipped with the gear keyway; Be respectively equipped with spacer ring between each shift gear, said sliding key shaft is provided with featherway, is provided with feather key in the said featherway; Said feather key can slide in featherway vertically; The afterbody of said feather key is provided with and drives the feather key draw ring that feather key moves, and the feather key head of said feather key is inserted in the gear keyway of said shift gear, and said feather key is the rigid beam structure; The afterbody upper end of said feather key is provided with groove; Be embedded with the elastic wire back-up ring in the said groove feather key afterbody is fixed on the said feather key draw ring, the bottom of said feather key is provided with as the circular arc of lower fulcrum protruding, and said circular arc convexity is between feather key head and groove and near said groove.

With respect to existing technology; The utility model has been obtained following beneficial effect: on the feather key draw ring with the fixing feather key of elastic wire back-up ring; Drive feather key and move together, the feather key head is under the contraction elasticity effect of the elastic wire back-up ring on the feather key draw ring, and the circular arc convexity bottom feather key is that fulcrum upwarps; The separating tooth wheel key way that when the feather key head moves to the spacer ring position, is depressed when moving to gear keyway position, with needed shift gear keyed engagement transferring power, thereby is realized feather key gearshift function; Such feather key does not need itself resiliently deformable, and intensity is high, is not easy fracture, good reliability.

Description of drawings

Fig. 1 is the structural representation of the utility model gear shift mechanism.

Among the figure: 1 first shift gear, 1a gear keyway, 2 second shift gears, 3 the 3rd shift gears, 4 spacer rings, 5 feather keys, 6 elastic wire back-up rings, 7 feather key draw rings, 8 sliding key shafts.

Embodiment

As shown in Figure 1, the gear shift mechanism of the utility model comprises sliding key shaft and is enclosed within one group of shift gear on the sliding key shaft; Promptly the endoporus of first shift gear 1, second shift gear 2 and the 3rd shift gear 3, the first shift gears 1 is provided with gear keyway 1a, and the endoporus of all the other shift gears is respectively equipped with the gear keyway; Be respectively equipped with spacer ring 4 between each shift gear, sliding key shaft 8 is provided with featherway, is provided with feather key 5 in the featherway; Feather key 5 can slide in featherway vertically, and the afterbody of feather key 5 is provided with and drives the feather key draw ring 7 that feather key moves, and the feather key head of feather key 5 is inserted among the gear keyway 1a of first shift gear 1; Feather key is the rigid beam structure; The afterbody upper end of feather key is provided with groove, is embedded with elastic wire back-up ring 6 in the groove feather key afterbody is fixed on the feather key draw ring 7, and the bottom of feather key 5 is provided with as the circular arc of lower fulcrum protruding; The circular arc convexity is between feather key head and groove and near groove, and elastic wire back-up ring 6 can make the feather key head produce swing by a relatively large margin with less action.

During gearshift, left side pulling feather key draw ring 7 drives feather key 5 and is moved to the left in figure; Spacer ring 4 presses down the feather key head; Feather key 5 is a fulcrum with the circular arc convexity of self bottom, and the elastic force that overcomes elastic wire back-up ring 6 rotates counterclockwise, and makes feather key 5 separate the position that the back arrives second shift gear 2 with first shift gear 1; Elastic wire back-up ring 6 is depressed the afterbody of feather key 5; Feather key 5 is that fulcrum clockwise rotates with the circular arc convexity of self bottom, lifts on the feather key head with second shift gear 2 to engage, and has realized feather key gearshift function.

Except that the foregoing description, the utility model can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop in the protection domain of the utility model requirement.

Claims

1. a gear shift mechanism comprises sliding key shaft and is enclosed within one group of shift gear on the sliding key shaft, and the endoporus of each shift gear is respectively equipped with the gear keyway; Be respectively equipped with spacer ring between each shift gear, said sliding key shaft is provided with featherway, is provided with feather key in the said featherway; Said feather key can slide in featherway vertically; The afterbody of said feather key is provided with and drives the feather key draw ring that feather key moves, and the feather key head of said feather key is inserted in the gear keyway of said shift gear, it is characterized in that: said feather key is the rigid beam structure; The afterbody upper end of said feather key is provided with groove; Be embedded with the elastic wire back-up ring in the said groove feather key afterbody is fixed on the said feather key draw ring, the bottom of said feather key is provided with as the circular arc of lower fulcrum protruding, and said circular arc convexity is between feather key head and groove and near said groove.