CN201901239U

CN201901239U - Four-gear transmission for bicycle center shaft

Info

Publication number: CN201901239U
Application number: CN2010206524525U
Authority: CN
Inventors: 徐志安
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-10
Filing date: 2010-12-10
Publication date: 2011-07-20
Anticipated expiration: 2020-12-10

Abstract

The utility model discloses a four-gear transmission for a bicycle center shaft. The four-gear transmission is characterized in that the center shaft, an auxiliary shaft and an output shaft are parallelly arranged in a case fixed onto a frame, a main gear is arranged at one end of the center shaft, the auxiliary shaft is axially provided with at least one groove, a pinion is disposed at a position, which is meshed with the main gear, on the auxiliary shaft, a gear A, a gear B and a gear C are sequentially disposed from one end with the pinion of the auxiliary shaft, a front shifting fork is arranged at a proper position of the gear B and fixed onto a front shaft sleeve, the output shaft is axially provided with at least one groove, a gear D is disposed at a position, which is meshed with the pinion, on the output shaft, a gear E, a shaft sleeve, a gear F and a gear G are sequentially arranged from one end with the gear D of the output shaft, a rear shifting fork is disposed at a proper position of the shaft sleeve and fixed onto a rear shaft sleeve, teeth are respectively arranged on one side of the front shaft sleeve and one opposite side of the rear shaft sleeve, the front shaft sleeve and the rear shaft sleeve are respectively fixed onto the case by the aid of a front long shaft and a rear long shaft, and a gear, which is simultaneously meshed with the front shaft sleeve and the rear shaft sleeve, is connected with a shift-up shifting wheel, a shift-down shifting wheel and a gear-position positioning wheel via a short shaft.

Description

Bicycle middle shaft four-speed gear shift device

Technical field

The utility model relates to a kind of change-speed box, relates in particular to a kind of bicycle middle shaft four-speed gear shift device.

Background technology

Bicycle is a kind of convenient, low-carbon (LC), environmental protection, is again a kind of vehicle that can improve the health, and its structure, shape are also in continuous changes and improvements.But " speed " problem is the improved key issue of bicycle always, no matter is in smooth downtown streets, and it is comfortable, laborsaving still all should to ride in rugged rural area." speed change " all do not have bigger improvement from the diameter of initial increasing active wheel disc so far to external " mountain bike " speed change, hindered its development.

The variable speed bicycle of Chu Shouing, mountain bike in the market, the conversion of its gear is one or two driving gear that utilizes on the axis, four to the multi-disc driven gear, be combined into the line speed conversion by chain and some actives to driven gear, shortcoming is that change speed is slow, friction is serious when certain group gear and chain engages, because driving wheel is by chain and flower wheel in-line not, chain and gear meshing wearing and tearing have increased the increasing of manpower by bike, impression is less than laborsaving, but also can damage change-speed box, chain, cause unnecessary loss.

Summary of the invention

The purpose of this utility model just provide a kind of with gear combination in a change speed gear box, reduce gear and dust direct contact, each transmission gear remains in-line during gearshift, makes that gearshift is free and relaxed, convenient, accurate, and use labour-saving bicycle middle shaft four-speed gear shift device.

The technical scheme of the utility model technical solution problem is to achieve these goals: it comprise the gearshift spanner that is fixed on the handlebar, with the flexible shaft line that this spanner links to each other, it is: be fixed in parallel axis, countershaft and the output shaft of being provided with in the casing on the vehicle frame; Described axis, countershaft and output shaft respectively by bearing fixing on casing, axis one end is provided with big gear wheel; Countershaft is provided with a groove vertically at least; The position that is meshed with big gear wheel on this countershaft is provided with miniature gears; Be provided with gear A gear B and gear C successively from close miniature gears one end on the countershaft; Described gear B adapting position is provided with preceding shift fork; Should be fixed on the front shaft sleeve by preceding shift fork, described output shaft is provided with a groove vertically at least; The position that is meshed with miniature gears on this output shaft is provided with gear D; Be provided with gear E, axle sleeve, gear F and gear G successively from close gear D one end on the output shaft; Described axle sleeve adapting position is provided with the back shift fork; This back shift fork is fixed on the rear axle housing, the relative side with rear axle housing of front shaft sleeve is provided with tooth, and be fixed on the casing by preceding major axis and back major axis respectively, with front shaft sleeve and rear axle housing simultaneously gears in mesh by minor axis with add, downshift turning wheel and gear locating wheel link to each other, the gearshift jig of describedly add, downshift turning wheel and gear locating wheel are outer with being fixed on casing is adjacent, and this gearshift jig links to each other with gearshift spanner on the handlebar by flexible shaft line.

Described gear A is provided with sleeve near gear B one side; This sleeve outer edge is made the ring of projection, and this sleeve is arranged with breach.

Described gear B is provided with socket near gear A one side; This socket outer edge is made the ring of projection, and this socket is arranged with breach, constitutes complete cylinder after the socket of described gear B and the sleeve of gear A are pegged graft.

Described gear A and gear B endoporus all are provided with a boss vertically at least, the groove of this boss and place countershaft is adaptive, after the socket of gear B and the sleeve of gear A were pegged graft, the made protruding ring place of its outward flange was provided with jump ring, and the cylinder outer ring is provided with spring.

Described gear E and gear F endoporus all are provided with a boss vertically at least, the groove of this boss and place output shaft is adaptive, gear E is provided with a projection to outer lug at least near gear D one side, and the pit of the respective shapes that the relative side with gear D of this projection is provided with is adaptive.

Described gear E and gear F and axle sleeve weldering are one.

Described gear F is provided with an arc voussoir that outwards protrudes at least near gear G one side, and the arc wedge mouth of the respective shapes that the relative side with gear G of this voussoir is provided with is pegged graft adaptive.

Described gear locating wheel is evenly to be provided with some arcs that concave on the circular wheel disc outer ring to constitute.

Describedly add, the downshift turning wheel is evenly to be provided with the identical blade tooth of some directions on the circular wheel disc outer ring to constitute.

Described gearshift jig comprises the locator card wheel that matches with the outer loop-shaped of gear locating wheel, and respectively with the left side gearshift claw and the right gearshift claw that add, the outer loop-shaped of downshift turning wheel matches.

The utility model compared with prior art has following advantage and effect:

Bicycle middle shaft four-speed gear shift device of the present utility model, it is unit design, power shift gear is combined in the change speed gear box, reduce gear and dust direct contact, each transmission gear remains in-line, owing to adopt forward and backward shift fork handsetting gear moving on corresponding axis, make that the various gear conversions of user are more free and relaxed, convenient, accurate, and laborsaving, simple and reasonable for structure, the utility model is suitable for travelling on the various road surfaces, convenient to a greater extent the use has social benefit and market outlook widely.

Description of drawings

Fig. 1 is the inner structure scheme drawing that the utility model cuts open casing one end casing.

Fig. 2 is the A-A sectional structure scheme drawing of the utility model Fig. 1.

Fig. 3 is the B-B sectional structure scheme drawing of the utility model Fig. 2.

Fig. 4 is that the C-C of the utility model Fig. 2 analyses and observe and removes structural representation behind the

part

25,26.

Fig. 5 is that the D-D of the utility model Fig. 2 analyses and observe and removes structural representation behind

part

25,26 and the

part

29,30.

Vital parts among the figure: casing 1, big gear wheel 2, axis 3, gear A 4, miniature gears 5, countershaft 6, preceding major axis 7, gear D 8, back major axis 9, output shaft 10, gear E 11, axle sleeve 12, back shift fork 13, gear F 14, gear 15, rear axle housing 16, gear G 17, minor axis 18, front shaft sleeve 19, jump ring 20, spring 21, preceding shift fork 22, gear C 23, gear B 24, gear locating wheel 25, locator card wheel 26, shift-up turning wheel 27, right gearshift claw 28, downshift turning wheel 29, left side gearshift claw 30, flexible shaft line 31.

The specific embodiment

Below in conjunction with specific embodiment the utility model is further elaborated, but protection domain of the present utility model is not limited by specific embodiment, is as the criterion with claims.In addition, with under the prerequisite of technical solutions of the utility model, any change or change that those of ordinary skills that the utility model is done realize easily all will fall within the claim scope of the present utility model.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4 and bicycle middle shaft four-speed gear shift device shown in Figure 5, it comprises the gearshift spanner that is fixed on the handlebar, the flexible shaft line 31 that links to each other with this spanner, be fixed in the casing 1 on the vehicle frame of bicycle middle shaft 3 positions, parallel axis 3, countershaft 6 and the output shaft 10 of being provided with in this casing; Axis 3, countershaft 6 and output shaft 10 respectively by bearing fixing on casing 1, axis 3 one ends are provided with big gear wheel fixed thereon 2; Countershaft 6 is provided with four grooves vertically; The position that is meshed with big gear wheel 2 on this countershaft 6 is provided with miniature gears fixed thereon 5; Be provided with gear A 4, gear B 24 and gear C 23 successively from close miniature gears 5 one ends on the countershaft 6; Described gear A 4 is fixed with sleeve near gear B 24 1 ends; Gear A 4 axially is equipped with four boss together with the endoporus of sleeve, and four grooves of this boss and place countershaft 6 are adaptive, and the sleeve outer edge of gear A 4 is made the ring of projection, and this sleeve is arranged with breach.Described gear B 24 is provided with socket near gear A 4 one sides; Gear B 24 axially is equipped with four boss together with the endoporus of socket, four grooves of this boss and place countershaft 6 are adaptive, the socket outer edge of gear B 24 is made the ring of projection, socket is arranged with breach, staggering mutually in the position of the breach on this breach and gear A 4 sleeves, constitutes complete cylinder after the sleeve of the socket of gear B 24 and gear A 4 is pegged graft.The made protruding ring place of sleeve and socket outward flange is provided with jump ring 20, and the cylinder outer ring is provided with spring 21, and gear A 4 and gear B 24 fuse by jump ring 20, and makes gear A 4 and gear B 24 spacings scalable.The socket adapting position of gear B 24 is provided with preceding shift fork 22, and the position of preceding shift fork 22 is between the shaft shoulder set on gear B 24 sides and the socket specifically, and preceding shift fork 22 is fixed on the front shaft sleeve 19.Output shaft 10 is provided with four grooves vertically; The position that is meshed with miniature gears 5 on this output shaft 10 is provided with the gear D 8 of idle running on output shaft 10; Be provided with gear E 11, axle sleeve 12, gear F 14 and gear G 17 successively from close gear D 8 one ends on the output shaft 10, gear E 11 and gear F 14 are one with axle sleeve 12 welderings, gear E 11 and gear F 14 endoporus axially are equipped with four boss, four grooves of these four boss and place output shaft 10 are adaptive, gear E 11 evenly is provided with four projections near gear D 8 one sides, and this projection is adaptive with the pit of the respective shapes that gear D 8 relative sides are provided with.Gear F 14 is arranged with two arc voussoirs that outwards protrude near gear G 17 1 sides, gear G 17 relative gear F 14 1 sides are provided with the tubular spare of protrusion, and the arc voussoir that this tubular spare is provided with on this arc arc wedge mouth and the described gear G 17 is pegged graft adaptive.Axle sleeve 12 adapting positions are provided with back shift fork 13; The position of back shift fork 13 is between the shaft shoulder set on gear F 14 sides and the axle sleeve 12 specifically, this back shift fork 13 is fixed on the rear axle housing 16, front shaft sleeve 19 is provided with tooth with rear axle housing 16 relative sides, and be fixed on the casing 1 after being set on preceding major axis 7 and the back major axis 9, with front shaft sleeve 19 and rear axle housing 16 simultaneously gears in mesh 15 by minor axis 18 with add, downshift turning

wheel

27,29 and gear locating wheel 25 link to each other, gear locating wheel 25 is for evenly being provided with some arcs formations that concave on the circular wheel disc outer ring; Add, downshift turning

wheel

27,29 constitutes for evenly being provided with the identical blade tooth of some directions on the circular wheel disc outer ring.The gearshift jig of describedly add, downshift turning

wheel

27,29 and gear locating wheel 25 are outer with being fixed on casing 1 is adjacent, the gearshift card has the locator card wheel 26 that matches with gear locating wheel 25 outer loop-shaped, and respectively with add, a left side that downshift turning

wheel

27,29 outer loop-shaped match gearshift claw 30 and the right claw 28 of shifting gears, a relative side of left side gearshift claw 30 is provided with extension spring, right gearshift claw 28 relative sides also are provided with extension spring, and this gearshift jig links to each other with gearshift spanner on the handlebar by the flexible shaft line 31 that is connected in the left side gearshift claw 30 and the right side and shifts gears on the claw 28.

During concrete the use:

Be illustrated in figure 1 as one grade of initial position of the present utility model, axis 3 drives big gear wheel 2 and forwards to, big gear wheel 2 drives miniature gears 5 and forwards to, miniature gears 5 driven gear D 8 forward to and also drive countershaft 6 rotations simultaneously, four projections that evenly are provided with near gear D 8 one sides by gear E 11 are pegged graft in the pit with the respective shapes of gear D 8 relative sides, thereby driven gear E 11 rotations, four boss that gear E 11 endoporus are axially arranged with drive output shaft 10 rotations.When needs are shifted gears:

1, moves gearshift spanner on the handlebar, spur the right side gearshift claw 28 of gearshift jigs by the flexible shaft line 31 that is connected in spanner, right gearshift claw 28 is stuck in the blade tooth of a shift-up turning wheel 27, by gear 15 clickwises on the right side gearshift claw 28 drive minor axises 18, gear 15 drives front shaft sleeve 19 simultaneously and rear axle housing 16 moves inward, and shift fork 22 moves right before promptly driving; Back shift fork 13 is moved to the left, preceding shift fork 22 moves right by shaft shoulder driven gear B 24 and gear A 4 on the gear B 24 side sockets, back shift fork 13 is moved to the left by gear F 14 side driven gear E 11 and gear F 14 simultaneously, thereby make gear A 4 and gear E 11 engagements, be two P PARK Position Ps of the present utility model this moment.

2, continue to move gearshift spanner on the handlebar, spur the right side gearshift claw 28 of gearshift jigs by the flexible shaft line 31 that is connected in spanner, right gearshift claw 28 is stuck in the blade tooth of next shift-up turning wheel 27, by gear 15 clickwises on the right side gearshift claw 28 drive minor axises 18, gear B 24 and gear A 4 continue to move right, gear E 11 and gear F 14 are moved to the left simultaneously, gear A 4 is separated with gear E 11, thereby make gear B 24 and gear E 11 engagements, be three P PARK Position Ps of the present utility model this moment.

3, continue to move gearshift spanner on the handlebar again, spur the right side gearshift claw 28 of gearshift jigs by the flexible shaft line 31 that is connected in spanner, right gearshift claw 28 is stuck in the blade tooth of next shift-up turning wheel 27 again, by gear 15 clickwises on the right side gearshift claw 28 drive minor axises 18, gear B 24 is separated with gear E 11, and this moment, gear A 4 was close together with miniature gears 5; The socket of gear B 24 all is plugged on the sleeve of gear A (4), gear F 14 is plugged near two arc voussoirs that outwards protrude of gear G 17 1 side symmetries in the arc wedge mouth of respective shapes of gear G 17 relative sides, gear C 23 is driven gear F 14 rotations by being meshed with gear G 17, thereby drive output shaft 10 rotations, realize fourth gear of the present utility model position.

Move the gearshift spanner on the handlebar during downshift, spur the left side gearshift claw 30 of gearshift jigs by the flexible shaft line 31 that is connected in spanner, left side gearshift claw 30 is stuck in the blade tooth of a downshift turning wheel 29, drive downshift turning wheel 29, drive the gear 15 inverse clocks rotation on the minor axis 18 by left side gearshift claw 30, realize the utility model downshift process.Other third gear, second gear and one grade are not being given unnecessary details for the above-mentioned inverse process that increases shelves.

Claims

1. bicycle middle shaft four-speed gear shift device, it comprises the gearshift spanner that is fixed on the handlebar, the flexible shaft line (31) that links to each other with this spanner, it is characterized in that: be fixed in parallel axis (3), countershaft (6) and the output shaft (10) of being provided with in the casing (1) on the vehicle frame; Described axis (3), countershaft (6) and output shaft (10) respectively by bearing fixing on casing (1), axis (3) one ends are provided with big gear wheel (2); Countershaft (6) is provided with a groove vertically at least; The last position that is meshed with big gear wheel (2) of this countershaft (6) is provided with miniature gears (5); Countershaft (6) is gone up from being provided with gear A (4), gear B (24) and gear C (23) successively near miniature gears (5) one ends; Described gear B (24) adapting position is provided with preceding shift fork (22); Should be fixed on the front shaft sleeve (19) by preceding shift fork (22), described output shaft (10) is provided with a groove vertically at least; The last position that is meshed with miniature gears (5) of this output shaft (10) is provided with gear D (8); Output shaft (10) is gone up from being provided with gear E(11 successively near gear D (8) one ends), axle sleeve (12), gear F(14) and gear G(17); Described axle sleeve (12) adapting position is provided with back shift fork (13); This back shift fork (13) is fixed on the rear axle housing (16), the relative side with rear axle housing (16) of front shaft sleeve (19) is provided with tooth, and be fixed on the casing (1) by preceding major axis (7) and back major axis (9) respectively, with front shaft sleeve (19) and rear axle housing (16) simultaneously gears in mesh (15) by minor axis (18) and add, downshift turning wheel (29,30) and gear locating wheel (25) link to each other, described adding, downshift turning wheel (27,29) and gear locating wheel (25) the gearshift jig outer with being fixed on casing (1) adjacent, this gearshift jig links to each other with gearshift spanner on the handlebar by flexible shaft line (31).

2. bicycle middle shaft four-speed gear shift device according to claim 1 is characterized in that described gear A (4) is provided with sleeve near gear B (24) one sides; This sleeve outer edge is made the ring of projection, and this sleeve is arranged with breach.

3. bicycle middle shaft four-speed gear shift device according to claim 1 is characterized in that described gear B (24) is provided with socket near gear A (4) one sides; This socket outer edge is made the ring of projection, and this socket is arranged with breach, constitutes complete cylinder after the sleeve of the socket of described gear B (24) and gear A (4) is pegged graft.

4. according to claim 1,2 or 3 described bicycle middle shaft four-speed gear shift devices, it is characterized in that described gear A (4) and gear B (24) endoporus all are provided with a boss vertically at least, the groove of this boss and place countershaft (6) is adaptive, after the sleeve of the socket of gear B (24) and gear A (4) is pegged graft, the made protruding ring place of its outward flange is provided with jump ring (20), and the cylinder outer ring is provided with spring (21).

5. bicycle middle shaft four-speed gear shift device according to claim 1, it is characterized in that described gear E(11) and gear F(14) endoporus all is provided with a boss vertically at least, the groove of this boss and place output shaft (10) is adaptive, gear E(11) be provided with a projection to outer lug at least near gear D (8) one sides, the pit of the respective shapes that the relative side with gear D (11) of this projection is provided with is adaptive.

6. bicycle middle shaft four-speed gear shift device according to claim 1 or 5 is characterized in that described gear E(11) and gear F(14) be one with axle sleeve (12) weldering.

7. bicycle middle shaft four-speed gear shift device according to claim 1, it is characterized in that described gear F(14) near gear G(17) side is provided with an arc voussoir that outwards protrudes, this voussoir and gear G(17 at least) the arc wedge mouth grafting of the respective shapes that is provided with of a relative side is adaptive.

8. bicycle middle shaft four-speed gear shift device according to claim 1 is characterized in that described gear locating wheel (25) constitutes for evenly being provided with some arcs that concave on the circular wheel disc outer ring.

9. bicycle middle shaft four-speed gear shift device according to claim 1 is characterized in that describedly adding, downshift turning wheel (27,29) constitutes for evenly being provided with the identical blade tooth of some directions on the circular wheel disc outer ring.

10. bicycle middle shaft four-speed gear shift device according to claim 1, it is characterized in that described gearshift jig comprises the locator card wheel (26) that matches with the outer loop-shaped of gear locating wheel (25), and respectively with add, claw (28) is shifted gears on left side gearshift claw (30) that the outer loop-shaped of downshift turning wheel (27,29) matches and the right side.