CN1187218C

CN1187218C - Three-speed internal speed variator for rear shaft of bicycle

Info

Publication number: CN1187218C
Application number: CNB021373388A
Authority: CN
Inventors: 陆颂荫
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-28
Filing date: 2002-09-28
Publication date: 2005-02-02
Anticipated expiration: 2022-09-28
Also published as: CN1405053A

Abstract

The present invention discloses a three-speed inner speed changer for a rear shaft of a bicycle, which is composed of a rear shaft roller (1), a left thorn seat (6), a shell body (7), a right cover (14), a rolling bearing (15), a right thorn seat (17), a chain wheel (23), a speed adjusting mechanism, a planetary gear transmission mechanism, a clutch mechanism, etc. The three-speed inner speed changer for a rear shaft of a bicycle is characterized in that interference fit connection is adopted by the left end of the shell body (7) and the left thorn seat (6). Thread connection is adopted by the right end of the shell body (7) and the right cover (14). The rolling bearing (15) is arranged between an inner hole of the right cover (14) and the outer column surface of the right thorn seat (17) to form rolling connection. Fast, medium, and low gear output speed is obtained through control to the speed adjusting mechanism. The three-speed inner speed changer for a rear shaft of a bicycle has the advantages that an axial swing phenomenon of a rear shaft of a bicycle in the running process is eliminated, the stability of the rotary movement of the rear shaft of the bicycle is improved, and the use reliability and the safety performance of the three-speed inner speed changer for a rear shaft of a bicycle are enhanced.

Description

Three-speed internal speed variator for rear shaft of bicycle

Technical field

The present invention relates to a kind of internal speed changer of bicycle rear axle, particularly relate to a kind of internal speed changer of bicycle rear axle third speed.

Background technology

At present, the product category of the internal speed changer of bicycle rear axle is various, just like the patent No. 96243571.6 disclosed types, it comprises: housing 8, rear axletree 1, left ratchet seat 7, right ratchet seat 18, back sprocket wheel 19, by spiral nail 2, spring 3, left and right pins 23, middle push rod 25, the regulating mechanism that outer push rod 22 is formed, by pinion carrier 14, planetary wheel 12, gear ring 11, the epicyclic transmission mechanism that sun gear 15 is formed, by very heavy axle 30, long, short very heavy 27, the engaging and disengaging gear of 28 each a pair of composition etc., referring to shown in Figure 2: by control to regulating mechanism, make the length very heavy 27 of engaging and disengaging gear obtain three kinds of states, form output third gear height, in, low different rotating speed.The internal speed changer of this bicycle rear axle has been widely used in the bicycle product of various variable-ratios, but it has following shortcoming in use: because left ratchet seat 7 and right ratchet seat 21 are to be supported on the axle shelves 5 by ball 6, the ball road geometric accuracy and the roughness of surface of then above-mentioned left ratchet seat, right ratchet seat and axle shelves will directly influence the stability of bicycle rear axle gyroscopic movement, and above-mentioned raceway processing technology with complex outline part is to be difficult to satisfy high-precision requirement; Secondly, housing 8 left ends of the type product are connected with left ratchet seat 7 usefulness left-hand threads, when bicycle brakes rapidly, owing to will overcome the force of inertia of its bicycle rear axle, housing 8 left ends get loose for making to be threaded with the antagonistic force that the left-hand thread junction of left ratchet seat 7 produces, thereby cause potential operating troubles of three-speed internal speed variator for rear shaft of bicycle and insecurity.

Summary of the invention

Technical matters to be solved by this invention is to avoid the defective of prior art, provides a kind of stability of bicycle rear axle gyroscopic movement good, stops to get loose housing and left ratchet seat being connected between the two and cause potential operating troubles and improve the three-speed internal speed variator for rear shaft of bicycle of its serviceability and safety.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: case of transmission left end endoporus adopts interference fit to be connected with the outer cylinder surface of left ratchet seat, the case of transmission right-hand member by with its be threaded useful be installed in right lid endoporus in antifriction-bearing box form and be connected with the rolling of right ratchet seat, right ratchet seat is equipped with outward by back-up ring axial location and the mutual back sprocket wheel that fastens, left and right sour jujube seat is rotatably connected by the left and right axle bumper of steel ball with the band dust ring again, left and right axle bumper adopts with rear axletree and is threaded, and by thin nut and tight; Be provided with the regulating mechanism that is subjected to outer effector control in the rear axletree, the transmission of intermeshing of the sun gear at rear axletree middle part and the planetary gear mechanism that is arranged on middle part in the housing, the engaging and disengaging gear that is symmetrical set in the planetary gear mechanism both sides is subjected to the speed governing mechanism controls to form many grades of output speeds.

Compared with prior art, the invention has the advantages that and eliminated the axial wobble phenomenon of bicycle rear axle in operational process that the stability of bicycle rear axle gyroscopic movement is improved, and has improved reliability of operation and safety.

Description of drawings

Fig. 1 is an integral structure scheme drawing of the present invention;

Fig. 2 is the integral structure scheme drawing of prior art;

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Fig. 1 is an integral structure scheme drawing of the present invention.The housing 7 of internal speed variator for cycle rear axle is formed integral type by middle axle housing and both sides floral disc, its left end adopts interference fit to be connected with left ratchet seat 6, when bicycle was braked in the process of riding rapidly, housing 7 left ends and left ratchet seat 6 tightly kept one and skidding can not take place.The right-hand member of housing 7 by being connected close-fitting with its fine thread right side lid 14 and be installed in that antifriction-bearing box 15 between the outer cylinder surface of right lid endoporus and right ratchet seat 17 forms and right ratchet seat 17 is rotatably connected, avoided housing 7 directly to be rotatably connected by steel ball and right ratchet seat 17, thereby avoided the steel ball rolling channel processing technology of the complex outline part of right lid 14 and right ratchet seat 17 to be difficult to satisfy high-precision requirement, and machining deformation and steel ball rolling channel hardness defect of insufficient.Outside the right ratchet seat 17 sprocket wheel 23 is housed, and fastens mutually, realize transmission of power by 18 axial location of the back-up ring in the groove.Left and right sour jujube seat 6,17 is rotatably connected by steel ball 19 left and right axle bumper 5,5 ' formations with band dust ring 20 again, and left and right axle bumper 5,5 ' with rear axletree 1 two ends is threaded and by nut 4 also tightly.

Be provided with the regulating mechanism that is subjected to the control of external control device in the rear axletree, the sun gear 13 at rear axletree middle part and the transmission device engaged transmission that is located at the planetary wheel 11 at middle part in the housing, the engaging and disengaging gear that is symmetrical set in the planetary gear mechanism both sides is subjected to the speed governing mechanism controls to form many grades of output speeds.

Rear axletree 1 is a tubulose part in addition, and two supports is spirally connected on left and right axle bumper 5 and with it, and the sun gear 13 at middle part is to be interference fitted on the axle journal of rear axletree middle part.

Regulating mechanism is contained in the rear axletree 1, controlled by the external control device, comprise from left to right screw 2, spring 3, left and right pin 22, middle push rod 25, outer push rod 21, left and right pin is pressed into respectively in the left and right speed governing cover 24 that is contained on the rear axletree, and pass key shape through hole on the rear axletree and limit left and right speed governing cover 24 and in key shape through hole length, slide, reach the speed setting purpose, because it is cone structure that 24 front ends are overlapped in left and right speed governing, slip into easily, no matter bicycle remains static or the high-speed cruising state, all can carry out speed governing.

Planetary gear mechanism is arranged on the centre in the housing 7, comprise 3 planetary wheels 11 that are meshed with sun gear 13 and gear ring 10 simultaneously are housed in the pinion carrier 26, planetary wheel is contained on the planet pin 12 and is connected with its moving joining, and the two ends close-fitting of planet pin 11 is in pinion carrier 26, and gear ring 10 and pinion carrier 26 both sides all are processed with Baltimore groove.

Engaging and disengaging gear is symmetrical set the both sides at planetary gear mechanism, comprise a pair of length very heavy 29 and a pair of weak point very heavy 28 that are contained on the left and right very heavy axle 27, and left and right very heavy axle 27 is separately fixed in the left and right sour jujube seat 6,17, inner spinous ring 9 is contained in the outer sour jujube circle 8, all have boss structure on the end face of inside and outside sour jujube circle, can be engaged with the Baltimore groove of gear ring 10, pinion carrier 26 both sides.Length very heavy 29 on the very heavy axle 27 in a left side is enclosed 8 interlocks with outer sour jujube, weak point very heavy 28 and inner spinous ring 9 interlocks; And length very heavy 29 and inner spinous ring 9 interlocks on the right very heavy axle 27, weak point very heavy 28 encloses 8 interlocks with outer sour jujube; Between a left side (or right) sour jujube seat and length (or short) are very heavy and a left side (or right) sour jujube seat be equipped with respectively between very heavy with weak point (or length) and act on long and short very heavy spring 30 on very heavy, it makes long and short very heavyly flick outside axial around very heavy.

The outer effector of control when needing speed governing, promote outer push rod 21, promote speed governing cover 24 through middle push rod 25, left and right pin 22, overlap residing diverse location according to speed governing, make long very heavy 29 full interlocks or the relieving of an end interlock one end or decontrol three kinds of states entirely, form three kinds of friction speeds.When speed governing cover 24 was in extreme right position, long very heavy 29 full interlocks were fast shelves transmission speed; When speed governing cover 24 was in the midway location of key shape through hole, the length on the left ratchet seat 6 very heavy 29 was decontroled, and the very heavy interlock of the length in the right ratchet seat 17 is middle-grade transmission speed; When speed governing cover 24 was in the left end end position, long very heavy 29 full relievings were slow shelves transmission speed, and concrete drive connection is as follows:

1. fast shelves transmission: the back sprocket rotation drives right ratchet seat and rotates, the very heavy interlock of length in the right ratchet seat, the right inner spinous ring rotates, and drives pinion carrier and rotates, and planetary wheel is done rotation and revolved round the sun, this moment, gear ring rotated and speedup, the outer sour jujube circle in the right skids, and the sour jujube circle rotates outside the left side, and left side inner spinous ring skids, long very heavy interlock in the left ratchet seat drives left ratchet seat and housing and rotates synchronously.

2. middle-grade transmission: the back sprocket rotation drives right ratchet seat and rotates, and long very heavy interlock drive the right inner spinous ring rotates in the right ratchet seat, and pinion carrier is rotated again, this time-division two-way, one tunnel left side inner spinous ring rotates, and the very heavy interlock of the weak point in the left ratchet seat drives left ratchet seat and housing and rotates synchronously; Another road planetary wheel is done rotation and revolution, makes the gear ring speedup, and the outer sour jujube circle in the right is skidded, and makes long very heavy the opening in the left side simultaneously, makes sour jujube circle idle running outside the left side.

3. slow shelves transmission: the back sprocket rotation drives right ratchet seat and rotates, make the very heavy relieving of length in the right ratchet seat, the right inner spinous ring idle running, and the short very heavy interlock in the right, outer sour jujube circle rotates and drives the gear ring rotation on the right of making, and the idle running of sour jujube circle makes the long very heavy relieving in the left side outside the left side at this moment, and the rotation drive planetary wheel rotation of gear ring makes the pinion carrier deceleration transmission, left side inner spinous ring rotates and makes the short very heavy interlock in the left side, drives left ratchet seat and housing and rotates synchronously.

Claims

1. three-speed internal speed variator for rear shaft of bicycle, it comprises: rear axletree (1), a left side, right axle bumper (5), (5 '), left ratchet seat (6), housing (7), right lid (14), antifriction-bearing box (15), right ratchet seat (17), sprocket wheel (23), described housing (7) is formed integral type by middle axle housing and both sides floral disc, its in-to-in is equipped with regulating mechanism, planetary gear mechanism, engaging and disengaging gear, described left ratchet seat (6) is installed on respectively on the left side and right side floral disc of described housing (7) with right ratchet seat (17), described rear axletree (1) is installed on a described left side, right axle bumper (5), in (5 '), described sprocket wheel (23) is contained on the external cylindrical surface of right ratchet seat (17), and, it is characterized in that by the back-up ring in the groove (18) axial location:

The left end of a. described housing (7) adopts interference fit to be connected with left ratchet seat (6);

The right-hand member of b. described housing (7) adopts with You Gai (14) and is threaded:

Device has antifriction-bearing box (15) formation rolling to be connected between the outer cylinder surface of c. described right lid (14) endoporus and right ratchet seat (17).

2. three-speed internal speed variator for rear shaft of bicycle as claimed in claim 1 is characterized in that: it is the interference fit connection of band straight-tooth shape profile that the left end of described housing (7) is connected with the interference fit of left ratchet seat (6).

3. three-speed internal speed variator for rear shaft of bicycle as claimed in claim 1 is characterized in that: it is that left-hand thread is connected that the right-hand member of described housing (7) is threaded with You Gai (14) employing.

4. three-speed internal speed variator for rear shaft of bicycle as claimed in claim 1 is characterized in that: to be connected be single row ball bearing (15) radially in rolling between the outer cylinder surface of described right lid (14) endoporus and right ratchet seat (17).