CN2412837Y

CN2412837Y - Mid-axle speed increaser for bicycle

Info

Publication number: CN2412837Y
Application number: CN 99250627
Authority: CN
Inventors: 郭广富
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-10
Filing date: 1999-12-10
Publication date: 2001-01-03
Anticipated expiration: 2009-12-10

Abstract

The utility model provides a center shaft speed increaser for bicycles, which is composed of a center shaft, a casing, a driving gear, a driven gear, a keyboard gear, a driven gear shaft, a bearing and a keyboard. The utility model is characterized in that the driving gear is fixed on the center shaft; the keyboard gear and the keyboard are made into a whole which is fixed to a main shaft through the bearing; the whole speed increaser is arranged outside a shaft sleeve of a bicycle. The utility model does not change the structure size of an original bicycle, and the speed increaser is arranged outside a center shaft of a bicycle. The utility model has the advantages of small size and simple structure, and is a practical speed increaser for bicycles. Besides, parts of the speed increaser can not be damaged easily.

Description

The bicycle middle shaft speed increaser

The utility model belongs to the bicycle speed-regulating field, specifically is a kind of bicycle middle shaft speed increaser.

The boost installation of existing bicycle has various ways, has plenty of and adopts the number of teeth that increases the axis chain drum; The number of teeth of the minimizing rear axle chain drum that has, because the structure space of bicycle is limited, this increase or minimizing also are limited; What have increases speed increasing mechanism in axis, this mode makes the axis increase in volume, and, this mode drive disk assembly complexity, its cost is also than higher, and therefore, seldom producer is engaged in and produces these bicycles, and seen speeding-up bike is also just seldom on the market.

The purpose of this utility model is to provide a kind of and does not change former bicycle middle shaft scantling of structure, and little, simple in structure, the economical and practical bicycle middle shaft speed increaser of volume.

The purpose of this utility model is to realize like this, it is made up of axis, shell, driving gear, driven gear, chain drum gear, driven gear shaft, bearing, chain drum, its feature is: driving gear is fixed on the axis, chain drum by bearing fixing on axis, driven gear is installed on the driven gear shaft and constitutes the gear type speed increaser with driving gear, chain drum gear, and whole speed increaser is contained in the outside of bottom bracket axle.

Concrete structure of the present utility model also has: chain drum gear and chain drum are made one.

Concrete structure of the present utility model also has: two driven gears are separately fixed on the driven shaft, and driving wheel meshes with a flower wheel, another flower wheel and chain drum gear mesh, driven gear shaft by bearing fixing on shell.

The utility model does not change the scantling of structure of former bicycle because chain drum and speed increaser are combined into one, and speed increaser is contained in the outside of bicycle middle shaft, its advantage is that volume is little, simple in structure, parts are not fragile during use, and the speedup effect is obvious, are a kind of practical bicycle speed increasers.

Below in conjunction with accompanying drawing the utility model is done and to be specified:

Accompanying drawing is a structural representation of the present utility model;

As shown in the figure: the utility model is made up of axis 1, shell 2, driving gear 3, driven gear 4,5, chain drum gear 6, driven gear shaft 11, bearing 8,9, chain drum 7, its feature is: driving gear 3 is fixed on the axis 1, chain drum 7 is fixed on the axis 1 by bearing 8, driven gear 4,5 and driving gear 3, chain drum gear 6 constitute the gear type speed increaser, and whole speed increaser is installed in the outside of bicycle middle shaft cover 10.

Chain drum gear 6 of the present utility model is made one with chain drum 7.

Driven gear 4,5 of the present utility model is fixed on the driven shaft 11, driving wheel 3 and flower wheel 4 engagements, and flower wheel 5 and 6 engagements of chain drum gear, driven gear shaft 11 is fixed on the shell 2 by bearing 9.

The number of teeth of driving gear 3 and driven gear 4,5, chain drum gear 6 can be made different the change as required, to form different speedup ratio.

The utility model can be installed on the axis of three-wheel vehicle.

Claims

1. bicycle middle shaft speed increaser, be by axis (1), shell (2), driving gear (3), driven gear (4), (5), chain drum gear (6), driven gear shaft (11), bearing (8), (9), chain drum (7) is formed, it is characterized in that: driving gear (3) is fixed on the axis (1), chain drum (7) is fixed on the main shaft (1) by bearing (8), driven gear (4), (5) being separately fixed at driven gear shaft (11) goes up and driving gear 3, chain drum gear (6) constitutes the gear type speed increaser, and whole speed increaser is installed in the outside of bicycle middle shaft cover (10).

2. a kind of bicycle middle shaft speed increaser according to claim 1 is characterized in that: chain drum gear (6) is made one with chain drum (7).

3. a kind of bicycle middle shaft speed increaser according to claim 1, it is characterized in that: driven gear (4), (5) are fixed on the driven shaft (11), driving wheel (3) and flower wheel (4) engagement, flower wheel (5) and chain drum gear (6) engagement, driven gear shaft (11) is fixed on the shell (2) by bearing (9).