CN2293511Y

CN2293511Y - Crank telescoping power-saving device for bicycle

Info

Publication number: CN2293511Y
Application number: CN 97211700
Authority: CN
Inventors: 王聪
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-04
Filing date: 1997-03-04
Publication date: 1998-10-07
Anticipated expiration: 2007-03-04

Abstract

The utility model belongs to the classes of work and transportation and particularly relates to a crank telescopic power-saving device for a bicycle. Both ends of a hollow crank body are respectively connected with a front supporter and a rear supporter; the front supporter is connected with the rear supporter through a ball screw; the inner side of the ball screw is connected with a gear shaft through a key; the ball screw is pushed to rotate by the gear shaft through a fan gear shaft, a dual articulated gear and two groups of balls. In the running process of a bicycle, a pedal shaft is driven to rotate by a pedal and a cam is driven to rotate by the pedal shaft; therefore, that the crank can automatically extend in an apply work area and can automatically shorten out of the apply work area can be realized; the efficiency of manpower utilization can be effectively improved.

Description

The bicycle crank power-saving device that stretches

The utility model belongs to operation, transportation class, particularly relates to the telescopic power-saving device of a kind of bicycle crank.

China is a bicycle big country, and bicycle is the most frequently used vehicle in China, and existing bicycle crank is with a fixing length, manpower is converted into the needed moment of axis, the drive chain rotates, and provides power to bicycle, and bicycle is travelled.Crank is longer, and moment is big more, and is laborsaving more when riding, but the long problem that will produce two aspects of crank; In the time of on the one hand below pedal is in, very approaching with ground, very dangerous; On the other hand, crank whenever circles along in the axis rotary course, has only about 3/7ths to be that about 4/7ths is the idle travels that do not do work, so the lengthening of crank has just increased the motion amplitude of pin in the process of riding in acting.

The purpose of this utility model provides a kind ofly can extend in crank acting zone automatically, the telescoping crank of shortening automatically when idle travel, thus reach the purpose of joint power.

The technical solution of the utility model is as follows:

A kind of bicycle crank power-saving device that stretches, comprise pedal, crank, crank body one end that it is characterized in that hollow is connected with preceding supporting mass, and the other end is connected with the back supporting mass, and an endoporus is respectively arranged on forward and backward supporting mass, the helix raceway is arranged on endoporus, forward and backward supporting mass connects by ball-screw, and preceding supporting mass can slide in crank body, and an end of ball-screw has an endoporus, gear wheel shaft is installed in the endoporus by key, and gear wheel shaft can move axially in the hole; The garden finishing bevel gear cuter of gear wheel shaft front end be fixed on before garden finishing bevel gear cuter in the dual gear on the supporting mass be meshed, the garden stud wheel is meshing with each other with the elevating arc that is fixed on the preceding supporting mass, there are two raceways in outer garden at preceding supporting mass upper edge elevating arc, one group of ball is all arranged in every raceway, and an end of two groups of balls withstands on a side of elevating arc respectively; Be fixed with cam by axle sleeve I on the preceding supporting mass, pedal is fixed on the axle sleeve I; Be fixed with b oblique crank Z hoop on the pedal axle, an end of pedal is fixed with a plate, is connected with block tongue by interlinkage onboard; Axle sleeve I is fixed with cam and axle sleeve II on the outer garden, and axle sleeve I, II on preceding supporting mass, have ball and ball rack by ball bearing between preceding supporting mass and the crank body.

Advantage of the present utility model is that crank when moving in a circle, whenever rotates a circle, and crank just can extend in the acting zone automatically, shortens automatically in the zone of not doing work, and so just can reach laborsaving purpose in the bicycle running process.

The technical solution of the utility model is explanation in detail in conjunction with the accompanying drawings.

Accompanying drawing 1 is the utility model structural representation.

Accompanying drawing 2 is the utility model B-B cut-away view.

Accompanying drawing 3 is the utility model A-A cut-away view.

Accompanying drawing 4 is the utility model C-C cut-away view.

Accompanying drawing 5 is the utility model ball rack scheme drawing.

As shown in Figure 3, be supported with axle sleeve I19, II28 in the lower end of preceding supporting mass 17 by ball 30, be fixed with a cam 18 at the cylindrical middle part of axle sleeve I19, the other end is fixed with axle sleeve II28, in axle sleeve 119 endoporus pedal axle 27 is installed; Be installed with a b oblique crank Z hoop 26 on the pedal axle 27, it is fixing by screw 34, as shown in Figure 4, be fixed with a plate 32 at pedal 25 by crank one side, on plate 32, be connected with a block tongue 29, a recessed groove is arranged on the block tongue 29 by hinge 33, locating dowel pin 31 plays the role of positioning in groove.Bicycle is in the process of riding, pedal keeps and the ground level position basically, when in the acting zone, block tongue 29 contacts with b oblique crank Z hoop 27 juts and drives 27 rotations of pedal axle, pedal axle 27 is given cam 18 by axle sleeve I19 with transmission of power, as shown in Figure 1, cam 18 promotes to be installed in a group in two groups of balls 16 in the raceway 20, making it promote elevating arc 15 rotates, by dual gear 14, conical gear 13 on the gear wheel shaft 9 and the key 10 on the gear wheel shaft 9 are given ball-screw 4 with transmission of power, gear wheel shaft 9 is installed in the hole 8 of ball-screw 4 by key 10, and can move axially along the hole, with its supporting, its front end has a locating pad 12 with gear wheel shaft 9 location by ball and ball rack 5 at ball-screw 4 two ends.In the endoporus of forward and backward supporting mass 17,2, the helix raceway 11,3 that matches with ball-screw 4 is arranged, when ball-screw 9 rotates, because of back supporting mass 2 is to be fixed on the crank body 6, preceding supporting mass 17 is bearing in the crank body 6 by ball and ball rack 7, can move down elongation.When crank runs to when not doing work the zone, cam 18 just promotes another group ball 16, thereby drives elevating arc 15 contrarotations, drives ball-screws 4 contrarotations by dual gear 14, gear wheel shaft 9, key 10, thus upwards withdrawal of supporting mass 17 before making.When the crank counter motion, b oblique crank Z hoop 26 is with after block tongue 29 contacts, and block tongue 29 can pass through b oblique crank Z hoop 26 along the hinge left-hand revolution smoothly, because pedal axle 27 does not change, a supporting mass 17 does not promptly extend yet and do not shorten before the institute like this.One hole 1 is arranged on the back supporting mass 2, can axis is fixing within it.Pass through screw retention one cover plate 21 on the preceding supporting mass 17, and for the ease of assembling, preceding supporting mass 17 can be made two bodies, is combined by left side body 17 and the right body 22, quadrant gear 15 is fixed on the preceding supporting mass 17 by axle sleeve 23 and screw 24.What Fig. 5 represented is the structure of ball 35 and ball support 5 or 7.

Claims

1. the flexible power-saving device of a bicycle crank, comprise pedal, crank, crank body (6) one ends that it is characterized in that hollow are connected with preceding supporting mass (17), the other end is connected with back supporting mass (2), preceding, back supporting mass (17), one endoporus is respectively arranged (2), helix raceway (11) is arranged on endoporus, (3), before, back supporting mass (17), (2) connect by ball-screw (4), preceding supporting mass (17) can slide in crank body (6), one end of ball-screw (4) has an endoporus (8), gear wheel shaft (9) is installed in the endoporus (8) by key (10), and gear wheel shaft (9) can move axially in hole (8); The garden finishing bevel gear cuter (13) of gear wheel shaft (9) front end be fixed on preceding supporting mass (17) on dual gear (14) in the garden finishing bevel gear cuter be meshed, the garden stud wheel is meshing with each other with the elevating arc (15) that is fixed on the preceding supporting mass (17), in the outer garden of preceding supporting mass (17) upper edge elevating arc (15) two raceways (20) are arranged, one group of ball (16) is all arranged in every raceway (20), and an end of two groups of balls (16) withstands on a side of elevating arc (15) respectively; Preceding supporting mass (17) is gone up and is fixed with cam (18) by axle sleeve I (19), and pedal (25) is fixed on the axle sleeve I (19).

2. the bicycle crank according to claim 1 power-saving device that stretches is characterized in that being fixed with b oblique crank Z hoop (26) on the pedal axle (27), and an end of pedal (25) is fixed with a plate (32), goes up at plate (32) and is connected with block tongue (29) by hinge (33).

3. the bicycle crank according to claim 1 power-saving device that stretches, it is characterized in that being fixed with on the outer garden of axle sleeve I (19) cam (18) and axle sleeve II (28), axle sleeve I, II (19), (28) are bearing on the preceding supporting mass (17) by ball (30), and ball and ball rack (7) are arranged between preceding supporting mass (17) and the crank body (6).