CN2167038Y

CN2167038Y - Speed changing device built in rear axle

Info

Publication number: CN2167038Y
Application number: CN 93222673
Authority: CN
Inventors: 计福康
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-21
Filing date: 1993-08-21
Publication date: 1994-06-01
Anticipated expiration: 2003-08-21

Abstract

Disclosed is a speed changing device built in rear axle, comprising the drive mechanism of a gear planet, an overrunning clutch mechanism, a speed regulation mechanism, an outer shell, a chain wheel and an operation device. The clutch mechanism is composed of an outer ratchet ring and an inner ratchet ring which are concavely and convexly engaged with an inner gear ring and the planetary gear frame and which and the drive mechanism of the planet gear are symmetrically arranged at the both sides of a planetary gear mechanism, and a long and a short pawls which are engaged with the inner and the outer ratchet rings and which are arranged on a left and a right ratchet seats; the speed regulation mechanism controls the opening and closing of a left and a right long pawls making use of regulating the position of a speed regulation sleeve at the rear shaft to finish three drive methods. The utility model has the advantages of compact structure, small size and convenient speed regulation, and solves the problems that the existing inner speed changing device with big volume, difficulty in speed regulation and easy idle shift.

Description

Speed changing device built in rear axle

The utility model relates to a kind of bicycle speed-varying unit, especially a kind of internal speed variator for cycle rear axle.

Bicycle speed-varying unit is broadly divided into internal speed changer and outer change-speed box two big classes: outer speed change adopts the multi-chain gear wheel transmission more, and it is big to take up room, out of supply during speed change, and the unenclosed construction of its chain, sprocket wheel is easy to wear, and pollutes vehicle and bicyclist's clothing easily; Internal speed changer, especially speed gear mounted in rear hub, it is little to take up room, and its chain gearing can be installed in the sealed chain box, weares and teares, pollutes little; Known to the contriver, at present internal speed variator for cycle rear axle adopts planetary gear mechanism more and is equipped with various clutch speed-changing mechanism and forms, as with supporting " white elephant board " speed gear mounted in rear hub of Shanghai phoenix bicycle, its clutch speed-changing mechanism adopts and moves back and forth castellated structure, the speed change difficulty can not speed change when quiescence and high-speed cruising, and be easy to generate the neutral gear phenomenon during speed change, tooth breaks easily, and overall volume is also bigger; A kind of " bicycle speed-varying unit of band anti-joyride device " disclosed in Chinese patent application number " 91232265.9 ", its speed-changing mechanism also adopts planetary gear mechanism, clutch speed-changing mechanism realizes two kinds of speed changes by the folding of outer ratchet on control ratchet and the planetary wheel, its weak point is that ratchet, ratchet expose, volume is bigger, and can only realize the variation of two kinds of speed ratios.

The purpose of this utility model is to provide that a kind of volume is little, in light weight, totally-enclosed, safe in operation, speed change are convenient, can not produce the internal speed variator for cycle rear axle of neutral gear during speed change.

The purpose of this utility model can realize by following measure: by the gear epicyclic transmission mechanism, overrunning clutch mechanism, regulating mechanism, effector and shell, the internal speed variator for cycle rear axle that sprocket wheel is formed, the gear epicyclic transmission mechanism is by the sun gear that is fixed on the rear axle rod, and the planetary wheel and the inner gear that are installed on the tooth rest constitute; Overrunning clutch mechanism by symmetry be installed in gear epicyclic transmission mechanism both sides and planetary gear carrier concave-convex clutch interior ratchet ring and with the outer ratchet ring and the left side of inner gear concave-convex clutch, right ratchet seat constitutes, interior ratchet ring overlaps outside in the ratchet ring, long, short ratchet pawl, click spring is fixed in the sour jujube seat by detent pin, ratchet by click spring upspring the right ratchet seat short ratchet pawl with outside long ratchet of ratchet ring interlock and interior ratchet ring interlock, left ratchet seat short ratchet pawl and the long ratchet of interior ratchet ring interlock with outside the ratchet ring interlock, a left side, right ratchet seat passes through steel ball, axle shelves nut and rear axle rod combine as a whole, sprocket wheel is installed and by steel ball and housing contacts on the right ratchet seat, left ratchet seat be in the pressing mode admittedly extremely on shell, in the enclosure with the speed-changing mechanism encapsulation; Accent is stated mechanism by the speed governing cover that is installed on the rear axle rod, live and sell, intermediate bar, push rod, spring, the plug screw constitutes, there is radially slotted hole rear axle rod sun gear both sides, the pin of living sees through radially slotted hole and the speed governing cover is limited in the rear axle rod certain limit slides, between two pins alive intermediate bar is arranged in the rear axle rod hollow hole, pressure spring is encapsulated in rear axle rod one end by the plug screw, penetrate push rod at the rear axle rod other end, push rod is regulated the position of speed governing cover to control a left side, the folding of the long ratchet of right ratchet seat, make change-speed box in the full interlock of long ratchet, long ratchet one end interlock one end is decontroled and full the relieving under three kinds of states of long ratchet worked, and forms different drive connections.

The purpose of this utility model also can realize by following measure:

Two speed governing covers connect with the intermediate bar that is through in the rear axle rod by Xiao that lives in the speed governing actuating unit, intermediate bar one end and tension spring connect, the extension spring other end is fixed on rear axle rod one end, and the wire digging line and the intermediate bar other end that penetrate from the rear axle rod other end connect; Perhaps pressure spring is encapsulated in rear axle rod one end with the plug nut, wire digging line penetrates from plug nut hollow hole with intermediate bar and connects, effector control wire digging line, thus speed governing is finished in control speed governing cover position.

The utility model has following advantage compared to existing technology:

1, the utility model overall volume depends on planetary gear mechanism, and it has advantages such as volume is little, in light weight, bearing capacity is big, simple in structure, easily manufactured;

2, the symmetrical sectional construction of overrunning clutch mechanism, the most symmetric arrangement of part, vertebration, reduced fabrication, idle space is few;

3, shifted employing flush type ratchet with about inside and outside sour jujube circle symmetric arrangement, short ratchet pawl is in interlocking pattern all the time, the folding of the long ratchet of speed governing cover Sliding Control, finish speed governing, so speed governing is convenient, can produce during clutch and step on empty and the phenomenon of falling off, safe in operation.

4, no matter at a high speed, at a slow speed, all speed governing arbitrarily.

The utility model accompanying drawing drawing is described as follows:

Fig. 1 is the front view of internal speed variator for cycle rear axle

1-rear axle rod 2-plug screw 3-axle shelves nut 4-spring

5-speed governing cover 6-lives and sells 7-planetary gear carrier 8-planetary wheel

The outer ratchet ring of ratchet ring 12-in the 9-inner gear 10-compensating-gear shaft 11-

The long ratchet of 13-steel ball 14-left ratchet seat 15-pawl axis 16-

17-short ratchet pawl 18-click spring 19-right ratchet seat 20-intermediate bar

21-push rod 22-steel ball 23-shell 24-sprocket wheel

25-dog chart 26-cover of dust 27-nut

Fig. 2 is the A-A cross-sectional schematic among Fig. 1

Fig. 3 is the B-B cross-sectional schematic among Fig. 1

Fig. 4 is a kind of embodiment of speed governing actuating unit in the bicycle rear axle change-speed box

4 '-spring 20 '-intermediate bar 28-plug nut

The 29-wire digging line

Fig. 5 is an internal speed variator for cycle rear axle drive connection block scheme

Below in conjunction with accompanying drawing the utility model is further described:

As shown in Figure 1, 2, 3, internal speed variator for cycle rear axle, by gear epicyclic transmission mechanism (1,7,8,9,10), overrunning clutch mechanism (11,12,14,15,16,17,18,19), regulating mechanism (2,4,5,6,20,21), shell (23), sprocket wheel (24) and effector are formed; Be fixed on the rear axle rod (1) sun gear be installed in the NGW type gear epicyclic transmission mechanism (as shown in Figure 3) that planetary wheel (8) on the planetary gear carrier (7) and inner gear (9) constitute, it is little to have volume, bearing capacity is big, the efficient height, the work balance, simple in structure, advantage such as easily manufactured, can between 0.8～1.0, select at the utility model middle gear modulus, the planetary wheel number generally is advisable with 3～4, sun gear directly processes on rear axle rod (1) in the present embodiment, its number of teeth is determined to make rear axle rod (1) satisfy requirement of strength, and according to the definite planetary wheel (8) of bicycle speed of a motor vehicle requirement of QB68-95-73 standard code and the parameter of inner gear (9), so that each grade speed of a motor vehicle meets the demands.Non-engagement circumference in large internal gear (9) both sides and planetary gear carrier (7) both sides are processed with Baltimore groove, with engaging and disengaging gear (11,12,14,15,16,17,18,19) in, outer ratchet ring (11,12) the boss concave-convex clutch on the circumference, interior ratchet ring (11) overlaps outside in ratchet ring (12) inner ring surface, in, outer ratchet ring (11,12) flank of tooth is on the same face of cylinder, long, short ratchet pawl (16,17), click spring (18) is fixed on a left side by detent pin (15), right ratchet seat (14,19) in, with about inside and outside sour jujube circle symmetric arrangement (as shown in Figure 2), ratchet (16,17) upspring in right ratchet seat (19) short ratchet pawl (17) and outer long ratchet of ratchet ring (12) interlock (16) and interior ratchet ring (11) interlock by click spring (18), left ratchet seat (14) short ratchet pawl (17) and the long ratchet of interior ratchet ring (11) interlock (16) and outside ratchet ring (12) interlock, a left side, right ratchet seat (14,19) by steel ball (22), axle shelves nuts (3) combine as a whole with rear axle rod (1), and piece together tight by nut (3), at sour jujube seat (14,19) end is equipped with cover of dust (26), sprocket wheel (24) and the castellated interlock of right ratchet seat (19), and it is fixing by dog chart (25), right ratchet seat (19) contacts with shell (23) by steel ball (13), on shell (23), be fixed with the floral disc that spoke is installed, left ratchet seat (14) and shell (23), are encapsulated in a whole set of speed-changing mechanism in the shell (23) admittedly extremely on shell (23) in the pressing mode; Regulating mechanism (2,4,5,6,20,21) by the speed governing cover (5) that is installed on the rear axle rod (1), live and sell (6), intermediate bar (20), push rod (21), spring (4), plug screw (2) constitutes, there is radially slotted hole rear axle rod (1) sun gear both sides, the pin (6) of living sees through radially, and slotted hole is limited to slip in rear axle rod (1) certain limit with speed governing cover (5), between two pins alive (6) intermediate bar (20) is arranged in rear axle rod (1) hollow hole, spring (4) is encapsulated in rear axle rod (1) one end by plug screw (2), penetrate push rod (21) at rear axle rod (1) other end, push rod (21) is regulated the position of speed governing cover (5) to control a left side, the folding of right long ratchet (16), make change-speed box in the full interlock of long ratchet (15), long ratchet one end interlock one end is decontroled and full the relieving under three kinds of states of long ratchet worked, and forms different drive connections; The control of push rod (21) can realize by the L type leverage that is installed on the back fork of bicycle, pairwise orthogonal arm of force fulcrum tangles, wire digging line and L type the lever arm of force on one side connect, another side limit arm acts on the push rod (21), wire digging line is by being installed in bicycle handle bar effector control on hand, spring positioning device is arranged on effector, can set the third speed position of change-speed box.

As shown in Figure 4: regulating mechanism also can be implemented in the following manner, two speed governing covers (5) connect with the intermediate bar (20 ') that is through in the rear axle rod (1) by the pin (6) of living, spring (4) is encapsulated in rear axle rod (1) one end by plug screw (28), wire digging line (29) penetrates from plug nut (28) hollow hole, connect with intermediate bar (20 '), guiding principle silk drag-line (29) is by the effector control that is installed on the Handlebar of bicycle.

The utility model is controlled the folding of left and right long ratchet (16) by regulating the position of speed governing cover (5), and realization surmounts, clutch, forms three kinds of different drive connections, and its drive connection is seen drive connection block scheme shown in Figure 5.Speed governing cover (5) is when shown position as shown in Figure 1, and the full interlock of left and right sour jujube seat (14,19) long ratchets (16) is the transmissions of fast shelves; When speed governing cover (5) is in the interlock of the long ratchet of action radius midway location left ratchet seat (14) (16) the relieving long ratchet of right ratchet seat (19) (16) is middle-grade transmission; When being in full relieving of other end position left and right sour jujube seat (14,19) long ratchets (16), speed governing cover (5) is the transmission of slow shelves.

Claims

1, a kind of internal speed variator for cycle rear axle, by gear epicyclic transmission mechanism (1,7,8,9,10), overrunning clutch mechanism (11,12,14,15,16,17,18,19), regulating mechanism (2,4,5,6,20,21), shell (23), sprocket wheel (24) and effector are formed, and gear epicyclic transmission mechanism (1,7,8,9,10) is by the sun gear that is fixed on the rear axle rod (1), the planetary wheel (8) and the inner gear (9) that are installed on the planetary gear carrier (7) constitute, and it is characterized in that:

Described overrunning clutch mechanism (11,12,14,15,16,17,18,19) be to be installed in gear epicyclic transmission mechanism (1 by symmetry, 7,8,9,10) the interior ratchet ring (11) of both sides and planetary gear carrier (7) concave-convex clutch and with the outer ratchet ring (12) and the left side of inner gear (9) concave-convex clutch, right pawl base (14,19) constitute, interior ratchet ring (11) overlaps outside in the ratchet ring (12), long, short ratchet pawl (16,17), click spring (18) is fixed on sour jujube seat (14 by detent pin (15), 19) in, ratchet (16,17) upspring in right ratchet seat (19) short ratchet pawl (17) and outer long ratchet of ratchet ring (12) interlock (16) and interior ratchet ring (11) interlock by click spring (18), left ratchet seat (14) short ratchet pawl (17) and the long ratchet of interior ratchet ring (11) interlock (16) and outside ratchet ring (12) interlock, a left side, right ratchet seat (14,19) by steel ball (22), axle shelves nuts (3) combine as a whole with rear axle rod (1), right ratchet seat (19) is equipped with sprocket wheel (24) and contacts with shell (23) by steel ball (13), and left ratchet seat (14) is fastened on the shell (23);

Described regulating mechanism (2,4,5,6,20,21) by the speed governing cover (5) that is installed on the rear axle rod (1), live and sell (6), intermediate bar (20), push rod (21), spring (4), plug screw (2) constitutes, there is radially slotted hole rear axle rod (1) sun gear both sides, the pin (6) of living sees through radially, and slotted hole is limited to slip in rear axle rod (1) certain limit with speed governing cover (5), between two pins alive (6) intermediate bar (20) is arranged in rear axle rod (1) hollow hole, spring (4) is encapsulated in rear axle rod (1) one end by plug screw (2), penetrate push rod (21) at rear axle rod (1) other end, push rod (21) is regulated the folding of the position of speed governing cover (5) with long ratchet (16) about controlling, and finishes speed governing.

2, internal speed variator of bicycle according to claim 1, it is characterized in that: two speed governing covers (5) connect with the intermediate bar (20 ') that is through in the rear axle rod (1) by Xiao (6) that lives in the regulating mechanism, spring (4 ') is encapsulated in rear axle rod (1) one end by plug nut (28), effector guiding principle silk drag-line (29) penetrates from plug nut (28) hollow hole with intermediate bar (20 ') and connects, and effector control guiding principle silk drag-line (29) is finished speed governing.

3, internal speed variator of bicycle according to claim 2, it is characterized in that: intermediate bar (20 ') end and tension spring connect, the extension spring other end is fixed on rear axle rod (1) one end, the wire digging line (29) that penetrates from rear axle rod (1) other end connects with the intermediate bar other end, and effector control wire digging line (29) is finished speed governing.

4, according to claim 1,2 or 3 described internal speed variator of bicycle, it is characterized in that: sun gear directly processes on rear axle rod (1).