FR2656847A1 - Set of components to allow a bike to have two-wheel drive - Google Patents

Abstract

Device for allowing a bike to have two-wheel drive. The invention relates to a device (set of components mounted mechanically) to allow a bike to have two-wheel drive, mainly on unstable ground. It consists of a power take-off (crown wheel) (9) secured to the rear wheel (2), of at least one chain (10), of a universal joint (27), (28), of a chain (24) connecting the universal joint jaw (28) to the front crown wheel (9'). The device according to the invention is particularly intended for all-terrain bikes.

Description

SET OF PARTS TO ENABLE A BIKE TO HAVE BOTH WHEELS
MOTORS.

The motricity of bikes is traditionally and exclusively confined to the rear wheel. The use of bicycles is oriented in two directions, either road use or all-terrain use.

Specialized bikes appeared.

In all terrain use the lack of traction, mainly on loose ground, or on hills is enormously felt, especially since the use of the "dancer" style aggravates the phenomenon by kle mass transbent on the front, involved by this style of pedaling.

The device according to the invention overcomes this drawback.

In fact, it includes a PTO on the rear wheel (toothed crown secured to the rear hub.) Which transmits the movement of the gear ratio utitis6 synchronously via a chain, to a receiving pinion located under the steering column
(in its uv profile axis) The movement is transmitted thanks to a universal joint (cardan joint, constant velocity joint ...) to a driving pinion located above a freewheel toothed crown and integral with the front wheel hub, the connection being ensured by a chain.

According to a preferred embodiment, all the elements allowing the front wheel to also become driving, are mounted mechanically, that is to say without welding or transformation of the 6lements agreed.

At a minimum, only the front fork will be replaced, all the other elements being grafted directly onto the existing parts.

THE APPENDIX DRAWINGS ILLUSTRATE THE INVENTION:
Figure 1 shows in profi view, the bicycle according to the invnetion
FIG. 2 represents a detailed front view, under @@ It is in section in the front wheel steering axis in line.

Figure 3 shows a detailed view of the profile of the fixing system of the gimbal and detection box.

FIG. 4 represents a detail view from above under @@ of the cardan joint.

(A) is the steering axis.

(B) is the axis of the receiving jaw (27) of the cardan joint; it is secant and perpendicular to the axis (B) is orthogonal to the median ptan tongitudinat (C) of the vehicle.

(D) is the axis of the transmitting jaw (28) of the universal joint
It is perpendicular to the axis (A), it is coincident with the axis (B) when the bike is single-track 1 in a straight line).

The bicycle (1) shown in Figure 1 includes: A rear wheel
(2), retained from synchronous acon to your front bolt (3), a tette (4) a handlebar (5). The connection between the crown (9) and the hub of the rear wheel (2) is either fixed or disengageable. In the case of a fixed link, the velost constantly with two driving wheels, on the other hand in the case of a disengageable link, (commanded from the handlebars, pat exempt) by a clutch located in the axis of your rear wheel (2 ); the bicycle will be with one or two drive wheels at will without loss of mechanical efficiency when the use of two drive wheels is not necessary, especially since the front crown (9 ') is mounted with a free wheel, the chains (10) and (24 () are only mobile in the use of all-wheel drive.

The chain (10) connects the crown (9) to the receiving pinion (25), its guidance and tension are ensured by the internal roller (12) and the upper tensioner (13). A plate (11) will support the caster (12) and the tension arm (14) caster support (13)
A spring (15) will maintain adequate chain tension on the upper chain strand (10). This plate (11) will be kept on the central tube (6) of the frame at the desired height, thanks to a half-column. Rings of digger spreaders will be chosen to adjust the plate (11) and its half collar to the tube (6) this in order to have a good tightening as well as a pantait alignment of the rollers (12) and (13) with the chain ( 10).

On tea figures 2.3. and 4 we can see that
The receiving pinion (25) is secured to the receiving machine (27), for example by means of a screwdriver drive. A screw (29) keeps the pinion (25) in place.

A bearing (31) (needle bearing and its ring (32)) allow the jaw (27) to be marked in its support (16), the said support (16) is maintained at the desired height on the steering column ( 8) thanks to a fixing system (half-collar and rings of different spreaders) of the same type as that used for the plate (11)
The support plate (16) is maintained in a position such that the pinion (25) is in the same position as your crown (9), that is to say in a plane parallel to (C). This position guarantees proper functioning of the chain (I0) is obtained thanks to an articulated fixing, adaptable to any inclination of the tube (7) of the frame relative to the steering column (8). Indeed the link (I8) is tightly mounted on the plate (I6) and on the support (I7) after it has been positioned on the tube (7).

The collar (17) being of the same type (half-colian and rings of different thicknesses) as that used for the plates (II) and (I6).

The two tubes (7) and (8) form a plane coincident with the plane (C)
You can see that your support parts (II), (I6) and (I7) are adaptable to all bikes.

The jaw (27) transmits its rotational movement to an emitting coardan machine (28), this jaw (28) preferably turns in a bearing of the same type as that described previously (31).

(32). The same applies to the drive of the transmission pinion (26) which will preferably be identical to its counterpart (25).

The jaw bearing (28) will be housed in a bell housing (330 enclosing the pinion (26). Lights (30) located in the lower part of the housing (33) will allow the chain (24) to drive the ring gear (9 ') mounted on a freewheel relative to the front wheel (3).

The case (33) will be welded or machined with the stem (35) of the fork (20), or mechanically attached
On tigure 1, we see that:
The torch (20) can conventionally have 2 branches; in this case a connecting element (19), stiffened by plates (34) will be used.

At the lower end of the fork legs (20) will be arranged plates (27) in which longitudinal lights will allow the tension of the chain. Eccentrics (snails) (22) will adjust the tension of the ch pressing on pins (or head hexacave screw) (23)
If necessary, a device identical3 or similar to the dog clutch system for driving the crown (9) with the rear wheel, can be used for the crown (9 ') with the front wheel, this system can also be of the blocking type. wheel read before in order to have a complete transmission in all circumstances.

The fork (20) can also be a single-arm steering element in which, in a sealed manner, the chain (24) can be clamped. The freewheel ring causes the hub of the wheel (3) to be immaterial, but a spindle that is mobile in rotation and supports, thanks to a quick-fixing system, the wheel (3). In this case, a quick release device for the brake caliper will be used (pin, folding beta ...

pat exempt.)
A protective casing (not shown in the drawing) will protect the cyclist mainly in the pants going from the plate (II) to the plate (I6).

The parts (33) (I9) and (35) can constitute a single and same part coming from foundry for example (light alloy)
The tubes (20) and the steering stem can be attached by fitting or by clamp ...

The gear ratio between the rear and the front is such that, thanks to the freewheel secured to the front sprocket

(9 '); this civne becomes motive only when the back skates
(relative circumference of the wheels included)
In a preferential way the transmission ratio between the rear crown (9) and the receiving pinion (25) will be multiplied in order to decrease the torque transmitted to the universal joint, this in
Spinning it faster than the rear wheel.

Different variants depending on the technologies used (choice
materials or the degree of sophistication in the realization)
are possible without being new compared to
to the present invention. Similarly, the system described (mounting mé
is adaptable to any final solution (welding),
reported or original.

The devices according to the invention are particularly intended
mountain bikes.

Claims (8)

REVENVICATIONS 1) Set of parts to allow a road bike the two driving wheels characterized in that it comprises a toothed ring 99) fixable by means of rear wheel (2), and transmitting its movement synchronously to the front wheel (3) via a chain (at least) (10); a universal joint (27, 28) located under the steering column (8) and working in the steering axis (A); a chain (24) driving a toothed crown (9 ') integral with the front wheel (3) by a free wheel. The gear ratio is such that your front wheel does not move until the rear skates. 2) System according to claim 1 characterized in that a dog located in the rear wheel axis disconnects at will the drive of the crown (9) relative to the rear wheel (2); the clutch control is controlled from the handlebars (5) or nearby. If necessary an identical or similar device, or a wheel locking system

 free is mountable between the front wheel (3) and the crown (9 ')  3) System according to claim 1 or 2, characterized in  what a plate (11) mechanically fixed to the tube (6)  centrate of the door frame: in its lower part a wheel  lette (12) guiding the chain (10) and in its upper part  a tension arm (14), actuated by a spring (15) and  receiving a guide and movable caster (13) .Two half-rings  of adequate thickness ensure positioning and hand  your turntable (110 and its half-collar, some  or the diameter of the tube (6). 4) System according to claims 1 or 2 or 3 characterized in that  that the support (16) of the bearing (31, 32) of the jaw (27)  gimbal receiver is mechanically fixed to the column  direction (8) at the desired height. The perfect alignment of  pinion (250 with the rear crown (9) is obtained by the bie  hinge (18) articulated before tightening on the support plate (16)  and on the collar (17). Positioning and maintaining  (16) and (17) on tea tube4 (8) and (7) respectively is obtained  by the same device as that described in the claim  former. 5) System according to any one of the preceding claims  characterized in that the bearing (31, 32) of the transmitting jaw  (28) is housed in a bell housing (33) enclosing the pinion  transmitter (26). The chain (24) passing through the said box (33) by  lights (30). The gallows (35). the fork arms (20),  the connecting element (19) and the stiffeners (34) constitute  an integral and rigid assembly, monobloc or mechanically assembled. 6) System according to the preceding claim characterized in that the steering element (20) (330 is single-sided, the chain (24) working in this arm which constitutes a sealed casing. The transmission to the front wheel is made from the crown front (9 ') to the wheel (3) by means of a quick-fixing wheel spindle The front brake caliper is also mounted on a support ensuring rapid disassembly. 7) System according to any one of the preceding claims, characterized in that at the lower end of the fork arms (20) are arranged plates (21) whose longitudinal light in the direction of the chain tension (24) ensures , in connection with eccentric tensioners (snails) (22) and stops (23), the correct adjustment of the chain tension (24). 8) peton ta tevendication system 7 characterized in that the reduction ratio between the rear sprocket (9) and the receiver pinion (25) is a multiplier in order to make the gimbal (27, 28) turn faster than the rear wheel (2 )