JPH07117778A - Accelerator for bicycle - Google Patents

Abstract

PURPOSE:To reduce a crank side sprocket in diameter by making acceleration in the tooth number ratio of a sun gear to an internal gear and transmitting the acceleration to a hub to rotate it concentrically in the same direction with a sprocket of a rear wheel. CONSTITUTION:A ratchet ring 24 is fixed to an inner wall of a hub cylinder 21 of a rear wheel by screws 25 and 26. A sun gear 3 integrally formed with a claw wheel 15 having plural claws 31 and 32 to engage with the ratchet ring 24, is rotatably loaded by bearings 31 and 32 in a concentric form with a main shaft 1. An internal gear 4 to which a sprocket 18 is screw-fitted and which is integrally formed with a right side cover 5 freely rotatable with the hub external cylinder 21 by a bearing 30, is inserted/combined in a meshing shape in/with planetary gears 6 and 7. A gear cage is integrally constituted of six studs in order to hold a fixing stand 12 and a fixing ring 14 firmly in parallel with each other, and the planetary gears 6 and 7 and forward rotating gears 10 and 11 are installed in this by being attached to shafts 9 and 10 in parallel with each other. Thereby, acceleration in the tooth number ratio of the sun gear 3 to the internal gear 4 is transmitted to a hub as rotation in the same direction with input.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system for a bicycle.

[0002]

2. Description of the Related Art Conventionally, a derailleur system in which a plurality of large and small sprockets are combined in the front and rear, and a hub gear for three-speed shifting are used.

[0003]

[Problems to be Solved by the Invention]

(A) Published patent publication Hei 4 for ordinary bicycles for touring
When using the continuously variable transmission of No. -151055, it was necessary to set the crank side sprocket to a large diameter because of this mechanism. (B) In addition, in order to enable the wheel to roll a predetermined distance in comparison with the rotation of the crank pedal in a foldable bicycle where a small diameter wheel is indispensable, or in a mini cycle, the crank side sprocket is considerably larger than usual. It was necessary to reduce the diameter and make the rear wheel sprocket extremely small. However, the rear wheel sprocket has a limit that the number of teeth can be reduced because a freewheel incorporating a ratchet is incorporated, and if the number of teeth is excessively reduced, the mesh between the chain and the sprocket will be disengaged vertically, so-called chain. Tooth skipping phenomenon occurs. Therefore, the sprocket on the crank side inevitably has a large diameter,
Not only did it hinder pedal operation, but it was also a cause of obstacles in designing the lightweight structure and folding structure.

[0004]

A sun gear (3) integrated with a ratchet wheel (15) and a fixed base (12) and a fixed ring (14) fixed to a main shaft are mounted in a hub of a rear wheel. Multiple forward gears (10, 11) and planetary gears (6, 7)
Further, it is a speed increasing device in which an internal gear (4) integrated with a right side lid on which a sprocket is screwed is sequentially meshed and interlocked. (However, the sprocket side is "right" when facing the direction of travel of the bicycle.
The other side is called "left")

[0005]

As a result, the action of transmitting the speed increase of the gear ratio of the sun gear and the internal gear to the hub in the same direction as the sprocket of the rear wheel and in the same direction can be obtained.

[0006]

EXAMPLES Examples of the present invention will be described below. Figure 1
The ratchet ring (24) is in close contact with the inner wall of the hub outer cylinder (21) of the rear wheel as shown in FIG.
The ratchet pawls (22, 23) which are fastened and fixed by 6) and which are engaged with the ratchet pawls (15) integrated with the sun gear (3) are openably and closably mounted. Bearing (3) loaded by a cone (16) formed on the back surface of the stator (2) integrally formed with the main shaft (1) and a cup (17) press-fitted to one end of the sun gear.
The sun gear and the ratchet wheel are rotatably held by a bearing (32) loaded by a cup machined in the center of the ratchet wheel and a cone (20) screwed on the main shaft. ing. Also, the fixed base (12) and the fixed ring (14)
In order to firmly maintain the parallel to each other, as shown in FIG. 2, six studs (29, 30, 31, and 32, 33, 34) form an integral gear cage by crimping from both ends, and a planetary gear ( 6, 7) and the forward gears (10, 11) are axially mounted (8, 9) in parallel, respectively. This fixed base (1
2) is fitted to a stator (2) with a collar integrally formed with the main shaft as shown in FIG. 3, and is strongly fastened and fixed by a fastening nut (13) with a collar. Incidentally, this stator (2) is manufactured separately from the main shaft, and a female screw precisely matching the screw of the main shaft is provided in a through hole formed at the center of the stator, and the screw at the center of the main shaft is not cut. The main shaft and the stator are firmly fixed and integrated by strongly screwing up to the screw end point with the non-threaded portion (35), and the same state as in integral molding can be achieved, and the manufacturing cost can be greatly reduced. However, high precision of both screws is required. Further, the internal gear (4) is integrally provided with the right lid (5) to which the sprocket (18) of the rear wheel is screwed, and is provided in a tubular shape so as to mesh with the planetary gears (6, 7). A bearing (30) with a retainer is loaded by a cone formed around the shoulder portion of the right lid and a cup formed at the end of the hub outer cylinder, which is inserted and combined (however, the retainer is not shown). ) A bearing (29) is loaded by a cup formed in the center of the right side lid (5) and a cone (19) screwed on the main shaft, and these bearings allow the internal gear to rotate freely with the inner wall of the hub outer cylinder. The proper gap is maintained. Further, the left side lid (2
7) A cup at the center, and a cone (3
4) is screwed, bearings (33) are loaded between them, and the whole hub is suspended by this and the bearing (29) described above. In addition, these cones (19,
20 and 34) are optimally adjusted by the main shaft screw, and are then prevented from being loosened by a double nut, if necessary, as in the same type. Further, as shown in FIG. 1, the dustproof cover (28)
Is fitted to the right end of the hub outer cylinder.

The present invention has the above-described gear structure and is shown in FIG.
, The planetary gears (6, 7) meshing with the internal gear (4) are clockwise, the forward gears (10, 11) meshing with them are counterclockwise, and the sun gears meshing with these are further. (3) is rotated in the same clockwise direction as the internal gear. Therefore, the input rotation of the sprocket is always transmitted to the hub as the rotation in the same direction as the input through the ratchet to increase the gear ratio of the sun gear and the internal gear.

[0008]

According to the present invention, since the space in the rear wheel hub can be effectively utilized, the tooth width of each gear can be set to a sufficient dimension, wear can be prevented, and long-term durability can be maintained. Further, the selection of the speed increasing ratio can be easily selected depending on the number of teeth of the sun gear and the internal gear according to the diameter of the single wheel depending on the type of bicycle. In addition, even if the cause of failure due to the most severe dirt on the bicycle is stored in the hub, all that is necessary is to use an appropriate dust cap and the internal grease will not be contaminated. it can. Furthermore, in the case of a foldable bicycle that requires small wheels, the crank-side sprocket can be made significantly smaller in diameter than before, helping to reduce weight, and the folding mechanism can be designed more easily. is there.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the cross section taken along the line AA in FIG. 1 as seen in the direction of the arrow.

FIG. 3 is a perspective view showing a stator integrally formed with a main shaft.

[Sign clearing]

 (1) is the main shaft (2) is the stator (3) is the sun gear (4) is the internal gear (6, 7) is the planetary gear (10, 11) is the forward gear (15) is the ratchet (18) is Sprocket (22, 23) is claw (24) is ratchet ring

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[Procedure amendment]

[Submission date] October 18, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

EXAMPLES Examples of the present invention will be described below. Figure 1
The ratchet ring (24) is in close contact with the inner wall of the hub outer cylinder (21) of the rear wheel as shown in FIG.
The ratchet pawls (22, 23) which are fastened and fixed by 6) and which are engaged with the ratchet pawls (15) integrated with the sun gear (3) are openably and closably mounted. Bearing (3) loaded by a cone (16) formed on the back surface of the stator (2) integrally formed with the main shaft (1) and a cup (17) press-fitted to one end of the sun gear.
The sun gear and the ratchet wheel are rotatably held by a bearing (32) which is held by 1) and at the same time is loaded by a cup machined in the center of the ratchet wheel and a cone (20) screwed on the main shaft. ing. Also, the fixed base (12) and the fixed ring (14)
In order to firmly maintain the mutual parallelism, the six studs ( 36 , 37 , 38 , and 39 , 40 , 41 ) form the integral gear cage by crimping from both ends as shown in FIG. 6, 7) and the forward gears (10, 11) are axially mounted (8, 9) in parallel, respectively. This fixed base (1
2) is fitted to a stator (2) with a collar integrally formed with the main shaft as shown in FIG. 3, and is strongly fastened and fixed by a fastening nut (13) with a collar. Incidentally, this stator (2) is manufactured separately from the main shaft, and a female screw precisely matching the screw of the main shaft is provided in a through hole formed at the center of the stator, and the screw at the center of the main shaft is not cut. The main shaft and the stator are firmly fixed and integrated by strongly screwing up to the screw end point with the non-threaded portion (35), and the same state as in integral molding can be achieved, and the manufacturing cost can be greatly reduced. However, high precision of both screws is required. Further, the internal gear (4) is integrally provided with the right lid (5) to which the sprocket (18) of the rear wheel is screwed, and is provided in a tubular shape so as to mesh with the planetary gears (6, 7). A bearing (30) with a retainer is loaded by a cone formed around the shoulder portion of the right lid and a cup formed at the end of the hub outer cylinder, which is inserted and combined (however, the retainer is not shown). ) A bearing (29) is loaded by a cup formed in the center of the right side lid (5) and a cone (19) screwed on the main shaft, and these bearings allow the internal gear to rotate freely with the inner wall of the hub outer cylinder. The proper gap is maintained. Further, the left side lid (2
F) a cup in the center and a spindle (3
4) is screwed, bearings (33) are loaded between them, and the whole hub is suspended by this and the bearing (29) described above. In addition, these cones (19,
20 and 34) are optimally adjusted by the main shaft screw, and are then prevented from being loosened by a double nut, if necessary, as in the same type. Further, as shown in FIG. 1, the dustproof cover (28)
Is fitted to the right end of the hub outer cylinder.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Claims] 1. A hub (21) is fixed to an inner wall of an outer cylinder (21) (25,
26) A bearing (31, 32) concentric with the main shaft (1) of the sun gear (3) integrated with the ratchet wheel (15) provided with a plurality of pawls (22, 23) engaging with the ratchet ring (24).
Rotatably loaded with the sprocket (18) by screwing and the bearing (30) is integrally molded with the internal gear (4) and the main shaft, which is integral with the right lid (5) which is freely rotatable with the hub outer cylinder, or Secured to the stator (2) integrated with the spindle by screwing (1
3) a plurality of planetary gears (6, 6) that are axially attached to the fixed base (12) and the fixed ring (14) that is held in parallel and that mesh with the internal gear
7), a forward gear (10, 11), and a sun gear, which are successively meshed with the speed increasing device of the bicycle.