JP2788415B2 - Bicycle drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle drive and a multi-speed transmission.

[0002]

2. Description of the Related Art In driving a bicycle, a pedal is depressed by a leg to rotate a crankshaft, and a wheel is driven via a chain by a sprocket attached to the crankshaft. For this reason, a large pedaling force is required on an ascending slope, but in a person with weak leg strength or a mini cycle with a small wheel diameter, the slope that can be climbed is limited. It is difficult to get a feeling speed.

Therefore, in order to increase the torque when climbing a hill and increase the speed on a flat ground, those having a transmission mechanism of about 3 to 7 speeds are often used in practical terms. In order to enjoy the change from a high speed to a high speed, a device having a further multi-stage transmission is used. Thus, such a multi-speed transmission has a plurality of sprockets having different numbers of teeth superimposed on one or both of a rear wheel drive shaft and a crankshaft rotated by a pedal, and the sprockets are mutually operated by operating a wire. Exterior transmission for changing chains (Japanese Patent Laid-Open No. 63-2278)
4) and a transmission incorporating a planetary gear in the crankshaft (Japanese Patent Publication No. 1-59954, Japanese Patent Application Laid-Open No. 5-23846).
No. 8) has been proposed.

[0004]

As described above, a bicycle without a transmission, particularly a bicycle with a low position of a crank hanger such as a mini cycle, has a short pedal arm,
A large torque could not be obtained by the pedaling force.
Further, even in a bicycle equipped with a transmission, if the number of sprockets is increased, the number of sprockets is reduced because the sprockets are stacked at intervals corresponding to the width of the chain.
When the number of sprockets becomes seven or more, not only does the amount of protrusion to the side increase, but also the difference between the maximum and minimum diameters of the sprockets increases, which makes it difficult to handle the slack amount of the chain.
Since the chain is hung in an oblique direction according to the stacking thickness, there is a problem in that the chain is liable to come off and easily come off. In the case of using planetary gears, the gear part becomes large,
There are drawbacks such as a complicated planetary mechanism, limited selection of the gear ratio, and difficulty in designing.

According to the present invention, a housing to be fitted to a crank hanger is provided, and a crank shaft penetrating the housing is made higher than the center of the crank hanger so that the pedal arm can be lengthened as necessary, thereby increasing torque due to pedaling force. In addition, by providing a speed change transmission device that selects a speed ratio by using a plurality of spur gears and a one-way clutch together with the crankshaft in the housing, a free speed ratio can be multi-staged without increasing the protruding portion. It is intended to be provided.

[0006]

Means for Solving the Problems] Therefore, the present invention is provided with a housing to be fitted to the crank hanger, to penetrate the crankshaft from the center of the housing at a position shifted to the upper, the crank shaft within the housing equipped with linked gear, an output rotary shaft which is mounted a gear meshing with the gear, Haujin outside of the housing to said output rotary shaft
Ligated sprocket in the grayed center position, and the <br/> to provided with the length of the pedal arm in accordance with the height of the clan <br/> click axis.

[0007]

[Action] Thus, it is possible to a high position of the crank shaft with respect to the center of Howe <br/> Jin grayed to be fitted to the crank hanger, by exchanging the pedal arm as much long, the torque due to pedaling force Can be bigger. Further, a transmission including a one-way clutch and a selection gear is housed in the housing together with the crankshaft, so that the transmission can be shifted in multiple steps within the housing, and the amount of protrusion to the side of the vehicle body is reduced. The number of gears is increased several times in accordance with the number of one-way clutches without increasing the number of sprockets.

[0008]

This will be described with reference to an embodiment shown in FIGS. 1 is a housing, 2 is a crank hanger for fitting the housing 1, a main pipe 3, a standing pipe 4, and a chain stay 5 are fixed to the outer peripheral surface by welding or the like, and a crankshaft 6 having a position above the center of the housing 1 penetrated. Pedal arms 7 are attached to both ends of the pedal arm. Reference numeral 8 denotes an output rotary shaft provided in the housing in parallel with the crankshaft 6, 9 denotes a crank gear mounted on the crankshaft 6 in the housing 1, 10 denotes a transmission gear mounted on the output rotary shaft 9 via an idle gear 11. With the crank gear 9. Reference numeral 14 denotes a connection gear attached to one shaft end of the output rotary shaft 8 protruding from the housing 1, and a cover 17 screwed and held to a plurality of mounting seats 16 is provided on an outer surface 15 of the housing 1. The sprocket 12 meshes with the internal teeth 20 of the internal gear wheel 19 supported at the center of the housing 1 via a bearing 18 between the outer side surface 15 and the cover 17.

[0009] rotating the crank shaft 6 with the pedal arm 7 rotates the transfer gear 10 via the idle gear 11 with the crank gear 9 fixed to the crank shaft 6 to rotate the output rotating shaft 8, the connecting gear 14 is The sprocket 12 is driven to rotate via the internal gear wheel 19 .

As described above, the crankshaft 6 is provided at a position higher than the center of the crank hanger 2 and the crank gear 9 is provided.
And the gear ratio of the internal gear wheel 19 is 1 , the pedal arm 7
And the torque due to the pedaling force can be increased. In this structure, since the crankshaft 6 can be disposed inside the sprocket 12, the diameter of the sprocket can be increased, the interval between the crankshaft 6 and the output rotary shaft 8 can be reduced, and the diameter of the housing 1 can be reduced. it can.

Next, an embodiment shown in FIGS . 3 to 6 will be described. 1 is a housing, 2 is a crank hanger for fitting the housing 1, and a main pipe 3, a standing pipe 4, and a chain stay 5 are fixed to the outer peripheral surface by welding or the like, and both ends of a crankshaft 6 having the housing 1 penetrated through the upper part. The pedal arm 7 is attached. Reference numeral 8 denotes an output rotary shaft provided in the housing in parallel with the crankshaft 6, 9 denotes a crank gear mounted on the crankshaft 6 in the housing 1, and 10 denotes a transmission gear mounted on the output rotary shaft 9.

Reference numeral 21 denotes a support shaft provided in the housing 1 in parallel with the crankshaft 6, which is a fixed shaft in the embodiment, but may be a rotary shaft. A clutch support 23 rotatably supported around the support shaft 21 by the support shaft 21 and the receiving piece 22 is provided.
And a drive gear 24 that meshes with the crank gear 9 attached to the motor. Numeral 25 denotes a plurality of one-way clutches provided in parallel with each other in the axial direction of the clutch support 23 .
As shown in the figure, four 25s, 25a, 25b and 25c are provided. Reference numeral 26 denotes a slider which slides along the support shaft 21 by operating the operation wire 27 to select and operate the one-way clutch. Reference numeral 28 denotes an operation spring of the slider 26.
Reference numeral 9 denotes a selection gear which is rotatably fitted to the outer periphery of each one-way clutch with a small gap g ( FIG. 4 ) and has a different number of teeth . In FIG.
a, 29b and 29c.

As shown in FIG. 4 , the one-way clutch 25 is provided with a small-diameter opening in an annular clutch frame 251 surrounding a slider 26 that slides on the support shaft 21 so that a roller or a ball can be used. In the figure, four vertical grooves 253 are provided in the drawing to prevent the operation trochanter 252 from falling off, and a horizontal groove 254 opening on the outer peripheral surface of the clutch frame is provided at right angles to each vertical groove. , A sliding piece 255 sliding along the lateral groove, a pushing piece 256 provided at the tip of the sliding piece, an operating rotator 257 made of a roller or a ball, and a return spring 258 surrounding the pushing piece 256 are housed. The operation trochanter 252 is connected to the inclined surface 25 of the sliding piece 255.
9.

Therefore, when the operation trochanter 252 is pushed up by sliding of the slider 26, the operation trochanter 252 pushes the inclined surface 259 of the operation trochanter and the sliding piece 255 is moved to the lateral groove 25.
4, and the working trochanter 257 is moved in FIG.
As shown in the upper half of the drawing, the outer peripheral surface of the clutch frame 251 is pushed out and pressed against the selection gear 29 provided on the outer periphery of the clutch frame 251 with a small gap g, and the selection gear 2 is pressed by the wedge action.
9 and the clutch frame 251 are connected. Reference numeral 260 denotes a connecting rod for connecting and holding the one-way clutch to the clutch support 23.

A transmission gear 31 having teeth meshing with the respective selection gears 29 is fixed to the output rotation shaft 8 provided in parallel with the support shaft 21. In FIG . 6 , 31s, 31a, It has four teeth 31b and 31c. The transmission gears each have a different gear fixed to the output rotary shaft 8, but may be a single gear having four teeth.

A connecting gear 14 is attached to an end of the output rotary shaft 8 protruding from one outer surface 15 of the housing 1, and is screwed and held by a plurality of mounting seats 16 provided on the outer surface 15. A cover 17 is provided, and the crankshaft 6 and the coupling gear 1 are provided outside one outer surface 15 of the housing 1.
4, the internal gear 19 is rotatably supported via a bearing 18, the connecting gear 14 is engaged with the internal teeth 20 of the internal gear 19, and the sprocket 12 is provided outside the internal gear 19. I have. Reference numeral 13 denotes a set screw for fixing the housing 1 fitted to the crank hanger 2.

Next, the operation will be described. When the crankshaft 6 is rotated by the pedal arm 7, the clutch support 23 is rotated by the drive gear 24 from the crank gear 9 fixed to the crank shaft 6. The slider 26 has an operation wire 27
, The operation rotator 252 of the one-way clutch 25 s is pushed up (upper half of FIG. 4 ), and the other one-way clutch 25
a, 25b, and 25c of the operation trocar 252
1 (in the lower half of FIG. 4 ). Therefore, the sliding piece 255 of the one-way clutch 25s
Is pushed out by the inclined surface 259, and the operating rotator 257 presses against the inner surface of the selection gear 29s to perform a wedge action, and the sliding pieces 25 of the other one-way clutches 25a, 25b, 25c.
5 is pushed in by the return spring 258, and the working trochanter 257 is in a free state.

Accordingly, in this state, as described above, the clutch frame 251 integrally connected to the clutch support 23 via the crankshaft 6 and the drive gear 24 by the crankshaft 6 moves in the direction of the arrow in FIG. When rotated, the operating rotator 257 of the one-way clutch 25s is sandwiched between the clutch frame 251 and the inner peripheral surface of the selection gear 29s to connect the two, and the output rotation is performed by the gear ratio of the selection gear 29s and the transmission gear 31s. The shaft 8 is rotated in the same direction as the crankshaft 6. At this time, the other one-way clutches 25a, 25b, 25c
Since the operating rotator 257 is in a free state, the selection gears 29a, 29b, and 29c idle around the outer periphery of the clutch frame 251. The rotation of the output rotation shaft 8 causes the connection gear 14
Rotates the internal wheel 19 through the internal teeth 20, and the sprocket 12 rotates to rotate the rear wheel by the chain.

When the operating wire 27 is loosened by the shift lever or the grip and the slider 26 is moved from the one-way clutch 25s to 25a by the operating spring 28, the operating rotator 252 of the one-way clutch 25a is pushed in and the sliding piece 2 is moved.
55, the operation rotator 257 connects the selection gear 29a and the clutch frame 251 to rotate the output rotary shaft 8 at a low speed at the gear ratio between the selection gear 29a and the transmission gear 31a.
Further, when the operation wire 27 is pulled and the slider 26 is operated toward the one-way clutch 25b, the one-way clutch 25b and the selection gear 29b are connected, and the output rotary shaft 8 is moved at the gear ratio between the selection gear 29b and the transmission gear 31b. Rotate at high speed.

Therefore, as shown in FIG. 5 , when two internal sprockets 12 are provided on the outer peripheral surface of the internal gear wheel 19 and the rear wheels are provided with three-stage sprockets, the conventional gear shifting requires only six sprockets. In the case of a stepped shift, a shift of 24 steps corresponding to four times the shift between the sprockets can be performed according to the number of one-way clutches 25 provided in the housing.

In the embodiment shown in the drawing, for the sake of simplicity, four one-way clutches 25 are provided, and four selection gears 29 and transmission gears 31 are also provided in accordance with the four one-way clutches 25, so that four clutches are provided in the housing. I'm trying to shift in stages,
The one-way clutch only needs to be thick enough to provide the vertical groove and the horizontal groove for accommodating the rotator and the sliding piece, and can be formed thin, so that the width of the housing constituting the frame remains the same as before. Thus, more one-way clutches can be overlapped to increase the number of shift stages, and by arranging seven sets in parallel, a shift speed of 42 stages can be achieved in the above case.

In the illustrated embodiment, the crankshaft 6
A separate support shaft 21 is provided to rotate the clutch support 23 via the crank gear 9 and the drive gear 24. However, the clutch support 23 may be fixed directly to the crank shaft 6. In the case, the selection gear 29 and the transmission gear 3
1 or between the connecting gear 14 and the internal teeth 20, an idle gear for changing the rotation direction may be inserted, and the rotation directions of the crankshaft and the sprocket may be made the same.

The housing 1 according to the present invention comprises:
As in the embodiment of FIG. 5 , the housing 1 constructed separately from the crank hanger 2 and assembled with the one-way clutch and each gear is fitted to the crank hanger 2 and fixed at a predetermined angular position with a set screw 13 or the like. You may let
Alternatively, a main pipe, an upright pipe, and a chain stay may be attached to the outer periphery of the crank hanger so as to be used integrally with the crank hanger.

[0024]

The present invention according to the present invention, as described above, a housing fitted to the crank hanger, center of the housing
Ri is passed through the crankshaft above the position, the gear connected to the crankshaft in the housing, includes an output rotary shaft which is mounted a gear meshing with the gear, said output rotary shaft is protruded to the outside of the housing Housing center position
Concatenates the sprockets provided on the location, since there is provided a long pedal arm according to the height of the crank shaft, to increase the torque by depressing force, to reduce the travel of the bicycle, an increase in the increase and speed climbing force There is an effect that can be obtained. Further, by selecting the gear ratio between the gears in the housing and increasing or decreasing the rotation speed of the sprocket with respect to the rotation speed of the pedal, the torque due to the pedaling force can be increased or the speed can be increased.

Further, in a housing to penetrate the crankshaft, and connected to a crank shaft incorporating a transmission apparatus that performs transmission by switching a gear in a plurality of stages, of the housing and the output rotary shaft outside of the housing By connecting to the sprocket provided at the center, the amount of protrusion to the outside of the vehicle body is small even if the number of gears is increased, and it is possible to perform multiple gears by combining gears, and the position of the sprocket During ~
Because it is in the heart, it is well formatted, making production easy,
The transmission can be built in only by making the housing part larger than the conventional one, and the effect that the protrusion from the vehicle body is small and the appearance of the crank hanger part is large and unique can be obtained.

Also, the housing is separated from the hanger of the vehicle body, and necessary gears and clutches are incorporated into the housing together with the crankshaft, and the housing is fitted and fixed to the hanger, thereby facilitating assembly and maintenance. It can be replaced with a different transmission.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention, and shows a cross section taken along a line BB of FIG. 2;

FIG. 2 is a central sectional view of FIG.

FIG. 3 is a sectional view of a main part showing another embodiment, showing the inside of the housing, a part outside the housing, and a part outside the cover.

FIG. 4 is a side view showing the structure of the one-way clutch.

FIG. 5 is a sectional view taken along line CC of FIG. 3;

FIG. 6 is a partially enlarged view of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Housing 2 Crank hanger 3 Main pipe 4 Standing pipe 5 Chain stay 6 Crank shaft 7 Pedal arm 8 Output rotating shaft 9 Crank gear 10 Transmission gear 11 Idle gear 12 Sprocket 13 Set screw 14 Connection gear 15 Outer side surface 16 Mounting seat 17 Cover 18 Bearing 19 Internal gear wheel 20 Internal gear 21 Support shaft 22 Receiver 23 Clutch support 24 Drive gear 25, 25s, 25a, 25b, 25c One-way clutch 251 Clutch frame 252 Operation trochanter 253 Vertical groove 254 Horizontal groove 255 Sliding piece 256 Push piece 257 Actuator 258 Return spring 259 Inclined surface 260 Connecting rod 26 Slider 27 Operation wire 28 Operation spring 29, 29s, 29a, 29b, 29c Selection gear 31, 31s, 31a, 31b, 31c Transmission gear

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-54-102454 (JP, A) JP-A-63-74789 (JP, A) JP-A-49-127343 (JP, A) JP-A 52-1024 66150 (JP, A) JP-A-53-86962 (JP, A) JP-A-50-59948 (JP, A) JP-A-57-17892 (JP, U) JP-A 16-16806 (JP, Y1) 14-2361 (JP, Y1) 37-6581 (JP, Y1) 37-9719 (JP, Y1) 13-13129, JP (Y1) 14578 (Taisho 14) (JP, Y 1T) Jongyo 10110 (Taisho 12) (JP, Y 1T) JP-B 33-8716 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B62M 11/06 B62M 9/04 F16H 3/10

Claims (1)

(57) [Claims] 1. A housing fitted to a crank hanger, a gear connected to a crankshaft in the housing, and an output rotary shaft having a gear meshing with the gear mounted on the housing. The sprocket, which is located in the upper position and penetrates the housing and is connected to the output rotation shaft, is the same as the housing outside the housing.
A bicycle drive device provided at an axis position .