JPS59205056A - Rotating mechanism - Google Patents

Abstract

PURPOSE:To aim at miniaturizing and making light-weight a rotary mechanism which is used as a drive mechanism for a bicycle or the like and has a pedal shaft as a drive shaft, and as well to obtain increased rotation, by utilizing a planetary gear mechanism and rotating a main sprocket in the direction opposite to the revolving direction of an auto-rotation shaft. CONSTITUTION:A main sprocket 15' and a gear 2 are fitted to a connecting shaft 8' which is rotatably supported to a pedal shaft 10 as a drive shaft by means of bearings, and a connecting shaft 8 which is integrally incorporated with an output wheel 9 and a gear 19, is rotatably supported to the shaft 10. Further, an auto-rotation shaft 3 which supports at its one end a gear 20 meshed with the gear 19 and which is rotatably supported by an arm rod 16 attached to the pedal shaft 10, carries at its the other end a driven sprocket 18 and a main sprocket 15' which are associated together by means of a chain 17. Further, the gear 21 is meshed with a gear 23 on a tumbling shaft 22 journalled to a support arm 24 fixed to a frame or the like, and a sprocket 29 provided at the other end of the tumbling shaft 22 and a sprocket 27 on the pedal shaft 10 are associated together by a chain 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotation mechanism that is further reduced in size and weight, and which can provide increased rotation speed.

Conventional rotating mechanisms that transmit rotational force by changing speed ratios have the problem that if they are formed so that the speed ratio can be set to a large value, the mechanism itself becomes large and heavy. For example, various types of bicycles, such as those with a fixed speed ratio or those with variable speed ratios, are manufactured, but the chain wheel on the drive side has many teeth and a large diameter. It becomes heavy. In addition, it is troublesome and expensive to manufacture, and it is difficult to increase the speed ratio on the drive side.

Therefore, the inventor of the present invention invented a rotating mechanism that is miniaturized using a planetary gear mechanism, and previously filed an application for the same.

This rotation mechanism will be explained with reference to FIGS. 1 and 2.
1 indicates a planetary gear, this planetary gear l meshes with a sun gear 2 fixed to the frame (9) via a mounting piece 31, and the planetary gear 1 rotates around the sun gear 2. It is fixed to one end of a rotating shaft 3 which is pivotally supported by an arm rod 4 so as to revolve around the arm.

The arm rod 4 rotatably supports the rotating shaft 3 at its distal end, and its base end is rotatably attached to the pedal shaft 10 to cause the rotating shaft 3 to rotate and revolve.

Bearings 4a and 4ai (bearings 4a and 4ai) are provided at the distal and proximal ends of the arm rod 4, respectively, so that the rotational axis 300 rotations and revolution can be made smoother.

Reference numeral 5 denotes a driving side sprocket that is fixed to the shaft in the longitudinal direction of the rotating shaft 3, and transmits the rotation of the planetary gear 1 to the driven side sprocket 7 that is fixed to the other end of the connecting shaft 8 via the chain 6. It is something to do.

The connecting shaft 8 is formed into a substantially cylindrical shape so as to be able to rotatably support the pedal shaft 10, and has an output wheel 9 (chain wheel) fixed to one end thereof. The driven sprocket 7 is located on the other side of the sun gear 2, and the output wheel 9 is located on one side of the sun gear 2.

A pedal crank 11 having a pedal 12 at the tip is fixed to the other end of the pedal shaft 10, and this pedal crank j]
A roller 13 is rotatably mounted at a predetermined position. This roller 13 has its 1ii1+ center as the rotation axis 3
The roller 13 is provided parallel to the axis of the roller 13.
The circumferential surface of the rotating shaft 3 is brought into contact with the circumferential surface of a disk 14 fixed at 1 tA at the other end of the rotating shaft 3, thereby pressing the disk 14 and causing the rotating shaft 3 to revolve.

Next, the operation of this power transmission mechanism (b) will be explained. 1) When the pedal crank 11 is rotated by putting the foot on the pedal 2, the disc 14 is revolved by the roller 13. and,
The planetary gear 1 revolves and is rotated by the sun gear 2, and the driving side sprocket 5 similarly revolves and rotates. In this way, the rotation of the tin rocket 5 is transmitted via the chain 6 to the driven sprocket 7, and the output wheel 9 also rotates together with the connection 1j% 118. Rotational force is transmitted to the rear wheels via 32.

The number of teeth on the gear and sprocket is 1. For example, the sun gear 2 has 36 teeth, the planetary gear 1°, and the driving side sprocket 5. If the driven sprockets 7 are each set to have 12 teeth, the output wheel 9 will rotate four times when the pedal crank 11 rotates once.

However, in the above-mentioned rotating frame structure, since the rollers 13 and the disc 14 are used for the revolution of the rotating shaft 3, the weight of the rotating mechanism increases accordingly, leading to an increase in the number of parts. Furthermore, since it is necessary to increase the number of teeth of the sun gear 2 in order to increase the speed ratio, the diameter of the sun gear 2 inevitably increases, resulting in an increase in space and weight.

Therefore, we have previously filed an application for a third rotating mechanism that is even more compact and lightweight, and that can provide increased rotation speed.

This rotation mechanism uses a main sprocket and a secondary tin rocket instead of the sun gear and planetary gear shown in Figure 2. In the figure, 15 is a main sprocket fixed to a frame etc. via a mounting piece 31. The main sprocket 15 has a hole 1.5a drilled in the center through which a pedal shaft 10 is inserted. Reference numeral 16 denotes an arm rod having one end fixed to the pedal shaft 10, and the other end of which rotatably supports the rotation shaft 3. This rotation shaft 3 is the main sprocket 1
A slave sprocket 18 is fixed to the main sprocket 15 and connected to the main sprocket 15 via a chain 17. The chain 17 has a wide roller width, and the main sprocket 1
5 and slave sprocket) 18 are engaged simultaneously with their sides facing each other. A sun gear 19 is fixed to the connecting shaft 8 that supports the output wheel 9, and this is meshed with a planetary gear fixed to the rotation shaft 3.

Next, the operation of the rotation mechanism will be described. First, the pedal shaft 10 is rotated by the rotation of the pedal crank 11, and the arm rod 16 is rotated. Then, the slave subblock (Z) 18 begins to rotate while revolving, causing the planetary gear Z) to rotate while revolving. In this way, the rotation of the planetary gear is the rotation of the sun gear 1.
9 to the output wheel 9;
The rotation is transmitted to the rear wheels via the chain 32.

Therefore, according to the above rotation mechanism, by using the main sprocket 15 and the slave sprocket 18 instead of the conventional sun gear and planetary gear, the rotation axis 3 can be positioned inside the pitch circle of the main sprocket 15. By increasing the diameter of the main sprocket 15, the ratio of the number of teeth to the slave sprocket 18 can be set larger.

In this rotation mechanism, since the main sprocket 15 is fixed, the number of rotations obtained by the subordinate sprocket 18 is the number of rotations obtained by the ratio of the number of teeth of the main tin rocket 15 and the number of teeth of the subordinate sprocket 18.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a rotation mechanism that can obtain faster rotation.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment, in which the same parts as in FIG. 3 are denoted by the same reference numerals.

The main sprocket 15' is rotatably supported via a bearing on a connecting shaft 8' supported by a pedal shaft 1O serving as a driving shaft, and is connected to a slave sprocket 18 via a chain 17. A gear 21 is supported on the connecting shaft 8', and this gear 21 meshes with a gear set supported on the rolling shaft n. The transfer 11!1II22 is rotatably supported via a bearing 6 on a support arm fixed to a frame or the like, and this support arm supports the pedal shaft 10 via a bearing at the tip thereof. . The rolling shaft a supports a gear at one end and a sprocket 29 fixed to the pedal shaft 10 at the other end.

Next, the operation of the rotation mechanism will be explained. pedal crank 1
When the -C pedal shaft lO rotates clockwise due to the rotation of the arm lever 16, the sprocket 27 rotates clockwise as the arm rod 16 rotates. The rotation of the sprocket L-27 rotates the C sprocket 4 clockwise through the chain path, and transmits the rotation at the number of rotations determined by the tooth number ratio of the tin rocket 27 and the sprocket 29 to the sprocket 4. Along with the rotation, the rolling shaft n rotates, causing the gear to rotate clockwise.Then, due to the rotation of the gear, the C gear rotates counterclockwise, and the gear rotates through the connecting shaft 8' to the main sprocket. ) 15' counterclockwise.This rotation of the main Sugerocket 15' is caused by the chain 17.
The rotation speed is transmitted through the slave sprocket 18r, and the slave sprocket 18 rotates counterclockwise at a rotational speed determined by the ratio of the number of teeth of both sprockets 15' and 18. On the other hand, the secondary tin rocket 18 is rotated clockwise by the arm rod 16 at a rotational speed corresponding to the rotation of the pedal shaft 10. Then, together with the slave sprocket 18, the planetary gear revolves while rotating,
The output wheel 9 is rotated clockwise via the sun gear 19, and the rear wheel is rotated via the chain 32.

Therefore, according to the above rotation mechanism, the secondary tin rocket 1
Since the main sprocket 15' is rotated in the direction opposite to the direction in which the main sprocket 8 revolves, more accelerated rotation can be obtained.

Further, by locating the secondary tin rocket 18 inside the pitch circle of the main sprocket 15', further miniaturization can be achieved.

Next, FIG. 5 is a conceptual diagram showing an embodiment in which an internal gear and a planetary gear are used in place of the main sprocket shown in FIG. 4.

In this case, the internal gear 33 is supported by the connecting shaft 8', and a planetary gear meshing with the internal gear 33 is fixed to the rotation shaft 3.

Therefore, since the internal gear 33 is rotated in the direction opposite to the direction in which the planetary gears revolve, it is possible to further increase the speed.

In addition, sprockets similar to the main sprocket 15' and the slave sprocket 18 of the first invention may be used instead of the sun gear 19 and the planetary gear in each of the above embodiments.
In addition to the internal gear and planetary gear of the second invention, similar gears may also be used.

Further, as a transmission means for rotating the main sprocket 15' or the internal gear in a direction opposite to the direction of revolution of the rotation shaft 3, a suitable combination of gears or sprockets can be used.

As described above, according to the rotation mechanism of the present invention, since the main sprocket or the main gear is rotated in the direction opposite to the direction of revolution of the rotation axis, it is possible to obtain rotation at a higher speed.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional rotation mechanism, Figure 1 is a partially cutaway perspective view, Figure 2 is a partially cutaway plan view, and Figure 3 shows an improved rotation mechanism. Conceptual cross section, 4th
The figure is a conceptual sectional view showing an embodiment of the rotation mechanism of the first invention, and FIG. 5 is a conceptual sectional view showing an embodiment of the rotation mechanism of the second invention. 3...Rotation axis, 8...Curved connection axis, 10
・・・・・・Petal axis, 15... Master tin rocket, 1
6... Arm rod, 17... Chain, 1
8...Slave sprocket, 19...Curved sun gear,
Addition, 22... Planetary gear, 21...
internal gear. Procedural amendment (voluntary) ゛ba: June 1980''=:'ri' 6th Director of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Application No. 78026 2, Rotation of the title of the invention Mechanism 3, person making the amendment'1Relationship with case F Patent applicant's address (1 other person) 4th attorney 〒107 Contents of amendment (1) Page 10 of the specification, line 3 [Gear 24-] 21".

Claims (2)

[Claims] (1) A main sprocket is rotatably supported on the driving shaft, and a slave rocket that is connected to the main sprocket via a chain and revolves while rotating is fixed to the rotating shaft, and this rotating shaft is supported by 1 qil. and a transmission means for transmitting the rotation of the rotation shaft to the upper shaft, and a transmission means for rotating the main sprocket in a direction opposite to the direction of revolution of the rotation shaft. Rotating mechanism. (2) ,,l: The above-mentioned rotational axis is supported on the supination side of the pitch circle of the main sprocket, and the main sprocket and the sub-sprocket are connected at a position where their side surfaces face each other. [1] The rotation mechanism according to item 1). A main gear is rotatably supported on a driving shaft, a planetary gear that meshes with this gear and revolves while rotating is fixed to an autorotation shaft, and means is provided for pivotally supporting and revolving this autorotation shaft, A transmission means for transmitting the rotation of the rotation shaft to an output wheel rotatably supported by the driving shaft is provided, and a transmission means for rotating the main gear in a direction opposite to the revolution direction of the rotation shaft. Rotating mechanism. The rotation mechanism according to claim 3, wherein an internal gear is used as the main gear.