JPS6024371Y2 - Braking device for pedal type rotating device - Google Patents

Description

[Detailed description of the invention] This invention is a pedal-type rotation device that reduces the braking torque at the dead center position of the crank and enables smooth rotation of the crank in a brake device for a pedal-type rotation device such as a beauty car. This invention relates to a braking device.

In general, pedal-type rotation devices are used, for example, in beauty cars.
It is constructed as shown in FIGS. 1 and 2.

That is, a saddle 2 for sitting is supported at the center of a pipe-shaped frame 1 that constitutes the framework of the beauty car, and a handle section 4 equipped with a speed display section 3 and the like is attached to the frame 1 in front of the saddle 2. Furthermore, a crankshaft 5 is rotatably supported in the left and right direction at the lower center of the frame 1, and at both ends of the crankshaft 5, the bases of two cranks 7, each having a pedal 6 pivotally supported at its tip, are mounted. Fixed.

A crank gear 8 is integrally provided on the crankshaft 5, and the rotation of the crankshaft 5 is transmitted to an eddy current braking device A supported by the frame 1 in front of the shaft 5 via the crank gear 8 and a chain. It is transmitted by

Further, as shown in FIG. 3, the braking device A is connected to a shaft 9 that is linked to a crank gear 8 via a chain.
A rotating body 12 consisting of a first disc 10 made of a magnetic material such as an iron plate and a second disc 11 made of a non-magnetic conductive material such as a copper plate is fixed together,
A magnetism generating body 14 fixed to a yoke 13 made of a magnetic material such as an iron plate is disposed on the second disk 11 side near the rotating body 12.

This magnetism generating body 14 consists of a pole 15 fixed to a yoke 13 and a bobbin 16 provided around the outer periphery of the pole 15 and having multiple windings wound thereon.By applying a DC voltage to the winding, the pole 15 is Generates a constant DC magnetic field.

Then, by stepping on the pedal 6, the crank 7 is rotated,
When the shaft 9 is rotated through the chain and a DC voltage is applied to the winding of the magnetic generator 14, the magnetic generator 14
The magnetic circuit is configured as shown by the dashed-dotted line arrow in the same figure, and the second disc 11 of the rotating body 12 cuts the lines of magnetic force, so that an eddy current is generated in the second disc 11, and the rotating body 12 A braking torque is generated by the product of the eddy current and the magnetic flux of the magnetic generator 14.

According to this braking device A, the braking torque can be adjusted by adjusting the excitation current, and the gradient of the road surface can be electrically simulated.
Since it is constructed from a disc 11, it is possible to obtain abundant magnetic flux and increase the braking torque.Therefore, the dose of the excitation winding can be reduced, the rotating body 12 can be downsized, and it can be made at low cost.
Since the configuration is simple, it does not require much labor or equipment in terms of manufacturing such as parts processing and assembly, and can be made at low cost.

Furthermore, since the magnetic circuit is provided only on one side with respect to the rotating body 12, the braking device A can be made thin, thereby making it possible to provide a thin beauty car, reducing the amount of packaging required, and reducing the cost.

However, according to the above-mentioned braking device A, since the human-powered drive unit has the crank 7 equipped with the pedal 6, when one crank 7 is located at the top dead center and the other crank 7 is located at the bottom dead center, , both cranks 7 cannot rotate smoothly, and the pedal 6
The pedaling force becomes weaker, and for every revolution of crank 7,
This has the disadvantage that it requires uneven pedaling force at several locations.

In order to ensure smooth rotation even at the dead center position of the crank 7, it is necessary to reduce the load, and one way to do this is to detect the position of the crank 7 and generate magnetism when the crank 7 passes the dead center. A method of restricting the energization to the windings of the body 14 is conceivable, but this method requires a detection circuit and a control circuit, and has the disadvantage of being expensive.

This idea was made with the above points in mind,
Next, this invention will be explained in detail with reference to the drawings from FIG. 4 showing an embodiment thereof.

First, Fig. 4 and Fig. 5 a and b showing one embodiment
I will explain about it.

In these drawings, 17 is a casing that forms the outside of the braking device, and a chain 1 is attached to a part of the crank gear 8 side.
An insertion hole 19 through which the screw 8 is inserted is transparently provided.

Reference numeral 20 denotes a shaft whose both ends are fixed to the frame 1 with nuts 21, and a stepped portion with a large diameter is formed approximately in the center of the shaft 20.

A first housing 22 is rotatably supported on the left side of the shaft 20 via a bearing 23, and a gear 24 is fixed to the left end of the first housing 22, and has 172 teeth of the crank gear 8. Along with chain 18
When the chain 18 is wound around the outer circumference of the gear 24, the rotation of the chain 18 is transmitted to the first housing 22.

25 is a first disc made up of two iron plates, 26 is a second disc made up of a copper plate, and both discs are 25°2.
6 are fixed together with rivets 27 to constitute a rotating body 28, and the first housing 22 is connected with the second disc 26 on the right side.
The first housing 22 is fitted with a screw 29 and fixed to the right end collar of the first housing 22 .

130 is a cooling blade integrally attached to the left side of the first disc 25, 31 is a permanent magnet embedded in the right side of the rotating body 28 and integrally attached via an adhesive, and 32 is a second circular plate. This adjustment part is formed in the plate 26 at a position facing the magnetic generating body described later, and is constituted by a notch in the second disc 26, and is formed in a position facing the magnetic generating body of the second disc 26 at the dead center position of the crank 7. It is formed in a matching position.

33 is a second housing that is inserted into the right side of the shaft 20 and whose left end surface is in contact with the step;
3 is prevented from rotating by a key 34 embedded in the shaft 2o.

35 is a yoke made of two disc-shaped iron plates, which are fixed together by rivets 36, fitted into the second housing 33 from the right side, and fixed together by screws 37. There is.

Reference numeral 38 denotes two magnetic generators provided on the left side of the yoke 35, including a pole 40 made of a magnetic material such as iron and fixed to the yoke 35 with a screw 39, and a magnetic generator provided on the outer periphery of the pole 40. As shown in FIG. 5, both magnetic generators 38 are arranged at asymmetrical positions, and one magnetic generator 38 is connected to the adjustment part 3.
2, the other magnetic generating body 38 faces the second disc 26 on the center side of the adjusting section 32, and each pole 40
The end face of the rotating body 28 faces the second disc 26 of the rotating body 28 with a slight gap therebetween.

42 is a permanent magnet 31 of the rotating body 28 on the left side of the yoke 35.
This is a detection device that detects the permanent magnet 31 that is attached with a screw 43 at a position facing the speed sensor pole 44, which is made of a magnetic material such as iron and has a winding wire around its outer periphery. When the magnetic flux is supplied, a voltage is induced in the winding, and the permanent magnet 31 is detected.

In addition, in FIGS. 5a and 5b, D indicates the vertical dead center of the crank 7.

Next, the operation of the above embodiment will be explained.

When the crank gear 8 is rotated by the foot operation of the pedal 6, this rotational force is transmitted to the gear 24 via the chain 18, and the first housing 22 and the rotating body 28 are rotated together.

When a DC voltage is applied to the winding of the bobbin 41 of the magnetic generator 38, a constant DC magnetic field is generated in the pole 40, and the N-pole 38, the second disc 26 , first disc 25, second disc 26, S pole 38,
A magnetic circuit including the yoke 35 and the north pole 38 is formed.

Also, the second disc 2 of the rotating body 28 rotates in this magnetic field.
An eddy current is generated in the rotor 6, and this magnetic flux and eddy current generate a braking torque in the rotating body 28 in the opposite direction to its rotation.

Note that when the magnetic generator 38 is driven, the yoke 35 is attracted by the magnetic field, or the second housing 33 comes into contact with the stepped portion of the shaft 20, so that its movement in the thrust direction is restrained.

Further, when both cranks 7 are located at the dead center as shown in FIG. faces one of the magnetic generators 38, the generation of eddy currents in the second disc 26 is prevented, and therefore the braking torque is reduced and the load on the crank 7 is reduced.

Here, as shown in the same figure, when the crank 7 is rotated by 90 degrees, the adjustment part 32 of the second disc 26 is positioned on the other magnetic generation body 38 side, but the other magnetic generation body 38 is not adjusted. Since it is located closer to the center than the adjustment section 32 and does not face the adjustment section 32, there is no reduction in braking torque.

On the other hand, the permanent magnet 31 attached to the rotating body 28 is rotated together with the rotating body 28 and supplies magnetic flux to the speed sensor pole 43.

In the detection device 42 that has detected this permanent magnet 31, a voltage is induced in the winding by the magnetic flux generated in the speed sensor pole 43, and the voltage waveform of the obtained voltage is input to the waveform shaping counter. The value is calculated and converted into, for example, per hour, and the speed of the rotating body 28 is displayed on the speed display section 3.

Therefore, according to the embodiment, not only can the same effect as the braking device A shown in FIG.
8, an adjustment section 32 for reducing the generation of eddy current
, it is possible to reduce the braking torque by preventing the generation of eddy current when the crank 7 reaches the dead center, and it is possible to reduce the load when passing the dead center where the pedal 6 depression force becomes weaker. allows for smooth rotation.

Furthermore, since the adjustment portion 32 is constructed by cutting out the second disc 26, it can be easily formed during manufacturing of the second disc 26, and can be made at low cost.

Next, FIGS. 6a and 6b showing another embodiment will be explained.

In the same figure, the same symbols as above indicate the same parts, and the difference is that the crank gear 8 and the second
The speed increasing ratio with the gear 24 integrated with the disc 26 is set to 1:1, the two magnetic generators 38 of the yoke 35 are arranged symmetrically, and both the second disc 26 and the gear 24 are arranged symmetrically at the dead center position of the crank 7. A second disk 2 is provided at a position facing the magnetic generator 38, respectively.
The adjustment portion 32 is formed by a notch of 6.

Therefore, as shown in Figure a, when one of the cranks 7 reaches the top dead center and the bottom dead center, both adjusting parts 32 face both magnetic generators 38, respectively, so that it is possible to reduce the braking torque. Furthermore, as shown in the same figure, as the crank 7 moves away from the dead center, the adjustment section 32 also moves away from the magnetic generator 38, allowing the braking torque to be gradually increased and allowing the crank 7 to rotate smoothly. Can be done.

Next, FIG. 7 showing still another embodiment will be described.

In the system shown in FIG. 7, a braking device is provided integrally with the crankshaft 5, which rotates when the pedal 6 is depressed, without increasing the speed.

That is, a rotating body 28 consisting of a first disc 25 made of iron plate and a second disc 26 made of copper is integrally fixed to the center of the crankshaft 5 rotatably supported by the frame 1, and the casing of the braking device is The right side of the crank 17 is a yoke 35, and the two magnetic generators 38 are attached to the yoke 35 with screws 39 to the rotating body 28 with a slight gap between them. Two adjusting portions 32 are formed by cutouts in the second disk 26 at positions facing the magnetic generation bodies 38 of the second disk 26, respectively.

Therefore, as described above, it is possible to reduce the braking torque at the dead center position of the crank 7, and achieve smooth rotation of the crank 7. Moreover, in this case, a speed increasing device can be eliminated, and the chain 18, etc. There is no noise associated with the transmission of rotational force.

In addition, in the above embodiment, all the adjustment parts 32 are connected to the second disc 2.
Although the configuration is not limited to this, the thickness of the second disk 26 may be reduced, and the second disk 26 may also be configured with a conductor having a lower conductivity than the second disk 26. It is possible to reduce the braking torque by reducing the generation of eddy currents, and to enable smooth rotation of the crank 7.

As described above, according to the braking device for a pedal-type rotating device of this invention, the crankshaft of the crank that pivotally supports the pedals and the rotating body are interlocked, the magnetic generating body is disposed near the rotating body, and the rotating body is In a braking device for a pedal-type rotating device that generates braking torque when the crank rotates, an adjustment part that reduces the braking torque caused by the magnetic generator is formed at a position facing the magnetic generator of the rotating body at the dead center position of the crank. This reduces the load on the dead center position of the crank, where the pedal force is weak, and enables smooth rotation of the crank.Moreover, it can be achieved with a simple configuration of just forming an adjustment part on the rotating body, and is inexpensive. Can be done.

[Brief explanation of the drawing]

Figures 1 and 2 are generally side and front views of a beauty car, Figure 3 is a schematic cutaway front view of the braking device of the conventional pedal-type rotation device, and Figure 4 and the following drawings are the pedal-type rotation of this invention. Embodiments of the braking device of the apparatus are shown, FIGS. 4 and 5 show one embodiment, FIG. 4 is a cutaway plan view, FIG. 5a,
b is a schematic side view showing the operating state, FIG. 63a,
b is a schematic side view showing the operating state of another embodiment, and FIG. 7 is a sectional view of a main part showing still another embodiment. 5...Crankshaft, 6...Pedal, 7...Crank, 26...Second disc, 28...Rotating body, 32...adjustment section, 38...magnetic generator.

Claims (1)

[Claims for Utility Model Registration] ■ The crankshaft of the crank that pivotally supports the pedals and a rotating body are interlocked, a magnetic generator is disposed near the rotating body, and a braking torque is applied when the rotating body rotates. In the braking device for a pedal-type rotation device, an adjustment portion for reducing braking torque caused by the magnetism generator is formed at a position of the rotating body facing the magnetism generator at the dead center position of the crank. Braking device of the device. (2) A braking device for a pedal-type rotating device according to claim 1 of the utility model registration, in which the adjustment portion is constituted by a notch in a rotating body. (2) A braking device for a pedal-type rotating device according to claim 1 of the utility model registration claim, in which the adjustment portion is constructed by reducing the thickness of the rotating body. (2) A braking device for a pedal-type rotating device according to claim 1 of the utility model registration, wherein the adjustment portion is composed of a rotating body and a conductor having a different conductivity.