JPH0257947B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bicycle trainer configured to be used for riding training indoors by attaching a bicycle with the front wheel removed, and which does not emit noise. Moreover, it relates to something that can change the braking force applied to the wheels.

[Conventional technology]

This type of trainer has a frame to which a bicycle body with the front wheel removed can be attached, and this frame has a roller that rotates while contacting the rear tire of the bicycle to which it is attached, and a brake that applies braking to the rotation of this roller. A braking force applying means is provided. As a braking force applying means, instead of the conventional cylindrical fan, an electromagnetic type that can change rotational resistance has recently been proposed. This electromagnetic braking force applying means basically consists of a disc made of an electrically conductive material fixed to the rotating shaft of the roller, and magnets placed opposite each other so as to sandwich this disc. It utilizes the principle that when a disk, which is an electric conductor, cuts the magnetic flux, an eddy current flows through the disk, and the electromagnetic force between this eddy current and the magnetic flux acts in the direction of braking the rotating disk. .

By the way, as shown in FIGS. 14 and 15, the variable braking force mechanism in the electromagnetic braking force applying means described above is comprised of a pair of magnet holding plates b and c arranged to sandwich a rotating disk a. A plurality of magnets d..., e... arranged in an annular shape with alternating polarities are fixed so that one of the magnet holding plates c can be rotated. Then, as shown in Fig. 14, when the magnets d..., e... that sandwich the rotating disk a have opposite polarities, the magnetic flux density between them is the strongest, so the braking force acting on the rotating disk a is the largest. , as shown in Fig. 15, when the magnets d..., e... that sandwich the rotating disk a have the same polarity, the magnetic flux density between these magnets is the smallest, and almost no braking force acts on the rotating disk a. I won't. Therefore,
By rotating one magnet holding plate c relative to the other magnet holding plate b, the state in which the strongest braking force is applied to the rotating disk as shown in FIG. 14 is changed to the state shown in FIG. 15. It is possible to make stepless or stepwise adjustments until almost no braking force is applied to the rotating disc.

[Problem that the invention seeks to solve]

By the way, the above-mentioned conventional electromagnetic braking force applying means has the following problems. In other words, as shown in Figure 14, if the magnets that sandwich the rotating disk have opposite polarities and the magnetic flux passes between these magnets, there is no problem, but as shown in Figure 15, when the rotating disk When the magnets that sandwich the disk have the same polarity, there is a problem in that the opposing magnets apply magnetizing forces in opposite directions to each other, and the magnetic force of the magnets decreases over time. In this case, the braking force to be applied to the rotating roller decreases over time, and eventually the roller becomes unusable as a trainer.

This invention was devised under the above circumstances, and its purpose is to provide an electromagnetic braking force applying means that can adjust the braking force without causing a semi-permanent reduction in the braking force. The purpose of the present invention is to provide a bicycle trainer with a high quality.

[Means to solve the problem]

In order to solve the above problem, this invention takes the following technical measures.

That is, the present invention provides a frame to which a bicycle with the front wheel removed can be mounted and which can be stably fixed on a horizontal floor surface, and a frame that is pivotally supported on the frame and makes contact with the rear wheel of the bicycle mounted on the frame. A bicycle trainer comprising a roller capable of rotating and a braking force applying means for braking the rotation of the roller, wherein the braking force applying means is fixed to a spindle of the roller and rotates integrally with the roller. an electric conductor disk, a first magnet fixedly arranged on one side of the electric conductor disk with a predetermined gap between the electric conductor disk and the first magnet on the other side of the electric conductor disk; a second magnet fixedly arranged with a predetermined gap from the electric conductor disk so that opposite poles of the magnets face each other, and a gap between the first magnet and the electric conductor disk;
and a pair of magnetic shielding members arranged to be extendable into and out of the gap between the second magnet and the conductor disk, and an operation for adjusting the amount by which the magnetic shielding member extends into the gap. It is characterized by comprising means.

[Effect]

The braking force applying means of the trainer of the present invention basically includes a first magnet and a second magnet fixedly disposed on both sides of a conductor disk that rotates together with the roller so that their opposite poles face each other. It is composed of Therefore, lines of magnetic force run between the first magnet and the second magnet, and when the conductor disk rotates, this conductor disk cuts the magnetic flux. Then, an eddy current flows through the conductor disk, and the conductor disk receives a braking force due to the electromagnetic force between the eddy current and the magnetic flux. This braking force acts as a load on the trainee who steps on the pedals of the bicycle, contributing to improving leg strength.

When the magnetic shielding member extends into each gap between the first magnet and the conductor disk and between the second magnet and the conductor disk, the gap between the first magnet and the second magnet is extended. The lines of magnetic force passing through the conductor disk, and more specifically the lines of magnetic force passing through the conductor disk, are partially blocked, as a result of which the magnetic flux density of the lines of magnetic force passing through the conductor disk is reduced. Therefore, the amount of eddy current on the conductor disk in this case also decreases, and the braking force acting on it also decreases. Since the amount by which the magnetic shielding member extends into each of the gaps can be adjusted by the operating means, it is possible to adjust the density of the lines of magnetic force passing through the conductor disk to a desired amount. This means that the braking force acting on the conductor disc can be adjusted as desired. Therefore, the braking force to be applied to the rollers or the wheels of the bicycle can be adjusted as desired in accordance with the progress and method of training or the leg strength of the trainee.

Moreover, in the present invention, since the first magnet and the second magnet placed with the conductor disk in between are opposite to each other with opposite poles, they do not exert magnetization effects in opposite directions. Therefore, there is no concern that the magnetic forces of the first magnet and the second magnet will deteriorate, and the braking force applying means maintains a constant performance semi-permanently.

〔Effect of the invention〕

As a result of the above, in the bicycle trainer of the present invention, the braking force of the braking force applying means can be changed as desired, and the braking force does not decrease, and a constant performance can be maintained for a long period of time. There is. In addition, since the magnetic shielding member adjusts the density of the magnetic flux passing through the conductor disk, it is possible to completely reduce the density of the magnetic flux passing through the conductor disk to zero, and the range of adjustment of the braking force is There are also effects that can be dramatically improved compared to conventional methods.

[Explanation of Examples]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is an overall perspective view of a bicycle trainer according to the present invention.

The frame 1a of the trainer 1 of this example has a front-rear rod 2 extending horizontally at the rear, rising upward at the front, rear legs 3, 3 extending in the left-right direction at the rear of the front-rear rod 2, and It is provided with front legs 4, 4 extending diagonally downward to the left and right at the front rising part 2a of the rod, and a column 5 standing vertically at the middle part of the rod 2 in the front-rear direction, and the front rising part 2a is further extended upward. An extension portion 2b is provided that extends to the vicinity of the handlebar of the bicycle attached to this trainer.

The front rising portion 2a has a front fork clamper 6 for fixing a front fork claw (not shown) of the bicycle.
However, hanger clampers 7 for holding bicycle hanger pipes are provided on each of the pillars 5, and a bicycle with its front wheel removed is fixed with its front fork claw to the front fork clamper 6 and its hanger pipe to the hanger clamper 7, respectively. By this, frame 1
It is designed to be attached to a. An upward channel-shaped bracket 8 is fixed to the rear end of the longitudinal rod 2, and the left and right walls of a support shaft 9 are rotatably supported so as to pass through the left and right walls 8a and 8b of this bracket 8. A cylindrical roller 10 having a predetermined outer diameter is fixed to the portion sandwiched between 8a and 8b in a mantle-like manner. The outer periphery of this roller 10 is brought into contact with the tire of the rear wheel of the bicycle mounted on the frame 1a as described above.

This is the main part of the present invention. Details of the braking force applying means R are shown in FIGS. 2 to 6.

A hub 11 is fixed to one end of the support shaft 9, and a donut disk-shaped conductor disk 13 is fixed to the outer surface of the flange portion 11a of the hub 11 via a washer 12. This conductor disk 13
can be made of aluminum plate, for example. A cover 14 is fixed to the wall 8b of the bracket 8, which accommodates the disk 13 and forms an internal space having a predetermined width on the left and right sides. In this example, the cover 14 is constructed so that two members, a first cover 14a and a second cover 14b formed of resin, are fitted together in the middle, and the first cover 14a is placed in the center. With the support shaft 9 protruding from the hole 15, the wall 8b
The second cover 1 is fixed with screws to the outer surface of the second cover 1.
4b at the peripheral edge of the first cover 14.
It is fixed to the periphery of a with screws or the like.

A cylindrical first magnet 16 having a predetermined thickness is attached to the first cover member 14a, and a retaining plate 17 is mounted such that one surface 16a of the first magnet 16 faces one surface of the conductor disk 13 with a predetermined gap therebetween. It is fixed in the state where it is held. In this example, six first magnets 16..., two of each, share a common holding plate 1.
7, and are arranged at equal intervals on the same circumference while being held by adhesive or the like. In this example, in particular, the holding plates that hold each of the two first magnets 16 placed close to each other in the circumferential direction of the conductive disk 13 are attached to the first cover 1.
Equally spaced 3 surrounded by ribs 18 on the inner surface of 4a
It is fixed inside the accommodation recess 19 at the location with a screw or the like. The holding plates 17 are made of a magnetic material, and the polarities of the surfaces of the two magnets held by each holding plate 17 facing the conductor disk 13 are mutually opposite as shown in FIG. It is the opposite pole. Therefore, the holding plate 17 and the two magnets held thereon act as one magnet as a whole.

Then, a second magnet 20 having a predetermined thickness is also mounted on the second cover 14b, with one surface 20a facing the other surface of the conductor disk 13 with a predetermined gap therebetween. It is fixed while being held by a holding plate 21 made of a magnetic material like the magnet. The second cover 14b is also formed with an accommodation recess 23 surrounded by ribs 22 similar to the first cover 14a, and holding plates 21 each holding two second magnets 20 are installed in the accommodation recess 23. Fixed. The accommodation recess 23 overlaps the accommodation recess 19 on the first cover 14a side in the circumferential direction of the disk 13. Similarly to the first magnet, the two magnets held by each holding plate 21 have opposite polarities on their faces facing the conductor disk 13. Therefore, the holding plate 21 and the two magnets 20 held thereon act as one magnet as a whole. However, the first magnet 16 and the second magnet 20, which sandwich the conductive disk 13 therebetween, are opposite to each other with the disk 13 interposed therebetween, and have opposite polarities. Therefore, a line of magnetic force passes between the first magnet 16 and the second magnet 20 from one north pole to the other south pole.

A magnetic shielding plate made of a magnetic material is provided in the gap 24 between the first magnet group 16 and the conductor disk 13, and in the gap 25 between the second magnet group 20 and the conductor disk 13. 26 and 27 are respectively arranged around the center of rotation of the disk 13 so that their rotational positions can be adjusted. The first magnetic shielding plate 26 disposed between the first magnet group 16 and the conductor disk 13 is formed in a substantially donut disk shape, and has the above-mentioned ribs formed on the inner surface of the first cover 14a. 18 and is held in a non-contact manner with respect to the first magnet 16 through a slight gap, and is moved toward the disk 13 by a hook 28 extending from an appropriate part of each holding plate 17. It is designed to be able to rotate while being blocked.

On the other hand, the second magnet group 20... and the conductor disk 1
The second magnetic shielding plate 27 between the hooks 2 and 3 contacts the above-mentioned ribs 22 formed on the inner surface of the second cover 14b, and the hooks 2 extending from each retaining plate 21.
9 prevents movement toward the disk 13 side, and a center support portion 27b that bulges outward so as to avoid the support shaft 9 or the hub 11. The center support portion 27b is rotatably supported about the shaft 32 with respect to the second cover 14b. The shielding portion 27a of the second magnetic shielding plate 27 and the first magnetic shielding plate 26 face each other with the conductor disk 13 in between, and each has a fourth
Openings 30 and 31 as shown in the figure are formed. That is, these openings 30, 31 are radially located at the first and second magnets 16, 20.
and corresponds to the position of each holding plate 17, 2.
1 each holding two magnets on a conductor disk 1
The size is set so that it can be viewed towards the 3rd. In this example, the length in the circumferential direction of each of the openings 30 and 31 is such that the circumferential angle with respect to the center of the disk 13 is approximately 60 degrees in accordance with the interval between the two magnets held on each holding plate 17 and 21. is set to . That is,
In each magnetic shielding plate 26, 27, openings 30, 31 and non-openings 33, 34 are alternately and continuously provided in an annular shape every 60 degrees. Then, the positions of the openings 30 and 31 in the circumferential direction are adjusted to the positions of the openings 30 and 31 held by the respective holding plates 17 and 21, as shown in FIG.
When the first magnets 16... and the second magnets 20 correspond to the positions of the conductor disks 13 through the openings 30 and 31, respectively,
When the magnetic shielding plates 26, 27 are rotated 60 degrees from this state, the non-opening portions 33, 34 are located between the first magnets 16 and the conductor disk 13 and between the second magnet 20 and the conductor disk 13 are magnetically shielded.

As shown in FIG. 5, the first magnetic shielding plate 26 and the second magnetic shielding plate 27 are provided on the periphery of the cover 14 by extending a portion of their respective peripheries in the radial direction. The operating arms 35 and 36 which are projected from the slit 37 to the outside are joined by an operating grip 38, so that they are integrally connected to each other. The slit 37 also plays the role of regulating the rotation angle range of the operating arms 35 and 36 that are inserted through it, and its length and position on the cover 14 are determined by the magnetic shielding plates 26 and 27 shown in FIG. It is set so that it can be rotated approximately 60 degrees from the position shown in . In addition, the second magnetic shielding plate 27 and the second cover 1
4b, there are a plurality of engagement holes 39 arranged in an arc shape in the magnetic shielding plate 27, as shown in detail in FIG.
and a locking ball 41 urged toward the magnetic shielding plate 27 by a spring 40 on the second cover 14b side. When the second magnetic shielding plates 26 and 27 are rotated, they are locked in stages with a sense of moderation at each predetermined rotation angle. However, whether or not to provide this step locking mechanism is a matter of choice, and it is sufficient to simply provide a certain resistance to the rotation of the first and second magnetic shielding plates 26 and 27.

Furthermore, in the braking force applying means R of this example,
A cooling mechanism is provided to effectively discharge heat generated in the conductor disk 13 to the outside of the cover 14 when resistance is applied. That is, the first cover 14a and the second cover 14b to the second magnetic shielding plate 27
Inlet holes 42, 43, and 44 are provided near the center of the cover 14 to communicate the outside and the inside of the cover 14, and slits are provided at the joint between the first cover 14a and the second cover 14b, that is, at the peripheral edge of the cover 14. A shaped exhaust hole 45 is provided, and radial fins 46 as shown in FIG. 6 are provided on the flange portion 11a of the hub 11 that supports the conductor disk 13. Further, in this example, a through hole 47 is also provided in the vicinity of the attachment portion of the conductor disk 13 to the flange 11a to ensure air circulation between the left and right sides of the conductor disk 13 inside the cover 14. That is, the configuration of the cooling mechanism described above generates a forced flow of air inside the cover 14 by an action similar to that of a so-called centrifugal pump, and this forced air flow reduces the heat generated particularly in the conductor disk 13. It is intended to be discharged to the outside. That is, the support shaft 9 or the hub 11
While the fins 46 are rotating, the fins 46 generate an air flow radially outward from the radial center within the cover, so that outside air flows into the intake holes 42,
The air is continuously introduced into the cover 14 from 43 and 44, flows radially inward inside the cover along the conductor disk 13, and then is exhausted to the outside through the exhaust hole 45. At this time, since cold air from the outside always flows into the cover, the cooling effect of the conductor disk 13 is excellent, and the temperature inside the cover does not increase due to heat accumulation. Moreover, the fins 46 are connected to the conductor disk 1.
Since the heat exchange area of the hub 3 or the hub 11 is increased, the above-mentioned cooling effect is further promoted.

On the other hand, a flywheel 48 is fixed to the other end of the support shaft 9. In this example, the external shape of the flywheel 48 is the same as that of the second cover 14b, and a cover 49 having the same shape as the first cover 14a is fixed to the wall 8a inside the flywheel. By making great efforts, the outer appearance of the right and left sides of the roller 10 is arranged to be approximately symmetrical.

Next, the operation of the bicycle trainer of this example will be explained with reference to FIGS. 7 to 9.

As shown in Figure 1, when a rider on a bicycle attached to this trainer rotates the pedals and rotates the wheels,
The roller 10 is rotated, and the conductor disk 13 is also rotated integrally therewith. Here, the first and second magnetic shielding plates 26, 27 are in a state where their openings 30, 31 face the first and second magnets 16, 20 toward the disk 13, as shown in FIG. As schematically shown in FIG. It rotates while cutting the magnetic flux between the magnets. Then, eddy radio waves flow through the conductor disk 13, and the conductor disk receives a braking force due to the electromagnetic force between the eddy current and the magnetic flux. If the magnetic flux density is constant, this braking force increases in proportion to the rotational speed of the conductor disk. Therefore, as the pedal rotation speed increases, the braking force increases, and this corresponds to the change in resistance caused by wind pressure when the vehicle is actually running.

And the first and second magnetic shielding plates 26, 2
7 rotates from the state shown in FIG. 7, and as schematically shown in FIG. Eventually, these magnetic shielding plates 26, 27
Since each of the above magnets 16 is made of magnetic material,
..., 20... shields the magnetic flux passing between them. Then, as schematically shown in FIG.
The non-opening portions 33 and 34 of 6 and 27 are connected to each magnet 16...,
20 completely covers, no lines of magnetic force will pass between the first magnet 16 and the second magnet 20. That is, by rotating the magnetic shielding plates 26 and 27,
The magnetic flux density of the lines of magnetic force passing between the first magnets 16 and the second magnets 20 is calculated from the maximum state shown in FIG.
This means that it can be changed to the 0 (zero) state shown in FIG. The braking force applied to the conductor disk 13 that cuts the magnetic flux increases in proportion to the magnetic flux density if the rotation speed is constant. Therefore, in the present invention, the braking force to be applied to the conductor disk 13 is set to ), that is, from a state where no braking force is applied to a state where a predetermined braking force is applied.
It can be varied within an extremely wide range.

Thereby, the resistance force to be generated by the braking force applying means R can be varied over a wide range, and optimal training can be carried out according to the physical strength of the trainee, the training progress level, and the training method.

Moreover, in the present invention, since the first magnet 16 and the second magnet 20 are fixed so that their opposite poles face each other, they do not give opposite magnetizing forces to each other, and therefore, Each magnet 16, 20 is semi-permanently free from deterioration, and the braking force applying means R
The performance can be maintained constant for a long period of time. This means that in order to change the magnetic flux density passing through the conductor disk 13, a plurality of second magnets are displaced in the circumferential direction of the disk with respect to a plurality of first magnets, so that the first magnet This is an excellent effect that could not be imagined in the conventional example, in which the magnet and the second magnet were changed from a state in which opposite poles faced each other to a state in which the same poles faced each other.

Of course, the scope of the invention is not limited to the embodiments described above.

For example, in the embodiment, two first magnets 16 and two second magnets 20 are each held by holding plates 17 and 21 made of magnetic material, but the first magnet 16 and the second magnet 20 of the present invention The arrangement structure of the second magnet is not limited to this. That is, the first magnet and the second magnet may be simply arranged at equal intervals. In that case, it goes without saying that the configuration of the magnetic shielding plate should also be changed depending on the arrangement of the magnets. That is, it is only necessary that the magnets can be changed from a state in which each magnet faces the conductor disk 13 to a state in which each magnet is completely covered. Furthermore, in the embodiment, the magnetic shielding plate extends into the gap between the magnet and the conductor disk by rotation, but by sliding in the radial direction of the disk, for example,
It is also within the scope of the invention to be able to extend into the gap between the magnet and the conductor disk.

Furthermore, in the embodiment, in order to rotate the first and second magnetic shielding plates 26, 27, the operating arms 35, 36 integrally extended therefrom are manually rotated. Plate 26,
If 27 can be rotated by remote control while the rider is on the bicycle, it will be even more convenient to use.

For example, as shown in FIG. 10, the second magnetic shielding plate 27 is constantly biased in the direction of arrow A in FIG. The other end of the operating cable W, one end of which is fixed via the reel portion 51, is routed to the frame 1a near the handlebar of the bicycle, and the other end of the operating cable W is shown in FIGS. 11 to 13. It may be towed by an operating lever 52 such as the following.

This operating lever 52 is attached to an extension part 1b which extends the frame 1a of the trainer body further to the vicinity of the handlebar of the bicycle, and is attached to an extension part 1b shown by arrow B in FIG.
When rotated in the direction, the cable W is pulled and the second magnetic shielding plate 27 can be rotated against the biasing force of the spring 50. Further, as shown in FIG. 13, the lever is moved by the biasing force of the spring 50 due to mutual engagement between the ratchet pawl 53 formed on the side surface of the lever 52 and the ratchet tooth row 54 formed at an appropriate portion of the lever support. It is designed to be held at a desired rotational position opposite to. Then, in order to return and rotate this lever in the direction of arrow A, the 11th
As shown in the figure, the lever 52 may be rotated in the direction of arrow Q to disengage the ratchet pawl from the ratchet tooth row.

Furthermore, the first and second magnetic shielding plates 26,
In addition to being rotated manually as described above, the motor is configured to be rotated by a driving means such as a motor, and the motor is turned on and off by an electric switch located at a position where it can be operated while the passenger is in the vehicle.
It is also possible to turn it off.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a bicycle attached to the bicycle trainer of the present invention, and Fig. 2 is a cross-sectional view of the braking force applying means, which is the main part of the present invention, and corresponds approximately to the - line cross section in Fig. 4. Figure 3 is a cross-sectional view taken along the - line in Figure 2, Figure 4 is a cross-sectional view taken along the - line in Figure 2, Figure 5 is a cross-sectional view taken along the - line in Figure 4, and Figure 6 is a cross-sectional view taken along the - line in Figure 4. A side view showing a hub for fixing or a fan formed on the hub, FIGS. 7 to 9 are action explanatory views, FIG. 10 is a view corresponding to FIG. 4 showing another embodiment, and FIG. 11. 12 is an explanatory diagram of an embodiment of the remote control mechanism, and is a diagram corresponding to the cross section taken along the line XI-XI in FIG. 12, and FIG.
13 is a sectional view of the ratchet mechanism, and FIGS. 14 and 15 are explanatory views of a conventional example. 1...Trainer, 9...Spindle, 10...Roller, 13
...Conductor disk, 16...First magnet, 20...Second magnet, 26...First magnetic shielding member (plate), 2
7...Second magnetic shielding plate.

Claims (1)

[Scope of Claims] 1. A frame to which a bicycle with its front wheel removed can be mounted and which can be stably placed on a horizontal floor, and a frame that is pivotally supported on the frame and attached to the rear wheel of the bicycle attached to the frame. A bicycle trainer comprising a roller that can rotate in contact with the roller and a braking force applying means for braking the rotation of the roller, wherein the braking force applying means is fixed to a spindle of the roller and rotates integrally with the roller. a first magnet fixedly disposed on one side of the conductor disk with a predetermined gap between the conductor disk and the first magnet on the other side of the conductor disk; a second magnet fixedly arranged with a predetermined gap from the electric conductor disk so that opposite poles of the magnets face each other, and a gap between the first magnet and the electric conductor disk; and a pair of magnetic shielding members arranged to be extendable into and out of the gap between the second magnet and the conductor disk, and an operation for adjusting the amount by which the magnetic shielding member extends into the gap. A bicycle trainer comprising: means.