JPH0687901B2 - Rotational resistance generator and bicycle trainer using the same - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a rotational resistance generator and a bicycle trainer using the same.

[Prior art]

BACKGROUND ART There is a bicycle trainer as a training device for athletes of bicycle competitions such as sprint competitions and road race competitions to perform leg strength improvement training in a state of riding a bicycle indoors. This bicycle trainer has, for example, a frame on which a bicycle can be mounted and a rear wheel of the bicycle mounted on this frame, as disclosed in Japanese Patent Laid-Open No. 63-229076 previously proposed by the applicant of the present application. The rotating body is provided in contact with the rotating body, and the resistance applying means for applying resistance to the rotation of the rotating body. The above-mentioned resistance imparting means was mainly using a fan before, but noise such as wind noise is generated,
Since there is a problem in that the magnitude of resistance cannot be changed significantly and easily, recently, a structure in which magnetic resistance is used to impart rotational resistance has become mainstream. In the bicycle trainer disclosed in JP-A-63-229076,
A magnetic resistance applying means is used, and its configuration is
The outline is as follows. That is, the above-mentioned magnetic force type resistance imparting means fixes a rotating disc made of aluminum on a shaft that rotates together with a rotating body that comes into contact with a bicycle wheel, and on both sides of this rotating disc,
Basically, permanent magnets are arranged so that opposite poles face each other. Since the rotating disc made of aluminium, which is a good conductor, rotates across the magnetic flux passing between the magnets arranged on both sides of the rotating disc, an eddy current is generated in this rotating disc, which causes the rotating disc. The resistance acts on the rotation of. The resistance force acting on the rotating disk changes depending on the strength of the magnetic flux that it crosses. In view of this, in the bicycle trainer proposed in the above publication, the resistance force is made variable as follows. That is, it is possible to adjust the rotational position of the shield plate made of a magnetic material having a window hole between the rotating disc and the magnet on one side thereof and between the rotating disc and the magnet on the other side. Inserted and placed. The shield plate is rotatable between a non-shielded position in which the window faces each magnet toward the rotating disk and a shielded position in which a portion other than the window hole shields each magnet. When the shield plate takes the shield position, magnetic flux does not pass between both magnets that sandwich the rotating disk, and therefore eddy current is not generated in the rotating disk, so that resistance does not act on the rotating disk. On the other hand, when the shield plate is in the non-shielded position, magnetic flux passes between both magnets through the window hole, so eddy current is generated in the rotating disk,
The resulting resistance acts on the rotating disk. The strength of resistance is
It can be appropriately changed by changing the degree to which the window hole faces both magnets toward the rotating disk.

[Problems to be Solved by the Invention]

By the way, the magnetic resistance imparting means having the above structure has the following problems. First, it has a complicated structure and is extremely troublesome to assemble. That is, in the above resistance applying means, it is necessary to fix the rotating disc to the shaft rotatably supported by the bracket, and to dispose the magnets on both sides sandwiching the rotating disc through a predetermined clearance. . Therefore, a large number of magnets and a pair of shield plates for shielding both sides of the rotating plate and each magnet group are required, and the number of basic constituent members is very large.
Also, for the convenience of assembly, first, the bracket rotatably supports the shaft, and then a member that holds the first magnet group to be arranged inside the rotating disc is attached, and then the rotating circle is attached to the shaft. Since it is necessary to fix the plate and then to assemble the member that holds the second magnet group to be arranged on the outer side of the rotating disk to the member that holds the first magnet group, The member that holds the magnet group and the member that holds the second magnet group must be divided into two parts, which increases the number of parts of the peripheral component members. The second is that it requires very cumbersome adjustment work. That is, in order for the above resistance applying means to operate without any inconvenience, it is necessary to make the clearance between the rotating disk and each magnet group as small as possible, and moreover, the rotating disk and each magnet group contact each other. This shouldn't happen, but the adjustments for that are very cumbersome. For example, if the shaft center of the member that holds the first magnet group is slightly tilted with respect to the shaft center of the shaft that supports the rotating disk due to an error in the mounting surface with respect to the bracket, the first magnet group will be immediately released. The result is that either of the holding magnets contacts the shield plate or the rotating disc. Once this happens,
Since the rotating disk is hidden inside the member holding the first magnet group and the member holding the second magnet group and cannot be seen from the outside, the adjustment work for avoiding the contact is very troublesome. It will be something. The present invention has been devised under the above circumstances, and has a simple structure, the number of parts is greatly reduced, the assembling work and the adjusting work are easy, and the resistance to be applied is An object of the present invention is to provide a new magnetic resistance type rotational resistance generator whose size can be changed and a bicycle trainer using the same.

[Means for Solving the Problems]

In order to solve the above problems, the present invention takes the following measures. That is, the rotational resistance generating device according to claim 1 of the present application is a rotating body rotatably supported around a support shaft, and a non-magnetic material conducting portion formed on a side surface of the rotating body via a magnetic body portion. And at least one set of magnet means arranged and fixed so as to face the non-magnetic member good conducting portion through a gap,
Inserted between the non-magnetic material good conducting portion and the magnet means,
Between the non-shield position where the magnetic pole surface of the magnet means faces the non-magnetic material good conducting portion and the shield position which shields between the magnetic pole surface of the magnet means and the non-magnetic material good conducting portion. And a shield member made of a magnetic material whose position can be adjusted. The magnet means connects the back surfaces of two magnets whose magnetism is arranged in parallel to a common magnetic material, or one magnet. By molding a pair of magnetic pole faces different from each other to face the non-magnetic material good conducting portion of the rotating body, and the magnetic means and the magnetic body behind the non-magnetic material conducting portion of the rotating body. It is characterized in that a closed loop of magnetic flux can be formed with the section. The bicycle trainer according to claim 2 of the present application is
A frame on which a bicycle or a part of a bicycle can be mounted and supported rotatably around a spindle fixed to this frame,
Further, a rotating body which is rotated by contacting the rear wheel of the mounted bicycle, a non-magnetic body good conducting section formed on a side surface of the rotating body through a magnetic body section, and the non-magnetic body good conducting section. Is inserted between at least one set of magnet means arranged and fixed so as to face each other with a gap therebetween, and the non-magnetic body good conducting portion and the magnet means, and the magnetic pole surface of the magnet means is set to the non-magnetic side. It is composed of a magnetic material whose position can be adjusted between a non-shielding position facing the magnetic material good conducting portion and a shield position which shields between the magnetic pole surface of the magnet means and the non-magnetic material conducting portion. The magnet means is provided with a shield member, and the magnet means is formed by connecting the back surfaces of two magnets arranged in parallel with opposite polarities to a common magnetic body, or by molding one magnet, thereby forming a pair of different magnets. The magnetic pole faces of the Means, characterized in that it is configured as a closed loop of the magnetic flux between the magnetic body portion behind the non-magnetic electrically good portion of the rotating body can be formed. Further, the bicycle trainer according to claim 3 of the present application is the bicycle trainer according to claim 2, wherein the rotating body is substantially provided with a smooth concave groove around which the wheel of the bicycle fits and contacts. It is characterized by the shape of a drum. Furthermore, the bicycle trainer described in claim 4 of the present application is the bicycle trainer described in claim 3, wherein the rotating body is made of aluminum and a magnetic plate is further attached by attaching an iron plate to the side surface thereof. It is characterized in that a non-magnetic material good conducting portion is formed by laminating an aluminum plate thereon.

[Operation and effect of the invention]

In the rotational resistance generator of the present invention, when the shield member is in the non-shielded position, the magnetic means and the magnetic body portion behind the non-magnetic body good conducting portion of the rotating body form a closed loop of magnetic flux. The magnetic body portion rotates with the rotating body, but the magnet means for generating the magnetic flux is fixedly arranged, so that the closed loop of the magnetic flux is formed regardless of whether the rotating body is rotating or not. It Therefore,
The non-magnetic material good conducting portion that rotates together with the rotating body rotates across the magnetic flux forming the closed loop as described above, and an eddy current is generated in this non-magnetic material conducting portion. A resistance acts on the rotation of the body-conducting portion or the rotating body that rotates integrally with the body-conducting portion. On the other hand, when the shield member takes the shield position, a closed loop of magnetic flux is formed between the magnet means and the shield member, and the magnetic force does not affect the magnetic body portion of the rotating body. Therefore, at this time, the non-magnetic material good conducting portion does not cross the magnetic flux, and the resistance force does not act on it. Further, since the shield member can adjust between the non-shield position and the shield position, it is possible to change the magnetic flux density of the closed loop of the magnetic flux formed between the magnet means and the magnetic body portion of the rotating body. Therefore, the amount of the eddy current or the magnitude of the resistance force generated in the non-magnetic material conducting portion during rotation can be changed as desired. The bicycle trainer of the present invention using the above rotation resistance generating device is rotated by the rotation of the rear wheel of the bicycle whose rotating body is supported by the frame. Since the rotational resistance acts on the rotating body as described above, a rider riding a bicycle mounted on the trainer will rotate the wheels against the above rotational resistance, and therefore, in training for improving leg strength. Become. Further, the rotational resistance force can be easily changed by changing the position of the shield member, so that the trainee can select an appropriate rotational resistance according to his / her leg force. In the rotating resistance generator of the present invention, the rotating body itself is provided with the magnetic body portion that should cooperate with the magnet means to form the loop of the magnetic flux. Therefore, in the assembly process, the non-magnetic body portion and the magnetic body portion are combined. There is no need to make subtle adjustments. Also,
Since the magnet means is arranged so as to face the side surface of the rotating body, the mutual position adjustment between the side surface of the rotating body and the magnet means or the shield member is much easier than in the past. is there. Further, as described in claim 3, in the bicycle trainer, by making the rotating body into a substantially drum shape with a smooth concave groove around which the wheels of the bicycle fit and contact,
The attachment to the frame of the bicycle and the contact of the wheel of the bicycle with the rotating body with appropriate pressing force are conveniently performed.

[Explanation of Examples]

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing a state in which the rotational resistance generating device 1 of the present invention is applied to a bicycle trainer 2 and a bicycle is mounted on the trainer 2. The bicycle trainer 2 of the embodiment has a frame 9 composed of substantially U-shaped front legs 5 and rear legs 6 which can be expanded and folded around a pivot portion 4 corresponding to a hub axle 3 of a rear wheel of the bicycle.
As shown in FIG. 1, it is stably installed on the floor surface by expanding in an inverted V shape when viewed from the side. A pair of screw shafts 8 each having a clamper 7 capable of accommodating and holding both ends of the hub axle 3 of the rear wheel of the bicycle are screwed forward and backward in the pivotal portion 4, that is, in the hub axial direction. Is attached to. The bicycle is mounted on the frame by screwing the pair of screw shafts 8 and clamping both ends of the hub shaft 3 by the clampers 7, 7. The rotation resistance generator 1 is attached to the horizontal rod 10 at the lower end of the rear leg 6. As shown in detail in FIG. 2, the rotational resistance generating device 1 includes a bracket 11 having a substantially U shape mounted on the horizontal rod 10, and all the constituent members are mounted on the bracket 11. First, a pair of left and right supporting walls of the bracket 11
A support shaft 12 is fixed so as to bridge between the support shafts 11a and 11b, and a rotating body 13 is rotatably supported at the center of the support shaft 12 in the axial direction via left and right bearings 14 and 14. Rotating body 13
Can be made of, for example, a light alloy such as aluminum, and is formed in a substantially drum shape having a smooth groove 13a into which a tire portion of a bicycle wheel is fitted, as shown in the illustrated example. With such a shape, it is easy to define the relationship between the rotating body 13 and the wheel, and the wheel rotates while being guided by the flange portions 13c, 13c that sandwich the concave groove 13a. Smooth rotation of the body 13 is ensured. In the illustrated example, the resistance imparting means for imparting the rotational resistance due to the magnetic force to the rotating body 13 is provided on both sides of the rotating body 13 in the illustrated example, but in the following, in order to avoid complication of the description. The one resistance applying means will be described as a representative. First, on the side surface of the rotating body 13, the non-magnetic material good conducting portion 1 formed via the magnetic material portion 15 is provided. In the example,
A donut-shaped recess 13b having a donut shape in a side view is formed on the side surface of the rotating body 13, and in the recess 13b, a donut disk-shaped iron plate 15 as a magnetic body part is sequentially cut so as to correspond to the shape. And a donut disk-shaped aluminum plate 16 as the non-magnetic material conductive part 16 is fitted and screwed.
It is fixed to the rotating body by 17. When the rotating body 13 itself is formed of a magnetic material such as iron, the rotating body 13
Since it itself functions as the magnetic material portion 15, it is sufficient to attach the aluminum plate 16 as the non-magnetic material good conducting portion to the equivalent portion. The inner surface of the opposing support wall 11a of the bracket 11 and the rotating body 13
A case body 21 for holding a magnet means 19 described later and a shield plate 20 is fixed in a space between the side surface of the support shaft 12 and the side surface of the support shaft 12 via a bush 18 fixedly fitted to the support shaft 12. The case body 21 is in the form of a disc having a predetermined thickness and has a central boss portion 22 fitted over the bush 18, and a set screw 23 inserted from the outer periphery of the central boss portion 22 is attached to the bush 18.
It is fixed by screwing toward. Further, the outer diameter of the disk substantially corresponds to the outer diameter of the flange portion 13c of the rotating body 13. On the inner surface of the case body 21, a housing recess 24 for magnet means is provided.
Is formed in an annular shape, and further on the outer circumference thereof, an annular receiving and supporting wall 25 for holding the position of a disk-shaped shield plate 20 to be described later and rotatably holding the position, and inward from the outer peripheral portion thereof. A protruding tubular flange 26 is formed. In the accommodating recess 24, a pair of cylindrical permanent magnets 28a, 28b are attached to the iron plate 27 by adhesion or the like, and a magnet means 19 is provided.
However, it is housed and fixed in three places for each central angle of 120 degrees. The pair of permanent magnets 28a, 28b of the magnet means 19 have polarities opposite to each other, and one of the inner faces, that is, the magnetic pole faces P _N , P _S facing the rotating body 13, is the N pole and the other is the S pole. There is. Each magnet means 19 is fixed to the case body 21 by screwing a screw 29 inserted from the front surface side of the case body 21 into a screw hole formed in the iron plate 27. And further, the magnet means arranged as described above.
In the clearance between each magnetic pole surface P _N , P _{S of} 19 and the non-magnetic material good conducting portion 16 on the side surface of the rotating body 3, the magnetic pole surface P _N , P _S is made of the non-magnetic material conducting portion. A shield plate made of a magnetic material whose position can be adjusted between a non-shielding position facing the 16 and a shielding position for shielding between the magnetic pole surfaces P _N , P _S and the non-magnetic substance conducting portion 16. 20 are inserted. In the example, this shield plate
While forming 20 a thin iron plate into a donut plate shape,
Corresponding to the position of each magnet means 19 described above, its magnetic pole face P _N ,
It is configured by opening three window holes 31 that can face P _S , and the side surface of the peripheral portion is slidably supported by an annular support wall 25 provided on the inner surface of the case body 21. . In addition, the shield plate 20 has a cylindrical flange 26 with the outer periphery described above.
Since it is restrained by, it can rotate around the support shaft 12.
The peripheral portion is offset with respect to the central portion where the window hole 31 is provided, and by setting this offset amount to an appropriate amount, the gap between the magnet means 19 and the shield plate 20 is set. The required minimum clearance is formed. In the embodiment, the detent mechanism capable of stepwise locking the shield plate 20 at a predetermined turning angle with a feeling of moderation.
32 is added. That is, as shown in detail in FIG. 4, a plurality of detent holes 33 ... Lined up at a predetermined interval are formed on the outer peripheral portion of the shield plate 20, while the detent holes on the annular support wall 25 of the case body 21 are formed. The detent mechanism 32 is configured by embedding a detent ball 35 biased by a spring 34 in a portion corresponding to 33 ... Above detent hole
The relative position between 33 ... and the detent ball 35 is
As shown in FIG. 3, the shield plate 20 has a window hole 31
From the pole face P _N of the magnet unit 19, from the state taking the rotational position (unshielded position) for exposing the complete P _S, the pole face P _N by a portion other than the window opening of the shield plate 20, the complete P _S It goes without saying that it should be set so that it can be rotated stepwise in a stepwise manner up to the state of covering the rotation position (shield position). In FIG. 4, reference numeral 36 indicates a detent ball 35 urged by a spring 34,
A floating prevention plate attached to the case body 21 in order to prevent the shield plate 20 from floating above the annular receiving and supporting wall 25. Further, an operation arm 37 for rotating the shield plate 20 and a shield plate in another resistance applying means formed on the other side surface of the rotating body 13 are connected to the outer periphery of the shield plate 20 by a connecting member 38. A connecting stay 39 is integrally formed so as to extend radially outward. In the above configuration, first, the shield plate 20 is rotated by operating the operation arm 37, and the window hole 31 thereof is set to a non-shield position where the magnetic pole surfaces P _N and P _S of the magnet means 19 are completely exposed. Then, as schematically shown in FIG. 5, the magnetic means 19 and the iron plate (the magnetic body portion 15) behind the aluminum plate (the non-magnetic body good conducting portion 16) on the side surface of the rotating body 13 generate the magnetic flux. Form a closed loop L ₁ . Since the magnet means 19 is fixedly arranged in the case body 21, the constant closed loop L ₁ is formed regardless of whether the rotating body 13 is rotating or not. Then, during the rotation of the rotating body 13, the aluminum plate 16 integral with the rotating body 13 rotates across the magnetic flux forming the closed loop L ₁ as described above, and as a result, the aluminum plate 16 is swirled. When a current is generated, a braking force acts on the aluminum plate 16 and the rotating body 13 which is integral with the aluminum plate 16. On the other hand, by operating the operation arm 37, the shield plate
20 is rotated, and the parts other than the window hole 31 are the above magnetic pole surfaces.
When the shield position for completely shielding P _N and P _S is taken, as shown schematically in FIG. 6, the magnet means 19 and the shield plate
20 forms a closed loop L ₂ of magnetic flux, and the aluminum plate 16 on the side surface of the rotating body 13 is placed outside the closed loop L ₂ . Therefore, the aluminum plate 16 does not cross the magnetic flux due to the magnet means 19 and the eddy current is not generated, and the braking force by the magnetic force does not act at all. The braking force can be changed by selecting the extent to which the window hole 31 faces the magnetic pole surfaces P _N and P _S by rotating the shield plate 20. In the embodiment, a pair of the resistance applying means is formed on both sides of the rotating body 13, and each of these shield plates 20 is
They are connected by a connecting member 38. Therefore, when the shield plate 20 of one of the resistance applying means is rotated as described above, the shield plates of both the resistance applying means rotate in conjunction with each other. In addition, the rotational resistance generating device 1 of the embodiment is easy to assemble and adjust, as will be described below. First, the rotating body 13 and the magnetic body part 15 or the non-magnetic body good conducting part 16
Can be simultaneously formed when the rotating body 13 is manufactured, and therefore adjustment between them is unnecessary when assembling the rotation resistance generator. Secondly, magnet means 19 for generating resistance in cooperation with the magnetic body portion 15 and the non-magnetic body good conducting portion 16, and
The shield plate 20 capable of adjusting the resistance is arranged to face the side surface of the rotating body 13 so as to be adjacent in the axial direction,
Unlike the conventional case, the rotating body and the magnet sandwiching the rotating body are not arranged inside the case (magnet group holding member), so that the assembly is easy and the clearance between the magnet means and the rotating body can be adjusted. This can be done by easy work while visually recognizing from the outside. Of course, the scope of the present invention is not limited to the above embodiments. For example, in the embodiment, the resistance applying means is arranged on both sides of the rotating body 13, but this may of course be arranged on one side. Further, three magnet means 19 are provided for the resistance applying means on one side, but the number may be appropriately determined according to the magnitude of the magnetic force of the magnet itself. Further, in the embodiment, the shield plate is rotatable around the support shaft so that the position can be adjusted between the shield position and the non-shield position, but it is slid in the radial direction to shield the magnetic pole faces P _N and P _S. Alternatively, it is also possible to select a state in which it is not shielded. Further, in the embodiment, as each magnet means 19, two permanent magnets 28a and 28b having opposite polarities are fixed to the common iron plate 27, but one long permanent magnet is, for example, U-shaped. It may be bent so that both end faces thereof are directed to the rotating body as two magnetic pole faces having opposite polarities.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which an embodiment of the rotation resistance generator of the present invention is applied to a bicycle trainer and a bicycle is mounted on the bicycle trainer, and FIG. 2 is an embodiment of the rotation resistance generator of the present invention. Partial vertical cross-sectional view from the rear, Fig. 3 is III-II in Fig. 2.
A sectional view taken along the line I, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIGS. 1 ... Rotational resistance generator, 2 ... Bicycle trainer, 9
…… Frame, 12 …… Support shaft, 13 …… Rotating body, 15 …… Magnetic body part, 16 …… Non-magnetic body good conducting part, 19 …… Magnet means, 20 ……
Shield plate, 27 …… Iron plate, 28a, 28b …… Permanent magnet, P _N , P
_S: Magnetic pole surface.

Claims (4)

[Claims] 1. A rotary body rotatably supported around a support shaft, a non-magnetic body good conducting section formed on a side surface of the rotary body via a magnetic body section, and a non-magnetic body good conducting section. The magnet means is inserted between at least one set of magnet means arranged and fixed so as to face each other with a clearance, and the non-magnetic body good conducting portion and the magnet means. A shield member made of a magnetic material whose position can be adjusted between a non-shield position facing the good conducting portion and a shield position shielding between the magnetic pole surface of the magnet means and the non-magnetic good conducting portion. And the magnet means connects the back surfaces of two magnets arranged in parallel with opposite polarities to a common magnetic body, or
By molding one magnet, a pair of magnetic pole surfaces different from each other are arranged side by side to face the non-magnetic material good conducting portion of the rotating body, and the magnet means and the non-magnetic body good conducting portion of the rotating body are placed behind. A rotating resistance generating device, characterized in that a closed loop of magnetic flux can be formed with a certain magnetic body portion. 2. A frame on which a bicycle or a part of a bicycle can be mounted, and a frame which is rotatably supported around a support shaft fixed to the frame and which is rotated by contacting the rear wheel of the mounted bicycle. The rotating body, the non-magnetic material good conducting portion formed on the side surface of the rotating body via the magnetic body portion, and at least one fixed and arranged so as to face the non-magnetic body good conducting portion with a clearance. A pair of magnet means, a non-shielding position which is inserted between the non-magnetic material good conducting portion and the magnet means, and which faces the magnetic pole surface of the magnet means toward the non-magnetic material conducting means, and the magnet. And a shield member made of a magnetic material whose position can be adjusted between a shield position for shielding between the magnetic pole surface of the means and the non-magnetic body good conducting portion. Connect the back surfaces of two magnets arranged side by side to a common magnetic body, Alternatively, by molding one magnet, a pair of magnetic pole faces different from each other are aligned to face the non-magnetic material good conducting portion of the rotating body, and the magnet means and the non-magnetic material good conducting portion of the rotating body are arranged. A bicycle trainer, characterized in that a closed loop of magnetic flux can be formed with the above-mentioned magnetic body portion behind the bicycle. 3. The bicycle trainer according to claim 2, wherein the rotating body has a substantially drum shape with a smooth concave groove around which a wheel of the bicycle fits and contacts. Yes, a bicycle trainer. 4. The bicycle trainer according to claim 3, wherein the rotating body is made of aluminum, and the iron plate is attached to the side surface of the rotating body so that the magnetic body portion is further laminated on the magnetic body portion. A bicycle trainer, which is characterized in that a non-magnetic material conductive portion is formed.