JPH06134046A - Fixed-type bicycle training apparatus - Google Patents

Abstract

PURPOSE:To obtain a small-sized and light, quiet and maintenance-free fixed- type bicycle training apparatus by attaching a worm wheel to a crankshaft and by providing a worm shaft intersecting perpendicularly to the crankshaft to engage with the worm wheel and a damping means for giving control to the rotation of the worm shaft. CONSTITUTION:A worm wheel 40 and worm shaft 41 engaging with the worm wheel are built in a gear box 4, and the worm wheel 40 is connected to a crankshaft 5 provided with a pedal via free wheel composed of a pawl and ratchet. Also, a load shaft 44 is connected to the lower end of the worm 41 extending below the gear box 4 and a brake-supporting plate equipped with a brake disc is secured to the load shaft 44 supported by a bearing on a leg frame 1. Further, one race of a ball bearing supporting the worm shaft 41 in the gear box 4 is provided with a load sensor and a damping device 6 is controlled by a controller 8 so that a load torque applied to a pedal takes a set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary bicycle training device for training pedaling motion.

[0002]

2. Description of the Related Art In the conventional load setting for pedal operation in this type, a gearbox consisting of a sprocket paired with a chain or a gear pair paired with a toothed belt is used to rotate a crankshaft provided with a pedal. In order to obtain a higher speed increasing ratio, the speed is increased over a plurality of stages.

[0003]

In this case, the space for arranging the members such as the chain and the sprocket becomes large, which makes it difficult to downsize the equipment and also increases the weight. Also, with chains and sprockets or toothed belts and gears, noise is generated at the meshing parts, which makes it difficult to use in quiet homes, and chains and toothed belts may stretch after long-term use. However, the load torque must be measured and the loader must be equipped with an idler pulley. In addition, it is difficult to measure the load torque.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stationary bicycle training apparatus which is small in size, lightweight, quiet, and maintenance-free. .

[0005]

SUMMARY OF THE INVENTION The present invention, therefore, is directed to a worm wheel mounted on a crankshaft, a worm shaft which is orthogonal to the crankshaft and meshes with the worm wheel, and braking means for braking rotation of the worm shaft. It is characterized by having and.

[0006]

According to the present invention, since the speed increasing ratio between the worm wheel and the worm shaft is extremely large and the rotating member having a large radius is only the worm wheel, the size and weight can be reduced. it can.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. A pair of columns 2 and 3 are erected from an X-shaped leg frame 1. Of the two columns 2 and 3 whose lengths are both variable by expansion and contraction, the column 2 has a handle 20 and a controller 8 at its upper end, and the column 3 has a saddle 30 at its upper end. And both columns 2,
In the part covered by the cover 9 on the leg frame 1 side between the three,
A gear box 4 fixed to a plate 90 spanned between the columns 2 and 3 is arranged.

The gear box 4 in this case has a worm wheel 40 and a worm shaft 41 meshing with the worm wheel 40 built therein. The worm wheel 40 has a pedal 50 via a free wheel 42 consisting of a claw and a ratchet wheel. It is connected to the provided crankshaft 5. In addition, a load shaft 44 is attached to the lower end of the worm shaft 41 extending below the gear box 4.
Are connected. A brake support plate 45 having a brake plate 60 is fixed to the load shaft 44 supported by the bearing 10 on the leg frame 1. The brake plate 60 here is formed of an electric conductor such as copper, and the braking device 6 is configured with the electromagnet 61 that positions the brake plate 60 in the gap. The braking by the braking device 9 uses an eddy current as described later, but may be a braking device that applies a braking force by physical contact, or may be another braking device. .

Further, the load sensor 4 formed of a strain gauge or the like is provided on one race of the ball bearing 46 supporting the worm shaft 41 in the gear box 4.
7 is provided. The load sensor 47 measures the thrust direction reaction force applied to the worm shaft 41 in a static state via the race. If the pedal 50 is depressed while sitting on the saddle 30, only one-way rotation is transmitted from the crankshaft 5 to the worm wheel 40 via the freewheel 42. The lead angle between the worm wheel 40 and the worm shaft 41 meshing with the worm wheel 40 is larger than the friction angle (when the friction coefficient between the worm wheel and the worm shaft is μ, the friction angle ψ is tan ⁻¹ μ). Because of the setting, the rotation of the worm wheel 40 is transmitted to the worm shaft 41, which is orthogonal to the crankshaft 5, at an increased speed. The speed increasing ratio N at this time is N = Z /, where Z is the number of teeth of the worm wheel 40 and n is the number of threads of the worm shaft 41.
n.

The load shaft 44 and the brake plate 60 rotate together with the worm shaft 41. Since the brake plate 60 is placed in the magnetic field of the electromagnet 61, eddy current is generated and the eddy current and the magnetic field are generated. Subject to electromagnetic braking. This braking force changes depending on the current supplied to the electromagnet 61 and the rotation speed of the brake plate 60. If the rotation speed of the brake plate 60 is constant, the braking force is proportional to the square of the current value supplied to the electromagnet 61. To do.

Here, the setting of the braking force by the braking device 6 can be performed by the controller 8, which thrust is applied to the worm shaft 41 obtained from the force sensor 47. The directional reaction force is monitored, and the value of the current flowing through the electromagnet 61 in the braking device 6 is controlled so that the load torque applied to the pedal reaches the set value. The feedback control of the load torque is performed in consideration of the temperature change and the loss change.

5 and 6 show the structure of the grounding portion of the leg frame 1. That is, in this structure, the leg frame 1 is X-shaped and has four ground contact portions, but the two ground contact portions located on one side have vertical directions as shown in FIG. A roller 17 is rotatably mounted on the outer circumference of a sleeve 16 fixed to the lower surface side of the leg frame 1 by a mounting shaft 15 of the leg frame 1, and the other two ground contact portions are adjusted in height as shown in FIG. A roller-shaped leg 19 with a shaft 18 is fixed.

When it is desired to move the training device,
As shown in FIG. 7, it suffices if the roller 17 side is in contact with the ground and the leg 19 side is tilted so as to float, and at this time,
The roller 17 can be smoothly moved by the rotation of the roller 17, and since the legs 19 need only be slightly floated, the angle of inclination can be small and the height of lifting the center of gravity can be small.

8 and 9 show another embodiment. This is one in which the saddle 30 can be moved up and down by the electric lifting device 7. The support column 3 is composed of a fixed pipe 31 and a lifting pipe 32, and the lower end of the lifting pipe 32 contained in the fixed pipe 31. Feed nut 75
The pipe 33 provided with is fixed. At the lower end of the fixed pipe 31, a screw shaft 73 to which a worm wheel 72 that meshes with a worm shaft 71 that is rotationally driven by a motor 70 is fixed is housed. The screw shaft 73 is screwed with the feed nut 75, and when the screw shaft 73 rotates, the feed nut whose movement in the rotation direction is restricted by the guide cylinder 74 housed in the fixed pipe 31. 75 moves up and down, and the lifting pipe 32 having the saddle 30 attached to the upper end also moves up and down accordingly.

The electric lifting device 7 is controlled by the rotation of the motor 70 by the controller 8. For this reason, the controller 8 is provided with a switch for vertically adjusting the saddle 70. In the controller 8, an operation mode for automatically raising and lowering the saddle 30 within a predetermined range while the pedal 50 is being exercised is incorporated. If the height of the saddle 30 changes while exercising, the muscles used to step on the pedal 50 change, so that more effective training can be performed.

The saddle 3 at the lower end of the fixed pipe 31
A load sensor 78 is provided on the base 77 which receives a load applied to 0 so that the weight of the user can be measured. Based on the measurement result, the braking force by the braking device 6 can be measured. By changing the settings, it is possible to automatically set the heavier load to a heavy person and the lighter load to a lighter person.

The saddle 30 is attached to the lift pipe 32 via a spring 34. This spring 34 formed of a U-shaped leaf spring has one horizontal piece attached to the upper end of the elevating pipe 32, and the saddle 30 slidably attached to the other horizontal piece.
The spring elasticity not only improves the sitting comfort, but also the posture and spring elasticity during exercise can be changed by changing the position of the saddle 30.

[0018]

As described above, according to the present invention, the worm wheel mounted on the crankshaft, the worm shaft which is orthogonal to the crankshaft and meshes with the worm wheel, and the braking means for braking the rotation of the worm shaft are provided. In addition, the speed increasing ratio between the worm wheel and the worm shaft is extremely large, and since the worm wheel is the only rotating member with a large radius, it is possible to set a high speed increasing ratio. It is possible to reduce the size and weight, and since the worm wheel and the worm shaft perform sliding transmission, there is less noise, and there is no problem with the elongation of the members such as when using a chain. Since it can be maintenance-free and the load measurement is easy, it is easy to deal with load torque control.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a perspective view of the same.

FIG. 3 is a perspective view showing a state in which the above cover is removed.

FIG. 4 is a partial sectional view of the above.

5A and 5B show a grounding portion, FIG. 5A is a sectional view, and FIG. 5B is an exploded perspective view.

6A and 6B show another grounding portion, in which FIG. 6A is a sectional view and FIG. 6B is an exploded perspective view.

FIG. 7 is a side view showing a moving operation.

FIG. 8 is a cross-sectional view of another embodiment.

FIG. 9 is a partial sectional view of the above.

[Explanation of Codes] 5 Crankshaft 6 Braking Device 40 Worm Wheel 41 Worm Shaft

Claims (5)

[Claims] 1. A worm wheel mounted on a crankshaft, a worm shaft orthogonal to the crankshaft and meshing with the worm wheel, and braking means for braking the rotation of the worm shaft. Fixed bicycle training device. 2. The fixed type according to claim 1, further comprising a reaction force measuring means for the worm shaft, wherein the braking means changes a braking force according to an output of the reaction force measuring means. Bicycle training equipment. 3. The fixed-type bicycle training apparatus according to claim 1, wherein the leg frame is provided with a roller rotatably supported by a vertical shaft on a ground contact portion of the leg frame. 4. The fixed-type bicycle training apparatus according to claim 1, further comprising electric lifting means for moving the saddle up and down. 5. A stationary bicycle training apparatus comprising: a measuring unit for measuring a load applied to the saddle, wherein the braking unit changes the braking force according to the output of the measuring unit.