JPS59160765A - Speedometer sensor for bicycle - Google Patents

Abstract

PURPOSE:To measure speed electrically and accurately and to enhance durability by providing a freely rotatable large gear on the hub of a wheel and transmitting rotation of the large gear to a generator through a small gear. CONSTITUTION:The large gear 9 provided on the hub of a wheel is rotated by running of the bicycle through a projection 12 engaged with the spoke of front wheel of the bicycle. Many holes 11 that mesh with a small gear 10 are provided on the outer periphery of the large gear 9. Accordingly, rotation of the large gear 9 is transmitted to the small gear 10, and a magnet 18 is rotated by rotation of the small gear 10. The generator consists of the magnet 18, a four-pole stator 21, a coil 24 and a cover 25, and the output is supplied to an indicator.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a bicycle speedometer sensor.

Structure of the conventional example and its problems A conventional bicycle speedometer had a structure as shown in FIGS. 5 and 6. That is, 31 is a large gear that has a hole 33 on its outer periphery that engages with a small gear 32, and this large gear 31 is connected to the running of the bicycle via a projection 34 that engages with a spoke part (not shown) of the front wheel of the bicycle. It rotates accordingly. Also large gear 3
1 is rotatably held by holding members 36, 36 arranged on both sides thereof, and the holding members 35, 36 and the dog gear 31 are set at the center of the front wheel of the bicycle.

Reference numeral 37 denotes a flange portion provided at the upper end of the retainer portion 36, and this flange portion 37 is provided with a through hole 39 through which the rotating shaft 38 of the small gear 320 passes. Reference numeral 4Q denotes a mounting portion inserted and fixed into the through hole 39, and a threaded portion 41 is provided on the outer periphery of the mounting portion 40.

42 is a flexible shaft, and this flexible shaft 42 has an inner wire 43. Outerch, -bu 4
47 bag nuts 45, and the small gear 32
The connection is made by inserting the square shaft 46 provided at one end of the inner wire 43 into the square hole 47 provided in the rotating shaft 38 of the small gear 32, and then inserting the cap nut 46 into the threaded portion 41 of the mounting portion 40. By screwing into the holding member 36
It is fixed at Reference numeral 48 denotes an eddy current type speed display section, and the speed display section 48 is adapted to read the speed using a pointer 49, and is connected to the flexible shaft 42 through a corner provided at the other end of the inner wire 43. axis 60
This is done by inserting it into the rotating part 61 of the speed display part 48. Reference numeral 52 denotes a metal fitting for attaching the speed display section 48 to the handlebar of the bicycle.

In the above configuration, the rotation of the large gear 31 that is rotationally driven by the rotation of the front wheel of the bicycle is transmitted to the rotating part 61 of the speed display section 48 via the small gear 32° inner wire 43, and the rotation of the large gear 31 is transmitted to the rotating section 61 of the speed display section 48. The device swings according to the speed of the bicycle.

However, in the above conventional configuration, the large gear 31
Since the rotation of the bicycle is transmitted to the speed display section 48 via the flexible shaft 42, the length of the flexible shaft 42 does not match the body of the bicycle, so a long flexible shaft 42 is used. As a result, the flexible shaft 42
There have been problems in that the inner wire 43 forming the flexible shaft 42 may bend or bend in the middle, resulting in uneven rotation, or the inner wire 43 forming the flexible shaft 42 may break midway.

The present invention solves the above-mentioned conventional problems, and does not have the problem of uneven rotation as in the conventional case, and is very advantageous even when an electric display such as a light emitting diode is used in the speed display section. The purpose is to provide a speedometer sensor for bicycles.

Structure of the Invention In order to achieve the above object, the present invention provides a power generation system connected to a large gear rotatably attached to the hub portion of a bicycle wheel and rotated by 19 rotations of the wheel, and a small gear that meshes with the large gear. According to this configuration, the rotation of the large gear drives the generator via the small gear, and the output voltage of this generator is converted to a converter.

When transmitting data to the amplifying circuit, the desired purpose can be achieved simply by connecting the two with an IJ-wire.As a result, the flexible shaft does not bend in the middle as in the past. There is no problem of uneven rotation, and since the speed sazer is electrical, it is very advantageous when using an electrical display such as a light emitting diode on the speed display section.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall circuit diagram of a speedometer using the sensor of the present invention, where 1 is the sensor of the present invention, 2 is a comparator,
The amplifying circuit section 3 is a display section consisting of a plurality of light emitting diodes, and this display section 3 reads the speed of the bicycle based on the number and position of the light emitting diodes.

Figure 2 shows how the sensor of the present invention is attached to the hub part of the front wheel of the bicycle, where 4 is the front wheel of the bicycle, 5 is the spoke of the front wheel 4, 6 is the front fork of the bicycle, and 7 is a vinyl resin. This lead wire 7 is made of a coated copper wire, and is used to connect the sensor 1 attached to the knob 8 of the front wheel 4 of the bicycle, the comparator, and the amplification circuit section 2.

Although the speed display section 3 is not shown, it is attached to a location where it can be easily seen, such as on the handlebar of the bicycle.

Figures 3 and 4 show the specific structure of the sensor of the present invention, and reference numeral 9 denotes a hole 1 on the outer periphery that engages with the small gear 1o.
This large gear 9 is provided with a large number of gears 1 and 9, and rotates as the bicycle travels via protrusions 12 that engage spokes 6 of the front wheel 4 of the bicycle.

Further, the large gear 9 has holding members 13.1 arranged on both sides thereof.
4, and is rotatably held by this holding member 13.
14 and the dog gear 9 are set in the knob portion 8 of the front wheel 4 of the bicycle. Reference numeral 16 denotes a flange portion provided at the upper end of the holding member 13, and a bearing 16 is press-fitted into this flange portion 15. Reference numeral 17 denotes a rotating shaft to which a magnet 1B is fixed by adhesive or the like, and this rotating shaft 17 passes through the inside of the bearing 16, and a small gear 10 is disposed at its lower part.
The small gear 1o is held by the small gear 1o. Still small gear 10
The power transmission from the rotating shaft 1γ to the rotating shaft 1γ is prevented from rotating by the notch 20 formed at the bottom of the rotating shaft 17.
It will definitely be done. 21 is a 4-pole stator corresponding to the magnet 18, and this 4-pole stator 21 is connected to the poles 22 and 23.
This constitutes a generator that generates voltage in the coil 24 by the rotation of the magnet 18 corresponding to the lead wire 7.
A voltage signal corresponding to the speed of the bicycle is transmitted to the comparator/amplifier 11] circuit section 2. Reference numeral 25 denotes a cover having a flange portion 26, and the cover 25 has the flange portion 26 in close contact with the flange portion 15 of the holding member 13, and the two are caulked and fixed with rivets 27.

In the above embodiment, an alternating current generator is used as the sensor, but a direct current generator may also be used.Although in the above embodiment, the speed was detected using the voltage generated by the generator, it is also possible to use the frequency. It goes without saying that you can.

Effects of the invention In general, in order to obtain an output voltage that corresponds to the speed of the bicycle,
A small generator can be considered, but one for bicycle headlights is
The Kame machine rotates a magnet using a roller that is in contact with a tire. However, in a generator with this structure, for example, when the speed of the bicycle is 16 km/h, the rotation of the magnet is about 4
QOOrpm, and as a result, even if it is used only when the lights are on at night, in a speedometer that is used all the time like the speedometer of the present invention, there are many problems such as the durability of the bearing part and the load of tire contact pressure. However, in the present invention, the large gear constituting the bicycle speedometer sensor is rotatably attached to the hub portion of the bicycle wheel, and the rotation of the large gear drives the generator via the small gear. For,
The above-mentioned tire contact pressure load 9 rotation noise is excluded, and the rotation speed of the generator magnet is 1 s km/
Since the rotation speed is as low as approximately 35 rpm, there are no problems with durability or noise, and long-term durability can be achieved. Furthermore, the generator can be easily attached to the bicycle without requiring a separate pressure spring or mounting hardware.

Furthermore, in the present invention, since the generator is driven by the rotation of the large gear via the small gear, the output voltage of this generator is measured by a comparator.

[Addition 1] When transmitting data to the circuit section, the desired purpose can be achieved simply by connecting the two with a lead wire, and as a result, the rotation of the large gear can be transmitted via a flexible shaft as in the past. Unlike those that transmit data to the speed display, there is no problem of uneven rotation caused by bending the flexible shaft in the middle, and since the speed sensor is electric, there is no need to use an electric light emitting diode or other device in the speed display. It is also very advantageous when displaying information, and has various excellent effects such as easy product development such as sounding an alarm buzzer etc. when the speed exceeds a certain speed.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a speedometer using a sensor according to an embodiment of the present invention, FIG. 2 is a diagram showing the sensor attached to the front wheel of a bicycle, and FIG. 3 is a front view of the sensor.
FIG. 4 is an exploded perspective view of the components of the same sensor, FIG. 6 is an exploded perspective view of the components of a speedometer using a conventional sensor, and FIG. 6 is an exploded perspective view of the components of the sensor. 8...Hub part, 9...Large gear, 1o.
...Small gear, 18.21.24... Generator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4, Figure 5, Figure 6 I

Claims (1)

[Claims] A bicycle speedometer sensor is composed of a large gear rotatably attached to the knob of a bicycle wheel and rotated by the rotation of the wheel, and a generator connected to a small gear that meshes with the large gear.