JP2011121529A - Overturning sensor for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily improve production efficiency in an overturning sensor for a vehicle, and to expand a degree of freedom of design of the sensor without limiting the range of a place for arranging magnet parts. <P>SOLUTION: This overturning sensor for the vehicle includes a casing installed in the vehicle, a pendulum 4 rockably arranged in this casing via a rocking shaft 41, the magnet parts N and S arranged in this pendulum, a printed circuit board arranged in the casing and a magnetic sensor arranged on this printed circuit board, and outputs a predetermined signal by the existence of magnetism of the magnet parts received to the magnetic sensor in response to a rocking angle of the pendulum. The magnet parts of the pendulum are formed of partial magnetization. Thus, labor is not required when arranging thee magnet parts in the pendulum, and since there is no need to form a through-hole or a recessed part in the pendulum as usual, the range of the place for arranging the magnet parts is hardly limited. When using this vehicular overturning sensor, the production efficiency of the sensor is easily improved, and since the range of the place for arranging the magnetic parts is hardly limited, an installation position such as the magnetic sensor is neither limited, and as a result of this, the degree of freedom of design of the sensor is expanded. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle overturn sensor, which is installed in a motorcycle, a tricycle or the like, and is used when detecting the overturn of these vehicles, for example, for controlling an engine or the like.

    This type of conventional vehicle overturn sensor includes a casing attached to the vehicle, a pendulum installed in the casing so as to be swingable via a swing shaft, a magnet portion provided on the pendulum, and the casing. A magnet having a printed circuit board installed therein and a magnetic sensor (Hall element) installed on the printed circuit board, the magnet unit receiving the magnetic sensor (Hall element) according to the swing angle of the pendulum To output a predetermined signal to control the engine.

Japanese Utility Model Publication 63-10487

  However, in such a conventional vehicle fall sensor, when the pendulum is provided with a magnet part, a pendulum is formed with a through hole or a concave part, and a magnet body is fitted into the through hole or the concave part, or a pendulum is formed. Since it was insert-molded at the time, it took time to install the magnet part, and as a result, it was difficult to improve the production efficiency. As a result, the installation position of the magnetic sensor or the like is also restricted, so that the degree of freedom in designing the vehicle fall sensor has to be narrowed.

  An object of the present invention is to eliminate this inconvenience.

  In order to eliminate the inconvenience, in the vehicle fall sensor according to the present invention, a casing attached to the vehicle, a pendulum installed in the casing so as to be swingable via a swing shaft, and the pendulum are provided. A magnet unit, a printed circuit board installed in the casing, and a magnetic sensor installed in the printed circuit board, and whether the magnet unit receives magnetism according to a swing angle of the pendulum In the vehicle overturn sensor that outputs a predetermined signal, the magnet portion of the pendulum is formed by partial magnetization.

  Protrusions that protrude upward are provided at both ends of the pendulum, and one magnetic pole is magnetized at the tip of one side of the protrusion, and the lower end of the pendulum is located near the bottom of the one magnetic pole. A magnetic pole portion opposite to the one magnetic pole portion can be magnetized on the peripheral surface up to the vicinity.

  Further, in this case, the inner peripheral surface of the bearing of the swing shaft can be formed into a polygonal shape.

    Since the vehicle overturn sensor according to the present invention is configured as described above, that is, a casing attached to the vehicle, a pendulum installed in the casing so as to be swingable via a swing shaft, and the pendulum. A magnet part provided in the casing, a printed circuit board installed in the casing, and a magnetic sensor installed in the printed circuit board, and the magnet part receives a magnetism according to a swing angle of the pendulum. In the vehicle fall sensor that outputs a predetermined signal depending on the presence or absence of the magnet, since the magnet part of the pendulum is formed by partial magnetization, it does not take time to install the magnet part on the pendulum, Since it is not necessary to form a through hole or a recess, the range of the place where the magnet portion is provided is not easily limited.

  Therefore, if this vehicle fall sensor is used, it is easy to improve the production efficiency of the sensor, and since the range of the location where the magnet part is provided is not limited, the installation position of the magnetic sensor or the like is not easily restricted. The degree of freedom in designing the sensor is widening.

  Protrusions that protrude upward are provided at both ends of the pendulum, and one magnetic pole is magnetized at the tip of one side of the protrusion, and the lower end of the pendulum is located near the bottom of the one magnetic pole. If the magnetic pole part opposite to the one magnetic pole part is magnetized on the peripheral surface up to the vicinity, an effect that the magnetizing range can be easily secured while maintaining the moment of inertia can be achieved.

  Further, in this case, if the inner peripheral surface of the bearing of the swing shaft is made into a polygonal shape, the contact surface between the swing shaft and the bearing becomes point contact, so that the slidability is improved and the bearing surface is deteriorated with time. Can be reduced.

  A vehicle overturn sensor according to the present invention includes a casing attached to the vehicle, a pendulum installed in the casing so as to be swingable via a swing shaft, a magnet portion provided in the pendulum, and the casing. And a magnetic sensor (Hall element) installed on the printed circuit board, and depending on the presence or absence of magnetism of the magnet portion received by the magnetic sensor (Hall element) according to the swing angle of the pendulum In the vehicle overturn sensor that outputs a predetermined signal, a projecting portion projecting upward is provided at both ends of the pendulum, and one magnetic pole is magnetized at one end of the projecting portion, and the one in the pendulum A magnetic pole opposite to the one magnetic pole is magnetized on the peripheral surface from the lower part of the magnetic pole to the vicinity of the lower end, and the inner peripheral surface of the bearing of the swing shaft is polygonal. With the most major features in it that.

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

FIG. 1 is a diagram showing the state of use of the vehicle fall sensor, FIG. 2 is a front view thereof, FIG. 3 is a perspective view thereof, FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 6 is a perspective view taken along arrow VI in FIG. 4, and FIG. 7 is an explanatory view of a magnetized portion in the pendulum.

  In FIG. 1, 10 is a scooter (corresponding to "vehicle" in the present invention), 11 is its vehicle body, 12 is a front fork, 13 is a front wheel, and 14 is a steering handle. A is a vehicle overturn sensor, which is installed above the front fork 12 in the vehicle body 10.

  Next, the vehicle overturn sensor A will be described with reference to FIGS.

  In the figure, 2 is a resin casing, which has a bottomed cylindrical shape. A rubber holder 21 is wound around the casing 2. Due to the elasticity of the rubber holder 21, the vehicle fall sensor A is held on the vehicle body 11 in a vibration-proof state.

  4 and 5, reference numeral 3 denotes a spacer, which is fixed in a state of being fitted from the opening 23 of the casing 2. The spacer 3 is made of resin, and is used to attach necessary parts to the vehicle fall sensor A in the casing 2.

  Reference numerals 31 and 31 denote support pieces which are integrally projected at both ends of the spacer 3. The support pieces 31, 31 extend in the bottom direction of the casing 2. Reference numerals 32 and 32 denote bearing holes, which are formed at the tips of the support pieces 31 and 31. These bearing holes 32 and 32 have an octagonal inner periphery and are opposed to each other (see FIG. 6).

  Reference numeral 41 denotes a resin-made rocking shaft, which is bridged so as to be rockable in a state where both end portions are fitted in the bearing holes 32, 32 of the support pieces 31, 31. When both ends of the swing shaft 41 are fitted into the bearing holes 32, 32, the support pieces 31, 31 are fitted while being expanded outwardly against elasticity. Reference numeral 4 denotes a ferrite pendulum, which is fitted in a suspended state in the middle (longitudinal direction) of the swing shaft 41. The pendulum 4 has a substantially semi-disc shape, and the swing shaft 41 is located at the center thereof. For this reason, the pendulum 4 oscillates in the range of about 45 degrees to the left and right around the oscillating shaft 41 by its weight.

  Reference numerals 43 and 43 denote projecting portions which are integrally projected upward at both ends of the pendulum 4. These protrusions 43 and 43 are line targets via the center, and balance the pendulum 4. As shown in FIG. 7, N is an N-pole magnet portion, and is magnetized on one of the protruding portions 43 (right side in FIG. 7). S is an S-pole magnet part, and is magnetized on the peripheral surface of the pendulum 4 from near the lower part to the lower end part of the N-magnet magnet part. A normal method is used for magnetization.

  Reference numerals 45 and 45 denote resin weights, which are suspended from the swing shaft 41 while being attached to both sides of the pendulum 4. By these weight portions 45, 45, the position of the center of gravity of the pendulum 4 is shifted downward, and the moment of inertia is strengthened.

    Next, 5 is a printed circuit board, which is fixed to the spacer 3. The printed circuit board 5 is located between the support pieces 31 and 31. Reference numeral 51 denotes a Hall element (corresponding to the “magnetic sensor” of the present invention), which is fixed to the surface of the printed circuit board 5. The Hall element 51 is opposed to the swinging circumferential surface of the magnet parts N and S of the pendulum 4.

  Reference numerals 61, 62, and 63 denote three terminals, which penetrate the spacer 3. These terminals 61, 62, 63 extend from the printed board 5 to the opening 23 of the casing 2 and protrude.

  71 is an annular seal portion made of rubber and is fitted around the inside of the opening 23 of the casing 2. Reference numeral 72 denotes an annular middle cap that is fitted around the inside of the opening of the casing 2 to prevent the seal portion 71 from falling off.

    This vehicle overturn sensor A is assembled as follows.

  First, the Hall element 51 and the three terminals 61, 62, 63 are assembled to the printed board 5 and fixed to the spacer 3. Thereafter, the pendulum 4 is assembled to the support pieces 31, 31. In this state, the spacer 3 is fitted into the casing 2 from the opening 23, the annular seal portion 71 is fitted, and then the middle cap 72 is fitted.

    In the vehicle fall sensor A, in a normal state where the vehicle body does not fall, the pendulum 4 is in the position shown in FIGS. 5 and 7, and the magnet portions N and S face the hall element 51 of the printed circuit board 5. The Hall element 51 is turned on (or turned off) by the magnetism of the magnet parts N and S, a non-falling signal is output through the terminals 61, 62, and 63, and the engine switch is turned on.

    On the other hand, when the vehicle body falls, the pendulum 4 swings due to the inclination of the vehicle body, and the magnet portions N and S do not face the hall element 51. As a result, the Hall element 51 is not subjected to the magnetism of the magnet parts N and S, is turned off (or turned on), a fall signal is output via the terminals 61, 62 and 63, and the engine switch is in the OF state. It becomes. That is, according to the swinging of the pendulum 4, the Hall element 51 is turned on / off and a non-falling signal or a falling signal is output via the terminals 61, 62, 63.

    In this embodiment, the Hall element is used as the magnetic sensor. However, the present invention is not limited to this, and all the elements corresponding to the magnetic sensor are included.

  This invention facilitates the installation of the magnet part to improve the production efficiency of the sensor, and improves the flexibility of the range of the place where the magnet part is provided and the installation position of the magnetic sensor (Hall element), This can be used to increase the degree of freedom in designing the sensor.

  The invention of claim 2 can be used when only the magnetization range is changed with the moment of inertia unchanged.

  Furthermore, this sensor can be used for improving the slidability of the swing shaft and reducing deterioration with time on the bearing surface.

FIG. 1 is a diagram showing the state of use of the vehicle overturn sensor. FIG. 2 is a front view of the same. FIG. 3 is a perspective view of the same. 4 is a cross-sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a perspective view taken along arrow VI in FIG. FIG. 7 is an explanatory diagram of a magnetized portion in the pendulum.

A ... Vehicle overturn sensor N ... N pole magnet part S ... S pole magnet part
10… Scooter (vehicle)
11… Body
12… Front fork
13… Front wheel
14… Steering handle 2… Resin casing
21… Rubber holder
23… Opening 3… Spacer
31… Support piece
32… Bearing hole 4… Pendulum
41… Oscillating shaft
43… Projection
45 ... Weight 5 ... Printed circuit board
51… Hall element (magnetic sensor)
61,62,63… terminals
71… Annular seal
72… Medium cap

Claims (3)

A casing attached to the vehicle, a pendulum installed in the casing so as to be swingable via a swing shaft, a magnet portion provided in the pendulum, a printed circuit board installed in the casing, and the print A vehicular fall sensor that outputs a predetermined signal according to the presence or absence of magnetism of the magnet unit received by the magnetic sensor in accordance with a swing angle of the pendulum. A vehicle fall sensor characterized by being formed by partial magnetization. Protrusions projecting upward are provided at both ends of the pendulum, and one magnetic pole is magnetized at the tip of one side of the projecting part, and from near the bottom of the one magnetic pole to the vicinity of the lower end of the pendulum 2. The vehicle overturn sensor according to claim 1, wherein a magnetic pole portion opposite to the one magnetic pole portion is magnetized on a peripheral surface of the vehicle. 3. The vehicle overturn sensor according to claim 1, wherein an inner peripheral surface of the bearing of the swing shaft is formed in a polygonal shape.

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