JP2007178399A - Pendulum type sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive pendulum type sensor capable of improving the constitution of a bearing mechanism of a rotating shaft, reducing parts costs, and improving productivity. <P>SOLUTION: A first diameter part 33 of the rotating shaft 3a in which a third diameter part 31 is pressed-fit into and fixed to a pendulum 4 is pivoted at a radial bearing 24. The radial bearing 24 is pressed-fit into and fixed to a center part of a spiral spring 22 planarly formed in the rotating direction of the rotating shaft 3a. The spiral spring 22 is embedded and arranged in a frame 21. A stop mechanism 27 is arranged in such a way that it presses an outer circumferential part of the spiral spring 22 except its effective part and that the vicinity of a recession part of its center part is simultaneously close to a side surface of the bearing 24 on the side opposite to the side in which the rotating shaft 3a is inserted. The first diameter part 33 of the rotating shaft 3a is pivoted at the radial bearing 24, and an end part (a boundary to the first diameter part 33) of a second diameter part 32 is simultaneously arranged close to a curved recession part of the radial bearing 24 to stop deviating movements in a thrust direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pendulum type sensor.

  Conventionally, a pendulum sensor has been developed that detects the inclination of a moving body such as a vehicle, a ship, or an aircraft, or an industrial machine such as a robot or a machine tool. Various types of pendulum sensors have been developed. For example, a pendulum sensor including a magnet and a magnetic sensor has been put into practical use.

  As a pendulum type sensor for tilt detection provided with the magnet and the magnetic sensor described above, a housing, a bearing attached to the housing, a rotating shaft supported by the bearing, and attached to the rotating shaft, A pendulum body having magnetic flux generation means; and a magnetic sensor for detecting magnetic flux from the magnetic flux generation means, wherein the magnetic sensor is provided above the rotation shaft, and the magnetic flux generation means is provided at the center of gravity of the pendulum body. The thing of the structure provided more upward is disclosed. (For example, refer to Patent Document 1.)

  FIG. 6 is a side sectional view of a pendulum type sensor according to the prior art, and FIG. 7 is a side sectional view of a bearing mechanism of the pendulum type sensor according to the prior art. The casings 1a and 1b are assembled so that their outer shapes coincide with each other in a form facing each other. A bearing mechanism 2 is mounted on the casings 1a and 1b, and supports the rotating shaft 3. A pendulum body 4 on which a magnetic flux generating means (not shown) is mounted is fixed to the rotary shaft 3 by press-fitting, and the pendulum body 4 is disposed in a state where it is hung down by gravity (no load other than gravity). The The magnetic sensor 5 for detecting the magnetic flux from the magnetic flux generating means (not shown) is disposed at an appropriate position where the magnetic flux can be easily detected at a predetermined position above the casings 1a and 1b.

  The downward direction of FIG. 6 is the gravitational direction, the pendulum body 4 is constant in the gravitational direction and does not change its orientation, and when the pendulum type sensor, that is, the casings 1a and 1b is tilted (relative to the direction perpendicular to the page), the casing 1a and The position of the magnetic sensor 5 for detecting the magnetic flux arranged at a predetermined position above 1b is changed, and apparently it has the same effect as the swinging of the pendulum body 4, and the magnetic sensor 5 detects the change of the magnetic flux and detects the tilt angle. Can be detected. Thus, when the pendulum sensor tilts in an arbitrary direction, not only the tilt can be detected, but also when a force such as an impact acts on the pendulum sensor, the pendulum body 4 swings, Force can be determined.

The rotary shaft 3 shown in FIG. 7 is press-fitted and fixed to a pendulum body 4 (not shown in FIG. 7), and the tip of the rotary shaft 3 is pivotally supported by a radial bearing 24. The radial bearing 24 is press-fitted and fixed at the center of a spiral spring 22 formed in a plane in the rotational direction of the rotary shaft 3, and the spiral spring 22 is embedded in the cavities 21. The spring retainer 25 presses the outer periphery of the spiral spring 22 outside the effective portion of the spiral spring, and at the same time, the vicinity of the concave portion at the center is disposed close to the side surface opposite to the side where the rotary shaft 3 of the radial bearing 24 is inserted. Has been. Further, the spring 21 is fixed at a low pressure so as to be buried in the inner portion of the flange 21 by the spring force of the retaining ring 26 arranged so as to cover the return portion of the flange 21 near the flange. A thrust bearing 23 is press-fitted and fixed to the spring retainer 25 and is in contact with the tip of the rotating shaft 3.
JP 2005-83957 A

  The conventional pendulum type sensor requires a radial bearing 24 and a thrust bearing 23 as a bearing mechanism for the rotating shaft 3. Since each of the bearings is in contact with the rotary shaft 3, a member such as an artificial ruby having excellent wear resistance is selected and used. However, since it is expensive, it is very disadvantageous in terms of the cost of the product.

  Further, since the bearing mechanism for the rotary shaft 3 has two parts, that is, a radial bearing 24 and a thrust bearing 23, the number of parts is increased, resulting in an increase in part cost and an increase in production man-hours.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention aims to provide an inexpensive pendulum type sensor in which the structure of a bearing mechanism for a rotating shaft is improved, and the cost of parts is reduced and the productivity is improved.

  At least a housing, a bearing attached to the housing, a rotating shaft supported by the bearing, a stop mechanism that is movable in the axial direction of the rotating shaft, and a magnetic flux attached to the rotating shaft A pendulum type sensor comprising a pendulum body having a generating means and a magnetic sensor for detecting a magnetic flux from the magnetic flux generating means, wherein the rotating shaft is supported by a first diameter portion supported by the bearing; The pendulum type sensor is composed of a second diameter portion having an end portion that becomes an axially movable stopper against the bearing side surface portion, a pendulum body having the magnetic flux generating means, and a third diameter portion that is press-fitted and fixed.

  The third diameter portion is a pendulum type sensor that is thicker than the first diameter portion.

  A pendulum type sensor in which the second diameter portion of the rotating shaft and the third diameter portion of the rotating shaft have the same diameter is used.

  The bearing is curved in a concave shape when viewed from a direction in which the second diameter portion of the rotating shaft hits a side surface portion where the second diameter portion of the rotating shaft comes into contact with the movable stopper in the axial direction, and the curvature A pendulum type sensor is formed by disposing a stop mechanism for axial movement on the opposite side of the shape.

  The bearing is curved in a convex shape when viewed from the direction in which the second diameter portion of the rotating shaft hits the side surface portion where the second diameter portion of the rotating shaft hits and becomes a movable stop in the axial direction, and the curvature A pendulum type sensor is formed by disposing a stop mechanism for axial movement on the opposite side of the shape.

  The stopping mechanism for the axial movement of the rotating shaft is a pendulum type sensor having a structure that does not contact the tip of the rotating shaft.

  According to the present invention, a bearing structure comprising a first diameter portion supported by the bearing and a second diameter portion having an end portion that serves as an axially movable stopper against the bearing side surface portion, A bearing part that has to be configured with an expensive member by supporting the diameter part to serve as a radial bearing and having a bearing function in the thrust direction as compared with the structure in which the end of the second diameter part corresponds to the side surface part of the bearing. One can be configured. Therefore, the part cost can be reduced.

  In addition, the side surface of the bearing, which corresponds to the end of the second diameter portion, is concave or convex to reduce the axial frictional resistance of the bearing. With this configuration, the pendulum body fixed to the shaft swings. This makes it possible to obtain a highly sensitive pendulum type sensor that can detect a minute angle.

  In addition, the configuration in which the second diameter portion and the third diameter portion of the rotating shaft have the same diameter facilitates the processing of the rotating shaft and can reduce the cost at the time of component processing.

  In addition, the stop mechanism arranged on the opposite side of the bearing through the rotating shaft of the bearing is configured such that the tip of the first diameter portion of the rotating shaft through which the bearing is inserted does not come into contact therewith, thereby generating (increasing) axial resistance. The structure is designed so as not to let it go.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 is a side sectional view showing a pendulum type sensor according to a first embodiment of the present invention. The casings 1a and 1b are assembled so that their outer shapes coincide with each other in a form facing each other. A bearing mechanism 2 is mounted on the casings 1a and 1b, and supports the rotating shaft 3a. A pendulum body 4 on which magnetic flux generating means (not shown) is mounted is fixed to the rotating shaft 3a by press-fitting, and the pendulum body 4 is disposed in a state where the pendulum body 4 hangs down due to gravity (when there is no load other than gravity). The The magnetic sensor 5 for detecting the magnetic flux from the magnetic flux generation means (not shown) is appropriately disposed at a predetermined position of the housings 1a and 1b so as to easily detect the magnetic flux.

  The downward direction of FIG. 1 is the gravitational direction, the pendulum body 4 is constant in the gravitational direction and does not change its direction, and when the pendulum type sensor, that is, the casings 1a and 1b is tilted (relative to the direction perpendicular to the page), the casing 1a and The position of the magnetic sensor 5 for detecting the magnetic flux arranged at the predetermined position 1b changes, and apparently acts like the pendulum body 4 swings, and the magnetic sensor 5 detects the change of the magnetic flux and detects the tilt angle. it can. Thus, when the pendulum sensor tilts in an arbitrary direction, not only the tilt can be detected, but also when a force such as an impact acts on the pendulum sensor, the pendulum body 4 swings, Force can be determined.

  FIG. 2 is a side sectional view of a bearing mechanism used in the pendulum type sensor according to the first embodiment of the present invention, and FIG. 3 is a partially enlarged view of the rotating shaft used in the pendulum type sensor of the present invention shown in FIG. It is. The first diameter portion 33 of the rotary shaft 3a in which the third diameter portion 31 is press-fitted and fixed to the pendulum body 4 is pivotally supported by a radial bearing 24. The radial bearing 24 is formed in a plane in the rotational direction of the rotary shaft 3a. The spiral spring 22 is press-fitted and fixed to the center of the spiral spring 22, and the spiral spring 22 is embedded in the cavities 21.

  The stop mechanism 27 presses the outer peripheral portion of the spiral spring 22 outside the effective portion of the spiral spring, and at the same time, the vicinity of the concave portion in the central portion is disposed close to the side surface opposite to the side through which the rotation shaft 3a of the bearing 24 is inserted. ing. The first diameter portion 33 of the rotating shaft 3 a is configured to be disposed in the recess of the stop mechanism 27, but does not contact the stop mechanism 27. Further, the stop mechanism 27 is fixed at a low pressure so as to be embedded in the inside of the back 21 by the spring force of the stop ring 26 arranged so as to be applied to the return portion near the flange of the back 21.

  Here, the first diameter portion 33 of the rotary shaft 3 a is pivotally supported by the radial bearing 24, and at the same time, the end portion of the second diameter portion 32 (the boundary with the first diameter portion 33) is the radial bearing 24. It is placed close to the curved recess and is movable against the displacement in the thrust direction. This is because when a thrust force is applied in the radial bearing 24 direction from the rotary shaft 3a, the end of the second diameter portion 32 hits the curved concave portion of the radial bearing 24 and the opposite surface of the radial concave portion of the radial bearing 24. Is established by being arranged close to each other so as to hit the stop mechanism 27. By adding the thrust bearing function to the radial bearing 24 by using the bearing mechanism 2 as described above, it is possible to reduce the number of parts because a separate and separate thrust bearing is not required, and the cost can be reduced.

  4 is a side sectional view of the bearing mechanism used in the pendulum type sensor according to the second embodiment of the present invention, and FIG. 5 is a partially enlarged view of the rotating shaft used in the pendulum type sensor of the present invention shown in FIG. It is. The rotating shaft 3b includes a first diameter portion 33, a second diameter portion having the same outer diameter, and a third diameter portion (hereinafter referred to as a second diameter portion 35 because of the same outer diameter). The first diameter portion 33 of the rotary shaft 3b in which the second diameter portion 35 is press-fitted and fixed to the pendulum body 4 is supported by a radial bearing 28, and the radial bearing 28 is formed in a plane in the rotational direction of the rotary shaft 3b. The spiral spring 22 is press-fitted and fixed in the center of the spiral spring 22, and the spiral spring 22 is embedded in the cavities 21.

  The stopping mechanism 27 presses the outer peripheral portion of the spiral spring 22 outside the effective portion of the spiral spring, and at the same time, the vicinity of the concave portion in the center portion is disposed close to the side surface of the bearing 28 opposite to the side through which the rotating shaft 3b is inserted. ing. Further, the stop mechanism 27 is fixed at a low pressure so as to be embedded in the inside of the back 21 by the spring force of the stop ring 26 arranged so as to be applied to the return portion near the flange of the back 21.

  Here, the first diameter portion 33 of the rotating shaft 3 b is pivotally supported by the radial bearing 28, and at the same time, the end portion of the second diameter portion 35 (the boundary with the first diameter portion 33) is the radial bearing 28. It is placed close to the curved convex portion and is movable against the displacement in the thrust direction. This is because, when a thrust force is applied from the rotary shaft 3b to the radial bearing 28, the end of the second diameter portion 35 is a curved convex portion of the radial bearing 28, and the curved convex portion of the radial bearing 28 It is established by being arranged close to each other so that the opposite surface hits the stop mechanism 27. By adding a thrust bearing function to the radial bearing 28 by such a bearing mechanism 2, it is possible to reduce the number of parts because a thrust bearing is unnecessary and the cost can be reduced.

  In FIG. 2, the end of the second diameter portion 32 is disposed close to the curved concave portion of the radial bearing 24 and becomes a movable stopper against the displacement in the thrust direction. It is necessary to consider the resistance when it comes into contact with a movable stopper against a deviation in direction, and when the end comes into contact with a curved recess, only the edge of the end does not touch the surface, and the frictional resistance can be reduced. Similarly, in FIG. 4, even when the end of the second diameter portion 35 corresponds to a curved convex portion of the radial bearing 28, the frictional resistance can be further reduced per surface. Further, the reason why the central portion of the stop mechanism 27 is recessed is that the tip end portion of the first diameter portion 33 of the rotating shafts 3a and 3b is in contact and does not generate frictional resistance.

The sectional view of the side showing the pendulum type sensor of the present invention. Example 1 Side surface sectional drawing of the bearing mechanism used with the pendulum type sensor of this invention. Example 1 The elements on larger scale of the rotating shaft used with the pendulum type sensor of this invention. Example 1 Side surface sectional drawing of the bearing mechanism used with the pendulum type sensor of this invention. (Example 2) The elements on larger scale of the rotating shaft used with the pendulum type sensor of this invention. (Example 2) Side surface sectional drawing of the pendulum type sensor by a prior art. Side surface sectional drawing of the bearing mechanism of the pendulum type sensor by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Case 1b Case 2 Bearing mechanism 3 Rotating shaft 3a Rotating shaft 3b Rotating shaft 4 Pendulum body 5 Magnetic sensor 21 Wax 22 Spiral spring 23 Thrust bearing 24 Radial bearing 25 Spring retainer 26 Retaining ring 27 Retaining mechanism 28 Radial bearing 31 Third bearing Diameter portion 32 second diameter portion 33 first diameter portion 35 portion where the second diameter portion and the third diameter portion have the same diameter

Claims (6)

At least a housing, a bearing attached to the housing, a rotating shaft supported by the bearing, a stop mechanism that is movable in the axial direction of the rotating shaft, and a magnetic flux attached to the rotating shaft A pendulum sensor comprising a pendulum body having a generating means and a magnetic sensor for detecting a magnetic flux from the magnetic flux generating means,
The rotating shaft includes a first diameter portion that is supported by the bearing, a second diameter portion having an end portion that contacts the bearing side surface portion and serves as an axially movable stopper, and a pendulum body that includes the magnetic flux generation means. And a third diameter portion to be press-fitted and fixed.   The pendulum sensor according to claim 1, wherein the third diameter portion is thicker than the first diameter portion.   The pendulum sensor according to claim 1 or 2, wherein the second diameter portion of the rotating shaft and the third diameter portion of the rotating shaft have the same diameter.   The bearing is curved in a concave shape when viewed from a direction in which the second diameter portion of the rotating shaft hits a side surface portion where the second diameter portion of the rotating shaft comes into contact with the movable stopper in the axial direction, and the curvature 4. A pendulum sensor according to claim 1, wherein a stop mechanism for axial movement is arranged on the opposite side of the shape.   The bearing is curved in a convex shape when viewed from the direction in which the second diameter portion of the rotating shaft hits the side surface portion where the second diameter portion of the rotating shaft hits and becomes a movable stop in the axial direction, and the curvature 4. A pendulum sensor according to claim 1, wherein a stop mechanism for axial movement is arranged on the opposite side of the shape.   The pendulum sensor according to any one of claims 1 to 5, wherein the stop mechanism for the axial movement of the rotary shaft is a structure that does not contact the tip of the rotary shaft.

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