JP2010096713A - Direct-operated type position sensor, and sliding method of moving wiper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct-operated type position sensor, capable of reducing abrasion of a resistive film and a moving wiper due to the disturbance received by an input shaft. <P>SOLUTION: An input member 3 equipped in a direct-operated position sensor 1 includes an input shaft 4 and a movable member 5 configured separately from the input shaft 4. The body 51 for the movable member 5 includes moving wipers 61, 62 that slide on a resistive film equipped on a sliding substrate 8 at the outer circumferential surface. Furthermore, the movable member 5 is provided with a projecting part 53 at the surface abutting with the input shaft 4. At a housing chamber 2 for housing the movable member 5 for the input member 3, there is provided an energizing spring 7, that is disposed coaxially with the movable member 5 to bias the movable member 5, in a direction opposite to the input direction of an external force applied to the input shaft 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sliding contact method of a slider to a resistor provided in a direct acting position sensor, and a direct acting position sensor using the sliding contact method.

  Conventionally, as a direct acting type position sensor, a position sensor described in Patent Document 1 below is disclosed. In this position sensor, when the slider slides in the casing in conjunction with the displacement of the detected object, the brush fixed to the slider slides on the resistor built in the casing, and according to the displacement of the detected object. Electric power is output.

  The slider includes a pair of outer sliding surfaces whose distance from each other is reduced along the urging direction from the brush elastically contacting the resistor. The guide for guiding the movement of the slider includes a pair of inner sliding surfaces that slidably support the outer sliding surface of the slider. The slider receiving the urging force from the brush presses the outer sliding surface against the inner sliding surface of the guide, thereby suppressing displacement in the direction perpendicular to the moving direction of the slider.

  Patent Document 2 below discloses a linearly operated electric component. In this linear operation type electrical component, the operating shaft that is urged by the return spring and pressed against the inner wall of the storage part has its tip protruding outside the storage part, and when an external force is input to the tip, It moves into the storage section against the biasing force of the spring. The movable member moves in the storage unit integrally with the operation shaft while sliding on the guide unit. This amount of movement is detected by detecting a magnet attached to the movable member with a Hall element.

  In the linear operation type electrical component, the movable member urged by the rattling-preventing spring tilts with the contact portion with the operation shaft as a fulcrum and elastically contacts the guide portion. This suppresses the vibration of the movable member in a high vibration environment.

Japanese Utility Model Publication No. 6-80107 JP 2003-4478 A

  In the position sensor, when the slider serving as the input shaft is subjected to disturbance, the slider fixed to the slider is shaken integrally with the slider, and the resistor and the slider are easily worn. In addition, the linear operation type electrical component has a complicated structure because it includes many components used for preventing backlash.

  SUMMARY OF THE INVENTION In view of the above, the present invention provides a linear motion type position sensor and a sliding method for a slider that can suppress wear of a resistor and a slider due to disturbance received by an input shaft with a simple configuration. With the goal.

In order to solve such problems, a linear motion type position sensor according to the present invention includes an input shaft that can move in parallel along a substrate surface including a resistor, and a substrate that is configured separately from the input shaft. A movable member having a slider that is in sliding contact with the surface, and the movable member has a protruding portion that contacts the input shaft at a position away from the axis of the movable member, and contacts the protruding portion It moves in the direction along the substrate surface integrally with the input shaft.
The present invention also includes an input shaft that can move in parallel along a substrate surface including a resistor, and a movable member that is configured separately from the input shaft and includes a slider that is in sliding contact with the substrate surface. The input shaft has a protruding portion that contacts a position away from the axis of the movable member, and moves in a direction along the substrate surface together with the movable member that contacts the protruding portion. It is characterized by doing.
Further, the present invention is characterized in that a biasing spring that biases the movable member toward the input shaft is provided coaxially with the movable member.
The sliding method of the slider according to the present invention is a sliding method of the slider to the resistor provided in the direct acting position sensor, and is configured separately from the input shaft. The movable member provided is pressed against the input shaft with an interposition member interposed at a position away from the axis of the movable member, and the slider is brought into sliding contact with the resistor.

  According to the present invention, it is possible to suppress wear of the resistance film and the slider due to disturbance received by the input shaft.

  Hereinafter, the best mode of the present invention will be described with reference to the drawings. 1A and 1B are diagrams schematically illustrating the configuration of a direct acting position sensor 1 according to the present embodiment. FIG. 1A is a longitudinal sectional view, and FIG. 1B is a bottom surface in a state in which a guide lid 22 and an input shaft 4 are removed. FIG. In addition, each direction of the up-down, front-back, left-right used in the following description is shown in each figure used for description. The top, bottom, front, back, left and right are described for explanation, and of course may be different from the actual arrangement.

  In the linear motion position sensor 1 shown in FIG. 1, the sliders 61 and 62 supported by the input member 3 slide on the resistance film (resistor) of the sliding contact substrate 8 attached to the main body 2. The sliding position of the input member 3 is detected on the basis of the resistance value that changes along with this. The direct acting position sensor 1 includes a storage chamber 21 that stores the input member 3 and a biasing spring 7 that constantly biases the input member 3 stored in the storage chamber 21 downward.

  The storage chamber 21 has a substantially cylindrical shape, extends in the vertical direction in the main body 2, and opens on the lower surface of the main body 2. A columnar outer fitting protrusion 211 extends downward from the center of the upper inner surface of the storage chamber 21. The lower end opening 212 of the storage chamber 21 has a larger diameter than the upper end side, and the guide lid 22 is fitted from below.

  The guide lid 22 has a schematic shape in which the outer edge of the disk is bent downward, and an insertion hole 221 is opened at the center. The peripheral edge of the insertion hole 221 is a guide cylinder 222 that extends downward in a cylindrical shape and guides an input shaft 4 of the input member 3 described later. The guide lid 22 is attached to the lower end opening 212 such that the center of the insertion hole 221 coincides with the axis of the outer fitting protrusion 211.

  A pair of guide portions 213 are provided on the inner wall of the left end portion of the storage chamber 21. Each guide part 213 is arranged facing the front-rear direction and includes a guide groove 213 a extending in the up-down direction. Both guide grooves 213 a face each other and extend along the axis of the storage chamber 21.

  A sliding contact substrate 8 is provided at the left end of the storage chamber 21 with the resistance film forming surface facing the right side. The input member 3 includes an input shaft 4 to which an external force is input to the tip, and a movable member 5 that is configured separately from the input shaft 4 and to which a sliding body 6 is attached.

  2A and 2B are views showing the input shaft 4 constituting the input member 3, wherein FIG. 2A is a plan view, FIG. 2B is a left side view, and FIG. 2C is a cross-sectional view taken along line AA in FIG. . 3A and 3B are diagrams showing the movable member 5 constituting the input member 3, wherein FIG. 3A is a bottom view, FIG. 3B is a left side view, and FIG. 3C is a sectional view taken along line BB in FIG. .

  As shown in FIG. 2, the input shaft 4 includes a bottomed cylindrical shaft main body 41 with the lower end of the cylindrical body closed, and an abutting portion 42 configured by expanding the outer diameter of the upper end portion of the shaft main body 41. And. From the lower surface of the contact portion 42, a pair of locking portions 43 configured to bulge the outer peripheral surface of the shaft main body 41 outwardly extend downward.

  As shown in FIG. 3, the movable member 5 includes a cylindrical main body 51 having an inner diameter larger than the outer diameter of the abutting portion 42 of the input shaft 4 and extending in the vertical direction, and the vertical center of the main body 51. A contact plate 52 that protrudes in a flat plate shape into the main body 51 from the inner peripheral surface of the portion, and a protrusion 53 that is configured by bulging the lower surface of the right end portion of the contact plate 52 downward. I have. As shown in FIGS. 3A and 3C, the protruding portion 53 is formed around the axis of the movable member 5 and is provided at a position away from the axis. That is, when the projecting portion 53 abuts on the abutting portion 42 of the input shaft 4 and is given a pressing force from the abutting portion 42, a force that causes the movable member 5 to tilt in a direction perpendicular to the sliding direction, The movable member 5 is disposed at a position where it can be operated.

  From the upper end and the lower end of the left end portion of the main body 51, slide portions 55 extend toward the front and rear sides, respectively. The pair of upper and lower slide portions 55 extending in front of the main body 51 have the same planar shape, and the arrangement position in the left-right direction is also set to the same position. The pair of upper and lower slide portions 55 extending rearward of the main body 51 also have the same planar shape, and the arrangement position in the left-right direction is also set to the same position.

  An attachment portion 54 is provided at the upper end portion of the main body 51 at the center in the front-rear direction of the left side surface of the main body 51. The sliding body 6 is attached to the attachment portion 54. The sliding body 6 is made of a metal flat plate, and the sliders 61 and 62 are extended from a pair of leg portions bent leftward at the lower end portion.

  As shown in FIG. 1, in the input member 3, the input shaft 4 is inserted into the lower end side of the main body 51 of the movable member 5 from the contact portion 42 side, and the protruding portion 53 of the movable member 5 is on the right side. The four locking portions 43 are accommodated in the accommodating chamber 21 so as to be located on the left side. The input member 3 accommodated in the accommodation chamber 21 has the shaft main body 41 of the input shaft 4 protruding downward from the insertion hole 221 of the guide lid 22, and the biasing spring 7 is inserted into the upper end side of the main body 51 of the movable member 5. The Further, the sliding body 6 attached to the movable member 5 makes the sliders 61 and 62 elastically contact the resistance film provided in the sliding contact substrate 8 in the accommodation chamber 21.

  The urging spring 7 has an upper end that is mounted on the outer fitting protrusion 211 of the main body 2, a lower end that is inserted into the main body 51 and compressively deformed, and the movable member 5 is attached downward via the contact plate 52. It is fast. The movable member 5 urged downward by the urging spring 7 has the lower surface of the main body 51 brought into contact with the upper surface of the guide lid 22 at the periphery of the insertion hole 221 and also brought into contact with the upper surface of the contact portion 42. The projecting portion 53 presses the contact portion 42 downward.

  The input shaft 4, which is pressed downward from the protrusion 53 of the movable member 5, is movable by bringing the lower surface of the locking portion 43 into contact with the upper surface of the guide lid 22 positioned at the periphery of the insertion hole 221. The member 5 and the guide lid 22 are sandwiched in the vertical direction and positioned in the vertical direction. In addition, the movable member 5 has the slide portion 55 entered into the guide groove 213 a of the storage chamber 21. The slide portion 55 that has entered the guide groove 213a is disposed with a gap between at least one of the left and right inner surfaces of the guide groove 213a.

  Next, the operation of the direct acting potentiometer 1 will be described. FIG. 4 is a diagram for explaining the positional relationship between the input shaft 4 and the movable member 5. FIG. 5 is a diagram for explaining an arrangement relationship between the slide portion 55 of the movable member 5 and the guide groove 213a. As indicated by an arrow in FIG. 4A, when an external force is applied to the tip of the shaft body 41, the input shaft 4 presses the protruding portion 53 upward on the upper surface of the contact portion 42, and the movable member 5 is The right side of the main body 51 is moved upward against the urging force applied from the urging spring 7. As a result, as shown in FIG. 4B, the movable member 5 moves in a state where the right side is inclined upward with the protruding portion 53 applied with the pressing force from the contact portion 42 as a fulcrum, and the guide groove 213a The state where the lower surface of the left end portion of the contact plate 52 is in contact with the upper surface of the contact portion 42 is inclined with respect to the extending direction. Accordingly, the movable member 5 in which the slide portions 55 are arranged along the extending direction of the guide groove 213a as shown in FIG. 5 (a) is inclined in the guide groove 213a as shown in FIG. 5 (b). The upper left corner of the side slide portion 55 is elastically contacted with the left inner surface of the guide groove 213a, and the lower right corner of the lower slide portion 55 is elastically contacted with the left inner surface of the guide groove 213a.

  As described above, the direct acting position sensor 1 has the urging force of the urging spring 7 up to a position corresponding to the external force input to the input shaft 4 in a state where the slide portion 55 and the guide groove 213a are elastically contacted. The movable member 5 is moved against this, and the sliding contact positions of the sliders 61 and 62 with respect to the resistance film are changed. Based on the sliding contact positions of the sliders 61 and 62 with respect to the resistance film, the sliding position of the input member 3 is detected.

  According to the present embodiment, the movable member 5 that has received the biasing force from the biasing spring 7 presses the protruding portion 53 against the abutting portion 42 of the input shaft 4 and tilts the slide portion 55 with respect to the guide groove 213a to guide the guide. By elastically contacting the groove 213a, a pressing force is exerted between the movable member 5 and the guide groove 213a, and rattling of the movable member 5 can be suppressed. For this reason, it is possible to prevent the movable member 5 from moving in the accommodation chamber 21 due to minute vibrations applied to the main body 2 and the input shaft 4. Therefore, the movement of the sliders 61 and 62 in a severe vibration environment can be suppressed, and an excessive load on the resistance film can be suppressed. As a result, the reliability of the direct acting position sensor 1 can be improved.

  In the above embodiment, the case where the slide member 55 is accommodated in the guide groove 213a and the movable member 5 is guided has been described. However, the guide method of the movable member 5 is arbitrary as long as the movable member 5 whose protrusion 53 is pressed from the contact portion 42 of the input shaft 4 is tilted and elastically contacted with the guide portion. For example, the guide part 213 and the slide part 55 may be arrange | positioned in the center part of the left-right direction of the storage chamber 21. FIG. Moreover, the guide part 213 may guide the main body 51 itself. Further, the quantity and shape of the slide part 55 and the guide part 213 are also arbitrary.

  For example, as shown in FIG. 6A, the guide protrusion 213b of the guide portion 213 is accommodated in the slide groove portion 550 provided in the main body 51 of the movable member 5, and the movable member 5 is guided. As shown to (b), it is good also as a structure which accommodates the main body 51 in the guide recessed part 213c of the guide part 213, and guides the movable member 5. FIG. Further, as shown in FIG. 6C, the guide member 213 has a rectangular cross-sectional guide groove 213 a that houses the square cross-sectional slide portion 55 to guide the movable member 5. Also good.

  In the above-described embodiment, the contact portion 42 of the input shaft 4 is accommodated on the lower end side of the main body 51 of the movable member 5, and the input shaft is formed by the upper surface of the contact portion 42 and the lower surfaces of the contact plate 52 and the protruding portion 53. The case where 4 and the movable member 5 are pressed together has been described. However, the configuration in which the input shaft 4 and the movable member 5 are pressed against each other is arbitrary.

  For example, the protrusion 53 of the movable member 5 does not need to be provided at the right end of the contact plate 52, and may be provided at the left end as shown in FIG. Moreover, the shape of the protrusion part 53 is also arbitrary, and as shown in FIG.7 (b), it may have a square bottom face shape. The pressing force for pressing the slide portion 55 against the guide groove 213a is easily adjusted by determining the distance L from the axis C of the movable member 5 to the left end portion of the protruding portion 53 as shown in FIG. be able to.

  Moreover, although the said embodiment demonstrated the case where the protrusion part 53 of the movable member 5 was pressed with the contact part 42 of the input shaft 4, and the movable member 5 was inclined with respect to the extending direction of the guide part 213, for example, Alternatively, the movable member 5 may be tilted by pressing the lower surface of the contact plate 52 with a protrusion provided on the upper surface of the contact portion 42.

  Moreover, in the said embodiment, the case where the movable member 5 was inclined and the slide part 55 was elastically contacted to the guide groove 213a was demonstrated. However, if the force to tilt the movable member 5 in the direction perpendicular to the sliding direction is applied to the movable member 5 and the slide portion 55 or the sliders 61 and 62 can be pressed against the guide groove 213a or the sliding contact substrate 8. It is not necessary to tilt the movable member 5.

It is a figure which shows the outline of a structure of the linear motion type position sensor of one Embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is the bottom face of (a) in the state which removed the guide lid and the input shaft. FIG. It is a figure which shows the input shaft which comprises an input member, (a) is a top view, (b) is a left view, (c) is the sectional view on the AA line of (b). It is a figure which shows the movable member which comprises an input member, (a) is a bottom view, (b) is a left view, (c) is the BB sectional drawing of (b). It is a figure explaining the arrangement | positioning relationship between an input shaft and a movable member. It is a figure explaining the arrangement | positioning relationship between the slide part of a movable member, and a guide groove. It is a schematic diagram explaining the other example of the guide method of a movable member. It is a schematic diagram explaining the other example of a structure of the protrusion part of a movable member. It is a schematic diagram explaining the setting method of the pressing force made to act by a movable member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear motion type position sensor 2 Main body 21 Accommodating chamber 213 Guide part 213a Guide groove 213b Guide convex part 213c Guide concave part 3 Input member 4 Input shaft 42 Contact part 5 Movable member 51 Main body 52 Contact plate 53 Projection part 55 Slide part 550 Slide groove 6 Slider 61, 62 Slider 7 Energizing spring 8 Sliding substrate

Claims (4)

An input shaft that is movable in parallel along a substrate surface including a resistor, and a movable member that is configured separately from the input shaft and includes a slider that is in sliding contact with the substrate surface;
The movable member has a protrusion that contacts the input shaft at a position away from the axis of the movable member, and is integrated with the input shaft that contacts the protrusion along the substrate surface. A direct-acting position sensor that moves to An input shaft that is movable in parallel along a substrate surface including a resistor, and a movable member that is configured separately from the input shaft and includes a slider that is in sliding contact with the substrate surface;
The input shaft has a protruding portion that contacts a position away from the axis of the movable member, and moves in a direction along the substrate surface together with the movable member that contacts the protruding portion. A direct acting position sensor characterized by   3. The direct acting position sensor according to claim 1, further comprising a biasing spring that is disposed coaxially with the movable member and biases the movable member toward the input shaft. 4. A sliding method of the slider to the resistor provided in the direct acting position sensor,
A movable member that is configured separately from the input shaft and includes the slider is pressed against the input shaft with an intervening member interposed at a position away from the axis of the movable member, and the resistor is pressed against the resistor. A sliding method for a slider, wherein the slider is brought into sliding contact.

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