JP2007263885A - Rotation sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fallout of a pin holder for holding a fixed pin of a rotator from a pin holder storage part. <P>SOLUTION: This rotation sensor includes the rotator rotated by being mounted on a rotator to be measured; a case for storing the rotator; a detection part for detecting rotation of the rotator; each fixing pin penetrating in series into each pin insertion hole bored on each corresponding positions of the case and the rotator, for holding the rotation position of the rotator to the detection part on a neutral position; and the pin holder storage part 3 mounted on the case, for storing the pin holder 1 comprising a rubbery elastic body for holding extractably the fixing pin 4 penetrating into each pin insertion hole 1c. In the rotation sensor wherein the pin holder 1 includes a projection part 1b fixed to the pin holder storage part 3, an escape part 3b for storing the projection part 1b of the pin holder 1 is provided in the pin holder storage part 3, and a protrusion portion 2 is provided on a part other than the projection part 1b on the pin holder 1 side face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation sensor for detecting a rotation angle of an automobile steering wheel or the like.

  The rotation sensor is provided between the steering shaft and the vehicle body of the automobile, and detects the steering angle, steering speed, steering direction, etc. of the steering wheel. Based on the detection result, the steering of the rear wheels in the four-wheel steering vehicle is detected. Control is performed. Recently, a steer-by-wire technique for performing a steering shaft of an automobile by means other than mechanical means has been studied.

  As such a rotation sensor, for example, the rotation position of the rotating body with respect to the case, the rotating body (code wheel) housed in the case, the signal detecting element unit and the rotating substrate, and the signal detecting element unit is set to a rotation angle of 0 degree. There are known a case that is held in position and a fixed pin that is continuously penetrated through a pin insertion hole that is opened at a corresponding position of the rotating body (Patent Document 1).

Japanese Patent Laying-Open No. 2005-9879 (see FIG. 4)

  However, the rotation sensor described above has a structure in which the fixing pin is fixed by pressing the protruding portion of the holder with the holder storage portion. However, depending on the shape of the protruding portion of the holder and the drop-off preventing means, the fixing pin may be removed. In some cases, the holder dropped out of the holder housing.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotation sensor in which a pin holder for holding a fixing pin is unlikely to fall off from a pin holder storage portion.

  According to the first aspect of the present invention, there is provided a rotating body that is attached to the rotating body to be measured and rotates, a case that houses the rotating body, a detection unit that detects the rotation of the rotating body, the case, and the rotating body A fixed pin that is passed through each pin insertion hole that is opened at a corresponding position in the series and holds the rotational position of the rotating body with respect to the detection unit in a neutral position, and is attached to the case and passes through each pin insertion hole And a pin holder housing portion that houses a pin holder made of a rubber-like elastic body that holds the fixed pin so that it can be inserted and removed, and the pin holder is provided with an overhanging portion that is fixed to the pin holder housing portion The pin holder storage portion is provided with a relief portion in which the overhang portion of the pin holder is accommodated, and protrudes at a location other than the overhang portion on the side surface of the pin holder. A rotation sensor, characterized in that is provided.

  According to a second aspect of the present invention, in the rotation sensor according to the first aspect of the present invention, a gap is provided between an inner side wall of the relief portion of the pin holder housing portion and the protruding portion of the pin holder. is there.

  In the rotation sensor of the present invention, since the protrusion is provided at a place other than the protruding part of the pin holder that holds the fixing pin to increase the outer diameter, the place where the protrusion is provided is formed on the inner surface of the small diameter cylindrical part of the pin holder storage part. It is possible to adjust the holding force of the fixing pin only by the protruding portion, and it is not necessary to press the overhanging portion in the center direction with the pin holder storage portion in order to adjust the holding force of the fixing pin. It becomes difficult for the pin holder to fall off from the pin holder housing.

  Moreover, since the gap is provided between the side wall of the relief portion of the pin holder storage portion and the overhang portion of the pin holder, the overhang portion is not pressed in the center direction by the pin holder storage portion. The pin holder is more difficult to drop off from the pin holder storage portion.

  A preferred embodiment of the present invention will be described. The rotation sensor of the present embodiment has a structure that is temporarily fixed using a fixing pin in order to hold the rotating position of the rotating body that is attached to the rotating body to be measured and rotates in a neutral position. Moreover, the rotation sensor of this embodiment has a pin holder which temporarily fixes a fixing pin to a case.

  As shown in FIG. 1, the pin holder 1 is composed of a connecting portion 1a and a protruding portion 1b having a large outer diameter. A guide hole 1c and a slit 1d are provided through the inside in the vertical direction, and further directly above the protruding portion 1b. The protrusion 2 is provided on the outer periphery of the connecting portion 1a.

  When the pin holder 1 is housed in the pin holder housing portion 3 shown in FIG. 2 (a), the overhanging portion 1b of the pin holder 1 is housed in the escape portion 3b of the pin holder housing portion 3, as shown in FIG. The portion of the pin holder 1 where the protrusion 2 is provided (the lower portion of the connecting portion 1a) is reduced in diameter, and the inner diameter of the slit 1d is reduced. In FIG. 2B, 11 is a case, 12 is a rotating body, and 11a and 12a are holes formed in the case 11 and the rotating body 12, respectively.

  When the fixing pin 4 is inserted into the guide hole 1c and the slit 1d of the pin holder 1, the protruding portion 1b of the pin holder 1 is accommodated in the escape portion 3b of the pin holder accommodating portion 3 as shown in FIG. 2 is firmly attached to the inner surface of the cylindrical portion 3 a of the pin holder housing 3. Therefore, the pin holder 1 is unlikely to fall out of the pin holder storage portion 3 when the fixing pin 4 is extracted. Moreover, the overhang | projection part 1b of the pin holder 1 is latched by the escape part 3b inner side upper surface of the pin holder accommodating part 3, and this also contributes to drop-off prevention.

  Since the fixing pin 4 is firmly held by the inner surface of the guide hole 1c and the inner surface of the slit 1d having a narrow inner diameter, the insertion direction of the fixing pin 4 is accurately defined. In FIG. 2C, reference numeral 4a denotes a fixing pin knob.

  FIG. 3A is a perspective view of the pin holder storage portion 3 provided with the gap 3c. The pin holder 1 is stored in the pin holder storage portion 3 (FIG. 3B), and the fixing pin 4 is further guided by the guide of the pin holder 1. FIG. When inserted into the hole 1c and the slit 1d (FIG. 3 (c)), the pin holder is prevented from falling off as shown in FIG. 2, the insertion direction of the fixing pin is defined, and the gap 3c is provided. Since the overhanging portion 1 b of the pin holder 1 is not deformed in the center direction of the pin holder 1, the pin holder 1 is not easily dropped from the pin holder storage portion 3.

  In the present embodiment, the protruding portion 2 is provided at an arbitrary position on the outer periphery of the pin holder 1 connecting portion 1a. However, the portion directly above the protruding portion 1b is most effective for preventing the pin holder 1 from falling off and is recommended. Further, the protruding portion 2 can be partially provided at the outer periphery of the connecting portion 1a. In this case, the center points of the guide hole 1c and the slit 1d of the pin holder 1 are made to coincide with the center point of the pin holder storage portion 3, The insertion direction of the fixing pin 4 is accurately defined. The protrusion 2 may be provided integrally with the pin holder 1 or may be provided by attaching another member with an adhesive or the like.

  In the present invention, if the escape portion 3c is provided on the left and right or the front and rear opposing side walls of the large diameter cylindrical portion 3b of the pin holder storage portion 3, the relief of the pin holder 1 is made uniform with respect to the circumferential direction. Good insertion is recommended.

  As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that embodiment of this invention is not restricted to what was mentioned above.

It is an expanded view of the pin holder which shows the 1st Embodiment of this invention. (A) a perspective view of a pin holder storage part showing a second embodiment of the present invention, (b) a longitudinal sectional view of a state in which the pin holder is stored in the pin holder storage part, and (c) a vertical section in a state where a fixing pin is inserted into the pin holder FIG. (A) a perspective view of a pin holder accommodating portion showing a third embodiment of the present invention, (b) a longitudinal sectional view of a state in which the pin holder is accommodated in the pin holder accommodating portion, and (c) a longitudinal section in a state where a fixing pin is inserted into the pin holder FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pin holder 1a Pin holder connection part 1b Pin holder extension part 1c Pin holder insertion hole 1d Pin holder slit 2 Projection part 3 provided in the pin holder Pin holder storage part 3a Small diameter cylindrical part 3b of the pin holder storage part Relief part 3c of the pin holder storage part Air gap 4 in pin holder housing 4 Fixed pin 4a Fixed pin knob 11 Upper case 11a Hole 12 opened in upper case Rotating body 12a Hole opened in rotating body

Claims (2)

A rotating body that is attached to the rotating body to be measured and rotates, a case that houses the rotating body, a detection unit that detects the rotation of the rotating body, and each of the case and the rotating body that are provided at corresponding positions. A fixed pin that is passed through a pin insertion hole in series and that holds the rotational position of the rotating body with respect to the detection unit at a neutral position, and the fixing pin that is attached to the case and penetrates the pin insertion hole can be inserted and removed. A rotation sensor provided with a pin holder housing portion for housing a pin holder made of a rubber-like elastic body to be held, wherein the pin holder is provided with an overhanging portion fixed to the pin holder housing portion;
The pin holder housing portion is provided with a relief portion for housing the overhang portion of the pin holder, and a protrusion is provided at a location other than the overhang portion on the side surface of the pin holder. Rotation sensor.   The rotation sensor according to claim 1, wherein a gap is provided between a side inner wall of the relief portion of the pin holder storage portion and the protruding portion of the pin holder.

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