JP2010117207A - Rotary encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary encoder enabling reduction in the thickness and size in the radial or axial direction. <P>SOLUTION: A rotary encoder 1 equipped with a circuit board 2 inside its case includes a housing 3 which constitute a part of the case, a cover component which constitutes the case by being engaged with the housing 3, and an intermediate component 15 which stores a lead wire 91 and is engaged with the sidewall of the case, wherein the housing 3 and the cover component are engaged with each other via a part of the intermediate component 15 in a part of the sidewall of the case. Since the lead wire 91 is stored in the intermediate component 15 which is a separate component from the case, a necessity of providing a space for storing the lead wire 91 inside the case is eliminated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary encoder that converts a signal corresponding to the amount of rotation of a rotating shaft into an electric pulse.

  A rotary encoder is a sensor that has a shaft that can be freely rotated from the outside. When this shaft is rotated, an output signal corresponding to the rotation angle is generated, and mechanical rotational displacement (analog amount) is electrically detected. It is a typical detector that converts to a simple pulse (digital quantity). Conventionally, it has been used for various applications in many fields such as measurement of the position, angle, speed, etc. of a mechanical device and control of the rotational speed and amount of rotation of a motor.

  The configuration of such a conventional rotary encoder is disclosed in Patent Document 1, for example.

Japanese Utility Model Publication 3-81513

  However, the conventional rotary encoder has a housing portion for a plurality of lead wires and cables that are electrically connected to the circuit board inside the rotary encoder, so that the rotary encoder can be made thinner and smaller with only the housing portion. It was not possible to plan. Further, since a plurality of lead wires and cables are accommodated in the rotary encoder, the lead wires and cables may be caught during the assembly process of the rotary encoder.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a rotary encoder that can be reduced in thickness and size in the radial direction or the axial direction.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a rotary encoder provided with a circuit board inside a case, and constitutes a part of the case to accommodate the circuit board, and at least an upper surface is opened. A housing that is engaged with the housing to form the case, and has a top plate portion that covers at least an upper surface opening of the housing, and a plurality of members electrically connected to the circuit board. A cable configured by bundling lead wires, an intermediate member engaged with a side wall of the case and containing the lead wires, a grommet having an insertion hole through which the cable is inserted, and attached to the intermediate member; The housing and the cover member are engaged with each other through a part of the intermediate member at a part of the side wall of the case.

  According to a second aspect of the present invention, in the rotary encoder according to the first aspect, the intermediate member includes a first engagement portion that engages with a first engaged portion provided on a side wall of the case, and the grommet. And a second engaged portion that is engaged with a second engaging portion provided on the second engaging portion.

  According to a third aspect of the present invention, in the rotary encoder according to the second aspect, the intermediate member includes the first engagement means having the first engagement portion and the first engaged portion via the first engagement means. It is characterized by being configured to be detachable from the side wall.

  According to a fourth aspect of the present invention, in the rotary encoder according to the second or third aspect, the grommet includes a second engaging means having the second engaging portion and the second engaged portion. The intermediate member is detachable.

  The invention according to claim 5 is the rotary encoder according to any one of claims 2 to 4, wherein the housing and / or the cover member has a side wall, and the side wall of the housing and / or the cover member is provided. The side wall constitutes the side wall of the case, and the first engaged portion provided on the side wall of the case has a first cutout portion formed by cutting out the side wall of the housing and / or the side wall of the cover member. The first engagement portion of the intermediate member has a first groove portion provided on an outer wall of the intermediate member so as to be fitted to a first notch peripheral portion constituting the first notch portion, The second engaged portion of the intermediate member has a second cutout portion formed by cutting out an outer wall of the intermediate member, and the second engagement portion of the grommet constitutes the second cutout portion. Will fit into the second notch periphery And having a second groove provided in the flange-shaped projecting portion of the grommet.

  The invention according to claim 6 is the rotary encoder according to claim 5, wherein the first notch and the second notch have substantially the same shape, and the first groove and the second notch. The groove portion has substantially the same shape.

  According to a seventh aspect of the present invention, in the rotary encoder according to the fifth or sixth aspect, the circumferential dimension of the flange-like protruding portion of the grommet is the circumferential dimension of the second notch portion of the intermediate member. It is characterized by being larger than the dimensions.

  According to an eighth aspect of the present invention, in the rotary encoder according to any one of the fifth to seventh aspects, the first notch includes an upper wide portion and a lower narrow portion, and the intermediate member is It has the 1st support part which protrudes below from a lower surface, The said 1st support part fits in the said lower side narrow part, It is characterized by the above-mentioned.

  The invention according to claim 9 is the rotary encoder according to any one of claims 5 to 8, wherein the housing and / or the cover member has an inner wall portion located on the inner side of the side wall of the case, The intermediate member has a second support portion that protrudes to the inside of the case from the first groove portion, and the second support portion is in contact with the inner wall portion.

  According to a tenth aspect of the present invention, in the rotary encoder according to the ninth aspect, the dimension in the circumferential direction of the second support portion of the intermediate member is larger than the dimension in the circumferential direction of the first notch portion. And

  According to an eleventh aspect of the present invention, in the rotary encoder according to any one of the first to tenth aspects, the intermediate member, the grommet, and the outer jacket member of the cable are each an electrically insulating resin having elasticity. It is made of a material, wherein the hardness of the intermediate member is A, the hardness of the grommet is B, and the hardness of the jacket member of the cable is C, the magnitude of the hardness is A ≧ B ≧ C. .

  The invention according to claim 12 is the rotary encoder according to any one of claims 1 to 11, wherein the intermediate member has at least a bottom portion and an upper surface is opened. It has the 1st top plate part which covers the upper surface opening of the said housing, and the 2nd top plate part which covers the upper opening part of the said intermediate member, It is characterized by the above-mentioned.

  According to a thirteenth aspect of the present invention, in the rotary encoder according to any one of the first to eleventh aspects, the intermediate member has at least a top plate portion and an open lower surface, and the bottom portion of the housing It has the 1st bottom part covered with a cover member, and the 2nd bottom part which covers the lower surface opening of the said intermediate member, It is characterized by the above-mentioned.

  The invention according to claim 14 is the rotary encoder according to any one of claims 1 to 11, wherein the intermediate member includes a lid member having at least a top plate portion and a receiving member having at least a bottom portion, At least one of the lid member and the receiving member is detachable from the case.

  According to claims 1 to 14, the space for accommodating the lead wire is provided inside the case made up of, for example, a housing and a cover member, but according to the invention described in claim 1 and its dependent claims. For example, since the lead wire is accommodated in the intermediate member which is a separate member from the case, there is no need to provide a space for accommodating the lead wire inside the case. As a result, the case can be reduced in size, and in particular, the rotary encoder can be thinned in the vertical direction (the axial direction of the rotary encoder).

  In addition, since the case and the intermediate member are made of different members, the case and the intermediate member can be made of different materials, and therefore the material of the intermediate member can be appropriately selected and changed according to the environment.

  In particular, according to the second aspect of the present invention, the case and the intermediate member, and the intermediate member and the grommet are engaged via the engaging portions. As long as it is aligned with the structure, the shape and dimensions of each member can be freely changed.

  In particular, according to the third aspect of the present invention, since the first engaging portion of the intermediate member is configured to be detachable from the first engaged portion of the case, points other than the engaging portion with respect to the same case. Intermediate members with different specifications can be used (and vice versa), and parts can be shared. Specifically, an intermediate member can be separately prepared and replaced depending on the number and thickness of the lead wires. For example, when the lead wire is thick or has a large number, the intermediate member having a large capacity can be substituted. Conversely, when the number of lead wires is small, an intermediate member having a small capacity can be substituted.

  In particular, according to the fourth aspect of the present invention, the second engaging portion of the grommet is configured to be detachable from the second engaged portion of the intermediate member. Grommets with different specifications regarding points can be used (and vice versa), and parts can be shared. Specifically, grommets can be prepared separately for cables having different diameters depending on the number and thickness of lead wires. For example, when the lead wire is thick or when the number of cables is large and the diameter of the cable is large, it can be replaced with a grommet having a large diameter of the insertion hole. Conversely, when the cable diameter is small, it can be replaced with a grommet with a small diameter of the insertion hole.

  In particular, according to the fifth aspect of the present invention, the engagement between the first engagement portion and the first engaged portion and the engagement between the second engagement portion and the second engaged portion are notched peripheral edges. Since the groove portion is fitted to the portion, the intermediate member can be easily attached to the case and the grommet can be easily attached to the intermediate member without using an adhesive or the like. Furthermore, it is possible to ensure good sealing performance at the attachment portions of the case and the intermediate member and between the intermediate member and the grommet.

  In particular, according to the sixth aspect of the present invention, both the first notch provided in the side wall of the housing and / or the side wall of the cover member and the second notch provided in the intermediate member are the same. The grooves of the grommets can be engaged. Therefore, the intermediate member can be removed from the case in advance, and the grommet can be directly attached to the case. By doing so, the rotary encoder can be reduced in size.

  In particular, according to the invention described in claim 7, it is possible to prevent the grommet from slipping out of the intermediate member.

  In particular, according to the eighth aspect of the present invention, when the intermediate member is attached to the case, the intermediate member can be prevented from rattling or tilting.

  In particular, according to the ninth aspect of the invention, the intermediate member is brought into surface contact with the surface of the second support portion of the intermediate member and the surface of the inner wall portion provided on one or both of the housing and the cover member. Can be stably attached to the case. Further, the inner wall portion provided on one or both of the housing and the cover member can also provide an effect as a wall that prevents the lead wire from entering the case and coming into contact with the rotary drum of the encoder.

  In particular, according to the invention described in claim 10, it is possible to prevent the intermediate member from coming out of the case.

  In particular, according to the invention as set forth in claim 11, the intermediate member has sufficient hardness so that the lead wire can be reliably accommodated in the intermediate member, and at the same time, the grommet is made elastic so that the cable can be inserted. The impact resistance of the insertion hole can be increased, and the workability in the vicinity of the entrance / exit of the insertion hole can be improved by configuring the cable jacket member with a material softer than the grommet. In addition, when the grommet and the intermediate member are made of an electrically insulating resin material, the outer cover member of the cable, which is also made of the electrically insulating resin material, is damaged, resulting in an exposed state. However, it is possible to reduce the risk of malfunction.

  In particular, according to the twelfth aspect of the present invention, the first top plate portion and the second top plate portion of the cover member are configured separately to cover the upper opening of the intermediate member. Alternatively, any cover member covering the upper opening of the housing can be appropriately selected and removed.

  In particular, according to the invention described in claim 13, the shape of the intermediate member can be freely designed in accordance with an attachment target such as a motor or an arbitrary mechanical component.

  In particular, according to the invention described in claim 14, the mounting direction of the grommet can be freely designed in the axial direction or the circumferential direction by changing the shape of the lid member or the receiving member.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a top plan view of the rotary encoder according to this embodiment with the cover member removed, and FIG. 2 is a cross-sectional view taken along line AA in which the cover member is covered on the rotary encoder of FIG. In the description of the present invention, when the positional relationship and direction of each member are described in the upper, lower, left and right directions, the positional relationship and direction in the drawings are only shown, and the positional relationship and direction when incorporated in an actual device are shown. is not. In the following description, for convenience of explanation, the motor 10 side is referred to as “lower” and the cover member 6 side is referred to as “upper”.

  The rotary encoder 1 according to the present embodiment supports a housing 3 to which a light emitting element, a light receiving element, and a circuit board 2 are attached, and a slit disk 4 that is rotatably accommodated inside the housing 3 to rotate the motor 10. The hub 5 is fixed to the shaft 10a, and the cover member 6 covers the upper surface opening of the housing 3. The housing 3 and the cover member 6 constitute a case 11 of the rotary encoder 1, and the housing 3, the hub 5, and the cover member 6 are manufactured as molded products such as a resin material or a metal material.

  In the rotary encoder 1 according to the present embodiment, the hub 5 is a hollow cylindrical member in which an insertion hole 51 for inserting the rotation shaft 10a (drive shaft) of the motor 10 is opened on the lower surface. And after inserting the rotating shaft 10a of the motor 10 in the insertion hole 51 of the hub 5, it fixes to the internal peripheral surface of the hub 5 with the fixing screw 7 screwed in the screw hole 52 provided so that the side surface of the hub 5 might be penetrated. The rotating shaft 10a is fixed. Further, a base portion 53 serving as a flange surface is formed on the upper portion of the hub 5. The center hole of the slit disk 4 is fitted into the base 53, and the slit disk 4 is fixed to the upper part of the hub 5 by means such as adhesion. Therefore, the slit disk 4 also rotates together with the hub 5 in conjunction with the rotation shaft 10 a of the motor 10.

  Further, the housing 3 constituting the case of the rotary encoder 1 according to the present embodiment has a substantially cylindrical shape having an opening in which the shaft support hole 31 penetrates in the axial direction and the upper surface opens at the center in the radial direction of the bottom surface (lower surface). A housing, in which a light emitting element, a hub 5, a slit disk 4 and the like are accommodated. In addition, the hub 5 is supported on the housing 3 via a bearing 8 in the shaft support hole 31. The hub 5 supported by the housing 3 via the bearing 8 has a configuration in which the vicinity of the lower end portion protrudes from the lower surface of the housing 3, and a screw hole 52 for fixing the rotating shaft 10a of the motor 10 is formed in the protruding portion. Is provided. A seal member 54 is attached to the contact portion between the shaft support hole 31 and the hub 5 as a seal means.

  A circuit board 2 is screwed and fixed to the upper part of the housing 3. The circuit board 2 includes a light emitting element driving circuit (not shown), a signal amplification circuit, a waveform shaping circuit, a power supply circuit, and the like. The light emitted from the light emitting element reaches the light receiving element through slits formed at a constant pitch in the circumferential direction of the slit disk 4. When the slit disk 4 rotates together with the hub 5 fixed to the rotating shaft 10a, a signal that changes at a period determined by the rotation speed and the slit pitch of the slit disk 4 is obtained from the light receiving element. A rectangular wave signal obtained by amplifying and shaping the signal is output from the connector 21 to the outside as an electric pulse corresponding to the amount of rotation of the rotating shaft 10a. Then, by providing two systems of light receiving elements and their signal processing circuits, two rectangular wave signals whose quarter pitch phases are shifted from each other are output as two-phase signals. When the rotation direction changes, the phase shift between the two rectangular wave signals is reversed. A plurality of lead wires 91 are electrically connected at one end to the input / output terminals of the connector 21 on the circuit board 2, and the intermediate member 15 is engaged with the outer wall portion 32 (see FIG. 3) of the housing 3. Is derived to the outside.

  As shown in FIG. 3, a first cutout portion 321 is formed in the outer wall portion 32 constituting the outer peripheral wall portion of the housing 3 by cutting out the outer wall portion 32 of the housing 3 in a substantially U shape. The first notch portion 321 functions as a first engaged portion of the housing 3, and a first engagement portion of an intermediate member 15, which will be described in detail later, is engaged, and the intermediate member 15 is a first engagement portion. And an outer wall portion 32 of the housing 3 through a first engagement means having a first engaged portion. Since the first engaging portion of the intermediate member 15 is configured to be detachable from the first engaged portion of the housing 32, the intermediate member 15 having different specifications with respect to points other than the engaging portion is used for the same housing 3. (And vice versa) and parts can be shared. Specifically, the intermediate member 15 can be separately prepared and replaced according to the number and thickness of the lead wires 91. For example, when the lead wire 91 is thick or has a large number, the intermediate member 15 having a large capacity can be substituted. Conversely, when the number of lead wires 91 is small, the intermediate member 15 having a small capacity can be substituted. The first cutout portion 321 is a cutout portion in which two cutout portions are arranged in the vertical direction, and the upper cutout portion has a larger circumferential dimension than the lower cutout portion. The upper notch is referred to as an upper wide portion 3211, and the lower notch is referred to as a lower narrow portion 3212.

  The housing 3 is provided with an inner wall portion 33 extending in the circumferential direction via a gap P on the radially inner side of the outer wall portion 32 of the housing 3. The inner wall portion 33 serves to prevent the lead wire 91 from entering the inner wall portion 33 and hitting the slit disk 4.

  The height from the bottom surface of the housing 3 to the top surface of the intermediate member 15 after engaging the intermediate member 15 with the first engaged portion 321 of the outer wall portion 32 of the housing 3 is from the bottom surface of the housing 3 to the top surface of the inner wall portion 33. Or a size that is smaller than the height from the bottom surface of the housing 3 to the top surface of the inner wall portion 33.

  Next, the intermediate member 15 is demonstrated based on FIG.3 and FIG.4. 3 and 4 are perspective views of the housing and the intermediate member. The intermediate member 15 engaged with the outer wall portion 32 of the housing 3 temporarily accommodates a plurality of lead wires 91 led out from the connector 21 of the circuit board 2 fixed to the upper portion of the housing 3 (see FIG. 1 is a housing having an open top surface.

  Further, as shown in FIG. 4, the intermediate member 15 includes a first support portion 152 a that protrudes downward from the lower surface portion 152 of the intermediate member 15, and the lower narrow portion of the first cutout portion 321 of the housing 3. 3212 is fitted. By configuring in this way, it is possible to prevent the intermediate member 15 from rattling or tilting when the intermediate member 15 is engaged with the housing 3.

  Returning to FIG. 3, the inner wall portion 153 of the intermediate member 15 is provided with a first groove portion 154 so as to be fitted to the first notch peripheral portion 321 a constituting the first notch portion 321 of the housing 3. The groove portion 154 is configured to function as a first engaging portion of the intermediate member 15. The radially inner wall portion constituting the first groove portion 154 constitutes a flange-like second support portion 154a protruding in the circumferential direction, and the inner peripheral surface of the second support portion 154a is the inner wall of the housing 3 While being in contact with the outer peripheral surface of the portion 33, it is fitted into a radial gap P between the outer wall portion 32 and the inner wall portion 33 of the housing 3. At this time, the radial dimension of the second support part 154 a of the intermediate member 15 is set to be substantially the same as the radial dimension of the gap P between the outer wall part 32 and the inner wall part 33 of the housing 3. In addition, the circumferential dimension of the second support portion 154a of the intermediate member 15, specifically, the circumferential dimension of the inner wall portion 153 of the intermediate member 15 including the second support portion 154a is the first notch portion 321 of the housing 3. It is set to be larger than the circumferential dimension. By setting the size relationship as described above, the intermediate member 15 can be fitted into the housing 3 with high accuracy, and vibration during driving of the motor 10 can also be suppressed. As described above, the engagement between the first engaging portion of the intermediate member 15 and the first engaged portion of the housing 3 is performed by fitting the first groove portion 154 to the first notched peripheral edge portion 321a. The intermediate member 15 can be easily attached to the housing 3 without using an adhesive or the like. In addition, it is possible to ensure good sealing performance at the attachment portion of the housing 3 and the intermediate member 15.

  Further, as shown in FIG. 4, a second cutout portion 1551 is formed in the outer wall portion 155 of the intermediate member 15 by cutting out the outer wall portion 155 of the intermediate member 15 in a substantially U shape. The 2nd notch part 1551 functions as a 2nd to-be-engaged part of the intermediate member 15, the 2nd engaging part of the grommet 20 mentioned later for details is engaged, and the grommet 20 is a 2nd engaging part. It is configured to be detachable from the outer wall portion 155 of the intermediate member 15 via a second engaging means having a second engaged portion.

  Next, the grommet 20 is demonstrated based on FIG.1, FIG.2, FIG.5. FIG. 5 is a plan view of the grommet 20. The grommet 20 engaged with the outer wall portion 155 of the intermediate member 15 is a member that hermetically holds a plurality of lead wires in an insertion hole that penetrates in the radial direction, and is attached to the circuit board 2 accommodated in the housing 3. A plurality of lead wires 91 to be connected are bundled through the grommet 20 and led out to the outside as a cable 9.

  The configuration of the grommet 20 includes a substantially cylindrical main body 201, an insertion hole 202 that penetrates the main body 201 in the radial direction and through which a plurality of lead wires 91 are inserted, and a radially inner end of the main body 201. The body portion 201 has a pair of hook-like overhang portions 203 arranged in the radial direction on the surface, and extends between the pair of hook-like overhang portions 203. The 2nd groove part 204 is comprised. The second groove portion 204 functions as a second engaging portion of the grommet 20 that fits into the second notched peripheral edge portion 1551a constituting the second notched portion 1551 of the outer wall portion 155 of the intermediate member 15.

  Here, in order to ensure good sealing performance between the grommet 20 and the intermediate member 15 and to improve the stability, the following settings are made. Specifically, the circumferential dimension of the flange-like overhanging portion 203 of the grommet 20 is set to be larger than the circumferential dimension of the second notch portion 1551 of the intermediate member 15, and The dimension from the one end on the other side in the circumferential direction to the other end on the other side is set to a dimension that abuts against the inner wall surface of the circumferential wall constituting the intermediate member 15. For this reason, it is possible to prevent the grommet 20 from coming out of the intermediate member 15.

  As for the size of the second groove portion 204, the size in the circumferential direction between the two second groove portions 204 that are symmetrically arranged around the axis parallel to the radial direction in the main body portion 201 of the grommet 20 is the intermediate member 15. The outer wall portion of the second notch portion 1551 is set to be substantially the same as the circumferential dimension thereof, and the radial dimension of the second groove portion 204 constitutes the second notch peripheral portion 1551a of the intermediate member 15. It is set to be approximately the same as the dimension of 155 in the radial direction.

  With the configuration as described above, the engagement between the second engaging portion of the grommet 20 and the second engaged portion of the intermediate member 15 causes the second groove portion 204 to engage with the second notch peripheral portion 1551a. Therefore, the grommet 20 can be easily attached to the intermediate member 15 without using an adhesive or the like, and is not displaced even when an external force is applied. Furthermore, good sealing performance at the attachment portion of the intermediate member 15 and the grommet 20 can be ensured.

  Moreover, since the 2nd engaging part of the grommet 20 is comprised so that attachment or detachment with the 2nd to-be-engaged part of the intermediate member 15 is carried out, the specifications regarding points other than an engaging part differ with respect to the same intermediate member 15. Can be used (and vice versa), and parts can be shared. Specifically, the grommet 20 can be separately prepared for the cables 9 having different diameters according to the number and thickness of the lead wires 91 and can be substituted. For example, when the lead wire 91 is thick or when the number of the lead wires 91 is large and the diameter of the cable 9 is large, the grommet 20 having a large diameter of the insertion hole 204 can be substituted. On the contrary, when the diameter of the cable 9 is small, it can be replaced with the grommet 20 having a small diameter of the insertion hole 204.

  Next, the cover member 6 of the rotary encoder 1 according to the present embodiment will be described with reference to FIGS. 2, 3, 6, and 7. FIG. 6 is a perspective view of the rotary encoder immediately before covering the cover member, and FIG. 7 is a perspective view of the rotary encoder covering the cover member.

  With the intermediate member 15 engaged with the grommet 20 engaged with the outer wall portion 32 of the housing 3, the cover member 6 covers the top opening of the intermediate member 15 and the top opening of the housing 3. The outer wall portion 62 that has the portion 31 and hangs downward from the radial outer peripheral edge of the top plate portion 61 is formed with elastic engagement portions 621 that extend downward from three locations that are spaced apart in the circumferential direction. An engaging claw 621 a is formed inside the lower end of the elastic engaging portion 621. Further, on the outer wall portion 32 of the housing 3, engagement receiving portions 32 a are formed at three positions corresponding to the elastic engagement portions 621 of the cover member 6. When the cover member 6 is pushed down from above the housing 3, the three elastic engagement portions 621 are once elastically deformed outward and returned to the original state, whereby each elastic engagement portion 621 is engaged with the inner side of the lower end. The pawl 621 a engages with the engagement receiving portion 32 a of the outer wall portion 32 of the housing 3. Thus, the cover member 6 is firmly fixed to the housing 3, and the housing 3 and the cover member 6 constitute a case of the rotary encoder 1. Further, the housing 3 and the cover member 6 are engaged with each other through a part of the intermediate member 15 and / or the grommet 20 in a part of the side wall of the case.

  With the configuration as described above, the following effects can be obtained.

  Conventionally, the space for accommodating the lead wire 91 has been provided inside the case 11 made up of the housing 3 and the cover member 6, for example. Since the lead wire 91 is accommodated in the intermediate member 15 which is a body member, there is no need to provide a space for accommodating the lead wire 91 inside the case 11. Thereby, the case 11 can be reduced in size, and in particular, the rotary encoder 1 can be thinned in the vertical direction (the axial direction of the rotary encoder). In addition, since the case 11 and the intermediate member 15 are configured as separate members, it is possible to configure the case 11 and the intermediate member 15 from different materials. Accordingly, the material of the intermediate member 15 is appropriately selected and changed according to the environment. can do.

  Further, since the case 11 and the intermediate member 15 and the intermediate member 15 and the grommet 20 are engaged via the engaging portion and the engaged portion, respectively, the structure of each engaging portion is a predetermined structure. As long as they are aligned, the shape and dimensions of each member can be freely changed.

  In addition, although the outer member of the intermediate member 15, the grommet 20, and the cable 9 is each molded from an electrically insulating resin material having elasticity such as synthetic rubber, a magnitude relationship is set for each hardness. If the hardness of the intermediate member 15 is A, the hardness of the grommet 20 is B, and the hardness of the jacket member of the cable 9 is C, the magnitude of the hardness is set so that A ≧ B ≧ C. By setting in this way, the intermediate member 15 is given sufficient hardness so that the lead wire 91 is reliably accommodated in the intermediate member 15 and at the same time the grommet 20 is made elastic so that the cable 9 is The impact resistance of the insertion hole 202 to be inserted is improved, and the outer member of the cable 9 is made of a softer material than the grommet 20, so that the workability in the vicinity of the entrance / exit of the insertion hole 202 can be improved. Further, by forming the grommet 20 and the intermediate member 15 using an electrically insulating resin material, the outer cover member of the cable 9 made of the same electrically insulating resin material is damaged, so that the grommet 20 and the intermediate member 15 are exposed. Even in such a case, the risk of malfunctions can be reduced.

  As mentioned above, although embodiment of the rotary encoder 1 of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible.

  For example, in the above-described embodiment, the intermediate member 15 is engaged with the outer wall portion 32 of the housing 3, and the plurality of lead wires 91 are accommodated in the accommodating portion 151 of the intermediate member 15. In this case, the grommet 20 can be directly engaged with the outer wall portion 32 of the housing 3 without engaging the intermediate member 15. Here, the first cutout portion 321 of the housing 3 and the second cutout portion 1551 of the intermediate member 15 have substantially the same shape, and the first groove portion 154 of the intermediate member 15 and the second groove portion 204 of the grommet 20. Are set to have substantially the same shape. With this configuration, the first notch 321 provided on the side wall 32 of the housing 3 and / or the side wall 62 of the cover member 6, and the second notch 1551 provided on the intermediate member 15 are provided. The groove part 204 of the same grommet 20 can be engaged with both. Therefore, the intermediate member 15 can be removed from the case in advance, and the grommet 20 can be directly attached to the case. By doing so, the rotary encoder 1 can be reduced in size.

  The top plate 61 of the cover member 6 has a first top plate that covers the upper opening of the housing 3 and a second top plate that covers the upper opening of the intermediate member as separate bodies. You may comprise as follows. In this way, by configuring the first top plate portion and the second top plate portion of the cover member separately, the cover member that covers the upper opening of the intermediate member or the upper opening of the housing is covered. Any one of the cover members can be appropriately selected and removed.

  Further, the intermediate member is configured as a housing having at least a top plate portion and opened downward, and the bottom portion of the housing has a first bottom portion that covers the cover member and a second opening that covers the lower opening portion of the intermediate member. It can also comprise so that it may have a bottom part. By comprising in this way, the shape of an intermediate member can be freely designed according to attachment objects, such as a motor or arbitrary mechanism components.

  Further, the intermediate member may be configured to have a lid member having at least a top plate portion and a receiving member having at least a bottom portion, and at least one of the lid member and the receiving member may be configured to be detachable from the housing or the cover member. Good. By comprising in this way, the attachment direction of a grommet can be freely designed in an axial direction or a circumferential direction by changing the shape of a cover member or a receiving member.

  In the above embodiment, the intermediate member is divided into the first support portion, the outer peripheral wall portion of the housing into the first outer peripheral wall portion and the second outer peripheral wall portion, or the step portion is provided. Any other configuration may be used as long as an intermediate member having an accommodating portion capable of accommodating the lead wire can be provided.

  The attachment target of the rotary encoder 1 is not limited to the motor 10, and any mechanical component that needs to measure the rotation amount of the rotary shaft may be the attachment target.

It is an upper top view of the rotary encoder which concerns on this embodiment which removed the cover member. It is AA sectional drawing which covered the rotary encoder of FIG. 1 with the cover member. It is a perspective view of a housing and an intermediate member. It is a perspective view of a housing and an intermediate member. It is a top view of a grommet. It is a perspective view of the rotary encoder just before covering a cover member. It is a perspective view of the rotary encoder which covered the cover member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary encoder 11 Case 3 Housing 32 Outer wall part 321 1st notch part 321a 1st notch peripheral part 3211 Upper wide part 3212 Lower narrow part 33 Inner wall part 6 Cover member 61 Top plate part 62 Outer wall part 91 Lead wire 9 Cable 15 Intermediate member 151 Housing portion 152a First support portion 154 First groove portion 154a Second support portion 1551 Second notch portion 1551a Second notch peripheral portion 20 Grommet 201 Main body portion 202 Insertion hole 203 Overhang portion 204 Second groove portion

Claims (14)

A rotary encoder comprising a circuit board inside a case,
A housing that constitutes a part of the case and accommodates the circuit board, wherein at least an upper surface is opened;
A cover member having a top plate portion that forms the case by being engaged with the housing and covers at least an upper surface opening of the housing;
A cable configured by bundling a plurality of lead wires electrically connected to the circuit board;
An intermediate member engaged with the side wall of the case and containing the lead wire;
A grommet having an insertion hole through which the cable is inserted and attached to the intermediate member;
With
The rotary encoder, wherein the housing and the cover member are engaged via a part of the intermediate member in a part of a side wall of the case. The rotary encoder according to claim 1, wherein
The intermediate member includes a first engagement portion that engages with a first engagement portion provided on a side wall of the case, and a second engagement portion that engages with a second engagement portion provided on the grommet. A rotary encoder comprising: a joint portion. The rotary encoder according to claim 2, wherein
The rotary encoder is characterized in that the intermediate member is configured to be detachable from a side wall of the case via first engaging means having the first engaging portion and the first engaged portion. The rotary encoder according to claim 2 or 3,
The rotary encoder characterized in that the grommet is configured to be detachable from the intermediate member via a second engaging means having the second engaging portion and the second engaged portion. The rotary encoder according to any one of claims 2 to 4,
The housing and / or the cover member has a side wall, and the side wall of the housing and / or the side wall of the cover member constitutes a side wall of the case,
The first engaged portion provided on the side wall of the case has a first cutout portion formed by cutting out the side wall of the housing and / or the side wall of the cover member,
The first engagement portion of the intermediate member has a first groove portion provided on an outer wall of the intermediate member so as to be fitted to a first notch peripheral portion constituting the first notch portion,
The second engaged portion of the intermediate member has a second cutout portion formed by cutting out an outer wall of the intermediate member,
The second engaging portion of the grommet has a second groove portion provided in a flange-like overhanging portion of the grommet so as to be fitted to a second notched peripheral portion constituting the second notched portion. Rotary encoder. The rotary encoder according to claim 5,
The first cutout part and the second cutout part have substantially the same shape,
The rotary encoder according to claim 1, wherein the first groove portion and the second groove portion have substantially the same shape. The rotary encoder according to claim 5 or 6,
The rotary encoder according to claim 1, wherein a circumferential dimension of the flange-like protruding portion of the grommet is larger than a circumferential dimension of the second notch portion of the intermediate member. The rotary encoder according to any one of claims 5 to 7,
The first cutout part is composed of an upper wide part and a lower narrow part,
The intermediate member has a first support portion protruding downward from the lower surface thereof,
The rotary encoder according to claim 1, wherein the first support portion is fitted into the lower narrow portion. The rotary encoder according to any one of claims 5 to 8,
The housing and / or the cover member has an inner wall portion located inside the side wall of the case,
The intermediate member has a second support portion that protrudes to the inside of the case from the first groove portion,
The rotary encoder characterized in that the second support part abuts on the inner wall part. The rotary encoder according to claim 9, wherein
The rotary encoder characterized in that a dimension in the circumferential direction of the second support portion of the intermediate member is larger than a dimension in the circumferential direction of the first notch portion. The rotary encoder according to any one of claims 1 to 10,
The intermediate member, the grommet, and the cable jacket member are each made of an electrically insulating resin material having elasticity,
When the hardness of the intermediate member is A, the hardness of the grommet is B, and the hardness of the jacket member of the cable is C,
A rotary encoder characterized in that the magnitude of hardness is A ≧ B ≧ C. The rotary encoder according to any one of claims 1 to 11,
The intermediate member has at least a bottom and an upper surface is opened;
The top plate portion of the cover member includes a first top plate portion that covers the upper surface opening of the housing, and a second top plate portion that covers the upper opening portion of the intermediate member. Encoder. The rotary encoder according to any one of claims 1 to 11,
The intermediate member has at least a top plate portion and has a lower surface opened,
The rotary encoder according to claim 1, wherein a bottom portion of the housing has a first bottom portion that is covered with the cover member, and a second bottom portion that covers the lower surface opening of the intermediate member. The rotary encoder according to any one of claims 1 to 11,
The intermediate member has a lid member having at least a top plate portion and a receiving member having at least a bottom portion, and at least one of the lid member and the receiving member is detachable from the case. .

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