JP2008142859A - Snap ring inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To check whether a snap ring is correctly engaged in a ring groove in a workpiece in simpler structure. <P>SOLUTION: A measuring element 30 and a shaft 40 are moved downward to a base member 20 which is applied to a reference surface by an operator operating a handle 52. When the snap ring 90 is correctly engaged in the ring groove 91 in the workpiece 80, a lower surface 31a of the measuring element 30 is placed on an upper surface of the snap ring 90, while a lower surface 32a floats off an upper surface of a brake plate 92. When the snap ring 90 is not engaged in the ring groove 91, the lower surface 32a of the measuring element 30 is placed on the upper surface of the snap ring 90. When there is no snap ring 90, the lower surface 32a of the measuring element 30 is placed on the upper surface of the brake plate 92. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a snap ring inspection device.

Conventionally, automatic transmissions mounted on automobiles are known. For example, Patent Document 1 discloses an automatic transmission that includes a torque converter and a multi-stage transmission having a plurality of planetary gears. In this automatic transmission, a fourth brake B4 is disposed on the rear end side of the case, and a hydraulic actuator for operating the fourth brake B4 is further disposed on the rear end side. The hydraulic actuator is configured as a double piston type having a return spring. In addition, the return spring is stopped by a snap ring so as to keep the compressed state.
JP 2002-161951 A

  By the way, when assembling such an automatic transmission, it is necessary to confirm that the snap ring is correctly fitted in the case during the assembly process. A conceivable method for this is to measure the inner diameter of the snap ring in a state where the snap ring assembly process has been completed.

  However, in order to measure the inner diameter of the snap ring, for example, a plurality of measurement pawls are provided, the pawls are moved so as to contact the inner circumference of the snap ring, the inner diameter is measured, and then moved back to the original position. In many cases, the mechanical structure becomes complicated.

  The present invention has been made in view of such a problem, and provides a snap ring inspection device capable of inspecting whether or not a snap ring is normally fitted in a snap groove of a workpiece with a simpler structure. With the goal.

  The present invention adopts the following means in order to achieve the above-mentioned object.

The snap ring inspection device of the present invention comprises:
A snap ring inspection device used for inspecting whether or not a snap ring for fixing a predetermined member is normally fitted in a snap groove,
A base set at a predetermined reference position;
A movable body attached to the base so as to be movable up and down and having a bottom surface divided into an upper surface and a lower surface by a step;
A moving body shaft that is integrated with the moving body and penetrates the base in a vertical direction;
Height recognition means capable of recognizing the height of the movable body shaft relative to the base;
With
When the snap ring is correctly fitted in the snap groove, the upper step surface of the movable body is placed on the upper surface of the snap ring, and the lower step surface is in a state of floating from the upper surface of the predetermined member. When the snap ring has not reached yet, the lower step surface of the moving body is placed on the upper surface of the snap ring, and when the snap ring is a shortage, the lower step surface of the moving body Is placed on the upper surface of the predetermined member.

  In this snap ring inspection device, when the moving body and the moving body shaft integrated with the moving body are moved downward with respect to the base set at a predetermined reference position, the snap ring is correctly placed in the snap groove of the workpiece. When fitted, the upper surface of the movable body is placed on the upper surface of the snap ring, and the lower surface is floated from the upper surface of the predetermined member. When the snap ring has not reached the snap groove, The lower stage surface is placed on the upper surface of the snap ring, and when the snap ring is a shortage, the lower stage surface of the movable body is placed on the upper surface of the predetermined member. In this way, the recognized height differs between when the snap ring is correctly fitted into the workpiece's snap groove and when it is not, so by looking at the difference in height, the snap ring can be It is possible to inspect whether or not it is normally fitted. In addition, since the moving body only needs to be movable in the vertical direction with respect to the base set at the reference position, a simpler structure can be achieved. The “predetermined reference position” may be, for example, the position of a reference surface provided on the workpiece, or may be used for the snap ring inspection device based on a predetermined positional relationship with the master of the workpiece to be an inspection reference. The position may be provided. In addition, the “predetermined member” may be a member that is attached to the shaft or the cylindrical hole and can be moved in the axial direction before assembly, but is restricted after assembly.

  In the snap ring inspection device of the present invention, the moving body may have a step difference between the upper step surface and the lower step surface that is half the thickness of the snap ring. In this way, the difference between the height recognized when the snap ring is fitted normally and the height recognized when the snap ring is not fitted, and the recognition when the snap ring is fitted normally. Since the difference between the height to be recognized and the height recognized when the snap ring is missing is a distinguishable value, sufficient inspection accuracy can be ensured. “Half” includes a value in the vicinity of half.

  In the snap ring inspection device of the present invention, the moving body includes a first member in which a part of a lower surface forms the upper step surface, a second member in which a part of the lower surface forms the lower step surface, and the first member. It is good also as what consists of a fastening member which fastens 1 member and the said 2nd member. In this case, for example, by inserting an appropriate spacer between the first member and the second member according to the thickness of the snap ring, the snap ring of various thicknesses can be normally fitted. It can be checked whether or not. At this time, the second member may be movable and fastened along the bottom surface of the first member. In this way, snap rings of various widths can be inspected.

  In the snap ring inspection device of the present invention, the moving body may be a circle in which a boundary between the upper surface and the lower surface is a continuous circle centering on a central axis of the moving body. In this way, the inspection can be performed regardless of the position of the cutout of the snap ring. Alternatively, it may be an intermittent circle. If it carries out like this, reduction of the manufacturing cost of a member can be aimed at.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is an explanatory view of a snap ring inspection device 10 as an embodiment of the present invention, and FIG. 2 is a plan view of the snap ring inspection device.

  As shown in FIG. 1, the snap ring inspection apparatus 10 of the present embodiment has a disk-shaped base member 20 whose bottom surface is in contact with the reference surface of the workpiece, and a measurement that is movable in a direction perpendicular to the bottom surface of the base member 20. An element 30, a shaft 40 that is integrated with the measuring element 30 and penetrates the base member 20, a disk 50 that is fixed to the upper end of the shaft 40 and integrated with the handle 52, and that has a hole in the vertical direction in the center, And a digital gauge 60 that is inserted into the hole of the disk 50 and fixed to the upper side of the disk 50 with the contact 62 protruding from the lower surface of the disk 50.

  First, the work 80 to be inspected will be described. As shown in FIG. 1, the work 80 includes a case 95 of an automatic transmission which is a member having a space inside, a rotating shaft 94 arranged inside the case 95, a brake plate 92, a brake disc 93, a snap ring 90, and the like. Become. The case 95 has an open end on the upper side, and the brake plate 93 and the like can be assembled and inspected from the open end. The open end is formed with a reference surface used for attaching members and checking whether each attached member is attached at a normal position. Further, a snap groove 91 into which a snap ring 90 for pressing the brake plate 92 and the brake disc 93 is fitted is formed on the inner peripheral surface of the case 95 at a middle position of a predetermined distance L from the reference surface. The snap ring 90 restricts the vertical movement of the brake plate 92 and the brake disc 93 when the snap ring 90 is normally fitted in the snap groove 91.

  The base member 20 is a disk-shaped member, and is formed in a size that is fixed in a state where the base member 20 is in contact with the reference surface by being fitted to the open end of the workpiece 80. The base member 20 is provided with a plurality of holes (here, three (see FIG. 2)) through which the shaft 40 passes. Further, a linear bush 21 that supports the shaft 40 from the side surface so as to be movable up and down is fixed to the bottom surface 20a of the base member 20. The bottom surface 20a of the base member 20 abuts against the reference surface of the workpiece 80 when the snap ring 90 is inspected, and is thus processed to have a relatively high flatness.

  The measuring element 30 includes a disk-shaped first member 31 that can be inserted into the workpiece 80, and a disk-shaped first member 31 that has a smaller diameter than the first member 31 and is fixed below the first member. The second member 32 and a bolt 30b that fastens the first member 31 and the second member 32 so as to form a single structure having the same center axis. The measuring element 30 has a step 34 formed by a lower surface 31 a (upper surface) of the first member 31 and a lower surface 32 a (lower surface) of the second member 32. The step 34 is formed by designing the thicknesses of the first member 31 and the second member 32 so as to be one half of the thickness of the snap ring 90 to be inspected. The radius of the second member 32 is designed to be slightly smaller than the radius of the inner circumference of the snap ring when the snap ring 90 is normally fitted in the snap groove 91. Since the lower surface 31a of the first member 31 contacts the snap ring 90 and the lower surface 32a of the second member 32 contacts the snap ring 90 and the brake plate 92, the first member 31 is processed to have a relatively high flatness. The first member 31 and the second member 32 are provided with holes for fixing the measuring element 30 to the shaft 40 from below through the bolt 30b and integrating them. The second member 32 is designed to have a thickness greater than the height of the head so that the head of the bolt 30 a is not exposed from the lower surface 32 a of the second member 32.

  The shaft 40 is a cylindrical member and is supported from the side by the linear bush 21 so as to be movable up and down. The measuring element 30 is fixed to the lower end as described above, and the disc 50 is fixed to the upper end. ing. Therefore, when the operator operates the handle 52 integrated with the disk 50 to move the disk 50 up and down, the probe 30 fixed and integrated with the shaft 40 also moves up and down in the same manner.

  The disc 50 is a donut-shaped plate fixed to the upper end of the shaft 40, and a handle 52 and a gauge holder 54 are fixed to the upper surface thereof. In addition, a hole is provided in the center so that the contact 62 of the digital gauge 60 held by the gauge holder 54 can come into contact with the upper surface of the base member 20.

  The digital gauge 60 is a contact-type gauge, and its housing is fixed to the gauge holder 54. The digital gauge 60 measures the position by the contact 62 abutting on the upper surface of the base member 20 through a hole opened substantially at the center of the disk 50. Here, in the digital gauge 60, the base member 20 is fixed to the reference surface, and the lower surface 31 a of the first member 31 is placed on the upper surface of the snap ring 90 when the snap ring 90 is normally fitted in the snap groove 91. In other words, when the distance from the reference surface to the upper surface of the snap ring 90 is a predetermined distance L, the distance is fixed so as to indicate a predetermined reference value (for example, value 0). In order to protect the contactor 62, the contactor 62 is separated from the base member 20 when the operator is not inspecting, and the contactor 62 is vertically positioned so as to be in contact with the base member 20 when the inspection is performed. It is set and supported by the gauge holder 54. The output of the digital gauge 60 is read by a reading circuit (not shown) and the result is displayed to the operator.

  Next, the operation of the snap ring inspection apparatus 10 of the present embodiment will be described with reference to FIGS. 3 to 5 in addition to FIGS. 3 is an explanatory diagram when the snap ring 90 is normally fitted, FIG. 4 is an explanatory diagram when the snap ring 90 is not fitted, and FIG. 5 is an explanation when the snap ring 90 is missing. FIG.

  First, as shown in FIG. 1, the operator fits the base member 20 of the snap ring inspection device 10 into the opening end of the workpiece 80. Then, the bottom surface 20a of the base member 20 contacts the reference surface. Next, when the operator gradually moves the handle 52 downward, the shaft 40 is guided to the linear bush 21 and moved vertically downward to the bottom surface 20a of the base member 20, and the measuring element integrated with the shaft 40 is obtained. 30 and the disk 50 etc. move downward as they are. On the other hand, since the base member 20 is supported from below by the reference surface, the base member 20 does not move in the contacted position. Then, the first member 31 is moved downward until the lower surface 31a of the first member 31 and the lower surface 32a of the second member 32 abut against the snap ring 90 or the like.

  Here, when the snap ring 90 is correctly fitted in the snap groove 91, the lower surface 31a of the first member 31 abuts on the upper surface of the snap ring 90 and the lower surface 32a of the second member 32, as shown in FIG. Is separated from the upper surface of the brake plate 92. At this time, the value of the digital gauge 60 indicates the initially set reference value “0”. When the operator checks the value of the digital gauge 60, the operator can recognize that the snap ring 90 is correctly fitted.

  On the other hand, when the snap ring 90 is not properly fitted in the snap groove 91, the lower surface 32a of the second member 32 abuts on the upper surface of the snap ring 90, and the lower surface 31a of the first member 31 is, as shown in FIG. The position is higher than the upper surface of the snap ring 90. At this time, when the operator confirms the output from the digital gauge 90, the value is higher than the reference value when the snap ring 90 is correctly fitted. The operator can confirm this value and recognize that the snap ring 90 is not fitted.

  On the other hand, when the snap ring 90 is missing, the lower surface 32a of the second member 32 abuts on the upper surface of the brake plate 92, and the lower surface 31a of the first member 31 has a snap groove 91 as shown in FIG. The position is lower than the upper surface. At this time, when the operator confirms the output from the digital gauge 90, the value is smaller than the reference value when the snap ring 90 is correctly fitted. The operator can confirm this value and recognize that the snap ring 90 is missing.

  Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. The base member 20 of this embodiment corresponds to the base of the present invention, the probe 30 corresponds to the moving body, the shaft 40 corresponds to the moving body shaft, the digital gauge 60 corresponds to the height recognition means, and the first The member 31 corresponds to a first member, the second member 32 corresponds to a second member, the bolt 30b corresponds to a fastening member, the lower surface 31a of the first member 31 corresponds to an upper surface, and the second member The lower surface 32a of 32 corresponds to the lower step surface.

  According to the snap ring inspection apparatus 10 of the present embodiment described in detail above, the measuring element 30 and the shaft 40 are moved downward by operating the handle 52 with respect to the base member 20 in contact with the reference surface. When the snap ring 90 is correctly fitted in the snap groove 91 of the workpiece 80, the lower surface 31a of the measuring element 30 is placed on the upper surface of the snap ring 90 and the lower surface 32a is lifted from the upper surface of the brake plate 92. When the snap ring 90 does not reach the snap groove 91 and is not yet fitted, the lower surface 32a of the measuring element 30 is placed on the upper surface of the snap ring 90. When the snap ring 90 is missing, the measuring element The lower surface 32 a of 30 is placed on the upper surface of the brake plate 92. As described above, the height read by the digital gauge 60 differs depending on whether the snap ring 90 is correctly fitted in the snap groove 91 of the workpiece 80 or not. It is possible to inspect whether or not the ring 90 is normally fitted in the snap groove 91 of the workpiece 80. In addition, since it is sufficient that the probe 30 can be moved only in the vertical direction with respect to the base member 20 set on the reference surface, a simpler structure can be achieved.

  In addition, since the level difference 34 between the lower surface 31a and the lower surface 32a is half the thickness of the snap ring 90, the measuring element 30 has a height and a snap that are read by the digital gauge 60 when the snap ring 90 is normally fitted. The difference between the height read by the digital gauge 60 when the ring 90 is not fitted, and the height read by the digital gauge 60 when the snap ring 90 is normally fitted and when the snap ring 90 is missing. Any difference from the height read by the digital gauge 60 is a distinguishable value, and sufficient inspection accuracy can be ensured.

  Furthermore, since the measuring element 30 can insert a spacer such as a shim between the first member 31 and the second member 32, various spacers can be inserted by inserting an appropriate spacer according to the thickness of the snap ring 90. It is possible to inspect whether or not the snap ring 90 having a thickness is normally fitted.

  Furthermore, for example, when the inner diameter is measured by bringing a plurality of measurement nails into contact with the inner periphery of the snap ring 90, the notch portion of the snap ring 90 must be taken into consideration. Since the boundary between 31a and the lower surface 32a of the second member 32 is a continuous circle centered on the central axis of these members, inspection can be performed regardless of the position of the notch of the snap ring 90.

  In addition, this invention is not limited to the Example mentioned above at all, and as long as it belongs to the technical scope of this invention, it cannot be overemphasized that it can implement with a various aspect.

  In the embodiment described above, the probe 30 is composed of the first member 31 and the second member 32, but is not limited to those divided into these two members. For example, it may be configured as one member having substantially the same shape as the probe 30 including the first member 31 and the second member 32.

  In the above-described embodiment, the base member 20 is a disk-shaped member, but abuts against the reference surface (see FIG. 1) of the workpiece at at least two positions substantially opposite to the central axis. Any shape can be used. For example, an oval member or a triangle may be used.

  In the above-described embodiment, the first member 31 and the second member 32 are disc members. However, the snap ring 90 is provided at at least two positions on the stepped edge substantially opposite to the central axis. Any shape may be used as long as it contacts the upper surface of the brake plate or the upper surface of the brake plate 92. For example, it may be oval or triangular.

  In the embodiment described above, the measuring element 30 is composed of the first member 31 and the second member 32. However, as long as the above-described step is formed, the measuring element 30 is composed of two or more members. Also good. For example, the second member may be composed of two fan-shaped members or may be composed of eight columnar members. In this way, the manufacturing cost can be reduced. At this time, the plurality of second members may be movable and fastened along the bottom surface 31 b of the first member 31. Specifically, an oval bolt hole may be provided in the first member 31 and the fixing position may be adjusted as appropriate, and then tightened with a bolt. In this way, various widths of the snap ring 90 can be inspected. Even when only one second member 32 is provided, the second member 32 may be movable and fastened along the bottom surface 31 b of the first member 31.

  In the above-described embodiment, the fitting state of the snap ring 90 (so-called hole snap ring) fitted into the snap groove 91 formed on the inner circumferential surface of the case 95 is inspected. However, it is formed on the outer circumferential surface of the shaft. The snap ring (so-called snap ring for shaft) fitted into the snap groove may be inspected.

  In the above-described embodiment, the bottom surface of the base member 20 is brought into contact with the reference surface provided on the workpiece, and the difference in height from the reference position is measured with the digital gauge 60. A surface may be provided, and the difference in height from the reference surface may be measured with the digital gauge 60. At this time, it is assumed that a reference surface is provided outside the workpiece based on a predetermined positional relationship with the master of the workpiece serving as a reference for inspection. Further, the reference surface provided outside the workpiece may be provided in the snap ring inspection device. At this time, for example, the snap ring inspection apparatus 10 of the above-described embodiment may be provided with a gantry or a vertical movement device having a structure that can be moved in the vertical direction as it is, and the reference plane may be provided on this gantry.

  In the above-described embodiment, the snap ring inspection device 10 for inspecting the fitting state of the snap ring 90 disposed on the upper side of the brake plate 92 in the snap groove 91 has been described. However, the snap ring in the snap groove is inspected. As long as it does, it may be applied to any thing. For example, the present invention may be applied to a snap ring (not shown) arranged to restrict the vertical movement of a brake plate of another brake, or used to fix a predetermined part in a device other than an automatic transmission. You may apply to the inspection apparatus of the fitting state of the snap ring for holes, or the snap ring for shafts.

  INDUSTRIAL APPLICABILITY The present invention can be used when inspecting the assembly state of various machines, instruments, devices, and other articles using a ring member such as a snap ring. For example, the field of automobiles, motorcycles, railway vehicles, aircrafts, and the like. Is available in

It is a block diagram which shows the outline of a structure of the snap ring test | inspection apparatus 10 as one Example of this invention. 1 is a plan view of a snap ring inspection device 10. FIG. It is explanatory drawing when the snap ring 90 is engage | inserted normally. It is explanatory drawing when the snap ring 90 is not fitted. It is explanatory drawing when the snap ring 90 is missing.

Explanation of symbols

  10 snap ring inspection device, 20 base member, 21 linear guide, 30 probe, 30a, 30b bolt, 31 first member, 31a bottom surface, 31b bottom surface, 32a bottom surface, 32 second member, 40 shaft, 50 disc, 52 Handle, 54 gauge holder, 60 digital gauge, 62 contact, 80 workpiece, 90 snap ring, 91 snap groove, 92 brake plate, 93 brake disc, 94 rotating shaft, 95 case.

Claims (5)

A snap ring inspection device for inspecting whether or not a snap ring for fixing a predetermined member is normally fitted in a snap groove,
A base set at a predetermined reference position;
A movable body attached to the base so as to be movable up and down and having a bottom surface divided into an upper surface and a lower surface by a step;
A moving body shaft that is integrated with the moving body and penetrates the base in a vertical direction;
Height recognition means capable of recognizing the height of the movable body shaft relative to the base;
With
When the snap ring is correctly fitted in the snap groove, the upper step surface of the movable body is placed on the upper surface of the snap ring, and the lower step surface is in a state of floating from the upper surface of the predetermined member. When the snap ring has not reached yet, the lower step surface of the moving body is placed on the upper surface of the snap ring, and when the snap ring is a shortage, the lower step surface of the moving body Is placed on the upper surface of the predetermined member,
Snap ring inspection device. In the movable body, a step between the upper step surface and the lower step surface is half the thickness of the snap ring.
The snap ring inspection device according to claim 1. The movable body includes a first member in which a part of a lower surface forms the upper surface, a second member in which a part of a lower surface forms the lower surface, the first member, and the second member. And a fastening member for fastening
The snap ring inspection device according to claim 1 or 2. The moving body has a continuous circle whose boundary between the upper surface and the lower surface is centered on the central axis of the moving body,
The snap ring test | inspection apparatus in any one of Claims 1-3. The second member can be moved and fastened along the bottom surface of the first member.
The snap ring inspection device according to claim 3.

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