JP4214408B2 - Snap ring assembly inspection device and snap ring assembly inspection method - Google Patents

Description

  The present invention relates to a snap ring assembly inspection device and a snap ring assembly inspection method, and in particular, a snap ring for inspecting whether or not a pair of snap rings are properly assembled in a piston pin assembly hole of a piston. The present invention relates to an assembly inspection device and a snap ring assembly inspection method.

  Generally, an engine piston is connected to a connecting rod via a piston pin. The piston pin is positioned in the axial direction of the piston pin assembly hole by a pair of snap rings assembled on both sides of the piston pin assembly hole of the piston. Conventionally, whether or not each snap ring is properly assembled in each snap ring assembly groove of the piston pin assembly hole is inspected by a snap ring assembly inspection device. For example, in the piston snap ring assembling device 41 described in Patent Document 1 shown in FIG. 11, the measuring rod 42 is projected from the tip of the upper press-fit rod 43 by a cylinder with a magnetic scale, and the tip of the lower press-fit rod 44 is used. The distance between the press-fit rods 43 and 44 is derived by measuring the protruding length of the test rod 42 from the upper press-fit rod 43 in a state where it is in contact with the press-fit rods 43 and 44. Then, the assembly interval between the pair of snap rings 4 and 5 is calculated from the distance between the obtained press-fitting rods 43 and 44, and when the assembly interval is within the set range, each snap ring 4 and 5 It is determined that the snap ring assembly grooves 11 and 12 of the piston pin assembly hole 3 are properly assembled.

However, as shown in FIG. 12, in the piston snap ring assembly device 41, the lower snap ring 5 is not assembled, and the piston pin 9 corresponds to the piston pin 9 with respect to the piston pin assembly hole 3. Even when the position is shifted downward relative to the proper position, it may be determined that the snap rings 4, 5 are properly assembled in the snap ring mounting grooves 11, 12. There is a possibility that the piston 2 on which one of the snap rings 5 (4) is not assembled is assembled to the cylinder block. Therefore, a more reliable snap ring assembly inspection device and assembly inspection method are desired.
Japanese Utility Model Publication No. 3-100031 (page 7, line 18 to page 15, line 2, FIGS. 1 and 4)

Therefore, the present invention has been made in view of the above circumstances, and a first object is to provide a snap ring assembly inspection device with higher reliability.
A second object is to provide a snap ring assembly inspection method with higher reliability.

In order to achieve the first object, in the snap ring assembly inspection device according to claim 1 of the present invention, is the pair of snap rings properly assembled in the piston pin assembly hole of the piston? A snap ring assembly inspection device for inspecting whether or not, a movable head inserted into one side of a piston pin assembly hole and movable in the axial direction of the piston pin assembly hole, and a piston pin assembly A fixed head that is inserted into the other side of the attached hole and can be brought into contact with a snap ring on the other side assembled on the other side of the piston pin assembly hole, and the movable head has a piston pin assembly hole. A first measuring element capable of coming into contact with a snap ring on one side assembled on one side of the piston pin and moved in the axial direction of the piston pin assembly hole with respect to the first measuring element, A second probe contacted with the end surface, A first sensor that measures the axial distance of the piston pin assembly hole between the contact surface of the first probe and the contact surface of the second probe; and a fixed head A second sensor for measuring the distance in the axial direction of the piston pin assembly hole between the contact surface of the second probe and the contact surface of the second measuring element, the measurement result of the first sensor, and the measurement of the second sensor And determining means for determining whether or not the pair of snap rings are properly assembled in the piston pin assembly hole based on the result.

In order to achieve the second object, a snap ring assembly inspection method according to claim 2 of the present invention comprises a snap ring assembly using the snap ring assembly inspection device according to claim 1. In this method, a fixed head capable of contacting a snap ring assembled on the other side of the piston pin assembly hole is inserted into the other side of the piston pin assembly hole, and then the movable head is moved to the piston. A first probe that can be moved in the axial direction of the pin assembly hole and abutted on a snap ring assembled on one side of the piston pin assembly hole is inserted into one side of the piston pin assembly hole and 2 in contact with one end surface of the piston pin, and in this state, the axial direction of the piston pin assembly hole between the contact surface of the first probe and the contact surface of the second probe The distance is measured by the first sensor and the fixed head The distance in the axial direction of the piston pin assembly hole between the contact surface and the contact surface of the second measuring element is measured by the second sensor, and the measurement result of the first sensor and the measurement result of the second sensor are measured. Based on the above, it is determined whether or not the pair of snap rings are properly assembled in the piston pin assembly hole.

Therefore, according to the first and second aspects of the present invention, the snap ring is connected to the piston pin by the distance in the axial direction of the piston pin assembly hole between the contact surface of the first probe and the contact surface of the second probe. It is determined whether or not it is properly assembled to one side of the assembly hole, and the axial distance of the piston pin assembly hole between the contact surface of the fixed head and the contact surface of the second measuring element Thus, it is determined whether or not the snap ring is properly assembled to the other side of the piston pin assembly hole.

  A snap ring assembly inspection device and a snap ring assembly inspection method with higher reliability can be provided.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the snap ring assembly inspection device 1 (hereinafter simply referred to as the assembly inspection device 1) includes both sides of the piston pin assembly hole 3 of the piston 2 (both sides in the vertical direction in FIG. 1). ) Provided in the snap ring mounting grooves 11 and 12, and inspecting whether or not the pair of snap rings 4 and 5 are properly assembled, and one side of the piston pin mounting hole 3. A movable head 6 engaged with the upper side of the piston pin assembly hole 3 and a fixed head 7 engaged with the other side of the piston pin assembly hole 3 (the lower side of the paper surface in FIG. 1). Composed. As shown in FIG. 2 and FIG. 3, the fixed head 7 is formed in a substantially cylindrical shape and is erected on the base 8 of the assembly inspection apparatus 1. As shown in FIG. 1, the fixed head 7 has a guide portion 31 having a slope inclined at a predetermined angle with respect to the axis of the fixed head 7 at the center of the upper end surface 7 a of the fixed head 7. The other end of the hollow portion 10 of the piston pin 9 (the end on the lower side in FIG. 1) is guided by the guide portion 31.

  As shown in FIG. 1, a contact surface 32 formed in an annular shape is provided on the outer side of the upper end surface 7 a of the fixed head 7 through a step smaller than the diameter of the snap ring 5. The fixed head 7 comes into contact with the snap ring 5 when the snap ring 5 is properly assembled in the snap ring assembly groove 12. As shown in FIG. 8, when the snap ring 5 is not properly fitted in the snap ring assembly groove 12 and the snap ring 5 is not sufficiently expanded in diameter, the upper end surface of the fixed head 7 is used. The peripheral end of 7a is brought into contact with the snap ring 5. As shown in FIG. 7, when the snap ring 5 is not assembled in the snap ring assembly groove 12, the upper end surface 7 a of the fixed head 7 is brought into contact with the other end surface 9 b of the piston pin 9. Configured as follows.

  As shown in FIGS. 2 and 3, the movable head 6 is formed in a substantially cylindrical shape, and is attached to the frame 15 of the assembling apparatus 1 with a head mounting bracket 13 and a linear motion guide 14 (see FIGS. 3 and 4). )), The first measuring element 16 is provided so as to be movable in the vertical direction (the axial direction of the piston pin assembly hole 3 and the vertical direction as viewed in FIG. 2 and FIG. 3). The first measuring element 16 is configured such that the abutting surface 17 abuts against the snap ring 4 when the snap ring 4 is properly assembled in the snap ring assembling groove 11. . Further, as shown in FIGS. 1 and 2, the movable head 6 is disposed in the hollow portion of the first probe 16 in the axial direction relative to the first probe 16 (in FIGS. 1 and 2). A second probe 18 that can be moved in the vertical direction of the drawing is accommodated. The second probe 18 is provided with a guide portion 19 having a slope inclined at a predetermined angle with respect to the axis of the movable head 6 at the center of the lower end surface. One end of the hollow portion 10 is guided.

  In addition, the second measuring element 18 is assembled when the snap ring 4 is properly assembled in the snap ring assembly groove 11 (see FIG. 1) or the snap ring 4 is assembled in the snap ring assembly groove 11. If not (see FIG. 5), the contact surface 20 contacts the one end surface 9a of the piston pin 9. Further, in the second measuring element 18, the snap ring 4 assembled on one side of the piston pin assembly hole 3 is not properly fitted in the snap ring assembly groove 11, and the snap ring 4 is sufficiently expanded. When the diameter is not set (see FIG. 6), the peripheral end portion of the contact surface 20 is configured to contact the snap ring 4. As shown in FIGS. 2 to 4, the assembly inspection apparatus 1 has a linear scale 22 (first sensor) attached to the head mounting bracket 13 via a sensor mounting bracket 21. The upper end of the second measuring element 18 is connected to the linear scale 22.

  In the assembly inspection apparatus 1, the axial direction of the piston pin assembly hole 3 between the contact surface 17 of the first probe 16 and the contact surface 20 of the second probe 18 by the linear scale 22. Distance L1 (the amount of protrusion of the second probe 18 relative to the first probe 16) is measured. In the assembly inspection apparatus 1, the measurement result of the linear scale 22 (distance L 1 between the contact surface 17 and the contact surface 20, hereinafter referred to as the first measurement result) is configured by a microcomputer. When the first measurement result is within the first setting range after being processed by the arithmetic device (determination means), it is determined that the snap ring 4 is properly assembled in the snap ring assembling groove 11. Thus, when the first measurement result is outside the first setting range, it is determined that the snap ring 4 is not properly assembled in the snap ring assembly groove 11. In the assembly inspection apparatus 1, the minimum value of the first setting range is set to the diameter of the snap ring 4, and the maximum value is (diameter of the snap ring 4) + (snap ring 4 and piston pin). 9).

  As shown in FIG. 1, the assembly inspection apparatus 1 includes a linear scale 24 (second sensor) attached to the base 8 via a sensor mounting bracket 23. The lower surface of the measuring element 25 fixed to the second measuring element 18 and extending in the horizontal direction is brought into contact with each other in an orthogonal state. Furthermore, in the assembly inspection apparatus 1, the linear scale 24 allows the axial distance L 2 of the piston pin assembly hole 3 between the contact surface 20 of the second probe 18 and the contact surface 32 of the fixed head 7 to be set. Measured. In the assembly inspection apparatus 1, the measurement result of the linear scale 24 (distance L2 between the contact surface 20 and the contact surface 32, hereinafter referred to as the second measurement result) is calculated by the calculation device. Then, when the first measurement result is within the first setting range and the second measurement result is within the second setting range, each snap ring 4, 5 is connected to the piston pin assembly hole 3. It is determined that each of the snap ring assembly grooves 11 and 12 is properly assembled. Further, the assembly inspection apparatus 1 is configured such that the snap ring 5 is a piston pin when the first measurement result is within the first setting range and the second measurement result is outside the second setting range. It is determined that the snap ring assembly groove 12 of the assembly hole 3 is not properly assembled.

In the assembly inspection apparatus 1, the maximum value of the second setting range is (the axial length of the piston pin 9) + (the diameter of the snap ring 5) + (the upper end surface 7a of the fixed head 7). The minimum value is set to (the axial length of the piston pin 9) + (the step between the upper end surface 7a of the fixed head 7 and the contact surface 32). In addition, as shown in FIG. 2, the assembly inspection apparatus 1 includes a pair of a movable head 6 and a fixed head 7 arranged in parallel at a predetermined interval. Thereby, in this assembly | attachment inspection apparatus 1, it has a structure which can test | inspect two pistons 2 simultaneously. As shown in FIGS. 2 to 3, the assembly inspection apparatus 1 is configured such that the first measuring elements 16 of the movable heads 6 arranged side by side are vertically guided by the linear guide 26. The plate 27 is connected via a compression coil spring 28. Further, the assembly inspection apparatus 1 is provided with a substantially T-shaped handle 29 on the lifting plate 27 and a weight 30 for biasing the lifting plate 27 to the lifting side.

  Next, an assembly inspection method for the snap rings 4 and 5 using the assembly inspection apparatus 1 will be described. First, a work (the one in which the piston 2 and the connecting rod 33 are connected by the piston pin 9) is set on a jig installed on the base 8 of the assembly inspection device 1, and the fixed head 7 is moved to the piston of the piston 2. The other side of the pin assembly hole 3 is engaged. Next, the movable head 6 is lowered by operating the handle 29 downward. As a result, the first measuring element 16 of the movable head 6 is fitted to the one side of the piston pin assembly hole 3 (clearance fitting) and compressed by the spring force of the compression coil spring 28 to compress one end surface of the piston pin 9. The second measuring element 18 is suspended toward the first measuring element 16 so as to be lowered by its own weight. In this state, the linear scale 22 (first sensor) causes the abutting surface 17 of the first measuring element 16 and the abutting surface 20 of the second measuring element 18 in the axial direction of the piston pin assembly hole 3. The distance L1 (the protruding amount of the second measuring element 18 with respect to the first measuring element 16) is measured, and fixed to the contact surface 20 of the second measuring element 18 by the linear scale 24 (second sensor). A distance L2 in the axial direction of the piston pin assembly hole 3 with the contact surface 32 of the head 7 is measured.

  Then, each measurement result of each linear scale 22, 24 is processed by an arithmetic device (determination means), and each snap ring 4, 5 is properly fitted in each snap ring assembly groove 11, 12 of the piston pin assembly hole 3. It is determined whether or not it is assembled. Here, as shown in FIG. 1, when each snap ring is properly assembled in each snap ring assembly groove 11, 12 of the piston pin assembly hole 3, the first of the movable head 6. The contact surface 17 of the probe 16 contacts the snap ring 4, the contact surface 20 of the second probe 18 contacts the one end surface 9 a of the piston pin 9, and the fixed head 7 contacts. The surface 32 is brought into contact with the snap ring 5. In this case, the first measurement result (distance L1 between the contact surface 17 and the contact surface 20) is within the first setting range set in the arithmetic device, and the snap ring 4 is attached to the snap ring by the arithmetic device. At the same time as determining that the groove 11 is properly assembled, the second measurement result (distance L2 between the contact surface 20 and the contact surface 32) is within the second set range set in the arithmetic unit. Therefore, it is determined by the arithmetic unit that the snap ring 5 is properly assembled in the snap ring assembly groove 12.

  Further, as shown in FIG. 5, when the snap ring 4 is not assembled in the snap ring assembly groove 11, or as shown in FIG. 6, the snap ring 4 is appropriate for the snap ring assembly groove 11. The first measurement result (distance L1 between the contact surface 17 and the contact surface 20) is out of the first set range set in the arithmetic unit. (Below the minimum value) and it is determined by the arithmetic unit that the snap ring 4 is not properly assembled in the snap ring assembly groove 11. Furthermore, even when the snap ring 4 is properly assembled in the snap ring assembly groove 11, the snap ring 5 is not assembled in the snap ring assembly groove 12 as shown in FIG. In this case, or as shown in FIG. 8, when the snap ring 5 is not properly fitted in the snap ring assembly groove 12 and the diameter is not sufficiently expanded, the second measurement result (the contact surface 20 And the abutment surface 32 is outside the second setting range set in the arithmetic unit, and the arithmetic unit determines that the snap ring 5 is not properly assembled in the snap ring mounting groove 12. The

  When the snap ring 5 shown in FIG. 7 is not assembled in the snap ring assembly groove 12, the second measurement result (distance L2 between the abutment surface 20 and the abutment surface 32) is an arithmetic unit. If the snap ring 5 shown in FIG. 8 is not properly fitted in the snap ring mounting groove 12 and is not sufficiently expanded in diameter, the second value is less than the minimum value of the second setting range set to (The distance L2 between the contact surface 20 and the contact surface 32) exceeds the maximum value of the second setting range set in the arithmetic unit.

This embodiment has the following effects.
In the assembly inspection apparatus 1, the fixed head 7 is engaged with the other side of the piston pin assembly hole 3 and the movable head 6 is engaged with one side of the piston pin assembly hole 3. , 5 are properly assembled in the snap ring assembly grooves 11, 12 of the piston pin assembly hole 3, the contact surface 17 of the first probe 16 of the movable head 6 is attached to the snap ring 4. At the same time, the contact surface 20 of the second measuring element 18 contacts the one end surface 9 a of the piston pin 9, and the contact surface 32 of the fixed head 7 contacts the snap ring 5.

  Then, by the linear scale 22 (first sensor), the axial distance L1 of the piston pin assembly hole 3 between the contact surface 17 of the first probe 16 and the contact surface 20 of the second probe 18 is measured. The amount of protrusion of the second measuring element 18 relative to the first measuring element 16 is measured, and the snap ring set is based on the first measurement result (distance L1 between the contact surface 17 and the contact surface 20). Whether or not the snap ring 4 is properly assembled in the groove 11 is determined by an arithmetic device (determination means). At the same time, the distance in the axial direction of the piston pin assembly hole 3 between the contact surface 20 of the second probe 18 and the contact surface 32 of the fixed head 7 is measured by the linear scale 24 (second sensor). L2 is measured, and based on the second measurement result (distance L2 between the contact surface 20 and the contact surface 32) and the first measurement result, the snap ring 5 is properly fitted in the snap ring assembly groove 12. Is determined by the arithmetic unit.

  Therefore, in the assembly inspection apparatus 1, the position of the one end surface 9 a of the piston pin 9 is detected by the second probe 18 of the movable head 6, and the fixed head is based on the position of the one end surface 9 a of the piston pin 9. The position of 7 is confirmed. Thereby, when the snap ring 5 is not assembled in the snap ring assembly groove 12 and the piston pin 9 is displaced with respect to the proper position of the piston pin 9 with respect to the piston pin assembly hole 3 ( Even in the case of FIG. 12), it is possible to provide an assembly inspection apparatus 1 that is not erroneously determined, has no erroneous determination, and has extremely high reliability, unlike the conventional assembly apparatus 41. .

In addition, embodiment is not limited above, For example, you may comprise as follows.
As shown in FIG. 9, the snap ring 5 is fixed to the base 8 of the assembly inspection device 1 so that the snap ring 5 is properly assembled to the snap ring assembly groove 12 on the other side of the piston pin assembly hole 3. In this case, the third measuring element 52 with which the contact surface 51 comes into contact with the snap ring 5 and the snap ring 5 housed in the third measuring element 52 are assembled into the snap ring mounting groove 12 appropriately. When the snap ring 5 is attached, or when the snap ring 5 is not attached to the snap ring assembly groove 12, the contact surface 53 contacts the other end surface 9b of the piston pin 9, and the piston pin assembly hole 3 When the snap ring 5 assembled on the other side is not properly fitted in the snap ring assembly groove 12 and the snap ring 5 is not sufficiently expanded in diameter (see FIG. 10), the contact surface 53 The peripheral edge is in contact with the snap ring 5 A fourth of the probe 54 may be configured fixed head 7 contains.

  In this case, the distance in the axial direction of the piston pin assembly hole 3 between the contact surface 17 of the first probe 16 and the contact surface 20 of the second probe 18 is measured by the linear scale 22 (first sensor). L1 (the protruding amount of the second measuring element 18 with respect to the first measuring element 16) is measured, and the contact surface 51 of the third measuring element 52 and the fourth are measured by the linear scale 24 (second sensor). The distance L2 in the axial direction of the piston pin assembly hole 3 with the contact surface 53 of the measuring element 54 (the protruding amount of the fourth measuring element 54 with respect to the third measuring element 52) is measured. Then, based on the measurement results of the linear scales 22 and 24, whether or not the snap rings 4 and 5 are properly assembled in the snap ring assembly grooves 11 and 12 of the piston pin assembly hole 3 is determined. Determined.

It is explanatory drawing of this Embodiment, Comprising: The figure which shows the state with which the movable head and the fixed head were engaged with the piston pin assembly hole by which each snap ring was assembled | attached appropriately to each snap ring assembly groove | channel. It is. It is a front view of this assembly inspection apparatus. It is a side view of this assembly inspection apparatus. It is a top view of this assembly inspection apparatus. It is explanatory drawing of this Embodiment, Comprising: It is a figure which shows the state by which the movable head and the fixed head were engaged with the piston pin assembly hole by which the snap ring is not assembled | attached to the snap ring assembly groove of one side. is there. It is explanatory drawing of this Embodiment, Comprising: A snap ring is not assembled | attached appropriately to the snap ring assembly groove of one side, The piston ring assembly hole of the state which the said snap ring is not fully expanded in diameter It is a figure which shows the state with which the movable head and the fixed head were engaged. It is explanatory drawing of this Embodiment, Comprising: It is a figure which shows the state by which the movable head and the fixed head were engaged with the piston pin assembly hole by which the snap ring is not assembled | attached to the snap ring assembly groove of the other side. is there. It is explanatory drawing of this Embodiment, Comprising: A snap ring is not assembled | attached appropriately to the snap ring assembly groove of the other side, The piston pin assembly hole of the state which the said snap ring is not fully expanded in diameter It is a figure which shows the state with which the movable head and the fixed head were engaged. It is explanatory drawing of other embodiment, Comprising: The state which the movable head and the fixed head were engaged with the piston pin assembly hole by which each snap ring is assembled | attached appropriately by each snap ring assembly groove | channel is shown. FIG. It is explanatory drawing of other embodiment, Comprising: A snap ring is not assembled | attached appropriately to each snap ring assembly groove, It is movable to the piston pin assembly hole of each state where each snap ring is not fully expanded in diameter It is a figure which shows the state by which the head and the fixed head were engaged. It is explanatory drawing of the conventional snap ring assembly | attachment apparatus, Comprising: It is a figure which shows the state in which the assembly | attachment test | inspection of a snap ring is performed appropriately. It is explanatory drawing of the conventional snap ring assembly apparatus, Comprising: The movable head and the fixed head were engaged with the piston pin assembly hole of the state which is not assembled | attached to the snap ring assembly groove of the other side It is a figure which shows a state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Assembly inspection apparatus, 2 piston, 3 piston pin assembly hole, 4,5 snap ring, 6 movable head, 7 fixed head, 9 piston pin, 16 1st probe, 17, 20, 32 contact surface, 18 Second measuring element, 22 Linear scale (first sensor), 24 Linear scale (second sensor)

Claims (2)

A snap ring assembly inspection device for inspecting whether or not a pair of snap rings is properly assembled in a piston pin assembly hole of a piston, and is inserted into one side of the piston pin assembly hole. A movable head movable in the axial direction of the piston pin assembly hole, and a snap ring on the other side inserted into the other side of the piston pin assembly hole and inserted into the other side of the piston pin assembly hole A first head that can contact a snap ring on one side assembled to one side of the piston pin assembly hole; A second measuring element that is moved in the axial direction of the piston pin assembly hole with respect to the first measuring element and is brought into contact with one end surface of the piston pin. The contact surface of the measuring element and the contact surface of the second measuring element The axis of the piston pin assembly hole between the first sensor for measuring the axial distance of the piston pin assembly hole and the contact surface of the fixed head and the contact surface of the second probe Based on the second sensor for measuring the distance in the direction, the measurement result of the first sensor, and the measurement result of the second sensor, the pair of snap rings are properly assembled in the piston pin assembly hole. A snap ring assembly inspection device comprising: a determination unit configured to determine whether or not the snap ring is attached.   A snap ring assembly inspection method using the snap ring assembly inspection device according to claim 1, wherein the fixed head is capable of contacting a snap ring assembled on the other side of the piston pin assembly hole. Is inserted into the other side of the piston pin mounting hole, and then the movable head is moved in the axial direction of the piston pin mounting hole to a snap ring mounted on one side of the piston pin mounting hole. The first measuring element capable of contacting is inserted into one side of the piston pin assembly hole, and the second measuring element is brought into contact with one end surface of the piston pin. The distance in the axial direction of the piston pin assembly hole between the contact surface of the child and the contact surface of the second measuring member is measured by the first sensor, and the contact surface of the fixed head and the second surface are measured. The piston pin assembly with the contact surface of the probe The distance in the axial direction of the hole is measured by the second sensor, and the pair of snap rings are formed in the piston pin assembly hole based on the measurement result of the first sensor and the measurement result of the second sensor. An assembly inspection method for a snap ring, wherein whether or not the assembly is properly assembled is determined.

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