JP2020008371A - Master gear, dent inspection device having master gear, and dent inspection method using master gear - Google Patents

Abstract

To provide a master gear which can detect dents in a different regions in a tooth trace direction of an inspected gear without moving the master gear in an axial direction, a dent inspection device having the master gear, and a dent inspection method using the master gear.SOLUTION: In a master gear 20 engaged with an inspected gear 50 in order to inspect the presence or absence of dents of teeth of the inspected gear 50, the master gear 20 has gear teeth of a tooth number which is at least a double or more of a tooth number of the inspected gear 50, a length L1 in an axial direction of an external peripheral region in which the gear teeth are formed is substantially equal to lengths L2 of the teeth of the inspected gear 50 in the axial direction, and a gear missing part 28 in which a part of a region in a tooth trace direction of the gear teeth is continuously missed by at least a tooth number of the inspected gear 50 in a gear peripheral direction is formed in at least one point.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a master gear that engages with a gear to be inspected to perform a dent inspection, a dent inspection device provided with the master gear, and a dent inspection method using the master gear.

  Gears are used in various fields as mechanical elements for transmitting power. In the gear manufacturing process, in general, dents may be formed on the tooth surface during transportation after processing the tooth surface, and such dents may cause abnormal noise or vibration during use. , A dent inspection is performed on the gear.

  Conventionally, as a dent inspection method, there has been known a method of inspecting the presence or absence of a dent by engaging a master gear with a gear to be inspected and detecting a change in an axial distance between the master gear and the gear to be inspected. Have been.

  For example, Patent Document 1 discloses a dent inspection device in which the lengths of gear teeth of a gear to be inspected and a master gear in a tooth trace direction are set to be substantially the same size. A single rotation is made in a state of being engaged with the gear, and the presence or absence of a dent is detected by detecting a change in the center distance between the gear to be inspected and the master gear during rotation.

  Patent Document 2 discloses a dent inspection device in which the length of a gear tooth of a master gear in a tooth trace direction is set shorter than that of a gear to be inspected. In this dent inspection device, a master gear having a short gear tooth is moved in the axial direction of the gear to be inspected with respect to the gear to be inspected, and a change in an axial distance between the gear to be inspected and the master gear is measured. Detects the presence or absence of a dent.

JP-A-4-289427 Japanese Patent Application Laid-Open No. H7-12685

  In general, the gear to be inspected has a slightly changed tooth height in the tooth trace direction so as to absorb a meshing error during use and smoothly transmit power, for example, The height is increased at the center in the tooth trace direction, and is decreased at both ends. On the other hand, in order to cope with various types of gears, the master gear has the same tooth height in the tooth trace direction, and when the master gear and the gear to be inspected mesh with each other, the tooth trace of the gear to be inspected is changed. Are mainly engaged with the gear teeth of the master gear.

  Therefore, the dent inspection device described in Patent Literature 1 inspects a dent having the same size at the center of the gear to be inspected in the tooth trace direction and at the end in the tooth trace direction. In this case, the dent at the center can be detected by hitting the gear teeth of the master gear, but the dent at the end cannot be detected without engaging with the gear teeth of the master gear.

  On the other hand, in the dent inspection device described in Patent Document 2, inspection is performed by moving a master gear having gear teeth shorter in length than the gear to be inspected in the axial direction every time the gear to be inspected makes one rotation. Thus, the end and the center of the gear to be inspected in the tooth trace direction can be separately inspected to detect respective dents.

  However, in the dent inspection device described in Patent Document 2, it is necessary to separately provide a power mechanism for moving the master gear in the axial direction in addition to a power mechanism for rotating the master gear and the gear to be inspected. There has been a problem that the manufacturing cost of the mark inspection apparatus is greatly increased.

  The present invention has been made in view of the above-described problems, and is a master capable of detecting a dent at a different portion in a tooth trace direction of a gear to be inspected without moving the master gear in an axial direction. It is an object of the present invention to provide a gear, a dent inspection device provided with the master gear, and a dent inspection method using the master gear.

  In order to achieve the above object, the master gear according to claim 1 is a master gear that meshes with the gear to be inspected for inspecting the presence or absence of dents on the teeth of the gear to be inspected. The number of gear teeth is at least twice as many as the number of teeth of the inspection gear, and the axial length of the outer peripheral area where the gear teeth are formed is the axial direction of the teeth of the gear to be inspected. At least a part of the gear teeth in the tooth trace direction in the gear trace direction at least as many as the number of teeth of the gear to be inspected in the gear circumferential direction. It is characterized by having one place.

  According to this configuration, when the master gear meshes with the gear to be inspected in the region having the gear missing portion in the circumferential direction of the master gear, the teeth of the gear to be inspected are missing the gear teeth of the master gear. It will be engaged in the existing part without. Accordingly, it is possible to inspect dents at different positions in the tooth trace direction of the gear to be inspected, and when the tooth height of the gear to be inspected changes in the tooth trace direction, the tooth height is changed. The high-profile part and the gear-missing part of the master gear are opposed to avoid meshing, and only the low-gear parts of the gear to be inspected mesh with each other. Inspection can be performed appropriately. In a region where the gear missing portion is not formed in the gear circumferential direction of the master gear, since the teeth of the gear to be inspected mesh with the entire region in the tooth trace direction, the portion where the tooth height is high in the tooth trace direction is used. Also, it is possible to appropriately perform a dent inspection.

  According to a second aspect of the present invention, in the master gear according to the first aspect, the gear teeth are divided into three sections of one end, the center, and the other end at substantially equal intervals in the tooth trace direction. A first inspection region having a gear missing portion in the one end portion and the center region and a gear tooth present in the other end portion; and a division between the center portion and the other end portion. A second inspection region having a gear missing portion in a region and having gear teeth in a segmented region at the one end, and a central portion having a gear missing portion in a segmented region at the one end and the other end. And a third inspection area in which gear teeth are present in the sectioned area in the circumferential direction of the gear.

  According to this configuration, by meshing the gear to be inspected with the master gear in the first, second, and third inspection areas, one end, the center, and the other end in the tooth trace direction of the gear to be inspected are formed. A dent inspection can be individually performed for each of the divided areas.

  According to a third aspect of the present invention, in the master gear according to the second aspect, the second inspection area is located between the first inspection area and the third inspection area in a gear circumferential direction. It is characterized by being located in.

  According to this configuration, the engagement between the gear to be inspected and the master gear is changed from the divided region at one end (or the other end) in the tooth trace direction to the other end (or Since it moves to the segmented area (one end), the master gear and the gear to be inspected can smoothly mesh without interruption in the tooth trace direction.

  According to a fourth aspect of the present invention, in the master gear according to the second or third aspect, the master gear has an inspection section area in which the entire circumference of the master gear is divided into a plurality of sections at equal intervals. It has the first, second and third inspection areas.

  According to this configuration, the gear to be inspected meshes with one inspection division area in the gear circumferential direction of the master gear, so that the one end, the central part, and the other end of the gear to be inspected in the tooth trace direction are respectively formed. A dent inspection can be performed for. Since the master gear has a plurality of such inspection division regions in the circumferential direction of the gear, it is possible to perform dent inspection of a plurality of gears to be inspected while rotating the master gear once.

  An invention according to claim 5 is a dent inspection device provided with the master gear according to any one of claims 1 to 4, wherein the master gear is meshed with a gear to be inspected, It is characterized in that the presence or absence of dents on the teeth of the gear to be inspected is inspected.

  According to this configuration, when the master gear meshes with the gear to be inspected in the region having the gear missing portion in the circumferential direction of the master gear, the teeth of the gear to be inspected are missing the gear teeth of the master gear. It will be engaged in the existing part without. This makes it possible to inspect dents at different positions in the tooth trace direction of the gear to be inspected.

  Further, the invention according to claim 6 is a dent inspection method for inspecting the presence or absence of dents on the teeth of the gear to be inspected by meshing the gear to be inspected with the master gear and the gear to be inspected, An inspecting step of rotating the inspected gear at least two times while the inspected gear meshes with the master gear, wherein the master gear is at least twice as many as the number of teeth of the inspected gear. The number of gear teeth, the axial length of the outer peripheral area where the gear teeth are formed is substantially equal to the axial length of the teeth of the gear to be inspected, At least one gear missing portion is formed by continuously cutting at least a part of the tooth in the tooth trace direction in the gear circumferential direction by at least the number of teeth of the gear to be inspected. The inspection gear passes through the area having the gear missing portion. Characterized by rotating.

  According to this configuration, when the master gear meshes with the gear to be inspected in the region having the gear missing portion in the circumferential direction of the master gear, the teeth of the gear to be inspected are missing the gear teeth of the master gear. It will be engaged in the existing part without. This makes it possible to inspect dents at different positions in the tooth trace direction of the gear to be inspected.

  According to a seventh aspect of the present invention, in the dent inspection method according to the sixth aspect, the master gear includes one end, a center portion, and the other end at substantially equal intervals in the tooth trace direction. A first inspection area having a gear missing portion in the one end portion and the central portion, and having a gear tooth in the other end portion; A second inspection area having a gear missing portion in the divided area of the other end and having a gear tooth in the divided area of the one end, and a gear missing part in the divided area of the one end and the other end. And a third inspection area in which gear teeth are present in the central section area in the circumferential direction of the gear, and passes through the first, second, and third inspection areas in the inspection step. It is characterized by three rotations.

  According to this configuration, it is possible to individually perform the dent inspection on each of the divided regions of the one end, the center, and the other end of the gear to be inspected in the tooth trace direction.

  ADVANTAGE OF THE INVENTION According to the master gear which concerns on this invention, the dent inspection apparatus provided with this master gear, and the dent inspection method using this master gear, the dent which exists in a different part in the tooth trace direction of the to-be-inspected gear is detected. It is possible to suppress an increase in the manufacturing cost of the dent inspection device.

FIG. 1 is an explanatory view of a dent inspection device provided with a master gear according to a first embodiment of the present invention. The perspective view of a master gear. The top view of the master gear shown in FIG. FIG. 3 is a diagram illustrating a meshing state between a master gear and a gear to be inspected. FIG. 7 is a perspective view of a master gear according to a second embodiment of the present invention. FIG. 6 is a plan view of the master gear shown in FIG. 5. FIG. 13 is a perspective view of a master gear according to a third embodiment of the present invention. FIG. 8 is a plan view of the master gear shown in FIG. 7.

(First Embodiment)
FIG. 1 is an explanatory view of a dent inspection device 10 including a master gear according to a first embodiment of the present invention. FIG. 2 is a perspective view of the master gear 20, and FIG. FIG. The master gear 20 according to the present invention is mounted on the dent inspection device 10 and meshes with a gear to be inspected (hereinafter referred to as an inspection gear 50) to form the master gear 20 and the inspection gear 50. The presence or absence of a dent is inspected by detecting a change in the distance between the axes.

  The dent inspection device 10 includes a base 11 serving as a base of the dent inspection device 10, a master gear 20, a support shaft 12 on which the master gear 20 is mounted, and an inspection gear support on which the gear 50 to be inspected is mounted. It includes a shaft 13, a rotational displacement detecting unit 14, a slide unit 15, a biasing unit 16, a displacement sensor 17, and a control unit 18.

  The support shaft 12 is rotated by a driving device (not shown), and the master gear 20 is rotated with the rotation of the support shaft 12. Rotational displacement detection means 14 is connected to a lower portion of the support shaft 12. The rotational displacement detecting means 14 is constituted by, for example, a rotary encoder, and detects the number of rotations and the amount of rotation (angle) of the master gear 20. The detection signal from the rotational displacement detection means 14 is input to the control unit 18.

  The inspection gear support shaft 13 is arranged parallel to the support shaft 12, and the inspection gear 50 is rotatably supported by the inspection gear support shaft 13.

  The support shaft 12 and the rotational displacement amount detecting means 14 are erected on a slide unit 15. The slide unit 15 is configured to be slidable on a slide base 11 a fixed to the base 11 in a direction in which the axial center distance of the support shaft 12 and the inspection gear support shaft 13 approaches and separates. The biasing unit 16 is, for example, a spring that applies a biasing force, and biases the slide unit 15 in a direction in which the support shaft 12 approaches the inspection gear support shaft 13.

  The displacement sensor 17 detects the distance between the master gear 20 and the gear 50 to be inspected, and is attached to a holder 19 that holds the inspection gear support shaft 13. The detection signal of the displacement sensor 17 is input to the control unit 18.

  The control unit 18 is, for example, an electronic control unit including a microcomputer including an information processing unit such as a CPU, a storage unit such as a RAM and a ROM, and an input / output interface. Based on the detection result of the sensor 17, the presence or absence of a dent of the inspection gear 50 is detected.

  Each of the master gear 20 and the inspection gear 50 is detachable with respect to each of the support shaft 12 and the inspection gear support shaft 13. 20 is replaced.

  The gear 50 to be inspected is, for example, a gear used for a transmission of a vehicle such as an automobile, and in the present embodiment, the height of the teeth of the gear 50 to be inspected is such that the central portion in the tooth trace direction has both ends. (For example, about 5 μm to 20 μm higher at the center than at both ends).

  The master gear 20 is fixed to the support shaft 12 and rotates together with the support shaft 12. As shown in FIG. 2, the master gear 20 and the inspection gear 50 are formed such that the axial lengths L1 and L2 of the outer peripheral region where the gear teeth are formed are substantially equal. The number of teeth of the master gear 20 is at least twice or more the number of teeth of the gear 50 to be inspected, and has three times the number of teeth in the present embodiment. The height of the gear teeth of the master gear 20 is set equal in the tooth trace direction.

  The master gear 20 has at least one gear missing portion 28 in which a part of the gear teeth in the tooth trace direction is continuously missing in the gear circumferential direction by at least the number of teeth of the gear 50 to be inspected. In the present embodiment, two gear missing portions 28 are provided, and each region where the gear missing portion 28 is formed in the gear circumferential direction is a different portion in the tooth trace direction of the tooth of the gear 50 to be inspected. A first inspection area 25A and a second inspection area 25B for inspecting the data are formed.

  The first and second inspection areas 25A and 25B are provided such that the gear teeth of the master gear 20 are divided into a plurality of sections in the tooth trace direction so that the gear teeth exist only in one section area. This is an area where a part of the teeth is missing, and the length of each of the inspection areas 25A and 25B in the gear circumferential direction is such that the number of teeth of the master gear 20 and the gear 50 to be inspected is the same or the master gear 20 has a smaller number. The length is set to be equal to the entire circumference of the gear 50 to be inspected.

  The first inspection area 25 </ b> A is provided between the upper area 21 on one end side in the tooth trace direction, the lower area 22 on the other end side, and the upper and lower areas 21 and 22. The central area 23 is an inspection area in which the lower and central areas 22 and 23 have a gear missing portion 28 and the upper area 21 has gear teeth. The second inspection area 25 </ b> B is an inspection area having the gear missing portions 28 in the upper and center regions 21 and 23 and the gear teeth in the lower region 22. In the present embodiment, the axial lengths of the upper, lower, and central portions 21, 22, and 23 are set to substantially the same length, but may be set to different lengths.

  In the gear circumferential direction, between the first inspection area 25A and the second inspection area 25B, normal inspection areas 27-1 and 27-2 in which the gear missing portions 28 are not formed are provided, respectively. . In the present embodiment, the gear 50 to be inspected passes through the normal inspection areas 27-1 and 27-2 divided into two so that all the teeth of the gear 50 to be inspected mesh with the normal inspection area 27. The number of teeth in each of the normal inspection areas 27-1 and 27-2 is set to half the number of teeth of the inspection gear 50.

  Next, a method for inspecting a dent of the inspection gear 50 using the above-described master gear 20 will be described.

  First, the master gear 20 and the inspection gear 50 are respectively mounted on the support shaft 12 and the inspection gear support shaft 13 of the dent inspection device 10. Next, the gears 20 and 50 are engaged with each other, and the driving shaft rotates the support shaft 12 to rotate the master gear 20 and the inspection gear 50, thereby performing a dent inspection (inspection step). In the following description, the first inspection area 25A, the normal inspection area 27-1, the second inspection area 25B, and the normal inspection area of the master gear 20 in a state where the inspection gear 50 meshes with the master gear 20. The state of passing through each inspection area in the order of 27-2 will be described.

  First, the inspection gear 50 makes one rotation while passing through the first inspection area 25A. During this time, as shown in FIG. 4A, the gear 50 to be inspected has an upper region among three divided regions in the tooth trace direction, namely, an upper region 51, a central region 53, and a lower region 52. Only the tooth 51 meshes with the master gear 20. Thereby, the dent inspection device 10 can perform the dent inspection of only the upper region 51 of the teeth of the gear 50 to be inspected.

  Next, while the inspection gear 50 passes through the normal inspection area 27-1, the inspection gear 50 includes the upper area 51, the lower area 52, and the central area 53, as shown in FIG. The teeth make a half turn while meshing with the master gear 20. At this time, a dent inspection is mainly performed on the central region 53 where the height of the teeth of the inspection gear 50 is higher than the upper region 51 and the lower region 52.

  Next, the gear 50 to be inspected makes one rotation after passing through the second inspection area 25A. During this time, as shown in FIG. 4C, only the teeth of the lower region 52 of the test gear 50 mesh with the master gear 20. Thus, the dent inspection device can perform the dent inspection of only the lower region 52 of the teeth of the gear 50 to be inspected.

  While the gear 50 to be inspected passes through the normal inspection area 27-2, as shown in FIG. 4B, the gear 50 to be inspected has the upper region 51, the lower region 52, and the central region 53 having the master teeth. The gear rotates half while meshing with the gear 20, and the remaining half of the teeth that do not mesh in the normal inspection area 27-1 mesh with the master gear 20 in the circumferential direction of the gear. At this time, a dent inspection is mainly performed on the central region 53 where the height of the teeth of the inspection gear 50 is higher than the upper region 51 and the lower region 52.

  As described above, while the master gear 20 makes one rotation, the inspection gear 50 makes three rotations, and the first inspection area 25A, the normal inspection areas 27-1, 27-2, and the second inspection area 25A of the master gear 20. Can be inspected by passing through the inspection area 25B. In particular, the formation of the gear missing portion 28 on the master gear 20 allows the master gear 20 to be connected to the inspection gear 50. On the other hand, without moving in the axial direction, it is possible to individually perform the dent inspection of the upper region 51 and the lower region 52 where the height of the teeth is reduced in the tooth trace direction of the gear 50 to be inspected. In addition, in the normal inspection areas 27-1 and 27-2 of the master gear 20, the teeth of the gear 50 to be inspected mesh with each other in the tooth trace direction, so that a portion having a high tooth height in the tooth trace direction is also used. The dent inspection can be appropriately performed.

  The dent inspection of the inspection gear 50 may be started from any position of the master gear 20 in the gear circumferential direction, and the inspection gear 50 meshes with the master gear 20 and makes three rotations to form a tooth trace. The dent inspection of each of the divided areas 21, 22, 23 in the direction is completed.

(Second embodiment)
Next, a master gear 30 according to a second embodiment of the present invention will be described with reference to FIGS. Note that the dent inspecting device to which the master gear 30 of the present embodiment is attached and the inspected gear that meshes with the master gear 30 are the dent inspecting device 10 and the inspected gear described in the first embodiment. Since the configuration is the same as 50, the description thereof is omitted here.

  The master gear 30 is fixed to the support shaft 12 of the dent inspection device 10 and rotates together with the support shaft 12. The master gear 30 and the test gear 50 are formed such that the axial lengths L3 and L2 of the outer peripheral region where the gear teeth are formed are substantially equal. The number of teeth of the master gear 30 is about nine times the number of teeth of the gear 50 to be inspected. The height of the gear teeth of the master gear 30 is set equal in the tooth trace direction.

  The master gear 30 is provided with a plurality of gear missing portions 38 in which a part of the gear teeth in the tooth trace direction is continuously removed in the gear circumferential direction by at least the number of teeth of the gear 50 to be inspected. Each of the regions where the gear missing portion 38 is formed in the gear circumferential direction includes a first inspection region 35A, a second inspection region 35B, and a third inspection region 35 that inspect different portions in the tooth trace direction of the teeth of the gear 50 to be inspected. An inspection area 35C is formed.

  The first inspection area 35A is configured such that the gear teeth of the master gear 30 are connected to the upper area 31 on one end side in the tooth trace direction, the lower area 32 on the other end side, and the upper and lower areas 31 and 32. Of the three divided regions of the central region 33 having substantially the same length as the central region 33, the lower and central regions 32 and 33 have a gear missing portion 38 and the upper region 31 has a gear tooth. is there. The second inspection area 35B is an inspection area having a gear missing portion 38 in the upper and central regions 31 and 33 and a gear tooth in the lower region 32. The third inspection area 35C is an inspection area in which the upper and lower regions 31 and 32 have the gear missing portions 38 and the central region 33 has gear teeth. The length of each of the inspection areas 35A, 35B, 35C in the gear circumferential direction is set such that the number of teeth of the master gear 30 and the number of teeth of the inspection gear 50 are the same or the number of the master gear 30 is slightly larger. The length is set to be equal to the entire circumference of 50.

  The master gear 30 further has first, second, and third inspection division areas 39A, 39B, and 39C in which the entire circumference is divided into three at equal intervals, and each inspection division area 39A, 39B, and 39C has Each of the first, second, and third inspection areas 35A, 35B, and 35C has one inspection area. In the illustrated example, in each of the inspection division areas 39A, 39B, and 39C, each of the inspection areas 35A, 35B, and 35C is clockwise turned into a first inspection area 35A, a third inspection area 35C, and a second inspection area 35B. Are arranged in this order, but the order is not limited thereto, and can be set as appropriate.

  Next, a method of inspecting a dent of the gear 50 to be inspected using the above-described master gear 30 will be described.

  First, the master gear 30 and the inspection gear 50 are mounted on the support shaft 12 and the inspection gear support shaft 13 of the dent inspection device 10, respectively. A dent inspection is performed by rotating the support shaft 12 to rotate the master gear 30 and the inspection gear 50 (inspection step). In the following description, the first inspection area 35A, the third inspection area 35C, and the second inspection area 35A in the first inspection section area 39A of the master gear 30 in a state where the inspection gear 50 meshes with the master gear 30. The state of passing through each inspection area in the order of the inspection area 35B will be described.

  First, the gear to be inspected 50 makes one rotation while passing through the first inspection area 35A. During this time, the gear to be inspected 50 moves the teeth in the direction of the tooth trace in the upper area 51, the central area 53, and the lower area. Only the teeth of the upper region 51 of the three divided regions 52 mesh with the master gear 30. Thereby, the dent inspection device 10 can perform the dent inspection of only the upper region 51 of the teeth of the gear 50 to be inspected.

  Further, the gear 50 to be inspected makes one rotation while passing through the third inspection area 35C. During this time, the gear 50 to be inspected engages with the master gear 30 only in the teeth of the central region 53. . Thereby, the dent inspection device 10 can perform the dent inspection of only the central region 52 of the teeth of the gear 50 to be inspected.

  Further, the gear 50 to be inspected makes one rotation while passing through the second inspection area 35B, and during this time, only the teeth of the lower region 52 of the gear 50 to be inspected mesh with the master gear 30. Thereby, the dent inspection device 10 can perform the dent inspection of only the lower region 52 of the teeth of the gear 50 to be inspected.

  As described above, in the dent inspection method according to the present embodiment, the inspection gear 50 makes three rotations and passes through one inspection section area 39A of the master gear 30, so that the upper part of the inspection gear 50 , And the lower and center regions 51, 52, and 53 can be individually subjected to dent inspection. Further, since three inspection division areas 39A, 39B, and 39C are formed in the master gear 30, it is possible to perform a dent inspection on the three inspection gears while the master gear 30 makes one rotation. It is.

(Third embodiment)
Next, a master gear 40 according to a third embodiment of the present invention will be described with reference to FIGS. Note that the dent inspecting device to which the master gear 40 of the present embodiment is attached and the inspected gear that meshes with the master gear 40 are the dent inspecting device 10 and the inspected gear described in the first embodiment. Since the configuration is the same as 50, the description thereof is omitted here.

  The master gear 40 is fixed to the support shaft 12 of the dent inspection device 10 and rotates together with the support shaft 12. The master gear 40 and the inspection gear 50 are formed such that the axial lengths L4 and L2 of the outer peripheral region where the gear teeth are formed are substantially equal. The height of the gear teeth of the master gear 40 is set equal in the tooth trace direction.

  The master gear 40 is provided with a plurality of gear missing portions 48 in which a part of the gear teeth in the tooth trace direction is continuously missing in the gear circumferential direction by at least the number of teeth of the gear 50 to be inspected. Each of the regions where the gear missing portion 48 is formed in the gear circumferential direction includes a first inspection region 45A, a second inspection region 45B, and a third inspection region 45 for inspecting different portions in the tooth trace direction of the teeth of the gear 50 to be inspected. An inspection area 45C is formed.

  The first inspection area 45 </ b> A is formed by dividing the gear teeth of the master gear 40 into three parts, that is, an upper area 41, a lower area 42, and a central area 43 in the tooth trace direction at almost the same length. This is an inspection area having a gear missing portion 48 in the lower and central regions 42 and 43 and having gear teeth in the upper region 41. The second inspection area 45B is an inspection area having a gear missing portion 48 in the upper and central regions 41 and 43 and having gear teeth in the lower region 42. The third inspection area 45C is an inspection area in which the upper and lower regions 41 and 42 have the gear missing portions 48 and the central region 43 has gear teeth. The length of each of the inspection areas 45A, 45B, and 45C in the gear circumferential direction is set so that the number of teeth of the master gear 30 and the number of teeth of the inspection gear 50 are the same or the number of the master gear 30 is slightly larger. The length is set to be equal to the entire circumference of 50.

  As shown in FIG. 8, the master gear 40 further has first, second, third, and fourth inspection division regions 49A, 49B, 49C, and 49D whose entire circumference is divided into four at equal intervals. Each inspection section area 49A, 49B, 49C, 49D has one first, second, and third inspection area 45A, 45B, 45C. In each inspection section area 49A, 49B, 49C, 49D, the third inspection area 45C is located between the first inspection area 45A and the second inspection area 45B in the gear circumferential direction. Further, the inspection section areas 49A, 49B, 49C, 49D adjacent in the gear circumferential direction are arranged such that the first inspection area 45A or the second inspection area 45B is continuous. That is, the first inspection area 45A and the second inspection area 45B that are continuous in the circumferential direction each have approximately twice the number of teeth of the gear 50 to be inspected.

  Next, a method of inspecting a dent of the inspection gear 50 using the above-described master gear 40 will be described.

  First, the master gear 40 and the inspection gear 50 are mounted on the support shaft 12 and the inspection gear support shaft 13 of the dent inspection device 10, respectively. A dent inspection is performed by rotating the support shaft 12 to rotate the master gear 40 and the inspection gear 50 (inspection step). In the following description, the first inspection area 35A, the third inspection area 35C, and the second inspection area 35A in the first inspection section area 49A of the master gear 30 in a state where the inspection gear 50 is engaged with the master gear 40. The state of passing through each inspection area in the order of the inspection area 35B will be described.

  First, the gear 50 to be inspected makes one rotation while passing through the first inspection area 45A. During this time, the gear 50 to be inspected moves the teeth in the direction of the tooth trace in the upper region 51, the central region 53, and the lower region. Only the teeth of the upper region 51 of the three divided regions 52 mesh with the master gear 30. Thereby, the dent inspection device 10 can perform the dent inspection of only the upper region 51 of the teeth of the gear 50 to be inspected.

  Further, the gear 50 to be inspected makes one rotation while passing through the third inspection area 45C. During this time, the gear 50 to be inspected is such that only the teeth of the central area 53 mesh with the master gear 40. . Thereby, the dent inspection device 10 can perform the dent inspection of only the central region 52 of the teeth of the gear 50 to be inspected.

  Further, the gear 50 to be inspected makes one rotation while passing through the second inspection area 45B. During this time, only the teeth of the lower area 52 of the gear 50 to be inspected mesh with the master gear 40. Thereby, the dent inspection device 10 can perform the dent inspection of only the lower region 52 of the teeth of the gear 50 to be inspected.

  As described above, in the dent inspection method of the present embodiment, the inspection gear 50 makes three rotations and passes through one inspection section area 39A of the master gear 40, so that the upper part of the inspection gear 50 , And the lower and center regions 51, 52, and 53 can be individually subjected to dent inspection. Further, since the master gear 40 has four inspection division areas 49A, 49B, 49C, and 49D, it is necessary to perform the dent inspection on the four inspection gears while the master gear 40 makes one rotation. Is possible.

  The engagement between the master gear 40 and the inspection gear 50 moves in the tooth trace direction from the upper region 41 to the lower region 42 via the central region 43, or from the lower region 42 to the central region. Since it moves to the upper region 41 via 43, the engagement is smoothly performed without interruption when moving to a different region. In particular, as shown in FIG. 7, gear teeth extending from the upper region 41 to the central region 43 are provided between the first inspection region 45 </ b> A and the third inspection region 45 </ b> C adjacent in the circumferential direction of the master gear 40, By providing gear teeth extending from the central area 43 to the lower area 42 between the third inspection area 45C and the second inspection area 45B which are adjacent in the circumferential direction, the transition to each inspection area becomes smoother. .

  The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the invention.

REFERENCE SIGNS LIST 10 dent inspection device 11 base 12 support shaft 13 inspection gear support shaft 14 rotational displacement detection means 15 slide unit 16 biasing means 17 displacement sensor 18 control unit 20, 30, 40 master gear 21, 31, 41 upper region 22, 32, 42 Lower area 23, 33, 43 Central area 25A, 35A, 45A First inspection area 25B, 35B, 45B Second inspection area 27 Normal inspection area 35C, 45C Third inspection area

Claims (7)

A master gear that meshes with the gear to be inspected to inspect for the presence or absence of dents in the teeth of the gear to be inspected,
Having gear teeth of at least twice the number of teeth of the gear to be inspected,
The axial length of the outer peripheral region where the gear teeth are formed is substantially the same as the axial length of the teeth of the gear to be inspected,
A master gear having at least one gear missing portion in which a part of the gear teeth in the tooth trace direction is continuously removed in the gear circumferential direction by at least the number of teeth of the gear to be inspected.   One of the three divided areas of the gear teeth in the direction of the tooth traces at one end, the central part and the other end at substantially equal intervals, the central part and the other end have a gear missing part in the divided area. A first inspection area in which gear teeth are present in the divided area of the one end, and a gear missing part in the divided area of the one end and the central part, and gear teeth are present in the divided area of the other end. A second inspection area and a third inspection area having a gear missing portion in the divided region of the one end and the other end and having a gear tooth in the divided region of the central portion are provided in the gear circumferential direction. The master gear according to claim 1, wherein:   The master gear according to claim 2, wherein the second inspection area is located between the first inspection area and the third inspection area in a gear circumferential direction. It has an inspection division area in which the entire circumference of the master gear is divided into a plurality at equal intervals,
4. The master gear according to claim 2, wherein each inspection section has the first, second, and third inspection areas.   A dent inspection device comprising the master gear according to any one of claims 1 to 4, wherein the master gear meshes with the gear to be inspected to inspect the teeth of the gear to be inspected for dents. A dent inspection method for engaging a gear to be inspected with a gear to be inspected to a master gear and inspecting the presence of dents in the teeth of the gear to be inspected,
Inspection step of rotating the inspected gear at least two times while the inspected gear meshes with the master gear,
The master gear is
Having gear teeth of at least twice the number of teeth of the gear to be inspected,
The axial length of the outer peripheral region where the gear teeth are formed is substantially the same as the axial length of the teeth of the gear to be inspected,
At least one gear missing portion in which a part of the gear tooth in the tooth trace direction is continuously removed in the gear circumferential direction by at least the number of teeth of the gear to be inspected,
In the inspection step, the inspection gear rotates so as to pass through a region having the gear missing portion. In the master gear, a gear missing in the central area and the other end area among the divided areas in which the gear teeth are divided into three parts at one end, the center and the other end at substantially equal intervals in the tooth trace direction. A first inspection area in which a gear tooth is present in the divided area of the one end and a gear missing part in the divided area of the one end and the central part, and A second inspection area where gear teeth are present, a third inspection area having a gear missing portion in the one end portion and the other end portion and having a gear missing portion in the central portion, and In the circumferential direction of the gear,
7. The dent inspection method according to claim 6, wherein in the inspection step, three rotations are made to pass through the first, second, and third inspection areas.

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