Position detection device

Abstract

To provide a position detecting device configured so that a positional relation between an insertion part provided in a workpiece and a holding part of an inserting device can be adjusted accurately.SOLUTION: A position detecting device 10 comprises an index part 20 installed as an index of a position which an insertion part provided in a workpiece is assumed to come, and a mounting part 30 which is mounted on a holding part 220 of an inserting device 210. The mounting part 30 has a first assembled part 40 that is assembled to the holding part 220, a second assembled part 50 that is inserted into the first assembled part 40, a support shaft part 60, a holder part 90 and a tester part 100. A first inner peripheral surface 40a is formed in a taper shape which spreads from a depth side in an inserting direction of the second assembled part 50 toward a front side thereof. An outer peripheral surface of the second assembled part 50 is formed in a taper shape which spreads from a head side in a direction in which the part is inserted into the first assembled part 40 toward a front side thereof.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a position detection device.

Background Art

[0002] Conventionally, there is an insertion device used for inserting an insert to be inserted into an insertion portion formed in a workpiece, such as the valve guide press-fitting device described in Patent Document 1. The valve guide press-fitting device of Patent Document 1 is used for inserting a valve guide as an insert into an insertion portion for a valve guide formed in a cylinder head of an engine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, in a device such as the above-described valve guide press-fitting device, the positional relationship between the insertion portion provided in a workpiece such as a cylinder head and the holding portion for holding an insert such as a valve guide must be accurately adjusted and alignment (centering) must be performed.

[0005] Therefore, the inventors considered preparing a position detection device to accurately adjust the positional relationship between the part to be inserted on a workpiece and the holding part on an insertion device, and performing alignment (centering) of the two based on the positional relationship between the part to be inserted and the holding part obtained by the position detection device. Specifically, as shown in Figure 6, the inventors considered a position detection device 200 comprising a mounting part 230 that can be attached to the holding part 220 of the insertion device 210, and a shaft part 240 that is provided at a position where the part to be inserted is expected to arrive when the workpiece is placed in a predetermined position. In this position detection device 200, the mounting part 230 comprises a holder shaft 250 that can be fitted into the holding part 220, and a holder part 260 that is rotatably provided with respect to the holder shaft 250, and a tester part 270 consisting of a pick tester is provided on the holder part 260.

[0006] When the inventors investigated the above-described position detection device 200, they found that the presence of play formed between the holding portion 220 and the holder shaft 250, and play formed between the holder shaft and the holder portion 260, affects the adjustment accuracy of the positional relationship between the shaft portion 240, which is provided as a representation of the part to be inserted, and the holding portion 220.

[0007] Therefore, the present invention aims to realize a position detection device that can accurately adjust the positional relationship between the part to be inserted into the workpiece and the holding part of the insertion device. [Means for solving the problem]

[0008] (1) The position detection device of the present invention, provided to solve the above-mentioned problems, includes an insertion device capable of inserting an insert into an insertion portion formed in a workpiece so as to extend in a first direction, and the Inserted partA position detection device used to adjust the positional relationship between the insert and the insert, comprising: an indicator portion installed as an indicator of the insertion position in which the insert is inserted into the insertable portion, or the position of a holding portion provided on the insertion device capable of inserting and holding the insertable portion; and a mounting portion attached to the insertion device or the insertable portion, wherein the indicator portion has a shaft portion that is provided so as to extend in the first direction and whose axial position coincides with the insertable portion installed at the insertion position, or the holding portion provided on the insertion device capable of inserting and holding the insertable portion; and the mounting portion comprises a first assembly portion assembled along the inner circumferential surface of the holding portion or the inner circumferential surface of the insertable portion, and an inner space surrounded by the first inner circumferential surface forming the inner circumference of the first assembly portion, which is inserted toward the first direction. The device comprises a second assembly portion, a support shaft portion formed such that its axial position and first direction coincide with the second assembly portion, a holder portion provided on the support shaft portion so as to be rotatable about the axial position of the support shaft portion, and a tester portion held by the holder portion. The device is characterized in that, when the first assembly portion and the second assembly portion are assembled to the holding portion or the portion to be inserted, the holder portion is rotated relative to the support shaft portion and the tester portion is moved around the shaft portion, thereby enabling the detection of the positional relationship between the insert formed in the workpiece and the insertion device. The first assembly portion is tapered so as to widen from the back to the front in the insertion direction, so that the first inner surface of the first assembly portion and the outer surface of the second assembly portion meet.

[0009] The position detection device of the present invention allows the mounting portion to be attached to a holding portion or an inserted portion by inserting the second mounting portion into an assembly space formed inside the first mounting portion, which is assembled along the inner circumferential surface of the holding portion or the inner circumferential surface of the inserted portion. Furthermore, the first inner circumferential surface, which forms the inner circumference of the first mounting portion, is tapered so as to widen from the back to the front in the insertion direction when the second mounting portion is inserted into the assembly space. Furthermore, the outer circumferential surface of the second mounting portion is tapered so as to widen from the front to the front in the insertion direction into the first mounting portion.Therefore, the position detection device of the present invention allows the mounting portion to be attached to a holding portion or an inserted portion while suppressing the occurrence of gaps that cause looseness between the mounting portion and the holding portion by assembling the second mounting portion to the first mounting portion.Consequently, the position detection device of the present invention suppresses the occurrence of looseness caused by gaps formed between the first mounting portion and the second mounting portion, and can accurately adjust the positional relationship between the inserted portion provided on the workpiece and the holding portion of the insertion device.

[0010] (2) The position detection device of the present invention has a mounting portion which, when the second assembly portion is inserted into the first assembly portion, presses at least one of the first assembly portion and the second assembly portion from the back side to the front side in the insertion direction, and a through hole that penetrates the second assembly portion so as to extend in the first direction, wherein the pressing force mechanism has a first pressing portion which abuts the first assembly portion on the back side in the insertion direction, and an operating shaft which extends from the back side to the front side in the insertion direction through the through hole, and the operating It is preferable that the assembly has a second pressing portion connected to the working shaft and contacting the first pressing portion from the rear side in the insertion direction, and that by operating the operating shaft from the front side in the insertion direction of the second assembly, the second pressing portion is moved in the axial direction of the operating shaft, thereby applying a pressing force from the second pressing portion to the first pressing portion, and also applying a pressing force from the first pressing portion to the first assembly portion in the direction from the rear side in the insertion direction of the second assembly portion toward the front side.

[0011] The position detection device of the present invention, by having the configuration described in (2) above, can press the first assembly part against the second assembly part by a pressing force mechanism when the second assembly part is inserted into the first assembly part. As a result, the position detection device of the present invention can attach the mounting part to the holding part while minimizing the gap formed between the first assembly part and the second assembly part. Therefore, the position detection device of the present invention can suppress the occurrence of looseness caused by the gap formed between the first assembly part and the second assembly part, and can adjust the positional relationship between the inserted part and the holding part with high precision.

[0012] The position detection device of the present invention, by having the configuration described in (2) above, allows the operating shaft inserted through the through hole to be operated from the front side in the insertion direction of the second assembly part, and the pressing part to be moved from the back side in the insertion direction of the second assembly part to the front side, thereby applying a pressing force to the first assembly part and pressing the first assembly part against the second assembly part. As a result, the position detection device of the present invention can attach the mounting part to the holding part while minimizing the gap formed between the first assembly part and the second assembly part. Therefore, the position detection device of the present invention can suppress the occurrence of looseness caused by the gap formed between the first assembly part and the second assembly part, and can adjust the positional relationship between the part to be inserted and the holding part with high precision.

[0013] (3) The position detection device of the present invention preferably has a part or all of the operating shaft made up of a screw shaft, a part or all of the through hole made up of a screw hole, the screw shaft that forms the operating shaft and the screw hole that forms the through hole are screwed together, and by rotating the operating shaft, the contact portion can be moved in a direction from the back side to the front side in the insertion direction of the second assembly portion.

[0014] With this configuration, the position detection device of the present invention makes it possible to move the pressing part from the back side to the front side in the insertion direction of the second assembly part by rotating the operating shaft inserted through the through hole from the front side in the insertion direction of the second assembly part, thereby applying a pressing force to the first assembly part.

[0015] (4) The position detection device of the present invention is preferably such that the first assembly part can be expanded in a second direction intersecting the first direction by applying a pressing force in the first direction.

[0016] By configuring the position detection device of the present invention in this way, a pressing force is applied to the first assembly part, causing the second assembly part to move from the back side in the insertion direction to the front side. This allows the first assembly part to expand in the second direction along the outer circumferential surface of the second assembly part and come into close contact with it. As a result, the position detection device of the present invention can attach the mounting part to the holding part with virtually no gap formed between the first assembly part and the second assembly part. Therefore, the position detection device of the present invention can suppress the occurrence of looseness caused by the gap formed between the first assembly part and the second assembly part, and can adjust the positional relationship between the part to be inserted and the holding part with high precision.

[0017] (5) The position detection device of the present invention is preferably such that the holder portion is rotatably supported with respect to the support shaft portion via a bearing.

[0018] By having this configuration, the position detection device of the present invention allows the holder portion to rotate smoothly with respect to the support shaft portion without rattling. As a result, the position detection device of the present invention can suppress the decrease in positional accuracy caused by the formation of a gap between the holder portion and the support shaft portion. As a result, the position detection device of the present invention can adjust the positional relationship between the inserted portion and the holding portion with high precision.

[0019] (6) The position detection device of the present invention preferably has a tester section which is composed of a pick tester and can adjust the axial position of the shaft by rotating while in contact with the outer circumferential surface of the shaft.

[0020] The position detection device of the present invention, with this configuration, can accurately adjust the positional relationship between the shaft portion, which is provided as the part to be inserted, and the holding portion. This allows for accurate adjustment of the positional relationship between the part to be inserted and the holding portion when the workpiece is placed in a predetermined position.

[0021] (7) The position detection device of the present invention is characterized in that the workpiece is the cylinder head of an engine, the insert is a valve guide, and the inserted portion is an insertion hole for inserting the valve guide.

[0022] With such a configuration, the position detection device of the present invention can smoothly and accurately adjust the position of the insertion device in preparation for assembling the valve guide to the cylinder head of the engine. As a result, the position detection device of the present invention can achieve effects such as improving the reliability of the insertion device, improving the product quality of the engine assembled using the insertion device, and significantly shortening the time required for the centering operation of the insertion device.

Effect of the Invention

[0023] According to the present invention, a position detection device that solves the above problems can be provided.

Brief Description of the Drawings

[0024] [Figure 1] It is a side cross-sectional view showing a state where the position detection device according to an embodiment of the present invention is attached to an insertion device. [Figure 2] It is a side cross-sectional view showing a state where the mounting portion constituting the position detection device of FIG. 1 is attached to the insertion device. [Figure 3] (a) is a cross-sectional view of the first assembling portion, and (b) is a bottom view of the first assembling portion. [Figure 4] (a) is a plan view showing an integrated structure of the second assembling portion, the intermediate portion, and the support shaft portion, and (b) is a side view thereof. [Figure 5] (a) is a cross-sectional view of a component constituting the holder portion, and (b) is a bottom view thereof. [Figure 6] It is a side cross-sectional view showing a state where the position detection device prototyped by the present inventors is attached to the insertion device.

Mode for Carrying Out the Invention

[0025] The position detection device 10 according to one embodiment of the present invention will be described in detail below with reference to the drawings. In the following description, unless otherwise specified, positional relationships such as up, down, left, and right will be described based on the normal operating conditions. In addition, the insertion device 210, etc. will be described before describing the position detection device 10.

[0026] The insertion device 210 is used to insert a valve guide (insertion) into a valve guide insertion hole (insertion part) provided in the cylinder head of an engine, which is used as the workpiece. As shown in Figure 1, the insertion device 210 has a holding part 220 for holding the valve guide, which is the insertion part. Specifically, the insertion device 210 is provided with a hole in the holding part 220 for mounting a component (punch) that holds the valve guide. The holding part 220 is a concave portion that opens downwards. The insertion device 210 is equipped with a drive mechanism (not shown) for applying a thrust force in the axial direction (first direction / up and down direction in this embodiment) to the valve guide set in the holding part 220. When assembling the valve guide to the insertion part provided in the cylinder head, it is necessary to perform a centering operation in advance to match the axial position of the holding part 220 in the insertion device 210 with the axial position of the insertion part provided in the cylinder head when it is installed in a predetermined position. The position detection device 200 is used in the centering operation to adjust the positional relationship between the holding portion 220 of the insertion device 210 and the portion of the cylinder head to be inserted.

[0027] As shown in Figure 1, the position detection device 10 has an indicator section 20 and a mounting section 30. The indicator section 20 is a component installed on the base 300 side for setting the workpiece. The mounting section 30 is a component installed on the insertion device 210 side. The indicator section 20 and the mounting section 30 will be described in more detail below.

[0028] As shown in Figure 1, the indicator part 20 is installed as an indicator of the insertion position where the part to be inserted in the workpiece is expected to arrive, when the workpiece (a cylinder head in this embodiment) is installed at a predetermined installation position on the base 300. The indicator part 20 is installed on the base 300 on which the workpiece is installed. The indicator part 20 has a fixing part 22 and a shaft part 24. The fixing part 22 is the part that is fixed to the base 300. The shaft part 24 is an axial part provided in relation to the fixing part 22. When the fixing part 22 is attached to the base 300, the shaft part 24 is positioned so that its axial position matches the position where the valve guide insertion hole (part to be inserted) is expected to arrive when the workpiece is installed on the base 300.

[0029] As shown in Figures 1 and 2, the mounting portion 30 is attached to the holding portion 220 of the insertion device 210. The mounting portion 30 has a first assembly portion 40, a second assembly portion 50, a support shaft portion 60, an intermediate portion 70, a holder portion 90, and a tester portion 100.

[0030] As shown in Figures 2 and 3, the first assembly part 40 is a component (expansion block) that is assembled along the inner circumferential surface of the holding part 220 provided on the insertion device 210. The first assembly part 40 is a component that, when combined with the first block 42, the second block 44, and the ring member 46 (not shown in Figure 3), forms a substantially cylindrical external shape as a whole. Furthermore, the axial length of the first assembly part 40 is smaller than the depth (axial length) of the recess that forms the holding part 220. Specifically, the axial length of the first assembly part 40 is set to be long enough to form a space within the recess that forms the holding part 220 that can accommodate the pressing part 84 and contact part 86 that constitute the pressing force mechanism 80, which will be described in detail later.

[0031] The first block 42 is a semi-cylindrical member that forms one radial side of the first assembly portion 40, with the axial center as the boundary. The second block 44 is a member that is paired with the first block 42. The second block 44 is a semi-cylindrical member that forms the other radial side of the first assembly portion 40, with the axial center as the boundary. By combining the first block 42 and the second block 44, a first inner circumferential surface 40a that forms the inner circumference of the first assembly portion 40 and an inner space 40b surrounded by the first inner circumferential surface 40a are formed. The first inner circumferential surface 40a has a tapered shape that widens from one side to the other in the axial direction of the first assembly portion 40. In addition, the outer circumferential surfaces of the first block 42 and the second block 44 are provided with recesses 40c that are recessed toward the radially inward side of the first assembly portion 40.

[0032] The ring member 46 is an elastic annular member formed from a material such as rubber or silicone. The first assembly part 40 is assembled by combining the first block 42 and the second block 44 so that a first inner circumferential surface 40a and an inner space 40b are formed, and the ring member 46 is fitted into the recess 40c provided on the outer circumference of the first block 42 and the second block 44, and then fitted into the holding part 220 of the insertion device 210. When the first assembly part 40 is fitted into the holding part 220 in this state, the ring member 46 comes into contact with the inner circumferential surface of the holding part 220 and is positioned accordingly. The first assembly part 40 is also positioned such that the first inner circumferential surface 40a (the opening cross-section of the inner space 40b) expands from the back side to the front side (the opening side of the holding part 220), and is fitted into the holding part 220. As a result, the first inner circumferential surface 40a is formed to widen on the inside of the holding portion 220, from the back side to the front side in the insertion direction of the second assembly portion 50, which will be described in detail later.

[0033] As shown in Figures 2 and 4, the second assembly portion 50 is the portion inserted into the inner space 40b of the first assembly portion 40 in the first direction (up and down in this embodiment). The second assembly portion 50 has an axial shape, and its outer circumferential surface is tapered. The second assembly portion 50 is formed so that its cross-sectional area expands from one end (the leading end in the insertion direction into the first assembly portion 40) to the other end in the axial direction (the front end in the insertion direction into the first assembly portion 40). The tapered shape of the second assembly portion 50 corresponds to the tapered shape of the first inner circumferential surface 40a of the first assembly portion 40 described above.

[0034] As shown in Figures 2 and 4, the support shaft portion 60 is an axial portion formed so that its axial center position and axial direction coincide with the second assembly portion 50 described above. The support shaft portion 60 becomes the pivot shaft of the holder portion 90, which will be described in detail later.

[0035] As shown in Figures 2 and 4, the intermediate portion 70 is located between the second assembly portion 50 and the support shaft portion 60. The intermediate portion 70 is larger than the opening area of ​​the holding portion 220. Also, as described above, the axial length of the first assembly portion 40 is smaller than the depth (axial length) of the recess that forms the holding portion 220. Therefore, by inserting the second assembly portion 50 into the inner space 40b of the first assembly portion 40 which is set inside the holding portion 220, and fixing the intermediate portion 70 to the holding portion 220 with the intermediate portion 70 abutting against the end face on the opening side of the holding portion 220, the second assembly portion 50 can be positioned at a predetermined position in the axial direction (first direction).

[0036] The pressing force mechanism 80 is a mechanism for applying a pressing force to the first assembly part 40 in a direction from the back to the front in the insertion direction of the second assembly part 50 (in the illustrated example, from top to bottom) when the second assembly part 50 is inserted into the first assembly part 40. As shown in Figure 2, the pressing force mechanism 80 includes a through hole 82, a pressing part 84, a contact part 86, and an operating shaft 88.

[0037] The through-hole 82 is a through-hole in the mounting portion 30 that extends through the second assembly portion 50 in the axial direction (first direction). The through-hole 82 is formed to reach the support shaft portion 60 from the second assembly portion 50 through the intermediate portion 70 and penetrate in the axial direction. Part or all of the through-hole 82 is a screw hole with an internal thread on its inner circumferential surface. In this embodiment, the portion from the second assembly portion 50 to the intermediate portion 70 is a screw hole with an internal thread on its inner circumferential surface.

[0038] The pressing portion 84 is the part that contacts the first assembly portion 40 on the inner side in the insertion direction of the second assembly portion 50 when the second assembly portion 50 is inserted into the first assembly portion 40. The pressing portion 84 is collar-shaped and has a through hole 84a at its axial position.

[0039] The contact portion 86 is connected to one end of the operating shaft 88, which will be described later, and has a shape that extends in a direction intersecting the axial direction of the operating shaft 88. The contact portion 86 is positioned so as to be able to contact the pressing portion 84 from the back side in the insertion direction of the second assembly portion.

[0040] The operating shaft 88 is a shaft body with one end connected to the center of the contact portion 86 described above and the other end being a free end. The operating shaft 88 is positioned to extend from the back to the front in the insertion direction of the second assembly portion 50 relative to the first assembly portion 40. Specifically, the operating shaft 88 is inserted through a through hole 84a provided in the center of the pressing portion 84 and is also inserted into the through hole 82 from the second assembly portion 50. The operating shaft 88 is shorter than the length of the through hole 82 (the length from the second assembly portion 50 through the intermediate portion 70 to the support shaft portion 60 in the mounting portion 30). Therefore, the end of the operating shaft 88 is located inside the through hole 82. In this embodiment, the operating shaft 88 is inserted so as to reach from the second assembly portion 50 to the intermediate portion 70.

[0041] The operating shaft 88 is composed of a screw shaft with male threads formed on its outer circumference, either partially or entirely. In this embodiment, substantially the entire operating shaft 88 is composed of a screw shaft. The operating shaft 88 is screwed into a female thread provided on the inner circumferential surface of the through hole 82. The operating shaft 88 also has an engaging portion 88a at its free end (lower end in the illustrated state) that can engage with an operating member such as a tool inserted through the through hole 82. The engaging portion 88a is composed of a hexagonal hole. Therefore, by inserting a hexagonal wrench through the opening of the through hole 82, which is open at the end of the support shaft portion 60 (lower end in the illustrated state), and engaging it with the engaging portion 88a, which is the hexagonal hole of the operating shaft 88, the operating shaft 88 can be rotated.

[0042] The contact portion 86 and the operating shaft 88 described above can be prepared as separate components and then integrated together. For example, the head of the stopper bolt can be used as the contact portion 86, and the shaft portion can be used as the operating shaft 88.

[0043] The pressing force mechanism 80 can be operated by manipulating the operating shaft 88 from the front side in the insertion direction of the second assembly part 50 relative to the first assembly part 40. This moves the contact portion 86 in the axial direction of the operating shaft 88, allowing the pressing portion 84 to apply a pressing force to the first assembly part 40 in the direction from the back to the front in the insertion direction of the second assembly part 50. In this embodiment, the screw shaft constituting the operating shaft 88 is screwed into a female thread provided on the inner circumferential surface of the through hole 82. Therefore, by rotating the operating shaft 88 around its axis, such as by engaging a hexagonal wrench into the hexagonal hole of the operating shaft 88, the contact portion 86 can be moved in the direction from the back to the front in the insertion direction of the second assembly part 50, allowing the pressing portion 84 to apply a pressing force to the first assembly part 40. This allows the first assembly portion 40 to enter evenly around the periphery of the second assembly portion 50 between the second assembly portion 50 and the inner circumferential surface of the holding portion 220, thereby aligning the axial position of the second assembly portion 50 with the axial position of the holding portion 220.

[0044] The holder portion 90 holds the tester portion 100, which will be described later, so that it can rotate around the axis of the support shaft portion 60. As shown in Figures 2 and 5, the holder portion 90 has a rotating portion 92 and a holding portion 94.

[0045] The rotating portion 92 is a part that is rotatably supported relative to the support shaft portion 60. The rotating portion 92 has a through portion 92a that penetrates in the first direction (vertical direction), and a bearing 96 is provided on its inner circumference. The rotating portion 92 is made rotatable about the axial center of the support shaft portion 60 by inserting the support shaft portion 60 through the bearing 96. The bearing 96 is fixed in the thrust direction by a bearing nut 96a attached to the lower end of the rotating portion 92. As a result, the bearing 96 is mounted so as not to fall downward in the first direction relative to the rotating portion 92.

[0046] The holding portion 94 is an arm-shaped part that protrudes radially outward from the rotating portion 92. The holding portion 94 is designed to hold the tester portion 100 by inserting the end of the tester portion 100 into it.

[0047] The tester unit 100 is a device capable of measuring the axial position of the shaft portion 24 by rotating a measuring probe 102, provided at its tip, while it is in contact with the outer circumferential surface of the shaft portion 24 of the indicator unit 20. The tester unit 100 may be configured as, for example, a pick tester. The tester unit 100 is held by the holding portion 94 of the holder unit 90 on the opposite side from the measuring probe 102 (the upper end side in the illustrated example).

[0048] <<Regarding the effects of the position detection device 10>> The position detection device 10 described above has the following characteristic configurations (a) to (h). Therefore, the position detection device 10 can achieve unique effects that cannot be achieved with conventional technology.

[0049] (a) The position detection device 10 of this embodiment is used to insert an insert into an insertion portion formed in a workpiece such that its axis extends in a first direction, and has a holding portion 220 into which the insert can be inserted and held, and is used to adjust the positional relationship of the holding portion 220 with respect to the insertion portion, by applying a thrusting force in a direction along the first direction to the insert held in the holding portion 220, and has an indicator portion 20 which is installed as an indicator of the insertion position where the insertion portion of the workpiece is expected to arrive when installed in a predetermined installation position, and a mounting portion 30 which is attached to the holding portion 220 of the insertion device 210, wherein the indicator portion 20 has a shaft portion 24 which is provided such that its axis position coincides with the insertion portion that is expected to arrive at the insertion position and its axis extends in a first direction, and the mounting portion 30 has a first assembly portion 40 which is assembled along the inner circumference of the holding portion 220 of the insertion device 210 and the inner circumference of the first assembly portion 40 The device comprises a second assembly portion 50 inserted in a first direction into an inner space 40b surrounded by a first inner circumferential surface 40a, a support shaft portion 60 formed so as to coincide with the second assembly portion 50 in terms of axial position and axial direction, a holder portion 90 provided on the support shaft portion 60 so as to be rotatable about the axial position of the support shaft portion 60, and a tester portion 100 held by the holder portion 90, and in a state in which the second assembly portion 50 is inserted into the first assembly portion 40 assembled to the holding portion 220, the holder portion 90 is provided on the support shaft portion 60 The device is characterized in that the positional relationship between the part to be inserted on the workpiece and the holding part 220 on the insertion device 210 can be adjusted by rotating the da part 90 and moving the tester part 100 around the shaft part 24, the first inner circumferential surface 40a is tapered so as to widen from the back side to the front side in the insertion direction of the second assembly part 50, and the outer circumferential surface of the second assembly part 50 is tapered so as to widen from the front side to the front side in the insertion direction of the first assembly part 40.

[0050] The position detection device 10 is capable of attaching the mounting portion 30 to the holding portion 220 by inserting the second mounting portion 50 into the inner space 40b formed inside the first mounting portion 40, which is assembled along the inner circumferential surface of the holding portion 220 provided on the insertion device 210. Furthermore, the first inner circumferential surface 40a, which forms the inner circumference of the first mounting portion 40, is tapered so as to widen from the back to the front in the insertion direction when the second mounting portion 50 is inserted into the inner space 40b. Also, the outer circumferential surface of the second mounting portion 50 is tapered so as to widen from the front to the front in the insertion direction into the first mounting portion 40.Therefore, by assembling the second mounting portion 50 to the first mounting portion 40, the position detection device 10 can attach the mounting portion 30 to the holding portion 220 while suppressing the occurrence of gaps that would cause looseness between the mounting portion 30 and the holding portion 220. Therefore, the position detection device 10 suppresses the occurrence of looseness caused by the gap formed between the first assembly part 40 and the second assembly part 50, and can accurately adjust the positional relationship between the part to be inserted on the workpiece and the holding part 220 of the insertion device 210.

[0051] (b) The position detection device 10 described above has a pressing force acting mechanism 80 that applies a pressing force to the first assembly part 40 in the direction from the back to the front in the insertion direction of the second assembly part 50 when the mounting part 30 is inserted into the first assembly part 40.

[0052] Since the position detection device 10 has the configuration described in (b) above, when the second assembly part 50 is inserted into the first assembly part 40, the pressing force mechanism 80 can press the first assembly part 40 against the second assembly part 50. As a result, the position detection device 10 can attach the mounting part 30 to the holding part 220 while minimizing the gap formed between the first assembly part 40 and the second assembly part 50. Therefore, the position detection device 10 can suppress the occurrence of looseness caused by the gap formed between the first assembly part 40 and the second assembly part 50, and can adjust the positional relationship between the part to be inserted and the holding part 220 with high precision.

[0053] (c) The position detection device 10 described above has a mounting portion 30 that has a through hole 82 that extends through the second assembly portion 50 in the axial direction, and a pressing force acting mechanism 80 has a pressing portion 84 that abuts against the first assembly portion 40 on the back side of the second assembly portion 50 in the insertion direction when the second assembly portion 50 is inserted into the first assembly portion 40, an operating shaft 88 that extends from the back side to the front side in the insertion direction of the second assembly portion 50, and is connected to the operating shaft 88. The device has a contact portion 86 that contacts the pressing portion 84 from the rear side in the insertion direction of the second assembly portion 50, and an operating shaft 88 is inserted into the through hole 82, and by operating the operating shaft 88 from the front side in the insertion direction of the second assembly portion 50, the contact portion 86 is moved in the axial direction of the operating shaft 88, and a pressing force is applied from the pressing portion 84 to the first assembly portion 40 in the direction from the rear side in the insertion direction of the second assembly portion 50 toward the front side.

[0054] As described above, the position detection device 10 has the configuration shown in (c). By operating the operating shaft 88, which is inserted through the through hole 82, from the front side in the insertion direction of the second assembly part 50, and moving the pressing part 84 from the back side to the front side in the insertion direction of the second assembly part 50, a pressing force is applied to the first assembly part 40, and the first assembly part 40 is pressed against the second assembly part 50. As a result, the position detection device 10 can attach the mounting part 30 to the holding part 220 while minimizing the gap formed between the first assembly part 40 and the second assembly part 50. Therefore, the position detection device 10 can suppress the occurrence of looseness caused by the gap formed between the first assembly part 40 and the second assembly part 50, and can accurately adjust the positional relationship between the part to be inserted and the holding part 220.

[0055] (d) The position detection device 10 described above has a screw shaft as part or all of the operating shaft 88, and a screw hole as part or all of the through hole 82, and the screw shaft that makes up the operating shaft 88 and the screw hole that makes up the through hole 82 are screwed together, and by rotating the operating shaft 88 the contact portion 86 can be moved in the direction from the back side to the front side in the insertion direction of the second assembly portion 50.

[0056] Since the position detection device 10 has the configuration described in (d) above, by rotating the operating shaft 88 inserted through the through hole 82 from the front side in the insertion direction of the second assembly part 50, the pressing part 84 can be moved from the back side in the insertion direction of the second assembly part 50 to the front side, thereby applying a pressing force to the first assembly part 40.

[0057] (e) The position detection device 10 described above is designed so that the first assembly part 40 can be expanded in a second direction (radial direction) intersecting the first direction (axial direction) by applying a pressing force in the first direction.

[0058] Since the position detection device 10 has the configuration described in (e) above, by applying a pressing force to the first assembly part 40 and moving the second assembly part 50 from the back to the front in the insertion direction, the first assembly part 40 can be made to expand in the second direction along the outer circumferential surface of the second assembly part 50 and come into close contact with it. As a result, the position detection device 10 can attach the mounting part 30 to the holding part 220 with almost no gap formed between the first assembly part 40 and the second assembly part 50. Therefore, the position detection device 10 can suppress the occurrence of looseness caused by the gap formed between the first assembly part 40 and the second assembly part 50 and can adjust the positional relationship between the part to be inserted and the holding part 220 with high precision.

[0059] (f) The position detection device 10 described above has a holder portion 90 that is rotatably supported with respect to the support shaft portion 60 via a bearing 96.

[0060] By configuring the position detection device 10 as described in (f) above, the holder portion 90 can rotate smoothly with respect to the support shaft portion 60 without rattling. As a result, the position detection device 10 can suppress a decrease in positional accuracy due to the formation of a gap between the holder portion 90 and the support shaft portion 60. This allows the position detection device 10 to accurately adjust the positional relationship between the inserted portion and the holding portion 220.

[0061] (g) The position detection device 10 described above has a tester unit 100 which is made up of a pick tester, and is capable of adjusting the axial position of the shaft unit 24 by rotating while contacting the outer circumferential surface of the shaft unit 24.

[0062] Since the position detection device 10 has the configuration described in (g) above, the positional relationship between the shaft portion 24, which is provided as the part to be inserted, and the holding portion 220 can be adjusted with high precision. As a result, the positional relationship between the part to be inserted and the holding portion 220 when the workpiece is placed in a predetermined position can be adjusted with high precision.

[0063] (h) The position detection device 10 described above is preferably used when the workpiece is the cylinder head of an engine, the insert is a valve guide, and the part to be inserted is an insertion hole into which the valve guide is inserted.

[0064] By configuring the position detection device 10 as described in (h) above, the insertion device 210 can be smoothly and accurately adjusted in preparation for assembling the valve guides to the cylinder head of the engine. As a result, the position detection device 10 can achieve effects such as improved reliability of the insertion device 210, improved product quality of engines assembled using the insertion device 210, and a significant reduction in the time required for centering the insertion device 210.

[0065] It should be noted that the position detection device 10 described above is merely one embodiment of the present invention, and its configuration can be modified as appropriate without departing from the spirit of the present invention. For example, the position detection device 10 is not limited to having all of the configurations described in (a) to (h) above, and it is possible to omit any of these configurations or replace them with other configurations.

[0066] Specifically, instead of attaching the mounting portion 30 to the holding portion 220 of the insertion device 210 and attaching the indicator portion 20 to the part of the workpiece to be inserted, as described in (a) above, the position detection device 10 may be configured such that the mounting portion 30 is attached to the part of the workpiece to be inserted and the indicator portion 20 is attached to the holding portion 220 of the insertion device 210. In this way, the same effects and advantages can be obtained by swapping the mounting targets of the indicator portion 20 and the mounting portion 30 compared to the example illustrated in the above embodiment.

[0067] The position detection device 10 of this embodiment is equipped with a pressing force mechanism 80 as described in (b) above, which allows a pressing force to be applied to the first assembly part 40 in the direction from the back to the front in the insertion direction of the second assembly part 50. However, the present invention is not limited thereto. For example, the position detection device 10 may be provided without a pressing force mechanism 80.

[0068] In this embodiment, as shown in (c) above, by operating the operating shaft 88 from the front side of the second assembly part 50 in the insertion direction, the contact part 86 is moved in the axial direction of the operating shaft 88, and a pressing force is applied from the pressing part 84 to the first assembly part 40 in the direction from the back side to the front side in the insertion direction of the second assembly part 50. However, the present invention is not limited thereto. For example, if the insertion device 210 is configured such that the pressing part 84 can be operated from the back side of the second assembly part 50 in the insertion direction in the holding part 220, the configuration as shown in (c) above is not required.

[0069] In this embodiment, the configuration described in (d) above illustrates a configuration in which the contact portion 86 can be moved in the axial direction of the operating shaft 88 by rotating the operating shaft 88, but the present invention is not limited thereto. For example, it is also possible to not provide screws in the operating shaft 88 and the through hole 82, and to move the contact portion 86 in the axial direction of the operating shaft 88 by pulling the operating shaft 88 inserted through the through hole 82 in the axial direction.

[0070] In this embodiment, as shown in (e) above, an example was shown in which the first assembly portion 40 is expandable in a second direction (radial direction) intersecting the first direction (axial direction) by applying a pressing force in the first direction. However, the present invention is not limited to this. For example, the first assembly portion 40 may be one that does not expand in the second direction (radial direction).

[0071] In this embodiment, as shown in (f) above, a configuration in which a bearing 96 is provided between the holder portion 90 and the support shaft portion 60 is illustrated, but the present invention is not limited thereto. Specifically, the position detection device 10 can be configured without the bearing 96 when the presence of play between the holder portion 90 and the support shaft portion 60 is not a problem, or when the presence of such play is acceptable. Furthermore, if the play between the holder portion 90 and the support shaft portion 60 can be eliminated by a configuration other than the one that provides the bearing 96, such a configuration may be used instead.

[0072] In this embodiment, an example is shown in which the tester unit 100 is configured with a pick tester, as described in (g) above, but the present invention is not limited thereto. For example, it is possible to use a dial gauge or sensors of a different configuration instead of a pick tester.

[0073] In this embodiment, the position detection device 10 is exemplified as being used when inserting a valve guide into an insertion hole provided in the cylinder head of an engine, as described in (h) above, but the present invention is not limited thereto. The position detection device 10 can also be used to adjust the position of an insertion device for inserting an axial or cylindrical insert into an insertion hole provided in an object other than the cylinder head of an engine.

[0074] In the above embodiment, a valve guide is used as the insert, the cylinder head of an engine is used as the workpiece, and the position detection device 10 is used to center the insertion device 210 for inserting the valve guide into the valve guide hole provided therein. However, the present invention is not limited to this. For example, a valve seat may be used as the insert, the cylinder head of an engine may be used as the workpiece, and a device for inserting the valve seat into a valve seat insertion hole provided therein may be used instead of the insertion device 210, with the position detection device 10 being used to center this device.

[0075] The present invention is not limited to the embodiments and modifications described above, and other embodiments may be possible in the spirit and teachings thereof, without departing from the scope of the claims. The components of the embodiments described above may be arbitrarily selected and combined. Furthermore, any component of the embodiments may be arbitrarily combined with any component described in the means for solving the problem, or any component that embodies any component described in the means for solving the problem. We intend to obtain rights for these as well in amendments or divisional applications of this application. [Industrial applicability]

[0076] The present invention is suitably applicable to the overall positioning of an insertion device for inserting an axial or cylindrical insert into an insertion hole provided in a workpiece. [Explanation of symbols]

[0077] 10: Position detection device 20:Indicator part 24: Shaft 30: Mounting part 40:First assembly section 40a: First inner peripheral surface 40b:Inner space 50:Second assembly section 60: Support shaft 80: Pressure force action mechanism 82: Through hole 84: Pressing part 86: Contact part 88: Operation axis 90: Holder part 96: Bearings 100: Tester section 210: Insertion device 220: Holding part

Claims

1. An insertion device capable of inserting an insert into an insertion portion formed in a workpiece so as to extend in a first direction, and a position detection device used to adjust the positional relationship between the insertion portion and the insertion portion, An indicator portion is provided in the insertion device to serve as an indicator of the insertion position in which the insert is inserted into the insertion portion, or the position of a holding portion that can hold the insert in the insertion portion. The insertion device, or the attachment part attached to the part to be inserted, It has, The indicator portion has a shaft portion that is provided so as to extend in the first direction and whose axial position coincides with the holding portion that is provided in the insertion device and capable of holding the insert that is inserted into the insertion portion, the insert portion that is installed at the insertion position, The aforementioned mounting portion is A first assembly portion is assembled along the inner circumferential surface of the holding portion or the inner circumferential surface of the portion to be inserted, A second assembly portion is inserted into the inner space surrounded by the first inner surface forming the inner circumference of the first assembly portion, in the direction of the first direction. A support shaft portion is formed such that its axial position and first direction coincide with the second assembly portion, A holder portion is provided with respect to the aforementioned support shaft portion so as to be rotatable about the axial position of the support shaft portion, The tester unit held in the holder portion, It has the following characteristics: With the first assembly part and the second assembly part assembled to the holding part or the part to be inserted, the holder part can be rotated relative to the support shaft part, and the tester part can be moved around the shaft part, thereby enabling the detection of the positional relationship between the insert formed in the workpiece and the insertion device. A position detection device characterized in that the first inner surface of the first assembly part and the outer surface of the second assembly part are tapered so as to widen from the back to the front in the insertion direction, so as to meet.

2. The aforementioned mounting portion With the second assembly part inserted into the first assembly part, a pressing force mechanism presses at least one of the first assembly part and the second assembly part from the back side to the front side in the insertion direction, The second assembly portion has a through hole that extends in the first direction, It has, The aforementioned pressing force mechanism A first pressing portion that contacts the first assembly portion on the inner side in the insertion direction, An operating shaft extending from the back side to the front side in the insertion direction through the through hole, A second pressing portion is connected to the aforementioned operating shaft and contacts the first pressing portion from the inner side in the insertion direction, It has, The position detection device according to claim 1, characterized in that by operating the operating shaft from the front side in the insertion direction of the second assembly portion, the second pressing portion is moved in the axial direction of the operating shaft, thereby applying a pressing force from the second pressing portion to the first pressing portion, and also applying a pressing force from the first pressing portion to the first assembly portion in the direction from the back side in the insertion direction of the second assembly portion toward the front side.

3. The position detection device according to claim 1 or 2, characterized in that the first assembly portion can be expanded in a second direction intersecting the first direction by applying a pressing force in the first direction.

4. The aforementioned workpiece is the cylinder head of an engine, The aforementioned insert is a valve guide, The part to be inserted is an insertion hole into which the valve guide is inserted. A position detection device according to claim 1 or 2, characterized by the following:

Images