measuring device

Abstract

A measuring device for directly measuring an angular position of a feature of a measurement object. A measuring device for measuring an angular position of a feature of a measurement object, comprising a restriction member for gripping the measurement object, an insertion object which is insertable into the feature of the measurement object, and an angle gauge, the restriction member and the insertion object being arranged to be relatively rotatable about the same axis.

Description

Technical Field

[0001] This invention relates to a measuring instrument for measuring the angular position of a feature portion of a measuring object. Background Technology

[0002] Conventionally, as a method for measuring the angular position of a feature portion of an object, an indirect measurement method using measuring devices such as vernier calipers is known. This conventional measurement method measures the straight-line distance from a reference point to the feature portion and calculates the angle value from the reference point to the feature portion based on the measured distance.

[0003] As another measurement method, a method using a measuring device like that in Reference 1 is known. The measuring device in Reference 1 is configured to measure the angular position of a hole by placing a cylindrical object to be measured on a rotating stage and inserting a guide pin into a hole in the object.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 63-281001 Summary of the Invention

[0007] In the aforementioned conventional measurement methods, the angular position of the feature cannot be directly read. Therefore, due to factors such as the tension of the object being measured and the deformation of the feature, the calculated angular position may contain errors. Furthermore, in the measuring instrument cited in Reference 1, the measurement does not take into account the actual usage state of the object being measured, and the measured angular position may also contain errors.

[0008] Therefore, the object of the present invention is to provide a measuring instrument that takes into account the actual use of the object being measured and is used to directly measure the angular position of the feature portion of the object being measured.

[0009] To address the aforementioned technical problems, this invention provides a measuring device for measuring the angular position of a feature portion of a measurement object, comprising: a limiting member for gripping the measurement object; an insertable object that can be inserted into the feature portion of the measurement object; and a protractor, wherein the limiting member and the insertable object are configured to rotate relative to each other about the same axis.

[0010] In a measuring device according to one embodiment of the present invention, the rotational position of the inserted object relative to the axis is fixed, and the limiting member is configured to rotate about the axis.

[0011] In one embodiment of the measuring device of the present invention, the angle gauge is a digital angle gauge fixed to a limiting member.

[0012] In a measuring device according to one embodiment of the present invention, the inner diameter of the limiting member is approximately equal to the inner diameter of the housing used to assemble the object to be measured, and is smaller than the outer diameter of the object to be measured before it is assembled into the housing.

[0013] In a measuring device according to one embodiment of the present invention, the limiting member has two right-angled uprights at the surface where the object to be measured is assembled, and the distance between the two right-angled uprights is smaller than the outer diameter of the object to be measured before it is assembled into the housing for assembling the object to be measured.

[0014] In one embodiment of the measuring device of the present invention, the two right-angled vertical walls are characterized by being chamfered.

[0015] In a measuring device according to one embodiment of the present invention, the limiting member includes two grooves on the inner sides of the two right-angled vertical walls that can receive the end of the object to be measured. The width of each groove is approximately the same as or greater than or equal to the thickness of the object to be measured, and the depth of each groove is approximately equal to the length of the object to be measured, which is equivalent to the cutting allowance.

[0016] In one embodiment of the measuring device of the present invention, it is characterized by further including a zero-point instrument for measuring the initial angle of the limiting member.

[0017] In a measuring device according to one embodiment of the present invention, the front end of the inserted object has a shape suitable for the feature portion of the object being measured.

[0018] In a measuring device according to one embodiment of the present invention, the front end of the inserted object is smaller than the feature portion of the object to be measured, and the portion of the inserted object other than the front end has a shape suitable for the feature portion of the object to be measured.

[0019] In a measuring device according to one embodiment of the present invention, the rotational position of the limiting member relative to the axis is fixed, and the inserted object is configured to rotate about the axis.

[0020] In one embodiment of the measuring device of the present invention, the angle gauge is an encoder mounted on the shaft.

[0021] In a measuring device according to one embodiment of the present invention, the inner diameter of the limiting member is configured to be variable.

[0022] In one embodiment of the measuring device of the present invention, the object being measured is a half-segmented metal.

[0023] In one embodiment of the measuring instrument of the present invention, the measuring object is a bushing.

[0024] In a measuring device according to one embodiment of the present invention, the limiting member is cylindrical with a segmented surface, the inner diameter of the limiting member being approximately equal to the inner diameter of the housing for assembling the bushing, and smaller than the outer diameter of the bushing before the bushing is assembled to the housing.

[0025] In a measuring device according to one embodiment of the present invention, the feature portion is an oil hole.

[0026] In a measuring device according to one embodiment of the present invention, the feature portion is a flange notch portion.

[0027] In one embodiment of the measuring device of the present invention, the inserted object is a rod-shaped rigid object.

[0028] According to the present invention, the angular position of the feature part of the object to be measured can be directly measured. Attached Figure Description

[0029] Figure 1 This is an external view of the hole angle measuring device according to the first embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional view showing a half-divided metal restraint.

[0031] Figure 3 This is a cross-sectional view showing a half-divided metal restraint.

[0032] Figure 4 This is a cross-sectional view showing a half-divided metal restraint.

[0033] Figure 5 A diagram showing the appearance of a half-segmented metal piece.

[0034] Figure 6 A diagram showing the appearance of the rod.

[0035] Figure 7 The images show the front view and side view of the hole angle measuring device according to the second embodiment of the present invention.

[0036] Figure 8 This refers to the hole angle measuring device according to the third embodiment of the present invention.

[0037] Figure 9 This refers to bushing limiters and bushings.

[0038] (Symbol Explanation)

[0039] 100-hole angle measuring instrument;

[0040] 101 Half-segment metal restraint;

[0041] 102 strokes;

[0042] 103 angle gauge;

[0043] 104 Zero Point Instrument;

[0044] 105 half-segment metal;

[0045] 201 Half-segment metal restraint;

[0046] 202 strokes;

[0047] 203 encoder;

[0048] 204 semi-segmented metal;

[0049] 300-hole angle measuring instrument;

[0050] 301 bushing limiting component;

[0051] 301a dividing surface;

[0052] 302 Three-jaw chuck;

[0053] 303 strokes;

[0054] 304 angle gauge;

[0055] 305 bushing. Detailed Implementation

[0056] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

[0057] Figure 1 This is an external view of the hole angle measuring device 100 according to the first embodiment of the present invention. Figure 1 The hole angle measuring device 100 shown in (a) includes a half-segmented metal limiter 101, a rod 102 and an angle gauge 103. Figure 1 The zero-point instrument 104 shown in (b) is an instrument for setting the initial angle of the semi-segmented metal limiter 101 relative to the rod 102. A hole with a shape matching the front end of the rod 102 is provided at the center of the zero-point instrument 104. The semi-segmented metal limiter 101 is configured to rotate together with the semi-segmented metal 105 in the assembled state. The rod 102 is a rigid, rod-shaped body with a front end shape and shaft diameter that can be inserted into an oil hole in the semi-segmented metal 105. A protractor 103 is mounted on the bottom surface of the semi-segmented metal limiter 101 and measures the rotation angle of the semi-segmented metal limiter 101.

[0058] Figure 2This is a cross-sectional view of the semi-divided metal limiting member 101 viewed from the direction of rotation axis A. The semi-divided metal limiting member 101 and the semi-divided metal 105 are configured to rotate about a rotation axis A that coincides with the central axis of the semi-divided metal limiting member 101. The rod 102 is positioned perpendicular to the rotation axis A; in this embodiment, it is positioned vertically. By moving the rod 102 vertically, it can be inserted into the oil hole of the semi-divided metal 105. The protractor 103, in this embodiment, is a digital protractor fixed to the bottom surface of the semi-divided metal limiting member 101, i.e., the surface opposite to where the semi-divided metal 105 is assembled. A locating pin is provided at the center of the semi-divided metal limiting member 101, allowing a zero-point instrument 104 to be mounted. Furthermore, in this embodiment, the rotational position of the rod 102 centered on the rotation axis A is fixed, while the semi-divided metal limiting member 101 rotates about the rotation axis A. However, this configuration is not limited to this; it is acceptable as long as the semi-divided limiting member 101 rotates relative to the rod 102. Furthermore, while the rod 102 in this embodiment is designed for ease of measurement and maintenance by using a rigid rod-shaped body, the shape and material properties of the rod 102 are not limited to this. For example, the rod 102 can be a rope-like object, or an optical means such as a laser can be used instead of the rod 102. Any means that can measure the angular position of the oil hole by inserting it into the oil hole of the semi-segmented metal 105 or by irradiating the oil hole of the semi-segmented metal 105 is acceptable.

[0059] exist Figure 3 The figure shows an axial cross-sectional view of the semi-segmented metal restraint 101 and the semi-segmented metal 105. Figure 3 (a) is a cross-sectional view of the semi-segmented metal 105 before it is assembled with the semi-segmented metal restraint 101. Figure 3 (b) is a cross-sectional view of the semi-segmented metal 105 assembled onto the semi-segmented metal restraint 101. Figure 3As shown in (b), the cross-section of the semi-divided metal limiting member 101 is approximately U-shaped, and it includes right-angled vertical walls at both ends. A C-bevel is applied to the inner side of the right-angled vertical walls to facilitate the insertion of the semi-divided metal 105. Furthermore, in this embodiment, to improve the assembly accuracy of the semi-divided metal 105 relative to the semi-divided metal limiting member 101 and to facilitate assembly, the inclination of the vertical walls provided on the semi-divided metal limiting member 101 is set to a right angle. However, the inclination of the vertical walls is not limited to this, as long as the structure allows for the assembly of the semi-divided metal 105. For example, one of the vertical walls at both ends can be set as a right-angled vertical wall, and the other as an inwardly inclined vertical wall; or both vertical walls can be inwardly inclined. Alternatively, one or both vertical walls at both ends can be inwardly inclined. Furthermore, a C-bevel is applied to the inner side of the right-angled vertical wall in this embodiment, but the processing method is not limited to this. It can also be a rounded corner or a light chamfer (line chamfer), or other processing methods, or no processing at all. If a C-bevel or rounded corner is applied, the assembly of the object-oriented limiting member becomes easier.

[0060] like Figure 3 As shown, the inner diameter d2 of the semi-segmented metal limiting member 101 is designed to be slightly smaller than the outer diameter d1 of the semi-segmented metal 105 in its free state. By applying external force to the semi-segmented metal 105 using an operator's hand or the like to press it against the semi-segmented metal limiting member 101, the semi-segmented metal 105 can be tightly fixed to the semi-segmented metal limiting member 101 in its shortened state. The inner diameter d2 of the semi-segmented metal limiting member 101 can also be set to be the same as the inner diameter of the housing when the semi-segmented metal 105 is actually installed in an engine or the like. By setting the inner diameter as described above, the position of the oil hole of the semi-segmented metal 105 can be measured with high precision under conditions close to actual use. Furthermore, the semi-segmented metal limiting member 101 of this embodiment is designed so that the size of the inner diameter d2 matches the outer diameter d1 of the semi-segmented metal 105. However, as a structure that allows the size of the inner diameter d2 to be variable, it can also be set to a structure assuming that a housing of semi-segmented metal 105 of various sizes is assembled.

[0061] Figure 4 It is an axial cross-sectional view of the state after the semi-segmented metal 105 is assembled into the semi-segmented metal restraint 101. Figure 4 The half-section metal 105 of (a) is a finished product and is not included in the parts that will be cut in subsequent processes. Figure 4 The semi-segmented metal limiting member 101 in (a) is configured to measure the position of the oil hole of the finished semi-segmented metal 105 with high precision by having an inner diameter that matches the housing when the finished semi-segmented metal 105 is actually installed into an engine, etc. On the other hand, Figure 4(b) The half-section metal 105 is an intermediate product, having a predetermined cut end in a subsequent process. Figure 4 In (b), a groove equivalent to the cutting allowance is provided in the half-segment metal limiting member 101, and the half-segment metal 105 assembled to the half-segment metal limiting member 101 is offset by an amount equivalent to the cutting allowance. Figure 4 The semi-segmented metal limiting member 101 of (b) has the structure described above, which enables high-precision measurement of the oil hole angle even when the semi-segmented metal 105 is an intermediate product, under the same conditions as the finished product.

[0062] Half-segmented metal 105 such Figure 5 The diagram shows one or more oil holes on the side. The opening shape of the oil holes can typically be... Figure 5 A circle like (a) can also be Figure 5 (b) has an elongated hole shape. Furthermore, in addition to having oil holes, the semi-segmented metal 105 may also have... Figure 5 The flange notch shown in (c) can replace the oil hole. Alternatively, although not shown, it may have a recessed portion with a locally thinned thickness. The shape of these oil holes or flange notches can be selected according to the function or purpose of the half-segment metal 105.

[0063] Figure 6 The diagram shows the external appearance of rod 102. Rod 102 is a rigid, rod-shaped body, and its front end has a shape that matches the oil hole of the semi-segmented metal 105. In this embodiment, the opening of the oil hole of the semi-segmented metal 105 is circular, and rod 102 is as follows... Figure 6 The front end shown in (a) is conical. In this embodiment, by setting the semi-segmented metal 105 and the rod 102 to the shape described above, the rod 102 can be stably inserted into the oil hole of the semi-segmented metal 105. Furthermore, the shape of the front end of the rod 102 is not limited to this; any shape that allows insertion into the oil hole and measurement of the angular position of the oil hole is acceptable. In this embodiment, the front end of the rod 102 is conical, suitable for the circular oil hole of the semi-segmented metal 105, but it is not limited to this. The front end of the rod 102 may be smaller than the oil hole of the semi-segmented metal 105, and the shaft portion of the rod 102 may be cylindrical or frustoconical, suitable for the oil hole of the semi-segmented metal 105. Furthermore, in cases where the opening of the oil hole of the semi-segmented metal 105 is an elongated hole shape or the semi-segmented metal 105 has a flange notch, by... Figure 6The front end of the rod 102 is configured as described in (b), which allows the rod 102 to be stably inserted into the oil hole or flange notch of the split metal 105. Alternatively, the front end of the rod 102 may be made smaller than the size of the oil hole or flange notch, and the shaft portion of the rod 102 may be shaped to fit the oil hole or flange notch of the split bearing 105.

[0064] The hole angle measuring device of the present invention measures the angular position of the feature portion of the object being measured by assembling the object to be measured onto a limiting member, inserting an insertable object into the feature portion of the object to be measured, rotating the object to be measured, the limiting member, and the insertable object relative to each other about an axis, and using a protractor to measure the angular position of the insertable object. Next, referring to… Figures 1 to 2 The steps for measuring the angular position of the oil hole of the semi-segmented metal 105 using the hole angle measuring device 100 of the present invention will be specifically described. First, a semi-segmented metal retainer 101, on which the semi-segmented metal 105 is assembled, is placed on the hole angle measuring device 100. Next, the semi-segmented metal retainer 101 is set in an initial position relative to the rod 102. In this embodiment, the initial position of the semi-segmented metal retainer 101 is a position where the assembly surface of the semi-segmented metal 105 is horizontal. At the aforementioned initial position, a zero-point gauge 104 is mounted on the semi-segmented metal retainer 101, and the rod 102 is inserted vertically downward into the center hole of the zero-point gauge 104 to reset the angle gauge 103 to zero. Subsequently, the rod 102 is pulled out of the center hole, and the semi-segmented metal retainer 101 is rotated to a position where the oil hole of the semi-segmented metal 105 is directly below the rod 102. In the above state, the rod 102 is inserted into the oil hole of the semi-segmented metal 105, and the angular position Y of the rod 102 is measured by the protractor 103. The angular position Y is the angular position of the oil hole of the semi-segmented metal 105. When there are multiple oil holes to be measured, the semi-segmented metal limiting member 101 can be rotated after the rod 102 is pulled out again, and the angular position of the second and subsequent oil holes can be measured by the same steps.

[0065] exist Figure 7 The measuring device of the second embodiment is shown in the figure. Figure 7 (a) is a front view of the hole angle measuring device 200 according to the second embodiment. Figure 7(b) is a side view of the hole angle measuring device 200. The hole angle measuring device 200 includes a semi-segmented metal limiter 201, a rod 202, and an encoder 203. The semi-segmented metal limiter 201 can be adjusted in size by moving a ball screw to match the outer diameter of the semi-segmented metal 204, which is assumed to be assembled with a housing. The rod 202 is configured to intersect perpendicularly with a pivot B, which is aligned with the center of the semi-segmented metal 204 assembled with the semi-segmented metal limiter 201, so that the rod 202 can rotate about the pivot B. The encoder 203 is mounted on the pivot B for measuring the rotation angle of the rod.

[0066] exist Figure 8 The image shows a hole angle measuring device 300 according to a third embodiment. This hole angle measuring device 300 includes a bushing restraint 301, three jaw chucks 302, a rod 303, and an angle gauge 304. The hole angle measuring device 300 of this embodiment is configured to measure the hole angle of the bushing by replacing the semi-segmented metal restraint 101 of the first embodiment with the bushing restraint 301 and the three jaw chucks 302. Figure 9 The third embodiment shows a bushing retainer 301 and a bushing 305. The inner diameter of the bushing retainer 301 is designed to match the outer diameter of the bushing 305, which is assumed to be assembled with a housing. The bushing retainer 301 has a dividing surface 301a, and by opening the dividing surface 301a, the inner diameter of the bushing retainer 301 is increased, thereby allowing the bushing 305 to be inserted. Then, by using a three-jaw chuck 302 to fasten the bushing retainer 301 with the bushing 305 inserted into it, the angle of the oil hole of the bushing 305 can be measured with the axial vertical cross section of the bushing 305 set to approximately a perfect circle. In addition, the bushing retainer 301 of this embodiment is provided with a dividing surface 301a, and the dividing surface 301a is opened to insert the bushing 305, but the structure of the bushing retainer 301 is not limited to this. The bushing limiter 301 can be any structure that can be embedded in the bushing 305, or it can be a bushing limiter without a dividing surface.

[0067] The above description is made with respect to specific embodiments, but the present invention is not limited thereto. Various changes and modifications can be made within the scope of the principles of the present invention and the appended claims, which will be apparent to those skilled in the art.

Claims

1. A measuring device for measuring an angular position of a feature of a measurement object, characterized in that including: a restriction member for gripping the measurement object; an insertion object which can be inserted into the feature of the measurement object; and an angle gauge, the restriction member and the insertion object are arranged to be relatively rotatable around the same axis, an inner diameter of the restriction member is substantially equal to an inner diameter of a housing for assembling the measurement object, and is smaller than an outer diameter of the measurement object before the measurement object is assembled in the housing.

2. The measurement device according to claim 1, wherein a rotational position of the insertion object with respect to the axis is fixed, the restriction member is arranged to be rotatable around the axis.

3. The measurement device according to claim 1 or 2, wherein the angle gauge is a digital angle gauge fixed to the restriction member. including:

4. A measuring device for measuring an angular position of a feature of a measurement object, characterized in that a restriction member for gripping the measurement object; an insertion object which can be inserted into the feature of the measurement object; and an angle gauge, the restriction member and the insertion object are arranged to be relatively rotatable around the same axis, the restriction member has two right-angled standing walls at a face where the measurement object is assembled, a distance between the two right-angled standing walls is smaller than an outer diameter of the measurement object before the measurement object is assembled in a housing for assembling the measurement object.

5. The measurement device according to claim 4, wherein chamfering is applied to the two right-angled standing walls.

6. The measurement device according to claim 4, wherein the restriction member includes two grooves which can receive end portions of the measurement object inside the two right-angled standing walls, a width of each of the two grooves is substantially equal to, or is greater than or equal to, a thickness of the measurement object, a depth of each of the two grooves is substantially equal to a length of an amount corresponding to a cutting allowance of the measurement object.

7. The measurement device according to claim 1 or 4, further comprising: a zero point gauge for measuring an initial angle of the restriction member.

8. The measurement device according to claim 1 or 4, wherein a front end of the insertion object has a shape which is suitable for the feature of the measurement object.

9. The measurement device according to claim 1 or 4, wherein a front end of the insertion object is smaller than the feature of the measurement object, and a portion of the insertion object other than the front end has a shape which is suitable for the feature of the measurement object.

10. The measurement device according to claim 1 or 4, wherein a rotational position of the restriction member with respect to the axis is fixed, the insertion object is arranged to be rotatable around the axis.

11. The measurement device according to claim 10, wherein the angle gauge is an encoder arranged on the axis.

12. The measurement device according to claim 1 or 4, wherein an inner diameter of the restriction member is variable.

13. The measurement device according to claim 1 or 4, wherein the measurement object is a half-split metal.

14. The measurement device according to claim 1 or 4, wherein the measurement object is a bushing. including: ​ 15. A measuring device for measuring an angular position of a feature of a measurement object, characterized in that ​ a restriction member for gripping the measurement object; an insertion object which is insertable into the feature of the measurement object; and an angle gauge, the restriction member and the insertion object are arranged to be relatively rotatable about the same axis, the measurement object is a bushing, the restriction member is cylindrical with a split surface, the inner diameter of the restriction member is substantially equal to the inner diameter of a housing for assembling the bushing, and is smaller than the outer diameter of the bushing before the bushing is assembled in the housing.

16. The gauge according to claim 1, 4 or 15, wherein the feature is an oil hole.

17. The gauge according to claim 1, 4 or 15, wherein the feature is a flange notch.

18. The gauge according to claim 1, 4 or 15, wherein the insertion object is a rod-shaped rigid object.

Images