Cylindrical gear tooth profile precision detection tool

Abstract

A cylindrical gear tooth profile precision detection tool, including a bevel gear provided with a center hole, a bushing shaft shoulder hole at one end of the center hole, and a bushing step blocking hole at the other end of the center hole, and a bushing with a shaft shoulder and installed in the center hole of the bevel gear through interference fit; the bushing and the bevel gear, the bushing is installed in the center hole of the bevel gear, the bushing shaft shoulder is matched with the bushing shaft shoulder hole of the bevel gear and closely adheres, the end of the bushing is pressed into the end face of the bushing step blocking hole of the bevel gear, and the positioning of the bushing in the center hole of the bevel gear is ensured. The cylindrical gear tooth profile precision detection tool of the application realizes reliable positioning of the bushing, firm fixation, reliable transmission, long service life of the bevel gear and the matched gear shaft, low maintenance cost, convenient maintenance, wear protection and buffering effect. It can be widely applied in the differential transmission system.

Description

Technical Field

[0001] This invention relates to a tooling for detecting the tooth profile accuracy of cylindrical gears, which can be widely used in the process of detecting the tooth profile accuracy of cylindrical gears. Background Technology

[0002] In a gear transmission system, the inner bore of a cylindrical gear mates with the gear shaft. Therefore, the inner bore of the cylindrical gear is used as a positioning reference to check the accuracy of the cylindrical gear tooth profile. The end face of the cylindrical gear contacts the shoulder end face of the gear shaft. Therefore, it is also necessary to ensure that the cylindrical gear tooth profile and the end face have a certain perpendicularity requirement.

[0003] Existing methods for detecting the tooth profile accuracy of cylindrical gears rely solely on manual measurement without a reliable positioning method. This results in poor accuracy in detecting the tooth profile accuracy of cylindrical gears, making it difficult to guarantee the quality of cylindrical gear workpieces and directly affecting the transmission capability of the cylindrical gear's inner hole mating with the gear shaft. Summary of the Invention

[0004] The purpose of this invention is to provide a cylindrical gear tooth profile accuracy detection fixture that ensures accurate detection of coaxiality and perpendicularity, reliable workpiece clamping and positioning, high assembly accuracy, high assembly efficiency, vibration resistance, and noise reduction.

[0005] To achieve the above objectives, the present invention provides a cylindrical gear tooth profile accuracy testing fixture, comprising a frame, an upper center and a lower center located on the same axis and vertically mounted on the frame, a tapered mandrel with a support platform and a central hole at both ends, the upper and lower centers pressing against the central hole, a cylindrical gear workpiece mounted on the support platform of the tapered mandrel, an expansion sleeve installed between the tapered mandrel and the inner hole of the cylindrical gear, a convex inner nut threaded to the tapered mandrel and used to fasten the expansion sleeve, an inner pressure cover that convexly and concavely engages with the convex inner nut and is mounted on the end face of the expansion sleeve by several fastening screws, an outer pressure cover located outside the inner pressure cover and mounted on the end face of the cylindrical gear workpiece, having a tapered hole at the top and a convex spherical nut at the bottom that engages with the tapered hole of the outer pressure cover, is threaded to the tapered mandrel, and fastens the outer pressure cover to the end face of the cylindrical gear workpiece, and a probe horizontally mounted on the frame for cylindrical gear tooth profile accuracy testing.

[0006] The present invention relates to a cylindrical gear tooth profile accuracy testing fixture, wherein the expansion sleeve is provided with a plurality of evenly distributed opening slots.

[0007] The present invention relates to a cylindrical gear tooth profile accuracy testing fixture, wherein the expansion sleeve has the same taper of its inner taper hole as the outer taper of its outer taper surface, and the contact area between the taper surface of the expansion sleeve and the taper surface of the outer taper surface is greater than or equal to 75%.

[0008] The working principle of the cylindrical gear tooth profile accuracy detection fixture of the present invention is as follows: (1) The tapered mandrel described in this invention has center holes at both ends. The tapered surface of the tapered mandrel and the center hole are guaranteed to have a certain coaxiality requirement. The end face of the tapered mandrel and the center hole are required to be perpendicular. The inner tapered surface of the expansion sleeve and the outer tapered surface of the tapered mandrel have the same taper. The outer circular surface of the expansion sleeve and the inner tapered surface are required to be coaxial. The expansion sleeve and the tapered surface of the tapered mandrel are fitted together. When an external force is used to expand the expansion sleeve along the tapered surface of the tapered mandrel for positioning, the cylindrical gear workpiece is clamped, ensuring the coaxiality requirement between the inner hole of the cylindrical gear workpiece and the tapered mandrel, thereby realizing the detection of the cylindrical gear tooth profile accuracy based on the inner hole and the end face.

[0009] (2) Ensure radial positioning for accurate detection In this invention, the convex inner nut and the expansion sleeve are connected as one unit by fastening screws. After being connected as one unit, the inner tapered surface of the expansion sleeve mates with the outer tapered surface of the tapered mandrel. Then, the cylindrical gear workpiece is placed into the expansion sleeve, and the lower end face of the cylindrical gear workpiece contacts and is positioned with the support platform surface of the tapered mandrel. The convex inner nut is tightened downward and moved, and the lower end face of the convex inner nut contacts the upper end face of the expansion sleeve, causing the expansion sleeve to move downward along the tapered surface of the tapered mandrel. The expansion sleeve opens, thereby tightening the inner hole of the cylindrical gear workpiece and completing the radial positioning of the cylindrical gear workpiece.

[0010] (3) Clamp the workpiece for precision inspection. After the cylindrical gear workpiece is radially tensioned and positioned, the outer pressure cover is placed on the upper end face of the cylindrical gear workpiece along the tapered mandrel. The outer pressure cover is then pressed with an outer nut, thereby pressing the cylindrical gear workpiece. The internal thread of the outer nut engages with the external thread on the tapered mandrel. The engagement between the outer nut and the end face of the outer pressure cover is a floating contact to prevent the cylindrical gear workpiece from being pressed off-center when the engagement part is pressing it. After the cylindrical gear workpiece is pressed, the fixture is placed on the upper and lower centers. The two centers press against the two center holes on the tapered mandrel. The tooth profile accuracy of the cylindrical gear can be detected using a probe.

[0011] (4) Loosen and remove the cylindrical gear workpiece After the cylindrical gear workpiece is inspected, the outer nut and outer pressure cover are removed. The convex inner nut rotates upward and moves upward. The upper end face of the convex inner nut makes contact with the inner pressure cover through a convex-concave fit. As the convex inner nut rotates upward, it drives the inner pressure cover to move upward. Since the inner pressure cover and the expansion sleeve are connected as one unit by fastening screws, the expansion sleeve also moves upward along the tapered mandrel with the convex inner nut. The expansion sleeve is loosened, thereby loosening and removing the cylindrical gear workpiece.

[0012] This invention provides a fixture for inspecting the tooth profile accuracy of cylindrical gears. On one hand, the invention employs a structure where the spherical surface of the outer nut mates with the tapered hole surface of the outer pressure cap, providing a self-centering effect, high assembly accuracy, and uniform surface contact to ensure coaxiality. On the other hand, the inner tapered hole of the expansion sleeve has the same taper as the outer tapered surface of the tapered mandrel, with a contact area exceeding 75% between the tapered surface of the expansion sleeve and the tapered surface of the tapered mandrel. This large contact area ensures that the expansion sleeve expands along the tapered mandrel, thereby guaranteeing the coaxiality requirement between the two center holes of the expansion sleeve and the tapered mandrel. This allows for the measurement of the cylindrical gear tooth profile accuracy using the inner hole of the cylindrical gear workpiece as a reference. Therefore, coaxiality is ensured during accuracy inspection.

[0013] This invention provides a fixture for inspecting the tooth profile accuracy of cylindrical gears. Center holes are provided at both ends of a tapered mandrel. Using these center holes as a reference, the coaxiality of the tapered surface and the center holes at both ends is ensured. Two centers on the measuring instrument are pressed tightly against the two center holes on the tapered mandrel, ensuring that the tooth profile accuracy inspection of the cylindrical gear workpiece uses the inner hole as the inspection reference. The end face of the cylindrical gear workpiece is brought into contact with the support platform surface, ensuring the perpendicularity of the support platform surface to the center hole, thereby ensuring the perpendicularity of the end face of the cylindrical gear workpiece to the inner hole. Therefore, the perpendicularity of the accuracy inspection is ensured.

[0014] This invention provides a fixture for measuring the precision of cylindrical gear tooth profiles. Because it features radial positioning, coaxiality, and perpendicularity structures to ensure accurate measurement, when measuring the tooth profile precision of a cylindrical gear using its inner hole and end face as references, it not only guarantees the requirement for measuring the tooth profile precision using the inner hole as a reference but also indirectly guarantees the form and position tolerance requirements of the tooth profile and end face. Therefore, this invention provides accurate precision measurement.

[0015] The present invention relates to a fixture for detecting the tooth profile accuracy of cylindrical gears. The expansion sleeve has several evenly distributed opening slots, allowing it to expand under external force, thereby clamping and positioning the inner hole of the cylindrical gear workpiece. Therefore, the workpiece clamping and positioning is reliable.

[0016] The present invention relates to a cylindrical gear tooth profile accuracy inspection fixture, which adopts a mating structure between the spherical surface of the outer nut and the conical hole surface of the outer pressure cover. On the one hand, this mating structure has uniform surface contact and a self-centering effect, ensuring coaxiality requirements. On the other hand, this spherical surface and conical hole surface mating structure with self-centering characteristics can ensure that the outer nut can automatically adjust to the correct position during assembly, reducing assembly errors. Therefore, it has high assembly accuracy and high assembly efficiency.

[0017] This invention relates to a cylindrical gear tooth profile accuracy testing fixture, which employs a mating structure between the spherical surface of the outer nut and the tapered hole surface of the outer pressure cap. This improves the tightening force and stability of the outer nut, ensuring it remains tightened under vibration and impact loads, thus preventing vibration and reducing noise. Therefore, it provides vibration protection and reduces noise.

[0018] In summary, the cylindrical gear tooth profile accuracy inspection fixture of the present invention ensures coaxiality and perpendicularity in accuracy inspection, provides accurate accuracy inspection, reliable workpiece clamping and positioning, high assembly accuracy, high assembly efficiency, vibration resistance, and noise reduction. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 A schematic diagram of the expansion and contraction structure in the middle; Detailed Implementation

[0021] exist Figure 1 , Figure 2 The present invention relates to a cylindrical gear tooth profile accuracy testing fixture, comprising a frame 1, an upper center 2 and a lower center 3 located on the same axis and vertically mounted on the frame, a tapered mandrel 4 with a central hole at both ends, which is tightened by the upper and lower centers and has a support platform, a cylindrical gear workpiece 5 mounted on the support platform of the tapered mandrel, an expansion sleeve 6 installed between the tapered mandrel and the inner hole of the cylindrical gear, a convex inner nut 7 threaded to the tapered mandrel and used to fasten the expansion sleeve, an inner pressure cover 9 that is convex and concave with the convex inner nut and mounted on the end face of the expansion sleeve by several fastening screws 8, an outer pressure cover 10 located outside the inner pressure cover and mounted on the end face of the cylindrical gear workpiece, having a tapered hole surface at the top, an outer convex spherical nut 11 with a spherical surface at the bottom that mates with the tapered hole surface of the outer pressure cover, threaded to the tapered mandrel and fastening the outer pressure cover to the end face of the cylindrical gear workpiece, and a probe 12 horizontally mounted on the frame for cylindrical gear tooth profile accuracy testing.

[0022] The present invention relates to a cylindrical gear tooth profile accuracy testing fixture, wherein the expansion sleeve 6 is provided with a plurality of evenly distributed opening slots a.

[0023] The present invention relates to a cylindrical gear tooth profile accuracy inspection fixture, wherein the expansion sleeve 6 has the same taper inner hole as the outer taper surface of the taper mandrel, and the contact area between the taper surface of the expansion sleeve and the taper surface b of the taper mandrel is greater than or equal to 75%.

[0024] The present invention relates to a cylindrical gear tooth profile accuracy inspection fixture. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention, and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A fixture for detecting the tooth profile accuracy of cylindrical gears, characterized in that, The system includes a frame, upper and lower centers mounted vertically on the frame along the same axis, a tapered mandrel with a support platform at both ends and a center hole, a cylindrical gear workpiece mounted on the support platform of the tapered mandrel, an expansion sleeve installed between the tapered mandrel and the inner hole of the cylindrical gear, a convex inner nut threaded to the tapered mandrel and used to fasten the expansion sleeve, an inner pressure cap that mates with the convex inner nut and is mounted on the end face of the expansion sleeve by several fastening screws, an outer pressure cap located outside the inner pressure cap and mounted on the end face of the cylindrical gear workpiece, a top with a tapered hole, a bottom with a spherical surface that mates with the tapered hole of the outer pressure cap, a threaded connection with the tapered mandrel and fastens the outer pressure cap to the end face of the cylindrical gear workpiece, and a probe horizontally mounted on the frame for detecting the tooth profile accuracy of the cylindrical gear.

2. The cylindrical gear tooth profile accuracy inspection fixture according to claim 1, characterized in that, The expansion sleeve is provided with several evenly distributed opening slots.

3. The cylindrical gear tooth profile accuracy inspection fixture according to claim 1, characterized in that, The expansion sleeve has the same taper in its inner hole as the outer taper of the tapered mandrel, and the contact area between the tapered surface of the expansion sleeve and the tapered surface of the tapered mandrel is greater than or equal to 75%.

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