CN214843089U - Equal common normal line gear spiral line sample plate - Google Patents
Equal common normal line gear spiral line sample plate Download PDFInfo
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- CN214843089U CN214843089U CN202121468917.6U CN202121468917U CN214843089U CN 214843089 U CN214843089 U CN 214843089U CN 202121468917 U CN202121468917 U CN 202121468917U CN 214843089 U CN214843089 U CN 214843089U
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- 238000003672 processing method Methods 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model belongs to the technical field of precision gear testing, and relates to a constant common normal line gear helix template; the spiral-line quantity value transmission reference for the gear comprises three teeth, namely straight teeth, left-handed teeth and right-handed teeth which are symmetrically arranged, each tooth comprises two different-side tooth surfaces, the two different-side tooth surfaces of the straight teeth are involute cylindrical surfaces, the two different-side tooth surfaces of the left-handed teeth and the right-handed teeth are involute spiral surfaces, and the numerical values of spiral angles of the left-handed teeth and the right-handed teeth are equal. Symmetrical axial and radial reference bases are machined on the equal common normal line gear spiral line sample plate, and meanwhile, the end face pressure angle, the base circle and the reference circle of the three teeth are identical. The utility model provides a pair of when public normal line gear helix model, its design, processing and measuring basis are unified, and structural symmetry, mass balance, both ends mountable base disc are convenient for adopt the pure roll to develop the processing method and obtain high machining precision.
Description
Technical Field
The utility model belongs to the technical field of accurate gear test, a when public normal line gear helix model board that is used for gear helix quantity value transmission benchmark is related to.
Background
The gear involute template (GBT 6467-. The involute template is mainly used for transmitting the quantity of involute of gear, and has definite limit to the length of involute and the requirement of tooth width is greater than 6 mm. The gear helix template is mainly used for magnitude transmission of gear helices and has clear requirements on tooth widths. The tooth width of the 1-level precision gear spiral line sample plate is larger than 90mm, and the involute expansion length of a 0-degree spiral angle used for determining a base circle is larger than 15 mm; the tooth width of the 2-level precision gear spiral line sample plate is larger than 60mm, and the involute line spreading length of a 0-degree spiral angle used for determining a base circle is larger than 10 mm. The gear spiral line sample plate has no requirements on the section profile and the tooth height for the left-handed and right-handed spiral surfaces with the same design angle and the helix angle of not 0 degrees. That is, the left-hand and right-hand helical surfaces of the gear helix template with helix angles other than 0 °, i.e. without section profiles, can be involute, straight or other types of curves. The newly designed gear spiral line sample plate covers all the characteristics recommended by the national standard of the gear spiral line sample plate, but the characteristics of difficulty in processing, structural rigidity, easiness in use and the like of the gear spiral line sample plate are considered.
At present, the tooth surfaces of the existing gear spiral line sample plates in the market with different spiral angles are all one, the difference generated by measuring the left and right tooth surfaces by a gear measuring instrument cannot be checked, and the tooth width length and the precision cannot meet the requirement of 1-level precision in the gear spiral line sample plate (GBT 6468 and 2010). Patent ZL 201811078252.0 discloses a reference level gear helix model, the design structure and the pattern of a reference level gear helix model have been mentioned, adopt the structural style who has straight tooth's socket, levogyration tooth's socket and dextrorotation tooth's socket of processing on a cylinder, and the barycenter of model is located the geometric center of axle section, cover the basic requirement of 1 level precision profile helix model, but the tooth's socket of indent structure adopts the pure processing of rolling exhibition method to add can only single tooth face, the normal force that the cutter applied to the model during processing can produce certain influence to pure rolling exhibition motion. The invention patent (ZL 201711393983. X) discloses a self-installation reference equal common normal line gear involute sample plate, involutes of left and right special-shaped tooth surfaces of the common normal line gear involute sample plate have the same common normal line and a uniform expansion base circle arc, and ultra-precision machining and testing of the gear involute sample plate are facilitated.
SUMMERY OF THE UTILITY MODEL
For the processing difficult problem of solving high accuracy gear helix model, the utility model provides a gear helix model of equal common normal line structure.
The specific technical scheme is as follows:
a spiral line sample plate of an equal common normal gear is of an integral symmetrical structure and comprises three teeth, namely a straight tooth, a left-handed tooth and a right-handed tooth which are symmetrically arranged, each tooth comprises two different side tooth surfaces, the two different side tooth surfaces of the straight tooth are involute cylindrical surfaces, the two different side tooth surfaces of the left-handed tooth and the right-handed tooth are involute spiral surfaces, and the numerical values of spiral angles of the left-handed tooth and the right-handed tooth are equal; the axial and radial reference benchmarks are symmetrically arranged on the equal common normal line gear spiral template.
Six tooth surfaces on the spiral template of the gear with the common normal have the same end surface pressure angle, base circle and reference circle.
Three teeth on the spiral template of the gear with the equal common normal line all adopt the structure with the equal common normal line, the common normal line lengths of the three teeth are equal, and the three teeth can be processed by using the same set of cutter based on the pure rolling generating principle.
The beneficial effects of the utility model reside in that, the utility model provides an equal common normal line gear helix model has contained three teeth of symmetrical arrangement's straight-tooth, left-handed tooth and right-handed tooth, and every tooth all contains two heteropleural flank surfaces, and wherein two heteropleural flank surfaces of straight-tooth are the face of cylinder of gradually opening, and two heteropleural flank surfaces of left-handed tooth and right-handed tooth are the helicoid of gradually opening, and the helical angle numerical value of left-handed tooth and right-handed tooth equals. Symmetrical axial and radial reference bases are machined on the equal common normal line gear spiral line sample plate, and meanwhile, the end face pressure angle, the base circle and the reference circle of the three teeth are identical. The structural characteristics of the equal common normal line enable two different side tooth surfaces of each tooth of the gear spiral line sample plate to be simultaneously machined through a pure rolling generating method, and normal forces applied to the left and right different side tooth surfaces by the cutter are mutually offset, so that high machining precision can be obtained. The utility model provides a pair of when public normal line gear helix model, its design, processing and measuring basis are unified, and structural symmetry, mass balance, both ends mountable base disc are convenient for adopt the pure roll to develop the processing method and obtain high machining precision.
Drawings
Fig. 1 shows straight teeth and right-handed teeth of a spiral template of an iso-normal gear.
The right-handed teeth and the left-handed teeth of the spiral template of the gear with the common normal line of figure 2.
The left-handed teeth and the straight teeth of the spiral template of the gear with the same common normal line of figure 3.
FIG. 4 is an iso-normal design drawing of the tooth surface of the helical template of the iso-normal gear.
In the figure: 1 equal common normal line gear spiral line sample plate; 1-1 straight teeth; 1-1-1 left tooth surface involute cylindrical surface of straight tooth; 1-1-2 right tooth surface involute cylindrical surface; 1-1-3 straight tooth arc tool withdrawal grooves; 1-2 right-handed teeth; 1-2-1 right tooth face and right hand involute helicoid; 1-2-2 of left tooth surface right-hand involute helicoid; 1-2-3 right-handed tooth arc tool withdrawal grooves; 1-3 left-handed teeth; 1-3-1 left-handed involute helicoid of right flank; 1-3-2 left tooth surface left-hand involute helicoids; 1-3-3 left-handed tooth arc tool withdrawal grooves; 1-4AA end shaft section; 1-4BB end shaft section; 1-5AA end radial reference cylindrical surface; 1-5BB end radial reference cylindrical surface; 1-6AA end axial reference ring surface; 1-6BB end axial reference ring surface; 1-7AA end fine thread; 1-7BB end fine thread; 1-8AA end center hole; 1-8BB end center hole; 2 base circle; 3 straight tooth common normal line; 4, a right-hand tooth common normal line; 5 common normal of left-handed teeth.
Detailed Description
The design concept and the structural characteristics of the gear helix template with the common normal line are described by taking the gear helix template 1 with the common normal line, the base circle diameter of which is 100mm and the tooth width of which is 100mm as an example.
The maximum excircle diameter of the gear spiral line sample plate with the common normal line is set to be 112mm, the involute cylindrical surface and the involute spiral surface start from the base cylindrical surface, and theoretically, the maximum involute length is 25.22mm, so that the requirement of the gear spiral line sample plate on the national standard level 1 precision is met. Three teeth, namely straight teeth 1-1, right-handed teeth 1-2 and left-handed teeth 1-3 are machined on the outer cylindrical surface of the spiral line sample plate of the gear with the common normal line. The straight teeth 1-1 comprise two different side involute cylindrical surfaces respectively, the left-handed teeth 1-3 comprise two different side involute spiral surfaces with a left-handed 14-degree base circle spiral angle respectively, and the right-handed teeth 1-2 comprise two different side involute spiral surfaces with a right-handed 14-degree base circle spiral angle respectively; and arc tool withdrawal grooves with the radius of 4mm are arranged on the end surface A of the outer cylindrical surface of the spiral line sample plate of the equal common normal line gear, and the transition positions of the involute cylindrical surface and the involute spiral surface on the spiral line sample plate of the equal common normal line gear and the spiral line sample plate of the equal common normal line gear are tangent to the root circle and the base circle. The arc tool withdrawal groove reduces the stress concentration of the structure, and is favorable for ensuring the processing precision of the involute cylindrical surface and the involute spiral surface. The three tooth sockets are respectively as follows in the clockwise direction when viewed from the A end: straight teeth 1-1, right-handed teeth 1-2 and left-handed teeth 1-3; the left-handed teeth 1-3 and the right-handed teeth 1-2 are symmetrically arranged relative to the straight teeth 1-1, and the included angle between the left-handed teeth 1-3 or the right-handed teeth 1-2 and the straight teeth 1-1 is 113.5 degrees, so that the center of mass point of the equal common normal line gear spiral line sample plate perpendicular to the axial direction is ensured to pass through the center of the equal common normal line gear spiral line sample plate mandrel.
Because the left-handed teeth 1-3 and the right-handed teeth 1-2 are composed of involute helicoids with the same helical angle, after the left-handed teeth 1-3 and the right-handed teeth 1-2 are adjusted to be symmetrically arranged relative to the straight teeth 1-1, and the included angle between the left-handed teeth 1-3 or the right-handed teeth 1-2 and the straight teeth 1-1 is 113.5 degrees, the geometric center of the adjusted equal-common-normal-line gear helical line sample plate mandrel is not influenced by the left-handed teeth 1-3 and the right-handed teeth 1-2. And setting the distance between the axial reference ring surface 1-6A of the end A and the axial reference ring surface 1-6B of the end B as 140mm, and the diameters of the shaft sections 1-4A of the end A and the shaft sections 1-4B of the end B as 60mm, wherein the diameters of the two shaft sections are kept consistent, so that the center of mass point of the helical sample plate of the gear with the same common normal line is positioned at the center of the helical sample plate mandrel of the gear with the same common normal line.
The involute of the involute cylindrical surface 1-1-1 of the left tooth surface of the straight tooth and the involute cylindrical surface 1-1-2 of the involute cylindrical surface of the right tooth surface of the straight tooth have the same common normal line 3 of the straight tooth and a uniform unfolding base circular arc, and the length of the common normal line is 25.22 mm; any normal tangent to the base circular arc is a common normal of the involute cylindrical surface 1-1-1 of the left tooth surface of the straight tooth and the involute cylindrical surface 1-1-2 of the right tooth surface of the straight tooth. The involute of the right-hand involute spiral surface 1-2-1 with a base circle helix angle of 14 degrees and the involute of the left-hand involute spiral surface 1-2-2 on the end surface have the same right-hand tooth common normal 4 and a uniform unfolding base circle arc FH 3; any normal tangent to the base circle arc is a common normal of the right tooth surface involute spiral surface 1-2-1 and the left tooth surface involute spiral surface 1-2-2 on the end surface. The involute of the right tooth surface left-hand involute spiral surface 1-3-1 and the left tooth surface left-hand involute spiral surface 1-3-2 on the end surface, of which the base circle helix angle is 14 degrees, have the same left-hand common normal 5 and a uniform expansion base circle arc; any normal tangent to the base circular arc is a common normal of the left-handed involute spiral surface 1-3-1 on the right tooth surface and the left-handed involute spiral surface 1-3-2 on the left tooth surface on the end surface.
The end face deflection of the two-end axial reference ring surfaces 1-6A and 1-6B relative to the two-end central holes 1-8A and 1-8B is not more than 0.2 mu m, and the parallelism deviation is not more than 0.2 mu m; the lengths of the radial reference cylindrical surfaces 1-5A and 1-5B at the two ends are equal, the diameter is 40mm, the diameter difference is not more than 1 mu m, the cylindricity error is not more than 0.5 mu m, the surface roughness is not more than Ra0.2, and the radial run-out relative to the two central holes 1-8A and 1-8B is not more than 1 mu m.
The two central holes 1-8A and 1-8B are B-shaped central holes with protective cones, the axial width of each conical surface is 2mm, the conicity of the central holes 1-8A and 1-8B is 60 degrees, the roundness error is not more than 0.4 μm, and the surface roughness is not more than Ra0.2.
The material of the gear spiral template 1 with the equal common normal line is GCr15 or a material with equivalent performance, and the surface hardness of the involute cylindrical surface and the involute spiral surface is not lower than HRC 60.
Except for a fine-machined central hole conical surface, a threaded surface, a radial reference cylindrical surface, an axial reference ring surface, an involute cylindrical surface and an involute spiral surface, other surfaces of the common normal gear spiral sample plate are subjected to rust prevention treatment.
Claims (3)
1. The spiral line sample plate for the gear with the equal common normal line is characterized by comprising three teeth, namely straight teeth (1-1), left-handed teeth (1-2) and right-handed teeth (1-3), which are symmetrically arranged, wherein each tooth comprises two different side tooth surfaces, the two different side tooth surfaces of the straight teeth are involute cylindrical surfaces, the two different side tooth surfaces of the left-handed teeth and the right-handed teeth are involute spiral surfaces, and the numerical values of spiral angles of the left-handed teeth and the right-handed teeth are equal; the axial and radial reference benchmarks are symmetrically arranged on the equal common normal line gear spiral template.
2. The iso-normal gear helix template as defined in claim 1, wherein the six different-side tooth surfaces on the iso-normal gear helix template have the same end face pressure angle, base circle and reference circle.
3. The iso-normal gear spiral template as claimed in claim 1 or 2, wherein the three teeth on the iso-normal gear spiral template are all in an iso-normal configuration, and the lengths of the common normal lines of the three teeth are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121468917.6U CN214843089U (en) | 2021-06-30 | 2021-06-30 | Equal common normal line gear spiral line sample plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121468917.6U CN214843089U (en) | 2021-06-30 | 2021-06-30 | Equal common normal line gear spiral line sample plate |
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| Publication Number | Publication Date |
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| CN214843089U true CN214843089U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121468917.6U Active CN214843089U (en) | 2021-06-30 | 2021-06-30 | Equal common normal line gear spiral line sample plate |
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| CN (1) | CN214843089U (en) |
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- 2021-06-30 CN CN202121468917.6U patent/CN214843089U/en active Active
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