This patent application claims the benefit and priority of Chinese Patent Application No. 202310633244.2, filed with the China National Intellectual Property Administration on May 31, 2023, the disclosure of which is incorporated by reference herein in its entirety as part of the present application.
The present disclosure relates to the technical field of gear transmission, in particular, to a bevel gear pair with constant meshing characteristics with a constructed tooth pair, and especially to a bevel gear pair with a constructed tooth pair that is formed by a bevel gear I with a constructed tooth pair and a bevel gear II with a constructed tooth pair as a pair, and has the same normal tooth profile, a constant curvature radius at a meshing point that tends to infinity, and a constant sliding ratio.
Bevel gears are key basic components for motion transmission and power transformation between intersecting shafts or staggered shafts, and are widely used in the fields of aerospace, vehicles and vessels, industrial automation equipment, and the like. Patents No. 103075493 A and No. 105202152 A each disclose a bevel gear pair based on conjugate curves. Each bevel gear pair constructed in the above two patents includes a convex-tooth bevel gear and a concave-tooth bevel gear, and a pair of bevel gears with concave and convex tooth profiles in the bevel gear pair needs machining by means of different cutters, which increases a manufacturing cost of the bevel gear pair. The concave and convex tooth profiles lead to a limited curvature radius at a meshing point of the gear pair, thereby limiting further improvement of the bearing capacity of the bevel gear pair. Therefore, there is an urgent need to innovate a tooth profile design based on an existing gear design theory with spatial conjugate curves, improve meshing performance of the bevel gear pair with a constructed tooth pair, and reduce a production and manufacturing cost of the bevel gear pair with a constructed tooth pair.
In view of this, the present disclosure provides a bevel gear pair with constant meshing characteristics with a constructed tooth pair. The gear pair is formed by a bevel gear I with a constructed tooth pair and a bevel gear II with a constructed tooth pair that have the same normal tooth profile, with a constant curvature radius at a meshing point that tends to infinity and a constant sliding ratio, and technically features low manufacturing cost, high bearing capacity, high transmission efficiency, and the like.
To achieve the above objective, the present disclosure provides the following solution. The present disclosure provides a bevel gear pair with constant meshing characteristics with a constructed tooth pair, including a bevel gear I with a constructed tooth pair and a bevel gear II with a constructed tooth pair as a pair based on conjugate curves, where a normal tooth profile curve Γs1 of the bevel gear I with a constructed tooth pair and a normal tooth profile curve Γs2 of the bevel gear II with a constructed tooth pair are continuous combined curves ΓL with the same curve shape, and the continuous combined curves ΓL include a combined curve ΓL1 of an odd power function curve and a tangent at an inflection point thereof, a combined curve ΓL2 of a sine function curve and a tangent at an inflection point thereof, a combined curve ΓL3 of an epicycloid function curve and a tangent at an inflection point thereof, a combined curve ΓL4 of an odd power function, a combined curve ΓL5 of a sine function, or a combined curve ΓL6 of an epicycloid function; the continuous combined curve is formed by two continuous curves, a connection point of the two continuous curves is an inflection point or a tangent point of the continuous combined curve, and the inflection point or the tangent point of the continuous combined curve is a designated point located on a meshing force action line of the bevel gear pair with a constructed tooth pair; and the normal tooth profile curve Γs1 and the normal tooth profile curve Γs2 are swept along given conjugate curves to obtain tooth surfaces of the bevel gear I with a constructed tooth pair and the bevel gear II with a constructed tooth pair.
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, when the continuous combined curve ΓL is the combined curve ΓL1 of the odd power function curve and the tangent at the inflection point thereof, the continuous combined curve ΓL is formed by an odd power function curve ΓL12 and a tangent ΓL11 at an inflection point of the odd power function curve; a rectangular coordinate system is established at the tangent point of the continuous combined curve, and an equation of the combined curve ΓL1 of the odd power function curve and the tangent at the inflection point thereof is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, when the continuous combined curve ΓL is the combined curve ΓL2 of the sine function curve and the tangent at the inflection point thereof, the continuous combined curve ΓL is formed by a sine function curve ΓL22 and a tangent ΓL21 at an inflection point of the sine function curve; a rectangular coordinate system is established at the tangent point of the continuous combined curve, and an equation of the combined curve ΓL2 of the sine function curve and the tangent at the inflection point thereof is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, when the continuous combined curve ΓL is the combined curve ΓL3 of the epicycloid function curve and the tangent at the inflection point thereof, the continuous combined curve ΓL is formed by an epicycloid function curve ΓL32 and a tangent ΓL31 at an inflection point of the epicycloid function curve; a rectangular coordinate system is established at the tangent point of the continuous combined curve, and an equation of the combined curve ΓL3 of the epicycloid function curve and the tangent at the inflection point thereof is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, when the continuous combined curve ΓL is the combined curve ΓL4 of the odd power function, the continuous combined curve ΓL is formed by a first odd power function curve ΓL41 and a second odd power function curve ΓL42; a rectangular coordinate system is established at the inflection point of the continuous combined curve, and an equation of the combined curve ΓL4 of the odd power function is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, when the continuous combined curve ΓL is the combined curve ΓL5 of the sine function, the continuous combined curve ΓL is formed by a first sine function curve ΓL51 and a second sine function curve ΓL52; a rectangular coordinate system is established at the inflection point of the continuous combined curve, and an equation of the combined curve ΓL5 of the sine function is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, when the continuous combined curve ΓL is the combined curve ΓL6 of the epicycloid function, the continuous combined curve ΓL is formed by a first epicycloid function curve ΓL61 and a second epicycloid function curve ΓL62; a rectangular coordinate system is established at the inflection point of the continuous combined curve, and an equation of the combined curve ΓL6 of the epicycloid function is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, a curve equation of the normal tooth profile curve Γs1 of the bevel gear I with a constructed tooth pair obtained by rotating the continuous combined curve ΓL around an origin of the rectangular coordinate system by an angle α1 is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, a curve equation of the normal tooth profile curve Γs2 of the bevel gear II with a constructed tooth pair obtained by rotating the normal tooth profile curve Γs1 of the bevel gear I with a constructed tooth pair around the origin of the rectangular coordinate system by an angle of 180° is as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, a tooth surface Σ1 of the bevel gear I with a constructed tooth pair is obtained by sweeping the normal tooth profile curve Γs1 of the bevel gear I with a constructed tooth pair along a given helix, with a tooth surface equation as follows:
Further, in the bevel gear pair with constant meshing characteristics with a constructed tooth pair, a tooth surface Σ2 of the bevel gear II with a constructed tooth pair is obtained by sweeping the normal tooth profile curve Γs2 of the bevel gear II with a constructed tooth pair along a given helix, with a tooth surface equation as follows:
Compared with the prior art, the present disclosure has the following beneficial technical effects:
In the present disclosure, a bevel gear I with a constructed tooth pair and a bevel gear II with a constructed tooth pair have the same normal tooth profile, and can be machined by using the same cutter, thus reducing a manufacturing cost. A curvature radius at a meshing point is constant and tends to infinity, which improves the bearing capacity of the bevel gear pair. A sliding ratio during meshing is constant and may be designed as a zero sliding ratio, which improves transmission efficiency of the bevel gear pair and reduces wear during transmission.
To describe the technical solutions in embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings required for the embodiments are briefly described below. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts.
In the figures: 1. Bevel gear I with a constructed tooth pair; 2. Bevel gear II with a constructed tooth pair; 3. Pitch cone of the bevel gear II with a constructed tooth pair; 4. Pitch cone of the bevel gear I with a constructed tooth pair; 5. Tooth profile sweeping direction; 6. Tooth surface obtained by sweeping of a normal tooth profile curve family; 7. Base cone of the bevel gear II with a constructed tooth pair; 8. Base cone of the bevel gear I with a constructed tooth pair; 9. Given helix.
The technical solutions of the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
In view of this, the present disclosure provides a bevel gear pair with constant meshing characteristics with a constructed tooth pair. The gear pair is formed by a bevel gear I with a constructed tooth pair and a bevel gear II with a constructed tooth pair that have the same normal tooth profile, with a constant curvature radius at a meshing point that tends to infinity and a constant sliding ratio, and technically features low manufacturing cost, high bearing capacity, high transmission efficiency, and the like.
In order to make the above objective, features and advantages of the present disclosure clearer and more comprehensible, the present disclosure will be further described in detail below in combination with accompanying drawings and specific implementations.
As shown in
In the embodiment of the present disclosure, basic parameters of the bevel gear pair with constant meshing characteristics with a constructed tooth pair are as follows: Large-end surface module m=8, number of teeth of the bevel gear I 1 with a constructed tooth pair: z1=8, number of teeth of the bevel gear II 2 with a constructed tooth pair: z2=24, addendum coefficient ha*=0.5, tip clearance coefficient c*=0.2, addendum ha=4 mm, dedendum hf=5.6 mm, helix angle β=35°, and tooth width w=30 mm.
With a combined curve of an odd power function curve and a tangent at an inflection point thereof as an example, the combined curve of the odd power function curve and the tangent at the inflection point thereof was drawn in a rectangular coordinate system σ1 (O−x,y), as shown in
Provided is a schematic diagram illustrating formation of a normal tooth profile of a gear pair with a constructed tooth pair having a combined curve of an odd power function curve and a tangent at an inflection point thereof as a tooth profile curve according to an embodiment of the present disclosure, with an inflection point P being a meshing point, as shown in
The combined curve ΓL1 of the odd power function curve and the tangent at the inflection point thereof rotates around the rectangular coordinate system σ1 by an angle of α1=120° to obtain the normal tooth profile curve Γs1 of the bevel gear I 1 with a constructed tooth pair, with a curve equation as follows:
A normal tooth profile curve Γs2 of the bevel gear II 2 with a constructed tooth pair is obtained by rotating the normal tooth profile curve Γs1 of the bevel gear I 1 with a constructed tooth pair around the origin of the rectangular coordinate system σ1 by an angle of 180°, with a curve equation as follows:
A tooth surface 21 of the bevel gear I 1 with a constructed tooth pair is obtained by sweeping the normal tooth profile curve Γs1 of the bevel gear I 1 with a constructed tooth pair along a given helix, with a tooth surface equation as follows:
Similarly, a tooth surface 22 of the bevel gear II 2 with a constructed tooth pair is obtained by sweeping the normal tooth profile curve Γs2 of the bevel gear II 2 with a constructed tooth pair along a given helix, with a tooth surface equation as follows:
In the embodiment of the present disclosure, the normal tooth profile curves of the bevel gear I 1 with a constructed tooth pair and the bevel gear II 2 with a constructed tooth pair each may alternatively be a combined curve ΓL2 of a sine function curve and a tangent at an inflection point thereof, a combined curve ΓL3 of an epicycloid function curve and a tangent at an inflection point thereof, a combined curve ΓL4 of an odd power function, a combined curve ILS of a sine function, or a combined curve ΓL6 of an epicycloid function, with a curve equation as follows:
When the continuous combined curve ΓL is the combined curve ΓL2 of the sine function curve and the tangent at the inflection point thereof, the continuous combined curve ΓL2 is formed by a sine function curve ΓL22 and a tangent ΓL21 at an inflection point of the sine function curve; a rectangular coordinate system is established at the tangent point of the continuous combined curve, and an equation of the combined curve ΓL2 of the sine function curve and the tangent at the inflection point thereof is as follows:
When the continuous combined curve ΓL is the combined curve ΓL3 of the epicycloid function curve and the tangent at the inflection point thereof, the continuous combined curve ΓL3 is formed by an epicycloid function curve ΓL32 and a tangent ΓL31 at an inflection point of the epicycloid function curve; a rectangular coordinate system is established at the tangent point of the continuous combined curve, and an equation of the combined curve ΓL3 of the epicycloid function curve and the tangent at the inflection point thereof is as follows:
When the continuous combined curve ΓL is the combined curve ΓL4 of the odd power function, the continuous combined curve ΓL4 is formed by a first odd power function curve ΓL41 and a second odd power function curve ΓL42; a rectangular coordinate system is established at the inflection point of the continuous combined curve, and an equation of the combined curve ΓL4 of the odd power function is as follows:
When the continuous combined curve ΓL is the combined curve ΓL5 of the sine function, the continuous combined curve ΓL5 is formed by a first sine function curve ΓL51 and a second sine function curve ΓL52; a rectangular coordinate system is established at the inflection point of the continuous combined curve, and an equation of the combined curve ΓL5 of the sine function is as follows:
When the continuous combined curve ΓL is the combined curve ΓL6 of the epicycloid function, the continuous combined curve ΓL6 is formed by a first epicycloid function curve ΓL61 and a second epicycloid function curve ΓL62; a rectangular coordinate system is established at the inflection point of the continuous combined curve, and an equation of the combined curve ΓL6 of the epicycloid function is as follows:
In the present disclosure, the inflection point or the tangent point of the continuous combined curve ΓL is as follows:
At the inflection point or the tangent point of the continuous combined curve, the curvature of the curve is zero, that is, the curvature radius tends to infinity. When the continuous combined curve is the combined curve of the odd power function, the combined curve of the sine function, or the combined curve of the epicycloid function, the curvature radii on two sides of the inflection point tend to infinity; or when the continuous combined curve is the combined curve of the odd power function curve and the tangent at the inflection point thereof, the combined curve of the sine function curve and the tangent at the inflection point thereof, or the combined curve of the epicycloid function curve and the tangent at the inflection point thereof, the curvature radius at the inflection point on the side of the odd power function curve, the sine function curve or the epicycloid function curve tends to infinity, and the curvature radius on the side of the tangent is infinite. The curvature radius of the combined curve is calculated based on given parameters in the embodiment, as shown in
In the present disclosure, the inflection point or the tangent point of the continuous combined curve is a designated point located on a meshing force action line of the bevel gear pair. The designated point is specifically defined as a given point at a pitch point or near the pitch point on the meshing force action line of the bevel gear pair with a constructed tooth pair that is a straight line which forms a certain angle (pressure angle) with a horizontal axis by means of the pitch point.
According to the principle of gear meshing, it can be known that there is no relative sliding between tooth surfaces when the bevel gear pair with a constructed tooth pair meshes at the pitch point.
It should be noted that it is obvious to those skilled in the art that the present disclosure is not limited to the details of the above exemplary embodiments, and that the present disclosure can be implemented in other specific forms without departing from the spirit or basic features of the present disclosure. Therefore, the embodiments should be regarded as exemplary and non-limiting in every respect. The scope of the present disclosure is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of equivalent elements of the claims should be included in the present disclosure, and any reference sign in the claims should not be construed as a limitation to the claims involved.
Specific examples are used for illustration of the principles and implementations of the present disclosure. The description of the above embodiments is merely used to help understand the method and its core ideas of the present disclosure. In addition, those of ordinary skill in the art can make modifications in terms of specific implementations and scope of use according to the ideas of the present disclosure. In conclusion, the content of this description shall not be construed as limitations to the present disclosure.
Number | Date | Country | Kind |
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202310633244.2 | May 2023 | CN | national |