Arched cylindrical gear transmission

FIELD: machine building.

SUBSTANCE: gear transmission contains drive (1) and driven (2) cylindrical wheels, their teeth are made with arched longitudinal lines and evolvent end profiles. Side surfaces of teeth of the both wheels have work sides (3, 4), by means of their interaction the rotation movement is transferred, and non-work sides (5, 6). Non-work end profiles (7, 8) creating by crossing of the non-work sides with plane at right angle to axis G of the wheel rotation, have engagement angles αnp1 and αnp2, there values exceed values of engagement angle α of work end profiles (9, 10).

EFFECT: invention allows increasing of load-carrying capacity of durability of gear operation.

5 cl, 3 dwg

 

The invention relates to machine parts, namely, gears external gear, consisting of two cylindrical gears with parallel axes and with teeth having an arched longitudinal line and involute face profiles.

The prior art discloses a cylindrical gear with two wheels from circular along the length of the teeth with involute profile of the teeth in cross-sections parallel to the face (A. S. 1509570 the USSR, IPC 4: F16H 1/08. Cylindrical gear transmission, publ. 23.09.1989).

Also, the prior art discloses a cylindrical gear train, consisting of two cylindrical gears with parallel axes, and both cylindrical gears the teeth are made with arched longitudinal lines and involute face profiles (A. S. 785569 the USSR, IPC F16H 3 1/08. Cylindrical gear transmission, publ. 07.12.1980, bull. No. 45), who adopted us as a prototype.

In the above gears left and right sides of the mechanical profile of the teeth of both cylindrical gears have the same gear corners. As a consequence, these gear teeth durability are the same in both directions. As you know, the smaller the angle, the less the thickness of the teeth around the circumference of the cavities and less tooth durability on a bend. The increase in the angle gear can improve the strength of teeth in bending, but about�altogether this leads to the sharpening of teeth around the circumference of vertices that can lead to destruction of the teeth in the operation.

The disadvantages of the known gears is that increasing the strength of teeth by increasing the angle gear is limited, as the thickness of the teeth around the circumference of the peaks decreases and simultaneously with the left and right sides of the mechanical profile of the teeth. Consequently, the sharpening of teeth around the circumference of the peaks occurs at smaller values of the angle gear. Therefore, in the known gear teeth have insufficient strength, which reduces the load capacity and the durability of the transmission.

However often there are gears transmitting rotation predominantly in one direction. In such programs it is impractical to do a full-strength teeth in both directions. Better to make the teeth more durable in the direction of influence them in the workload.

The object of the present invention is aimed at improving the load capacity and durability of the transmission.

To solve this problem in arch cylindrical gear transmission for transmitting rotational motion primarily in one direction, consisting of two cylindrical gears with parallel axes, and both cylindrical gears the teeth are made with arched longitudinal lines and involute face Pro�s, and the side surfaces of the teeth have a non-working parties and working parties, due to the interaction of which the rotary motion is transmitted, according to the invention at least one cylindrical wheel transmission angle gear outside of face profiles formed by the intersection of non-working sides of the side surfaces of the teeth with the plane perpendicular to the axis of rotation of the wheel, has a value greater than the value of the angle of the working face of the profiles formed by the intersection of the above-mentioned plane with the working sides of the side surfaces of the teeth.

The teeth of both cylindrical gears can be performed with the same nominal values of the angles of the gear outside of face profiles.

In addition, the teeth of each of the cylindrical wheels are made with these values of the angles of the gear outside of face profiles, in which the thickness of the teeth of both wheels in circles of vertices in sections perpendicular to the axes of the wheels is greater than or equal to the minimum allowed value for the thickness of the tooth on the circumference of vertices.

In some cases, it is appropriate that the thickness of the teeth of the wheel with fewer teeth was increased, and the thickness of the teeth of the wheel with a large number of teeth has been reduced. The magnitude of ΔS, which increased the thickness of the teeth of wheels with a smaller number subtipo of the pitch circle in cross section, perpendicular to the axis of the wheel equal to the value of ΔS, which reduced the thickness of the teeth of the wheel with a large number of teeth on the pitch circle in cross section perpendicular to the axis of the wheel.

The greatest load capacity have a transmission, in which the working side lateral surfaces of the teeth of cylindrical wheels with a smaller number of teeth is made convex, and the non-working side is concave.

The invention is illustrated by drawings. Fig. 1 shows the proposed gear train, transverse section along the plane of symmetry of ring gears; Fig. 2 - a section a-A of Fig. 1; Fig. 3 - remote element B of Fig. 1.

The proposed arch cylindrical gear train consists of two leading 1 and slave 2 - cylindrical gears with parallel axes. The teeth of both cylindrical wheels are made with an arched longitudinal lines and involute face profiles. The drive wheel 1 is rotating clockwise with angular velocity ω. Wheel 1 has a smaller number of teeth than the driven wheel 2. The lateral surface of both teeth cylindrical gears 1 and 2 are working sides 3, 4, due to the interaction of which the rotary motion is transmitted, and non-working sides 5, 6. Outside of face profiles 7, 8 formed by the intersection of the outside of the sides 5, 6 of the side surfaces of the teeth with the plane, �perpendicularly the axis G of rotation of the cylindrical wheel 2, have the corners snagging αNP1and αNP2whose value is greater than the value of the angle α of the working face of the profiles 9, 10.

To allow rotation of the cylindrical wheel in the opposite direction angles of engagement of αNP1and αNP2outside of face profiles 7, 8 both cylindrical wheels are made with the same nominal value.

With increasing angles of engagement outside of face profiles 7 and 8, the thickness of the teeth on the circumferences of the peaks decrease. In order to prevent the sharpened tops of the teeth, the corners of the gear outside of the mechanical profiles of the αNP1and αNP2must have such values at which the thickness of the teeth of the Sa1and Sa2in circles of peaks in cross-sections perpendicular to the cylindrical axes of the wheels is greater than or equal to the minimum allowed value for the thickness of the tooth on the circumference of vertices [Sa].

When the same values of the angles of the gear outside of face profiles 7 and 8, the cylindrical teeth of the wheel 1 with fewer teeth have a smaller thickness around the circumference of the peaks compared with the cylindrical teeth of the wheel 2 with a large number of teeth. Thus, the greater pressure angle outside face of the profiles 7 and 8, the smaller the thickness of the teeth on the circumference of vertices. In order to avoid sharpening the tops of the teeth, when some values� numbers of teeth and the corners of the gear outside of face profiles 7 and 8, it is advisable to increase the thickness of the cylindrical teeth of the wheel 1 with a smaller number of teeth by reducing the thickness of the cylindrical teeth of the wheel 2 with large the number of teeth. The magnitude of ΔS1ΔS, which increase the thickness of the teeth of the wheel I on the pitch circle in cross section perpendicular to the axis of the wheel equal to the value of ΔS2ΔS, which reduce the thickness of the teeth of the wheel 2 on the pitch circle in the same section.

The strength of any arch designs, including arch of teeth, higher load on the convex side of the arch. Therefore, to increase the load capacity of the transmission working side lateral surfaces of the cylindrical teeth of the wheel 1 with a smaller number of teeth perform is convex and non-working side is concave.

Transfer operations work as follows.

Driving wheel 1 rotates with an angular velocity ω primarily in one direction - clockwise. Due to the interaction of the working sides 3, 4 of the side surfaces of the teeth of the rotation is transmitted to driven wheel 2. If necessary, transmit the rotation in the reverse direction, gear teeth interact outside of the sides 5, 6 of the side surfaces of the teeth.

1. Arch cylindrical gear transmission for transmitting rotational motion primarily in one direction, consisting of two cylindrical gears with parallel axes, and both cylindrical gears the teeth are made with arched longitudinal lines and involute face� profiles and the side surfaces of the teeth have a non-working parties and working parties, due to the interaction of which the rotary motion is transmitted, characterized in that the at least one cylindrical wheel transmission angle gear outside of face profiles formed by the intersection of non-working sides of the side surfaces of the teeth with the plane perpendicular to the axis of rotation of the wheel, has a value greater than the value of the angle of the working face of the profiles formed by the intersection of the above-mentioned plane with the working sides of the side surfaces of the teeth.

2. Arched transmission according to claim 1, characterized in that the teeth of both cylindrical wheels are made with the same nominal values of the angles of the gear outside of face profiles.

3. Arched transmission according to claim 1, characterized in that the teeth of each of the cylindrical wheels are made with these values of the angles of the gear outside of face profiles, in which the thickness of the teeth of both wheels in circles of vertices in sections perpendicular to the axes of the wheels is greater than or equal to the minimum allowed value for the thickness of the tooth on the circumference of vertices.

4. Arched transmission according to claim 2, characterized in that the thickness of the cylindrical teeth of the wheel with a smaller number of teeth is increased, and the thickness of the teeth of the wheel with a large number of teeth is reduced, while ve�of icina ΔS, to which the increased thickness of the teeth of the wheel with fewer teeth on the pitch circle in cross section perpendicular to the axis of the wheel equal to the value of ΔS, which reduced the thickness of the teeth of the wheel with a large number of teeth on the pitch circle in cross section perpendicular to the axis of the wheel.

5. Arched transmission according to claim 1, characterized in that the working side lateral surfaces of the teeth of cylindrical wheels with a smaller number of teeth is made convex, and the non-working side is concave.



 

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