CN106321760A - Circular-arc-tooth-trace gear and rack transmission - Google Patents

Abstract

The invention discloses a rack-and-pinion drive with circular arc tooth lines. The structure of this transmission type mainly includes: arc-toothed cylindrical gear I and arc-toothed rack II. The teeth of the rack and pinion transmission with arc-shaped tooth lines are arched teeth, and the tooth lines are arc lines, which have longer contact lines during transmission, which is beneficial to improving the load-carrying capacity of the gear pair. Wherein, the tooth profile of the middle section of the gear in the transmission is an involute, and the tooth profiles of the other end sections are the envelope curves of a uniformly changing hyperbola similar to the involute, and the middle section of the rack in the transmission is The tooth profile is the same as that of the straight rack, and the tooth profile of other sections is the envelope of the conical generatrix. The installation is not sensitive to the center distance. The gear teeth are symmetrical about the middle section, and there is no axial force during transmission. The invention has large bearing capacity, high transmission efficiency, good stability, low noise and no axial force, is a new industrial basic part, and is suitable for large-scale popularization and application.

Description

Arc gear rack and pinion drive

technical field

The invention belongs to the field of mechanical transmission, and in particular relates to a rack-and-pinion drive with arc-shaped wires, in particular an arc-toothed wire gear with large bearing capacity, high transmission efficiency, good stability, low noise, and no axial force strip drive. The gear teeth of the gear in the rack and pinion transmission have two concave and convex tooth surfaces, the section line along the tooth width direction on the gear tooth tooth surface is a circular arc line, and the tooth profile on the middle section of the gear tooth is a gradual Open line, and each section contour line from the middle section of the gear tooth to the two end surfaces is a hyperbolic envelope with a uniform transition, and the gear teeth have geometric characteristics that are symmetrical about the middle section; the rack teeth in the rack and pinion transmission The section lines along the tooth width direction on the surface are all straight lines, and the tooth profile angles of the convex and concave tooth profiles on the middle section of the gear teeth are the same, and the tooth profile is the same as that of the straight rack with the same modulus, and from The contour lines of each section from the middle section to the two end faces of the gear tooth are the envelope lines of the conical generatrix, and the gear teeth have geometric characteristics that are symmetrical about the middle section.

Background technique

Rack and pinion transmission is a commonly used transmission device in the machinery industry. It has the advantages of stable transmission, high efficiency, and large carrying capacity. It is widely used in machine tools, food machinery, woodworking machinery, medical equipment, financial equipment and other mechanical engineering fields. However, with the continuous development of various engineering fields, higher requirements are put forward for the comprehensive performance of rack and pinion transmission.

In the rack and pinion transmission system at the present stage, straight teeth, helical gears and herringbone teeth are more common tooth forms, but there are some obvious defects in the rack and pinion transmission pairs using these types of tooth lines. In the gear tooth meshing process of the spur gear rack drive, the gear teeth are meshed in and out simultaneously along the entire tooth width, and the load on the gear teeth presents a large mutation, which is prone to shock and vibration during the meshing process. The contact line of the helical gear and rack transmission is not parallel to the axis, and the axial component force will be generated during the transmission, the shaft system structure is complicated, and the friction loss increases. There is an undercut in the middle of the gear of the herringbone gear rack drive, which increases the overall size of the equipment and the material consumption. At the same time, it is difficult to guarantee its symmetry during assembly, and the gears must adopt floating supports, which may easily cause unbalanced loads and axial movement of floating gears, increase meshing vibration, and accelerate the failure of transmission pairs.

The object of the present invention is to provide a novel and unique arc-shaped rack and pinion drive for the shortcomings of the above-mentioned rack and pinion drive, especially a gear with large load capacity, high transmission efficiency, good stability, and low noise. Rack and pinion transmission with low and no axial force. The contact line of this kind of rack and pinion transmission is longer than that of the spur gear and rack transmission with the same parameters, and combined with the characteristics of its concave and convex tooth surface, its bearing capacity is higher than that of the spur gear and rack transmission, and its teeth are the same as herringbone Like the rack and pinion transmission, they all have the characteristics of symmetry about the cross section. During the transmission process, the large axial force when using the helical gear and rack transmission is avoided. The concave-convex tooth surface of the arc can realize automatic centering, convenient assembly, and the straightness of its transmission can be improved at the same time. To sum up, this rack and pinion transmission type can replace the existing rack and pinion transmission type and realize large-scale industrial application.

Contents of the invention

In order to overcome the deficiencies and problems of the traditional rack and pinion transmission form in the production and transmission process, and keep the advantages of the traditional rack and pinion transmission form in the transmission process as much as possible, the purpose of the present invention is to provide a new type of gear tooth Rack transmission, especially a new type of rack and pinion transmission with high load capacity, high transmission efficiency, good stability, low noise, and no axial force-arc tooth wire rack and pinion transmission.

A rack-and-pinion transmission with circular arc tooth lines, including: arc tooth line cylindrical gears (I): gear entities (1), gear teeth (2), tooth concave surfaces (3), tooth convex surfaces (4), Concave transition circle (5), convex transition circle (6), tooth top surface (7), concave/convex tooth line (8/8'), tooth front surface (9), tooth rear surface (10), Concave/convex mid-section tooth profile (11/11'), concave front/rear end face tooth profile (12/12'), convex front/rear end face tooth profile (13/13'); circular arc tooth Rack (Ⅱ): Rack entity (14), rack tooth (15), tooth concave surface (16), tooth convex surface (17), concave surface transition circle (18), convex surface transition circle (19), gear tooth Top surface (20), concave/convex tooth line (21/21'), tooth front surface (22), tooth rear surface (23), concave/convex mid-section tooth profile (24/24'), concave Front/rear face profile (25/25'), Convex front/rear face profile (26/26').

Further, the concave-convex tooth surface of the gear in the rack-and-pinion transmission, its tooth line is an arc line on a plane developed along a certain generatrix of the cylindrical gear, and the concave/convex tooth surface of the rack in the rack-and-pinion transmission The line is an arc line, and the rack and pinion pair formed by it has a longer contact line during transmission.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and implementation examples.

Fig. 1 is an axonometric view of the rack-and-pinion drive of the present invention.

Fig. 2 is an axonometric view of the gear of the arc-toothed rack-and-pinion transmission of the present invention.

Fig. 3 is a view of the front end of the gear of the arc-shaped rack-and-pinion transmission of the present invention.

Fig. 4 is a rear end view of the gear of the arc-shaped rack-and-pinion transmission of the present invention.

Fig. 5 is an axonometric view of the rack of the arc-shaped rack-and-pinion transmission of the present invention.

Fig. 6 is a view of the front end of the rack of the arc-shaped rack-and-pinion transmission of the present invention.

Fig. 7 is a rear end view of the rack of the arc-toothed rack-and-pinion transmission of the present invention.

Claims (5)

1. an arc tooth line rack pinion, it is characterised in that including: arc tooth cylindrical gear (I), arc tooth line tooth Bar (II)；Arc tooth cylindrical gear (I) including: gear entity (1), gear tooth (2), gear teeth concave surface (3), gear teeth convex surface (4), concave surface transition circle (5), convex surface transition circle (6), wheel crest top land (7), male female face tooth trace (8/8 '), gear teeth front end face (9), Gear teeth rear end face (10), middle section flank profil line, male female face (11/11 '), concave surface front/rear end-tooth profile (12/12 '), convex surface Front/rear end-tooth profile (13/13 ')；Arc tooth line tooth bar (II) including: tooth bar entity (14), the tooth bar gear teeth (15), wheel mark of mouth Face (16), gear teeth convex surface (17), concave surface transition circle (18), convex surface transition circle (19), wheel crest top land (20), male female face tooth trace (21/21 '), gear teeth front end face (22), gear teeth rear end face (23), middle section flank profil line, male female face (24/24 '), concave surface are front/rear End-tooth profile (25/25 '), convex surface front/rear end-tooth profile (26/26 ').

2. arc tooth line rack pinion as claimed in claim 1, it is characterised in that compared with conventional gears tooth bar, should Rack pinion is first enveloped, enters engagement from tooth bar or gear root, by tooth bar or gear top from centre to both sides Exit engagement.

3. arc tooth line rack pinion as claimed in claim 1, it is characterised in that: the gear teeth of described rack pinion For arch, having concavo-convex two flank of tooth, the gear teeth are symmetrical about its middle section.

4. arc tooth line rack pinion as claimed in claim 1, it is characterised in that: the gear of described rack pinion The male female flank of tooth middle section flank profil line of the gear teeth be involute, its each end-tooth profile being parallel to middle section is even variation Hyp envelope；The male female flank of tooth middle section flank profil line of the gear teeth of the tooth bar of described rack pinion and same modulus The flank profil line of spur rack is identical, and its each end-tooth profile being parallel to middle section is the envelope of element of cone.

5. arc tooth line rack pinion as claimed in claim 1, it is characterised in that: the gear of described rack pinion Male female face tooth trace is one section of circular arc line in the plane launched along a certain bus of roller gear；Described rack pinion Tooth bar male female face tooth trace is one section of circular arc line.