Gear tooth belt drive structure

Abstract

The application discloses a gear and toothed belt transmission structure, which comprises an oblique round tooth cylindrical gear and a toothed belt matched with the oblique round tooth cylindrical gear. The oblique round tooth cylindrical gear comprises a base cylinder, a plurality of same oblique gear teeth are uniformly and interval arranged on the side surface of the base cylinder, the normal tooth profile of the oblique gear tooth is a continuous circular arc with a radius of r, the center of the circular arc is on the side surface of the base cylinder and the tooth column is swept along the axial direction with a certain spiral angle β1, the both ends of the tooth column comprise a spherical body which is smoothly connected with the tooth column, the radius of the spherical body is equal to the radius of the normal tooth profile, the toothed belt comprises a bottom plate, the bottom plate is provided with meshing tooth grooves matched with the oblique gear teeth, the vertical width of the opposite sides of the tooth groove is equal to the diameter of the normal section circle of the oblique gear tooth, the included angle β2 between the tooth groove and the projection of the gear axis is equal to the spiral angle β1 of the gear, the interval P2 of the adjacent tooth grooves is equal to the pitch P1 of the oblique round tooth cylindrical gear, and the projection of the length direction of the corresponding sides of the adjacent two oblique gear teeth on the side surface of the base cylinder is overlapped.

Description

TECHNICAL FIELD

[0001] The present application relates to a gear and tooth belt transmission structure. BACKGROUND

[0002] The conventional involute gear and rack transmission can only provide linear motion meshing transmission, and the conventional gear transmission can only provide circumferential motion meshing motion, and the conventional gear and rack transmission cannot realize the meshing transmission of linear, fixed curvature curve and variable curvature curve motion. For the two-dimensional curve of the storage tank pipeline of the petrochemical nuclear power industry, the ship body and the welding or detection equipment, it is best to make precise motion along the curve. The transmission device of the oblique circular tooth cylindrical gear and the matching tooth belt can well realize the precise meshing transmission of arbitrary two-dimensional curve motion. SUMMARY

[0003] The purpose of the present application is to provide a gear and tooth belt transmission structure which can realize linear, circular and arbitrary two-dimensional curve motion meshing transmission.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] A gear and tooth belt transmission structure, comprising an oblique circular tooth cylindrical gear and a tooth belt matched with the oblique circular tooth cylindrical gear, the oblique circular tooth cylindrical gear comprising a base cylinder, the diameter of the base cylinder being the pitch circle diameter of the oblique circular tooth cylindrical gear, a plurality of identical oblique gear teeth being uniformly and spaced apart arranged on the side surface of the base cylinder, the normal tooth profile of the oblique gear tooth being a continuous circular arc with a radius r, the helix angle β1 of the oblique circular tooth cylindrical gear being the included angle between the direction of the normal tooth profile swept by the oblique gear tooth and the generatrix of the side surface of the pitch circle cylinder, the tooth cylinder being formed by the circular arc with the center on the side surface of the base cylinder and swept along the axial direction of the base cylinder at a certain helix angle β1, the tooth belt comprising a bottom plate, the bottom plate being provided with meshing tooth grooves matched with the oblique gear teeth, the vertical width of the opposite sides of the tooth groove being equal to the diameter of the normal cross section circle of the oblique gear tooth, the included angle β2 between the tooth groove and the axial projection of the oblique circular tooth cylindrical gear being equal to the helix angle β1 of the gear, the directions of the two helix angles being opposite, the linear interval between any two adjacent tooth grooves on the tooth belt being referred to as the pitch P2 of the tooth belt, the pitch P2 being equal to the pitch P1 of the oblique circular tooth cylindrical gear, the pitch P1 being the arc length corresponding to the interval on the side surface of the base cylinder of any two adjacent oblique gear teeth, the projections of the corresponding sides of the adjacent two oblique gear teeth on the length direction developed on the side surface of the base cylinder being coincident.

[0006] The helix angle β1 is 0-90 degrees.

[0007] The tooth belt is rigid or flexible.

[0008] The tooth belt is a straight tooth belt, a closed ring-shaped tooth belt or an arbitrary two-dimensional curve tooth belt.

[0009] Guide edges are provided on the bottom plates at both ends of the tooth groove to enable higher precision in movement.

[0010] The helical cylindrical gears are arranged in pairs with equal helix angles and opposite directions of rotation. The toothed belts that mesh with them consist of two arrays of symmetrically arranged tooth grooves.

[0011] The toothed column includes ball heads at both ends that smoothly transition into the toothed column. The radius of the ball head is equal to the normal tooth profile radius, and the ball head intersects with the side surface of the base cylinder.

[0012] The helical cylindrical gears are arranged in pairs with opposite directions of rotation, and the tooth belt that matches the pair of helical cylindrical gears includes two rows of tooth grooves with opposite directions of rotation.

[0013] The pair of helical cylindrical gears are connected by a shaft, and guide parts A are connected to both ends of the shaft. The guide part A includes a vertical plate A connected to the shaft, and two guide rollers are spaced apart on the inner side of the vertical plate A. The guide edge is sandwiched between the two guide rollers.

[0014] The pair of helical cylindrical gears are connected by a shaft, and guide parts B are connected to both ends of the shaft. The shaft of the guide part B is connected to a vertical plate B, and a roller is provided at the lower end of the vertical plate. The two rollers are correspondingly clamped on both sides of the toothed belt in the width direction of the toothed belt.

[0015] The beneficial effects of the present invention are as follows: The transmission structure of the helical cylindrical gear and its matching toothed belt of the present invention is used for gear meshing transmission on rigid or flexible straight toothed belts, or gear meshing transmission on large-diameter rigid or flexible annular toothed belts, or gear meshing transmission on rigid or flexible curved toothed belts. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0017] Figure 2A This is a three-dimensional structural diagram of a helical cylindrical gear according to an embodiment of the present invention;

[0018] Figure 2B for Figure 2A Front view structural diagram;

[0019] Figure 2C for Figure 2A A schematic diagram of the side view structure;

[0020] Figure 2D This is a schematic diagram showing the normal tooth profile of a helical cylindrical gear.

[0021] Figure 2E This is an unfolded view of the helical cylindrical gear according to an embodiment of the present invention;

[0022] Figure 2F for Figure 2E A partially enlarged structural diagram;

[0023] Figure 3A This is a three-dimensional structural diagram of the toothed belt according to an embodiment of the present invention;

[0024] Figure 3B for Figure 3A A partial top-view structural diagram;

[0025] Figure 3C A schematic diagram of several arrayed tooth grooves;

[0026] Figure 4A This is a three-dimensional structural schematic diagram of another embodiment of the present invention;

[0027] Figure 4B This is a three-dimensional structural schematic diagram of another embodiment of the present invention;

[0028] Figure 5 A three-dimensional structural diagram of the present invention in use. Figure one ;

[0029] Figure 6 This is a two-dimensional structural diagram of the present invention in use. Detailed Implementation

[0030] Please see Figures 1 to 6The gear tooth belt transmission structure of the application comprises an oblique round tooth cylindrical gear 1 and a tooth belt 2 matched with the oblique round tooth cylindrical gear. The oblique round tooth cylindrical gear 1 comprises a base cylinder 11 with a diameter equal to the pitch circle diameter D of the oblique round tooth cylindrical gear. A plurality of identical oblique gear teeth 12 are uniformly and spacedly arranged on the side surface of the base cylinder 11. The normal tooth profile A of the oblique gear tooth is a continuous circular arc with a radius r. The helix angle β1 of the oblique round tooth cylindrical gear is the included angle between the direction of the normal tooth profile swept by the oblique gear tooth and the generatrix of the side surface of the pitch circle cylinder. The tooth cylinder is formed by the circular arc with its center on the side surface of the base cylinder and swept along the axial direction of the base cylinder at a certain helix angle β1. The convex cylinder 121 comprises a spherical head 122 smoothly connected to the convex cylinder at both ends. The radius of the spherical head 122 is equal to the radius r of the normal tooth profile A of the oblique gear tooth. The spherical head is used to make the transition of the oblique gear tooth to the side surface of the base cylinder smoother and to facilitate the axial positioning of the gear tooth in the tooth groove. The tooth belt 2 comprises a bottom plate provided with meshing tooth grooves 21 matched with the oblique gear tooth. The vertical width W of the opposite sides of the tooth groove 21 is equal to the diameter 2r of the normal section circle of the oblique gear tooth. The included angle β2 between the tooth groove and the axial projection of the oblique round tooth cylindrical gear is equal to the helix angle β1 of the gear, which is 0-90 degrees, preferably 10-70 degrees. The direction of rotation of the oblique gear tooth is opposite to that of the tooth groove. The linear interval (the interval is a concept opposite to the interval of the arc length of the gear, i.e. the interval of the adjacent tooth grooves) between any two adjacent tooth grooves on the tooth belt is referred to as the pitch P2 of the tooth belt. The pitch P2 is equal to the pitch P1 of the oblique round tooth cylindrical gear. The pitch P1 is the arc length corresponding to the interval of any two adjacent oblique gear teeth on the side surface of the base cylinder. The projections of the corresponding sides of the two adjacent oblique gear teeth on the length direction of the side surface of the base cylinder are coincident.

[0031] The tooth belt is a straight tooth belt, a closed ring tooth belt or a tooth belt with any two-dimensional curve.

[0032] Specifically, as shown in Figure 1 The left-handed oblique round tooth cylindrical gear 1 is engaged with the matched tooth belt 2.

[0033] As shown in Figures 2A to 2FAs shown, the normal tooth profile A of the helical gear tooth of the helical spur gear 1 is a continuous circular arc of a circle with radius r, and the center of the circle is on the side surface of the base cylinder 11. In the normal cross section of the tooth, the tooth profile of the continuous circular arc with radius r is swept along the gear axis direction on the pitch circle cylindrical side surface with diameter D with a certain helix angle β1 to form the tooth profile, where the length B is called the tooth width, and the angle between the sweeping direction of the normal tooth profile of the helical gear tooth and the generatrix of the pitch circle cylindrical surface is called the helix angle β1 of the gear. On the base cylindrical side surface of the gear, a plurality of helical gear teeth are uniformly distributed on the circumference of the pitch circle. Among them, the arc length corresponding to the interval of any two adjacent helical gear teeth on the pitch circle is called the pitch P1 of the gear. At both ends of the tooth, in order to smoothly transition the helical gear tooth and the pitch circle cylindrical surface, a spherical head with a radius of r is machined to connect the pitch circle cylindrical surface. In the development diagram of the helical spur gear, the projection of the corresponding edges of the two adjacent helical gear teeth on the length direction of the development of the pitch circle cylindrical surface has an overlapping segment H1, so as to ensure that when the gear is engaged with the tooth belt, the coincidence degree coefficient is greater than or equal to 1.

[0034] As shown, Figures 3A to 3C The tooth belt 2 is a long strip-shaped belt material with a certain thickness, and an array of tooth grooves is machined on the bottom plate of the tooth belt at equal intervals. The tooth groove 21 matches the helical gear tooth, that is, the shape of the tooth groove 21 can be concave-convex fitted with the shape of the helical gear tooth, the normal width of the tooth groove is equal to the tooth thickness of the gear tooth, and the circular arc radius at both ends of the tooth groove is equal to the radius of the gear tooth. The angle between the direction of the tooth groove on the tooth belt 2 and the width direction of the tooth belt is β2. The linear interval of any two adjacent tooth grooves on the tooth belt 2 is called the pitch P2 of the tooth belt. The material of the tooth belt 2 can be a long strip-shaped metal plate, plastic, etc.; the tooth belt can be soft or hard. The projection of the same edge of the two adjacent tooth grooves 21 on the length direction of the tooth belt has an overlapping segment H2, and H2=H1, so as to ensure that when the tooth belt is engaged with the gear, the coincidence degree coefficient of the engagement is greater than or equal to 1.

[0035] In the present application, for a pair of gears and tooth belts that can be correctly engaged, the pitch P2 of the tooth belt is equal to the pitch P1 of the gear. At the same time, on the tooth belt, the normal width of the tooth groove is equal to the diameter of the helical gear tooth, which is 2r. At the same time, β2 on the tooth belt 2 is equal to the helix angle β1 of the gear, and the helix directions are opposite.

[0036] As shown, Figure 4A and Figure 4B As shown, in one embodiment of the use state of the present application, in a conventional application, in order to optimize the stress condition of the transmission pair and improve the carrying capacity, balance the axial force of a single gear and a single direction tooth groove array tooth belt, a pair of helical spur gears with equal helix angles and opposite helix directions are generally used: left-handed gear and right-handed gear form a set of herringbone gears. Correspondingly, the tooth belt engaged with the herringbone gears is also machined with corresponding herringbone tooth grooves. The tooth belt and the herringbone gear form an engaged transmission pair. Or, further practical devices, such asFigure 4B As shown in the drawings, in order to increase the wheel track, a pair of helical spur gears, a left-handed gear and a right-handed gear, and a wheel shaft 3 are used to form a set of herringbone gear pair. Correspondingly, the toothed belt engaged with the herringbone gear pair is also processed with corresponding herringbone tooth grooves, and the toothed belt and the herringbone gear pair form a meshing transmission pair.

[0037] As shown in the drawings, Figure 5 and Figure 6 As shown in the drawings, in order to increase the wheel track, a pair of helical spur gears, a left-handed gear and a right-handed gear, and a wheel shaft 3 are used to form a set of herringbone gear pair. Correspondingly, the toothed belt engaged with the herringbone gear pair is also processed with corresponding herringbone tooth grooves, and the toothed belt and the herringbone gear pair form a meshing transmission pair. Figure 5 As shown in the drawings, the pair of helical spur gears are connected through the wheel shaft 3, and the guide part A is connected to both ends of the wheel shaft 3, the guide part A includes a vertical plate A31 connected to the wheel shaft, two guide rollers 32 are arranged on the inner side of the vertical plate A31, and the guide edge 22 is clamped between the two guide rollers 32, the pair of guide rollers clamps the toothed belt bottom plate in the thickness direction of the toothed belt, and the precise thickness of the toothed belt is used as the guide. At the same time, in order to improve the guiding accuracy of the device, as shown in the drawings, Figure 6 As shown in the drawings, Figure 5 The difference between the embodiments is only the structure of the guide part: the pair of helical spur gears are connected through the wheel shaft, and the guide part B is connected to both ends of the wheel shaft, the guide part B includes a vertical plate B41 connected to the wheel shaft, and a roller 42 is arranged at the lower end of the vertical plate, and the two rollers 42 are correspondingly clamped on the side wall of the toothed belt in the width direction of the toothed belt. The roller 42 clamps the toothed belt in the width direction of the toothed belt, and the two side edges of the precisely processed toothed belt are used as the guide.

[0038] The guide device provided with the guide roller 32 and the guide device provided with the roller 42 can be used in a set of actual machine equipment, and both devices can be configured.

[0039] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or substitutions within the technical range disclosed by the present application, which shall belong to the protection scope of the present application.

Claims

1. A gear and belt transmission structure, characterized in that: It includes a helical cylindrical gear and a toothed belt that matches the helical cylindrical gear. The helical cylindrical gear includes a base cylinder with a diameter equal to the pitch circle diameter of the helical cylindrical gear. Several identical helical teeth are evenly spaced in a ring on the side of the base cylinder. The normal tooth profile of each helical tooth is a continuous arc with a radius of r. The helix angle β1 of the helical cylindrical gear is the angle between the direction of the sweeping of the normal tooth profile and the generatrix of the side of the pitch circle cylinder. The center of the arc is on the side of the base cylinder, forming a toothed column swept along its axial direction at a helix angle β1. The toothed belt includes a base plate. The plate is provided with meshing tooth grooves that match the helical gear teeth. The vertical width of the opposite side of the tooth groove is equal to the diameter of the normal section circle of the helical gear teeth. The angle β2 between the tooth groove and the projection of the axis of the helical cylindrical gear is equal to the helix angle β1 of the gear. The two helix angles are in opposite directions. The linear interval between any two adjacent tooth grooves on the tooth belt is called the pitch P2 of the tooth belt. The pitch P2 is equal to the pitch P1 of the helical cylindrical gear. The pitch P1 is the arc length corresponding to the interval between any two adjacent helical gear teeth on the side of the base cylinder. The projections of the corresponding sides of the two adjacent helical gear teeth on the side of the base cylinder in the length direction of the unfolded length direction coincide. The toothed belt can be rigid or flexible; the toothed belt can be a straight toothed belt, a closed annular toothed belt, or a toothed belt with any two-dimensional curve. The toothed column includes ball heads at both ends that smoothly transition into the toothed column. The radius of the ball head is equal to the normal tooth profile radius, and the ball head intersects with the side surface of the base cylinder. The helical cylindrical gears are arranged in pairs with equal helix angles and opposite directions of rotation. The toothed belts that mesh with them consist of two arrays of symmetrically arranged tooth grooves. The helical cylindrical gears are arranged in pairs with opposite directions of rotation, and the tooth belt that matches the pair of helical cylindrical gears includes two rows of tooth grooves with opposite directions of rotation.

2. The gear and belt drive structure as described in claim 1, characterized in that: The helix angle β1 is from 0 degrees to 90 degrees.

3. The gear and belt drive structure as described in claim 1, characterized in that: Guide edges are provided on the bottom plates at both ends of the tooth groove to enable higher precision in movement.

4. The gear and belt transmission structure as described in claim 3, characterized in that: The pair of helical cylindrical gears are connected by a shaft, and guide parts A are connected to both ends of the shaft. The guide part A includes a vertical plate A connected to the shaft, and two guide rollers are spaced apart on the inner side of the vertical plate A. The guide edge is sandwiched between the two guide rollers.

5. The gear and belt drive structure as described in claim 3, characterized in that: The pair of helical cylindrical gears are connected by a shaft, and guide parts B are connected to both ends of the shaft. The shaft of the guide part B is connected to a vertical plate B, and a roller is provided at the lower end of the vertical plate. The two rollers are correspondingly clamped on both sides of the toothed belt in the width direction of the toothed belt.

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