CN210830326U

CN210830326U - Bevel gear set

Info

Publication number: CN210830326U
Application number: CN201921246522.4U
Authority: CN
Inventors: 谭永胜; 谭永利
Original assignee: Jinhua Yuchen Powder Metallurgy Co ltd
Current assignee: Jinhua Yuchen Powder Metallurgy Co ltd
Priority date: 2019-08-03
Filing date: 2019-08-03
Publication date: 2020-06-23
Anticipated expiration: 2029-08-03

Abstract

The utility model belongs to the technical field of gear structure, refer in particular to a bevel gear group, gear wheel and pinion including intermeshing, big, pinion are the dogtooth, the one end of gear wheel is provided with evenly distributed's cusp arch, and a plurality of cusp archs form the profile surface, the other end of gear wheel be provided with the profile modeling flank of profile surface looks adaptation, the profile modeling flank also comprises evenly distributed's cusp arch to, profile modeling flank's cusp arch and profile modeling face's cusp arch dislocation mutually, the tooth width of pinion is greater than the tooth width of gear wheel, and the pinion is through the tooth width that is greater than the gear wheel with more extensive cooperation assembly between them, the utility model provides a simple structure and stable bevel gear group.

Description

Bevel gear set

Technical Field

The utility model belongs to the technical field of gear structure, refer in particular to a bevel gear group.

Background

The gear is one of necessary parts in mechanical transmission, especially a bevel gear, and the application and application range are wider. Bevel gears are used to transmit motion and power between two intersecting shafts, and in general machines, the angle of intersection between two shafts of a bevel gear is equal to 90 °. However, the existing bevel gear production has the following problems: a. the bevel gear is high in machining cost, the loss rate of raw materials of a product is high in the traditional milling and planing machining process, machining damage exists on the machined surface, multiple processes are needed for repairing in the later period, machining is complex, and waste products are easy to generate in the machining process; b. in order to overcome the problem of raw material loss, a powder metallurgy processing mode is adopted, but the strength of the bevel gear is difficult to guarantee, the use requirement does not reach the standard, and effective batch production cannot be carried out.

Disclosure of Invention

The utility model aims at providing a simple structure and stable bevel gear group.

The purpose of the utility model is realized like this:

a bevel gear group comprises a large gear and a small gear which are meshed with each other, wherein the large gear and the small gear are both arc teeth, one end of the large gear is provided with tooth-shaped bulges which are uniformly distributed, a plurality of tooth-shaped bulges form a tooth-shaped surface, the other end of the large gear is provided with a profiling tooth surface matched with the tooth-shaped surface, the profiling tooth surface is also formed by the tooth-shaped bulges which are uniformly distributed, and the tooth-shaped bulges of the profiling tooth surface are staggered with the tooth-shaped bulges of the tooth-shaped surface,

the tooth width of the small gear is larger than that of the large gear, and the small gear is matched with the large gear in a wider range through the tooth width larger than that of the large gear.

The large gear is formed by die casting through a powder metallurgy process, and in order to improve the hardness/strength of the tooth surface of the large gear, a profiling tooth surface is arranged on the back of the tooth surface of the large gear so as to improve the powder pressing density.

The tooth width of the small gear is more than or equal to 1.5 times of the tooth width of the large gear, and the tooth width of the large gear is less than or equal to the radius of one third of the large gear.

The crown pitch of the pinion is N, and when the big gear and the pinion are meshed, the part of the pinion with the crown pitch is exposed outside.

The crown pitch of the pinion is less than or equal to 1/3 of the tooth width.

The two axes of the large gear and the small gear intersect, and the intersection angle between the two axes of the large gear and the small gear is 90 deg.

The middle of the gear wheel at one end of the tooth-shaped surface is inwards sunken to form a sunken part, the sunken part is at least provided with two blind holes/through holes, and the middle parts of the gear wheel and the pinion are provided with through holes.

The bull gear uses the middle part through-hole as the benchmark, the circle of depressed part is jumped 0.08.

And the machining error of the addendum circle and the dedendum circle of the large gear is-0.2-0.1.

The tip angle of the large gear is c, a is more than or equal to 70 degrees and less than or equal to 77 degrees, the root angle of the large gear is d, and the difference between the root angle and the tip angle is less than 10 degrees.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

1. the large gear of the utility model is die-cast by adopting the powder metallurgy process, thereby realizing the high-efficiency utilization of raw materials; in order to fundamentally solve the problem of the strength of the tooth-shaped surface of the large gear, the profiling tooth surface is arranged on the opposite side of the tooth-shaped surface, and the tooth-shaped protrusions of the profiling tooth surface are staggered with the tooth-shaped protrusions of the tooth-shaped surface, so that the structure can ensure that the actual thickness between the tooth-shaped surface and the profiling tooth surface is guaranteed, and the powder at the position of the tooth-shaped surface can be pressed at higher density in the powder metallurgy process, thereby directly improving the working strength and hardness of the tooth-shaped surface. The root cause for the profile tooth surface is: in the powder metallurgy process, the uneven thickness between the tooth-shaped surface and the profiling tooth surface is avoided, the powder density of the tooth-shaped surface position is ensured, and the working strength and hardness of the tooth-shaped surface are ensured.

2. The utility model discloses a tooth width of pinion is greater than the tooth width of gear wheel, and the pinion is through the tooth width that is greater than the gear wheel with the assembly between them of wider cooperation, is close to or the in-process of keeping away from between big, the pinion, as long as tooth face between them still meshes mutually, just can the mutual drive, through the tooth width that differs, enlarges application range between them, and, the tooth width more than or equal to 1.5 times of gear wheel tooth width of pinion for one set of gear train can be used in multiple equipment, and this structure can compensate the problem that wearing and tearing/not hard up between the use gear train moreover.

3. The utility model discloses a crown pitch of pinion is N, and when big, pinion mesh mutually, the position that has the crown pitch of pinion exposes outside, and the crown pitch is the benchmark that the pinion was made, and through the meshing backlash behind the better assurance system tooth of crown pitch, guarantee the product precision moreover to, the crown pitch of pinion 1/3 of less than or equal to the tooth width to guarantee the actual mounted position stability behind big, the pinion meshing.

4. The utility model discloses the gear wheel inwards caves in the middle part of profile of tooth face one end and forms the depressed part, and the depressed part both can get rid of stress concentration's problem, has saved raw and other materials again to the depressed part sets up two blind hole/through-holes at least, and preferably three blind hole, blind hole are arranged in the in-service use, carry out the scram the stability of structure is guaranteed to the gear wheel.

5. Big, the pinion middle part is provided with the through-hole, and this through-hole is used for external rotation source, can add the keyway according to the requirement of in-service use in consequently the through-hole to the through-hole is big, the processing benchmark of pinion, and the terminal surface of depressed part is as assistance-localization real-time, and consequently the terminal surface circle of depressed part beats and is 0.08, guarantees the manufacturing stability of gear wheel through many places location.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is the schematic view of the internal structure of the gear wheel of the present invention

FIG. 3 is one of the structural diagrams of the bull gear of the present invention;

fig. 4 is a second schematic structural view of the gearwheel of the present invention;

fig. 5 is a third schematic view of the gearwheel structure of the present invention;

fig. 6 is a fourth schematic view of the gearwheel structure of the present invention.

In the figure: 1-pinion gear; 10-pinion through hole; 2-a bull gear; 21-a recess; 22-blind hole; 23-tooth-shaped surface tooth-shaped protrusions; 24-profile tooth flank tooth-like projections; 25-bull gear through holes; a-a toothed surface; b-profile tooth surface.

Detailed Description

The invention will be further described with reference to the following detailed description of embodiments, with reference to the accompanying drawings, in which figures 1-6 show:

a bevel gear set comprises a large gear 2 and a small gear 1 which are meshed with each other, wherein the large gear 2 and the small gear 1 are both arc teeth, namely a curved-tooth bevel gear, and the curved-tooth bevel gear has the advantages of high contact ratio, strong bearing capacity, stable transmission and low noise. One end of the gearwheel 2 is provided with uniformly distributed tooth-shaped surface tooth-shaped protrusions 23, a plurality of tooth-shaped surface tooth-shaped protrusions 23 form a tooth-shaped surface a, the other end of the gearwheel 2 is provided with a profiling tooth surface b matched with the tooth-shaped surface a, the profiling tooth surface b is also composed of uniformly distributed profiling tooth-shaped protrusions 24, the tooth-shaped protrusions of the profiling tooth surface and the tooth-shaped protrusions of the tooth-shaped surface are substantially identical in structure and only staggered, the structure can guarantee the actual thickness between the tooth-shaped surface a and the profiling tooth surface b, and in the powder metallurgy process, the density of powder at the position of the tooth-shaped surface a can be higher in pressing mode, so that the working strength and hardness of the tooth-shaped surface a are directly improved. The root cause of the profile tooth surface b is: in the powder metallurgy process, the uneven thickness between the tooth surface a and the profiling tooth surface b is avoided, the powder density of the tooth surface a is ensured, and the working strength and hardness of the tooth surface a are guaranteed.

The tooth width of the small gear 1 is larger than that of the big gear 2, the small gear 1 is matched with the big gear 2 in a larger range through the tooth width larger than that of the big gear 2, when the big gear 1 and the small gear 2 are close to or far away from each other, the small gear 1 can be mutually transmitted as long as tooth surfaces of the big gear and the small gear are meshed with each other, the using range of the big gear and the small gear is enlarged through different tooth widths, in addition, the tooth width of the small gear 1 is larger than or equal to 1.5 times of the tooth width of the big gear 2, so that one set of gear set can be used on various devices, and the structure can make up the problem of abrasion/.

The large gear 2 is formed by die casting through a powder metallurgy process, and in order to improve the hardness/strength of the tooth surface of the large gear 2, a profiling tooth surface b is arranged on the back of the tooth surface a of the large gear 2 so as to improve the powder pressing density. The large and

small pinions

1,2 of the present application are manufactured by the following steps: 1. preparing and mixing the powder, namely mixing the metal powder and various auxiliary materials according to a certain proportion and then uniformly mixing the mixture by a mixer; 2. powder pressing, namely filling the mixture into a pressing die, and pressing and molding on a press; 3. sintering, wherein the sintering temperature is lower than the melting point of metal and alloy in the material and higher than the melting point of fusible components in the auxiliary material; 4. and the subsequent treatment, shaping, oil immersion, heat treatment and the like. The small gear 1 is a matched gear of the big gear 2, and the requirement of the small gear is higher than that of the big gear 2, so that the small gear 1 is processed and manufactured by adopting the traditional machining process. The pinion 1 is adapted by optimization and parameters, the specific important parameters being described in detail below.

The tooth width of the small gear 1 is more than or equal to 1.5 times of the tooth width of the large gear 2, so that one set of gear set can be used on various devices, the structure can make up the problem of abrasion/looseness among the gear sets in the using process, and the tooth width of the large gear 2 is less than or equal to the radius of one third of the large gear 2, so that the stability of the large gear 2 is ensured.

The crown pitch of the pinion 1 is N, when the large and

small gears

1 and 2 are meshed, the part of the pinion 1 with the crown pitch is exposed outside, the crown pitch is the reference for manufacturing the pinion 1, the meshing backlash after tooth manufacturing is better ensured through the crown pitch, the product precision is ensured, and the crown pitch of the pinion 1 is less than or equal to 1/3 of the tooth width, so that the stability of the actual mounting position after the large and

small gears

2 and 1 are meshed is ensured.

The two axes of the large gear 2 and the small gear 1 intersect, and the intersection angle between the two axes of the large gear 2 and the small gear 1 is 90 degrees, so that vertical transmission is performed.

The middle of the large gear 2 at one end of the tooth-shaped surface a is inwards sunken to form a sunken part 21, the sunken part 21 can solve the problem of stress concentration and save raw materials, at least two blind holes 22/through holes are formed in the sunken part 21, preferably three blind holes 22 are formed, the blind holes 22 are used for emergency stop in the actual use process, and the stability of the structure is guaranteed by the large gear 2.

The middle parts of the big gear 2 and the small gear 1 are provided with through holes, as shown in the figure, the big gear through hole 25 and the small gear through hole 10 are used for externally connecting a rotation source, key grooves can be added into the big gear through hole 25 and the small gear through hole 10 according to actual use requirements, the big gear through hole 25 and the small gear through hole 10 are processing references of the big gear 2 and the

small gear

2 and 1, the end face of the concave part 21 of the big gear 2 is used as auxiliary positioning, the end face circular run-out of the concave part 21 is 0.08, and the manufacturing stability of the big gear 2 is ensured through multiple positioning.

The machining error of the addendum circle and the dedendum circle of the large gear 2 is-0.2-0.1. The tip cone angle of the large gear 2 is c, a is more than or equal to 70 degrees and less than or equal to 77 degrees, the root cone angle of the large gear 2 is d, and the difference value between the root cone angle and the tip cone angle is less than 10 degrees. Through precision control, only can a gear which is in compliance and standard can be produced, and the assembled product has longer service life and stronger stability.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A bevel gear set comprising a gearwheel (2) and a pinion (1) that mesh with each other, characterized in that: the large gear and the small gear (2,1) are both arc teeth, one end of the large gear (2) is provided with tooth-shaped bulges which are uniformly distributed, a plurality of tooth-shaped bulges form a tooth-shaped surface (a), the other end of the large gear (2) is provided with a profiling tooth surface (b) which is matched with the tooth-shaped surface (a), the profiling tooth surface (b) is also composed of the tooth-shaped bulges which are uniformly distributed, and the tooth-shaped bulges of the profiling tooth surface (b) are staggered with the tooth-shaped bulges of the tooth-shaped surface (a),

the tooth width of the small gear (1) is larger than that of the large gear (2), and the small gear (1) is matched with the large gear (2) in a larger range through the tooth width larger than that of the large gear.

2. The bevel gear set of claim 1 wherein: the large gear (2) is formed by die casting through a powder metallurgy process, and in order to improve the hardness/strength of the tooth surface of the large gear (2), a profiling tooth surface (b) is arranged on the back of the tooth-shaped surface (a) of the large gear (2) so as to improve the powder pressing density.

3. The bevel gear set according to claim 1 or 2, characterized in that: the tooth width of the small gear (1) is more than or equal to 1.5 times of the tooth width of the large gear (2), and the tooth width of the large gear (2) is less than or equal to one third of the radius of the large gear (2).

4. The bevel gear set according to claim 1 or 2, characterized in that: the crown pitch of the pinion (1) is N, and when the big pinion (1) and the pinion (2) are meshed, the part of the pinion (1) with the crown pitch is exposed outside.

5. The bevel gear set of claim 4 wherein: the crown pitch of the pinion (1) is less than or equal to 1/3 of the tooth width.

6. The bevel gear set of claim 1 wherein: the two axes of the large gear (2) and the small gear (1) are intersected, and the intersection angle between the two axes of the large gear (2) and the small gear (1) is 90 degrees.

7. The bevel gear set of claim 1 wherein: the middle of one end of the tooth-shaped surface (a) of the large gear (2) is inwards recessed to form a recessed part (21), the recessed part (21) is at least provided with two blind holes (22)/through holes, and the middle parts of the large gear (2) and the small gear (1) are provided with the through holes.

8. The bevel gear set of claim 7 wherein: the bull gear (2) uses the middle through hole as the benchmark, the circle run-out of the depressed part (21) is 0.08.

9. The bevel gear set of claim 1 wherein: the machining error of the addendum circle and the dedendum circle of the large gear (2) is-0.2-0.1.

10. The bevel gear set of claim 1 wherein: the tip cone angle of the large gear (2) is c, a is more than or equal to 70 degrees and less than or equal to 77 degrees, the root cone angle of the large gear (2) is d, and the difference between the root cone angle and the tip cone angle is less than 10 degrees.