CN107387730B - Herringbone gear with combined structure and processing method thereof - Google Patents
Herringbone gear with combined structure and processing method thereof Download PDFInfo
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- CN107387730B CN107387730B CN201710861788.9A CN201710861788A CN107387730B CN 107387730 B CN107387730 B CN 107387730B CN 201710861788 A CN201710861788 A CN 201710861788A CN 107387730 B CN107387730 B CN 107387730B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/12—Toothed members; Worms with body or rim assembled out of detachable parts
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Abstract
The invention relates to a herringbone gear with a combined structure and a processing method thereof, wherein the herringbone gear comprises two bevel gears respectively provided with left-handed teeth and right-handed teeth, at least two assembly pins are in interference fit with assembly pin holes correspondingly arranged on the two bevel gears along the axial direction so as to realize assembly positioning, and the two bevel gears are gathered and adhered and fixedly connected through a fastener. The number of the assembly pins is three, and the assembly pins are uniformly distributed on spokes of the two bevel gears along the circumference in an equal distribution manner; the fasteners are three bolts axially arranged, and are uniformly distributed on spokes of the two bevel gears along the circumference in an equal distribution manner; the bolts penetrate through holes correspondingly formed in spokes of the two bevel gears and are connected with nuts so as to close, fit and fixedly connect the two bevel gears. The invention utilizes the traditional gear hobbing machine, and has low equipment cost; the air-escape groove is not arranged, so that the thickness is reduced, and the weight is reduced; the tooth alignment precision is high, the running and meshing effects are good, and the left-handed and right-handed teeth are uniformly stressed; can effectively and repeatedly position and complete the reinstallation without changing the use effect.
Description
Technical Field
The invention belongs to the technical field of gears with teeth in transmission devices, and particularly relates to a herringbone gear with a combined structure and a processing method thereof.
Background
When the traditional helical gear is used, the transverse force on the shaft exists, in order to eliminate the axial force, one gear is made into a helical gear with symmetrical opposite directions, so that the axial force is eliminated, and the symmetrical gear teeth look like a herringbone gear for short. The herringbone gear has the advantages of high contact ratio, small axial load, high bearing capacity and stable work, and has wide application in the transmission system of heavy machinery.
The existing herringbone gear is manufactured in a mode of combining bevel gears of two finished products, but the problem that the paired gears are difficult in combined operation is solved, the problem that normal operation and poor engagement are caused due to low tooth accuracy, and the problem that the uniform stress effect of left-handed teeth and right-handed teeth is poor is solved, so that the advantages of the herringbone gear cannot be fully exerted. There is also a herringbone gear of an integral structure, but a degassing groove (sometimes called an overtravel groove) necessary for gear hobbing is left between the effective gear teeth on two sides so as to meet the requirements of gear hobbing stroke of a gear hobbing machine. Along with the use of numerical control machining equipment, milling machining of the herringbone gear without the overall structure of the air escape groove can be finished on a machining center, but the machining can be finished by the corresponding machining center which needs more than five shafts for linkage, the software for correspondingly programming numerical control programs and the use requirement thereof are high, the problem of personnel training is solved, the comprehensive cost is high, and the requirement of the overall structure on materials is also high; in addition, in the use process, many people in the field consider that the meshing effect of the milling gear teeth is good without the traditional gear teeth rolling and cutting, the problem of tooth surface line contact even point contact exists, the running-in period is long, the problem of large fit clearance after running-in exists, and further intensive research is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the herringbone gear with the combined structure and the processing method thereof, so that the problems that the herringbone gear with the combined structure has low tooth alignment precision and the numerical control equipment is too high in cost for processing the integrated herringbone gear due to the fact that the thickness and the weight are large due to the fact that the air-escape groove exists in the hobbing integrated herringbone gear are avoided, and the effects of fully utilizing the traditional gear processing equipment and manufacturing the herringbone gear with small thickness and high precision are achieved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the herringbone gear with the combined structure comprises two bevel gears with left-handed teeth and right-handed teeth, at least two assembly pins are in interference fit with assembly pin holes correspondingly formed in the two bevel gears along the axial direction so as to realize assembly positioning, and the two bevel gears are combined, attached and fixedly connected through a fastener.
The assembly pin holes on the herringbone gear are matched, then the assembly pin is connected and positioned, and the herringbone gear is formed by processing the herringbone gear through a traditional gear hobbing machine according to a hobbing process after being connected through a fastener, so that the existing resources are greatly utilized, and the manufacturing cost is low; the structure eliminates the air-escape groove required by the hobbing integrated herringbone gear, reduces the thickness, reduces the weight and widens the width of the effective tooth surface; the assembly pin and the fastener realize detachable and repeated positioning assembly, are convenient to clean and maintain, have high repeated positioning precision and tooth alignment precision, and have good running and meshing conditions after reinstallation.
The technical scheme is further perfected, the number of the assembly pins is three, and the assembly pins are uniformly distributed on spokes of two bevel gears along the circumference in an equal distribution manner; the fasteners are three bolts which are axially arranged, the spokes of the two bevel gears are uniformly distributed along the circumference, and the bolts are respectively arranged on the extension lines of connecting lines of the assembly pins and the centers of the herringbone gears; the bolts penetrate through holes correspondingly formed in spokes of the two bevel gears and are connected with nuts so as to close, fit and fixedly connect the two bevel gears.
Therefore, the three groups of assembly pins and the corresponding assembly pin holes have the function of preventing the failure of the combined structure, after one assembly pin hole fails, the positioning can be effectively realized by utilizing the two groups of the remaining assembly pins and the assembly pin holes, the failure of the herringbone gear of the combined structure is avoided, and meanwhile, the three groups of assembly pins and the state of the assembly pin holes can be always kept by being newly matched with a new assembly pin hole; the assembly pins and the bolts are uniformly distributed and equally distributed, so that the dynamic balance of the gear during operation can be maintained; the bolts are arranged at positions closer to the wheel rims, so that the stress condition of gear running engagement is met; the bolts and the locating pins are arranged on the same spoke line, so that the structural design requirement of the spoke is met, and weight-reducing through holes and the like are further arranged on the spoke.
Further, the thickness of the spokes of the two bevel gears is smaller than that of the rim; and a plurality of weight-reducing through holes are uniformly distributed on the spokes of the two bevel gears along the circumference in an equal distribution manner.
Therefore, the thickness of the spoke is smaller than that of the rim, and the head parts of the bolts and the nuts on the spoke can not protrude out of two side surfaces of the rim, namely two end surfaces of the gear after being fastened and connected, so that hooking is avoided, and the design of mechanical equipment for installing the herringbone gear with the structure is also facilitated; simultaneously, the weight of the gear is reduced under the condition that the strength of the gear is not reduced together with the weight-reducing through hole; the weight reducing through holes are uniformly distributed in equal parts, so that the dynamic balance of the gear during operation can be maintained.
Further, the spiral angles of the left-handed teeth and the right-handed teeth of the two bevel gears are equal; the tooth shapes of the two bevel gears are symmetrical along the joint surface; the tooth thickness of the left-handed teeth and the right-handed teeth of the two bevel gears is equal.
Thus, the gear teeth themselves perform better in operative engagement.
Further, through holes and key grooves for connecting with the rotating shaft are formed in the hubs of the two bevel gears.
Thus, the herringbone gear is convenient to connect with the rotating shaft and transmit torque.
The invention also relates to a machining method of the herringbone gear with the combined structure, which comprises the following specific steps:
1) Preparing two bevel gear primary blanks;
2) Preparing a degassing base plate, wherein the degassing base plate is a round steel plate with the diameter smaller than the diameter of the root circle of the gear teeth of the two bevel gears;
3) The degassing backing plate is arranged between the two bevel gear primary blanks, and is gathered, attached and fixedly connected through the fastening piece;
4) The assembly pin hole is matched and processed, and a pin is assembled in the assembly pin hole in an interference fit connection process; marking corresponding assembly pin holes on two surfaces of the two bevel gear blanks facing the outer sides so as to fix the corresponding relation of the assembly pin holes and the corresponding relation of the end faces of the gears;
5) Machining gear teeth on a gear hobbing machine to form the two bevel gears;
6) Dismantling the process assembly pin and the fastener, and dismantling the degassing backing plate;
7) And reassembling the two bevel gears according to the corresponding assembling pin holes and the gear end faces, connecting the assembling pins in an interference fit manner, and connecting the bolts and the nuts to close and attach the two bevel gears and fixedly connect the bevel gears to form the herringbone gear with the combined structure.
Further perfecting the technical scheme, wherein in the step 1), the two bevel gear primary blanks are forging pieces or casting pieces or machining pieces or welding pieces; the two bevel gear primary blanks finish the processing of the wheel rim, the wheel spoke and the wheel hub, finish the processing of the through holes corresponding to the three bolts on the wheel spoke and the processing of the weight-reducing through holes, and finish the processing of the outer circle of the wheel rim and the processing of two end faces; the outer circle of the rim meets the requirement of dimensional tolerance, the two end surfaces of the rim meet the requirement of parallelism and flatness form and position tolerance, and the outer circle and the two end surfaces of the rim meet the requirement of perpendicularity form and position tolerance; the air-relief cushion plate in the step 2) is provided with a weight-reducing through hole corresponding to the two bevel gears, through holes corresponding to the three bolts and three assembly pin holes, and the diameters of the three assembly pin holes arranged on the air-relief cushion plate are slightly larger than those of the three assembly pin holes on the two bevel gears; the upper and lower surfaces of the degassing backing plate meet the requirements of parallelism and flatness form and position tolerance; the thickness of the degassing backing plate meets the gear hobbing process stroke requirement of the gear hobbing machine; in the step 3), the three bolts penetrate through the corresponding through holes and are connected with nuts to enable the two bevel gear primary blanks and the degassing backing plate between the two bevel gear primary blanks to be combined, attached and fixedly connected, and meanwhile coaxiality of the outer circles of the upper rims of the two bevel gear primary blanks is required to be guaranteed to meet the requirement of form and position tolerance; step 5) processing left-handed teeth and right-handed teeth by adopting the same group of differential exchange gears, and adding a intermediate gear to ensure equal spiral angles during reversing; after the gear teeth of one helical gear primary blank are rolled and cut, a plurality of symmetrical tooth shapes are drawn on the other helical gear primary blank through scribing, so that the cutter is aligned and the accurate position of the hob is finely adjusted when the gear teeth of the other helical gear primary blank are rolled and cut, and the symmetry of the tooth shapes is ensured; calculating and controlling the feeding amount through a hob feeding amount formula to ensure equal tooth thickness; and 8) processing the through holes and the key grooves on the hub by taking the outer circle of the rim as a reference, so as to ensure that the coaxiality of the through holes on the hub and the outer circle of the rim meets the requirement of form and position tolerance.
Preferably, in step 1), the two helical gear blanks are forging pieces or casting pieces or machining pieces or welding pieces; the two bevel gear primary blanks finish the processing of the wheel rim, the wheel spoke and the wheel hub, finish the processing of the through holes corresponding to the three bolts on the wheel spoke and the processing of the weight-reducing through holes, finish the processing of the through holes for connecting with the rotating shaft on the wheel hub, finish the processing of the outer circle of the wheel rim and the processing of the two end faces; the through holes on the hub and the outer circle of the rim meet the coaxiality form and position tolerance requirements and respectively meet the size tolerance requirements, the two end surfaces of the rim meet the parallelism and flatness form and position tolerance requirements, and the outer circle and the two end surfaces of the rim meet the perpendicularity form and position tolerance requirements; the air-relief cushion plate in the step 2) is provided with a weight-reducing through hole corresponding to the two bevel gears, a through hole for connecting with a rotating shaft, through holes corresponding to the three bolts and three assembling pin holes, wherein the diameters of the through holes for connecting with the rotating shaft and the three assembling pin holes arranged on the air-relief cushion plate are slightly larger than those of the through holes for connecting with the rotating shaft and the three assembling pin holes on the two bevel gears; the upper and lower surfaces of the degassing backing plate meet the requirements of parallelism and flatness form and position tolerance; the thickness of the degassing backing plate meets the gear hobbing process stroke requirement of the gear hobbing machine; in the step 3), the three bolts penetrate through the corresponding through holes and are connected with nuts to enable the two bevel gear primary blanks and the degassing backing plate between the two bevel gear primary blanks to be in close fit and fixedly connected, and the coaxiality of the through holes on hubs or the excircles of rims on the two bevel gear primary blanks is required to meet the requirement of form and position tolerance; step 5) processing left-handed teeth and right-handed teeth by adopting the same group of differential exchange gears, and adding a intermediate gear to ensure equal spiral angles during reversing; after the gear teeth of one helical gear primary blank are rolled and cut, a plurality of symmetrical tooth shapes are drawn on the other helical gear primary blank through scribing, so that the cutter is aligned and the accurate position of the hob is finely adjusted when the gear teeth of the other helical gear primary blank are rolled and cut, and the symmetry of the tooth shapes is ensured; calculating and controlling the feeding amount through a hob feeding amount formula to ensure equal tooth thickness; and 8) machining the key groove.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention fully utilizes the traditional gear hobbing machine and has low equipment cost.
2. The herringbone gear with the combined structure has no air escape groove, so that the thickness is reduced, and the weight is lightened; correspondingly, the thickness of the thickened gear teeth is provided with wider meshing tooth surfaces, so that the meshing transmission effect is better and the strength is higher.
3. The herringbone gear with the combined structure has high tooth alignment precision, can effectively ensure the key technical points of equal helix angle, symmetrical tooth shape and equal tooth thickness, and achieves the effects of good running and meshing effects and uniform stress of the left-handed teeth and the right-handed teeth.
4. The invention is formed by combining two independent gears, the requirement on the size of the material is correspondingly lower, the combined structure is detachable and convenient to maintain and clean, and meanwhile, the combined structure can be effectively positioned repeatedly and assembled again, so that the using effect is unchanged.
5. Besides the traditional gear hobbing machine, the gear hobbing machine also utilizes a series of materials in the gear manufacturing process, such as the original casting die, forging die, processing tool and the like, and the materials are not required to be put into again, so that the cost is greatly reduced, and the product series is expanded.
Drawings
FIG. 1 is a schematic diagram of a herringbone gear structure according to an embodiment of the present invention;
fig. 2-top view of fig. 1;
FIG. 3-section A-A of FIG. 2;
the novel double-sided clutch transmission comprises a 1-herringbone gear, a 2-joint surface, a 3-first bevel gear, a 4-second bevel gear, a 5-assembly pin, a 6-bolt, a 7-nut, an 11-rim, a 12-spoke, a 13-hub, a 14-weight-reduction fan-shaped through groove, a 15-through hole and a 16-key groove.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Referring to fig. 1 to 3, a herringbone gear 1 with a combined structure according to an embodiment of the present invention includes a first helical gear 3 and a second helical gear 4 symmetrically disposed along a joint surface 2, that is, the two helical gears respectively have left-handed teeth and right-handed teeth with equal helical angles, symmetrical tooth shapes, and equal tooth thicknesses; the three assembly pins 5 which are uniformly distributed on the circumference are in interference fit with the corresponding assembly pin holes on the spokes 12 of the two bevel gears along the axial direction so as to realize assembly positioning, and the three bolts 6 which are uniformly distributed on the circumference pass through the corresponding through holes on the spokes of the two bevel gears along the axial direction and are connected with the nuts 7 to close, fit and fixedly connect the two bevel gears; the bolts 6 are respectively arranged on extension lines of connecting lines between the assembly pins 5 and the circle centers of the herringbone gears 1; the thickness of the spokes 12 of the two bevel gears is smaller than that of the rim 11, the thickness of the hub 13 is equal to that of the rim 11, and three weight-reducing fan-shaped through grooves 14 are uniformly distributed on the spokes 12 of the two bevel gears along the circumference in an equal manner; after the spokes 12 of the two bevel gears are connected with the bolts 6 and the nuts 7, the two end surfaces of the bolts 6 do not exceed the two end surfaces of the herringbone gear 1; the hubs 13 of the two bevel gears are also provided with through holes 15 and key slots 16 for connecting with the rotating shaft.
The machining method of the herringbone gear 1 introducing the combined structure by using the machining part comprises the following specific steps:
1) Preparing two bevel gear primary blanks;
the processing method of the helical gear primary blank comprises the following specific steps:
1.1 A) lower round steel bar stock;
1.2 Turning one end surface of the rim 11, the spoke 12 and the hub 13, and forming a through hole 15 on the hub 13 for connecting with a rotating shaft on the outer circle of the rim 11; the through hole 15 on the hub 13 and the outer circle of the rim 11 meet the coaxiality form and position tolerance requirements and respectively meet the size tolerance requirements; the outer circle of the rim 11 and one end surface of the processed rim 11 and the hub 13 meet the requirement of perpendicularity form and position tolerance;
1.3 Turning over the other end surfaces of the rim 11, the spoke 12 and the hub 13;
1.4 The spoke 12 is provided with through holes corresponding to the three bolts 6 and the weight-reducing fan-shaped through groove 14;
1.5 Finish grinding the end surfaces of the rim 11 and the hub 13 turned in the step 1.3) with the end surfaces of the rim 11 and the hub 13 turned in the step 1.2) as references; the two end surfaces of the rim 11 and the hub 13 meet the requirements of parallelism and flatness form and position tolerance, and the ground surface and the outer circle of the rim 11 meet the requirements of perpendicularity form and position tolerance; thus, misoperation during combination can be avoided;
1.6 Grinding the other end surface to increase the roughness with reference to the surface ground in step 1.5); thus, the states of the two end surfaces are consistent, and misoperation during combination is further avoided;
2) Preparing a degassing base plate, wherein the degassing base plate is a round steel plate with the diameter smaller than the diameter of the root circle of the gear teeth of the two bevel gears;
the processing method of the air-relief cushion plate comprises the following specific steps of:
2.1 Blanking;
2.2 The diameter of the outer circle is smaller than the diameter of the root circle of the gear teeth of the two bevel gears;
2.3 Processing weight-reducing fan-shaped through grooves corresponding to the two bevel gears, through holes for connecting with the rotating shaft, through holes corresponding to the three bolts 6 and three assembly pin holes; the diameters of the through holes and the three assembling pin holes which are processed on the air-dissipating base plate and used for being connected with the rotating shaft are slightly larger than the diameters of the through holes 15 and the three assembling pin holes which are processed on the two bevel gears and used for being connected with the rotating shaft, namely the through holes;
2.4 Grinding the upper and lower surfaces; the upper surface and the lower surface meet the requirements of parallelism and flatness form and position tolerance, and the thickness meets the requirements of the gear hobbing process stroke of the gear hobbing machine;
3) The degassing backing plate is arranged between the two bevel gear primary blanks, the coaxiality of the through holes 15 on the hubs 13 or the excircle of the rim 11 on the two bevel gear primary blanks is guaranteed to meet the requirement of form and position tolerance by a special tool, and the three bolts 6 penetrate through the corresponding through holes and are connected with nuts 7 to close, attach and fixedly connect the two bevel gear primary blanks and the degassing backing plate between the two bevel gear primary blanks;
4) The three assembling pin holes are matched and processed, and the pins are assembled in the assembling pin holes in an interference fit connection process; marking corresponding assembly pin holes on two surfaces of the two bevel gear blanks facing the outer sides so as to fix the corresponding relation of the assembly pin holes and the corresponding relation of the end faces of the gears;
5) Machining gear teeth on a gear hobbing machine to form the two bevel gears; the same group of differential exchange gears are adopted for processing the left-handed teeth and the right-handed teeth, and a idler wheel is added during reversing to ensure that the spiral angles are equal; after the gear teeth of one helical gear primary blank are rolled and cut, a plurality of symmetrical tooth shapes are drawn on the other helical gear primary blank through scribing, so that the cutter is aligned and the accurate position of the hob is finely adjusted when the gear teeth of the other helical gear primary blank are rolled and cut, and the symmetry of the tooth shapes is ensured; calculating and controlling the feeding amount through a hob feeding amount formula to ensure equal tooth thickness;
6) Dismantling the process assembly pin and the three bolts 6, and dismantling the degassing backing plate;
7) The two bevel gears are reassembled according to the corresponding assembling pin holes and the gear end faces, the three assembling pins 5 are connected in an interference fit mode, and the three bolts 6 and the nuts 7 are connected to enable the two bevel gears to be combined and fixedly connected to form the herringbone gear 1 of the combined structure.
8) The key groove 16 is wire cut or cut.
When the method is implemented, the bevel gear can be a forging piece, a casting piece or a welding piece, and the machining process also comprises heat treatment after material blanking, high-frequency quenching after gear tooth machining and the like. Those skilled in the art will appreciate that the improvements and modifications to the process described above are intended to be within the scope of the present invention.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (6)
1. The machining method of the herringbone gear with the combined structure is characterized by comprising the following steps of: the herringbone gear with the combined structure processed by the method comprises two bevel gears with left-handed teeth and right-handed teeth respectively, at least two assembly pins are in interference fit with assembly pin holes correspondingly arranged on the two bevel gears along the axial direction so as to realize assembly positioning, and the two bevel gears are folded, attached and fixedly connected through a fastener;
the number of the assembly pins is three, and the assembly pins are uniformly distributed on spokes of the two bevel gears along the circumference in an equal distribution manner; the fasteners are three bolts which are axially arranged, the spokes of the two bevel gears are uniformly distributed along the circumference, and the bolts are respectively arranged on the extension lines of connecting lines of the assembly pins and the centers of the herringbone gears; the bolts penetrate through holes correspondingly formed in spokes of the two bevel gears and are connected with nuts so as to fold, fit and fixedly connect the two bevel gears;
the specific processing steps are as follows:
1) Preparing two bevel gear primary blanks;
2) Preparing a degassing base plate, wherein the degassing base plate is a round steel plate with the diameter smaller than the diameter of the root circle of the gear teeth of the two bevel gears;
3) The degassing backing plate is arranged between the two bevel gear primary blanks, and is gathered, attached and fixedly connected through the fastening piece;
4) The assembly pin hole is matched and processed, and a pin is assembled in the assembly pin hole in an interference fit connection process; marking corresponding assembly pin holes on two surfaces of the two bevel gear blanks facing the outer sides so as to fix the corresponding relation of the assembly pin holes and the corresponding relation of the end faces of the gears;
5) Machining gear teeth on a gear hobbing machine to form the two bevel gears;
6) Dismantling the process assembly pin and the fastener, and dismantling the degassing backing plate;
7) And reassembling the two bevel gears according to the corresponding assembling pin holes and the gear end faces, connecting the assembling pins in an interference fit manner, and connecting the bolts and the nuts to close and attach the two bevel gears and fixedly connect the bevel gears to form the herringbone gear with the combined structure.
2. The method for machining the herringbone gear with the combined structure according to claim 1, wherein the method comprises the following steps of: the thickness of the spokes of the two bevel gears is smaller than that of the rim; and a plurality of weight-reducing through holes are uniformly distributed on the spokes of the two bevel gears along the circumference in an equal distribution manner.
3. The method for machining the herringbone gear with the combined structure according to claim 2, wherein the method comprises the following steps of: the spiral angles of the left-handed teeth and the right-handed teeth of the two bevel gears are equal; the tooth shapes of the two bevel gears are symmetrical along the joint surface; the tooth thickness of the left-handed teeth and the right-handed teeth of the two bevel gears is equal.
4. A method of manufacturing a herringbone gear of a composite structure according to claim 3, wherein: the hubs of the two bevel gears are provided with through holes and key slots for connecting with the rotating shaft.
5. The method for machining the herringbone gear with the combined structure according to claim 4, wherein the method comprises the following steps of: the two bevel gear primary blanks in the step 1) are forging pieces or casting pieces or machining pieces or welding pieces; the two bevel gear primary blanks finish the processing of the wheel rim, the wheel spoke and the wheel hub, finish the processing of the through holes corresponding to the three bolts on the wheel spoke and the processing of the weight-reducing through holes, finish the processing of the through holes for connecting with the rotating shaft on the wheel hub, finish the processing of the outer circle of the wheel rim and the processing of the two end faces; the through holes on the hub and the outer circle of the rim meet the coaxiality form and position tolerance requirements and respectively meet the size tolerance requirements, the two end surfaces of the rim meet the parallelism and flatness form and position tolerance requirements, and the outer circle and the two end surfaces of the rim meet the perpendicularity form and position tolerance requirements; the air-relief cushion plate in the step 2) is provided with a weight-reducing through hole corresponding to the two bevel gears, a through hole for connecting with a rotating shaft, through holes corresponding to the three bolts and three assembling pin holes, wherein the diameters of the through holes for connecting with the rotating shaft and the three assembling pin holes arranged on the air-relief cushion plate are slightly larger than those of the through holes for connecting with the rotating shaft and the three assembling pin holes on the two bevel gears; the upper and lower surfaces of the degassing backing plate meet the requirements of parallelism and flatness form and position tolerance; the thickness of the degassing backing plate meets the gear hobbing process stroke requirement of the gear hobbing machine; in the step 3), the three bolts penetrate through the corresponding through holes and are connected with nuts to enable the two bevel gear primary blanks and the degassing backing plate between the two bevel gear primary blanks to be in close fit and fixedly connected, and the coaxiality of the through holes on hubs or the excircles of rims on the two bevel gear primary blanks is required to meet the requirement of form and position tolerance; step 5) processing left-handed teeth and right-handed teeth by adopting the same group of differential exchange gears, and adding a intermediate gear to ensure equal spiral angles during reversing; after the gear teeth of one helical gear primary blank are rolled and cut, a plurality of symmetrical tooth shapes are drawn on the other helical gear primary blank through scribing, so that the cutter is aligned and the accurate position of the hob is finely adjusted when the gear teeth of the other helical gear primary blank are rolled and cut, and the symmetry of the tooth shapes is ensured; calculating and controlling the feeding amount through a hob feeding amount formula to ensure equal tooth thickness; and 8) machining the key groove.
6. The method for machining the herringbone gear with the combined structure according to claim 4, wherein the method comprises the following steps of: the two bevel gear primary blanks in the step 1) are forging pieces or casting pieces or machining pieces or welding pieces; the two bevel gear primary blanks finish the processing of the wheel rim, the wheel spoke and the wheel hub, finish the processing of the through holes corresponding to the three bolts on the wheel spoke and the processing of the weight-reducing through holes, and finish the processing of the outer circle of the wheel rim and the processing of two end faces; the outer circle of the rim meets the requirement of dimensional tolerance, the two end surfaces of the rim meet the requirement of parallelism and flatness form and position tolerance, and the outer circle and the two end surfaces of the rim meet the requirement of perpendicularity form and position tolerance; the air-relief cushion plate in the step 2) is provided with a weight-reducing through hole corresponding to the two bevel gears, through holes corresponding to the three bolts and three assembly pin holes, and the diameters of the three assembly pin holes arranged on the air-relief cushion plate are slightly larger than those of the three assembly pin holes on the two bevel gears; the upper and lower surfaces of the degassing backing plate meet the requirements of parallelism and flatness form and position tolerance; the thickness of the degassing backing plate meets the gear hobbing process stroke requirement of the gear hobbing machine; in the step 3), the three bolts penetrate through the corresponding through holes and are connected with nuts to enable the two bevel gear primary blanks and the degassing backing plate between the two bevel gear primary blanks to be combined, attached and fixedly connected, and meanwhile coaxiality of the outer circles of the upper rims of the two bevel gear primary blanks is required to be guaranteed to meet the requirement of form and position tolerance; step 5) processing left-handed teeth and right-handed teeth by adopting the same group of differential exchange gears, and adding a intermediate gear to ensure equal spiral angles during reversing; after the gear teeth of one helical gear primary blank are rolled and cut, a plurality of symmetrical tooth shapes are drawn on the other helical gear primary blank through scribing, so that the cutter is aligned and the accurate position of the hob is finely adjusted when the gear teeth of the other helical gear primary blank are rolled and cut, and the symmetry of the tooth shapes is ensured; calculating and controlling the feeding amount through a hob feeding amount formula to ensure equal tooth thickness; and 8) processing the through holes and the key grooves on the hub by taking the outer circle of the rim as a reference, so as to ensure that the coaxiality of the through holes on the hub and the outer circle of the rim meets the requirement of form and position tolerance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN111022610B (en) * | 2019-11-22 | 2021-08-17 | 湖南南方宇航高精传动有限公司 | Process for combining left-handed inner gear ring and right-handed inner gear ring into high-precision herringbone gear |
| CN114208482A (en) * | 2021-12-10 | 2022-03-22 | 格力博(江苏)股份有限公司 | Grass cutter |
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