CN101954574A - Method for machining output shaft assembly - Google Patents

Abstract

The invention discloses a method for machining an output shaft assembly. The method comprises the following steps of: machining an output shaft; and assembling a gear shaft, an oil-retaining bearing and the output shaft. The process flow for machining the output shaft comprises blank preparation, blank fabrication, machining, non-traditional machining and auxiliary treatment, and is characterized in that the blank fabrication comprises blank prefabrication and blank fabrication by adopting cold extrusion forming technology. In the method, a blank is fabricated by adopting the cold extrusion forming technology; an involuting spiral spline is machined by adopting cold roll forming technology; machining is performed by adopting a computerized numerical control (CNC) lathe; punching and assembly are performed by adopting a special punching die and a riveting extrusion assembly die; and specific machining steps and method are adopted. Therefore, the fabricating precision and the machining efficiency of the output shaft assembly are improved; the comprehensive quality and the yield of products are improved; raw material and energy consumption is reduced; and environmental protection is reduced.

Description

A processing method of an output shaft assembly

technical field

The present invention relates to a processing method of an output shaft assembly, in particular to a processing method of an output shaft assembly of an automobile starter motor.

Background technique

At present, the most widely used starter motor in the automotive industry is the reduction transmission starter motor, and the planetary gear reduction transmission starter motor accounts for the largest proportion. Its application in cars reaches 70-80%, and its application in the entire automotive industry reaches More than 60%.

The output shaft assembly of the automobile starter motor is one of the most important parts of the planetary gear reduction transmission type starter motor. The quality and precision of its processing directly determine the assembly, transmission, vibration, noise, durability, and Starting and many other key performances.

Figure 1 shows a typical automotive starter motor output shaft assembly. The output shaft assembly of the automobile starter motor is assembled from an output shaft, a gear shaft and an oil-impregnated bearing. The processing process includes the processing of the output shaft and the assembly of the gear shaft, the output shaft and the output shaft. The processing steps of the output shaft include Billet preparation, billet making, mechanical processing and special processing, etc. The billet making includes using warm forging technology to make billets. This processing method not only consumes energy, pollutes the environment, but also has large processing allowance, low precision and low processing efficiency.

Contents of the invention

The purpose of the present invention is to provide a processing method of an output shaft assembly with high processing precision and high processing efficiency.

The purpose of the present invention is achieved in this way, a processing method of the output shaft assembly, including the processing of the output shaft and the assembly of the gear shaft, the oil bearing and the output shaft, the processing flow of the output shaft includes blank preparation, blank making . Mechanical processing, special processing and auxiliary treatment, characterized in that the billet making includes prefabricated billet and billet made by adopting cold extrusion forming technology.

In order to improve the processing efficiency and the overall quality of the helical spline, and solve the problem that the involute tooth-shaped parts without undercuts cannot be machined by hobbing, the above-mentioned special processing includes the processing of the involute helical spline, and the involute helical The splines are processed by cold rolling forming technology. Using the cold rolling forming technology, the processed helical spline has a high roughness of the tooth surface, which can reach above Ra0.4; because the metal fibers of the tooth shape are complete and continuous, unlike the metal fibers of the mechanically processed tooth shape Cutting off, and the metal particles on the surface of the tooth profile become smaller and more refined, so the cold rolled tooth profile has higher fatigue resistance and bending strength, and the overall strength can be increased by 15-20%; the roll forming die has a long life and can In addition, the use of cold rolling technology can save a lot of machine tools, plant area and production operators, and is convenient for production management and easy to realize the automation of the production process; therefore, the application of cold rolling forming technology can be large Significantly reduce manufacturing costs.

The above-mentioned special processing also includes punching. In order to improve the punching pass rate of the bottom hole of the gear shaft, the punching is to punch out three bottom holes of the gear shaft on the output shaft using the punching die disclosed in the patent application number 201020055240.9. When punching, the above-mentioned oil-impregnated bearing seat hole is used as a positioning reference, the size error of the three gear shaft bottom holes is ≤0.02, and the position error relative to the two reference small end center holes and the oil-impregnated bearing seat hole is ≤0.03. Compared with ordinary punching technology, the qualified rate of products is increased by 15-20%, and the life of punching dies reaches more than 30,000 pieces.

In order to maintain the consistency of the benchmarks and further improve the processing quality of the output shaft, the above-mentioned machining processes all use the central hole at the small end and the 60° taper hole at the big end as positioning benchmarks.

In order to improve machining accuracy, the above-mentioned mechanical processing includes rough turning, semi-finishing turning and finishing turning, and the rough turning, semi-finishing turning and finishing turning all adopt numerical control lathes.

In order to improve the assembly qualification rate of the output shaft assembly and reduce the production cost, the assembly of the above-mentioned gear shaft, the oil-impregnated bearing and the above-mentioned output shaft is to use the riveting assembly die disclosed in the patent application number 201020055282. The shaft is riveted and assembled to the output shaft, and the position error of the three gear shafts relative to the center holes of the two reference small ends and the inner hole of the oil-impregnated bearing is ≤0.04. The pass rate of the product is increased by more than 20%, the manufacturing cost is reduced by 15-20%, and the life of the riveting assembly die reaches 30,000-50,000 pieces.

In order to improve the overall quality, yield and processing efficiency of the product, the output shaft of the present invention adopts the following processing steps:

The above blank preparation specifically includes

(1) Cutting: hot-rolled bars are cut by cutting or sawing; 

(2) Shot blasting: remove the oxide skin on the surface of the material;

(3) Car billet: the collapse and chamfering formed at both ends of the material when the car is removed for blanking, which improves the process stability of the cold extrusion preform;

(4) Surface treatment: Through surface phosphating and saponification treatment, a layer of phosphating and saponification film is uniformly covered on the billet surface, thereby reducing frictional resistance and forming resistance during cold extrusion of preforms, and improving process stability.

The above blanks specifically include

(1) Prefabricated billet: Prefabricated billet using cold extrusion forming technology to prepare for the final billet formed in the next step;  

(2) Surface treatment: Through surface phosphating and saponification treatment, a layer of phosphating and saponification film is evenly covered on the surface of the preform, thereby reducing friction resistance and forming resistance during cold extrusion forming, and improving process stability;

(3) Pre-upsetting billet: use cold extrusion forming technology to pre-upset the billet, and make further preparations for the next step of forming the final billet;  

(4) Annealing: through annealing treatment, the hardness increase and stress removal of the preform and pre-heading blank due to work hardening are reduced, so that the cold extrusion forming force is greatly reduced, the tonnage of the equipment is reduced, and the subsequent cold extrusion is improved. Process stability of press forming;

(5) Shot blasting: remove the scale on the surface of the previously annealed blank;

(6) Surface treatment: Through surface phosphating and saponification treatment, a layer of phosphating and saponification film is uniformly covered on the surface of pre-heading blanks, thereby reducing friction resistance and forming resistance during cold extrusion forming, and improving process stability;

(7) Cold extrusion: adopt cold extrusion forming technology to form the final blank that is very close to the output shaft, improve the utilization rate of metal materials, reduce the metal allowance for subsequent machining to a lower level, and improve processing efficiency ;

(8) Normalizing: The purpose of normalizing is to reduce the high hardness of the cold extrusion forming blank due to work hardening, remove the stress caused by work hardening, and improve the stability of the subsequent machining process;

(9) Straightening; if there is excessive bending of the normalizing blank, it needs to be corrected by the straightening process to prepare for the subsequent machining process;

The above-mentioned mechanical processing includes rough turning, semi-finishing turning and finishing turning. The rough turning, semi-finishing turning and finishing turning all adopt CNC lathes and are all centered on the small end center hole (1) and the big end 60° tapered hole (12). As a positioning reference, the above-mentioned mechanical processing and special processing specifically include

(1) Turning the large end face: remove the excess metal material at both ends of the large end face and the outer circle of the large end to prepare for the subsequent machining process; 

(2) Turning small end face: processing to remove excess material on the small end face to prepare for the subsequent machining process;

(3) Machining the center hole of the big end: machining the center hole of the big end, as the transition benchmark of the subsequent machining process, will eventually be removed by machining;

(4) Machining the center hole of the small end: machining the center hole of the small end as one of the benchmarks for the subsequent machining process;

(5) Rough turning datum surface: the clamping datum of the subsequent machining process of rough machining to remove excess material;

(6) Finishing datum plane: the clamping datum for the subsequent machining process;

(7) Turning the large end face and oil bearing seat hole: process both ends of the large end face and the outer circle, remove excess material, process the oil bearing seat hole and 60° tapered hole, and use it as a follow-up machining, cold rolling involute spiral Multiple positioning datums for processes such as splines, stamping gear shaft bottom holes, and riveting assembly;

(8) Rough turning outer circle: rough machining of each outer circle and involute helical spline (6) The outer circle before rolling to remove excess material;

(9) Semi-finishing outer circle: further processing each outer circle, removing excess material, processing the shape and size of the blank of the involute spiral spline rolling forming section, including chamfering, bevel and involute spiral spline rolling The outer diameter of the front, as well as the ring groove and the relief groove;

(10) Cold rolling: apply cold rolling forming technology to process and manufacture involute spiral splines, which solves the problem that tooth-shaped parts without undercut grooves cannot be machined, reduces machining processes, and greatly improves processing efficiency by more than 20 times ;

(11) Finishing outer circle: finishing each outer circle and involute spiral spline tooth tip circle, removing excess material, leaving only the grinding allowance after heat treatment;

(12) Punching: use the punching die disclosed in the patent application number 201020055240.9 to punch out three gear shaft bottom holes on the output shaft. The size error of the bottom hole is ≤0.02, and the position error relative to the center hole of the two datum small ends and the oil bearing seat hole is ≤0.03;

(13) Finish turning both sides of the big end: process both sides of the big end face and the outer circle of the big end, remove excess material and punching slump, and ensure the disc thickness and shape tolerance requirements;

(14) The overall length of the vehicle: processing and removing the excess material on the small end face to ensure the overall length;

(15) Process the oil-impregnated bearing seat hole: process the oil-impregnated bearing seat hole to ensure the hole depth;

(16) Orifice chamfering: the orifice is chamfered to remove burrs, so as to facilitate the riveting assembly of the gear shaft and ensure the quality of the assembly assembly;

(17) Marking: mark the required marking machine;

(18) Carburizing and quenching: through carburizing and quenching treatment, the hardness of the output shaft center and surface can be improved, the structure can be improved, and the effective carburized layer depth on the surface can meet the requirements;

(19) Grinding reference hole: Grinding is used to improve the surface roughness of the reference hole and remove debris such as sand and stones in the hole;

(20) Grinding the outer circle: Grinding to make the size, surface roughness, and shape tolerance of each outer circle meet the requirements;

The above-mentioned auxiliary treatment includes cleaning, decontamination and anti-rust treatment of the ground product.

The present invention has the following beneficial effects: the present invention adopts cold extrusion forming technology to make blank, adopts cold rolling forming technology to process involute spiral spline, adopts numerical control lathe for machining, and adopts special punching die and riveting assembly die Punching and assembly, and the use of unique processing steps and methods, not only improve the manufacturing accuracy and processing efficiency of the output shaft assembly, improve the overall quality and yield of products, but also reduce raw materials and energy consumption, and reduce environmental pollution.

the

Description of drawings

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

FIG. 2 is a side view of FIG. 1 .

Detailed ways

Embodiment 1, a processing method of the output shaft assembly, including the processing of the output shaft 19 and the assembly of the gear shaft 17, the oil bearing 18 and the output shaft 19, the processing flow of the output shaft 19 includes blank preparation, blank making, machining, Special processing and auxiliary processing;

Billet making includes preform and billet making by cold extrusion forming technology;

Special processing includes the processing of involute helical spline 6, and the processing of involute helical spline 6 adopts cold rolling forming technology;

The special processing also includes punching. The punching is to use the punching die disclosed in the patent application number 201020055240.9 to punch out three bottom holes of the gear shaft on the output shaft. The size error of the bottom holes of the three gear shafts is ≤0.02, and the position error of the center hole of the small end and the hole containing the bearing seat is ≤0.03;

The machining process is based on the central hole 1 at the small end and the 60° taper hole 12 at the large end as the positioning reference;

Mechanical processing includes rough turning, semi-finishing turning and finishing turning, and the rough turning, semi-finishing turning and finishing turning all adopt numerical control lathe;

Auxiliary treatment includes cleaning, decontamination and anti-rust treatment for ground products;

The gear shaft 17, the oil bearing 18 and the output shaft 19 are assembled by riveting the oil bearing 18 and three gear shafts 17 onto the output shaft 19 once on the hydraulic machine using the riveting assembly die disclosed by the patent application number 201020055282.2, three The position error of the gear shaft 17 relative to the two center holes at the small end and the inner hole of the oil-impregnated bearing is ≤0.04.

Embodiment 2, a processing method of the output shaft assembly, including the processing of the output shaft 19 and the assembly of the gear shaft 17, the oil bearing 18 and the output shaft 19, the processing flow of the output shaft 19 includes blank preparation, blank making, machining and Special processing and auxiliary processing;

The specific operation steps of the machining of the output shaft 19 are as follows:

Billet preparation includes

(1) Cutting: hot-rolled bars are cut by cutting or sawing; 

(2) Shot blasting: remove the oxide skin on the surface of the material;

(3) Car billet: the collapse and chamfering formed at both ends of the material when the car is removed for blanking, which improves the process stability of the cold extrusion preform;

(4) Surface treatment: Through surface phosphating and saponification treatment, a layer of phosphating and saponification film is evenly covered on the surface of the billet;

Billets include

(1) Prefabricated billets: prefabricated billets using cold extrusion forming technology;

(2) Surface treatment: Through surface phosphating and saponification treatment, a layer of phosphating and saponification film is evenly covered on the surface of the prefabricated blank;

(3) Pre-upset billet: adopt cold extrusion forming technology to pre-upset billet; 

(4) Annealing;

(5) Shot blasting: remove the scale on the surface of the previously annealed blank;

(6) Surface treatment: Through surface phosphating and saponification treatment, a layer of phosphating and saponification film is evenly covered on the surface of the pre-heading blank;

(7) Cold extrusion: using cold extrusion forming technology to form a final blank that is very close to the output shaft 19;

(8) normalizing;

(9) straightening;

Machining includes rough turning, semi-finishing turning and finishing turning, and described rough turning, semi-finishing turning and finishing turning all adopt numerical control lathe and all take the small end central hole 1 and the big end 60° taper hole 12 as positioning datum, mechanical Processing and special processing specifically include

(1) Turning the large end face: remove the excess metal material at both ends 13 and 15 of the large end face and the outer circle 14 of the large end; 

(2) Car small end face: process to remove excess material of small end face 16;

(3) Machining the center hole of the big end: machining the center hole of the big end, as the transition benchmark of the subsequent machining process, will eventually be removed by machining;

(4) Machining the center hole of the small end: machining the center hole 1 of the small end as one of the benchmarks of the subsequent machining process;

(5) Rough turning datum surface: the clamping datum of the subsequent machining process of rough machining to remove excess material;

(6) Finishing datum plane: the clamping datum for the subsequent machining process;

(7) Turn the big end face and oil bearing seat hole: process the two ends of the big end face 13, 15 and the outer circle 14, remove excess material, process the oil bearing seat hole 8 and the big end 60° taper hole 12, as follow-up machining , cold rolling involute helical spline 6, stamping gear shaft bottom hole, and multiple positioning references for riveting and extrusion assembly processes;

(8) Rough turning outer circle: rough machining each outer circle 2, 4, 9 and the outer circle of the involute helical spline 6 before rolling, and remove excess material;

(9) Semi-finished outer circle: further process each outer circle 2, 4, 9, remove excess material, process the shape and size of the blank of the involute helical spline 6 rolling forming section, including chamfer 5, bevel 7 and The diameter of the outer circle of the involute helical spline 6 before rolling, as well as the circlip groove 3 and the relief groove 10;

(10) Cold rolling: apply cold rolling forming technology to process and manufacture involute helical spline 6;

(11) Finishing outer circle: finish machining each outer circle 2, 4, 9 and involute spiral spline 6 tooth tip circle, remove excess material, and only leave the grinding allowance after heat treatment;

(12) Punching: Use the punching die disclosed in the patent application number 201020055240.9 to punch out three gear shaft bottom holes 11 on the output shaft 19; when punching, use the oil bearing seat hole as the positioning reference, and the three gear shafts The size error of the bottom hole is ≤0.02, and the position error relative to the center hole of the small end and the hole containing the bearing seat is ≤0.03;

(13) Finish turning both sides of the big end: process the two sides 13, 15 of the big end and the outer circle 14 of the big end, remove excess material and punching slump, and ensure the disc thickness and shape tolerance requirements;

(14) The overall length of the car: machining and removing the excess material on the small end face 16 to ensure the overall length;

(15) Process the oil-impregnated bearing seat hole: process oil-impregnated bearing seat hole 8 to ensure the hole depth;

(16) Orifice chamfering: the orifice is chamfered to remove burrs, so as to facilitate the riveting assembly of the gear shaft 17 and ensure the assembly quality of the assembly;

(17) Marking: mark the required marking machine;

(18) Carburizing and quenching;

(19) Grinding reference hole: Grinding is used to improve the surface roughness of the reference hole and remove debris such as sand and stones in the hole;

(20) Grinding the outer circle: Grinding to make the size, surface roughness, and shape and position tolerance of each outer circle 2, 4, and 9 meet the requirements;

Auxiliary treatment includes cleaning, decontamination and anti-rust treatment for ground products;

The gear shaft 17, the oil bearing 18 and the output shaft 19 are assembled by riveting the oil bearing 18 and three gear shafts 17 onto the output shaft 19 once on the hydraulic machine using the riveting assembly die disclosed by the patent application number 201020055282.2, three The position error of the gear shaft 17 relative to the two center holes at the small end and the inner hole of the oil-impregnated bearing is ≤0.04.

Claims (10)

1. the processing method of an output shaft assembly, comprise the processing of output shaft (19) and the assembling of gear shaft (17), oiliness bearing (18) and described output shaft (19), the work flow of described output shaft (19) comprises blank preparation, base, machining, the special process and aid in treatment, it is characterized in that described base comprises employing cold-extrusion shaping technology prefabricated blank and base.

2. the processing method of output shaft assembly as claimed in claim 1 is characterized in that: the described special process comprises the processing of involute helical spline (6), and being processed as of described involute helical spline (6) adopts cold rolling shaping technology to process.

3. the processing method of output shaft assembly as claimed in claim 2, it is characterized in that: the described special process also comprises punching, described punching stamps out three gear shaft bottom outlets (11) for using punching die on described output shaft (19), during punching with described oiliness bearing seat hole (8) as the location benchmark, scale error≤0.02 of described three gear shaft bottom outlets (11), and with respect to as the small end centre bore (1) of benchmark and site error≤0.03 in described oiliness bearing seat hole (8).

4. the processing method of output shaft assembly as claimed in claim 3 is characterized in that: described punching die is that application number is the punching die of 201020055240.9 patent disclosure.

5. the processing method of output shaft assembly as claimed in claim 4 is characterized in that: the technical process of described machining all is with small end centre bore (1) and holds 60 ° of taper holes (12) as the location benchmark greatly.

6. the processing method of output shaft assembly as claimed in claim 5 is characterized in that: described machining comprises rough turn, half finish turning and finish turning, and described rough turn, half finish turning and finish turning all adopt numerically controlled lathe.

7. the processing method of output shaft assembly as claimed in claim 6, it is characterized in that: described gear shaft (17), oiliness bearing (18) and being assembled into of described output shaft (19) use riveting squeeze the assembling mould on the hydraulic machine once with oiliness bearing (18) with three rooted tooth wheel shaft (17) rivetings are crowded is assembled on the described output shaft (19), described three rooted tooth wheel shafts (17) are with respect to as the small end centre bore (1) of benchmark and site error≤0.04 of oiliness bearing endoporus.

8. the processing method of output shaft assembly as claimed in claim 7 is characterized in that: it is that application number is the mould of 201020055282.2 patent disclosure that the assembling mould is squeezed in described riveting.

9. the processing method of output shaft assembly as claimed in claim 1 is characterized in that: the procedure of processing of described output shaft is specific as follows:

Described blank is prepared to comprise

(1) blanking: the hot rolling bar adopts the process blanking of shearing or sawing;

(2) ball blast: the oxide skin of removing the material surface that descends;

(3) car base: formed angle and the chamfering of collapsing in material two ends when car goes blanking, the technology stability when improving the cold extrusion prefabricated blank;

(4) surface treatment: handle by the alramenting saponification, evenly cover one deck phosphatization saponification film in blank surface;

Described base comprises:

(1) prefabricated blank: adopt cold-extrusion shaping technology prefabricated blank;

(2) surface treatment: handle by the alramenting saponification, evenly cover one deck phosphatization saponification film on prefabricated blank surface;

(3) base of upsetting in advance: adopt the cold-extrusion shaping technology to come pre-rammer base;

(4) annealing;

(5) ball blast: the oxide skin on the blank surface of annealing before removing;

(6) surface treatment: handle by the alramenting saponification, evenly cover one deck phosphatization saponification film on pre-rammer blank surface;

(7) cold extrusion: adopt the cold-extrusion shaping technology, be shaped and final blank that output shaft (19) is very approaching;

(8) normalizing;

(9) alignment;

That described machining comprises is rough turn, half finish turning and finish turning, described rough turn, half finish turning and finish turning all adopts numerically controlled lathe and all be with small end centre bore (1) and big 60 ° of taper holes of end (12) as locating benchmark, the described machining and the special process comprise:

(1) car large end face: the excess metal material of removing large end face two ends (13,15) and holding cylindrical (14) greatly;

(2) car small end face: the excess stock of small end face (16) is removed in processing;

(3) the big end of processing centre bore: the big end of processing centre bore, as the transition baseline of follow-up machining operation, finally can processedly remove;

(4) processing small end centre bore: processing small end centre bore (1), as one of benchmark of follow-up machining operation;

(5) rough turn datum level: the clamping benchmark of the follow-up machining operation of roughing, remove excess stock;

(6) finish turning datum level: the clamping benchmark that processes follow-up machining operation;

(7) car large end face and oiliness bearing seat hole: processing large end face two ends (13,15), cylindrical (14), remove excess stock, processing oiliness bearing seat hole (8) and big end 60 ° of taper holes (12) squeeze the location benchmark of operations such as assembling with this as follow-up machining, cold rolling involute helical spline (6), three gear shaft bottom outlets of punching press (11) and riveting;

(8) rough turn cylindrical: the cylindrical before each cylindrical of roughing (2,4,9) and involute helical spline (6) rolling, remove excess stock;

(9) half finish turning cylindricals: further process each cylindrical (2,4,9), remove excess stock, processing involute helical spline (6) rollforming section blank shape and size, comprise the outside diameter that chamfering (5), oblique angle (7) and involute helical spline (6) rolling are preceding, and jump ring groove (3) and escape (10);

(10) cold rolling: use cold rolling shaping technology processing and manufacturing involute helical spline (6);

(11) finish turning cylindrical: each cylindrical of fine finishining (2,4,9) and involute helical spline (6) outside circle, remove excess stock, only stay the grinding allowance after the heat treatment;

(12) punching: request for utilization number is that the punching die of 201020055240.9 patent disclosure stamps out three gear shaft bottom outlets (11) on output shaft (19); During punching with described oiliness bearing seat hole (8) as the location benchmark, scale error≤0.02 of described three gear shaft bottom outlets (11), and with respect to as the small end centre bore (1) of benchmark and site error≤0.03 in described oiliness bearing seat hole (8);

(13) the big end of finish turning two sides: processing large end face both sides (13,15) and hold cylindrical (14) greatly, remove excess stock and the punching angle of collapsing, thick size and Geometrical Tolerance Principle are coiled in assurance;

(14) car length overall: the excess stock of small end face (16) is removed in processing, guarantees the length overall size;

(15) processing oiliness bearing seat hole: processing oiliness bearing seat hole (8) guarantees depth size;

(16) aperture chamfering: the aperture chamfering is removed burr, is beneficial to gear shaft (17) riveting and squeezes assembling, guarantees the quality of assembly assembling;

(17) marking: the mark machine of stamping requirement;

(18) carburizing and quenching;

(19) grind datum hole: grind in order to improve the datum hole surface roughness, foreign material such as the interior sandstone of cleaning hole;

(20) cylindrical grinding: grinding cylindrical (2,4,9) makes its size, surface roughness and form and position tolerance all reach requirement;

Described aid in treatment is for cleaning scrubbing and antirust processing to abrasive product.

10. the processing method of output shaft assembly as claimed in claim 9, it is characterized in that: described gear shaft (17), oiliness bearing (18) and described output shaft (19) be assembled into request for utilization number be the riveting of 201020055282.2 patent disclosure squeeze the assembling mould on the hydraulic machine once with oiliness bearing (18) with three rooted tooth wheel shaft (17) rivetings are crowded is assembled on the described output shaft (19), described three rooted tooth wheel shafts (17) are with respect to as the small end centre bore (1) of benchmark and site error≤0.04 of oiliness bearing endoporus.

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