CN110608227B - Crawler vehicle transmission system transmission main shaft capable of improving fatigue strength life - Google Patents

Crawler vehicle transmission system transmission main shaft capable of improving fatigue strength life Download PDF

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CN110608227B
CN110608227B CN201911002835.XA CN201911002835A CN110608227B CN 110608227 B CN110608227 B CN 110608227B CN 201911002835 A CN201911002835 A CN 201911002835A CN 110608227 B CN110608227 B CN 110608227B
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main shaft
involute spline
transmission main
output
transmission
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CN110608227A (en
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王成
邹天刚
桂林
程燕
李洪武
许晋
郭静
侯威
桂鹏
孙雪岩
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China North Vehicle Research Institute
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/22—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
    • F16D3/06—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Ocean & Marine Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention belongs to the technical field of anti-fatigue design of transmission shafts, and particularly relates to a transmission main shaft of a transmission system of a tracked vehicle, which can prolong the fatigue strength and prolong the service life. The tool withdrawal groove structure is eliminated between the left output involute spline and the left cylindrical surface and between the right output involute spline and the right cylindrical surface. By adopting the technical scheme, the design of the transmission main shaft of the transmission system of the tracked vehicle is more scientific, the outside diameter and the transition fillet of the transition area are reasonably given by canceling the tool withdrawal groove structure of the involute spline of the transmission main shaft, the maximum working stress of the transmission main shaft is effectively reduced, and the problem of overlarge local stress caused by the tool withdrawal groove structure is solved; in addition, by increasing the inner hole of the transmission main shaft, the weight of the transmission main shaft can be reduced on the premise of not improving the maximum working stress of the transmission main shaft basically, and the lightweight design is realized. The method can greatly prolong the fatigue life of the transmission main shaft of the crawler transmission system and improve the reliability and power density of the transmission main shaft.

Description

Crawler vehicle transmission system transmission main shaft capable of improving fatigue strength life
Technical Field
The invention belongs to the technical field of anti-fatigue design of transmission shafts, and particularly relates to a transmission main shaft of a transmission system of a tracked vehicle, which can prolong the fatigue strength and prolong the service life.
Background
The transmission shaft is a key basic part for power transmission of the tracked vehicle, and the use performance of the transmission shaft plays a crucial role in realizing the functions and reliability of the whole transmission system. Due to the strict limitation of the tracked vehicle on the volume and the weight of the transmission system, the transmission shaft can only be designed and manufactured in a fine mode, the volume and the weight are reduced, and meanwhile the service life is guaranteed. The transmission shafts in the transmission system of the tracked vehicle are various in types, such as a transmission main shaft, a steering zero shaft, an auxiliary transmission shaft, a fan transmission shaft and the like, wherein the functions, the supporting forms, the structural types and the like of the transmission main shaft are the most complicated. The power of the transmission main shaft is input from the middle and then output from the two ends, the transmission main shaft has the characteristics of single input and double output, and the transmission main shaft is connected with the input part and the output part through involute splines. In addition, due to the overall layout constraint and limitation of the transmission system, the output ends of the transmission main shaft at the two sides of the input involute spline are in an asymmetric structure.
In the running process of the tracked vehicle, under the combined action of complex internal and external excitation, the transmission main shaft bears the alternating load effect, and because of accumulation of fatigue damage, the transmission main shaft frequently generates early fatigue failure, so that the whole transmission system is paralyzed, and the whole vehicle loses the functions of straight running, steering, braking and the like. At present, a tool withdrawal groove structure is generally adopted in a transition area of an involute spline at the output end of two sides of a transmission main shaft, and from the fracture rule of the transmission main shaft, fracture positions are all generated at the tool withdrawal groove part of the involute spline, so that the problem that local stress is overlarge due to unreasonable structural design of the transmission main shaft is solved. Therefore, in the design stage, the structure improvement design needs to be carried out on the tool withdrawal groove part of the involute spline of the transmission main shaft, so that the working stress is reduced, the anti-fatigue capability of the transmission main shaft is improved, and the reliability of the transmission main shaft is improved.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to design a transmission main shaft of a transmission system of a tracked vehicle to solve the problem that the existing transmission main shaft has early fatigue failure due to overlarge local stress caused by an involute spline tool withdrawal groove structure, thereby improving the fatigue resistance design capability of the transmission main shaft.
(II) technical scheme
In order to solve the technical problem, the invention provides a transmission main shaft of a transmission system of a tracked vehicle, which can improve the fatigue strength and prolong the service life, wherein an inner hole 10 is formed in the transmission main shaft, and the transmission main shaft comprises from left to right: a left bearing supporting and positioning cylindrical surface 1, a left output involute spline 2, a left transition area 3, a left cylindrical surface 4, a middle input involute spline 5, a right cylindrical surface 6, a right transition area 7, a right output involute spline 8 and a right bearing supporting and positioning cylindrical surface 9;
and a tool withdrawal groove structure is eliminated between the left output involute spline 2 and the left cylindrical surface 4 and between the right output involute spline 8 and the right cylindrical surface 6.
Wherein the outer diameters of the left transition area 3 and the right transition area 7 are both defined as do，doIs an integer and satisfies the following formula:
(ds-2)≤do≤(ds-1) (1)
in the above formula, dsThe unit is mm, and the unit is the small diameter of the left side output involute spline 2 and the right side output involute spline 8.
Wherein the lengths of the left transition area 3 and the right transition area 7 are both defined as lg，lgIs an integer and satisfies the following formula:
Figure BDA0002241866430000021
in the above formula, θ is as follows:
Figure BDA0002241866430000022
in the above formula, R represents the radius of the involute spline grinding wheel in mm.
Wherein the value of R is 60 mm.
Wherein, the radius of the transition fillet of the left transition area 3 and the right transition area 7 is defined as r, and r is an integer and satisfies the following formula;
Figure BDA0002241866430000031
in the above formula, DsThe unit of the large diameter of the left output involute spline 2 and the right output involute spline 8 is mm.
Wherein the diameter d of the inner bore 10iSatisfies the following formula:
Figure BDA0002241866430000032
the left output involute spline 2, the middle input involute spline 5 and the right output involute spline 8 of the transmission main shaft all adopt 30-degree circular tooth roots, and therefore working stress of the tooth roots of the involute splines is reduced.
Wherein, shot peening strengthening process is adopted at the left transition region 3 and the right transition region 7 to generate residual compressive stress on the surface.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the transmission main shaft of the crawler transmission system, which can prolong the fatigue strength life, the involute spline tool withdrawal groove structure of the transmission main shaft is cancelled, the outer diameter and the transition fillet of the transition area are reasonably given, and the local stress concentration caused by the tool withdrawal groove structure is effectively reduced;
(2) according to the crawler transmission system transmission main shaft capable of prolonging the fatigue strength service life, the weight of the transmission main shaft can be reduced and the lightweight design can be realized on the premise of basically not increasing the maximum working stress of the transmission main shaft by increasing the inner hole of the transmission main shaft.
(3) The invention makes the design of the transmission main shaft of the transmission system of the tracked vehicle more scientific, and if the maximum working stress occurs in the transition region of the transmission main shaft, shot peening strengthening technology can be adopted to generate residual compressive stress on the surface of the transition region, thereby further improving the fatigue strength of the transmission main shaft.
Drawings
Fig. 1 is a structural view of a transmission spindle of the present invention.
Fig. 2 is a partial structure diagram of the right transition region of the transmission main shaft of the invention.
Fig. 3 is a structural view of a transmission spindle designed by a conventional method.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the problems in the prior art, the invention provides a transmission main shaft of a transmission system of a tracked vehicle, which can improve the fatigue strength and prolong the service life, as shown in fig. 1 and 2, an inner hole 10 is formed in the transmission main shaft, and the transmission main shaft comprises from left to right: a left bearing supporting and positioning cylindrical surface 1, a left output involute spline 2, a left transition area 3, a left cylindrical surface 4, a middle input involute spline 5, a right cylindrical surface 6, a right transition area 7, a right output involute spline 8 and a right bearing supporting and positioning cylindrical surface 9;
and a tool withdrawal groove structure is eliminated between the left output involute spline 2 and the left cylindrical surface 4 and between the right output involute spline 8 and the right cylindrical surface 6.
Wherein the outer diameters of the left transition area 3 and the right transition area 7 are both defined as do，doIs an integer and satisfies the following formula:
(ds-2)≤do≤(ds-1) (1)
in the above formula, dsThe unit is mm, and the unit is the small diameter of the left side output involute spline 2 and the right side output involute spline 8.
Wherein the lengths of the left transition area 3 and the right transition area 7 are both defined as lg，lgIs an integer and satisfies the following formula:
Figure BDA0002241866430000041
in the above formula, θ is as follows:
Figure BDA0002241866430000051
in the above formula, R represents the radius of the involute spline grinding wheel in mm.
Wherein the value of R is 60 mm.
Wherein, the radius of the transition fillet of the left transition area 3 and the right transition area 7 is defined as r, and r is an integer and satisfies the following formula;
Figure BDA0002241866430000052
in the above formula, DsThe unit of the large diameter of the left output involute spline 2 and the right output involute spline 8 is mm.
Wherein the diameter d of the inner bore 10iSatisfies the following formula:
Figure BDA0002241866430000053
the left output involute spline 2, the middle input involute spline 5 and the right output involute spline 8 of the transmission main shaft all adopt 30-degree circular tooth roots, and therefore working stress of the tooth roots of the involute splines is reduced.
Wherein, shot peening strengthening process is adopted at the left transition region 3 and the right transition region 7 to generate residual compressive stress on the surface.
Therefore, if the local stress of the transmission main shaft is maximum in the left transition region 3 and the right transition region 7, the fatigue strength of the transmission main shaft is further improved by applying shot peening process to generate residual compressive stress on the surface.
Through comparative analysis of the transmission main shafts of the invention and the traditional design, as shown in fig. 1 and fig. 3, respectively, under the condition that the load and the constraint boundary are the same, the maximum working stress and the weight calculation results of the two transmission main shafts are shown in table 1. Compared with the traditional method, the maximum working stress of the transmission main shaft designed by the method is obviously reduced, and the local stress concentration caused by the tool withdrawal groove structure is reduced. In addition, the weight of the transmission main shaft is also obviously reduced, the lightweight design is realized, and the power density is improved.
TABLE 1 comparison of the calculated results
Conventional methods The method of the invention Reduction ratio (%)
Maximum working stress (MPa) 846.1 698.6 17.4％
Weight (kg) 21.95 19.04 13.3％
The fatigue resistant design of the drive spindle of a tracked vehicle drive system determines the reliability of the overall drive system. The invention has the following effects: the invention changes the traditional design scheme of the transmission main shaft, the structural parameters of the transmission main shaft need to satisfy the formulas (1), (2), (3), (4) and (5), the method can effectively reduce the local stress concentration caused by the tool withdrawal groove structure, and simultaneously reduce the quality of the transmission main shaft, so that the design of the transmission main shaft of the transmission system of the tracked vehicle is more scientific.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A tracked vehicle transmission system transmission main shaft capable of improving fatigue strength life is characterized in that an inner hole (10) is formed in the transmission main shaft, and the transmission main shaft comprises from left to right: the bearing support positioning device comprises a left bearing support positioning cylindrical surface (1), a left output involute spline (2), a left transition area (3), a left cylindrical surface (4), a middle input involute spline (5), a right cylindrical surface (6), a right transition area (7), a right output involute spline (8) and a right bearing support positioning cylindrical surface (9);
a left transition area (3) and a right transition area (7) are respectively arranged between the left output involute spline (2) and the left cylindrical surface (4) and between the right output involute spline (8) and the right cylindrical surface (6);
the outer diameters of the left transition area (3) and the right transition area (7) are equal and are both defined as do，doIs an integer and satisfies the following formula:
(ds-2)≤do≤(ds-1) (1)
in the above formula, the small diameters of the left output involute spline (2) and the right output involute spline (8) are equal and are both defined as dsIn mm.
The left transition area (3) and the right transition area (7) are equal in length and are both defined as lg，lgIs an integerAnd satisfies the following formula:
Figure FDA0002577474360000011
in the above formula, θ is as follows:
Figure FDA0002577474360000012
in the above formula, R represents the radius of the involute spline grinding wheel in mm.
2. A tracked vehicle drive train spindle for providing increased fatigue strength life as claimed in claim 1, wherein R is 60 mm.
3. A tracked vehicle drive train spindle with improved fatigue life according to claim 1, wherein the transition fillet radii of the left transition zone (3) and the right transition zone (7) are equal and both defined as r, r being an integer and satisfying the following formula;
Figure FDA0002577474360000021
in the formula, the large diameters of the left output involute spline (2) and the right output involute spline (8) are equal and are defined as DsIn mm.
4. The tracked vehicle drive train spindle with increased fatigue life according to claim 1, wherein the diameter d of the bore (10) is such thatiSatisfies the following formula:
Figure FDA0002577474360000022
5. a tracked vehicle drive train spindle capable of improving fatigue strength life as claimed in claim 1, wherein said drive spindle left side output involute spline (2), middle input involute spline (5) and right side output involute spline (8) all adopt 30 ° tooth roots, thereby reducing the working stress of the tooth root of the involute spline.
6. The drive spindle of a crawler drive system with improved fatigue life according to claim 1, wherein shot peening is used to impart compressive residual stresses to the surface at the left transition (3) and the right transition (7).
CN201911002835.XA 2019-10-22 2019-10-22 Crawler vehicle transmission system transmission main shaft capable of improving fatigue strength life Active CN110608227B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1038055A (en) * 1996-07-29 1998-02-13 Matsushita Electric Ind Co Ltd Shaft
US7285052B1 (en) * 2002-08-19 2007-10-23 Sennax Industries, Inc. Intermediate shaft assembly
CN102425612B (en) * 2011-12-01 2014-03-19 沪东重机有限公司 Coupling for large-sized ship low-speed electric-control diesel engine strap high-pressure oil pump
CN109764055A (en) * 2018-12-03 2019-05-17 中国北方车辆研究所 A kind of design method improving the severe duty drive main shaft service life

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