GB2506454A - Axle drive pinion with a flange having an interference fit with a fitting part - Google Patents

Axle drive pinion with a flange having an interference fit with a fitting part Download PDF

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Publication number
GB2506454A
GB2506454A GB1221571.1A GB201221571A GB2506454A GB 2506454 A GB2506454 A GB 2506454A GB 201221571 A GB201221571 A GB 201221571A GB 2506454 A GB2506454 A GB 2506454A
Authority
GB
United Kingdom
Prior art keywords
pinion
nut
axle drive
interference fit
flange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1221571.1A
Inventor
Ranjeet Vijayswamy
Dhanesh Krishna
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler AG filed Critical Daimler AG
Priority to GB1221571.1A priority Critical patent/GB2506454A/en
Publication of GB2506454A publication Critical patent/GB2506454A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F16H57/00—General details of gearing
    • F16H57/0018—Shaft assemblies for gearings
    • F16H57/0025—Shaft assemblies for gearings with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
    • F16B39/103—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a locking cup washer, ring or sleeve surrounding the nut or bolt head and being partially deformed on the nut or bolt head, or on the object itself
    • 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
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • F16D1/033—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/14—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising conical gears only
    • F16H1/145—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising conical gears only with offset axes, e.g. hypoïd gearings
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/038—Gearboxes for accommodating bevel gears
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment
    • 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
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • F16H48/42—Constructional details characterised by features of the input shafts, e.g. mounting of drive gears thereon
    • F16H2048/423—Constructional details characterised by features of the input shafts, e.g. mounting of drive gears thereon characterised by bearing arrangement
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
    • F16H2057/02052—Axle units; Transfer casings for four wheel drive
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0221—Axial adjustment

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)

Abstract

An axle drive pinion (1, fig 1) has a pinion 2 with splines which engage with a companion flange 4 fitted on the pinion 2. A pinion nut 8 fastens the flange 4 to the pinion 2 and a fitting part 11 is positioned between an inner diameter 9 of the flange 4 and an outer diameter 10 of the nut 8, with an interference fit between the part 11 and the inner diameter 9 of the flange 4. The part 11 may fit into at least a part of the nut 8 with a transitional fit or the part 11 and nut 8 may be made of one piece. In another embodiment an inner contour of the part 11 corresponds to an outer contour of at least one part of the nut 8. The interference fit may have a fit of H7-h6 and have an axial length of between 2mm to 8mm.

Description

Axle Drive Pinion The invention relates to an axle drive pinion with a companion flange fitted onto a pinion and with a pinion nut for fastening the companion flange on the pinion.
From the general prior art such axle drive pinions are well known, Typically the companion flange is filled onto the pinion by engaged splines. Under heavy duty usage of such axle drive pinions, for example in commercial vehicles, especially in buses, the pinion nut might getting lose and starting to rotate due to high start and stop duty cycles in some regions of the application. This affecting the preload of the tapered roller bearings, which may inturn show premature failure. Typically the pinion nut is torqued to a given torque moment and stacked at one place. This holds the pinion and the companion flange together. Between the pinion and the companion flange there are typically side fit splines which have a given clearance, for example 9H -Bk. Due to this clearance in the side fit splines the splines have the tendency to slide one over the other when the torque is applied. Practically this leads to a relative motion between the splines. Therefore wear occurs.
****.. * .
It is the object of the invention to develop an axle drive pinion where the nut loosening and rotating can be avoided. * *
*;** This object of the invention is solved by using an axle drive pinion with the features of claim 1. Further preferred embodiments of the invention are using the features in the * depending sub-claims.
The axle drive pinion according to the invention is using an additional filling part which is positioned between an inner diameter of the companion flange and the pinion nut, with a interference fit between the fitting part and the inner diameter of the companion flange.
The axle drive pinion designed according to the invention has an interference fit, preferably of H7 -h6 with the companion flange and the pinion nut. This kind of arrangement would act similar to the major diameter fit of splines and the same torque which is presently used would be enough to press the pinion nut to the companion flange.
This will solve the premature pinion nut loosening issue.
With the interference fit according to the invention, preferably with a diametrical interference of 0 to -0.05, no much possible sliding of the spline will occur, thus will reduce the spline wear and thereby control the nut loosening. Additionally the increase in the surface contact area is an advantage for the load transfer, thus reducing the pressure in the spline faces. The production of the interference fit according to the invention allows easy machining and the required tolerances can be maintained easily.
According to a preferred embodiment of the axle drive pinion according to the invention the fitting part and the pinion nut are made as one piece. This means that the additionally introduced fitting part is a portion of the pinion nut, especially a ring-like portion on one side of the pinion nut, preferably the side which is directed to the companion flange. The filling part of the pinion nut can then interact with the interference fit when the pinion nut is screwed onto the pinion fastening the companion flange.
In a further embodiment of the inventive axle drive pinion the fitting part fits the pinion nut with a transitional fit. This alternative embodiment of the invention is using the fitting part as the new additional part which is positioned between the outer diameter of the pinion nut, after it is screwed to the pinion and interacts with the inner diameter of the companion flange. The fitting part can match with the outer diameter or contour of the pinion nut with a transitional fit and/or a corresponding inner contour of the fitting part.
In a further embodiment of the invention the axial length of the interference fit is between 2mm to 8mm, preferably about 5mm. With this axial length of the interference fit machining and maintaining of the required tolerances is achieved easily. The axial length *.*ø.s * a can vary as per preload requirement.
Further advantages of the invention and further embodiments are described by the depending sub-claims and will become by two examples for carrying out the invention.
The examples will be described based on the drawings.
Brief description of the drawings:
Fig. 1 shows an axle drive pinion according to the prior art.
Fig. 2 shows an example for a first embodiment of the axle drive portion according to the invention.
Fig. 3 shows an example for a second embodiment of the axle drive portion according to the invention.
Fig. 4 shows a fitting part according to the second embodiment.
In figure 1 an axle drive pinion I according to the prior art is shown. The pinion 2 is positioned between a ring gear 3 and a companion flange 4. The pinion 2 is mounted pivotable in an axle carrier 5 with tapered roller bearings 6. The companion flange 4 and the pinion 5 are engaged with splines in a spline engagement area 7. A pinion nut B is used for fastening the companion flange 4 on the pinion 2. The axle drive pinion 1 is typically used in a power drain, for example for a bus or another commercial vehicle. Due to high start and stop duty cycles in some regions of the application the pinion nut 8 is getting lose and rotating by 90 degrees. This is effecting the preload of the tapered roller bearings 6, which may inturn shown premature failure.
The pinion nut 8 as shown in figure 1 is torqued to typically 900 Nm and is stacked at one place which holds the pinion 2 and the companion flange 4 together. The side fit splines in the spline engagement area 7 of the pinion 2 and the companion flange 4 typically has clearances between each other. Due to these clearances in the side fit and major diameter fit the splines have tendency to slide over the other when torque is applied.
* Practically wear occurs only if there is rubbing between two parts. No much wear happens if there is only load transfer between two parts motionless relative to each other. If the * sliding motion is controlled, therefore the wear on the splines is controlled and inturn the loosening of the pinion nut and the rotating is arrested.
* In figure 2 therefore a new solution is shown which is using a interference fit IF of H7 -h6 at the companion flange 4, especially an inner diameter 9 of the companion flange 4 and the outer diameter 10 of a fitting part 11. In the embodiment of the inventive axle drive pinion drive 1, as shown in figure 2, the filling part 11 is made in one piece with the pinion nut 2. This kind of arrangement would act similar to the major diameter fit of splines and the same 900 Nm of torque, which is presently being used, would be enough to press the pinion nut 2 to the companion flange 4. The axial length L of interference fit maintained is about 5 mm. The machining is easier and the required tolerances can be maintained. The length L can be varied as per the preload requirement.
Another embodiment of the inventive axle drive pinion 1 is shown in figure 3. Between the outer diameter or contour of the pinion nut 2 and the inner diameter 9 of the companion flange 4 there is the fitting part 11 as a new additional part introduced while mounting the axle drive pinion 1. The fitting part 11 with its interference fit IF on the outer diameter is engaged with the pinion nut 2 with a trarsitional fit and/or a corresponding contour. This kind of arrangement would also act similar to the arrangement of the first embodiment and will solve the premature pinion nut 2 loosening issue as well.
In figure 4 the fitting part 11 according to the second embodiment of the invention is shown in a three dimensional sketch in one possible embodiment. The inner diameter in this embodiment has the same contour as the pinion nut 2, the outer diameter has a ring-like portion with the outer diameter 10 which interacts with the inner diameter 9 of the companion flange 4 in the interference fit IF. *t..
I S..,
* t a.*. * .
S * * I * *5 *. a
I a...
S
*5*beI
I

Claims (6)

  1. Claims 1. Axle drive pinion (1) with a companion flange (4) fitted onto a pinion (2), especially with engaged splines, and with a pinion nut (8) for fastening the companion flange (4) onto the pinion; wherein a fitting part (11) is positioned between an inner diameter (9) of the companion flange (4) and the pinion nut(S), with a interference fit between the fitting part (11) and the inner diameter (9) of the companion flange (4).
  2. 2. Axle drive pinion (1) according to claim 1, wherein the filling part (11) fits onto at least a part of the pinion nut(S) with a transitional fit.
  3. 3. Axle drive pinion (1) according to claim 1, wherein the fitting part (11) and the pinion nut (8) are made of one piece. "s.
  4. 4. Axle drive pinion (1) according to claim 1 or 2, wherein an inner contour of the filling part (II) corresponds to an outer contour of at least one part of the pinion nut(S). * ti * ..*
  5. 5. Axle drive pinion (1) according to one of claims ito 4, wherein the axial length (L) of the interference fit is between 2mm to 8mm, preferably about eq.. 5mm.*44t.$ * 4
  6. 6. Axle drive pinion (1) according to one of claims ito 5, wherein the interference fit is of H? -he.
GB1221571.1A 2012-11-16 2012-11-16 Axle drive pinion with a flange having an interference fit with a fitting part Withdrawn GB2506454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1221571.1A GB2506454A (en) 2012-11-16 2012-11-16 Axle drive pinion with a flange having an interference fit with a fitting part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1221571.1A GB2506454A (en) 2012-11-16 2012-11-16 Axle drive pinion with a flange having an interference fit with a fitting part

Publications (1)

Publication Number Publication Date
GB2506454A true GB2506454A (en) 2014-04-02

Family

ID=50231597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1221571.1A Withdrawn GB2506454A (en) 2012-11-16 2012-11-16 Axle drive pinion with a flange having an interference fit with a fitting part

Country Status (1)

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GB (1) GB2506454A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104819197A (en) * 2015-04-24 2015-08-05 浙江长兴前进机械铸造有限公司 Loosening prevention nut connecting structure
CN106065936A (en) * 2016-08-01 2016-11-02 浙江万里扬股份有限公司 Omnipotent bead and variator
DE102016012947A1 (en) * 2016-10-28 2018-05-03 Neumayer Tekfor Engineering Gmbh Connecting arrangement for connecting a shaft with a component

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140427C1 (en) * 1991-12-07 1993-02-25 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Inner toothed component on shaft multi-wedge profile - has ring, associated with shaft side annular shoulder, fitted with deformation ring, with second ring forming elastic support
GB2450217A (en) * 2007-06-11 2008-12-17 Ford Global Tech Llc A differential drive pinion with dual pilot surfaces

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140427C1 (en) * 1991-12-07 1993-02-25 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Inner toothed component on shaft multi-wedge profile - has ring, associated with shaft side annular shoulder, fitted with deformation ring, with second ring forming elastic support
GB2450217A (en) * 2007-06-11 2008-12-17 Ford Global Tech Llc A differential drive pinion with dual pilot surfaces

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104819197A (en) * 2015-04-24 2015-08-05 浙江长兴前进机械铸造有限公司 Loosening prevention nut connecting structure
CN106065936A (en) * 2016-08-01 2016-11-02 浙江万里扬股份有限公司 Omnipotent bead and variator
DE102016012947A1 (en) * 2016-10-28 2018-05-03 Neumayer Tekfor Engineering Gmbh Connecting arrangement for connecting a shaft with a component
US10513148B2 (en) 2016-10-28 2019-12-24 Neumayer Tekfor Engineering Gmbh Connecting arrangement for connecting a shaft to a component

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)