GB2455741A - Connecting assembly betwen a shaft and a universal joint - Google Patents

Connecting assembly betwen a shaft and a universal joint Download PDF

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Publication number
GB2455741A
GB2455741A GB0724740A GB0724740A GB2455741A GB 2455741 A GB2455741 A GB 2455741A GB 0724740 A GB0724740 A GB 0724740A GB 0724740 A GB0724740 A GB 0724740A GB 2455741 A GB2455741 A GB 2455741A
Authority
GB
United Kingdom
Prior art keywords
shaft
joint
plain
splined
universal joint
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.)
Granted
Application number
GB0724740A
Other versions
GB2455741B (en
GB0724740D0 (en
Inventor
Stuart James Tavener
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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 Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to GB0724740A priority Critical patent/GB2455741B/en
Publication of GB0724740D0 publication Critical patent/GB0724740D0/en
Publication of GB2455741A publication Critical patent/GB2455741A/en
Application granted granted Critical
Publication of GB2455741B publication Critical patent/GB2455741B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
    • F16D1/116—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling the interengaging parts including a continuous or interrupted circumferential groove in the surface of one of the coupling parts
    • 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
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/0894—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with other than axial keys, e.g. diametral pins, cotter pins and no other radial clamping
    • 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
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D3/2237—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts where the grooves are composed of radii and adjoining straight lines, i.e. undercut free [UF] type joints
    • 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
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections
    • 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
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22306—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts having counter tracks, i.e. ball track surfaces which diverge in opposite directions
    • 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
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22313—Details of the inner part of the core or means for attachment of the core on the shaft
    • 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
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22323—Attachments to the shaft of the inner joint member whereby the attachments are distanced from the core

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

A connecting assembly is arranged between a shaft 11 supported by a taper roller bearing 13 and a constant velocity (CV) universal joint 12 which connects a propshaft 17 to a final drive unit 16. The taper roller bearing 13 is one of two which, in a conventional manner, are spaced apart on the shaft 11 and whose inner races are axially clamped by a clamp nut 18 screwed on to a threaded portion 15 of the shaft 11. The CV joint 12 has an inner joint part 24 which is carried on an extension of the final drive input shaft 11, the CV joint having an integral collar 35 with a plain bore 37 which radially locates the CV joint 12 on a plain shaft portion 41 of the shaft 11. Extending from the plain shaft portion 41 is a splined portion 42 which engages with corresponding splines in a central though bore 43 in the inner joint part 24. The plain shaft portion 41 has a semi-circular circumferential groove 44 which is engaged by a roll pin 45 which is a press fit in a tangential hole in the integral collar 35. Flanges 36 and 47 allow the use of a special tool to draw the CV joint 12 onto the shaft 11 during assembly.

Description

Connectina Assembly between a Shaft and a Universal Joint The invention relates to a connecting assembly between a shaft and a universal joint having an inner joint part rotationally fast with the shaft. Such an assembly is used to connect a propshaft of a motor vehide drive to final drive unit having a differential to drive one of the pairs of wheels of the vehide. The shaft is axially and radially secured in the fvial drive with the universal joint arranged at one end of the propshaft and a transmission driven by the engine at the other end. The shaft may also be one which is suspended in a resilient intermediate bearing with the universal joint being the centre joint of a two-part or multi-part propshaft.
A problem exists in fixing the universal joint to the shaft. Conventionally, the connection between a rear propshaft universal joint and a final drive input shaft is by flanges. In such an arrangement, tolerances tend to add up as a result of out-of-round conditions of the flange relative to the final drive input shaft, out-of-round joint conditions and the fit between the universal joint and the flange. Solutions to this problem have been proposed in FR2662757A, EP1519063A and W02006/037389. However, these proposals involve the use of screwed connections which are tedious and add to assembly time.
Another solution is proposed in US200510192106A but this relies on the use of thin metal dips and damping bands and thus does not offer a precise location.
It is an object of the invention to provide a connecting assembly where the above problems are removed or alleviated.
The present invention provides a connecting assembly between a shaft and a universal joint, the shaft being supported by a rolling bearing having an inner race retained by a damp nut on a threaded portion of the shaft and the universal joint having an inner joint part which has a splined bore which is engageable with a splined portion of the shaft, wherein the shaft has a circumferential groove which is engaged by a cotter pin inserted through a hole in the inner joint part.
Conveniently, the groove is in a plain shaft portion formed between the splined portion and the threaded portion, the inner joint part having a corresponding plain bore portion which is located on the plain shaft portion, in which case the plain shaft portion preferably has a smaller diameter than the minor diameter of the threaded portion and the plain shaft portion has a larger diameter than the major diameter of the splined portion.
Preferably, the splined portion of the shaft has helical splines and the splined bore has straight splines. This helps to eliminate any baddash in the splines.
The damp nut and the inner joint part may each have a flange by which the universal joint can be drawn onto the shaft during assembly.
The invention will now be descnbed by way of example and with reference to the accompanying drawing (Fig.1) which is a cross-section through one example of a connecting assembly between a shaft journal and a universal joint according to the invention.
A connecting assembly is arranged between a shaft 11 and a constant velocity universal joint 12. The shaft 11 is supported by a taper roller bearing 13 in a housing 14 which forms part of the final drive unit 16 in the driveline of a motor vehicle. The constant velocity universal joint (CV joint) 12 is connected to a propshaft 17 to connect the final drive unit 16 to an engine and transmission assembly (not shown). The taper roller bearing 13 is one of two which, in a conventional manner, are spaced apart on the shaft 11 and whose inner races are axially damped by a damp nut 18 screwed on to a threaded portion 15 of the shaft II. The damp nut 18 is sealed relative to the axle housing 14 by a shaft seal 20.
A cover 21 secured to the damp nut 18 protects the seal 20 against mechanical damage from flying stones. etc. The CV joint 12 is of a known type and comprises an outer joint part 22 secured to the propehaft 17 by a welded-on collar 23, an annular inner joint part 24, torque transmitting balls 26 and a cage 25. Between the collar 23 and the outer joint part 22, there is inserted a cover 31 which seals the CV joint 12 towards the propshaft 17 and retains the grease filling of the joint. A sheet metal seal carrier 32 is retained on the outer circumference of the outer joint part 22 and carries a membrane seal 33 which seals the outer joint part 22 to the inner joint part 24.
The inner joint part 24 is carried on an extension of the final drive input shaft 11, having an integral collar 35 with a plain bore 37 which radially locates the CV joint 12 on a plain shaft portion 41 of the shaft 11. The plain shaft portion 41 is of a smaller diameter than the minor diameter of the threaded portion 15 to allow for assembly of the clamp nut 18 onto the shaft 11. Extending from the plain shaft portion 41 is a splined portion 42 which engages with corresponding splines in a central through bore 43 in the inner joint part 24. It is to be understood that the term Msplines includes serrations and splinedN should be construed accordingly. The plain shaft portion 41 has a semi-circular circumferential groove 44 which is engaged by a cotter pin in the form of a roll pin 45 which is a press fit in a through hole in the integral collar 35, the axis of the through hole being tangential to the diameter of the plain shaft portion 41. The integral collar 35 has a flange 36 which is adjacent a corresponding flange 47 on the clamp nut 18 and which defines one side of a rectangular groove 48. The flange 47 has castellations 49 for engagement by a castellated wrench or spanner to allow the clamp nut 18 to be tightened on initial assembly of the final drive unit 16.
The diameter of the plain shaft portion 41 is a little greater than the major diameter of the splined portion 42 so that during assembly of the CV joint 12 with the propshaft 17 on to the final drive unit 16, the splined portion 42 initially engages the plain bore 37 which can thus act as guide. Further movement of the CV joint 12 towards the final drive unit 16 allows the splined portion 42 to engage the splined bore 43. Preferably the splines on the splined portion 42 are helically inclined relative to the axis of the shaft 11 by a small amount while the splined bore 43 has straight splines, i.e. splines which are parallel to the axis of the bore 43 (and the axis of the shaft 11). This ensures that when the CV joint 12 is -4.
fully engaged on the shaft 11, circumferential play or backlash between the CV joint 12 and the shaft 11 is eliminated. Indeed, there may be some pre-stressing of the splines as a result of assembly. Since this results in the need for a substantial axial force to assemble the CV joint 12 onto the shaft 11, the flanges 36 and 47 allow the use of a special tool to draw the CV joint 12 onto the shaft 11 during assembly. Such a special tool may take the form of tongs or a clamp with forked ends to engage behind the flanges 36 and 47 to bring them together. A similar tool (or the same tool) may be used to effect removal of the CV joint 12 from the shaft 11, e.g. by bearing against the other side of the rectangular groove 44 to the flange 47 and against the seal carrier 32. Once the CV joint 12 is fully on the shaft 11, i.e. the flanges 36 and 47 are in abutment, the roll pin 45 can be inserted. A seal, e.g. bellows type, may be provided to seal the interface between the flanges 36 and 47 and the roll pin 45. Such a seal may be part of the membrane seal 33.

Claims (7)

-- CLAIMS
1. A connecting assembly between a shaft and a universal joint, the shaft being supported by a rolling bearing having an inner race retained by a clamp nut on a threaded portion of the shaft and the universal joint having an inner joint part which has a splined bore which is engageable with a splined portion of the shaft, wherein the shaft has a circumferential groove which is engaged by a cotter pin inserted through a hole in the inner joint part
2. An assembly according to claim I wherein the groove is in a plain shaft portion formed between the splined portion and the threaded portion, the inner joint part having a corresponding plain bore portion which is located on the plain shaft portion.
3. An assembly according to claim 2 wherein the plain shaft portion has a smaller diameter than the minor diameter of the threaded portion.
4. An assembly according to claim 2 or claim 3 wherein the plain shaft portion has a larger diameter than the major diameter of the splined portion.
5. An assembly according to any preceding claim wherein the splined portion of the shaft has helical splines and the splined bore has straight splines.
6. An assembly according to any preceding claim wherein the damp nut and the inner joint part each have a flange by which the universal joint can be drawn onto the shaft during assembly.
7. A connecting assembly between a shaft and a universal joint substantially as described herein with reference to the accompanying drawings.
GB0724740A 2007-12-20 2007-12-20 Connecting assembly between a shaft and a universal joint Active GB2455741B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0724740A GB2455741B (en) 2007-12-20 2007-12-20 Connecting assembly between a shaft and a universal joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0724740A GB2455741B (en) 2007-12-20 2007-12-20 Connecting assembly between a shaft and a universal joint

Publications (3)

Publication Number Publication Date
GB0724740D0 GB0724740D0 (en) 2008-01-30
GB2455741A true GB2455741A (en) 2009-06-24
GB2455741B GB2455741B (en) 2011-08-31

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GB0724740A Active GB2455741B (en) 2007-12-20 2007-12-20 Connecting assembly between a shaft and a universal joint

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB955148A (en) * 1959-08-19 1964-04-15 Walterscheid Gmbh Jean Improvements relating to releasable locking pins
GB1088147A (en) * 1965-07-08 1967-10-25 Vauxhall Motors Ltd Universal joints
GB1100040A (en) * 1962-09-26 1968-01-24 Anthony Valentine Weasler Quickly detachable connection for coupled shaft elements
WO2007076353A1 (en) * 2005-12-23 2007-07-05 Gkn Driveline North America, Inc. Direct torque flow constant velocity joint having a non-rotating boot

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB955148A (en) * 1959-08-19 1964-04-15 Walterscheid Gmbh Jean Improvements relating to releasable locking pins
GB1100040A (en) * 1962-09-26 1968-01-24 Anthony Valentine Weasler Quickly detachable connection for coupled shaft elements
GB1088147A (en) * 1965-07-08 1967-10-25 Vauxhall Motors Ltd Universal joints
WO2007076353A1 (en) * 2005-12-23 2007-07-05 Gkn Driveline North America, Inc. Direct torque flow constant velocity joint having a non-rotating boot

Also Published As

Publication number Publication date
GB2455741B (en) 2011-08-31
GB0724740D0 (en) 2008-01-30

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