GB2483679A - A rotary component comprising an inner member and an outer member - Google Patents

A rotary component comprising an inner member and an outer member Download PDF

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Publication number
GB2483679A
GB2483679A GB1015464.9A GB201015464A GB2483679A GB 2483679 A GB2483679 A GB 2483679A GB 201015464 A GB201015464 A GB 201015464A GB 2483679 A GB2483679 A GB 2483679A
Authority
GB
United Kingdom
Prior art keywords
rotary component
inner part
outer part
component according
formation
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Withdrawn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
GB1015464.9A
Other versions
GB201015464D0 (en
Inventor
William Beer
Michael Mullett
Robert Sartin
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.)
Talon Engineering Ltd
Original Assignee
Talon Engineering Ltd
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 Talon Engineering Ltd filed Critical Talon Engineering Ltd
Priority to GB1015464.9A priority Critical patent/GB2483679A/en
Publication of GB201015464D0 publication Critical patent/GB201015464D0/en
Publication of GB2483679A publication Critical patent/GB2483679A/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Withdrawn legal-status Critical Current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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/12—Toothed members; Worms with body or rim assembled out of detachable parts
    • 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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels
    • 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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/1304—Structure
    • F16D2065/1316—Structure radially segmented
    • 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
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D2065/13—Parts or details of discs or drums
    • F16D2065/134—Connection
    • F16D2065/1356—Connection interlocking

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Gears, Cams (AREA)

Abstract

A rotary component 10 comprising an outer part 12 and an inner part 14. The inner part 14 having a body (24, Figure 4) from which a plurality of limbs (28, Figure 4) extend, at least one of the limbs (28) being provided with a ramped engagement formation (30, Figure 4). The formation (30) is configured to engage with a complementary receiving formation (22, Figure 2), of the outer part 12 to secure the inner part 14 to the outer part (12). Preferably the inner part 14 is aluminium and the outer part 12 is steel. The inner part 14 may have a bore 54 to receive a stop means to impede relative rotation of inner 14 and outer 12 parts. The component may be a sprocket or disc brake and it is intended that the inner part 14 and outer part 12 are not held together with rivets or similar as the shear forces experienced by the component may cause failure of the rivets.

Description

A ROTARY COMPONENT
Technical Field
The present invention relates to a rotary component. Particular embodiments of the present invention relate to a rotary component such as a sprocket or a brake disc for a vehicle such as a motorcycle.
Background to the Invention
Sprockets for use in the drive train of motorcycles, bicycles and other chain-driven vehicles are conventionally manufactured as a unitary disc having a toothed perimeter, with the teeth of the sprocket being engageable with a drive chain of the vehicle. Such sprockets are commonly manufactured from steel, due its strength and durability.
However, a disadvantage of steel in this application is its relatively high weight.
In an effort to reduce weight, two-part sprockets have been proposed, having a central disc made of a lightweight material such as aluminium and an outer toothed ring made of a stronger and more durable material such as steel, with the inner disc and the outer ring being connected together by rivets, bohs or other fastening means which pass through apertures in projections on the inner disc which, when the sprocket is assembled, overlie portions of the outer disc having corresponding apertures to receive the rivets, bolts or other fastening means.
A disadvantage of this approach is that the rivets, bolts or other fastening means are a possible cause of failure of the sprockets, as the forces exerted on them in normal use of the sprocket may cause them to shear. It will be appreciated that there is a risk of injury to the driver of a vehicle equipped with such a sprocket if the sprocket fails in this way during use of the vehicle.
I
Summary of Invention
According to a first aspect of the present invention there is provided a rotary component comprising an outer part and an inner part, the inner part having a body from which a plurality of limbs extend, at least one of the limbs being provided with a ramped engagement formation which is configured to engage with a complementary receiving formation of the outer part to secure the inner part to the outer part.
The engagement of the ramped engagement formation of the inner part with the complementaiy receiving formation of the outer part provides a strong and robust means of connecting the outer part and the inner part, since there are no axial rivets, bolts or other fastening means which may shear or otherwise fail in use of the component.
At least two of the limbs may be provided with ramped engagement formations, and at least one of the ramped engagement formations may have a curved outer edge which is configured to engage with a complementary curved inner edge of a receiving formation of the outer part.
The complementary curved edges of the engagement formation and the receiving formation increase the contact surface area of the engagement formation and the attachment formation, which improves the engagement of the engagement formation with the receiving formation.
At least two of the limbs may be provided with ramped engagement formations and at least one of the ramped engagement formations may have a generally flat outer edge to impede rotation of the inner part relative to the outer part in a direction of normal rotation of the component.
The flat outer edge of the engagement formation assists in the correct alignment of the inner part and the outer part during assembly of the component, as when the inner part and the outer part are correctly aligned the engagement of the flat outer edge with the edge of the receiving formation impedes movement of the inner part relative to the outer part in the direction of normal rotation of the component, thereby providing a stop when the inner part and the outer part are correctly aligned.
The receiving formation may be provided on an internal projection of the outer part.
The ramp of the engagement formation may rise in a normal direction of rotation of the component. This facilitates the assembly of the component and ensures that forces acting on the component in normal use act to reinforce the engagement of the inner part with the outer part.
An outer surface of an engagement formation may have a profile which is configured to engage with a complementary profile of an inner surface of a receiving formation to impede relative lateral movement between the inner part and the outer part.
The outer surface of the engagement formation may be generally convex and the inner surface of the receiving formation may be generally concave.
The inner part may be provided with a bore which extends inwardly of an engagement formation and is configured to receive stop means for impeding rotation of the inner part relative to the outer part in a direction opposite to a normal direction of rotation of the component.
The bore may be threaded and the stop means may comprise a threaded screw or bolt.
The inner part and the outer part may be of different materials For example, the inner part may be of aluminium and the outer part may be of steel. In this way the component may benefit from the properties of both materials, such that it is light weight due to the aluminium inner part but strong and durable due to the steel outer part.
According to a second aspect of the invention there is provided an outer part for a rotary component according to the first aspect of the invention.
According to a third aspect of the invention there is provided an inner part for a rotary component according to the first aspect of the invention.
According to a fourth aspect of the invention there is provided a sprocket for a vehicle, the sprocket comprising a rotary component according to the first aspect of the invention.
According to a fifth aspect of the invention there is provided a brake disc for a vehicle, the brake disc comprising a rotary component according to the first aspect of the invention.
Brief Description of the Drawpg
Embodiments of the invention will now be described, strictly by way of example only, with reference to the accompanying drawings, of which: Figure 1 is a schematic view of a sprocket according to an embodiment of one aspect of the invention; Figure 2 is a perspective view of an outer part of the sprocket shown in Figure 1; Figure 3 is a schematic view of the outer part shown in Figure 2; Figure 4 is a perspective view of an inner part of the sprocket shown in Figure 1; Figure 5 is a schematic view of the inner part shown in Figure 4; and Figure 6 is a schematic view illustrating the sprocket of Figure 1 in a partially assembled condition.
Description of the Embodiments
Referring first to Figure 1, a sprocket is shown generally at 10, and comprises an outer part 12 which is connected to an inner part 14.
As can be seen in Figures 2 and 3, the outer part 12 is generally annular, and is provided with a plurality of outwardly extending teeth 16 by means of which the sprocket 10 can engage with a drive chain of a vehicle such as a motorcycle or other chain-driven vehicle.
The outer part 12 and the inner part 14 of the sprocket 10 may be of the same material, or may be of different materials. For example, the outer part 12 may be of steel and the inner part 14 may be of aluminium, thereby reducing the weight of the sprocket 10 in comparison to known all-steel constructions, without reducing the strength and durability of the teeth 16.
The outer part 12 has a plurality of cut-outs 18 which define a plurality (in this example six) of limbs 20 which project radially inwardly from the outer part 12. Each of the limbs terminates in a receiving formation 22 which is configured to receive a complementary engagement formation of the inner part 14, as will be explained below.
The inner part 14 is shown in more detail in Figures 4 and 5, from which it can be seen that the inner part 14 has a generally annular body 24 in which are provided a plurality of mounting holes 26 by means of which the sprocket 10, when assembled, may be mounted on a wheel hub.
A plurality of limbs (in this example six) 28 extend radially outwardly of the body 24 of the inner part 14, and each of the limbs 28 terminates in an engagement formation 30 which is configured to engage with a complementary receiving formation 22 of the outer part 12, as will be explained in more detail below.
The engagement formations 30 of the limbs 28 of the inner part 14 increase in height from a lower end 32 to an upper end 34 to form a shallow ramp, which may rise, for example, by a distance of between 2mm and 6mm from the lower end 32 to the upper end 34. The ramps of the engagement formations 30 extend in the normal direction of rotation of the sprocket 10, that is to say when the inner part 14 rotates in the direction in which it would normally when the sprocket is mounted on a wheel hub of a motorcycle or other chain driven vehicle, which in the example shown in Figure 4 is clockwise, the lower end 32 will pass through a notional plane which is perpendicular to a generally vertical radius of the inner part 14 (illustrated by the dashed line in Figure 5) before the upper end 34.
As can be seen in Figure 5, some (in this example all but one) of the engagement formations 30 are curved at their outer circumferential edges, as indicated at 36 in Figure 5. Similarly, some (again in this example all but one) of the receiving formations 22 of the outer part 12 may have curved inner circumferential edges which are complementary to the curved outer edges 36 of the engagement formations 30, as illustrated at 38 in Figure 2.
This curvature of the edges 36, 38 of the engagement formations 30 and the complementary receiving formations 22 provides a greater contact area between the engagement formations 30 of the inner part 14 and the complementary receiving formations 22 of the outer part 12.
However, to aid in the correct alignment of the inner part 14 and the outer part 12 during assembly of the sprocket 10, one (or more) of the engagement formations 30 of the inner part 14 may have a flat outer edge. In this example the engagement formation shown at has a flat outer edge 42. One or more of the receiving formations 22 of the outer part 12 may also have a flat outer edge, as illustrated at 44 in Figure 2. When the inner part 14 and the outer part 12 are correctly aligned the flat outer edge 42 bears against the flat outer edge 44 and impedes rotation of the inner part 14 relative to the outer part 12 in a normal direction of rotation of the sprocket 10, thereby assisting in the correct alignment of the inner part 14 and the outer part 12 by providing a stop position at which the inner part 14 and the outer part 12 are correctly aligned.
As can be seen in Figure 5, an axial outer surface 46 of each of the engagement formations 30 has a generally convex curved profile 48. This curved profile 48 is configured to be received in a complementary generally concave curved profile 50 of an inner axial surface 52 of a receiving formation of the outer part 12. This interengagement of the profiles 48, 50 of the engagement formations 30 and the receiving formations 22 helps to impede relative lateral movement between the outer part 12 and the inner part 14 during use of the sprocket 10. Although the complementary profiles 48, 50 in this example are generally concave and convex respectively, it will be appreciated that a wide variety of profile shapes could be used to achieve the effect of impeding relative lateral movement between the outer part 12 and the inner part 14 of the sprocket 10.
Referring again to Figures 4 and 5, it can be seen that the inner part 14 is provided with threaded bores 54 which extend into the engagement formations 30 in a direction generally perpendicular to edges 56 which depend from the lower ends 32 of the engagement formations 30. The bores 54 are configured to receive a threaded screw or bolt having a head with a generally flat underside. The head of the screw or bolt, when the screw or bolt is fully received in the bore 54, overlies the joint between the limb 28 of the inner part 14 and the limb 20 of the outer part 12, thereby providing a stop to impede rotational movement of the inner part 14 relative to the outer part 12 in a direction opposite to the normal direction of rotation of the sprocket 10, which could cause the inner part 14 to become disengaged from the outer part 12. Such movement may occur, for example, when the thrortle of a motorcycle equipped with the sprocket 10 is closed, and is sometimes referred to as "reverse torque".
In this example bores 54 are provided in all of the engagement formations 30 except the engagement formation 40 with the flat edge, but it will be appreciated that fewer bores 54 may be provided if required.
A method of assembling the sprocket 10 will now be described with reference to Figure 6, which is a schematic view showing the sprocket 10 of Figure 1 in a partially assembled condition.
To assemble the sprocket 10, the inner part 14 is located within the outer part 12, with each of the engagement formations 30 being located opposite one of the cut-outs 18 of the outer part 12. The engagement formation 40 with the flat edge 42 is located opposite the cut-out 18 which is adjacent the receiving formation 22 with the flat outer edge 44.
The inner part 14 and the outer part 12 are then rotated in opposite directions relative to one another, such that the lower end 32 of each of the ramps of the engagement formations 30 of the inner part 14 come into engagement with the receiving formations 22 of the outer part 12, as is shown in Figure 6.
As the inner part 14 and the outer part continue to rotate relative to one another, the engagement formations 30 become fully engaged with the receiving formations 22, until they reach their fully assembled positions as shown in Figure 1.
At this point, the flat edge 42 of the inner engages with the complementary flat edge 44 of the outer part 12 along the entire length of the flat edges 42, 44, and this engagement of the flat edges 42, 44 impedes further relative rotational movement between the outer part 12 and the inner part 14, thereby providing a stop position and reducing the risk of misalignment of the inner part 14 and the outer part 12.
Once the inner part 14 and the outer part 12 have been correctly aligned, the screws or bolts are screwed into the bores 54 until the flat underside of their heads abuts the face 56, to provide the stop against disengagement of the inner part 14 and outer part 12 caused by reverse torque.
For extra security, the outer part 12 may be bonded to the inner part 14 during assembly by means of an epoxy resin or other suitable bonding agent.
It will be appreciated that the two-part sprocket 10 described herein with an aluminium inner part 14 and a steel outer part 12 offers a lightweight alternative to all-steel sprockets, without any reduction in the strength or durability of the teeth 16 of the sprocket, whilst being straightforward to manufacture and use.
It is to be appreciated that the principles of the invention are applicable to a wide variety of applications, and that the sprocket described above is merely one example of a rotary component according to the present invention. The principles of the invention could be applied, for example, to a brake disc for a vehicle, or to any other rotary component.

Claims (17)

  1. CLAIMS1. A rotary component comprising an outer part and an inner part, the inner part having a body from which a plurality of limbs extend, at least one of the limbs being provided with a ramped engagement formation which is configured to engage with a complementaiy receiving formation of the outer part to secure the inner part to the outer part.
  2. 2. A rotary component according to claim 1 wherein at least two of the limbs are provided with ramped engagement formations, and at least one of the ramped engagement formations has a curved outer edge which is configured to engage with a complementary curved inner edge of a receiving formation of the outer part.
  3. 3. A rotary component according to claim 1 or claim 2 wherein at least two of the limbs are provided with ramped engagement formations and at least one of the ramped engagement formations has a generally flat outer edge to impede rotation of the inner part relative to the outer part in a direction of normal rotation of the component.
  4. 4. A rotary component according to any one of the preceding claims wherein the receiving formation is provided on an intemal projection of the outer part.
  5. 5. A rotary component according to any one of the preceding claims wherein the ramp of the engagement formation rises in a normal direction of rotation of the component.
  6. 6. A rotary component according to any one of the preceding claims wherein an outer surface of an engagement formation has a profile which is configured to engage with a complementary profile of an inner surface of a receiving formation to impede relative lateral movement between the inner part and the outer part.
  7. 7. A rotary component according to claim 6 wherein the outer surface of the engagement formation is generally convex and the inner surface of the receiving formation is generally concave.
  8. 8. A rotary component according to any one of the preceding claims wherein the inner part is provided with a bore which extends inwardly of an engagement formation and is configured to receive stop means for impeding rotation of the inner part relative to the outer part in a direction opposite to a normal direction of rotation of the component.
  9. 9. A rotary component according to claim 8 wherein the bore is threaded and the stop means comprises a threaded screw or bolt.
  10. 10. A rotary component according to any one of the preceding claims wherein the inner part and the outer part are of different materials
  11. 11. A rotary component according to claim 10 wherein the inner part is of aluminium and the outer part is of steel.
  12. 12. An outer part for a rotary component according to any one of the preceding claims.
  13. 13. An inner part for a rotary component according to any one of the preceding claims.
  14. 14. A sprocket for a vehicle, the sprocket comprising a rotary component according to any one of the preceding claims.
  15. 15. A brake disc for a vehicle, the brake disc comprising a rotary component according to any one of claims 1 to 13.
  16. 16. A rotary component substantially as hereinbefore described with reference to the accompanying drawings.
  17. 17. A sprocket substantially as hereinbefore described with reference to the accompanying drawings.
GB1015464.9A 2010-09-16 2010-09-16 A rotary component comprising an inner member and an outer member Withdrawn GB2483679A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1015464.9A GB2483679A (en) 2010-09-16 2010-09-16 A rotary component comprising an inner member and an outer member

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1015464.9A GB2483679A (en) 2010-09-16 2010-09-16 A rotary component comprising an inner member and an outer member

Publications (2)

Publication Number Publication Date
GB201015464D0 GB201015464D0 (en) 2010-10-27
GB2483679A true GB2483679A (en) 2012-03-21

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GB1015464.9A Withdrawn GB2483679A (en) 2010-09-16 2010-09-16 A rotary component comprising an inner member and an outer member

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516365A (en) * 1947-01-04 1950-07-25 Cincinnati Metalcrafts Inc Laminated wheel and process of manufacturing same
GB1126574A (en) * 1964-09-29 1968-09-05 Siemens Ag Improvements in or relating to apparatus for use in the automatic recognition of characters
US20060073925A1 (en) * 2004-09-29 2006-04-06 Honda Motor Co., Ltd. Transmission with internal protective shield and bicycle incorporating same
WO2009056540A1 (en) * 2007-10-30 2009-05-07 Off Road Only For Fun Di Cerasi Alessandro Connecting flange for transmission elements of cycles and motorcycles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516365A (en) * 1947-01-04 1950-07-25 Cincinnati Metalcrafts Inc Laminated wheel and process of manufacturing same
GB1126574A (en) * 1964-09-29 1968-09-05 Siemens Ag Improvements in or relating to apparatus for use in the automatic recognition of characters
US20060073925A1 (en) * 2004-09-29 2006-04-06 Honda Motor Co., Ltd. Transmission with internal protective shield and bicycle incorporating same
WO2009056540A1 (en) * 2007-10-30 2009-05-07 Off Road Only For Fun Di Cerasi Alessandro Connecting flange for transmission elements of cycles and motorcycles

Also Published As

Publication number Publication date
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