GB2214843A - Process for making the outer ring body of a freewheel device for bicycles - Google Patents

Process for making the outer ring body of a freewheel device for bicycles Download PDF

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Publication number
GB2214843A
GB2214843A GB8808225A GB8808225A GB2214843A GB 2214843 A GB2214843 A GB 2214843A GB 8808225 A GB8808225 A GB 8808225A GB 8808225 A GB8808225 A GB 8808225A GB 2214843 A GB2214843 A GB 2214843A
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United Kingdom
Prior art keywords
teeth
ring body
stage
ring
size
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Withdrawn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
GB8808225A
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GB8808225D0 (en
Inventor
Alfred Heinrich Thun
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB8808225D0 publication Critical patent/GB8808225D0/en
Publication of GB2214843A publication Critical patent/GB2214843A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H55/00Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02Toothed members; Worms
    • F16H55/30Chain-wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/14Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00Freewheels or freewheel clutches
    • F16D41/24Freewheels or freewheel clutches specially adapted for cycles
    • F16D41/30Freewheels or freewheel clutches specially adapted for cycles with hinged pawl co-operating with teeth, cogs, or the like

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Forging (AREA)

Description

1 2214843 PROCESS FOR MAKING THE OUTER RING BODY OF A FREEWHEEL DEVICE FOR
BICYCLES The invention concerns a process for making the outer ring body of a freewheel device for bicycles, the outer ring body having teeth directed radially outwards with which the driving chain of the bicycle engages, ratchet teeth directed radially inwards which cooperate with the ratchet pawl of the freewheel device, and circular rims projecting sideways formed on the outer ring body which have bearing races on the sides adjacent the ratchet teeth, for the balls of a ball bearing.
With the state of the art such outer ring bodies are still produced in such a way that first a disc-shaped body is forged out of solid material, from which the middle part is then punched out in order to obtain a ring body. The forged piece must then be further worked upon, especially with turning tools, in order to obtain the appropriate surface formations in the desired places.
This method of working is very time consuming and is associated with relatively high losses of material.
Starting from this state of the art, the object of the invention is to provide a process of the generic type by which much more economical production is possible and with considerable savings in material.
i 2 - 1 To provide the solution a broad aspect of the invention proposes that:
J a) a ring is bent from steel rod and the abutting ends are welded together; and b) the ring is preshaped cold and pressed flat so that a ring body with a substantially cross-shaped cross-section is formed.
An embodiment of the invention proposes that:
a) a ring is bent from steel rod and the abutting ends are welded together; b) the ring is preshaped cold and pressed flat so that a ring body with a substantially cross-shaped cross-section is formed; c) the outer edge of the ring body is adjusted to an appropriate size for the size of the corresponding chain; d) the outer set of teeth and the inner set of teeth are formed by pressing out parts of the inner edge and the outer edge; e) the edges of the teeth of the outer set of teeth and the inner set of teeth are chamfered and the teeth of the inner set of teeth are adjusted to size; and, f) the bearing races for the balls are adjusted to size.
-3 It is thought to be preferable that the process stages b) t f) should be performed in a machine press working in 5 stages.
1 Usually 5-stage machines are used, and so it is desirable to set up the production process in five operating stages.
The division of the individual production sequence into the five stages is basically optional, however the above described division is preferred. If required it can also be advantageous if stage e) and stage f) are combined into a single operation.
It is also considered to be preferable if in a continuation of stage a) the diameter and the cross-section of the ring are adjusted to size. These procedures and also stage a) are performed outside the machine press.
Moreover it is considered to be preferable if the starting material forming the ring in stage a) is bent with a material thickness of about 10 mm. to a diameter of about 55 to 60 mm.
An embodiment of the invention is described in more detail in the following, with reference to the drawings.
FIGURES 1 to 5 show the various production stages; FIGURE 6 shows a complete freewheel device in front view; and FIGURE 7 shows the same turned through 90 0, partially sectioned.
The starting point for production of an outer ring body 1 of a freewheel device 2 for a bicycle is a length of circular rod formed into a ring as shown in Figure 1. From this length of circular rod an outer ring body should be produced which has teeth 3 directed radially outwards, with which the driving chain of the bicycle should engage. In addition the outer ring body 1 has ratchet teeth 4 directed radially inwards, which cooperate with the corresponding ratchet of the freewheel device 2. Furthermore, the outer ring body 1 has circular rims 5 projedting sideways which form bearing races on their sides adjacent the ratchet teeth 4, for the balls 6 of the ball bearing of the freewheel device. The course of production is the following:
From the length of circular rod a ring is first bent as in Figure 1, which should have a diameter D of about 55 to 60 mm. The thickness d of the material of the ring should thereby be about 10 mm. The abutting ends of the bent rod are butt-welded and any resulting burrs are removed. The ring, as shown in Figure 2, produced in this way is cold shaped in stages, first into a shape as shown in Figure 3, whereby - in a shaping and pressing process the ring shape of Figure 2 is shaped and flat pressed in such a way that a substantially cross-shaped cross- section results, as is shown in Figure 3. After this first preceding shaping process it can be arranged that the diameter and cross-section of the ring body as in Figure 2 can be adjusted to size. The starting material for the ring is relatively soft steel, for example grade C 10, usually with a carbon content of less than 0.1%.
In a next process stage the outer edge of the ring body as in Figure 3 is adjusted fo r the size Of the corresponding chain as can be seen from Figure 4.
In a next process stage the outer set of teeth and the inner set of teeth are formed by pressing out parts of the inner edge and the outer edge, as can be seen from Figure 5.
In a next process stage the edges of the teeth of the outer set of teeth and the inner set of teeth are machined to provide a chamfered profile as shown in Figure 7.
In addition, preferably simultaneously or in a connected process stage, the teeth of the inner set of teeth are adjusted in size. This process stage can also be combined with a process stage in which the bearing races for the 6 - balls 6 are adjusted to size. The production is preferably, with regard to the cold shaping and size adjustment, divided 1 into a 5 stage process, since the customary machine presses work in 5 stages.
Through the process according to the invention only very little material is discarded, so that overall a material-saving method of production is obtained. Furthermore, production is possible with only cold shaping, which results in corresponding energy savings.
Moreover, the method of production is very economical to perform, so that the production costs can also be kept low.
The invention is not limited to this example of an embodiment, but can be altered in many ways within the scope of the disclosure.
All new individual features or combinations of features published in the description and/or drawing are considered to be essential parts of the invention.
7 4 111

Claims (7)

1. A process for making the outer ring body of a freewheel device" for bicycles, the outer ring body having teeth directed radially outwards with which the driving chain of the bicycle engages, ratchet teeth directed radially inwards-which cooperate with the ratchet pawl of the freewheel device, and circular rims projecting sideways formed on the outer ring body which have bearing races on their sides adjacent the ratchet teeth, for the balls of a ball bearing; the process including the following stages: a) a ring is bent from steel rod and the abutting ends are welded together; b) the ring is preshaped cold and pressed flat so that a ring body with a substantially cross-shaped cross-section is formed; C) the outer edge of the ring body is adjusted to an appropriate size for the size of the corresponding chain; d) the outer set of teeth and the inner set of teeth are formed by pressing out parts of the inner edge and the edge; e) the edges of the teeth of the outer set of teeth and the inner set of teeth are chamfered and the teeth of the inner set of teeth are adjusted to size; and, f) the bearing races for the balls are adjusted to size.
2. A process according to claim 1, characterized in that the proce ss stages b) to f) are performed in a machine press working in 5 stages.
3) A process according to claim 1 or 2, characterized in that stage e) and stage f) are combined into a single process stage.
4. A process for making the outer ring body of a freewheel device for bicycles which includes the following stages: a) bending a ring from steel rod and welding the abutting ends together; and b) cold shaping and flat pressing the ring so that a ring body with a substantially cross- shaped cross-section is formed.
5. A process according to any one of claims 1 to 4, characterized in that in a continuation of stage a) the diameter and the cross-section of the ring are adjusted to size.
6. A process according to any one of claims 1 to 5, characterized in that the ring made in stage a) which forms the starting material has a material thickness of about 10 mm and a diameter of about 55 to 60 mm.
1 1
7. A process for making the outer ring body of a freewheel device for bicycles substantially as described herein with j reference to the accompanying drawings.
Published 1989 atThe Patent Office, State House, 66171 High Holbora, London W01R 4TP. Further copies maybe obtained from The Patent Office. Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Coll. 1/87
GB8808225A 1988-02-09 1988-04-08 Process for making the outer ring body of a freewheel device for bicycles Withdrawn GB2214843A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883803889 DE3803889A1 (en) 1988-02-09 1988-02-09 METHOD FOR PRODUCING THE OUTER RING BODY OF A FREEWHEEL FOR BICYCLES

Publications (2)

Publication Number Publication Date
GB8808225D0 GB8808225D0 (en) 1988-05-11
GB2214843A true GB2214843A (en) 1989-09-13

Family

ID=6346970

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8808225A Withdrawn GB2214843A (en) 1988-02-09 1988-04-08 Process for making the outer ring body of a freewheel device for bicycles

Country Status (3)

Country Link
CN (1) CN1034884A (en)
DE (1) DE3803889A1 (en)
GB (1) GB2214843A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2348261A (en) * 1998-12-24 2000-09-27 Tsubakimoto Chain Co Double-meshing-type silent chain and various sprockets for use therewith
CN101823203A (en) * 2010-03-30 2010-09-08 冯建荣 Method for processing V-shaped straight-hole single-groove stamping part belt pulley
WO2012002865A1 (en) 2010-07-02 2012-01-05 Aktiebolaget Skf A bearing ring and a method for its manufacturing
EP2608904A1 (en) * 2010-07-02 2013-07-03 Aktiebolaget SKF A hollow gear ring and method for its manufacturing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017202301A1 (en) 2017-02-14 2018-08-16 Zf Friedrichshafen Ag Gear shaft connection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB503187A (en) * 1938-10-07 1939-04-03 Ernest Arnold Radnall A new or improved method of manufacturing ball races
GB2179570A (en) * 1985-08-30 1987-03-11 Maillard Maurice Ets Process for the production of a three-sprocket freewheel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB503187A (en) * 1938-10-07 1939-04-03 Ernest Arnold Radnall A new or improved method of manufacturing ball races
GB2179570A (en) * 1985-08-30 1987-03-11 Maillard Maurice Ets Process for the production of a three-sprocket freewheel

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2348261A (en) * 1998-12-24 2000-09-27 Tsubakimoto Chain Co Double-meshing-type silent chain and various sprockets for use therewith
US6334829B1 (en) 1998-12-24 2002-01-01 Tsubakimoto Chain Co. Double-meshing-type silent chain drive and sprocket used therein
US6419604B2 (en) 1998-12-24 2002-07-16 Tsubakimoto Chain Co. Double-meshing-type silent chain drive and sprocket used therein
GB2348261B (en) * 1998-12-24 2002-12-18 Tsubakimoto Chain Co Double-meshing-type silent chain drive and sprocket used therein
CN101823203A (en) * 2010-03-30 2010-09-08 冯建荣 Method for processing V-shaped straight-hole single-groove stamping part belt pulley
WO2012002865A1 (en) 2010-07-02 2012-01-05 Aktiebolaget Skf A bearing ring and a method for its manufacturing
EP2591242A1 (en) * 2010-07-02 2013-05-15 Aktiebolaget SKF A bearing ring and a method for its manufacturing
EP2608904A1 (en) * 2010-07-02 2013-07-03 Aktiebolaget SKF A hollow gear ring and method for its manufacturing
EP2591242A4 (en) * 2010-07-02 2014-05-14 Skf Ab A bearing ring and a method for its manufacturing
EP2608904A4 (en) * 2010-07-02 2014-05-14 Skf Ab A hollow gear ring and method for its manufacturing
RU2569171C2 (en) * 2010-07-02 2015-11-20 Актиеболагет Скф Bearing ring and procedure for its fabrication
US9360050B2 (en) 2010-07-02 2016-06-07 Aktiebolaget Skf Bearing ring and a method for its manufacturing

Also Published As

Publication number Publication date
CN1034884A (en) 1989-08-23
DE3803889A1 (en) 1989-08-17
GB8808225D0 (en) 1988-05-11

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