[go: up one dir, main page]

GB2158180A - A belt drive arrangement - Google Patents

A belt drive arrangement Download PDF

Info

Publication number
GB2158180A
GB2158180A GB08411587A GB8411587A GB2158180A GB 2158180 A GB2158180 A GB 2158180A GB 08411587 A GB08411587 A GB 08411587A GB 8411587 A GB8411587 A GB 8411587A GB 2158180 A GB2158180 A GB 2158180A
Authority
GB
United Kingdom
Prior art keywords
belt
pulley
pulleys
face
driven
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
GB08411587A
Other versions
GB2158180B (en
GB8411587D0 (en
Inventor
Geoffrey Ernest Josey
Roy William Horrocks
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 Motor Co
Original Assignee
Ford Motor Co
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 Motor Co filed Critical Ford Motor Co
Priority to GB08411587A priority Critical patent/GB2158180B/en
Publication of GB8411587D0 publication Critical patent/GB8411587D0/en
Publication of GB2158180A publication Critical patent/GB2158180A/en
Application granted granted Critical
Publication of GB2158180B publication Critical patent/GB2158180B/en
Expired 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/06—Endless member is a belt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

In a belt drive arrangement, pulleys are driven off both the front and the back of the belt 20. The front of the belt 20 is configured to provide positive engagement with the front-driven pulleys (16,22,26). The back of the belt is flat, and at least one of the back-driven pulleys (38) has a circumference of a material which has a high coefficient of friction with the belt material. The back-driven pulley may be of metal, with a rubber tyre on it. <IMAGE>

Description

SPECIFICATION A belt drive arrangement This invention relates to a belt drive arrangement where rotary motion from one driven pulley is transferred to another pulley by a belt which is held in tension around both pulleys.
Belt drives are used in many applications.
One typical application is in the timing gear of an internal combustion engine. In this application, as in other applications, the belt may transfer rotary motion between a number of pulleys. Another typical application is in the use of a poly-Vee belt to transfer torque between a number of pulleys.
In some belt drive arrangements, the belt is in contact with some pulleys inside the envelope bounded by the belt and with some pulleys outside the envelope.
The belt used in a belt drive is often configured to ensure proper driving engagement with the pulleys it has to drive. Normally, only the inside of the belt is configured in this way, and then it is difficult to ensure proper driving engagement with the outside pulleys without using excessive belt tension. It is known to configure both the inside and the outside of the belt to engage with the pulleys on the inside and on the outside, but this leads to increased cost of the belt.
According to the invention, there is provided a belt drive arrangement comprising a driving belt having a first face in driving engagement with a plurality of first pulleys and a second, flat face, wherein at least one second pulley is driven from the second, flat face and said second pulley has a circumferential surface formed from a material which has a high coefficient of friction with the belt material.
It is possible that the first face may also be flat, but it is preferred if the first face and the pulleys it drives are configures to provide positive engagement between them.
The first face of the driving belt may have lateral teeth which positively engage with axially-directed grooves on the first pulleys.
The second pulley (or pulleys) are preferably of metal and have a tyre mounted around their circumferential surfaces. The tyre may be made of synthetic rubber.
The arrangement may form the timing gear of an internal combustion engine, where the belt is a timing belt which has a first toothed face in positive driving engagement with a pulley on the engine camshaft and with another pulley, and where a second pulley driven from the second, flat face of the belt drives the water pump for the engine.
With this arrangement, the belt tension can be reduced below that which would be necessary if the second pulley had a steel circumferential surface, while still providing satisfactory drive between the belt and the pulley.
Lower belt tension leads to reduced shaft bearing loads, in particular camshaft bearing loads and also leads to an increased working life for the belt.
Alternatively, if high belt tension and high bearing loads are not a problem, the belt tension can be maintained or increased and higher torques can be transmitted than was previously the case.
The belt may be a poly-Vee belt which transfers torque between a number of pulleys, but the invention is not limited to any particular type of belt, and includes any type of transmission belt within its scope.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is an end view of an engine timing gear; Figure 2 is a perspective view of a belt; and Figure 3 is a cross-section through the water pump drive pulley.
The timing gear shown in Fig. 1 is for use on a direct injection diesel engine, although similar arrangements can be used for other types of internal combustion engine. A first timing belt 10 is driven by a pulley 1 2 on the engine crankshaft 14. This belt then drives a pulley 1 6 which is mounted on a fuel injection pump shaft 18. A second timing belt 20 is driven by another pulley coaxial with the pulley 1 6 on the fuel injection pump shaft 1 8 and drives a pulley 22 on the camshaft 24 as well as a pulley 26 on an auxiliary shaft.
Tensioning rollers 28 and 30 keep the belts 10 and 20 in tension. Each belt has a profile of the form shown in Fig. 2 with teeth 32 on a front face 34 and with a flat back face 36.
The pulleys 12, 16, 22 and 26 are all formed with corresponding grooves to mate with the teeth 32, so that the rotation of all the pulleys is maintained in the proper, timed relationship.
A pulley 38 (see Fig. 3) mounted on the shaft 40 of a water pump 42 is driven from the back face 36 of the belt 20. This pulley has a cylindrical outer circumferential face 44 with a tyre 46 on this face. The tyre material will be chosen to produce a high coefficient of friction between itself and the material of the belt 20. A synthetic rubber may be suitable, but there may be other materials which are equally suitable.
Fig. 1 also shows an alternator 48 driven by a conventional poly-Vee belt 50 from the crankshaft 14.
1. A belt drive arrangement comprising a driving belt having a first face in driving engagement with a plurality of first pulleys and a second, flat face, wherein at least one second pulley is driven from the second, flat face and said second pulley has a circumfer
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A belt drive arrangement This invention relates to a belt drive arrangement where rotary motion from one driven pulley is transferred to another pulley by a belt which is held in tension around both pulleys. Belt drives are used in many applications. One typical application is in the timing gear of an internal combustion engine. In this application, as in other applications, the belt may transfer rotary motion between a number of pulleys. Another typical application is in the use of a poly-Vee belt to transfer torque between a number of pulleys. In some belt drive arrangements, the belt is in contact with some pulleys inside the envelope bounded by the belt and with some pulleys outside the envelope. The belt used in a belt drive is often configured to ensure proper driving engagement with the pulleys it has to drive. Normally, only the inside of the belt is configured in this way, and then it is difficult to ensure proper driving engagement with the outside pulleys without using excessive belt tension. It is known to configure both the inside and the outside of the belt to engage with the pulleys on the inside and on the outside, but this leads to increased cost of the belt. According to the invention, there is provided a belt drive arrangement comprising a driving belt having a first face in driving engagement with a plurality of first pulleys and a second, flat face, wherein at least one second pulley is driven from the second, flat face and said second pulley has a circumferential surface formed from a material which has a high coefficient of friction with the belt material. It is possible that the first face may also be flat, but it is preferred if the first face and the pulleys it drives are configures to provide positive engagement between them. The first face of the driving belt may have lateral teeth which positively engage with axially-directed grooves on the first pulleys. The second pulley (or pulleys) are preferably of metal and have a tyre mounted around their circumferential surfaces. The tyre may be made of synthetic rubber. The arrangement may form the timing gear of an internal combustion engine, where the belt is a timing belt which has a first toothed face in positive driving engagement with a pulley on the engine camshaft and with another pulley, and where a second pulley driven from the second, flat face of the belt drives the water pump for the engine. With this arrangement, the belt tension can be reduced below that which would be necessary if the second pulley had a steel circumferential surface, while still providing satisfactory drive between the belt and the pulley. Lower belt tension leads to reduced shaft bearing loads, in particular camshaft bearing loads and also leads to an increased working life for the belt. Alternatively, if high belt tension and high bearing loads are not a problem, the belt tension can be maintained or increased and higher torques can be transmitted than was previously the case. The belt may be a poly-Vee belt which transfers torque between a number of pulleys, but the invention is not limited to any particular type of belt, and includes any type of transmission belt within its scope. The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is an end view of an engine timing gear; Figure 2 is a perspective view of a belt; and Figure 3 is a cross-section through the water pump drive pulley. The timing gear shown in Fig. 1 is for use on a direct injection diesel engine, although similar arrangements can be used for other types of internal combustion engine. A first timing belt 10 is driven by a pulley 1 2 on the engine crankshaft 14. This belt then drives a pulley 1 6 which is mounted on a fuel injection pump shaft 18. A second timing belt 20 is driven by another pulley coaxial with the pulley 1 6 on the fuel injection pump shaft 1 8 and drives a pulley 22 on the camshaft 24 as well as a pulley 26 on an auxiliary shaft. Tensioning rollers 28 and 30 keep the belts 10 and 20 in tension. Each belt has a profile of the form shown in Fig. 2 with teeth 32 on a front face 34 and with a flat back face 36. The pulleys 12, 16, 22 and 26 are all formed with corresponding grooves to mate with the teeth 32, so that the rotation of all the pulleys is maintained in the proper, timed relationship. A pulley 38 (see Fig. 3) mounted on the shaft 40 of a water pump 42 is driven from the back face 36 of the belt 20. This pulley has a cylindrical outer circumferential face 44 with a tyre 46 on this face. The tyre material will be chosen to produce a high coefficient of friction between itself and the material of the belt 20. A synthetic rubber may be suitable, but there may be other materials which are equally suitable. Fig. 1 also shows an alternator 48 driven by a conventional poly-Vee belt 50 from the crankshaft 14. CLAIMS
1. A belt drive arrangement comprising a driving belt having a first face in driving engagement with a plurality of first pulleys and a second, flat face, wherein at least one second pulley is driven from the second, flat face and said second pulley has a circumfer ential surface formed from a material which has a high coefficient of friction with the belt material.
2. A belt drive arrangement as claimed in Claim 1, wherein the first face of the driving belt has lateral teeth which positively engage with axially-directed grooves on the first pulleys.
3. A belt drive arrangement as claimed in any preceding claim, wherein the belt is a poly-Vee belt.
4. A belt drive arrangement as claimed in any preceding claim, wherein the second pulley (or pulleys) are of metal and have a tyre mounted around their circumferential surfaces.
5. A belt drive arrangement as claimed in Claim 4, wherein the tyre is made of synthetic rubber.
6. A belt drive arrangement as claimed in any preceding claim, and forming the timing gear of an internal combustion engine, where the belt is a timing belt which has a first toothed face in positve driving enggagement with a pulley on the engine camshaft and with another pulley, and where a second pulley driven from the second, flat face of the belt drives the water pump for the engine.
7. A belt drive arrangement substantially as herein described with reference to the accompanying drawings.
GB08411587A 1984-05-05 1984-05-05 A belt drive arrangement Expired GB2158180B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08411587A GB2158180B (en) 1984-05-05 1984-05-05 A belt drive arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08411587A GB2158180B (en) 1984-05-05 1984-05-05 A belt drive arrangement

Publications (3)

Publication Number Publication Date
GB8411587D0 GB8411587D0 (en) 1984-06-13
GB2158180A true GB2158180A (en) 1985-11-06
GB2158180B GB2158180B (en) 1987-06-17

Family

ID=10560560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08411587A Expired GB2158180B (en) 1984-05-05 1984-05-05 A belt drive arrangement

Country Status (1)

Country Link
GB (1) GB2158180B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274976A (en) * 1993-02-10 1994-08-17 Btr Plc Stair cleaning device
EP1217256A1 (en) 2000-12-21 2002-06-26 The Goodyear Tire & Rubber Company Power transmission drive system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1316903A (en) * 1970-06-08 1973-05-16 Goodyear Tire & Rubber Belt and belt drive assembly
GB1432524A (en) * 1973-08-22 1976-04-22 Dayco Corp Endless power transmission belt drive system
EP0011986A1 (en) * 1978-11-27 1980-06-11 Mitsuboshi Belting Ltd. Drive power transmission system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1316903A (en) * 1970-06-08 1973-05-16 Goodyear Tire & Rubber Belt and belt drive assembly
GB1432524A (en) * 1973-08-22 1976-04-22 Dayco Corp Endless power transmission belt drive system
EP0011986A1 (en) * 1978-11-27 1980-06-11 Mitsuboshi Belting Ltd. Drive power transmission system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274976A (en) * 1993-02-10 1994-08-17 Btr Plc Stair cleaning device
US5377375A (en) * 1993-02-10 1995-01-03 Btr Plc Stair cleaning device
GB2274976B (en) * 1993-02-10 1996-07-24 Btr Plc Cleaning device
EP1217256A1 (en) 2000-12-21 2002-06-26 The Goodyear Tire & Rubber Company Power transmission drive system
US6672983B2 (en) 2000-12-21 2004-01-06 The Goodyear Tire & Rubber Company Power transmission drive system

Also Published As

Publication number Publication date
GB2158180B (en) 1987-06-17
GB8411587D0 (en) 1984-06-13

Similar Documents

Publication Publication Date Title
US5224903A (en) Chain wheel having a shrink ring made of a polymer material
KR100237230B1 (en) Serpentine drive system with coil spring alternator connection
US4716864A (en) Camshaft drive for an internal combustion engine
US6302073B1 (en) Device for adjusting the phase angle of a camshaft of an internal combustion engine
US6440022B1 (en) Double-meshing type silent chain and sprocket for meshing with the chain along outer circumference thereof
US20060122014A1 (en) Pulley for a power transmission member, a separate starter-alternator fitted with such a pulley, and an engine drive system
US7052420B2 (en) Over-running clutch pulley with coating material
US6691846B2 (en) Over-running clutch pulley with shortened depth
GB1496050A (en) Engine with engine balancers
CN1066524C (en) Stepless transmitter
KR100395362B1 (en) Pulley unit
US3334524A (en) Power transmission belts
JP3811569B2 (en) Engine crankshaft, accessory pulley unit
GB2158180A (en) A belt drive arrangement
EP0926392B1 (en) Transmission chain
GB1491472A (en) Roller clutch drive component
GB2094439A (en) Toothed belt and valve gear for an internal combustion engine
EP0781906B1 (en) Apparatus for driving alternator of engine, and alternator for engine accessoires used therefor
KR200213480Y1 (en) Sprocket Structure for Automotive Engine
JPS63120950A (en) Continuously variable transmission
JPH0195538U (en)
JP4003633B2 (en) Engine starter
JPH032650Y2 (en)
KR19990020973A (en) Tension Reduction Structure of Timing Belt
KR200245461Y1 (en) Timing Gears

Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 19940418

PCNP Patent ceased through non-payment of renewal fee

Effective date: 19990505