GB2198792A - Engine-mounted compressor - Google Patents

Engine-mounted compressor Download PDF

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Publication number
GB2198792A
GB2198792A GB08728995A GB8728995A GB2198792A GB 2198792 A GB2198792 A GB 2198792A GB 08728995 A GB08728995 A GB 08728995A GB 8728995 A GB8728995 A GB 8728995A GB 2198792 A GB2198792 A GB 2198792A
Authority
GB
United Kingdom
Prior art keywords
compressor
engine
drive mechanism
driven
gear
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
GB08728995A
Other versions
GB2198792B (en
GB8728995D0 (en
Inventor
John David Birchall
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.)
Wabco Automotive UK Ltd
Original Assignee
Clayton Dewandre Co 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 Clayton Dewandre Co Ltd filed Critical Clayton Dewandre Co Ltd
Publication of GB8728995D0 publication Critical patent/GB8728995D0/en
Publication of GB2198792A publication Critical patent/GB2198792A/en
Application granted granted Critical
Publication of GB2198792B publication Critical patent/GB2198792B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/002—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for driven by internal combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Transmission Devices (AREA)

Abstract

A reciprocating air compressor adapted to be mounted on and driven by a vehicle engine through a drive mechanism such as a gear train or pair, that normally includes backlash and is connected for driving the compressor crankshaft by a uni-directional transmission, preferably a one-way clutch 26. The clutch frees the engine driven gear train from the necessity to transmit torques of alternating sense and hence eliminates noise due to rattling within the limits of gear backlash. <IMAGE>

Description

ENGINE MOUNTED AIR COMPRESSORS This invention relates to apparatus for driving a compressor, more particularly a reciprocating air compressor.
On heavy goods road vehicles it is customary for the vehicle air braking system to be supplied with compressed air by a reciprocating compressor mounted on, and driven by, the vehicle's engine. It is also common for the crankshaft of the compressor to be driven from the engines crankshaft through a train, or pair, of gears.
Inherent in the behaviour of a reciprocating air compressor with self-operating valves, is a reversal of rotational reaction torque on the compressor crankshaft as the compressor piston passes upper-deadcentre. As any simple gear drive system will always involve a degree of backlash between mating pairs of gears, this feature of the compressor's behaviour means that the direction of the backlash will be reversed as the compressor piston passes upper-deadcentre and the gears will only resume their previous positions relative to one another as the compressor drive torque again becomes positioned at the start of the compression stroke. Therefore, the drive gears will move relatively to each other within their backlash limit twice per revolution of the compressor.
This relative motion causes a mechanical rattling noise to be emitted from the gear naive train because of he characteristics of the compressor.
An object of the present invention is to prevent or greatly reduce, this noise generation.
According to the present invention we propose the combination of a reciprocating compressor having an input drive shaft, a drive mechanism connected, or for connection to, a source of motive power, and a uni-directional transmission device connected between the drive mechanism and the input shaft.
The transmission device is preferably interposed between the final drive gear to the compressor and the compressor crankshaft, and may comprise a one-way clutch, "sprag" roller bearing or simple ratchet.
One embodiment of the invention will now be described by way of example with reference to the accompanying drawing.
The compressor shown in the drawing is a single cylinder reciprocating air compressor and has a housing 10 adapted for mounting on a vehicle engine block (not shown). It has a piston 12 working in a cylinder 14 and connected by a piston rod 16 to the compressor crankshaft 18 mounted in bearings 20 in the compressor housing 10. One end of the shaft 18 protrudes from the housing 10 to provide an input shaft driven by an input drive mechanism 21 which in turn is driven by the engine. The drawing shows only the final drive gear 22 of a gear train or pair from the engine shaft.
The final drive gear 22 is mounted on the input shaft end by means of a bolt 24 and is linked with the shaft by a one-way clutch 26 such as is well known per se to those skilled in the art therefore, it is not described in detail. The clutch 24 is so arranged that in the normal direction of rotation of the compressor crankshaft, the drive is transmitted rigidly and positively to the compressor while the latter is providing a reaction torque in opposition to the drive torque. However, when the piston passes upper-deadcentre and the reaction torque becomes negative (i.e. in a sense to assist normal rotation of the compressor crankshaft) the device then allows the compressor crankshaft to accelerate away from its driven gear without transmitting the reverse torque to that gear.
Later on in the rotation cycle of the compressor crankshaft, its speed eventually falls to that of the driven gear and the device automatically takes up the drive once more from the engine gear train to the compressor. By the use of the one-way cluth 24 of any other uni-directional transmission device, the engine-driven gear train is freed from the necessity to transmit torques of alternating sense and will not, therefore, generate more noise due to rattling within the limit of gear backlash.
The invention is applicable to all situations in which the drive mechanism includes backlash or lost motion and it will therefore be understood that the invention is not restricted to a compressor driven by a gear train as in the illustrated embodiment. The drive meceis may be, for example, a chain and sprocket drive.
Although the illustrated embodiment refers to a single cylinder compressor, it will be understood that the invention is applicable also to compressors having two or more cylinders.

Claims (4)

1. The combination of a reciprocating compressor having an input drive shaft, a drive mechanism connected or for connection to a source of motive power, and a unidirectional transmission device connected between the drive mechanism and the input shaft.
2. A combination according to claim 1 wherein the unidirectional transmission device comprises a one-way clutch.
3. A combination according to claim 1 or claim 2 wherein the compressor is a single cylinder air compressor adapted to be mounted on an engine and driven thereby, the drive mechanism comprising a gear train or pair.
4. Apparatus for driving a reciprocating compressor constructed and arranged substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB8728995A 1986-12-12 1987-12-11 Engine mounted air compressors Expired - Fee Related GB2198792B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868629727A GB8629727D0 (en) 1986-12-12 1986-12-12 Engine mounted air compressors

Publications (3)

Publication Number Publication Date
GB8728995D0 GB8728995D0 (en) 1988-01-27
GB2198792A true GB2198792A (en) 1988-06-22
GB2198792B GB2198792B (en) 1991-01-30

Family

ID=10608902

Family Applications (2)

Application Number Title Priority Date Filing Date
GB868629727A Pending GB8629727D0 (en) 1986-12-12 1986-12-12 Engine mounted air compressors
GB8728995A Expired - Fee Related GB2198792B (en) 1986-12-12 1987-12-11 Engine mounted air compressors

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB868629727A Pending GB8629727D0 (en) 1986-12-12 1986-12-12 Engine mounted air compressors

Country Status (1)

Country Link
GB (2) GB8629727D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635828A1 (en) * 1988-08-23 1990-03-02 Commissariat Energie Atomique Volumetric (positive displacement) machine of the pump or compressor type which is sealed to the products pumped
EP1103741A2 (en) 1999-11-29 2001-05-30 Knorr-Bremse Systems for Commercial Vehicles Limited Drive gear train

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110043441B (en) * 2019-04-10 2024-03-19 广西玉柴机器股份有限公司 Air compressor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518031A (en) * 1968-07-18 1970-06-30 Tecumseh Products Co Motor-compressor unit
GB2142389A (en) * 1983-06-29 1985-01-16 Outboard Marine Corp Mechanism for pumping fluid

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518031A (en) * 1968-07-18 1970-06-30 Tecumseh Products Co Motor-compressor unit
GB2142389A (en) * 1983-06-29 1985-01-16 Outboard Marine Corp Mechanism for pumping fluid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635828A1 (en) * 1988-08-23 1990-03-02 Commissariat Energie Atomique Volumetric (positive displacement) machine of the pump or compressor type which is sealed to the products pumped
EP1103741A2 (en) 1999-11-29 2001-05-30 Knorr-Bremse Systems for Commercial Vehicles Limited Drive gear train
EP1103741A3 (en) * 1999-11-29 2001-11-28 Knorr-Bremse Systems for Commercial Vehicles Limited Drive gear train

Also Published As

Publication number Publication date
GB2198792B (en) 1991-01-30
GB8728995D0 (en) 1988-01-27
GB8629727D0 (en) 1987-01-21

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20041211