SAE J1789-2002 Self-Propelled Sweepers and Scrubbers Braking Performance.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2002 Society of Automotive Engineers, Inc. All rights reserved. No part of
3、this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER:Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4
4、970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org SURFACE VEHICLE STANDARD J1789 ISSUED JUN2002 Issued2002-08 Self-Propelled Sweepers and Scrubbers Braking Performance 1.ScopeThis SAE Standard applies to self-propelled, rider operated, sweepers and scrubbers
5、 as defined in SAE J2130 with maximum machine level surface speeds up to 32 km/h. Machines capable of speeds equal to and greater than 32 km/h are not covered by this document. 1.1Purpose 1.1.1To provide minimum performance criteria for service braking systems, secondary stopping systems and parking
6、 brake systems for self-propelled street sweepers, industrial sweepers and industrial scrubbers. 1.1.2To provide test criteria by which machine braking system performance may be verified. 2.References 2.1Applicable PublicationsThe following standards form a part of the specification to the extent sp
7、ecified herein. Unless otherwise indicated, the latest revision of the publications shall apply. 2.1.1SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096 0001. SAE J2130Self-Propelled Sweepers 2.1.2ISO PUBLICATIONSAvailable from ANSI, 25 West 43rd Street, New York, NY 100
8、36-8002. ISO 6014:1986Earth-moving machineryDetermination of ground speed ISO 6016:1982Earth-moving machineryMethods of measuring the masses of whole machines, their equipment and components ISO 9248:1992Earth-moving machineryUnits for dimensions, performance and capacities, and their measurement ac
9、curacies 3.Definitions 3.1Self-Propelled Sweepers and ScrubbersMachines for sweeping and scrubbing floors and roads as defined in SAE J2130. 3.2Brake SystemsAll the components which combine together to stop and/or hold the machine. Such systems include the control(s), means of brake actuation and th
10、e brake(s). SAE J1789 Issued JUN2002 -2- 3.3Service Brake SystemPrimary system used for stopping and holding the machine. 3.4Secondary Brake SystemSystem used for stopping the machine in the event of any single failure in the service brake system. 3.5Parking Brake SystemSystem used to hold a stopped
11、 machine in a stationary position. 3.6Brake System Components 3.6.1BRAKE CONTROL(S)Component(s) directly activated by the operator to cause a force to be transmitted to the brake(s). 3.6.2BRAKE ACTUATION SYSTEMAll components between the control(s) and the brake(s) which connect them functionally. 3.
12、6.3BRAKE(S)Components which directly apply a force to oppose movement of the machine. Brakes may, for example, be of friction, electrical, hydrostatic or other fluid types. 3.7Common ComponentsComponents that perform a function in two or more brake systems. 3.8Machine MassMass of the machine that in
13、cludes the heaviest combination of manufacturer approved equipment and components (i.e., cab, protective structures, etc.), rated payload, an operator of 75 kg, full fuel, lubricating, hydraulic and cooling systems. The machine mass and payload distribution shall be according to the manufacturers sp
14、ecification. 3.9Stopping Distance, sDistance travelled by the machine from the point on the test course at which the machine brake control is initially actuated to the point where the machine comes to a complete stop. 3.10 BurnishProcedure to condition the frictional surfaces of the machine brake(s)
15、. 3.11 Brake System PressureFluid pressure available to the brake control. 3.12 Brake Application PressureFluid pressure measured at the brake. 3.13 Modulated BrakingCapability to continuously and progressively increase and decrease the braking force by operation of the brake control. 3.14 Test Cour
16、seSurface upon which the test is carried out. 3.15 Cold BrakesExpression designating brakes where; The brakes have not been actuated in the previous 1 hour, or The brakes have been cooled to 100 C or less when measured on the brake disk or on the outside of the brake drum, or In the case of totally
17、enclosed brakes, including oil-immersed brakes, the temperature measured on the outside of the housing closest to the brake is below 50 C or within the manufacturers specifications. 3.16 Maximum Machine Level Surface Speed (V)Machine speed in kilometers per hour, determined in accordance with ISO 60
18、14. SAE J1789 Issued JUN2002 -3- 4.Instrument AccuracyTest instruments used to carry out the required measurements shall conform to the requirements of ISO 9248. 5.General RequirementsThe following requirements for brake systems apply to all machines described in Section 1. 5.1Required Brake Systems
19、 5.1.1The machine shall have the following brake systems; a.A service brake system. b.A secondary brake system. c.A parking brake system. 5.1.2No brake system shall contain a disconnecting device such as a clutch or a shiftable gearbox that allows the brake(s) to be disabled. 5.1.3A power source dis
20、connect designed for cold weather starting which also disables a brake system shall require application of the parking brake prior to disconnection. 5.2Common ComponentsBrake systems may use common components. However, a failure of any single component other than a tire, or a failure of any single c
21、ommon component shall not reduce the effectiveness of the machines stopping capability to less than the secondary performance defined in 7.6.2.4, with one exception: a common control (lever, pedal, switch, etc.) may be used to actuate combined service and secondary brake systems provided that anothe
22、r dynamic braking capability is provided that will stop the machine within 120% of the dynamic stopping distances shown for the secondary brakes in 7.6.2.4. This braking capability may be applied automatically and without modulation. 5.3Service Brake System 5.3.1All machines shall meet the service b
23、rake performance requirements of 7.5 and 7.6.2.3. 5.3.2If other systems are provided with power from the service brake system, any failure in these systems shall be considered to be the same as a failure in the service brake system. 5.3.3All machines shall have brakes of equal nominal capacity ratin
24、g applicable to each wheel of at least one axle. 5.3.4The service brake system shall be of the modulated type as defined in 3.13. 5.4Secondary Brake System 5.4.1All machines shall meet the secondary brake performance requirements of 7.6.2.4. 5.5Parking Brake System 5.5.1All machines shall meet the p
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