14 (0.55 in) MU-2 Brake Caliper. Caliper with Tension Spring Part No Weight (caliper only) kg (1.65 lb)

Transcription

1 MU (Mk ) Series Disc Brake Caliper DB00 9 M0 Mounting Bolt Grade Tighten to Nm (.9 lbf-ft) Bolt not supplied with Caliper. A A 0 (. in) (.99 in) Crs Crs (.0 in) (0. in) ø0 (. in) Section on A-A MU- Brake Caliper Caliper with Tension Spring Part No. 09. Weight (caliper only)- 0.0 kg (. lb) Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 M0 Plain Washer 000 Tension Spring 0009 Grooved Pin Brake Pad 000 General Description The MU series of disc brake calipers is the smallest in the Twiflex range and is designed for light duty stopping and holding applications. The range consists of three spring applied, air released brake calipers type MUS, MUS and MUS; one handwheel adjustable spring applied, brake caliper type MUH; one air applied, spring released disc brake caliper type MU and one direct air applied brake caliper type MUP. This range of brakes is normally used with mm (0. in) thick discs having a minimum dia. of 0mm (.9 in), (these are not available from the standard Twiflex range), but the MUS caliper will accommodate discs up to mm (0. in) thick. With a revised thruster mounting arrangement (see page ) the MUS and MU calipers can be used with standard Twiflex discs.mm (0.0 in) thick. The MUS disc brake caliper, the smallest in the spring applied series, has a spring loaded piston type thruster The MUS disc brake caliper, the next in the series, is intended mainly for light holding duties (or for very occasional stopping applications). It has a diaphragm type thruster. No adjustment for brake pad wear is provided. The MUS caliper is similar to the US but has a heavier spring. This brake is used for normal stopping and holding duties. Both the MUS and MUS calipers have an adjusting screw in the push rod which allows the braking force to be maintained, provided regular adjustments are made to compensate for brake pad wear. The maximum air pressure to be used with these calipers is bar (0 psi).

2 Disc Brake Caliper: Type MUS - Spring Applied, Air Released Light duty, stopping and holding. to (.0 to.9 in) 0 to 0 (. to. in) 0 (. in) Dimension X see Note X 0 Air Inlet Port G / [/ BSP] 0 9 (. in) 0 (.09 in) (.0 in) (0. in) to Edge of Disc 9 9 Use M0 Grade Mounting Bolt Tightening Torque Nm (.9 lbf-ft) Bolt not supplied with Caliper Disc Brake Caliper Assembly Type MUS Note: Set dimension X to mm (.9 in) with brake ON. This setting corresponds to maximum Braking Force setting. Readjust setscrew (item ) when dimension X exceeds 0mm (0.9 in). To avoid damage to thruster diaphragm do not turn the Piston Rod while adjusting the setscrew. Brake Disc (0. in) Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 M0 Plain Washer 000 Tension Spring 0009 Grooved Pin Brake Pad Cylinder Technical Data MUS: Thruster only Part No. 0(S). Caliper only Part No. 09. Complete assembly (Caliper and thruster) Part No. 09. Weight (complete assembly)-.0kg (.00 lb) Minimum brake disc diameter- 0mm (.9 in) Disc thickness (Standard) - mm (0. in) New pad dimensions- 0x0xmm (. x.9 x 0. in) thick Brake pad wear allowance - mm (0.0 in) each pad Total pad area - 0cm (. in ) Minimum pressure for full retraction -. bar ( psi). Maximum pressure- bar (0 psi) Piston End Cover 09 Compression Spring 00 O-Ring 000 O-Ring 000 Spacer 09 M Adjusting Screw 000 M Full Nut 00 9 Internal Circlip / BSP Nut 000 Braking Force 00 N ( lbf) at coefficientof friction m = 0. Brake torque (Nm) = Braking force (N) x effective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

3 Disc Brake Caliper: Type MUS - Spring Applied, Air Released Holding Duties and Occasional Stopping to (.0 to. in) to (. to.0 in) Air Inlet Port G / [/ BSP] 0 0 (. in) 9 To Edge of Disc (0. in) 9 Brake Disc (See Text) (0. in) Use M0 Grade Mounting Bolt. Tightening Torque Nm (.9 lbf-ft) Bolt not supplied with Caliper (. in) 0 (. in) Disc Brake Caliper Assembly Type MUS Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 M0 Plain Washer 000 Tension Spring 0009 Grooved Pin Brake Pad Front Cap 09 Rear Cap 09 Diaphragm 009 Thruster Spring Cap 090 Piston Rod 09 Piston Rod Plate 09 Spacer 09 Comression Spring 0090 O-Ring Quad Seal Pressure Washer 009 Mx Skt Hd Cap Screw 00 M Light Washer 00 / BSP Nut 000 M Nut 009 Mx Skt Hd Cap Screw 000 Technical Data MUS: Thruster only Part No. 0(S). Caliper only Part No. 09. Complete assembly (Caliper and thruster) Part No. 09. Weight (complete assembly)-.00kg (. lb) Minimum brake disc diameter- 0mm (.9 in) Disc thickness (Standard) - mm to mm (0. to 0. in) New pad dimensions- 0x0xmm (. x.9 x 0. in) thick No pad wear allowance is provided Total pad area - 0cm (. in ) Minimum pressure for full retraction - bar (9 psi). Maximum pressure- bar (0 psi) 0 *If one of the mounting spacers (Item ) is repositioned between thruster and caliper, thicker discs up to mm can be accommodated. (see scrap view). Braking Force 0 N ( lbf) at coefficientof friction m = 0. Brake torque (Nm) = Braking force (N) x effective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

4 Disc Brake Caliper: Type MUS - Spring Applied, Air Released Stopping and Holding Duties to (. to.9 in) to (. to. in) Air Inlet Port G / [/ BSP] 0 (. in) 0 X 9 (0. in)to Edge of Disc 9 Use M0 Grade Mounting Bolt. Tight Torque Nm (.9 lbf-ft) Bolt not supplied with Caliper Brake Disc (0. in) (. in) 0 (. in) Disc Brake Caliper Assembly Type MUS Notes: Set dimensions X to mm (0. in) with brake ON. This setting corresponds to maximum Braking Force setting. Readjust set screw (item ) when dimension X exceeds 0mm (0.9 in). To avoid damage to thruster diaphragm do not turn the piston rod while adjusting the setscrew. Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 M0 Plain Washer 000 Tension Spring 0009 Grooved Pin Brake Pad Front Cap 09 Rear Cap 09 Diaphragm 009 Thruster Spring Cap 090 Piston Rod 09 Piston Rod Plate 09 Spacer 09 Comression Spring 009 O-Ring Quad Seal Pressure Washer 009 Mx Skt Hd Cap Screw 00 M Light Washer 00 / BSP Nut 000 M Nut 009 Mx Skt Hd Cap Screw 000 M0x0 Hex Hd Screw 00 M0 Full Nut 00 Technical Data MUS: Thruster only Part No. 0(S). Caliper only Part No. 09. Complete assembly (Caliper and thruster) Part No. 09. Weight (complete assembly)-.0kg (.9 lb) Minimum brake disc diameter- 0mm (.9 in) Disc thickness (Standard) - mm (0. in) New pad dimensions- 0x0xmm (.x.9x0. in) thick Brake pad wear allowance - mm (0.0 in) each pad Total pad area - 0cm (.in ) Minimum pressure for full retraction -. bar (90 psi). Maximum pressure- bar (0 psi) Braking Force 00 N ( lbf) at coefficientof friction m = 0. Brake torque (Nm) = Braking force (N) x effective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

5 Disc Brake Caliper: Type MUH - Hand Operated, Spring Applied Handwheel Adjustable (.0 in) 9 to (. to. in) 0 (. in) (. in) to Edge of Disc 0 (0. in) 9 Use M0 Grade Mounting Bolt. Tightening Torque Nm (.9 lbf-ft) Bolt not supplied with Caliper Brake Disc (0. in) Disc Brake Caliper Assembly Type MUH Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 M0 Plain Washer 000 Tension Spring 0009 Grooved Pin Brake Pad Hand Knob 900 Sleeve 90 Push Rod 90 Spring 0009 / BSP Nut 000 Spacer 09 Technical Data MUH: Hand Knob Assembly only Part No. 00. CaJiper only Part No. 09. Complete assembly (Caliper and hand knob assembly) Part No. 09. Weight (complete assembly) -.0kg (. lb) Minimum brake disc diameter- 0mm (.9 in) Disc thickness (Standard) - mm (0. in) New pad dimensions - 0x0xmm (.x.9x0. in) thick Brake pad wear allowance - mm (0.0 in) each pad maximum Total pad area - 0cm (. in ) Braking Force 0 N ( lbf) at coefficientof friction m = 0. Brake torque (Nm) = Braking force (N) x effective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

6 Disc Brake Caliper: Type MU - Air Applied, Spring Released to (.0 to.9 in) 0 to (. to in) 0 Air Inlet Port G / [/ BSP] (. in) 9 (0. in)to Edge of Disc Brake Disc (See Text) (0. in) 9 Use M0 Grade Mounting Bolt. Tightening Torque Nm (.9 lbf-ft) Bolt not supplied with Caliper (. in) 0 (. in) 0 (.9 in) Disc Brake Caliper Assembly Type MU Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 M0 Plain Washer 000 Tension Spring 0009 Grooved Pin Brake Pad Front Cap 099 Rear Cap 000 Diaphragm 00 Comression Spring 000 / BSP Nut 000 Piston Rod Assembly 0099 Spacer 09 Mx Skt Hd Cap Screw 00 9 M Nut Technical Data MU: Thruster only Part No. 0. Caliper only Part No: 09. Complete brake assembly Part No. 09. Weight (complete assembly)-.900kg (.9 lb) Minimum brake disc diameter- 0mm (.9 in) Disc thickness (Standard) - mm (0. in) New pad dimensions- 0x0xmm (.x.9x0. in) thick Brake pad wear allowance - mm (0.0 in) each pad Total pad area - 0cm (. in ) Maximum pressure - bar ( psi) (0) () () () () (0) () () Maximum Pressure bar = psi Nm = 0 lbf-ft bar = psi () () () (9) (9) () () (90) () Braking Torque Nm (ft lb) Volume displacement of thruster at mm (0. in) stroke- ml (. fl oz) Max. volume displacement at 0mm (. in) stroke- 0 ml (. fl oz) The above Braking Torque graph for Type MU Brake is for bedded and conditioned brake pads having a coefficient of friction of 0. when used with Standard Twiflex brake disc materials. Air Pressure - bar (psi) (in) Disc Diameter mm () 0 00 () () (9) () 0 Braking Force bar ( psi) = 0 N ( lbf) Brake torque (Nm) = Braking force (N) x effective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

7 Disc Brake Caliper: Type MUP - Air Applied to (.0 to.9 in) 9 0 (.09 in) (.0 in) (0. in) to Edge of Disc (.9 in) (. in) Air Inlet Port G / [/ BSP] Use M0 Grade Mounting Bolt. Tightening Torque Nm (.9 lbf-ft) Bolt not supplied with Caliper Brake Disc (0. in) Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 009 9/ Plain Washer 0009 Disc Brake Caliper Assembly Type MUP Complete assembly (Caliper and thruster) Part No. 99 M0 Plain Washer 000 Air Thruster 00 9 / x/ Rivet Technical Data MUP: Complete assembly (Caliper and thruster) Part No Weight (complete assembly) kg (. lb) Minimum brake disc diameter -0mm (.9 in) Disc thickness (Standard) - mm (0. in) New pad dimensions- 0x0xmm (.x.9x0.in) thick Brake pad wear allowance - mm (0.0 in) each pad Total pad area - 0cm (.in ) Maximum pressure- bar (0 psi) Volume displacement of thruster at maximum (mm) (0. in) stroke-. ml (0. fl oz) Air Pressure - bar (psi) (in) Disc Diameter mm (0) () () () () (9) () 0 (0) () () () () (0) Maximum Pressure bar = 0 psi Nm = 0 lbf-ft bar = psi () () () (0) () () () (9) () () () (9) Braking Torque Nm (ft lb) Brake Performance of MUP Disc Brake Caliper The ratings shown on the above graph are based on fully bedded-in pads and coefficient of friction of 0. Braking Force bar (0 psi) = 0 N ( lbf) Brake torque (Nm) = Braking force (N)xeffective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

8 Continued from page The MUH disc brake caliper is fitted with a large.plastic hand knob for adjustment of the spring thrust and provides an economic and effective brake for light holding duties or as a tensioning brake where hand setting can give an adequate braking control. The thrust force and consequently the braking force can be varied from zero to 0 N at maximum setting at coefficient of friction µ = 0.. The braking force of 0 N holds for pad wear up to mm (0.0 in) but declines to 0 N at mm (0.0 in) pad wear each pad. The MU is a pneumatically applied, spring released disc brake caliper fitted with a diaphragm type thruster. The braking force available from this caliper decreases slowly from the value in the table (which is for new pads) to 0 N at mm (0.9 in) stroke, equivalent to.mm (0. in) wear per pad. Beyond this point the fall off of braking force is more rapid. The disc brake caliper, type MUP, is the smallest in the Twiflex range. It is a simple air operated direct acting unit without return spring and is supplied fully assembled. Performance of Type MU (Mk ) Disc Brakes: Brake Type Maximum Braking Force Installation: Thrusters should be attached to the caliper arm using the spacers and nuts provided, as shown in the drawings on pages to. The maximum tightening torque is 0 Nm ( lbf-ft). If possible the calipers should be operated using dry, filtered and non-lubricated air. Discs: The preferred material for the manufacture of discs is spheroidal graphite cast iron. Grey iron can be used, but the maximum speed is reduced by one-third. Forged or wrought (not cast) steel having a hardness of 00 HB minimum may also be used. Disc rubbing paths should have a surface finish of µm CLA or better, and be flat and parallel within 0.0mm (0.000 in). A range of standard discs of.mm (0.0 in) thickness is available from Twiflex (Data Sheet DB00) which may be used with MUS and MU brake calipers. Twiflex discs are manufactured to the above limits from spheroidal graphite iron to BS 9 grade 0/. Selection of Type MU (Mk ) Disc Brakes: Minimum Pressure for Full Retraction MUS 00 N ( lbf). bar ( psi) MUS 0 N ( lbf) bar (9 psi) MUS 00 N ( lbf). bar (90 psi) MUH 0 N ( lbf) - MU 0 N ( lbf) - MUP 0 N ( lbf) - Type Caliper Thruster Complete Part No. Part No. Brake Part No. Characteristics and Applications MUS Spring Applied - air released Light duty, stopping and holding MUS Spring applied - air released Holding duties and occasional stopping MUS Spring applied - air released Light duty, stopping and holding MUH Hand operated Holding duties only MU Air applied - spring released Holding and stopping duties MUP Air applied 0* Light duty, holding duties only * Thruster 0 = Thruster 00 plus Fixing RIvets. 9 Briar Road, Twickenham Middlesex TW RB - England + (0) 0 9 Fax: + (0) 0 0 This approval is in Accordance with Certificate number 0 Issue 0 June 009 Twiflex 00. DB00 / Printed in USA

9 TWIFLEXTYPEMU MU Disc Brake Caliper DS000 For MUP only (.9 in) (.99 in) (0. in) to disc edge 0 (.0 in) Disc Thickness (0. in) (. in) (.0 in) 9 (.0 in) Caliper Part Number Weight Pad wear allowance Total pad area Pad dimensions new Pad material 0. kg. (. lb) mm (0.0 in) cm (. in) ( Pads) 0 x 0 x mm thick (. x.9 in x 0. in) Asbestos-free high friction material 0 (. in) (0. in) M0 Mounting bolt (Nm) (.9 ft lb) Bolt not supplied with caliper AVAILABLE SPARES Item Component Part No. Arm Assembly - Thruster 0 Arm Assembly - Slotted 0 Pivot Post 009 Pad Retaining Spring 0009 Tension Spring 0009 Brake Pad (. in) Twiflex Disc Brakes must be used with Twiflex asbestos free brake pads. The use of any other brake pads will invalidate the warranty. Twiflex Limted reserves the right to modify or change the design without prior notice.

10 MU Disc Brake Caliper General Description The MU series of disc brake calipers are the smallest in the Twiflex range and are designed for light duty stopping and holding applications. This range of brake calipers can be used used with mm (0. in) or.mm (0.0 in) thick discs. Normally one or two units will be used per disc but the number may be increased, depending on disc size. The brake units can be positioned at any angle around the periphery of the disc, but ideally they should be mounted horizontally ( in or 9 o clock positions ) in relation to the disc. Brake Description Data Sheet Maximum Braking Force - kn (lbf) MU Pneumatically applied - Spring released 00. () MUP Pneumatically applied - Spring released () MUS Spring applied - pneumatically released () MUS Spring applied - pneumatically released () MUS Spring applied - pneumatically released 00. () MUH Mechanically applied - Hand operated () Discs: A range of standard discs of.mm (0. in) thick are available from Twiflex see Data Sheet DS00. Minimum disc diameter for the MU caliper is 0mm (.9 in) Controllers: Standard Twiflex Controllers are available for single or multi-caliper installations for use with electric, pneumatic and hydraulic signalling systems. Pad replacement in air applied calipers: To replace the pads, secure the installation to ensure safety. With the aid of a pair of pliers, pull the pad retaining spring from one end of the pad, detach the spring completely from the pad and remove the pad from the arm. Remove the second pad from the other arm. Clean the disc and pad recesses in the arms with a suitable cleaning agent such as white spirit. Place a new pad into the recess in one arm, engage one end of the pad retaining spring to the pad, and ease the spring apart with pliers and fit the spring, ensuring that the spring also locates into the slot in the arm. Fit the second pad to the other arm. Manually rotate the pads in the arm recesses so the pad friction faces are parallel to the disc surface at the point of engagement. Pad replacement in spring applied calipers: To replace the pads, secure the installation to ensure safety. Slacken the two locknuts holding the thruster, and screw back the push rod to create space between pad and disc. With the aid of a pair of pliers, pull the pad retaining spring from one end of the pad, detach the spring completely from the pad and remove the pad from the arm. Remove the second pad from the other arm. Clean the disc and pad recesses in the arms with a suitable cleaning agent such as white spirit. Place a new pad into the recess in one arm, engage one end of the pad retaining spring to the pad, and ease the spring apart with pliers and fit the spring, ensuring that the spring also locates into the slot in the arm. Fit the second pad to the other arm. Refit the thruster as described in the relevant data sheet. Manually rotate the pads in the arm recesses so the pad friction faces are parallel to the disc surface at the point of engagement. For bedding-in and conditioning procedures see publication M00 Health and Safety data sheet refer to DS Briar Road, Twickenham Middlesex TW RB - England + (0) 0 9 Fax: + (0) 0 0 This approval is in Accordance with Certificate number 0 Issue 0 June 009 Twiflex 00. DS000 / Printed in USA

11 MUS Disc Brake Caliper - Spring applied Pneumatically released Nominal diamemsions given For caliper dimensions see DS000 Air Inlet Port Rp/ (/" BSP) Ø DS00 to Disc Edge Brake Disc 9 to to 0 0 Disc Diameter mm Air Pressure - bar Weight (caliper and thruster) -.kg (thruster only) - 0.kg Minimum pressure for full retraction. bar Maximum Braking Force = 00N Braking Torque - Nm The ratings shown on the above graph are based on fully bedded and conditioned brake pads with nominal frictioncoefficient μ= 0.. For bedding-in and conditioning procedures see Publication M00. Braking Force is defined as the Tangential Force acting on the brake disc at the Effective Disc Radius. Braking Torque (Nm) = Braking Force (N) x Effective Disc Radius (m)where Effective Disc Radius = Actual Disc Radius Twiflex Disc Brakes must be used with Twiflex asbestos free brake pads.the use of any other brake pads will invalidate the warranty. Twiflex Limited reserves the right to modify or change the design without prior notice. 9 Briar Road, Twickenham Middlesex TW RB - England + (0) 0 9 Fax: + (0) 0 0 This approval is in Accordance with Certificate number 0 Issue 0 June 009 Twiflex 00. DS00 / Printed in USA

12 MU Disc Brake Caliper - Pneumatically applied Spring released Air Inlet G/(/ BSP) 'A' A/F.9 G/. 'A' Max Stroke SECTION 'A' - 'A' 0 Dia Thruster Part Number 009 AVAILABLE SPARES Item Component Part No. Diaphragm Kit 909 Piston Rod Assembly 0099 This range of pneumatically operated brakes uses dry and filtered compressed air at pressures up to bar Pneumatic brakes require a control valve which may be operated either manually, or by pneumatic or electrical signal Should it become necessary to replace a diaphragm, ensure air supply is disconnected, remove the M fixing screws and the rear cap of the thruster. Remove the worn diaphragm; clean-up the contactingsurfaces and re-assemble with the new diaphragm and fixing screws in position.. Offer thruster to caliper makinging sure that both lock nuts are removed before placing push rod through caliper arm. Fit Packing washer and spacer (see fig and below. Fit lock nuts over the push rod. Tighten one lock nut to 0-0 Nm then tighten the second nut against the first Caliper Arms Caliper Arms Push Rod Locknuts Packing washer Spacer Thruster Fig. Assembly for mm disc Push Rod Locknuts Packing washer Spacer Thruster Fig. Assembly for.mm disc 9 Briar Road, Twickenham Middlesex TW RB - England + (0) 0 9 Fax: + (0) 0 0 This approval is in Accordance with Certificate number 0 Issue 0 June 009 Twiflex 00. DS00 / Printed in USA