GB2200700A

GB2200700A - Mounting motor cycle anti-lock hydraulic modulator unit

Info

Publication number: GB2200700A
Application number: GB08802184A
Authority: GB
Inventors: Robert Gregory Fuller
Original assignee: Lucas Industries Ltd
Current assignee: ZF International UK Ltd
Priority date: 1987-02-03
Filing date: 1988-02-01
Publication date: 1988-08-10
Anticipated expiration: 2008-02-01
Also published as: GB2200700B; GB8702342D0; US4880075A; JPS63128165U; GB8802184D0

Description

700 ' 0 0 t 1 v 1 IMPROVEMENTS IN ANTI-LOCK HYDRAULIC MODULATOR UNITS FOR

VEHICLES This invention relates to anti-lock hydraulic modulator units for vehicles of the kind for modulating the supply of hydraulic fluid from a master cylinder to a wheel brake and comprising a housing incorporating a wheel angular speed sensor of the inertia'type, a dump valve, and a hydraulic pump for re-applying the brake automatically during a given brake-applying cycle after the brake pressure has first been relieved by 'operation of the dump valve by the sensor. More particularly the present invention is concerned with improved. means for installing a modulator unit of the kind set forth in a motor cycle adjacent to a wheel from which the unit is adapted to be driven.

It is known from GB-A-2160602 to install an hydraulic modulator unit of the kind set forth in a motor cycle with the unit driven from the front wheel. In- one of the installations described the wheel hub is modified to include an axially extending radial wall defining a recess which is closed by an annular rim extending axially from a panel fixed to the axle, and the panel forms a mounting for the modulator unit. - The modulator unit is driven from the wheel through a belt drive from pulley which is rotatable on a bearing mounted on a central boss, with the pulley, in turn, being driven from the wheel through a dog joint.

A specially constructed wheel must be provided for the installation disclosed in GB-A-2160602. In -iculty would be experienced in providing addition difl. an effective seal between the rotating radial wall and the relatively stationary rim in order to prevent the 2 recess from filling with dirt and other material which might affect operation of the drive to the unit.

According to our invention an anti-lock modulator unit is carried by a plate which is adapted to be mounted on one end of a non-rotatable axle upon which a wheel having a hub is journalled for rotation, and a casing extending axially and radially inwards from the outer peripheral edge of the plate is adapted to seal at its inner edge against the external surface of the hub of the wheel.

A recess defined by the interior of the casing and the plate is therefore effectively sealed from the ingress of dirt and other material to provide a convenient space in which transmission means for the unit can be installed i,, a fully protected manner.

Preferably the plate has an axially extending boss which is adapted to encircle the axle and provides a mounting for a drive pinion provided with drive means for co-operation with complementary drive means on the hub.

Thus to install the unit in a motor cycle the wheel hub requires a. small modification to provide it with the drive means and a f ace for sealing engagement by the seal.

Conveniently bearing mounted modulator unit, co-operating with the unit, or by drive and driven 1 S the drive pinion is rotatable on a on the boss, and may drive the either through a belt drive a driven pinion on a drive shaft for the direct co- operation by the two pinions in an installation in which j 1 3 the diameter of the drive pinion is increased substantially.

Two embodiments -of our invention are illustrated in the accompanying drawings in which:- Figure 1 is a side elevation of a front wheel of a motor cycle including the lower end of the forks and showing an anti-lock modulator unit; Figure 2 is Figure 1; and a section on the line 2-2 of Figure 3 is a view similar to Figure 2 but showing a modification.

The portion of the motor cycle illustrated in Figures 1 and 2 of the accompanying drawings shows a front wheel 1 having a hub 2 journalled for rotation on spaced bearings 3, 4 which are mounted on a stationary axle 5. Opposite ends of the axle 5 are received in the lower ends of the front forks 6, 7 of the motor cycle and the axle 5 is secured in position by means of a nut 8 at one end. Release of the nut 8 then enables the wheel 5 tobe dropped down out of the forks.

A pair of annular brake discs 9, 10 are mounted on opposite sides of the wheel 1. A illustrated each disc 9, 10 is carried from its inner peripheral edge by a respective imperforate mounting flange 11, 12 generally of bell-shaped outline. The inner edges of the flanges 11, 12 are clamped against opposite faces of the wheel 1 by at least two nut and bolt clamp assemblies 13, 14.

4 A modulator unit 20 of known construction is mounted adjacent to the f ork 7. The unit 20 comprises a housing 21 in which a drive shaft 22 is journalled for rotation. The drive shaft 22 drives a wheel angular speed sensor 23 of the flywheel type and an hydraulic pump 25. The sensor 23 operates a dump valve 24 for controlling the supply of fluid from a master cylinder to a brake, and dumping it to a reservoir for fluid to correct a wheel lock, and the io pump 25 is operative to re-apply the brake automatically in a common braking cycle, after the wheel lock has been corrected.

The housing 21 is bolted to a circular mounting plate 26 with the drive shaft 22 parallel to the axle 5 and with the housing 21 projecting outwardly beyond the fork 7. The plate 26 has an eccentrically arranged boss 27 which encircles the adjacent end of the axle 5 and at its inner end is clamped against the bearing 4 by the nut 8.

The outer peripheral edge of the plate 26 is received within a casing 28 of generally bell-shaped outline, of which the inner peripheral edge carries an annular seal 29 in which a complementary face 30 on the hub 2 is rotatable.

A drive pinion 31 is journalled for rotation on a bearing 32 mounted on the boss 27, and the pinion 31 is driven from the adjacent end of the hub 2 by the engagement of complementary dogs 33, 34 in the two components.

The outer end of the drive shaft 22 of the unit 20 extends into a recess defined between the plate 26 and the casing 28 and carries a driven pinion 35. The It 1 111 Cl pinion 35, and in consequence the unit 20, is driven f rom the wheel 1 through the drive pinion 31 through a toothed endless belt 36 which encircles both pinions 31 And 35.

The pinions 31 and 35 and the belt 36 are enclosed within the casing 28 and are therefore protected from dirt and similar material.

The wheel 1 is a standard component but which requires a slight modification to provide the face 30 for the seal 29 and the drive dogs 34.

The modulator unit 20, the mounting plate 26, the pinions 31 and 35, the belt 36, and the casing-28 constitute an assembly which can be mounted on the wheel 1 simply by sliding the boss 27 onto the axle 5 to cause the dogs 33 and 34 to engage. The assembly is then clamped in position by screwing the nut 8 onto the end of the axle, in turn to clamp the boss 27 against the bearing 4.

The. assembly can be easily removed from the motor cycle, for maintenance or replacement, by. the reverse procedure of simply removing the nut 8 which enables the assembly then to be withdrawn from the axle.

Mounting the pinions on a common plate 26 has the advantage that the correct tension is maintained in the belt 36 when the plate 26 and the unit 20 are removed as a- single assembly, for example upon removal of the wheel 5.

In the modified construction illustrated in Figure 3 of the drawings the mounting plate 26 and the housing 21 are formed integrally as a single 1 6 1 component. The belt 36 is omitted, and the diameters of the pinion 31 and 35 are increased and so that the pinions 31 and 35 are adapted for direct meshing engagement with each other.

C The construction, operation, and installation of the unit shown in Figure 3 is otherwise the same as that of Figures 1 and 2, and corresponding reference numerals have been applied to corresponding parts.

?i 1 1 j 1 7

Claims

1. Means f or installing a modulator unit in a motor cycle adjacent to a wheel from which the unit is adapted to be driven, in which the unit is carried by a plate which is adapted to be mounted on one end of a non-rotatable axle upon which a wheel having a hub is Journalled for rotation, and a casing extending axially and radially inwards from the outer peripheral edge of the plate is adapted to seal at its inner edge against the external surface of the hub of the wheel.

2. means as claimed in claim 1, in which the said inner edge of the plate carries an annular seal in is which a complementary f ace on the hub is adapted to be rotatably received.

3. Means as claimed in claim 1 or claim 2, in which the plate has an axially extending boss which adapted to encircle the axle and provides a mounting for a drive pinion provided with drive means for co-operation with complementary drive means on the hub.

4. Means as claimed in claim 3, in which the drive pinion is rotatable on a bearing on the boss.-

5. Means as claimed in claim 3 or claim 4, in which the modulator unit is adapted, to be driven by a driven pinion mounted on a drive shaft for the unit. and the drive pinion is adapted to drive the modulator unit through a belt drive co-operating with the driven pinion.

6. Means as claimed in claim 3 or claim 4, in which the modulator unit is adapted to be driven by a driven 1 R - 8 pinion mounted on a drive shaf t f or the unit, and the modulator unit is adapted to be driven by the direct co-operation of the drive pinion and the driven pinion.

7. Means as claimed in any of Claims 3-6, in which the modulator, the plate, and the casing comprise an assembly adapted to be removably mounted on the wheel, the boss being slidable onto the axle to cause engagement of the drive means on the pinion with the drive means on the hub, in combination with detachable means co-operating with the axle to clamp the boss against a stop face on the axle.

8. Means as claimed in Claim 7, in which the detachable means, comprises a nut which is screwed onto the axle

9. In combination: a motor cycle front wheel assembly comprising a front wheel having a hub journalled for rotation on spaced bearings on a stationary axle, and an anti-lock modulator unit of the kind set forth, in which the unit is installed in the motor cycle adjacent to the front wheel by means as claimed in any preceding claim.

10. Means for installing a modulator unit of the kind set forth in a motor cycle substantially as described herein with reference to and as illustrated in Figures 1 and 2 of the accompanying drawings.

11. Means for installing a modulator unit of the kind set forth in a motor cycle substantially as described herein with reference to and as illustrated in Figures 1 and 3 of the accompanying drawings.

1 1 9

12. The combination as claimed in claim 9, and substantially as described herein with reference to and as illustrated in Figures 1 and 2 of the accompanying drawings.

13. The combination a-s claimed in claim 9, and substantially as described herein with reference to and as illustrated in Figures 1 and 3 of the accompanying drawings.

Pubhshed 1988 at The Patent Office. STate House. 6671 High Holborz, London WCIR 4TP. Purtlier copies may be obts=iedd from Th patent OMce. Sales Branch. St Ma--y Cray. Orpington, Kent BRS 3RD. Printed by Multiplex techniques ltd. St Mary Cray, Kent Con. 1187.