EP0006764A1 - A method and apparatus for grinding vehicle brake discs - Google Patents
A method and apparatus for grinding vehicle brake discs Download PDFInfo
- Publication number
- EP0006764A1 EP0006764A1 EP79301271A EP79301271A EP0006764A1 EP 0006764 A1 EP0006764 A1 EP 0006764A1 EP 79301271 A EP79301271 A EP 79301271A EP 79301271 A EP79301271 A EP 79301271A EP 0006764 A1 EP0006764 A1 EP 0006764A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- disc
- abrading
- discs
- face
- brake
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/10—Single-purpose machines or devices
- B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
- B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/08—Portable grinding machines designed for fastening on workpieces or other parts of particular section, e.g. for grinding commutators
Definitions
- This invention relates to a method of grinding brake discs and to a machine for the regrinding of brake discs which form a portion of disc brakes.
- Disc brakes are widely used on motor vehilces, particularly automobiles.
- Generally such brakes have a disc attached to the vehicle wheel to be breaked, and brake shoes which approach the opposite sides of the disc when braking is desired, and engage the disc, whereby to slow the wheel through friction.
- the brake shoes suitably have brake linings of asbestos or other high-friction material, whereas the disc itself is usually a suitable metal, which will dissipate the heat of friction rapidly and which will be sturdy during operation.
- brake discs frequently become contaminated by such material as oil and grease, or they may become rusty. Oil and grease reduce the friction between the brake shoes and the disc, and may cause the brakes to fail to function when they are needed. Rust, on the other hand, may increase the friction, causing the brake to seize or "grab".
- the regrinding of brake discs is done in machine tools, which require the brake discs to be removed from the vehicle for the regrinding process.
- Some devices require the further disassembly of the disc from the wheel hub with which it is associated, whereas others, such as, for example, that shown in Canadian Patent 815,782 issued June 24, 1969 to Ammco Tools Inc., permit the disc to be reground while still attached to the wheel hub, after the wheel hub is removed from the vehicle.
- Some devices such as that shown in Canadian Patent 865,769 of FMC Corp. require a two-stage process, which ' a first turning step on a lathe and a second, grinding step.
- the present invention relates to a method for refinishing discs, and an apparatus for carrying out that method, whereby a smooth, uniform finish on such discs is obtained.
- the invention also has the advantage that, if desired, the discs can be reground while they are still in position on the vehicle.
- the invention provides a method for regrinding a vehicle brake disc comprising the steps of rotating the brake disc about a first axis and placing two opposed abrading discs each having an abrading face so that the said abrading face is in frictional face-to-face contact with a face of the vehicle brake disc to be reground; each abrading disc being rotatable about an axis of rotation parallel to said first axis, and fixedly oriented perpendicular to said abrasive face.
- the invention can of course be used to grind brake discs which have been removed from the vehicle and mounted on a suitable support, it is particularly suited to grinding dics in situ on a vehicle, where there is sufficient space around the brake disc in situ to place the apparatus. Use in this way vaoids the necessity of dismounting the vehicle wheel, with an attendant time saving.
- the invention also comprises apparatus for use in grinding brake discs, including two rigid abrading discs with abrading faces in face-to-face relation and movable towards and away from one another, each disc being mounted for rotation about an associated axle, each axle being perpendicular to the abrading face of its disc, means for positioning the abrading discs with their abrading faces in face-to-face contact with a brake disc placed between them, and means for holding the abrading discs when so positioned, in frictional contact with the brake disc.
- the means for positioning the abrading discs includes a mounting bracket which attaches to the brake caliper mounting bracker of a motor vehicle.
- the apparatus according to the invention is used in conjunction with a means for powering the vehicle wheel on which the disc brake is mounted.
- the powering device can be an electric motor, which is attached to a mounting device boltable to a vehicle wheel such that the motor drives the wheel.
- the wheel on which the disc brake is located is itself a powered wheel, as for example a wheel driven by the vehicle engine, then it is within the scope of the invention (although not preferred) to use the vehicle engine to power that wheel.
- the abrading disc is not powered, but is merely caused to rotate by the rotation of the vehicle wheel and its associated brake disc in contact with the abrading disc during operation.
- the vehicle axle is generally shown at 1.
- the axle has attached to the end of it, as by bolts in conventional fashion, a brake disc 2 and a wheel hub 3.
- the wheel hub has extending from it a plurality of wheel studs 4.
- a bracket 5, secured to the frame of the automobile, is provided for the mounting of brake calipers (which are not shown).
- the inventive device is shown generally at 10. As shown, it has an attachment member 11, which is provided with two holes 12 and 13. These holes fit over the caliper-mounting studs 7 and 8, which extend outward from the caliper-mounting bracket 5.
- a connecting member 14 which is rigidly secured, as by welding, to the attachment member 11.
- a base member 15 Near the end of member 14 remote from member 11, is attached a base member 15.
- member 15 is shown as being slidably mounted on member 14, by means of a sleeve 16 which is rigidly connected thereto and which slides on member 14.
- a set screw 17, having a handle as shown at 18, attached to it is provided to lock sleeve 16 into position at a desired position on vertical member 14.
- the member 15 has two sleeves 19 and 20 slidable independently on it. Each of these sleeves bears a grinder supporting member, the two members being respectively designated as 21 and 22.
- a threaded rod 23 is permanently secured, as by welding or by bolting, to member 21, and passes through member 22 by a suitable hole 24.
- An internally-threaded sleeve 25 (shown partially cut- away) having a mating thread to rod 23 is screwed over rod 23.
- the internally-threaded sleeve has a handle 26 for adjustment attached to one end.
- each of the supporting members 21 and 22 is located a hole containing a low friction bushing or ball bearing assembly.
- These bushings or bearing assemblies are shown as 30 and 31 in the drawings.
- a stub axle shown respectively as 32 and 33.
- Each stub axle has mounted on it a metal disc (respectively shown as 34 and 35) which is fixed to the axle for rotation therewith.
- the discs are coated with abrasives as indicated at 36 and 37.
- 36 and 37 are shown as abrasive coatings fixed permanently to the discs 34 and 35, it is of course possible to have the abrasives mounted on removable pads, which can be replaced when the abrasive becomes worn.
- the two axles 32 and 33 are shown as having the same axis which is shown by number 40-40'. It will be noted that this axis lies outside the periphery of the wheel disc 2. It is not necessary that the two axles have the same axis, although they must be parallel to each other, and, they should be parallel, when the apparatus is in operating position, to the axis 6-6' of the vehicle wheel and axle. It is also important that when the device is operating, the axes of both of the axles 32 and 33 should lie outside the periphery of the wheel disc 2, if discs 34 and 35 are not powered, as will be discussed.
- bearings 41 and 42 are provided on the upper ends of upstanding members 21 and 22.
- these bearings are rotatable wheels, of any suitable material, which bear on the back of discs 34 and 35 respectively, to prevent each disc from bending backwards towards its associated supporting member 21 or 22.
- the bearings 41 and 42 are journalled on the top of members 21 and 22 by a low-friction mounting, such as, for example, a ball bearing assembly shown generally at 43 and 44.
- the caliper-mounting bracket is a vertically-oriented crescent shaped piece of metal positioned just to the rear of the axle supporting the wheel with which it is associated, having its mid-point approximately at the level of the axle.
- the caliper-mounting bracket 5 illustrated in the drawings is of this type. With such an arrangement the member 11 is oriented approximately vertically, with the member 14 being oriented horiztonally and extending rearwardly from the mounting bracket.
- the invention can be used with any shape of mounting bracket, merely by modifying member 11 to attach to that bracket. In some cases it may be convenient to hang the apparatus from the mounting bracket so that member 14 depends vertically downward, and member 15 extends horiztonally under the wheel disc.
- the precise orientation and form of these members is not important to the invention, provided that the discs 34 and 35 can be positioned as described with respect to the wheel disc 2.
- the apparatus (generally indicated as 10a) is shown mounted on a wheeled dolley 50, which has wheels 51.
- a vertical member 14a connects the apparatus to the dolley.
- all other parts of the apparatus are as previously described, except that the threaded rod 23 and handle 26 are reversed from their position as shown in Figure 1, and the positions of members 22 and 21 are interchanged. The reason for this reversal is so that handle 26 will be accessible when the inventive apparatus generally indicated as 10a extends under a vehicle.
- a suitable frame 52 which supports a motor (as for example an electric motor) 53.
- the motor-power take-off 54 is connected to a pulley 55, which is connected through a belt 56 to a second pulley 57 mounted on rotatable member 60, journalled for rotation in a member 66.
- the entire motor, belt and pulleys are joined together by a rigid frame 65, which slides on frame 52 and is adjustable in its height by handle 59, which is attached to a threaded mating portion of an upstanding member 58 which permits the member to be lengthened. This permits the level of the motor, the two pulleys and the belt above the ground to be varied.
- a second power take-off 61 On member 60 is a second power take-off 61. This is preferably a universal take-off. It is provided, as is shown in Figure 4 with a flange having a plurality of holes 62. These holes are designed to engage wheel studs, and may be slotted, as shown in Figure 4, so that they can accommodate the wheel studs of several different types of vehicles and so that they also have, to some extent, a self-centering feature.
- the apparatus 10 is then attached to the caliper-mounting bracket 5, as by fitting holes 12 and 13 over the caliper-mounting studs.
- the member 11 can be bolted to the studs, but this is usually not necessary and it is more convenient, having regard to the difficulty of working under a vehicle, merely to hang the member 11 from the holes.
- the set screw 18 and the handle 26 are operated so that the two abrasive discs are positioned on opposite sides of the disc to be ground, with the abrasive faces 36 and 37 facing the disc.
- the axis 40 is positioned to be outside the periphery of the disc.
- this axis is shown as beside the disc, but it is evident that it could be slightly outside the periphery but below or above the disc 2, rather than beside it, if there is sufficient space to mount the apparatus in that orientation.
- the distance from the axis to the periphery of the disc depends on how much overlap is desired between the abrasive pads 36 and 37 and the disc, which in turn governs how much of the disc will be reground.
- the handle 26 is then operated so that the two members 21 and 22 are moved toward each other. This is continued until the two faces 36 and 37 are in tight frictional engagement with the disc 2 to be reground.
- the wheel 3 and the associated disc 2 are rotated.
- this may be done by actuating the vehicle engine.
- this will not be feasiable.
- One suitable arrangement is that shown in Figure 3 where motor 53 drives, power take-off 61.
- the handle 59 is adjusted until take-off 60 is at the height of the axle 6 and facing the outside-of wheel 3.
- the slots 62 are fitted over wheel studs 4, and bolts are attached to ensure that the wheel studs remain in position.
- motor 53 is actuated, causing wheel 3 and disc 2 to rotate.
- the abrasive surfaces abrade the opposed faces of wheel disc 2.
- the effect of the rotatory motion of the abrasive discs, and of the wheel disc 2 provides a smooth uniform grinding of the disc surfaces.
- an initial grinding can be done with discs 34 and 35 having abrasive coatings 36 and 37 which have a coarse abrasive, followed by a second grinding operation, replacing those discs with discs having finer abrasive coating.
- apparatus 10a it is not absolutely necessary, in all cases, tp remove the calipers before grinding a disc. However, the,calipers will usually be removed, to give the operator more room in which to work while placing his abrasive discs in position around the wheel disc.
- the axes of the two axes 32 and 33 need not be the same. It may occur, for example, that it is desired to regrind a larger area on one side of a wheel disc than on the other side. In such a case, a larger disc 34 (for example) than disc 35 would be provided. While it is possible to have the two discs having the same axis 40-40', it may be convenient to have the larger disc have a different axis of rotation than the smaller disc. This is still within the scope of the invention.
- abrading discs 35 and 34 have been shown in the drawings as unpowered, and caused to rotate through their frictional contact with disc 2, it is within the scope of the invention to power such abrading discs. Powering such discs may be advisable where a very polished finish is desired . to the disc 2, as the abrading discs can then be caused to rotate at a higher speed than the disc 2, and, when used with very fine abrasive, this will result in a highly polished finish.
- the arrangement 10 rather than the arrangement 10a, as it is found to be more convenient to mount the disc grinding apparatus on the caliper-mounting bracket, rather than having it mounted permanently on a dolley.
- different motor vehicles have different caliper-mounting brackets, and it is therefore advisable to have the option of placing the device on a dolley, as shown in Figure 3, in cases where the holes 12 and 13 do not correspond with the studs on the caliper mounting bracket of the particular vehicle on which grinding of the brake discs is to take place.
- the arrangement 10a can be used.
- the adapter 61 is replaced by a suitable mounting for the brake disc for rotation by the motor 53, through shaft 60; and the apparatus 10a is brought into contact with the sides of the brake disc as described for grinding.
- brake discs which are to be resurfaced have been worn unevenly.
- the brake disc is thinner, by reason of wear, closer to the centre than it is at the periphery. In other instances, the brake disc is thinner at the periphery than it is at the centre.
- the orienting of the abrading discs about axes which are slightly off-parallel also permits the use of conventional thrust bearings, mounted about axles 32,33, to replace bearings 41 and 42 in order to keep the abrading discs in position.
- the two abrading discs are adjusted so that their axes of rotation are slightly off-parallel, with the portions of the abradings discs which will engage the brake disc being closer than the portions which will not engage the brake disc.
- the portions of the abrading discs 34 and 35 closest to the wheel 3 would be arranged to be closer together than the portions closest to the member 15.
- the two abrading discs are then locked tightly against the brake disc to be ground, and the slightly non-parallel arrangement of the axes of rotation puts pressure on the thrust bearings, so that they do not wobble during the grinding operation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
- This invention relates to a method of grinding brake discs and to a machine for the regrinding of brake discs which form a portion of disc brakes.
- Disc brakes are widely used on motor vehilces, particularly automobiles. Generally such brakes have a disc attached to the vehicle wheel to be breaked, and brake shoes which approach the opposite sides of the disc when braking is desired, and engage the disc, whereby to slow the wheel through friction. The brake shoes suitably have brake linings of asbestos or other high-friction material, whereas the disc itself is usually a suitable metal, which will dissipate the heat of friction rapidly and which will be sturdy during operation.
- During the operation of a motor vehicle, brake discs frequently become contaminated by such material as oil and grease, or they may become rusty. Oil and grease reduce the friction between the brake shoes and the disc, and may cause the brakes to fail to function when they are needed. Rust, on the other hand, may increase the friction, causing the brake to seize or "grab".
- In order to remove rust and contamination, and assure that the disc surface is smooth so as to be suitable for gripping the brake shoes, regrinding of brakes discs is often necessary. Thus, a large industry has developed to regrind brake discs. '
- Generally, the regrinding of brake discs is done in machine tools, which require the brake discs to be removed from the vehicle for the regrinding process. Some devices require the further disassembly of the disc from the wheel hub with which it is associated, whereas others, such as, for example, that shown in Canadian Patent 815,782 issued June 24, 1969 to Ammco Tools Inc., permit the disc to be reground while still attached to the wheel hub, after the wheel hub is removed from the vehicle. Some devices such as that shown in Canadian Patent 865,769 of FMC Corp. require a two-stage process, which ' a first turning step on a lathe and a second, grinding step. In that patent a free-rotating grinding wheel, mounted on a universal mounting, is used to finish the surface of a disc after grinding. Such devices are frequently very expensive, and require a high capital investment by shops wishing to use them. Additionally, the time taken to disassemble the wheel from the vehicle prior to regrinding leads to delay and high cost for the regrinding operation.
- Because of the disadvantages of requiring disassembly of the wheel from the vehicle, several attempts have been made to develop a machine which would regrind the wheel discs while they are still in place on a vehicle. West German Published Patent Application 2,316,672 of the present inventor, which was published on March 28, 1974,shows one such proposal. Another generally similar proposal is shown in U. S. Patents 3,521,411 and 3,590,537 of Hennig and Kammermayer.
- Experience with devices such as those shown in the German Published Application and U. S. Patents discussed above has shown that these devices are not fully satisfactory for the regrinding of brake discs. In particular, discs reground with such devices frequently exhibit scoring of the disc surface, which may at times be so severe as to render the disc useless. Even when extensive scoring is not present, the discs do not exhibit the same smoothness and uniformity of finish as is available from factory-finishing or refinishing.
- The present invention relates to a method for refinishing discs, and an apparatus for carrying out that method, whereby a smooth, uniform finish on such discs is obtained. The invention also has the advantage that, if desired, the discs can be reground while they are still in position on the vehicle.
- Accordingly, the invention provides a method for regrinding a vehicle brake disc comprising the steps of rotating the brake disc about a first axis and placing two opposed abrading discs each having an abrading face so that the said abrading face is in frictional face-to-face contact with a face of the vehicle brake disc to be reground; each abrading disc being rotatable about an axis of rotation parallel to said first axis, and fixedly oriented perpendicular to said abrasive face.
- While the invention can of course be used to grind brake discs which have been removed from the vehicle and mounted on a suitable support, it is particularly suited to grinding dics in situ on a vehicle, where there is sufficient space around the brake disc in situ to place the apparatus. Use in this way vaoids the necessity of dismounting the vehicle wheel, with an attendant time saving.
- The invention also comprises apparatus for use in grinding brake discs, including two rigid abrading discs with abrading faces in face-to-face relation and movable towards and away from one another, each disc being mounted for rotation about an associated axle, each axle being perpendicular to the abrading face of its disc, means for positioning the abrading discs with their abrading faces in face-to-face contact with a brake disc placed between them, and means for holding the abrading discs when so positioned, in frictional contact with the brake disc. In the preferred embodiment, the means for positioning the abrading discs includes a mounting bracket which attaches to the brake caliper mounting bracker of a motor vehicle.
- Preferably, the apparatus according to the invention is used in conjunction with a means for powering the vehicle wheel on which the disc brake is mounted. Suitably, the powering device can be an electric motor, which is attached to a mounting device boltable to a vehicle wheel such that the motor drives the wheel. However, in cases where the wheel on which the disc brake is located is itself a powered wheel, as for example a wheel driven by the vehicle engine, then it is within the scope of the invention (although not preferred) to use the vehicle engine to power that wheel. Preferably, the abrading disc is not powered, but is merely caused to rotate by the rotation of the vehicle wheel and its associated brake disc in contact with the abrading disc during operation. However, it is within the scope of the invention, if desired, to power the abrading disc as well.
- The invention will now be disclosed further by the description of the particular embodiments and illustrated by drawings.
- In the drawings:
- Figure 1 shows a view, as seen looking upwardly from below an automobile, showing a vehicle wheel and brake disc, with a device according to the present invention mounted thereon for grinding the disc.
- Figure 2 is a side view, along the line 2-2 of Figure 1.
- Figure 3 shows a suitable apparatus for powering a vehicle wheel in order to cause it to rotate while the grinding operation is taking place, and in addition, an alternate way of mounting the grinding apparatus.
- Figure 4 shows a detail of Figure 3 in cross-section, as indicated by the lines 4-4 on Figure 3, with the detail being shown in greatly enlarged scale.
- The presently preferred embodiment of the invention is the one which is shown in Figures 1 and 2. The preferred embodiment will now be described.
- In Figure 1, the vehicle axle is generally shown at 1. The axle has attached to the end of it, as by bolts in conventional fashion, a
brake disc 2 and awheel hub 3. The wheel hub has extending from it a plurality ofwheel studs 4. A bracket 5, secured to the frame of the automobile, is provided for the mounting of brake calipers (which are not shown). - In Figure 1, the axis of rotation of the axle 1,
disc 2 andwheel 3, all of which rotate as a unit, is shown at 6-6'. - The inventive device is shown generally at 10. As shown, it has an attachment member 11, which is provided with two
holes - Extending at right angles from attachment member 11 is a connecting
member 14, which is rigidly secured, as by welding, to the attachment member 11. Near the end ofmember 14 remote from member 11, is attached abase member 15. In the figures,member 15 is shown as being slidably mounted onmember 14, by means of asleeve 16 which is rigidly connected thereto and which slides onmember 14. Aset screw 17, having a handle as shown at 18, attached to it is provided to locksleeve 16 into position at a desired position onvertical member 14. Themember 15 has twosleeves rod 23 is permanently secured, as by welding or by bolting, tomember 21, and passes throughmember 22 by a suitable hole 24. - An internally-threaded sleeve 25 (shown partially cut- away) having a mating thread to
rod 23 is screwed overrod 23. Suitably, the internally-threaded sleeve has ahandle 26 for adjustment attached to one end. - In each of the supporting
members discs - In the drawings, the two
axles wheel disc 2. It is not necessary that the two axles have the same axis, although they must be parallel to each other, and, they should be parallel, when the apparatus is in operating position, to the axis 6-6' of the vehicle wheel and axle. It is also important that when the device is operating, the axes of both of theaxles wheel disc 2, ifdiscs - To support the
discs bearings upstanding members discs member bearings members - In many present day automobiles, the caliper-mounting bracket is a vertically-oriented crescent shaped piece of metal positioned just to the rear of the axle supporting the wheel with which it is associated, having its mid-point approximately at the level of the axle. The caliper-mounting bracket 5 illustrated in the drawings is of this type. With such an arrangement the member 11 is oriented approximately vertically, with the
member 14 being oriented horiztonally and extending rearwardly from the mounting bracket. However, it will be appreciated that the invention can be used with any shape of mounting bracket, merely by modifying member 11 to attach to that bracket. In some cases it may be convenient to hang the apparatus from the mounting bracket so thatmember 14 depends vertically downward, andmember 15 extends horiztonally under the wheel disc. The precise orientation and form of these members is not important to the invention, provided that thediscs wheel disc 2. - In Figures 3 and 4, another form of the apparatus according to the invention is shown. In these figures, like parts to those previously described are identified by the same number as those parts previously described.
- In Figures 3 and 4, the apparatus (generally indicated as 10a) is shown mounted on a
wheeled dolley 50, which haswheels 51. A vertical member 14a connects the apparatus to the dolley. In the embodiment shown, all other parts of the apparatus are as previously described, except that the threadedrod 23 and handle 26 are reversed from their position as shown in Figure 1, and the positions ofmembers - Also mounted on the
dolley 50 is asuitable frame 52, which supports a motor (as for example an electric motor) 53. The motor-power take-off 54 is connected to apulley 55, which is connected through abelt 56 to asecond pulley 57 mounted onrotatable member 60, journalled for rotation in amember 66. The entire motor, belt and pulleys are joined together by arigid frame 65, which slides onframe 52 and is adjustable in its height by handle 59, which is attached to a threaded mating portion of anupstanding member 58 which permits the member to be lengthened. This permits the level of the motor, the two pulleys and the belt above the ground to be varied. - On
member 60 is a second power take-off 61. This is preferably a universal take-off. It is provided, as is shown in Figure 4 with a flange having a plurality ofholes 62. These holes are designed to engage wheel studs, and may be slotted, as shown in Figure 4, so that they can accommodate the wheel studs of several different types of vehicles and so that they also have, to some extent, a self-centering feature. - The operation of the apparatus as shown in Figures 1 and 2 will now be described. When it is desired to regrind brake discs the calipers holding the brake shows are removed from their association with the disc to be reground. The vehicle is placed on a jack or other supporting means and the tire associated with the wheel on which the brake disc is to be reground is removed.
- The
apparatus 10 is then attached to the caliper-mounting bracket 5, as by fittingholes set screw 18 and thehandle 26 are operated so that the two abrasive discs are positioned on opposite sides of the disc to be ground, with the abrasive faces 36 and 37 facing the disc. Theaxis 40 is positioned to be outside the periphery of the disc. In Figure 1, this axis is shown as beside the disc, but it is evident that it could be slightly outside the periphery but below or above thedisc 2, rather than beside it, if there is sufficient space to mount the apparatus in that orientation. The distance from the axis to the periphery of the disc depends on how much overlap is desired between theabrasive pads - The
handle 26 is then operated so that the twomembers disc 2 to be reground. - Once the apparatus is set up in this way, the
wheel 3 and the associateddisc 2 are rotated. In some cases, where the vehicle wheel is powered by the vehicle engine, this may be done by actuating the vehicle engine. However, in the majority of cases this will not be feasiable. In such cases, it is preferred to rotate the vehicle wheel by applying power to the wheel by external means. One suitable arrangement is that shown in Figure 3 wheremotor 53 drives, power take-off 61. The handle 59 is adjusted until take-off 60 is at the height of theaxle 6 and facing the outside-ofwheel 3. Theslots 62 are fitted overwheel studs 4, and bolts are attached to ensure that the wheel studs remain in position. Then,motor 53 is actuated, causingwheel 3 anddisc 2 to rotate. - When
wheel 3 anddisc 2 rotate, they causesdiscs disc 2, to rotate also. The directions of rotation are shown byarrows disc 2 and the abrasive surface of 36 and 37, there will of course be considerable bending torque on themetal discs members bearings discs disc 2, to causediscs discs brake disc 2. However, this is not preferred, as there is some possibility of scoring the brake disc with this arrangement. - As the
discs abrasive coatings wheel disc 2. The effect of the rotatory motion of the abrasive discs, and of thewheel disc 2 provides a smooth uniform grinding of the disc surfaces. - When the disc surfaces have been ground sufficiently,
motor 53 is switched off, and theabrasive pads discs abrasive coatings - The operation proceeds in an analagous manner when
apparatus 10a is used instead ofapparatus 10. Usingapparatus 10a, it is not absolutely necessary, in all cases, tp remove the calipers before grinding a disc. However, the,calipers will usually be removed, to give the operator more room in which to work while placing his abrasive discs in position around the wheel disc. - As mentioned above, the axes of the two
axes disc 35 would be provided. While it is possible to have the two discs having the same axis 40-40', it may be convenient to have the larger disc have a different axis of rotation than the smaller disc. This is still within the scope of the invention. - As noted above, it is possible to have only a single disc present, when it is desired to abrade only one side of a wheel disc. If this arrangement is used, it will then of course not be possible to have a threaded
rod 23 running between the twomembers member 21 and its associated disc would be removed, and threadedrod 23 would be welded tomember 14, instead ofmember 21. It is not preferred to abrade a single side of the brake disc in this way, as the considerable pressure of theabrading disc 35 and itsabrasive coating 37 against thewheel disc 2 might cause thewheel disc 2 to wobble on its axis. However, in cases where thewheel disc 2 is firmly seated on its axis, and only one side of the disc needs to be reground, this arrangement can be used. It would of course also be possible to omit themember 22,rod 23 and handle 26 and instead to leavemember 21 in position, with a suitable arrangement to forcemember 21 towarddisc 2, so that abradingdisc 34 and its associatedabrasive coating 36 are in tight frictional contact withdisc 2. - Although the abrading
discs disc 2, it is within the scope of the invention to power such abrading discs. Powering such discs may be advisable where a very polished finish is desired . to thedisc 2, as the abrading discs can then be caused to rotate at a higher speed than thedisc 2, and, when used with very fine abrasive, this will result in a highly polished finish. - It is generally preferred to use the
arrangement 10 rather than thearrangement 10a, as it is found to be more convenient to mount the disc grinding apparatus on the caliper-mounting bracket, rather than having it mounted permanently on a dolley. However, different motor vehicles have different caliper-mounting brackets, and it is therefore advisable to have the option of placing the device on a dolley, as shown in Figure 3, in cases where theholes - If the brake disc is removed from the vehicle for grinding, then the
arrangement 10a can be used. Theadapter 61 is replaced by a suitable mounting for the brake disc for rotation by themotor 53, throughshaft 60; and theapparatus 10a is brought into contact with the sides of the brake disc as described for grinding. - It will be understood that the invention has been described with respect to particular embodiments, and that obvious modifications thereto will occur to persons skilled in the art. It is therefore intended that the invention shall not be limited to the details of the particular embodiments described, but shall rather be given the full scope as claimed in the appended claims.
- It is found that, in many circumstances, brake discs which are to be resurfaced have been worn unevenly. In some cases, the brake disc is thinner, by reason of wear, closer to the centre than it is at the periphery. In other instances, the brake disc is thinner at the periphery than it is at the centre.
- It has therefore been found useful to provide apparatus in which the two opposed abrading discs rotate about axes which are substantially parallel to one another and can be adjusted to be slightly non-parallel. The two axes of rotation do not depart greatly from the parallel. In practice, it is found that a departure of about 5 to 15 degrees is adequate to permit the abrading discs to adapt to brake discs found in normal use on vehicles. Obviously abrading discs which could be adjusted so that their axes of rotation are at larger angles to one another than 15 degrees could be provided if desired, but such are not needed to grind brake discs most frequently encountered in automobile repair.
- The orienting of the abrading discs about axes which are slightly off-parallel also permits the use of conventional thrust bearings, mounted about
axles bearings discs wheel 3 would be arranged to be closer together than the portions closest to themember 15. The two abrading discs are then locked tightly against the brake disc to be ground, and the slightly non-parallel arrangement of the axes of rotation puts pressure on the thrust bearings, so that they do not wobble during the grinding operation.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT79301271T ATE4448T1 (en) | 1978-06-29 | 1979-06-29 | METHOD AND EQUIPMENT FOR GRINDING AUTOMOTIVE BRAKE DISCS. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA306,470A CA1123605A (en) | 1980-12-08 | 1978-06-29 | Brake disc grinding method and apparatus |
CA306470 | 1978-06-29 | ||
US94097578A | 1978-09-11 | 1978-09-11 | |
US940975 | 2001-08-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0006764A1 true EP0006764A1 (en) | 1980-01-09 |
EP0006764B1 EP0006764B1 (en) | 1983-08-17 |
Family
ID=25668726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79301271A Expired EP0006764B1 (en) | 1978-06-29 | 1979-06-29 | A method and apparatus for grinding vehicle brake discs |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0006764B1 (en) |
AU (1) | AU532016B2 (en) |
DE (1) | DE2966063D1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0075064A1 (en) * | 1981-09-18 | 1983-03-30 | Honda Giken Kogyo Kabushiki Kaisha | Abrading device for a brake disc |
EP0078094A1 (en) * | 1981-10-23 | 1983-05-04 | Richard Yeatman-Reed | Brake disc machining apparatus |
EP0193240A2 (en) * | 1985-03-01 | 1986-09-03 | Jozef Gijsbert Haanschoten | Coupling member for a wheel support of a vehicle and driving device for such a wheel support |
EP0201889A2 (en) * | 1985-05-14 | 1986-11-20 | Galletti, Ermanno | Machine for grinding the brake discs of motor-vehicles |
FR2782027A1 (en) * | 1998-08-06 | 2000-02-11 | Economie Mixte Des Transports | In situ truing of brake discs for urban rail vehicles, reducing vehicle downtime and reducing maintenance costs, using tool that requires no specialized structure |
WO2015079236A3 (en) * | 2013-11-27 | 2015-11-19 | Aston Martin Lagonda Limited | Brake conditioning |
CN107520728A (en) * | 2017-09-05 | 2017-12-29 | 重庆万可阳车辆配件制造有限公司 | A kind of derusting mechanism for brake disc |
CN117047590A (en) * | 2023-10-10 | 2023-11-14 | 靖江市恒铖机械配件制造有限公司 | Double-sided simultaneous grinding equipment for automobile brake disc |
US12000329B2 (en) | 2018-12-17 | 2024-06-04 | Aston Martin Lagonda Limited | Assemblies for engines |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106956184B (en) * | 2017-04-11 | 2019-05-10 | 扬州恒众精密机械有限公司 | A kind of efficient grinding device of brake clutch piece production |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1352248A (en) * | 1964-05-15 | Brake disc grinding machine | ||
DE1906407U (en) * | 1962-05-12 | 1964-12-10 | Arnaldo Cipolloni | MACHINE TOOL FOR MACHINING TWO EACH OTHER PARALLEL SURFACES ON WORKPIECES, IN PARTICULAR FOR DRESSING BRAKE DISCS. |
US3456401A (en) * | 1965-08-30 | 1969-07-22 | Ammco Tools Inc | Brake disc grinder |
DE1905891A1 (en) * | 1968-02-12 | 1969-09-18 | Dev Engineering Inc | Reaction kettle for hydrogenating lime or the like and a method for its control |
US3500589A (en) * | 1967-07-25 | 1970-03-17 | Fmc Corp | Disc brake grinder |
US3521411A (en) * | 1966-05-21 | 1970-07-21 | Teves Kg Alfred | Disk-brake cleaning method |
US3590537A (en) * | 1969-11-04 | 1971-07-06 | Teves Kg Alfred | Disc-brake cleaning apparatus |
US3619952A (en) * | 1969-07-10 | 1971-11-16 | Universal American Corp | Machine for surfacing brake discs |
DE2316672A1 (en) * | 1972-09-06 | 1974-03-28 | Hans Gramlich | GRINDING DISC BRAKES |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2540187C3 (en) * | 1975-09-10 | 1980-06-19 | Georg Moessel | Calibration device for brake disks of disc brakes of motor vehicles |
-
1979
- 1979-06-28 AU AU48500/79A patent/AU532016B2/en not_active Ceased
- 1979-06-29 DE DE7979301271T patent/DE2966063D1/en not_active Expired
- 1979-06-29 EP EP79301271A patent/EP0006764B1/en not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1352248A (en) * | 1964-05-15 | Brake disc grinding machine | ||
DE1906407U (en) * | 1962-05-12 | 1964-12-10 | Arnaldo Cipolloni | MACHINE TOOL FOR MACHINING TWO EACH OTHER PARALLEL SURFACES ON WORKPIECES, IN PARTICULAR FOR DRESSING BRAKE DISCS. |
US3456401A (en) * | 1965-08-30 | 1969-07-22 | Ammco Tools Inc | Brake disc grinder |
US3521411A (en) * | 1966-05-21 | 1970-07-21 | Teves Kg Alfred | Disk-brake cleaning method |
US3500589A (en) * | 1967-07-25 | 1970-03-17 | Fmc Corp | Disc brake grinder |
DE1905891A1 (en) * | 1968-02-12 | 1969-09-18 | Dev Engineering Inc | Reaction kettle for hydrogenating lime or the like and a method for its control |
US3619952A (en) * | 1969-07-10 | 1971-11-16 | Universal American Corp | Machine for surfacing brake discs |
US3590537A (en) * | 1969-11-04 | 1971-07-06 | Teves Kg Alfred | Disc-brake cleaning apparatus |
DE2316672A1 (en) * | 1972-09-06 | 1974-03-28 | Hans Gramlich | GRINDING DISC BRAKES |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0075064A1 (en) * | 1981-09-18 | 1983-03-30 | Honda Giken Kogyo Kabushiki Kaisha | Abrading device for a brake disc |
DE3212443A1 (en) * | 1981-09-18 | 1983-04-14 | Honda Giken Kogyo K.K., Tokyo | GRINDING DEVICE FOR BRAKE DISCS |
EP0078094A1 (en) * | 1981-10-23 | 1983-05-04 | Richard Yeatman-Reed | Brake disc machining apparatus |
EP0193240A2 (en) * | 1985-03-01 | 1986-09-03 | Jozef Gijsbert Haanschoten | Coupling member for a wheel support of a vehicle and driving device for such a wheel support |
EP0193240A3 (en) * | 1985-03-01 | 1986-12-10 | Jozef Gijsbert Haanschoten | Coupling member for a wheel support of a vehicle and driving device for such a wheel support |
EP0201889A2 (en) * | 1985-05-14 | 1986-11-20 | Galletti, Ermanno | Machine for grinding the brake discs of motor-vehicles |
EP0201889A3 (en) * | 1985-05-14 | 1989-05-17 | Galletti, Ermanno | Machine for grinding the brake discs of motor-vehicles |
FR2782027A1 (en) * | 1998-08-06 | 2000-02-11 | Economie Mixte Des Transports | In situ truing of brake discs for urban rail vehicles, reducing vehicle downtime and reducing maintenance costs, using tool that requires no specialized structure |
WO2015079236A3 (en) * | 2013-11-27 | 2015-11-19 | Aston Martin Lagonda Limited | Brake conditioning |
CN105934604A (en) * | 2013-11-27 | 2016-09-07 | 埃斯顿·马汀·拉共达有限公司 | Brake conditioning |
US9989118B2 (en) | 2013-11-27 | 2018-06-05 | Aston Martin Lagonda Limited | Brake conditioning |
EP3715662A1 (en) * | 2013-11-27 | 2020-09-30 | Aston Martin Lagonda Limited | Brake conditioning |
CN107520728A (en) * | 2017-09-05 | 2017-12-29 | 重庆万可阳车辆配件制造有限公司 | A kind of derusting mechanism for brake disc |
US12000329B2 (en) | 2018-12-17 | 2024-06-04 | Aston Martin Lagonda Limited | Assemblies for engines |
CN117047590A (en) * | 2023-10-10 | 2023-11-14 | 靖江市恒铖机械配件制造有限公司 | Double-sided simultaneous grinding equipment for automobile brake disc |
CN117047590B (en) * | 2023-10-10 | 2024-01-26 | 靖江市恒铖机械配件制造有限公司 | Double-sided simultaneous grinding equipment for automobile brake disc |
Also Published As
Publication number | Publication date |
---|---|
EP0006764B1 (en) | 1983-08-17 |
AU532016B2 (en) | 1983-09-15 |
DE2966063D1 (en) | 1983-09-22 |
AU4850079A (en) | 1980-01-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4361988A (en) | Brake disc grinding method and apparatus | |
US4262452A (en) | Disc brake grinding apparatus and method | |
US7261623B1 (en) | Wood floor sanding machine | |
US4493231A (en) | Method and device for machining brake disks | |
EP0006764A1 (en) | A method and apparatus for grinding vehicle brake discs | |
US4766702A (en) | Disk brake grinder | |
US4226146A (en) | Portable lathe device | |
US5921848A (en) | Multi-directional abrading machine | |
CN212977720U (en) | Deburring equipment for surface of sprayed part | |
JPS5871053A (en) | Polishing device of cylindrical vessel | |
US4098029A (en) | Axle grinder | |
CN109366314A (en) | A kind of portable dust-proof intelligent belt grinder | |
JP3290235B2 (en) | Polishing method and polishing device | |
US5031363A (en) | Hand held non-directional disc brake rotor finishing device | |
JPH09125302A (en) | Working vehicle for removing rust of rail tread | |
CN113500503A (en) | Automobile wheel hub polishing system | |
US5125187A (en) | Mounted non-directional rotor finishing device | |
US6234888B1 (en) | Method and apparatus for transmission repair | |
US4741129A (en) | Method and apparatus for honing truck ring gear bearing surfaces | |
GB2085773A (en) | Brake disc machining apparatus | |
CN213702912U (en) | Abrasive belt grinding machine for brake head of common-speed railway passenger car | |
EP0078094A1 (en) | Brake disc machining apparatus | |
CN214024928U (en) | Processing device of disc brake for forklift | |
CN218984300U (en) | Coating film passivation treatment tool based on milling cutter machining | |
JPH0719712Y2 (en) | Brake wheel polishing equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LU NL SE |
|
17P | Request for examination filed | ||
ITF | It: translation for a ep patent filed |
Owner name: SOCIETA' ITALIANA BREVETTI S.P.A. |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LU NL SE |
|
REF | Corresponds to: |
Ref document number: 4448 Country of ref document: AT Date of ref document: 19830915 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 2966063 Country of ref document: DE Date of ref document: 19830922 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19840626 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19840628 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19840630 Year of fee payment: 6 Ref country code: BE Payment date: 19840630 Year of fee payment: 6 |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19840830 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19860627 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19870630 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19880629 Ref country code: AT Effective date: 19880629 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19880630 |
|
BERE | Be: lapsed |
Owner name: GRAMLICH HANS Effective date: 19880630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19890101 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19890228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19890301 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Effective date: 19890630 Ref country code: BE Effective date: 19890630 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
EUG | Se: european patent has lapsed |
Ref document number: 79301271.7 Effective date: 19890220 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19950401 Year of fee payment: 17 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19960629 |