GB2145787A

GB2145787A - Spot-type disc brake fixing a guide element

Info

Publication number: GB2145787A
Application number: GB08420751A
Authority: GB
Inventors: Rudolf Thiel
Original assignee: Alfred Teves GmbH
Current assignee: Continental Teves AG and Co oHG
Priority date: 1983-09-02
Filing date: 1984-08-15
Publication date: 1985-04-03
Also published as: FR2551518B1; JPS6073130A; IT1176638B; DE3331656A1; BR8404117A; GB8420751D0; SE8404326L; IT8422505A0; FR2551518A1; SE8404326D0; SE457376B; ES535571A0; GB2145787B; ES8505458A1; MX161604A; ZA846087B

Abstract

A housing (1) especially of a spot-type disc brake is disposed in axially displaceable manner relative to a stationary mounting support by means of at least one guide element (2) fixed in a mounting bore (3) in the support or housing (1) and, with the guide portion (5) thereof, being axially disposed in a guide bore of the housing or support, the guide element (2) being fixed to housing (1) or to the support by (plastic) deformation (11, 14) of the guide element (2) within the mounting bore (3). As shown, guide element (2) is a carrier sleeve although it may be a carrier bolt - and the guide element may be force or push fitted into the mounting bore prior to the deformation. In Fig. 1 carrier sleeve (2) is shown deformed by expansion (14) to slope (6) in mounting bore (3) by means of caulking by a ball. In Fig. 3 deformation (11) engages groove (10). Fig. 4 has a plug pressed into the carrier sleeve - such could be used together with the embodiments of Figs. 1, 3. <IMAGE>

Description

SPECIFICATION Spot-type disc brake This invention relates to a spot-type disc brake of the kind comprising a stationary support and a housing which embraces a brake disc and brake shoes disposed on both sides of the brake disc and which is located in an axially displaceable manner on the mounting support, the bearing of the housing comprising at least one guide element fixed in a mounting bore in the support or housing and which, with the guide portion thereof, is axially located in a guide bore of the housing or support.

The invention also relates to a method of fixing a guide element in a bore of a component, especially the housing or mounting support of a spot-type disc brake of the kind wherein the housing embracing a brake disc and brake shoes disposed on both sides of the brake disc, along a guide element is disposed on the mounting support in an axially displaceable manner, with the guide element being fixed in a mounting bore in the housing or support and, with a guiding portion of the guide element in an axially displaceable manner being introduced into a guide bore of the support or housing.

Spot-type disc brakes of the kind referred to above are known in the art. German Patent Application P 32 44 789.2 describes a spottype disc brake having a stationary brake carrier and a U-shaped brake caliper disposed in axially displaceable manner on the brake carrier, with the bearing for the brake caliper including at least one guide bolt mounted on the brake carrier or brake caliper and, with a guide portion, being disposed in axially displaceable manner in a guide bore of the brake caliper or the brake carrier, wherein the guide bolt is fixed to the brake caliper or brake carrier by means of a weld joint. In this connection, it is especially the spot-type disc brakes according to DE-AS 1 6 00 007 and US-PS 3 981 843 that are capable of being improved so as to permit a compact and lower-priced construction.

However, it has proved that the provision of the welded joint according to P 32 44 789.2 in quantity production involves considerable effort thereby enhancing the price of the spottype disc brake.

It is, therefore, an object of the invention, to improve a spot-type disc brake of the kind referred to, and a process cf fixing a guide element in a bore of a component, especially the housing or mounting support of a spottype disc brake, of the kind referred to so as to permit, in quantity production, a simpler, less costly and easier manufacture of the spottype disc brake, without sacrificing the reliability of the brake.

According to one aspect of the invention, a spot-type disc brake of the kind referred to is characterised in that the guide element is fixed to the housing or mounting support by deforming the guide element within the mounting bore. Such a deformation within the mounting bore can be performed in a simple manner, ensuring that the guide element, even after many years' use, will not loosen and, hence, slip out of the housing or support.

The guide element as fixed in a manner according to the invention, may be either a carrier sleeve or a carrier bolt. In either case, an adequate plastic deformation can be attained to safeguard a reliable support of the guide element in the housing or on the support.

According to a beneficial embodiment of the invention, the guide element may be fitted into the mounting bore in the housing or the support with force or push fit causing the guide element prior to the provision of the deformation to sit firmly in the housing or the support thereby facilitating, on the one hand, the provision of the deformation and, on the other hand, the provision of an additional support force for the guide element disposed in the mounting unit.

In the case of known spot-type disc brakes the guide bolt was already inserted into the mounting bore with force or push fit. However, this type of fixing will not be adequate especially when using aluminium housings as, e.g. at high temperature fluctuations due to the different expansion coefficients of the materials used, the force fit frequently will not be sufficient to hold the guide element in the mounting bore. As during the braking operation force components occur tending to make the guide element migrate outwardly in the axial direction, according to P 32 44 789.2 a welded joint was provided in addition to force and push fit.

According to a preferred embodiment of the invention, the mounting bore in the outer end region thereof includes a slope outwardly increasing in diameter, which with the guide element inserted, forms a recess engaged by the deformed portion of the guide element thereby providing-without any additional auxiliary means-a safe fixing in one direction which is adequate especially with spottype disc brakes as the circumferential forces formed during the braking operation have no force component in lhe axial outward direction.

The slope in the mounting bore both when using carrier sleeves or carrier bolts, will require a length of as little as about 2 mm which will be adequate for a safe engagement of the deformation.

In the event that fixing in both directions is required, according to another embodiment of the invention, a groove may be formed in the mounting bore which is engaged by deforma tion of the guide element.

According to another embodiment of the invention, in a spot-type disc brake, in which the guide element is a carrier sleeve pressed into the mounting bore in the housing or support, in the area of the point at which the carrier sleeve enters the mounting bore, a plug may be provided within the carrier sleeve which plug is pressed with clearance into the carrier sleeve thereby providing additional reinforcement to the ''clamping point" of the carrier sleeve.

The carrier sleeve, hence, can be formed as a tube of relatively thin strength, with no likelihood of breaking at the point of the highest flexural moment, viz. at its clamping point. Moreover, by the introduction of the plug, the compression between the carrier sleeve and the housing or support is enhanced.

The guide system of the spot-type disc brake according to the invention, need not, however, be made up of a single guide element transferring all circumferential forces arising during the braking operation; in accordance with another embodiment of the invention, the support is formed of two guide elements, respectively fixed to the housing or to the support by force fit and additionally secured by deformation. The additional guide element has, essentially, only a guiding function, i.e. it prevents rattling of the parts so interconnected.

According to another aspect of the invention, a process of the kind referred to is characterised in that the guide element is fixed to the component by deformation of the guide element within the bore of the component. This type of fixing is not restricted to spot-type disc brakes although it has proved to be of special advantage in this application.

According to a particularly simple embodiment of the invention, the mounting bore formed in the housing or support of the spottype disc brake, at the outer end thereof. is slightly depressed, the guide element, thereafter, is pressed with force fit into the mounting bore and, finally, the guide element at the outer end thereof, by means of a caulking tool, is deformed to such an extent that the recess formed by depressing the mounting bore is engaged by the deformation thereby preventing the guide element from moving inwardly. In that type of mount, no additional fixation will be required. However, the guide element can still be pressed out, with relative ease, to one side which may be beneficial in certain fields of application.

Caulking can be performed in a particularly simple manner by means of a ball which can be easily made and replaced, if damaged; it will still fulfill its function also with guide elements of different diameters.

Using a carrier sleeve as the guide element, it has proved feasible for the deformation to continue until the wall of the carrier sleeve fills the interspace between the carrier sleeve and the mounting bore, thereby providing an especially safe fixing. The process of the invention can also be carried into effect, with advantage, if the component to be deformed is a carrier bolt which, at the corresponding point, is provided with a recess.

According to another particularly beneficial process embodiment of the invention, in which the guide element is a carrier sleeve, provides for a groove to be recessed in the mounting bore in the housing or support, and, thereafter, for the carrier sleeve in the area of the groove to be expanded, by means of a caulking tool to such an extent that the groove is engaged by the deformation, thereby securing. moreover, the carrier sleeve in both directions.

The deformation of the carrier sleeve can be performed in simple manner by means of an expansion arbor.

According to a still further embodiment of the invention, it is provided in the manufacture of a spot-type disc brake, wherein the guide element is a carrier sleeve fitted into the mounting bore in the housing or support. that a plug is pressed with clearance into the carrier sleeve to such an extent that it is located in the area of the point where the carrier sleeve enters the mounting bore, thereby ensuring in a simple manner that the carrier sleeve does not break at its clamping point of highest flexural moment, by providing this point with an additional reinforcement.

Moreover, the introduction of the plug will enhance the compression between carrier sleeve and housing or support.

Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a partial longitudinal section through a spot-type disc brake according to one embodiment of the invention, Figure 2 is an enlarged area of part of the embodiment shown in Figure 1, Figure 3 is a partial longitudinal section through another embodiment of a spot-type disc brake, Figure 4 is a partial longitudinal section through another embodiment of a spot-type disc brake.

Referring to the drawing, Figure 1 shows a housing 1 of a spot-type disc brake which can be connected, via a carrier sleeve 2, to a mounting support (not shown).

The mounting support is rigidly screwed to the steering knuckle of a motor vehicle. During operation of the brake, the circumferential forces arising are taken up by the carrier sleeve 2 and, via the mounting support, are introduced into the steering knuckle of the motor vehicle.

For receiving carrier sleeve 2, a mounting bore 3 is provided in housing 1 into which is pressed with force fit a mounting element 4 of carrier sleeve 2.

Carrier sleeve 2, externally, is flushly mounted with housing 1. Guiding element 5 inwardly protruding from mounting bore 3 is disposed in an axially displaceable manner (not shown) in a guiding bore formed in the mounting support.

As during the braking operation force components occur which tend to make the carrier sleeve 2 migrate outwardly in the axial direction, carrier sleeve 2 pressed into mounting bore 3 in housing 1 will require additional fixing. For this, mounting bore 3, prior to introduction of carrier sleeve 2, in the outer area thereof is slightly lowered. The slope 6 so formed, the diameter of which outwardly increases will, after introduction of carrier sleeve 2, form an interspace therewith.

Now carrier sleeve 2 will be deformed to such an extent as to fill the interspace. For this, according to the illustration of Figure 2, a ball 7 is provided caulking flushly pressed-in carrier sleeve 2. Expansion 1 4 of carrier sleeve 2 is defined by slope 6 in mounting bore 3.

Hence, carrier sleeve 2 can no longer move axially inwardly; however, it can still be pressed outwardly with relative ease. This may be of advantage in certain fields of application. In the case of the spot-type disc brake as illustrated, tests have shown that this extremely simple way of fixing is satisfactory so long as no outwardly directed forces occur.

To prevent the ingress of water or other impurities on this joint, the latter can be sealed outwardly by means of a (plastic) plug (not shown). For the purposes of inward sealing, a circumferential cover 8 is provided.

The drawings of the embodiments shown in Figures 3 and 4, respectively are in the form of a partial longitudinal section through a housing 1 according to Figure 1, in which a carrier sleeve 2 is pressed in a mounting bore 3 with force fit. Corresponding parts are therefore, designated by like reference numerals.

In the embodiment according to Figure 3, housing bore 3 has no slope formed in the end region thereof but has a groove 10 provided in the mounting part 4. In the area of the groove 10, carrier sleeve 2 is now expanded by means of a caulking tool to such an extent that groove 10 is engaged by deformation 11. The deformation 11 can be performed by means of an expansion arbor which is introduced from the outside into carrier sleeve 2.

In the event that carrier sleeve 2 is in the form of a thin tube, it might be feasible additionally to reinforce the point of highest flexural moment, viz. clamping point 1 2 of carrier sleeve 2. Clamping point 1 2 is the point where carrier sleeve 2 enters the eye of housing 1. For reinforcing purposes, a plug 1 3 is pressed with clearance into carrier sleeve 2 and, by means of a tool, is placed into the position shown in Figure 4. Although the compression between carrier sleeve 2 and housing 1 is enhanced, the tensions in housing 1 are reduced in that embodiment because the end of carrier sleeve 2 will remain flexible.

The embodiment according to Figure 4 permitting construction of the spot-type disc brake with relative ease, can be used either exclusively as a fixing unit or together with one of the embodiments shown in Figures 1 and 3.

The guide system of the afore-described spot-type disc brake is not restricted to the form shown in the embodiments.

In the embodiment according to Figure 1, a special carrier bolt may be used in place of carrier sleeve 2.

The guide system between housing 1 and the support (not shown) of the spot-type disc brake may also consist of two guide elements one of which is carrier sleeve 2 as shown in the drawing. A second guide element disposed at a space from carrier sleeve 2 may, in like manner, be fixed to housing 1 or to the mounting support.

The carrier sleeve 2 or the carrier bolt need not necessarily be fixed to housing 1. They can alternatively, in like manner, be fixed to the mounting support. In the latter case, the guide bearing for the guiding element would, hence, be formed in the housing.

Claims

1. A spot-type disc brake of the kind comprising a stationary mounting support and a housing embracing a brake disc and brake shoes disposed on both sides of the brake disc, and which is disposed in axially displaceable manner on the mounting support, the bearing for the housing including at least one guide element fixed in a mounting bore in the support or housing and which, with the guide portion thereof, is axially located in a guide bore of the housing or support, characterised in that the guide element (2) is fixed in the housing (1) or on the support by deformation (14, 11) of the guide element (2) within the mounting bore (3).

2. A spot-type disc brake according to claim 1, characterised in that the guide element is a carrier sleeve (2).

3. A spot-type disc brake according to claim 1, characterised in that the guide element (2) is a carrier bolt.

4. A spot-type disc brake according to any one of claims 1 to 3, characterised in that the guide element (2) is fitted into the mounting bore (3) in the housing (1) or the support with force or push fit.

5. A spot-type disc brake according to any one of claims 1 to 4, characterised in that the mounting bore (3) in the outer end region thereof includes a slope (6) outwardly increas ing in diameter, which, with the guide element (2) inserted, forms a recess engaged by the deformed portion (14) of the guide element (2).

6. A spot-type disc brake according to claim 5, characterised in that the slope (6) has a length of about 2 mm.

7. A spot-type disc brake according to any one of claims 1 to 4, characterised in that a groove (10) is formed in the mounting bore (3) which is engaged by a deformation (11) of the guide element (2).

8. A spot-type disc brake according to claim 1 in which the guide element is a carrier sleeve (2) pressed into the mounting bore (3) in the housing (1) or the support. characterised in that the area of the point (12) at which the carrier sleeve (2) enters the mounting bore (3), within carrier sleeve (2), is provided with a plug (13) which is pressed with clearance into the carrier sleeve (2).

9. A spot-type disc brake according to any one of the preceding claims, characterised in that the guide system between the housing (1) and the support is formed of two guide elements (2) respectively fixed to the housing (1) or to the support with force fit and are additionally secured by deformation.

10. A method of fixing a guide element in a bore of a component, especially the housing or mounting support of a spot-type disc brake, wherein the housing embracing a brake disc and brake shoes disposed on both sides of the brake disc, along a guide element is disposed on the mounting support in an axially displaceable manner, with the guide element being fixed in a mounting bore in the housing or support and, with a guiding portion of the guide element in an axially displaceable manner being introduced into a guide bore of the support or housing, characterised in that the guide element is fixed to the component by deformation of the guide element within the bore of the component.

11. A method according to claim 10, characterised in that the mounting bore formed in the housing or support of the spot-type disc brake, at the outer end thereof, is slightly depressed, that the guide elenient, thereafter, is pressed with force fit into the mounting bore and that, finally the guide element at the outer end thereof, by means of a caulking tool, is deformed to such an extent that the recess formed by depressing the mounting bore is engaged by the deformation thereby preventing the guide element from moving inwardly.

1 2. A method according to claim 11, characterised in that caulking is done by means of a ball.

1 3. A method according to claims 11 or 12, wherein the guide element is a carrier sleeve, characterised in that the deformation is continued until the wall of the carrier sleeve fills the interspace between the carrier sleeve and the mounting bore.

1 4. A method according to claims 11 or 1 2, characterised in that the component to be deformed is a carrier bolt.

1 5. A method according to claim 10, wherein the guide element is a carrier sleeve, characterised in that a groove is recessed into the mounting bore in the housing or the support and that. thereafter, the carrier sleeve.

in the area of the groove is expanded. by means of a caulking tool.to such an extent that the groove is engaged by the deformation.

16. A method according to claim 15, characterised In that the deformation of the carrier sleeve is effected by means of an expansion arbor.

1 7. A method according to any one of claims 10 to 16, wherein the guide element is a carrier sleeve pressed into the mounting bore in the housing or support. characterised in that a plug is pressed with clearance into the carrier sleeve to such an extent that it is located in the area of the point at which the carrier sleeve enters the mounting bore.

18. A spot-type disc brake substantially as described with reference to the accompanying drawings.

1 9. A method of fixing a guide element in a bore of a component. especially the housing or mounting support of a spot-type disc brake, substantially as described with reference to the accompanying drawings.