DE3108354A1 - Spot-type floating calliper disc brake - Google Patents

Abstract

In a spot-type floating calliper disc brake, a floating calliper (25) of first-like design surrounds the brake disc. The brake shoes (26) are held independently of the brake calliper (25) in brake-shoe support and guide webs (11). Provided on the brake anchor plate (18) are arms (19) which, at a point nearer to the brake cylinder (12) and radially further in than the brake-shoe support and guide webs (11), have axial guideways (16) with a V or semi-cylindrical cross-section. In order to be able to dispense with an expensive pin guiding means and to guarantee simple and reliable assembly, the essentially axially extending rectilinear limbs (14) of a leaf spring (15) of essentially U-shaped design engage in the guideways (16). The limbs (14) are prestressed in opposite directions in the circumferential direction. <IMAGE>

Description

The invention relates to a partial covering floating saddle

Disc brake with a arranged on one side of the brake disc Brake carrier from which two spaced apart in the circumferential direction Brake shoe support and guide webs extend axially over the edge of the brake disc, between those of the floating caliper through the one attached to the bottom of the brake cylinder Cross web of a U-shaped guide part is held, the two legs of which in complementary Guides of the brake carrier are arranged to be axially displaceable.

In a known partially lined floating caliper disc brake (DE-OS 27 07 058), axial guide bolts are attached to the brake calliper via a sheet metal part, which are axially displaceable in guide bores of the brake shoe support and guide webs are arranged. In another known floating caliper brake with one after Reach through type of floating saddle trained floating saddle (DE-OS 28 04 808) Axial guide pins attached to the brake carrier Axial bores of the floating caliper, so that it is guided axially displaceably on the brake carrier. Also other known ones Floating caliper brakes (US-PS 33 65 031 and 33 92 808) use axial guide pins for axially displaceable guidance of the floating saddle.

Because the axial guide pins are precisely machined and also rust-resistant have to be, they are very complex to manufacture and assemble. Corresponding applies to the sockets, which are generally provided with a Teflon insert the guide pin. When cornering there is a risk that the necessarily easily slidably mounted saddle of the known disc brakes in undesirable Way moves.

Das.Ziel of the present invention is thus a partially lined floating caliper disc brake ..tlt to create a floating saddle of the type mentioned at the beginning, in which on the complex fastener guide can be dispensed with, which can be installed easily and safely in which an unwanted shifting of the saddle at the wrong time is not to be feared must be and actively ventilate. The floating caliper brake according to the invention should also enable weight savings and are characterized by low space requirements.

To solve this problem, the invention provides that the guide part is a U-shaped spring, the legs of which are biased against one another in the circumferential direction are.

In the installed state, the spring should preferably have a substantially Cross web running parallel to the brake disc and two preferably not parallel have mutually extending legs. The legs can be to each other be arranged converging or, alternatively, diverging from one another. Through this there is advantageously a point overlap between the spring and the guides. The guides are expediently open to the inside in the circumferential direction and the legs to the outside biased.

In this way, with a single component, namely the U-shaped Spring a non-rigid, but play and rattle-free mounting of the floating saddle guaranteed, with such a friction between the spring and the brake carrier can be created that a shift of the Floating saddle is largely prevented when cornering or vibrations.

By eliminating the two rust-resistant guide bolts and the associated guide bushes with Teflon insert is a considerable simplification of production tied together achieved with a very substantial cost reduction. Problems with the bolt lock have also been remedied because guide bolts are no longer provided at all have to. The principle according to the invention can be applied to all floating saddles. the U-shaped spring can be accommodated with only a small footprint. Warehousing the brake shoes of the brake according to the invention can expediently be made so as described in DE-OS 28 04 808.

It is particularly advantageous if the spring is a leaf spring, whose particularly flat crosspiece is essentially parallel to the bottom of the brake cylinder runs in a plane parallel to the brake disc and its in the plane of the transverse web in the axial direction bent legs in inwardly open guides of the brake carrier inwardly evasive and axially displaceable, but in all other directions are stored in a fixed manner. The leaf spring can be produced particularly economically and also has the advantage that it follows the shapes of what it surrounds Brake cylinder can adapt particularly well, which benefits the small installation space requirement comes.

It is essential that in alignment with one or more holes at the bottom of the brake cylinder an approach is provided so that the cross web of the spring with its two areas extending on both sides of the approach to the Can spring towards the bottom of the brake cylinder. The legs of the spring must also be used for this laterally have a certain distance from the brake cylinder. In particular, through the approach into the bottom of the brake cylinder into a threaded hole arranged be, into which a screw bolt can be screwed through the bore.

The distance between the cross web of the spring from the brake cylinder base has Purpose to allow the brake to work without the thigh shift in their guides. Rather, with every normal braking only r The spring's crosspiece is resiliently deformed. This has the very significant advantage that the wear of the guides is reduced to a minimum. Only after one Certain wear of the brake pads leads to displacements of the legs of the spring in the guides, which corresponds to an adjustment of the brake clearance.

To achieve this beneficial effect, it is particularly useful if the crossbar is smaller due to its width or thickness or cutouts Has moment of resistance to deflection than the legs.

In addition, the training should preferably be such that the amount of bias the spring leg in every practically possible state at the points of contact with the guideways leads to frictional forces that occur when the brake is operated lead to a deflection of the crossbar, as it corresponds to the feed path of the brake. The delivery path is generally on the order of less than 1/10 mm.

In this way, the cross web, which is elastically deformed during braking, leads when releasing the brake for active release.

Because of this preferred training, they are put together in a simple way with the "roll-back" movement of the brake piston, an active clearance adjustment on both sides guaranteed. As a result, when the brake is not actuated, there is no braking torque due to dragging of the outer surface, and the known disadvantages, such as noise and uneven Lining wear is avoided in a very simple way. It is important, however, that the U-shaped leaf spring is firmly hinged by screwing to the approach of the Brake cylinder is applied.

A first practical structural embodiment is characterized by that the guides have the cross-sectional shape of a V, the leg opening of which is larger than the width of the thighs is. This creates a sliding guide created for the wear adjustment movement, which both in radial and in the circumferential direction a favorable transfer of weight and acceleration forces guaranteed from the floating caliper to the brake carrier. Each time you press the On the other hand, the brake caliper's feed movement is due to the elastic Deformation of the transverse web guaranteed.

A further embodiment which is particularly advantageous in terms of production technology provides that the guides have the cross-sectional shape of a semicircle or a rounded one Have U and the radius of the U is greater than half the width of the legs.

For example, in the case of a design with converging spring legs get by with a small installation depth and on the other hand a relatively large guide length to achieve, extend according to a further embodiment, the legs of the Spring expediently in the axial direction to the brake disc about as far as the cylinder. In other words, the brake cylinder and the legs are U-shaped The spring is essentially the same length.

Another structurally particularly favorable embodiment is designed in such a way that that the guides on arms of the brake carrier that are spaced apart in the circumferential direction are formed, from which the brake shoe support and guide webs branch off.

To attach the spring to the brake cylinder, the crosspiece of the spring should thus have at least one mounting hole and at a base on the ground of the brake cylinder is to be arranged accordingly a threaded hole through which a screw bolt can be screwed into the bore of the leaf spring.

In order to give the spring the greatest possible expansion elasticity, can this must be bent in an S-shape at the transition from the crosspiece to the legs. Through this also increases the risk of breakage for the spring in the critical corner area degraded.

With the legs that are designed to diverge from one another in the installed state the spring can have its legs for easier introduction during assembly in reduced in width, e.g.

rounded, executed.

The use of semicircular or V-shaped guide grooves enables point contact between the legs or the leg ends of the Leaf spring and the guides when the leaf spring legs are in-axial in the operating position Direction to each other slightly converging or diverging arranged in the guides are. Each leaf spring leg is then in the guide track or on that of the leaf spring facing end of the guide supported, so that thereby two bearings for the Saddle are created in the two guides or at their respective ends. Since the leaf spring is rigidly connected to the saddle, it is stable for storage Another storage point for the saddle housing required, which is given by this is that the caliper is positioned on the brake carrier via the brake shoe mounted on the brake carrier The point contact ensures that the leaf spring can be moved in the Guides when adjusting the wear path by moving the saddle opposite the brake carrier.

The invention is illustrated below, for example, with reference to the drawing described; 1 shows a schematic perspective view of a first embodiment of a partially lined floating caliper disc brake according to the invention in an exploded partial representation without brake shoes, FIG. 2 a partial sectional radial view of the object of FIG. 1 in the assembled state with brake shoes, Fig. 3 is a front view of the object of Fig. 2, Fig. 4 is a perspective illustration analogous to FIG. 1 of a further embodiment, Fig. FIG. 5 is a perspective view of that used in the embodiment of FIG U-shaped leaf spring in the non-installed, relaxed state, Fig. 6 is an end view of the object of FIG. 5 analogous to FIG. 3.

According to FIGS. 1 to 3, a fist-like floating saddle surrounds 25 the brake disc, not shown. The brake shoes 26 are independent of the brake caliper 25 held in brake shoe support and guide webs 11, as shown in detail in DE-OS 28 04 808 is shown and described.

The brake cylinder is on the saddle 25 on one side of the brake disc 12 trained. According to Fig. 2, the brake piston is within the brake cylinder 12 27 arranged, which the arranged on the same side of the brake disc brake shoe 26 applied immediately. The one on the opposite side of the brake disc The brake shoe 26 located is indirectly acted upon by lugs 28 of the brake caliper 25.

The Brawbackenabstütz- and guide webs 11 branch from two in the circumferential direction arms 19 extending in opposite directions on the brake carrier 18.

According to FIGS. 1 and 3, the arms 19 of the brake carrier on one the position closer to the brake cylinder 12 and further inward in the radial direction as the webs 11 on axial guides 16, which according to FIGS. 1 to 3 have a V-cross section have, the two open sides of the guides 16 in the circumferential direction opposite.

According to FIGS. 1 to 3 engage in the guides 16 which are essentially axially extending rectilinear leg 14 of a U-shaped in the wesere hen Leaf spring 15, whose connecting the two legs 14 is preferably flat In the installed state, the crossbar 13 rests against the shoulder 21 of the brake cylinder 12. in the In the bottom 17 and in the extension 21 of the brake cylinder 12 there is an axial threaded bore 23 intended. A screw bolt is used to attach the leaf spring 15 to the brake cylinder 12 24 is screwed through the central bore 20 into the threaded bore 23. Essential is that by only a single screw connection a secure cohesion between the leaf spring 15 and the floating caliper 25 is guaranteed.

In the circumferential direction, the transverse web 13 extends over a.

such a length that, as shown in FIG. 2, the legs in the installed state 14 run slightly converging to one another to the axial guides 16.

In Fig. 1, the leaf spring 15 is not only shown as it is inserted into the guides 16 (with 14 -drawn representation), but also in the form that it assumes when not compressed (with 14 ' labeled representation). Thereafter, in the dismantled state of the leaf spring 15 two legs 14 'against each other spread outwards.

For installation, the legs 14 'must therefore be in the. Position 14 inwards be squeezed. Practice in its installed state as shown in FIGS thus the legs 14 continuously one outward in opposite circumferential directions running force in the contact points (Fig. 3,6) on the guides 16 from. In the radial direction, the legs 14 fit into the guides 16 with a sliding fit.

In the embodiment according to FIGS. 4 to 6 denote the same Reference numerals correspond to parts as in the first embodiment according to FIG Fig. 1 to 3. In Fig. 5 is the Leaf spring 15 again in the relaxed State with splayed legs 14 illustrated. In Fig. 4 is the leaf spring 15 shown in the installed state.

In contrast to the first embodiment, the guides 16 according to FIGS. 4 and 6 have a semicircular-cylindrical cross section, the diameter the semi-cylindrical circular shape is greater than the width of the legs 14, so that According to FIG. 6, points of contact are approximately at an angle = 450 with respect to the tangential direction 22 with the edges of the legs 14 are present.

In order to increase the expansion elasticity of the leaf spring 15, the transition be bent from the transverse web 13 to the legs 14 according to FIG. 4 in an S-shape.

To the spring stiffness of the transverse web 13 of the leaf spring 15 in the desired Way to reduce, are in it on both sides of the bore 20 elongated cutouts 30 provided.

The spring stiffness of the leaf spring can also be achieved by other means E.g. changed cross-sections in crosspiece 13 can be changed.

Claims (15)

Partially lined floating caliper disc brake Patent claims Partly lined floating caliper disc brake with a brake carrier arranged on one side of the brake disc, from which two in the circumferential direction having a distance having brake shoe support and guide webs extend axially over the edge of the brake disc, between which the floating caliper housing through the crossbar of a U-shaped guide part attached to the bottom of the brake cylinder is held, the two legs of which in complementary guides on the brake carrier axially are arranged displaceably, thereby g e k e n n -z e i c h n e t that the guide part is a U-shaped spring, the legs (14) of which are biased against one another in the circumferential direction are. 2. Disc brake according to claim 1, characterized in that g e k e n n z e i c h -n e t that the spring (15) in the installed state is essentially parallel to the Brake disc extending transverse web (13) and two preferably not parallel to each other and substantially axially extending legs (14). 3. Disc brake according to claim 1 or 2, characterized in that g e -k e n n z e i c h n e t that the guides (16) are open to one another in the circumferential direction inwardly and the legs (14) of the spring (15) are biased outward. 4. Disc brake according to one of the preceding claims, characterized it is noted that the spring is a leaf spring (15), the transverse web of which (13) parallel to the bottom (17) of the brake cylinder (12) in a plane parallel to the Brake disc runs and its in the plane of the transverse web (13) in the axial direction bent legs (14) in inwardly open guides to each other (16) of the brake carrier (18) / inwardly evasive and axially displaceable, but in all other directions are stored in a fixed manner. 5. Disc brake according to claim 4, characterized in that g e k e n n -z e i c h n e t that the guides (16) have the shape of a V, the largest leg opening width is greater than the width of the legs (14). 6. Disc brake according to claim 4, characterized in that g e k e n n -z e i c h n e t that the guides (16) have the shape of a rounded U and the radius of the U is greater than half the width of the legs (14). 7. Disc brake according to one of the preceding claims, characterized it is noted that the legs (14) of the spring (15) are in the axial direction Extend towards the brake disc about as far as the cylinder (12). 8. Disc brake according to one of the preceding claims, characterized it is noted that the guides (16) are connected to one another in the circumferential direction Spaced arms (19) of the brake carrier (18) are formed, of which also branch off the brake shoe support and guide webs 01). 9. Disc brake according to one of the preceding claims, characterized it is not shown that the crosspiece (13) has a fastening drill hole (20) having. 10. Disc brake according to claim 9, characterized in that g e k e n n -z e i c h n e t that in alignment with a bore (20) in the bottom (17) of the brake cylinder (12) an approach (21) is provided. 11. Disc brake according to claim 10, characterized in that g e k e n n -z e i c h n e t that through the shoulder (21) into the bottom (17) a threaded hole (23) is arranged, in which a screw bolt (24) through the bore (20) can be screwed in. 12. Disc brake according to one of the preceding claims, characterized it is noted that the spring (15) at the transition from the transverse web (13) to the legs (14) is bent in an S-shape. 13. Disc brake according to one of the preceding claims, characterized it is noted that the transverse web (13) by its width or thickness or by means of cutouts (30) a lower section modulus against deflection has than the legs (14). 14. Disc brake according to one of the preceding claims, characterized it is not indicated that the amount of pretensioning of the spring legs (14) in every practically possible state in the contact points (22) on the guideways leads to frictional forces which, when the brake is actuated, result in deflection of the Cross web (13) lead, as it corresponds to the feed path of the brake. 15. Disc brake according to one of the preceding claims, characterized it is not noted that the transverse web is elastically deformed during braking (13) leads to active brake release when the brake is released.