DD300128A5 - Partly coated disc brake, in particular for motor vehicles - Google Patents

Abstract

The invention relates to a partially coated disc brake, in particular for motor vehicles, with a bolt-guided Bremsgehaeuse (2) of substantially U-shaped form, which is formed by two radially extending legs (4, 6) connected to each other via a bridge section (8) are, wherein a first radial leg (4) of the Bremsgehaeuses a Bremsbetaetigungseinrichtung, in particular a brake piston bears and with two on both sides of a brake disc to be arranged Bremsbelaegen (26, 28), which are held by pad retaining pins (38, 30). In order to achieve an improved wear and comfort behavior with low construction costs, it is provided according to the invention that the brake pads (26, 28) form extensions (54, 56, 58, 60) which, viewed in the circumferential direction, protrude against the pad retaining pins (38, 40). issue. Fig. 1 {disc brake; Motor vehicles; Brake housing, bolt guided; Brake piston; Brake pad; Pad retaining pin; Comfort behavior; construction costs; Approach}

Description

For this 6 pages drawings

Field of application of the invention

The invention relates to a partially lined disc brake, in particular for motor vehicles according to the preamble of claim 1.

Characteristic of the known technical solutions

There already Teilbelag disc brakes are known in which to improve the wear and comfort behavior, the brake pads werdon exclusively on train claimed; one speaks then of so-called, pulled Bremsbelägan. If these Teilbelag-Scheibonbremsen the brake pads are supported on the arms of the brake carrier. This results in an increased production cost. In addition, this type can not be used in so-called integrated brakes, in which a proper brake carrier is not present, but are formed on A <hsschcnkel arms that serve as a brake carrier and to which bolts are fixed, on which the brake housing is slidably mounted.

Hold-down springs are used to bias brake pads against a housing or against a brake carrier. Thus, the brake shoes are kept rattling. Such a wire spring is z. Example, in EP 0032462, which is supported with axially spaced substantially circumferentially extending legs on the one hand on the brake housing and with substantially circumferentially spaced axially extending legs on the other hand on the brake shoes. For each symmetry half of the disc brake two axially spaced legs are provided, which are supported at one end in the vicinity of the axis of symmetry, with its central part on the housing and with its second end in the circumferential direction on the outside of the brake shoe. Since the support of the brake shoe seen in the circumferential direction is outside, in order to prevent a radial lifting of a brake shoe, essentially only one leg of the wire holddown spring is effective.

Explanation of the essence of the invention The invention is therefore based on the object, a partial lining disc brake in the preamble of claim 1

stated Ar! to improve that while retaining the advantage of pulled brake pads of the

Production cost is reduced. Furthermore, a wire spring is to be specified, whose support points close to the Symmetryeachse centered on the brake shoe. This is a soft spring characteristic, the long of extending Thighs is achievable, preserved. This object is achieved in that the brake pads form approaches that, seen in the circumferential direction,

from the outside against the pad retaining pins can be applied, for transmitting braking forces on the pad retaining pins.

With the solution according to the invention, a partial lining disc brake is created with which an improvement in the wear

and comfort behavior is achieved, while reducing the manufacturing cost. In particular, the brake according to the invention can also be used as a so-called integrated brake. Machining operations at the shaft and in the

Interior of the bridge section can be omitted. According to an advantageous embodiment of the invention it is provided that at least one approach to the relevant Parting pad partially engages. With this embodiment it is ensured that the pads without additional Haltemitte!

securely held in the brake housing. Appropriately, the approaches are designed sickle-shaped.

A particularly advantageous embodiment of the invention provides that the brake housing in the bridge area Has recesses in which the pad retaining pins are arranged. In this way, a particularly space-saving Arrangement achieved, which is also advantageous in terms of strength. According to a further preferred embodiment, the brake has a central recess in the bridge section. In

this recess engages according to further embodiments arranged between brake housing and brake pads

Pen on. This spring forms a frame-shaped portion having sinen approach, for engaging in a brake housing

provided recess.

The invention also relates to a brake pad, in particular for use in a partially lined disc brake of the above

described type, wherein the covering has a back plate with lugs, viewed in the circumferential direction from the outside against

Pad retention pins can be applied. Advantageously, these approaches form crescent-shaped sections with recesses

are provided, for partially embracing the lining retaining pins.

The task of specifying a wire spring whose support points are centered, is in accordance with the features of Patent claim 18 solved. With the help of the cross-shaped overlapping spring legs is achieved that the support points

both the housing and the brake shoes are close to the axis of symmetry. Due to the length of Federschenkol also a soft characteristic is achievable. Due to the support on the radially inner surface of the caliper housing is

Housing over the outer brake shoes executed closed. This stiffening of the housing is achieved. If the ends of the struts are designed as axially extending limbs, then viewed over the circumferential direction,

the ends of the struts supported point-like on the caliper housing. This is advantageous in the circumferential direction available

Installation space used solely for applying the spring force. Furthermore, it is advantageous with the help of axially extending

• s cross-section circular leg allows sliding of the ends on the caliper surface.

With the help of the two legs connecting cross-connection over the outer brake shoe is advantageous, the location of itself

Cross-overlapping cross struts defined to each other, so that advantageously a symmetrical spring action on dio

Brake shoe is achievable. In a further development of the invention, the wire hold-down spring is provided with an axially projecting beyond the actuating unit End portion provided, which is fixed to a radially rising nubs of the actuating housing. Advantageously, two cross-shaped overlapping struts are also provided in the area above the inner brake shoe, whose Ends are supported on the caliper housing, so that advantageously acts on the inner brake shoe the same force as well as on

the outer brake shoe.

The innonliegende support surface of the caliper housing limits a kreissegmentförmlge recess so that advantageously the Spring in the axis of symmetry of the partially coated disc brake is centered. Is located in an area above the inner brake shoe end portion with circumferentially spaced itself

executed axially extending legs, so rely on large surfaces of the saddle housing, which are advantageous against each other slidably. For a simple self-aligning centering can be achieved. The other is advantageously prevented by the movement between the caliper housing and spring formation of corrosion.

In a simple embodiment, the end portion of the spring wraps around the knobs with an eyelet. In a further simple embodiment, the wire spring ends in the region of the eyelet with its two ends, thus the nubs

clasp resiliently. In other simple embodiments, the ends are either welded or soldered.

To achieve a bosseren resilient embrace is in the region of the nubs a cross-shaped overlap

provided so that the free ends of the eyelet resiliently clasp the knobs.

In this case, in a simple embodiment, the ends are superimposed on the back of the knot and terminate freely. If the eyelet engages around the knobs with little axial play and the struts of the end portion at least in the area of

Inner brake shoe partially rest on the actuator housing, so is a simple mounting of the spring on the

Achieved actuator housing, so that the spring is advantageously captively attached to the housing. In a simple embodiment of the knobs and the eyelet are rectangular. AusführunQsbelspiel Exemplary embodiments of the invention are illustrated in the drawing and described below. Show it 1 is a plan view of a first embodiment of a partially coated disc brake, 2 shows a front view of the partial lining disc brake shown in FIG. 1, partially in section, 3 shows a longitudinal section through the partially lined disc brake shown in FIGS. 1 and 2 and 4 is a schematic plan view of a second embodiment of a partially lined disc brake, Fig. 5 is an enlarged view of a spring, as according to the embodiment. Fig. 1 to 4 expedient use

finds

6 is a plan view of the spring of FIG. 5,

FIG. 8: a front view of the partially lined disc brake shown in FIG. 1 with the spring, partially cut away, FIG. 9: a longitudinal section through the brake disc brake shown in FIG 7 and 8 show the partial lining disc brake with the spring, FIG. 10 shows a side view of the spring, FIG. 11 shows a top view of the spring,

Fig. 12 is a side view of a second embodiment of the loads of FIG. 13: a plan view of Fede ^r, 14 is shown in Figure 12.. A front view of the spring and Fig illustrated in Figures 12 and 13 15:.. A front view the spring, partially cut.

In the figures, identical or appealing components are provided with the same reference numerals for the sake of clarity.

Reference will first be made to the first embodiment of a partially lined disc brake shown in FIGS. 1 to 3. The partial lining disc brake, which is shown here as an integrated disc brake, has a U-shaped brake housing 2, which is formed by two substantially radially extending legs 4, 6 and a bridge section 8 connecting them. The frame-like Bremsgehäuso 2 is mounted axially displaceably on two guide pins 10,12. The guide pins are screwed into formed on the steering knuckle arms, of which only the arm 14 is shown here in an outline. The guide pin 10 (main support pin) is formed by a sleeve 16 which is clamped by means of a screw 18 on the arm 14 as shown in Fig. 3. The exposed sliding surfaces of the guide pins are covered with bellows protective caps 20 and Il .

The brake housing 2 surrounds the edge of a brake disc 24 from the outside and two brake pads 26 and 28 arranged on both sides of the brake disc, also referred to below as brake shoes. The inner leg 4 dos brake housing, hereinafter also called actuator housing, receives an actuator in the form of a hydraulically actuated brake piston 30 which acts against the inner brake pad 26. The brake piston 30 is mounted in a bore 32 and is pushed out upon actuation of the brake from this, whereby initially the inner lining 26 is pressed against the brake disk 24. In response, the brake housing 2 moves in the opposite direction, so that de.r brake pad 28 comes to rest on the brake disc.

The brake housing has two elongated recesses or openings 34,36, which are arranged in the bridge section 8 and whose main direction is substantially parallel to the axis of symmetry of the brake. In these openings 34,36, which extend substantially over the entire bridge section, pad retention pins 38,40 are arranged, which extend parallel to the axis of symmetry of the brake and which are mounted with their ends in the brake housing 2. For this purpose, 4.6 holes are provided in the legs, wherein the pad retaining pins 46,40 are fixed internally by means of clamping elements in the corresponding bore.

The brake housing further has a central opening or a central opening 42 into which a spring 64 engages. As a result of the arrangement of the apertures 34,36 remain in the region of the bridge portion 8 outboard, approximately triangular in cross-section portions 46,48, so that the brake housing as a whole forms a frame-like configuration. The outer tavern! 6 forms a radially outer continuous portion, from which protrude radially inwardly leading projections, of which in Fig. 2, only the projection 50 is visible, and form an approximately U-shaped recess or limit. The radially outer continuous portion is provided with a stiffening rib 52, which also extends in particular continuously.

The brake pads 26,28 each have a back plate 27,29 on which a friction lining is attached. The back plates 27, 29, hereinafter also referred to as carrier plates, are provided with lugs 54, 56 and 58, 60, respectively, which extend radially outwards and form crescent-shaped portions which partially support the peg retaining pins 38, 40 (approximately to their middle ) embrace. The lugs 54, 56, 58, 60 extend obliquely outward from the upper edge of the back plate with respect to the axis of symmetry of the brake at an acute angle. They engage in the respect to the lining retaining pins outer part of the openings 34,36 and lie with a part-circular bearing surface, of which in Fig. 2 nu r the contact surface 62 can be seen on the pad retaining pins 38,40. The approaches end within the breakthroughs 34,36. The outer boundary of the back plates goes over without a step or kink from a straight boundary in the region of the friction masses into a curved boundary in the region of the projections.

The arranged between the brake housing 2 and the brake pads 26,28 spring 64, which is shown enlarged in Figs. 5 and 6, braces the brake pads against the brake housing. The spring 64 has a frame-shaped portion which forms two parallel side parts 66,68, which are connected via connecting portions 70,71,72,73 with central parts 74, 76 of the spring. The connecting portions 70,71,72,73 extend with respect to the central file 74,76 at an obtuse angle. The side parts 66,68 form curved outside sections to rest on the brake pads. Starting from the side parts 66,68, jump four mutually opposite legs 77,78,79,80 into the interior of the frame-shaped portion, which protrude with their curved end portions in the opening 42. From the central portion 76 there is formed a lug 82 having legs 84, 86 which extend at an angle upward from a reference plane formed by the central portion 76 (Figure 5). The legs 84,86 have curved end portions 88,90 to pass through in the; Brake housing 2 provided opening 42 and locking in adjacent to the opening 42 formed trough-like recesses 03,85. The spring 64 also has a tongue 87 which forms a bearing surface which rests on a shoulder 89 of the brake housing formed adjacent to the region of the central opening.

In this embodiment, it is ensured that the brake pads are loaded exclusively pulled, d. h., In a direction of rotation, as indicated in Fig. 2 by an arrow, the braking forces effective in the circumferential direction are transmitted almost exclusively via the pad retaining pin 40. From the pad retaining pin, the forces are conducted into the brake housing and transferred from this to the bolt guide.

The pad retaining pins are suitably made of stainless steel, so that an improvement of the corrosion behavior is achieved.

In the Ausführungsfo shown in Figure 4 m, the brake housing 92 seen in the circumferential direction forms outer U-shaped sections, wherein the pad holding pins 94,96 are mounted in the legs of the U-shaped sections, one of which is designated 98. As in the embodiment according to FIGS. 1 to 3, the back holding plates of the brake linings 100, 102 partially surround the pad holding pins 94, 96 from the outside. The pad retaining pins 94,96 are guided through holes in the outer legs and screwed into provided in the inner legs threaded holes. To replace the pads one of the guide pins is pivoted. After removing one of the pad retaining pins 38, 40, the brake pads can be removed.

FIGS. 7, 8 and 9 show a spring 164, which is placed with an eyelet 166 of an end section 168 around a radially rising knob 170. The nub 170 extends above the radial leg 4 designed as the actuating housing. The partial lining disk brake is formed substantially symmetrically with respect to the planes of symmetry 172, 174 with the axes 172, 174. Parallel adjacent bars 176,178 of the end portion 168 are supported on a support surface 180 of the actuator housing 4. Axially extending legs 182, 184 of the spring 164 spaced apart in the circumferential direction 193 are supported on an inner surface 186 of the bridge section 8, which delimits a circle-segment-shaped projection 188 in the brisket section 8. Axially extending legs 190, 192, spaced circumferentially 193, are supported on the support plates of the brake basins 26, 28, where the distance between the support points and the axis of symmetry 174 is less than the distance of the support point from the circumferentially outermost point of the friction lining. The spring is constructed symmetrically to the axis of symmetry 172.174 and bent from a one-piece spring wire piece so that the free ends are behind the knobs and welded or soldered. The arranged between the brake housing 2 and the brake pads 26,28 spring 164, which is increased in Figs. 10 and 11, braces the brake shoes 26,28 relative to the brake housing. 2

The legs 182,184 extend in axial length over both brake shoes 26,28 to the end portion 168. Connecting webs 194,196 spread at an angle 198 of about 45 "with respect to the axis of symmetry 172 and connect the adjacent bars 176,178 with the legs 182,184 On the outer brake shoe 28, the spring 164 has a section 200 with two crosswise overlapping struts 202 and 204. The legs 190, 192 resting on the brake shoes 26, 28 are interconnected in the area of the inner brake shoe 26 with a connecting web 206 extending substantially in the circumferential direction 193 12 to 15 show a second embodiment of the spring 164, wherein the legs 182, 184 are interconnected in the region of a plane which is near the outer brake disk surface 208 with a connecting web 210. The end section 168 has an area above the inner brake shoe 26 two U shaped segments 212, 214 having their circumferentially spaced outer legs 182, 184 disposed substantially coaxially with the legs 182, 184. Of the legs 182 ', 184' lead two cross-shaped overlapping struts 216,218 to the legs 190,192. The other legs of the U-shaped segments 212, 214 are designed as rods 176, 176 parallel to the axis of symmetry 172 and mutually adjacent bars. The base of the two U-shaped segments 212, 214 is formed by two limbs 220, 222 extending in the circumferential direction 193. In the region of the eyelet 166, the rods 176,178 intersect, so that the sections 224,226 and 228,230 of the eyelet 166 extending in the circumferential direction 193 are arranged one above the other in the radial direction.

Claims (32)

Partial disc brake, in particular for motor vehicles, with a bolt-guided brake housing of substantially U-shaped configuration, which is formed by two radially extending legs which are interconnected via a bridge portion, wherein a first radial leg of the brake housing, a brake actuator, in particular carries a brake piston and with two on both sides of a brake disc to be arranged brake pads, which are held by pad retaining pins, characterized in that the brake pads (54,56,58,60) form approaches that, seen in the circumferential direction, from the outside against the pad retaining pins (38, 40) can be applied, for transmitting braking forces on the pad retaining pins. Second partially coated disc brake according to claim 1, characterized in that at least one approach (54,56, 58,60) the respective pad retaining pin (38,40) at least partially surrounds. Partial-disc brake according to one of the preceding claims, characterized in that the lugs (54,56,58,60) form a crescent-shaped portion. 4. Parting disc brake, in particular for motor vehicles, with a bolt-guided brake housing of substantially U-shaped configuration, which is formed by two radially 'extending legs which are interconnected via a bridge portion, wherein a first radial handle of the brake housing, a brake actuator , in particular a brake piston carries and with two on both sides of a brake disc to be arranged brake pads, which are held by pad retaining pins, in particular according to one of the preceding claims, characterized in that the brake housing (2) in Boreich the bridge section (8) has recesses (34,36) in which the pad retaining pins (38,40) are arranged. 5. Parting disc brake according to one of the preceding claims, characterized in that the brake housing (2) in the bridge section (8) has a central opening (42). Partial disc brake according to one of the preceding claims, characterized in that a spring (64) is arranged between the brake housing (2) and the brake linings (26, 28). 7. Teilbelagscheibenbremse according to claim 6, characterized in that the Fede »· (64) engages in the central opening (42). 8. Partial lining disc brake according to one of the preceding claims, characterized in that the brake housing (2) forms lateral U-shaped sections, wherein the pad retaining pins (94,96) are mounted in the legs of the U-shaped sections. 9. Brake lining, in particular for use in a partially lined disc brake according to one of the preceding claims, characterized in that the covering (26,28) has a back plate (27,29) with lugs (54,56,58, 60), the , Seen in the circumferential direction, from the outside against pad retention pins (38,40) can be applied. 10. Brake lining according to claim 8, characterized in that the lugs (54,56,58,60) have a crescent-shaped portion. 11. Brake lining according to claim 8 or 9, characterized in that the lugs (54,56,58,60) have a Ausnenmung for partially gripping the lining retaining pins. 12. Brake lining according to one of the preceding claims, characterized in that the lugs (54,56,58,60) extend radially obliquely outwardly with respect to the brake housing axis of symmetry. 13. Spring, in particular for use in a Teilbelagscheibenbremse according to any one of the preceding claims, characterized in that the spring (64) forms a frame-like portion having a lug for engaging in a brake housing provided in the opening (42). 14. Spring according to claim 13, characterized in that the frame-like portion has two, in particular parallel, side portions, for resting on parts of the brake pads (26, 28), wherein the side parts are connected via connecting portions with central parts of the spring and the connecting portions at an obtuse angle to this. 15. Spring according to claim 14, characterized in that projecting from the side parts at least two legs in the interior of the frame-like portion. 16. Spring according to one of the preceding claims, characterized in that the approach leg (66,68) which engage behind each in the boundary of the recess (42) formed shoulder (70,72). 17. Spring according to one of the preceding claims, characterized in that the spring (64) has a further portion or a tongue (80) which can be laid on a contact surface, which is formed in a leg of the brake housing (2). 18. A wire-retaining spring (164) for brake shoes (26, 28) of a partially lined disc brake which has an actuating housing (4), a bridge section (8) and a radially extending outer housing leg (6), the brake shoes (26, 28) ) Is held, which with two circumferentially (193) spaced, substantially axially extending legs (190,192) on the brake shoes (26,28) can be supported and at least one on the caliper housing (2 ) supporting section (200), in particular according to one of the preceding claims, characterized in that on the legs (190,192) two cross-shaped overlapping substantially in the circumferential direction (193) extending struts (202,204) of the portion (200) are arranged, whose ends (182, 184) are supported against a radially inner surface (186) of the bridge section (8). 19. A wire retaining spring according to one of the preceding claims, characterized in that the ends (182,184) of the struts (202,204) of two substantially axially extending, in the circumferential direction (193) spaced legs (182,184) of the portion (200) are formed. 20. Wire holding down spring according to one of the preceding claims, characterized gc indicates that the section (200) is closed with a substantially in the circumferential direction (193) radially over the outer brake shoe (28) extending cross-connection (210) au », which the connecting two legs (182, 184) of the section (200). 21. A wire-retaining spring (164) for brake shoes (26, 28) of a partial lining disc brake, which is held on a floating caliper housing (2) having an actuating unit (30, 32) and which has two circumferentially (193) spaced, substantially axially extending legs (16). 196,192) rests on the brake shoes (26,28), in particular according to one of the preceding claims, characterized in that an axially beyond the actuating unit (30,32) projecting end portion (168) of the spring (164) on a on actuation unit (4 ) seated, radially uplifting nubs (170) is attached. 22. wire hold down spring according to one of the foregoing claims, characterized in that the end portion (168) has two cross-shaped overlapping, substantially in the circumferential direction (193) extending further struts (216,218) at the circumferentially (193) spaced on the Brake shoes (26,28) resting legs (190,192) are arranged and their ends (212,214) are supported against an inner surface (186) of the bridge part (8). 23. wire hold down spring according to one of the preceding claims, characterized in that the ends (212,244) of the end portion (168) as U-shaped segments (212,244) are formed, in the axial direction (172) extending, in the circumferential direction (193) spaced leg (182 ', 184') are supported against the caliper housing (2). 24. wire holding down spring according to one of the preceding claims, characterized in that the inner surface (186) of the seat housing (2) defines a circular segment-shaped recess (188). 25. wire hold down spring according to one of the preceding claims, characterized in that the end portion (168) wraps around the knobs (170) with an eyelet (166). 26. wire hold down spring according to one of the preceding claims, characterized in that the eyelet (166) has the two ends (228,230) of the wire spring (164). 27. wire hold-down spring according to one of the preceding claims, characterized in that the ends (228, 230) are welded. 28. wire hold down spring according to one of the preceding claims, characterized in that the ends (228,230) are soldered. 29, wire holddown spring according to one of the preceding claims, characterized in that the end portion (168) has two of the eyelet (166) projecting axially extending adjacent rods (176.178) extending between the knob (170) and the inner brake shoe (26 ) in the region of the knot (170) overlap in a cross shape. 30. wire holding down spring according to any one of the preceding claims, characterized in that the ends (228,230) on the back of the nubs (170) lie one above the other and free ends. 31, wire hold down spring according to one of the preceding claims, characterized in that the rods (176,178) at least partially in the inner brake shoes (26) adjacent area on the actuating housing (2) rest and the eyelet (166) the knobs (170) with low axial play (S) encompasses. 32. wire hold down spring according to one of the preceding claims, characterized in that the nubs (170) is rectangular. 33. wire hold down spring according to one of the preceding claims, characterized in that the eyelet (166) is rectangular.