FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. Title of the Invention
BRAKE CALIPER FOR DISC BRAKE
2. Applicant(s)
Name Nationality Address
BREMBO S.P.A. Italian Via Brembo, 25 24035 Curno,
Bergamo, Italy
3. Preamble to the description
The following specification particularly describes the invention and the manner in which it is to be
performed
2
DESCRIPTION
[0001]. Field of the invention
[0002]. The present invention relates to a disc brake caliper and
a disc brake comprising said caliper.
[0003]. Hereafter, the disc brake caliper and a disc brake
assembly will be described with reference to the rotation axis of
the disc itself, indicated by reference X-X, which defines an axial
direction. Axial direction means any direction A-A directed parallel
to the rotation axis of the brake disc. Additionally, radial
direction means all directions orthogonal to rotation axis X-X and
incident therewith. Furthermore, circumferential direction C-C means
the circumference orthogonal to the axial direction and the radial
directions.
[0004]. Otherwise, tangential direction T-T means a direction
which is punctually orthogonal to an axial direction A-A and a
radial direction R-R.
[0005]. Background art
[0006]. On vehicles, in particular, in a disc brake, the brake
caliper is arranged straddling the outer peripheral margin of a
brake disc. The brake caliper usually comprises a body having two
elongated elements, referred to as side portions, which are arranged
to face opposite braking surfaces of a disc. There are friction pads
between each side portion of the caliper and the braking surfaces of
the brake disc. At least one of the side portions of the caliper has
cylinders adapted to accommodate pistons, actuated in any suitable
known manner (e.g. hydraulic or electro-mechanical pistons), capable
3
of applying a thrust action on the pads, abutting them against the
braking surfaces of the disc to apply the braking action on the
vehicle.
[0007]. Brake calipers are usually constrained to a supporting
structure which remains fixed to the vehicle, such as, for example,
a spindle of a vehicle suspension.
[0008]. In a typical arrangement, one of the two side portions has
two or more attachment portions of the body of the caliper to the
supporting structure, e.g. providing slots or eyelets, e.g. arranged
axially, or through holes, e.g. arranged radially, adapted to
receive screws for fixing the caliper which are received in threaded
holes provided on the caliper support with their ends.
[0009]. Such a side portion is referred to as the attachment side
portion or elongated vehicle-side element.
[0010]. The other portion is referred to as the non-attachment
side portion or elongated wheel-side elements.
[0011]. In a typical caliper body construction, the side portions
facing the braking surfaces of the disc are connected to each other
by bridge-like elements arranged straddling the disc, referred to as
bridges.
[0012]. As said, opposite pads are pressed in disc brake calipers,
by virtue of the action of at least one piston, against opposite
braking surfaces of a braking band of a braking band by the
associable brake disc.
[0013]. This piston is usually accommodated in a cylinder in the
4
body of the caliper and is energized by brake fluid pressurized by a
brake pump, usually a pedal in cars and a lever on motorcycles.
[0014]. Brake calipers are also known in which the piston, or the
pistons, is or are electro-mechanically energized, e.g. by the
rotation of a worm accommodated in the piston body and turned by an
electric motor, or more commonly by a ratio motor.
[0015]. Such a solution is known from US6607059B1 to SKF
Engineering and Research Center B.V. In one embodiment, this
document discloses a ratio motor connected to a recirculating ball
worm located inside the piston body. The worm is rotationally
supported by a first thrust bearing placed inside it and a
transmission shaft connects it to a planet gear disc of an epicyclic
gearbox placed over an electric motor. This epicyclic gearbox is
supported by a second thrust bearing at the end of the drive shaft
opposite to said piston.
[0016]. Therefore, this solution is highly cumbersome, especially
due to the long axial extension thereof.
[0017]. A solution to this problem is disclosed in US7021415B2 to
Stoneridge Control Devices, Inc. and in WO2015151052 to Brembo
Brakes S.p.A. These documents disclose an electrically operated
brake system and actuator. The actuator comprises a motor with a
motor shaft, and a gear train coupled to the motor shaft, in which
the gear has at least one mechanical output from the actuator. The
gear train includes a gear coupled to the drive shaft, a driven gear
coupled to the driven gear and a planetary gear set coupled to the
5
driven wheel. These documents describe configurations to arrange the
gear train as wide as possible in the circumferential direction and
thus reduce the axial footprint of the assembly.
[0018]. Other such solutions are known from US8051957B2,
WO2011076299A1, WO2015151052A1, WO2016005867A2, US2005034936A1,
US2008271553A1.
[0019]. All these solutions, however, do not allow to reduce the
axial volume of the caliper mainly due to the side-by-side
arrangement of the piston and worm-nut screw assembly and the
gearbox.
[0020]. Therefore, the need remains strongly felt for a caliper of
the type with a thrust device actuated through a screw-nut screw and
which has a reduced axial dimension.
[0021]. This need is also strongly felt for motorcycles on which
the axial dimensions of the caliper are a major constraint to the
desired reduced width of the vehicle itself, but especially to the
maneuverability thereof.
[0022]. Solution
[0023]. These and other objects are achieved by a caliper
according to claim 1 and by a brake according to claim 10.
[0024]. Some advantageous embodiments are the subject of the
dependent claims.
[0025]. This solution allows to significantly reduce the axial
dimensions of the caliper by virtue of the integration of its
components.
6
[0026]. By virtue of the suggested solutions, the components of
the reducer or gearbox are at least partially interpenetrated with
the components of the thrust device, allowing a significant
reduction in the size of the assembly, particularly in the axial
direction.
[0027]. The tests carried out on the solutions revealed that the
achieved reduction in the axial dimension could not have been
obtained in any of the previously known solutions.
[0028]. On the contrary, precisely because of the needs expressed
by these previously known solutions, i.e. to suggest modular
solutions in which the gearbox can be easily and simply separated
from the caliper body, the known solutions suggest assemblies which
are increasingly cumbersome in the axial direction, precisely
because of the refined desire to separate the components of the
thrust device from those of the gearbox or motor-gearbox.
[0029]. In particular, the design of the worm and the gearbox
supports is exemplified, to the point of eliminating the motion
transmission components from the gearbox to the worm, by directly
using the worm support bearing to transmit motion from the gearbox
to the worm.
[0030]. Furthermore, by virtue of the suggested solutions, it is
possible to have a reduction in the number of components which form
the caliper. In particular, with this suggested solution, the
support bearing of the worm also incorporates the function of
supporting bearing of the gearbox or a proximal part of the gearbox,
7
further allowing to eliminate the number of components which allowed
the gearbox support bearing to be fitted.
[0031]. These solutions also allow a considerable simplification
of the caliper assembly step.
[0032]. Drawings
[0033]. Further features and advantages of the invention will
become apparent from the description provided below of preferred
embodiments thereof, given by way of non-limiting examples, with
reference to the accompanying drawings, in which:
[0034]. - figure 1 shows a circumferential view of a brake caliper
according to the invention;
[0035]. - figure 2 shows a section in a radial axial plane of the
caliper in figure 1;
[0036]. - figure 3 shows an enlarged detail of the section in
figure 2, in which the support bearing of the worm and the end part
of the gearbox are highlighted;
[0037]. - figure 4 shows a section view taken along line IV-IV in
figure 1 of the caliper in figure 1;
[0038]. - figure 5 shows an enlargement of a detail in Figure 4,
in which the support bearing of the worm and the end part of the
gearbox are highlighted.
[0039]. Description of some preferred embodiments
[0040]. According to a general embodiment, a brake caliper of a
disc brake 1 comprises a caliper body 2 adapted to be arranged
straddling a brake disc 3 to apply a braking action on a vehicle.
8
[0041]. Said brake disc 3 defining an axial direction A-A directed
either along or parallel to the rotation axis X-X of said brake disc
3; a radial direction R-R orthogonal to said axial direction A-A and
a circumferential direction C-C orthogonal to said axial A-A and
radial R-R directions, as well as a tangential direction T-T locally
orthogonal to said axial direction A-A and said radial direction R-R
and tangent to said circumferential direction C-C.
[0042]. Said caliper body 2 comprising at least one thrust device
housing 4 which accommodates a thrust device 5 adapted to apply a
bias on at least one brake pad 6 to abut said at least one brake pad
6 against the braking surfaces 7, 8 of said brake disc 3.
[0043]. Said thrust device 5 is operatively connected to a
translating screw nut 9; operatively connected to a worm 10; said
translating screw nut 9 is operatively connected to a worm 10; said
worm 10 is operatively connected to a reducer or gearbox 11.
[0044]. Said worm 10 is rotatably supported by a screw thrust
bearing 12 adapted to support in a rotatable manner said worm 10 and
to apply by said worm 10 an axial reaction, i.e. a direct reaction
mainly along said axial direction A-A.
[0045]. At least part of said pressure gearbox 11 placed near and
operatively connected to said worm 10 is rotatably supported by at
least one gearbox thrust bearing 12 adapted to support in a
rotatable manner said at least one part of said reduction gear 11
and apply for said at least one part of said reduction gear 11 a
radial reaction, that is a direct reaction mainly along said radial
9
direction R-R.
[0046]. Advantageously, said screw thrust bearing and said gearbox
thrust bearing are the same thrust bearing 12.
[0047]. By virtue of the provision of a single thrust bearing 12
to perform both the function of a worm support bearing and a gearbox
support bearing, for example, the felt need to simplify the
construction of this assembly and reduce its axial dimensions is
solved.
[0048]. According to a yet further general embodiment, a brake
caliper of disc brake 1 comprises a caliper body 2 adapted to be
arranged straddling a brake disc 3 to apply a braking action on a
vehicle.
[0049]. Said brake disc 3 defining an axial direction A-A directed
either along or parallel to the rotation axis X-X of said brake disc
3; a radial direction R-R orthogonal to said axial direction A-A and
a circumferential direction C-C orthogonal to said axial A-A and
radial R-R directions, as well as a tangential direction T-T locally
orthogonal to said axial direction A-A and said radial direction R-R
and tangent to said circumferential direction C-C.
[0050]. Said caliper body 2 comprising at least one thrust device
housing 4 which accommodates a thrust device 5 adapted to apply a
bias on at least one brake pad 6 to abut said at least one brake pad
6 against the braking surfaces 7, 8 of said brake disc 3.
[0051]. Said thrust device 5 is operatively connected to a
translating screw nut 9; operatively connected to a worm 10; said
10
translating screw nut 9 is operatively connected to a worm 10; said
worm 10 is operatively connected to a gearbox 11.
[0052]. Said worm 10 is rotatably supported by a screw thrust
bearing 12 adapted to support in a rotatable manner said worm 10 and
to apply by said worm 10 an axial reaction, i.e. a direct reaction
mainly along said axial direction A-A.
[0053]. At least part of said pressure gearbox 11 placed near and
operatively connected to said worm 10 is rotatably supported by at
least one gearbox thrust bearing 12 adapted to support in a
rotatable manner said at least one part of said reduction gear 11
and apply for said at least one part of said reduction gear 11 a
radial reaction, that is a direct reaction mainly along said radial
direction R-R.
[0054]. Said thrust bearing 12 comprises at least one inner
bearing ring or radially inner slewing ring 14, 15.
[0055]. Said gearbox 11 comprises an epicyclic gear 20.
[0056]. Said epicyclic gear 20 comprises a fixed gear or an
internally toothed body 17 which cooperates with at least one planet
gear 18, and wherein said at least one planet gear 18 is rotatably
supported about at least one planet gear pin 21.
[0057]. Said at least one planet gear pin 21 is operatively
connected to said at least one radially inner slewing ring 15 to
transmit the action of said gearbox 11 to said worm 10 by means of
said at least one radially inner slewing ring 15.
[0058]. According to an embodiment, said worm 10 is rotatably
11
supported only by said thrust bearing 12.
[0059]. According to an embodiment, said thrust bearing 12 is a
bearing of the oblique type adapted to support both loads directed
along the axial direction A-A and loads directed along the radial
direction R-R.
[0060]. According to an embodiment, said worm 10 is a
recirculating ball worm.
[0061]. According to an embodiment, said thrust bearing 12
comprises at least one radially inner slewing ring 14, 15.
[0062]. According to an embodiment, said gearbox 11 comprises at
least one epicyclic gear 20.
[0063]. Said epicyclic gear 20 comprises a fixed gear or an
internally toothed body 17 which cooperates with at least one planet
gear 18, and wherein said at least one planet gear 18 is rotatably
supported about at least one planet gear pin 21.
[0064]. Said at least one planet gear pin 21 is operatively
connected to said at least one radially inner slewing ring 15.
[0065]. According to an embodiment, said at least one radially
inner slewing ring 15 comprises at least onepin housing 23 and said
at least one pin housing 23 receives said at least one planet gear
pin 21.
[0066]. According to an embodiment, said at least one radially
inner slewing ring 14, 15 is connected to said worm 10.
[0067]. According to an embodiment, said worm 10 comprises a screw
shank 22; said at least one radially inner slewing ring 14, 15 is
12
connected to said screw shank 22 to transmit the action of said
gearbox 11 to said worm 10 by means of said at least one radially
inner slewing ring 14, 15.
[0068]. According to an embodiment, said worm 10 comprises a screw
shank 22; said at least one radially inner slewing ring 14, 15 is
keyed to said screw shank 22 to transmit the action of said gearbox
11 to said worm 10 through said at least one radially inner slewing
ring 14, 15.
[0069]. According to an embodiment, said gearbox 11 comprises at
least one epicyclic gear 20.
[0070]. Said epicyclic gear 20 comprises a fixed gear or an
internally toothed body 17 which cooperates with at least one planet
gear 18, and said at least one planet gear 18 is rotatably supported
about at least one planet gear pin 21.
[0071]. Said at least one planet gear pin 21 is supported by a
planet carrier disc.
[0072]. Said at least one radially inner slewing ring 15 is in one
piece with said planet carrier disc.
[0073]. According to an embodiment, said thrust bearing 12
comprises at least one outer bearing ring or radially outer slewing
ring 13.
[0074]. According to an embodiment, said radially outer slewing
ring 13 is connected to a first outer slewing ring housing 16
provided at least partly in said caliper body 2.
[0075]. According to an embodiment, said gearbox 11 comprises a
13
fixed gear or an internally toothed body 17 which cooperates with
rotating or planet gears 18; said fixed gear or internally toothed
body 17 is connected to said caliper body 2; said radially outer
slewing ring 13 is connected to a second outer slewing ring housing
19 at least partly provided in said fixed gear or internally toothed
body 17.
[0076]. According to an embodiment, thrust bearing 12 comprises at
least one radially inner slewing ring 14, 15.
[0077]. At least one radially inner slewing ring 14, 15 is in one
piece with said worm 10.
[0078]. According to an embodiment, said worm 10 comprises a screw
shank 22; said at least one radially inner slewing ring 14, 15 is in
one piece with said screw shank 22 to transmit the action of said
gearbox 11 to said worm 10 through said at least one radially inner
slewing ring 14, 15.
[0079]. According to an embodiment, said at least one radially
inner slewing ring 14, 15 is a first inner slewing ring 14 and a
second inner slewing ring 15 mutually side-by-side.
[0080]. According to an embodiment, said second inner slewing ring
15 is operatively connected to said gearbox 11.
[0081]. According to an embodiment, said gearbox 11 comprises at
least one epicyclic gear 20.
[0082]. Said second inner slewing ring 15 comprises at least one
pin housing 23 and said at least one pin housing 23 receives at
least one planet gear pin 21 which rotatably supports at least one
14
planet gear 18 of said epicyclic gear 20.
[0083]. According to an embodiment, said gearbox 11 is a part of a
ratio motor 24 which comprises an electric motor 25 operatively
connected to said gearbox 11.
[0084]. According to an embodiment, said brake caliper 1 is an
electrically actuated caliper.
[0085]. According to an embodiment, said thrust device housing 4
has an insertion opening 26, said insertion opening 26 opens towards
said gearbox 11 and allows the insertion in said pin device housing
4 of said thrust device 5 and/or of said translating screw nut 9 and
said worm 10.
[0086]. According to an embodiment, said thrust device 5 comprises
an inner thrust device chamber 28.
[0087]. Said inner thrust device chamber 28 accommodates said
translation screw 9 and said worm 10.
[0088]. According to an embodiment, a support ring 29 is
interposed between said thrust device 5 and said translation screw
9; and wherein said translating screw nut 9 rests on said resting
ring 29, so as to contain the clearance of said thrust device 5 and
of said translation screw nut 9.
[0089]. According to an embodiment, said translating screw nut 9
comprises at least one snap coupling device 30.
[0090]. According to an embodiment, said snap coupling device 30
snap-connects said translation nut screw 9 to said thrust device 5.
[0091]. According to an embodiment, said worm 10 comprises a screw
15
thrust head 27 adapted to cooperate either directly or indirectly
with said thrust device 5.
[0092]. According to an embodiment, a limit stop disc 31 is
provided interposed between said thrust device 5 and said screw
thrust head 27.
[0093]. According to an embodiment, said limit stop disc 31 is
shaped as a spherical cap 32.
[0094]. The present invention further relates to a disc brake 33
comprising a caliper according to any one of the embodiments
described above and associated with a brake disc 3.
[0095]. Those skilled in the art may make many changes and
adaptations to the embodiments described above or may replace
elements with others which are functionally equivalent in order to
meet contingent needs without however departing from the scope of
the appended claims.
[0096]. According to an embodiment, the thrust device 5 comprises
a retaining device 34 which can prevent the rotation of the thrust
device 5 in thrust device housing 4.
[0097]. According to an embodiment, a brake caliper 1 comprises a
caliper body 2 adapted to straddle the disc 3, wherein said caliper
body 2 comprises:
[0098]. - a first elongated portion 105 adapted to face a first
braking surface 106 of the brake disc 3, and
[0099]. - a second elongated portion 107, opposite to said first
elongated portion 105 and adapted to face a second braking surface
16
108 of the brake disc 3 opposite to said first braking surface 106,
and
[00100]. - at least one bridge 109 which connects said first
elongated portion 105 and said second elongated portion 107 to each
other arranged straddling the disc 3.
[00101]. Said brake caliper 1 further comprises at least one pair
of opposite brake pads, comprising a first brake pad 110 and a
second brake pad 120.
[00102]. Each brake pad 110, 120 of said at least one pair of
opposite brake pads comprises:
[00103]. - friction material 111, 121, and
[00104]. - a support plate 112, 122, which supports said friction
material 111, 121.
[00105]. Each support plate 112, 122 of each brake pad 110, 120
comprises a plate back 113, 123 facing a respective elongated
portion of said elongated portions 105, 107 of the caliper body 2.
[00106]. Said brake caliper 1 further comprises:
[00107]. - at least one thrust device 5, adapted to apply a thrust
action on said plate back 113 to abut said first brake pad 110 of
said pair of brake pads against a braking surface 106 of said facing
braking surfaces 106, 108 of the disc 3;
[00108]. - at least one detecting device 115, adapted to detect a
biasing force directed in axial direction X-X.
[00109]. Said detecting device 115 of the brake caliper 1 is
interposed either directly or indirectly between said plate back 123
17
of said second brake pad 120 of said pair of brake pads and an
elongated portion 107 of the caliper body 2, thus avoiding the
provision of a thrust device 5 interposed between said detecting
device 115 and said plate back 123 of said second brake pad 120 of
said pair of brake pads.
18
LIST OF REFERENCE SYMBOLS
1 brake caliper of a disc brake
2 caliper body
3 brake disc
4 thrust device housing
5 thrust device, e.g. a piston
6 brake pad
7 braking surface
8 braking surface
9 translating nut screw
10 endless screw or worm, e.g. with recirculating ball screw
11 reducer or gearbox
12 thrust bearing
13 radial outer slewing ring or outer bearing ring
14 first radially inner slewing ring or first inner bearing
ring
15 second radially inner slewing ring which supports planet
gear pins or second inner bearing ring
16 first outer slewing ring housing
17 fixed gear or an internally toothed body or ring gear
18 planet gears
19 second outer slewing ring housing
20 epicyclic gear
21 planet gear pin
19
22 screw shank
23 pin housings
24 ratio motor
25 electric motor
26 insertion opening
27 screw thrust head
28 inner thrust device chamber
29 X-X support ring brake disc rotation axis
30 snap engagement device
31 limit stop disc
32 spherical cap
33 disc brake
34 retaining device, e.g. anti-rotation device
105 first elongated portion
106 first braking surface
107 second elongated portion
108 second braking surface
109 at least one bridge
110 first brake pad
120 second brake pad
111 friction material
121 friction material
112 support plate
122 support plate
20
113 plate back
123 plate back
115 axial bias sensing device
A-A axial direction parallel to rotation axis
R-R radial direction orthogonal to rotation axis
C-C circumferential direction orthogonal to an axial direction
and radial directions
T-T tangential direction punctually orthogonal to a radial
direction and axial direction
21
WE CLAIM:
1. A brake caliper for disc brake (1) comprising:
- a caliper body (2) adapted to straddle a brake disc (3) to apply a
braking action on a vehicle;
- said brake disc (3) defining an axial direction (A-A) directed
either along or parallel to the rotation axis (X-X) of said brake
disc (3); a radial direction (R-R) orthogonal to said axial
direction (A-A) and a circumferential direction (C-C) orthogonal to
said axial (A-A) and radial (R-R) directions, as well as a
tangential direction (T-T) locally orthogonal to said axial
direction (A-A) and said radial direction (R-R) and tangent to said
circumferential direction (C-C);
- said caliper body (2) comprising at least one thrust device
housing (4) which accommodates a thrust device (5) adapted to apply
a bias on at least one brake pad (6) to abut said at least one brake
pad (6) against the braking surfaces (7, 8) of said brake disc (3);
wherein
- said thrust device (5) is operatively connected to a translating
screw nut (9); operatively connected to a worm (10); said
translating screw nut (9) is operatively connected to a worm (10);
said worm (10) is operatively connected to a gearbox (11);
and wherein
- said worm (10) is rotatably supported by a screw thrust bearing
(12) adapted to support in rotatable manner said worm (10) and to
apply for said worm (10) an axial reaction, i.e. a direct reaction
prevalently along said axial direction (A-A);
- at least part of said pressure gearbox (11) placed near and
operatively connected to said worm (10) is rotatably supported by at
least one gearbox thrust bearing (12) adapted to support in
rotatable manner said at least one part of said reduction gear (11)
and apply for said at least one part of said reduction gear (11) a
radial reaction, that is a direct reaction prevalently along said
radial direction (R-R);
22
said thrust bearing (12) comprises at least one radially inner
slewing ring (14, 15);
and wherein said gearbox (11) comprises an epicyclic gear (20); and
wherein
said epicyclic gear (20) comprises a fixed gear or an internally
toothed body (17) which cooperates with at least one planet gear
(18), and wherein said at least one planet gear (18) is rotatably
supported about at least one planet gear pin (21);
characterized in that
said at least one planet gear pin (21) is operatively connected to
said at least one radially inner slewing ring (15) so as to transmit
the action of said gearbox (11) to said worm (10) by means of said
at least one radially inner slewing ring (15).
2. A caliper according to the preceding claim, wherein
- said screw thrust bearing and said gearbox thrust bearing are the
same thrust bearing (12);
and/or wherein
said worm (10) is rotatably supported only by said thrust bearing
(12);
and/or wherein
said thrust bearing (12) is a bearing of the oblique type adapted to
support both loads directed along the axial direction (A-A) and
loads directed along the radial direction (R-R);
and/or wherein
said worm (10) is a recirculating ball worm.
3. A caliper according to any one of the preceding claims, wherein
said at least one radially inner slewing ring (15) comprises at
least a pin housing (23) and said at least one pin housing (23)
receives said at least one planet gear pin (21);
and/or wherein
said at least one radially inner slewing ring (14, 15) is connected
to said worm (10);
23
and/or wherein
said worm (10) comprises a screw shank (22); said at least one
radially inner slewing ring (14, 15) is connected to said screw
shank (22) so as to transmit the action of said gearbox (11) to said
worm (10) by means of said at least one radially inner slewing ring
(14, 15);
and/or wherein
said worm (10) comprises a screw shank (22); said at least one
radially inner slewing ring (14, 15) is keyed to said screw shank
(22) so as to transmit the action of said gearbox (11) to said worm
(10) through said at least one radially inner slewing ring (14, 15);
4. A caliper according to any one of the preceding claims, wherein
said gearbox (11) comprises an epicyclic gear (20); and wherein
said epicyclic gear (20) comprises a fixed gear or an internally
toothed body (17) which cooperates with at least one planet gear
(18), and said at least one planet gear (18) is rotatably supported
about at least one planet gear pin (21); and wherein
said at least one planet gear pin (21) is supported by a planet
carrier disc; and wherein
said at least one radially inner slewing ring (15) is in one piece
with said planet carrier disc.
5. A caliper according to any one of the preceding claims, wherein
said thrust bearing (12) comprises at least one radially outer
slewing ring (13);
said radially outer slewing ring (13) is connected to a first outer
slewing ring housing (16) provided at least partly in said caliper
body (2);
said gearbox (11) comprises a fixed gear or an inner toothed body
(17) which cooperates with rotating or planet gears (18); said fixed
gear or inner toothed body (17) is connected to said caliper body
(2); said radially outer slewing ring (13) is connected to a second
24
outer slewing ring housing (19) at least partly provided in said
fixed gear or inner toothed body (17).
6. A caliper according to any one of the preceding claims, wherein
The thrust bearing (12) comprises at least one radially inner
slewing ring (14, 15); and wherein
at least one radially inner slewing ring (14, 15) is in one piece
with said worm (10);
and/or wherein
said worm (10) comprises a screw shank (22); said at least one
radially inner slewing ring (14, 15) is integral with said screw
shank (22) so as to transmit the action of said gearbox (11) to said
worm (10) by means of said at least one radially inner slewing ring
(14, 15);
and/or wherein
said at least one radially inner slewing ring (14, 15) is a first
inner slewing ring (14) and a second inner slewing ring (15)
mutually side-by-side;
and/or wherein
said second inner slewing ring (15) is operatively connected to said
gearbox (11);
and/or wherein
said gearbox (11) comprises an epicyclic gear (20); and wherein
said second inner slewing ring (15) comprises at least one pin
housing (23) and said at least one pin housing (23) receives at
least one planet gear pin (21) which rotatably supports at least one
planet gear (18) of said epicyclic gear (20);
7. A caliper according to any one of the preceding claims, wherein
said gearbox (11) is a part of a ratio motor (24) comprising an
electric motor (25) operatively connected to said gearbox (11);
and/or wherein
said brake caliper (1) is an electrically actuated caliper.
25
8. A caliper according to any one of the preceding claims, wherein
said thrust device housing (4) has an insertion opening (26), said
insertion opening (26) opens towards said gearbox (11) and allows
the insertion in said pin device housing (4) of said thrust device
(5) and/or of said translating screw (9) and said worm (10);
and/or wherein
- said thrust device (5) comprises a thrust device inner portion
(28);
said thrust device inner chamber (28) accommodates said translating
screw (9) and said worm (10).
9. A caliper according to any one of the preceding claims, wherein
a support ring (29) is provided interposed between said thrust
device (5) and said translating screw (9); and wherein said
translating screw (9) rests on said resting ring (29);
and/or wherein
said translating screw (9) comprises at least one snap coupling
device (30); and wherein
said snap coupling device (30) connects by snapping said translating
screw (9) to said thrust device (5);
and/or wherein
said worm (10) comprises a screw thrust head (27) adapted to
cooperate either directly or indirectly with said thrust device (5);
and/or wherein
a limit stop disc (31) is provided interposed between said thrust
device (5) and said screw thrust head (27);
and/or wherein
said limit stop disc (31) is shaped as a spherical cap (32)
10. A brake disc (33) comprising a caliper according to any one of
the preceding claims and a brake disc (3).