JPS6141025A - Disk brake - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a brake disc whose outer end is supported, a fixed brake carrier, and a pin guide for sliding the brake disc in the axial direction. A movably supported brake housing is provided, the brake housing being actuatable by an actuation device and spanning an inner end of the brake disc, the brake housing having first and second radially extending stems. and the first
and a bridge portion connecting the second stem and extending substantially in the axial direction, and a first brake lining supported on one side of the brake disc of the brake housing, the first brake lining being connected to the brake housing. A second brake lining is provided which is actuated by a first stem of the disc brake and which is supported on the other side of the brake disc in the brake carrier, the second brake lining relating to a disc brake which is actuated directly by an actuating device.

[Prior Art] In a disc brake often used in automobiles, a brake disc is supported at an inner end thereof, and an outer end of the brake disc extends along a brake housing. In this type of disc brake that spans the outside, the bridge part of the brake housing is placed between the outer end of the brake disc and the wheel rim, so the radius of the brake disc is limited. . Furthermore, this disc brake has the problem that its heat capacity increases in some cases.

The disc brake described in German Published Application No. 1.755.391 substantially eliminates the disadvantages of conventional disc brakes. The brake carrier is provided with two radially outwardly extending arms, the radially outer ends of these two arms being provided with extensions parallel to the axis, which extensions are connected to the inner end of the brake disc. and extends to the opposite surface of the brake disc.

The brake lining is provided with a plurality of radially outwardly extending projections by which the brake lining is supported within the brake carrier. A semi-cylindrical opening is formed in the protruding part of the brake lining and in a part parallel to the axis of the brake carrier, into which a holding member and an axially extending guide pin are inserted.

The brake housing is provided with a pair of lateral projections which are formed with a semi-cylindrical opening and which are guided by a retaining member and a guide pin. A problem with these disc brakes is that, when the brake is actuated, a vertical movement occurs, which imposes large stresses on the guide member, resulting in a considerable loss of guide surface and a significant loss of brake markings.

[Problems to be Solved by the Invention] An object of the present invention is to provide a disc brake that can reduce the stress applied to the guide member.

[Means for Solving the Problems] In the present invention, the pin guide includes a support pin in the form of a fixed bearing, and the support pin has a large circumferential direction transmitted to the support pin by the first brake lining via the brake housing. The support pin is fixed to either the brake carrier or the brake housing, and is engaged with the other of the brake carrier or the brake housing, and the support pin is arranged in the radial region of the brake disc. shall be. In the disc brake formed astride the interior in this manner, excessive stress is not applied to the guide member due to the circumferential force generated during brake operation.

According to an embodiment of the invention, a support pin is disposed on the rotational entry side of the brake disc in the main rotational direction. One brake lining located on the actuator side is supported directly in the brake carrier, and the other brake lining is supported in the brake housing, so that the force transmitted by the force of the brake lining is transferred to the support pin of the brake housing. The stress is transmitted through the brake carrier arm, which is placed on the rotational entry side in the main rotational direction, and the force transmitted by the internal brake lining is applied to the brake carrier arm, which is placed on the rotational entry side in the main rotational direction. It joins the brake carrier arm located at.

As a result, the force is advantageously distributed between the two brake carrier arms.

According to an embodiment of the invention, the support pin is provided on the brake carrier and extends generally away from the disc brake. A support pin is provided on the brake housing and extends generally in the direction of the brake disc. The brake carrier is therefore very close to the brake disc, so that stresses are further reduced.

In order to attach the brake carrier to a member fixed to the motor vehicle, such as a steering knuckle, the brake carrier is provided with three fixing points. In this brake carrier, the webs connecting the brake carrier arms are relatively small, so that they are not an important factor for determining the radial dimensions. The fixing points of the brake carrier arm disposed on the entrance side are arranged at equal positions from the center, and the two fixing points of the brake carrier are arranged at substantially equal positions from the center.

The connecting web is arcuate and arranged radially outward of the second stem of the brake housing.

In order to prevent the brake housing from rotating about the support pin due to residual torque, a rotation limiting device is provided between the brake housing and the brake carrier. This device is fitted with a pin or bushing fixed to the brake carrier or brake housing, which pin engages with play in a bore provided in the brake housing or brake carrier. In order to reduce the stress, an elastic brake member in the form of a rubber bushing is provided in a simplified manner, ie inserted into a bore in the brake carrier or in a bore in the brake housing and engaged by a pin or bushing.

Since the brake carrier is provided with a guide that opens outward in the radial direction, and the brake lining is accommodated and supported in this guide, the brake lining that is supported within the brake carrier can be easily inserted. To obtain the optimum shape of the brake housing in terms of weight and strength,
The radially inner side of the brake housing is formed with a corrugated profile, the tangent surface of which forms a radially outer convex surface.

In order to radially hold the internal brake lining associated with the actuating device, this brake lining is provided with a suitable element with an elastic element, which protrudes into the actuating device.

This elastic member has one shape.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 2 shows the internal structure of a disc brake 2 that is provided so as to straddle within a wheel 4 of an automobile. As shown in FIG. 2, the wheel 4 has a wheel rim 6 and a wheel dish 8.

Screw bolt 10 through this wheel dish 8
The wheel 4 is connected to the wheel bearing housing 12 by
is installed on. This wheel bearing housing 12 rotatably supports the wheel 4 via a bearing (not shown) on an axle spindle (not shown), which is connected to a steering knuckle. Wheel bearing housing 1
2 is provided with a flange 14, a first bore 16 is formed as a screw hole in this flange 14, and a screw bolt 10 is screwed into this first bore 16. A brake disc carrier 18 is attached to the flange 14 by screw bolts 10, and this brake disc carrier 18 is attached to the flange 14 and the wheel disc 8.
is placed between. Brake disc carrier 1
8 is provided with a substantially ring-shaped fastening section 20, a second bore 21 is formed inside the radial direction of this fastening section 20, and the screw bolt 10 is inserted through this second bore 21. is screwed into the first bore 16. Furthermore, the brake disc carrier 18 is provided with a carrier part 22 that runs along the wheel disc 8 . This carrier part 22 is formed with an end extending substantially parallel to the brake axle, onto which a coupling ring 24 is fastened. A friction ring 26 constituting a so-called brake disc is connected to the connection ring 24. The internally spanning disc brake 2 is provided with a brake housing 28, the longitudinal part of which is approximately U-shaped, and the brake housing 28 has first and second brake housings extending outwardly in the radial direction. Stem 30.
32 is attached, the first stem 30 and the second stem 32
are connected to each other via a bridge portion 34. A first brake lining 36 is disposed on one side of the friction ring 26, and a second brake lining 38 is disposed on the other side of the friction ring 26. A U-shaped brake housing 28 spans these first and second brake linings 36,38. In order to operate the disc brake 2, a cylinder bore 40 is formed in the second stem 32 disposed therein, and a piston 42 movable in the axial direction is accommodated in the cylinder bore 40. This piston 42 has a second piston located inside.
acts directly on the brake lining 38 of the piston 42
As a result of the reaction due to the movement of the brake housing 2
8 moves in the opposite direction to the piston 42 so that the first brake lining 36 arranged on the outside is acted upon.

As shown in FIGS. 1, 3, and 5, the brake housing 28 is supported for axial movement relative to a fixed brake carrier 44. As shown in FIGS.

The brake carrier 44 comprises first and second brake carrier arms 46.48 and a connecting web 50 which connects these first and second brake carrier arms 46.48 to each other and thus comprises a brake carrier arm 46.48. 44 has an arch shape as a whole. The brake carrier 44 is connected to the steering knuckle 52,
In order to connect to the steering knuckle 52, the brake carrier 44 is provided with three connection points. These connection points are located in the third bore 54 within the brake carrier 44. A fourth bore 56 and a fifth bore 58 are formed. The third and fourth bores 54 , 56 are arranged in a first brake carrier arm 46 , which is arranged on the rotational entry side of the friction ring 26 in the main direction of rotation. The fifth bore 58 is M
No. 2 brake carrier arm 48 is provided.

The fourth bore 56 disposed in the first brake carrier arm 46 and the fifth bore 58 disposed in the second brake carrier arm 48 on the rotation output side in the main rotation direction have the same circumference. placed above. third and fourth bores 54 located in first brake carrier arm 46;
．． 56 is arranged approximately on a line crossing the wheel axle.

Third, fourth and fifth bores 5 in brake carrier 44
Since a bore corresponding to 4.56.58 is provided in the steering knuckle 52, the brake carrier 44 and the steering knuckle 52 are connected by a screw (not shown).

As shown in FIG. 5, in order to slidably support the brake housing 28 in the axial direction, the brake carrier 44 is provided with a support pin 60 which is connected to the sixth bore 62 of the brake carrier 44. It is stored fixedly in the
This sixth bore 62 is provided in the first brake carrier arm 46 which is arranged on the rotational entry side of the friction ring 26 in the main rotational direction. The support pin 60 has a free end projecting from the sixth bore 62 and extending away from the friction ring 26 . The outer peripheral surface of this free end is formed as a guide surface 64, which is formed by a guide bore 66 provided in the brake housing 28.
Collaborate with. First annulus 68 with sixth bore 62 in brake carrier 44 and brake housing 28
A dust cover 72 is provided between the second ring portion 70 and the second ring portion 70 provided with the guide bore 66 in the dust cover 7 .
2 protects the guide surface 64.

An absorption device 74 is provided on the rotation output side in the main rotation direction,
During brake operation, this absorption device 74 can absorb moments that occur around the support pin 60. The absorption device 74 is provided with a short pin 76 which is screwed into the second brake carrier arm 48 and extends parallel to the support pin 60 in the direction away from the brake disc. Short pin 76 engages a seventh bore 78 provided within brake housing 28 . In this absorption device 74, the seventh bore 78 and the short pin 76 are arranged so that an annular space exists between the seventh bore 78 and the short pin 76.
6 is determined.

Since the annular space is provided with a rubber bushing 80, the movement of the short pin 76 that occurs within the seventh bore 78 when the brake is applied is absorbed. Instead of the rubber bushing 80, an absorbent member made of other materials that absorb motion can also be provided.

In order to support the second brake lining 38 in the brake carrier 44, the brake carrier 44 is provided with a guide 82, which guide 82 is bounded by first and second support surfaces 84, 86 in the circumferential direction. is attached. As shown in FIG. 5, a first support surface 84 is provided on the support pin 60 side, and a second support surface 86 is provided on the short pin 76 side. As shown in FIG. 2, the second brake lining 38 has a resilient tongue 8 for retaining the second brake lining 38 in the radial direction.
8 is provided, the resilient tongue 88 engaging the inner surface of the piston 42. To retain the first brake lining 36 on the first stem 30 of the brake housing 28, the first stem 30 is formed with two shoulders 90° 90, as shown in FIG. . Note that in FIG. 3, only one shoulder portion 90 is shown. Furthermore, the first
The brake lining 36 is provided with two axially extending lugs 92 , 92 on either side thereof, each lug 92 being supported by a respective shoulder 90 of the brake housing 28 . With such a configuration, the first and second play killers and innings 36, 38 can be easily inserted from the outside in the radial direction.

For this insertion, the brake housing 28 is first pushed inward (to the right in FIG. 2) so that the second brake lining 38 can be inserted.

Thereafter, the brake housing 28 is pushed outward again (to the left in FIG.
It can be inserted through an opening (not shown). Therefore, it is not necessary to remove the brake disc 26 when replacing the first and second brake linings 36, 38 arranged in the brake disc carrier 18.

As shown in FIG. 3, ribs 94 are provided in the region of the bridge portion 34 of the brake housing 28 and the radially inner portions of the first and second stems 30,32. The tips of the ribs 94 extend so as to form a virtual surface curved outward in the radial direction, so that the ribs 94 arranged on the outer side in the circumferential direction are the same as the ribs 94 arranged on the inner side in the circumferential direction. taller than. In this way, the region of the brake housing 28 to which a particular stress is applied is given a shape with a larger cross-sectional area.

Hereinafter, the operation of the disc brake 2 that straddles the inside will be briefly explained.

To actuate the disc brake 2, pressure medium enters the cylinder chamber 96 via a connection (not shown), as shown in FIG. As a result, the piston 42 moves in the axial direction toward the brake disc 26. This piston 42 presses the second brake lining 38 disposed inside against the brake disc 26 . Due to the reaction at this time, the brake housing 28 moves inward, that is, to the right in FIG. 2, and the first brake lining 36 disposed on the outside is pressed against the brake disc 26. When the brake is released, the cylinder chamber 96
Because the pressure therein is reduced and the rollback seal 98 is provided, the piston 42 is returned a small distance into the cylinder bore 98 and the second brake lining 38 is returned.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the internal structure of the disc brake, Fig. 2 is a sectional view of the disc brake shown in Fig. 1, and Fig. 3 is an external view with a part cut away of the disc brake shown in Fig. 1. , FIG. 4 is a bottom view of the disc brake, and FIG. 5 is a plan view of the disc brake. 26...Brake disc (friction ring), 28...
- Brake housing, 30...first stem, 32
...Second stem, 34...Bridge part, 36.
...First brake lining, 38...Second brake lineage, 44...Brake carrier, 60...
・Support pin. Applicant's agent Patent attorney Suzue Intent' Fig, 2 +I, l;I!

Claims (22)

[Claims] (1) A brake disc whose outer end is supported is provided, a fixed brake carrier is provided, a brake housing is provided that is slidably supported in the axial direction by a pin guide, and this brake housing is The brake housing is operable by an actuating device and spans the inner end of the brake disc, and the brake housing has first and second stems extending in a radial direction and connecting the first and second stems to form a substantially axially extending stem. a first brake lining having a bridge portion extending in a direction and supported on one side of the brake disc of the brake housing, the first brake lining actuated by a first stem of the brake housing; a second brake lining supported on the other side of the brake disc in the disc brake, the second brake lining being directly actuated by an actuating device, the pin guide having a support pin in the form of a fixed bearing;
This support pin absorbs the large circumferential force transmitted to the support pin via the brake housing by the first brake lining, and is fixed to either the brake carrier or the brake housing, and is fixed to either the brake carrier or the brake housing. Disc brake, characterized in that the support pin is arranged in a radial region of the brake disc. (2) The disc brake according to claim 1, wherein the support pin is disposed on the rotational input side of the main rotation of the brake disc. (3) The disc brake according to claim 1 or 2, wherein the support pin is provided on the brake carrier and extends substantially away from the disc brake. (4) The disc brake according to claim 1 or 2, wherein the support pin is provided in the brake housing and extends substantially in the direction of the brake disc. (5) The disc brake according to any one of claims 1 to 4, wherein the brake carrier is provided with first and second brake carrier arms. (6) The disc brake according to claim 5, wherein the first and second brake carrier arms are connected to each other via a connecting web. (7) The disc brake according to claim 6, wherein the connecting web is arch-shaped. (8) The disc brake according to claim 6 or 7, wherein the connecting web is disposed radially outside the second stem of the brake housing. (9) The brake carrier is provided with third, fourth, and fifth fixing points, and the member is fixed by these fixing points. The disc brake according to any one of the items above. (10) The third and fourth fixing points are provided on a first brake carrier arm, and the first brake carrier arm is arranged on the rotational input side of the brake disc in the main rotational direction. Claim No. 9
Disc brakes as described in section. (11) The disc brake according to claim 10, wherein the third and fourth fixing points provided on the first brake carrier arm are arranged at substantially equal positions from the center. (12) The disc brake according to any one of claims 9 to 11, wherein the fourth and fifth mounting locations are arranged at approximately equal positions from the center. (13) A device is provided between the brake housing and the brake carrier, and the device restricts rotational movement about the support pin when the brake is activated. The disc brake according to any one of the ranges 1 to 12. (14) A pin fixed to the brake carrier or brake housing is attached to the device, and the pin is engaged with a bore provided in the brake housing or brake carrier with play. A disc brake according to claim 13. (15) The disc brake according to claim 13 or 14, wherein the device is provided with an elastic braking member. (16) The elastic braking member is a rubber bushing, and the rubber bushing is inserted into a bore in the brake carrier or a bore in the brake housing and engaged by the pin. Disc brake according to item 15. (17) The brake carrier is provided with a guide that opens outward in the radial direction, and the second brake lining is housed and supported in the guide. The disc brake described in any one of Item 16. (18) The guide is formed by first and second support surfaces, and at least a portion of the first and second support surfaces are arranged in the region of the radial support pin. A disc brake according to claim 17. (19) The disc brake according to any one of claims 1 to 18, wherein a rib is formed on the radially inner side of the brake housing. (20) According to any one of claims 1 to 19, wherein an arch-shaped curved surface protruding radially outward is formed on the radially inner side of the brake housing. Disc brakes as stated. (21) The second brake lining disposed on the operating side is provided with a stop member, and the stop member is inserted into and engaged with the radial piston. 20. The disc brake according to any one of item 20. (22) The disc brake according to claim 21, wherein the stop member is a key-shaped member provided with an elastic tongue.