FR2626231A1 - MECHANICAL BRAKE CIRCUIT FOR FLEXIBLE TYPE CABLE AND FLEXIBLE VEHICLE VEHICLE WITH LENGTH COMPOSITION SYSTEM - Google Patents

Abstract

The invention relates to brake circuits for vehicles. It relates to a braking circuit comprising a mechanism 10 for adjusting the mechanical linkage which comprises a conduit anchoring device 22 which is movable between two positions in which it fixes the conduit 18 or not, a return device 24 ensuring the permanent presence of a voltage in the central member 16 which can slide in the duct. The anchoring device 22 comprises at least one tooth which can penetrate between projections formed on the outside of the duct 18. Application to the braking circuits of motor vehicles.

Description

The present invention relates to a braking circuit

swimming of vehicle.

  Vehicle braking systems incorporating

  mechanical connections are already known. The mechanical links

  They are usually placed between a brake operating member and a wheel braking assembly for braking a wheel. Known mechanical connections are not always satisfactory because they do not usually include a game adjustment device in

  the overall assembly of the mechanical connection. A manual adjustment

  during vehicle assembly and manual adjustments.

  subsequent intervals at appropriate intervals of

  vehicle are both inconvenient and expensive. The links

  mechanical sounds comprising an automatic adjustment device

  of the mechanical link circuit in its

  together are already known, but they are not commonplace.

  used and their assembly is not easy. In addition,

  they can disturb the setting of the brake assembly

  wheel stroke, whether it is a braking

automatic or manual adjustment.

  The present invention relates to a braking circuit

  a vehicle that solves the aforementioned problems posed by known braking circuits of vehicles or

less that reduces the sharpness.

  Thus, the invention relates to a vehicle braking circuit comprising a brake actuating member, at least one wheel braking assembly for braking a wheel, and a mechanical connection for connecting the actuating member to The braking assembly, the mechanical linkage comprising a brake cable and a

  linkage adjustment mechanism, the brake cable com-

  an internal member that can slide axially in a conduit, the linkage adjustment mechanism comprising a conduit anchoring device which is movable from a first position in which it does not fix the conduit to a second position in which it fixes the conduit, and a return device for creating a tension in the internal member when the anchoring device is in the first position in which it does not fix the conduit, the anchoring device comprising at least one tooth for penetrate between projections formed outside the conduit. The vehicle braking circuit according to the invention has a number of advantages. First, the vehicle braking system can be easily installed and

  avoids costly manual adjustment when mounting the vehicle

  cule. Second, the vehicle braking system

  compensates for any variation in the length of the braking link

  swimming in the vehicle during the period of use of the vehicle. Thirdly, the braking circuit does not interfere with the adjustment of the wheel brake assembly whether the adjustment is manual or automatic. Fourth, the vehicle brake system eliminates the need for the use of duct stop restraint systems where conduit stops are mounted on vehicle parts because there is always a positive voltage in the body internal and a positive charge of

compression applied to the duct.

  In general, the brake actuator may be of known construction. The actuator is preferably a handbrake but it can also be

  a brake controlled by a pedal.

  Likewise, the wheel brake assembly is usually

  of known type and may be constituted by any one of the wheel brake assemblies currently

  available on the market. The brake system of vehicles

  usually consists of several sets of braking

  wheeling, depending on the number of wheels that need to be

  associated with the braking circuit according to the invention.

  The conduit anchoring device may comprise

  a frustoconical part which cooperates with a

  complement of a box in which the device for

  works, the cooperation of both parties

  causing the movement of the anchoring device

  to a position in which he fixes the conduit.

  The conduit may be flexible. It may be formed of one or more metal wires. When it consists of several wires, these are preferably interwoven. The vehicle braking circuit may include a friction device for transmitting

  from the sliding movement of the internal organ to the

  anchoring device, so that this anchoring device ensures

the fixation of the duct.

  The friction device may be a spring placed between the anchoring device and the internal member. other

  However, friction device types can be used

  ized. In a variant of the invention, the vehicle braking circuit comprises a friction device which

  is intended to cause a displacement of the device

  ducting of the first position to the second and vice versa, the vehicle braking circuit further comprising a stop device placed on the inner member and intended to ensure the return of the conduit anchoring device so that it is in contact with an end wall of the link adjustment mechanism in the position of

  rest of the vehicle braking circuit.

  The friction device can be placed between the anchoring device and the conduit. In a variant, the

  friction device can be placed between a

  a tube attached to the anchoring device and a prolongation

  more than one end of the duct.

  The return device used in the circuit of

  braking is usually a spring.

  Other features and advantages of the invention

  tion will become more apparent from the following description,

  Referring to the accompanying drawings: Fig. 1 is a schematic plan view of a vehicle braking circuit having a first link setting mechanism used with a pair of rear wheels of a vehicle; Figure 2 is a detailed sectional view of a second linkage control mechanism similar to the first one shown in Figure 1; FIG. 3 shows a third embodiment of a Y link adjustment mechanism.

  FIG. 4 represents a fourth embodiment of

  link setting mechanism;

  FIG. 5 represents a fifth embodiment of

  link setting mechanism;

  Figure 6 represents a sixth embodiment of

  link setting mechanism; and Figures 7, 8 and 9 represent different types

outer surface of the duct.

  Reference is first made to FIGS. 1 and 2; they

  represent a vehicle braking circuit-2 which

  carries a maneuvering member in the form of a manual lever 4. The vehicle braking circuit 2 comprises two

  wheel brake assemblies 6 for braking

  swimming on two rear wheels 8 of a vehicle.

  The vehicle braking circuit 2 is such that a mechanical connection 10 connects the handbrake 4 to the wheel brake assemblies 6. The mechanical connection 10 comprises a

  brake cable 12 and a mechanism 14 for adjusting the connection.

  The cable 12 of brake comprises an internal member 16

  which can slide axially in a conduit 18. The mechanism

  Link setting mechanism 14 is disposed at a first end of conduit 18 as shown. The other extremity

  duct 18 is connected to a yoke 20 which allows the ap-

  application of the braking force exerted on the brake a

  hand 4 also to the two braking sets 6.

  The linkage setting mechanism 14 comprises a conduit anchoring device 22 which is movable from a

  first position shown in Figure 2, in the

  it does not fix the conduit 18 at a second position in which it fixes the conduit 18. The linkage adjustment mechanism 14 also comprises a return device in the form of a spring 24 intended to create a tension in the organ 16 when the conduit anchoring device 22 is in the first position in which it does not

not fix the conduit 18.

  As can be seen more clearly in FIG. 2, the device 22 for anchoring the duct has teeth 26 which are intended to penetrate between projections 28 forming a

  the outside of the duct 18. The protrusions 28 have a configuration

  such that they allow the teeth 26 to position themselves

  between the projections 28 and to exit easily.

  a gap formed between these projections 28, while ensuring a good tightening when the teeth 26 penetrate between the projections 28. The anchoring device 22 has a frustoconical portion 30 which is in contact with a portion 32 of the housing. complementary form as clearly indicated

  Figure 2. Contact between the two complementary parties

  30, 32 causes a displacement of the device

  22 to a position in which it fixes the conduit 18, the teeth 26 being such that they moved

  in the spaces delimited between the projections 28.

  The conduit 18 is flexible so that it can be

  directed by any desired location to the wheels of the vehicle

  cule. The conduit 18 is preferably made of metal wires

  intertwined to define the projections 28.

  The vehicle braking circuit 2 has a

  friction device 34 for enabling transmission of

  sliding of the inner member 16 to the device 22 anchoring the conduit so that the device 22 is attached to the conduit 18. As shown in Figure 2, the friction device 34 is formed by a curved passage disposed in a part 36 constituting an extension of the anchoring device 22. When the internal member 16 is pulled in the direction of the arrow 38, a friction exists in the curved passage and the internal member 16 thus pulls the entire anchoring device 22 in the direction of the arrow 38. This causes the frustoconical portion 30 and the housing portion 32 to come into mutual contact. Since the anchoring device 22 is made of a flexible material,

  for example, a plastic material, the end of the

  An anchoring device 22 containing the teeth 26 flexes inwardly so that the teeth 26 penetrate between the projections 28. FIG. 1 shows an advantageous friction device 34 in the form of a spring 39 exerting a force

friction.

  During the operation of the vehicle braking circuit 2, the clearance in the internal member 16 and / or in any of the various mechanical links existing between the handbrake 4 and the wheel braking assemblies 6 is automatically removed. under the action of the spring 24 which maintains a substantially constant voltage in the inner member 16 when the device 22 for anchoring the conduit is in its first position shown in Figure 2, wherein it does not ensure the attachment. The spring 24 is in abutment at the left end, against a

  stop device 40 which is attached to the conduit 18. The

  fate 24 is in abutment, at its right end, against an end wall 42 of a housing 44 forming part of the linkage adjusting mechanism 14. The internal member 16 terminates in a yoke 52 connecting the lower end of the handbrake 4 around a pivot 54.

  4 pivots itself around a pivot 56.

  Reference is now made to Figure 3; it represents

  a link setting mechanism which has a function

  similarly to that of the adjustment mechanism shown in Figures 1 and 2. The analogous parts therefore bear the same numerical references which

  facilitate comparison and understanding. On the

  3, the friction device is formed by a leaf spring 58 which slides against the projections 28 formed outside the conduit 18. A guide member 60 which constitutes a part of the conduit anchoring device 22 is placed in position. With reference to the leaf spring 58, it can be seen in FIG. 3 that the anchoring device 22 moves from its position shown in FIG. 3, in which it does not provide fixation, and its fixing or anchoring position. in which the teeth 26 penetrate the defined spaces between the projections 28 of the duct 18, when the latter moves in the direction of the arrow 38. More specifically, the displacement of the duct 18 in the direction of the arrow 38 creates a friction between the spring & blade 58 and the guide member 60 so that the displacement of the conduit 18 is transmitted to the guide member 60 and consequently to the entire anchoring device 22. The displacement of the anchoring device 22 causes the setting

  contact of the frustoconical part 30 and the complementary part

  32, if the aforementioned anchoring action is ensured. Reference is now made to Figure 4; Parts similar to those of Figures 1 to 3 bear the same numerical references which facilitate comparison and understanding. In FIG. 4, the adjustment mechanism 14

  link to a different type of anchoring device 22.

  This anchoring device 22 has only one tooth 62 and it can pivot about a pivot 64. A spring 66 recalls the anchoring device 22 to the position shown in FIG. 4. A spring 68 is mounted between the device 22

  duct anchor and handbrake 4 so that the disc

  positive anchoring 22 can rotate in the direction of clockwise and can cause the setting of the tooth 62 in contact with the conduit 18 between the projections 28 of

  this one when the handbrake 4 is maneuvered.

  Regardless of the use of a single tooth 62 as shown in FIG. 4 or of several teeth as represented in FIGS. 1 to 3, it appears that the device 22 for anchoring the conduit can be positioned

  exactly at the required position along the duct 18.

  As can easily be appreciated by those skilled in the art, this allows the vehicle braking circuit 2 to be easily mounted and avoids expensive manual adjustments when

  vehicle assembly. In addition, the operation

  The mechanism of the linkage adjustment mechanism 14 does not interfere with the adjustment of the wheel brake assemblies 6, whether manual or automatic. The use of the spring 24 effectively ensures the permanent maintenance under tension of the internal member 16 which eliminates any play in the internal member 16 or in various connections forming part of the vehicle braking circuit 2 when the

  device 22 for anchoring the conduit is in position

not fixing.

  The linkage setting mechanism 2 shown in FIG. 5 is similar to the linkage adjustment mechanism shown in FIG. 3, but the right end of the

  FIG. 5 comprises an abutment member in the form of a

  In FIG. 5, the anchoring device 22 is tightened and loosened during operation of the duct transmitted by the coupling 58 to the anchoring device 22, so that the latter can come into cooperation with the duct by means of its means. teeth has a location near the beginning of the brake clamping stroke. This then causes the release of the teeth by the anchoring device when the conduit is towards the end of the loosening stroke

brake.

  FIG. 5 comprises the abutment device in the form of a friction coupling 70 acting on the cable 5 so that, at the beginning of each brake clamping stroke, the anchoring device 22 is repositioned if necessary on duct 18 and can be in contact with

  the end wall 42. The friction force of the

  is usually greater than the force of friction

coupling 58.

  The advantages of the linkage adjustment mechanism shown in FIG. 5 with respect to the mechanism of FIG. 3 are that the adjustment mechanism of FIG. 5 eliminates the need for prior positioning of a thrust member on the FIG. internal member 16 and has a less bulky embodiment. In addition, the linkage adjustment mechanism of Figure 5 is a particularly compact mechanism. The friction adjusting coupling 70 can also be used for adjusting the force applied to the brake lever by the spring

  24 when the control is in the rest position.

  Reference is now made to Figure 6; it represents

  a linkage setting mechanism having an accu-

  The linkage adjustment mechanism shown in FIG. 6 furthermore has a friction device 72 forming a duct clamp, mounted between a member 74 forming an extension of the duct 18, and a tube-shaped member 76 placed inside the anchoring device 22. The internal member 16 of the brake cable slides freely in the

extension 74.

  It should be noted in Figures 5 and 6 that the mechanisms

  The linkage arrangements shown are located in the middle of the braking cable, so that the conduit 18 is

  present on both sides of the linkage adjustment mechanisms

  his. Where appropriate, in variants, the adjustment mechanisms shown in FIGS. 5 and 6 may be

  mounted at one end of the conduit 18 of the braking cable.

  Figures 7, 8 and 9 are sections showing various types of duct 18 and various embodiments of the projections 28. The projections 28 shown in Figure 7 are similar but not quite identical to the projections 28 shown in Figures 1 to 4. Figures 8 and 9 show different projections, as shown in these figures.

  - It should be noted that the modes of realization of the

  described above with reference to the drawings

  For example, the parking brake 4 can be replaced by a brake pedal and a larger number of braking assemblies 6 can be used. The braking assemblies 6 can be mounted on the rear wheels of the vehicle, on the front wheels of the vehicle or on all the wheels of the vehicle. In addition, the vehicle can be of any desired type, for example a car, a van, a truck,

a bus or a bus.

  In alternative embodiments (not shown) lever return springs can be mounted on the

  cable so that the lever present in the brake assembly

  swim 6 back against his stop. In the absence of a satisfactory hump in the braking assembly 6, for contact with the lever, a stop may be mounted on the assembly comprising the cable so that the movement of

  return of the lever in the braking assembly 6 is limited.

REMMICATIONS

  Vehicle braking circuit, characterized in that it comprises a brake actuating member (4), at least one wheel braking assembly (6) for exerting a braking action on a wheel (8), and a mechanical connection (10) for connecting the operating member of

  braking (4) to the wheel brake assembly (6), the link

  its mechanism (10) comprising a braking cable (12) and

  a linkage adjusting mechanism (14), the brake cable

  swimming-pool (12) having an internal member (16) which can

  smooth axially in a conduit (18), the mechanism (10)

  linkage regulator comprising a device (22) for

  duct piercing which is movable from a first position in which it does not fix the duct (18) to a second

  position in which it fixes the conduit (18), and a

  positive return (24) for creating a tension in the inner member (16) when the conduit anchoring device (22) is in the first position in which it does not fix the conduit (18), the device ( 22) comprising at least one tooth (26) for penetrating between projections (28) formed outside the

led (18).

  2. Circuit according to claim 1, characterized in that the device (22) for anchoring a conduit has a part

  truncated cone (30) which is in contact with a complementary part

  enclosure (32) in which the device works

  duct anchoring, the cooperation of both parties

  (30, 32) causing the displacement of the

  conduit anchoring device to a position in which

he fixes the conduit.

  3. Circuit according to one of claims 1 and 2,

  characterized in that it comprises a & friction device (58) for permitting the transmission of the sliding movement of the inner member (16) to the conduit anchoring device (22), so that this anchoring device

fix the conduit.

  4. Circuit according to claim 3, characterized in that the friction device (58) comprises a spring placed between the conduit anchagi device and the internal member.

  Circuit according to one of Claims 1 and 2,

  characterized in that the vehicle braking circuit comprises a friction device (70) which is intended to cause a displacement of the conduit anchoring device from the first position to the second and vice versa, the vehicle braking circuit further comprising an abutment device on the inner member (16) for returning the conduit anchoring device (22) to engage an end wall portion of the adjustment mechanism Liaison

  rest position of the vehicle brake system.

  6. Circuit according to claim 5, characterized in that the friction device (70) is placed between the

  conduit anchoring device (22) and conduit (18).

  7. Circuit according to claim 5, characterized in that the friction device (70) is placed between a

  organ (76) in the form of a tube fixed to the device

  conduit casing and an extension member (74)

  duit protruding from one end of the duct.

  8. Circuit according to any one of the claims

  preceding, characterized in that the recall device

is a spring (24).