CN1368921A - Operating mechanism for parking brake - Google Patents

Abstract

The invention relates to an operating mechanism for a parking brake in a vehicle comprising a toothed quadrant (5) which is mounted on bridge girder (2) of the vehicle body, a brake operating lever (4) connected to the bridge girder, a connector, which tenses a brake cable according to the displacement of the brake operating lever (4), a brake operating lever (4) and a locking paw (7) which cooperates with the toothed quadrant (5) and is connected to the break operating lever (4), a catch spring (11) for pretensing the hooked paw (7) in the direction of the toothed quadrant (5) and a rod (14) which can be actuated along the brake operating lever (4). The aim of the invention is to provide an operating mechanism which uses simple means for reducing the amount of noise created when the parking brake is pulled. This is achieved by a catch spring (11) embodied as a one-piece dual lever that faces away from the toothed quadrant (5). The rod (14) displaces the locking paw (7) into a disengaging position with the toothed quadrant (5) as a result of the pretensioning force exerted by the catch spring (11) only after said is actuated.

Description

Actuator for parking brake

technical field

The invention relates to an operating device for the parking brake of a motor vehicle, which comprises a toothed part arranged on the bridge bracket of the vehicle body, a brake lever connected to the bridge bracket, a The movement of the operating lever tightens the connecting device of the brake cable, a fixed detent provided on the brake operating lever, which interacts with the toothed part, a detent spring for A pretensioning force is applied to the fixed pawl in part direction, a pull rod that can be activated along the brake lever.

Background technique

In daily life, operating devices for parking brakes of motor vehicles are known, in which a fixed detent interacts with a push rod connected to the detent, by pressing the Push button to release the fixed catch in an axially movable manner. In this known arrangement, the spring acting on the push rod is at the same time a pretensioned element which engages the fastening catch with a toothed portion provided on the vehicle body. The pretension of the spring is to prevent unintentional release of the button, so that the pretension of the spring is substantially greater than the force required for holding the fixed catch against the toothed portion, but when the fixed catch is in contact with the tooth This creates a loud noise as the shaped parts engage or disengage.

European patent EP-A-0 351 131 describes a self-resetting manual parking brake in which a single piece of retaining catch for the handbrake applied state and a single piece for resetting the brake cable The catch is connected to the same shank on the handbrake lever, and the fixed catch, which is in the position of engaging the toothed surface of the bridge bracket, is pre-tensioned by the spring, and the bridge bracket is fixed on the vehicle body. The fixed detent is connected at its end away from the toothed surface to a spring-loaded actuated linkage, which is integral with the hand brake lever, and is secured through the linkage by pressing a button on the hand brake lever. The detent disengages from the toothed surface.

British patent GB-A-2 059 022 has introduced a kind of foot parking brake, and brake cable is fixed by foot brake lever, and this foot brake lever can be fixed on the vehicle body with respect to the bridge bracket Hinged, can be hinged with the toothed surface and connect a foot pedal on the foot brake lever, in order to lock the tensioned cable, a detent connected to the foot brake lever and tooth toothed surface, in which case, in order to actuate the catch so as to disengage it, said catch is operated at its end remote from the toothed surface by means of a lever connected to that end, and at the other end of the lever , that is, the end remote from the end connected to the detent, the lever is articulated to a push rod mounted on the pedal, and is also held in this way by a spring against the direction of actuation of the pedal, i.e. by Tilting movement, the pawl can only be disengaged from the toothed surface, said tilting movement is carried out simultaneously with the actuating push rod in the release direction of the pawl, with the presser pedal movement occurring in the pawl locking direction, the actuating foot Activate the brake lever.

EP-A-0 771 706 describes a manual parking brake for motor vehicles, in which the fixed pawl, hinged on the brake lever, consists of two elements, the fixed pawl sliding on the teeth The resulting return movement takes place on the first detent element, which is separated from the second detent element hinged on the actuatable linkage mechanism, while driving the linkage mechanism through the drive plate to ensure the first The detent element disengages the tooth. In this known operating device, a leg spring is provided which acts on the first pawl in the direction of engagement with the teeth fixed on the vehicle body, all these solutions are expensive, difficult to install and have a variety of components , especially the movable parts.

DE-A-195 38 108 describes a braking device in which a toothed rack connected to the manual brake lever interacts with a double lever-type detent, for locking the brake cable a U-shaped leaf spring Set on the detent lever facing the rack, the U-shaped leaf spring legs clamp laterally against the boundary surface of the rack, creating a frictional force at the end which enhances the force acting on the detent during tightening of the brake. Partially such as spring force on a short lever. In addition, a push rod moved under the influence of the movement of the pawl is articulated with the short lever in order to release the brake. The disadvantage of this parking brake is that the U-shaped leaf spring is prone to wear due to the friction generated, so that the corresponding braking force changes with the prolongation of the service life. In addition, foreign matter or similar objects may cause the spring to be blocked, which will cause the braking device to be inoperable. Also specifically leaf springs also result in too many parts.

GB-A-1 428 230 introduces a self-service manual parking brake, which utilizes a hydraulic brake support device to be self-help. To fix the pawl, the double lever type pawl engages with the engaging teeth of the toothed portion of the restraining wheel, and the compression spring acts on the pawl lever facing the toothed portion. In order to release the detent, a push rod is hinged, said push rod is integral with the brake lever, its front end is movably held in the longitudinal guide, its rear end has a slot that allows relative to the The hinge pin moves, mounting the pin on the brake lever. The rounded rear end of the push rod is used to operate an intermediate double lever whose end opposite the push rod is in contact with the rounded rear end of the push rod. At the same time there is a distance between the end of the double lever opposite the pawl and the pawl lever remote from the toothed portion to allow movement of the pawl when locked on the teeth of the toothed portion during use of the brake lever. Since the compression spring acts on the detent lever facing the toothed portion, a high spring force spring has been selected so that locking or braking noises can be clearly heard during use of the brake lever. Furthermore, due to the small distance between the rod away from the toothed part and the middle double lever, there is still a risk of noise being generated when the two aforementioned elements hit together. Due to the poor leverage ratio, it is difficult to release the detent, and the mutual optimum fit of the interacting elements is very complicated during installation.

Contents of the invention

The object of the invention is to provide an actuating device which, with simple assembly, ensures good noise reduction when the parking brake is applied.

The purpose of the invention can be achieved with a manipulating device according to the invention, wherein the catch spring is designed as a compression spring and is combined with the catch at the end away from the toothed part, the fixed catch is designed as a single piece of double lever, In the actuated state only, the linkage disengages the locked pawl from the toothed portion against the pretension of the pawl spring.

The operating device according to the invention reduces the breakaway force acting on the fixed pawl, and the noise caused when the brake lever is used, which can be seen as a function of the compression spring force, is correspondingly reduced. The noisy engagement of the meshing teeth is also reduced. In the case of ordinary parking brakes, the excessive noise produced by the mechanism indicates the occurrence of incongruous meshing teeth with noisy meshing. In the device of the present invention, inexpensive components are used. In this way , no separate noise insulation is required. At the same time it is possible to obtain an actuating force of predetermined magnitude on the push rod front button, which force is as low as possible for safety reasons, so that the actuating device according to the invention is preferably used for a manual parking brake.

According to the structure of the control device of the present invention, the following effects can be obtained. When the inseparable fixed detent is rotated, the disengagement from the linkage mechanism means that the linkage mechanism cannot move, thereby avoiding the vibration or visual appearance of the button arranged on the end face. perceivable movement. Overall, the driver is given the quiet mechanical properties of the actuating device.

Using the idea of a compression spring as the detent spring, the combination of the compression spring and the fixed detent is realized in a reliable and cost-effective manner, enabling the alignment to be accomplished with a simple means of holding the compression spring against one end of the housing. For mounting of the operating device, the housing is used to abut the compression spring. The slack of the compression spring can be limited by a stop for the compression spring or a stop for the fixed catch, so that, on the one hand, it is possible to maintain the desired position between the end of the linkage mechanism and the stop point of the fixed catch. The determined minimum distance, on the other hand, can be used as an idle travel of the linkage mechanism during activation of the linkage mechanism.

On the short bar of the fixed pawl facing the toothed part, an engaging piece is set, which does not necessarily have to be arranged longitudinally on the lever, but can also be set as a transverse projection capable of engaging with the toothed part, so that when When the engaging pieces are engaged, the brake lever is fixed in its use position, which has an angle between the use position and the release position.

Preferably, on the long rod that holds the catch away from the toothed portion, there is a stop point against which the end of the linkage is low only when manipulated to a certain extent, in which case, when not When operating, the end of the linkage mechanism is out of contact with this stop point, so that the fixed pawl is engaged with the toothed part only under the elastic force of the pawl spring. By this device, the parking brake can be released to a certain degree. degree, and then by ending the start, ensure that it can engage the toothed portion again without requiring the handbrake to fully return to its original position and apply the handbrake again. There is no snug connection between the linkage and the fixed catch, so that the two associated devices in the parking brake can be replaced independently of each other, simplifying installation.

The stop point is set on the side of the long lever of the fixed latch away from the toothed part, so that when the linkage mechanism is manipulated, the spring force of the latch spring and the spring force of the push rod spring basically point in the same direction, so when designing Also consider the direction of the applied spring force.

In the area of the linkage adjacent to the stop point, a guide is provided on the linkage along the brake lever, so that when the button is pressed, the impact movement of the linkage is guided in the direction of the fixed catch , directing the linkage mechanism to the stop point provided on the fixed detent. The guide preferably consists of a slot provided at the end of the linkage, into which a pin engages, preferably the slot is integrally formed on the linkage, securing the pin to the brake lever. The slot has a longitudinal axis substantially coincident with the strike direction of the linkage and substantially parallel to the main axis of the detent spring, which axes may also be laterally skewed relative to each other. The detent spring is preferably integrated with the end of the fixed detent lever so that during engagement with the teeth a relatively large spring travel is required to turn the fixed detent so that the engagement noise is unnoticeable.

The fixed catch can be produced cost-effectively so that it can be produced as a sheet metal extrusion, alternatively the fixed catch can be produced from injection molded plastic so that when the brake is activated the fixed catch slides on the toothed part , further reducing noise.

In addition to being provided with elements for applying and releasing the coupling, the actuating device also has a reset device for the coupling, which resets the brake cable, e.g. if the latter sags or is elongated for other reasons, causing the parking brake In the locked position where multiple fixed detents cannot be locked, the brake cable must be returned to its original state in order to secure the parking brake. For this purpose, the reset device preferably comprises a cable pulley, which can be acted on in the direction of use of the brake cable by means of a spring load, by means of toothed sections distributed in the circumferential direction and designed as inclined rods. The drive detent is connected to the brake lever and reverses the path of operation of the hand brake lever, utilizing a spring load. When the parking brake is released, the cable pulley ensures that the brake cable is tensioned.

The actuating device for a parking brake according to the invention can be used for both manual and foot-operated parking brakes.

Contrary to the design of the push rod and the fixed detent as two separate elements, an alternative is to structurally connect these two elements in order to simplify assembly. To achieve this, the push rod and the fixed catch can be designed as one integral element. Despite the monolithic design, according to the invention, the displacement of the fixed pawl relative to the linkage mechanism for the locking movement can be designed as a form-fitting connection, the pawl being in position due to the use of the brake lever. When the toothed portion moves up, the linkage does not follow the movement of the pawl during the rotation of the pawl. In this case, it is only necessary to overcome the spring force of the detent in relation to the generation of a slight noise. However, the two elements are connected in at least one snug manner so that when the linkage moves against the catch spring, it moves the fixed catch with it, thereby releasing the latch.

The linkage and the fixed catch are connected to each other by means of a slot on one of the two elements and a pin provided on the other element, the pin engaging the slot in such a way that, without moving the linkage, The fixed pawl is rotatable against the pretension of the pawl spring. In this connection, the groove may have a curved surface corresponding to the bending radius of the pin.

Description of drawings

Further advantages and features of the invention emerge from the dependent claims and the following description.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

Figure 1 shows a typical embodiment of a parking brake in a setdown position according to the invention in a partially cutaway perspective view;

Figure 2 shows the parking brake shown in Figure 1 during application of the brake lever;

Figure 3 shows the parking brake with the linkage shown in Figures 1 and 2 actuated.

Specific embodiments of the invention

FIG. 1 shows a part of a handbrake 1 having a bridge bracket 2 arranged for co-rotation with the vehicle body, to which bridge bracket 2 a brake lever 4 is articulated via a junction 3 . The bridge bracket 2 has circumferentially distributed teeth 5 arranged on an arc portion, and the center of the arc portion is the same point as the joint point 3 .

Via joint 6 , a pawl 7 is hinged to brake lever 4 , having a short stem 7 a facing tooth 5 and a long stem 7 b facing away from tooth 5 . On the front side of the short lever 7a is formed an engaging piece 8 which is to be engaged with the tooth 5 in order to fix the position of the handbrake 1 when the handbrake 1 is used. When the handbrake 1 is not in use, the engaging tab 8 rests in a region 9 which is arranged on the toothed portion extension and is recessed inwardly relative to the engaging position.

A protrusion 10 is formed on the side of the long rod 7b of the fixing pawl 7 facing the support bracket 2, and a compression spring 11, ie, a coil spring, is engaged with the protrusion 10. A compression spring 11 is mounted on the brake lever 4 in a fixed position and is located in the housing-shaped holder 12, and the compression spring 11 exerts a pretensioning force on the fixed pawl 7 in the engagement direction. On the surface of the long rod 7b facing away from the protrusion 10, a stop point 13 is provided which protrudes relative to the contour of the long rod 7b and has a semicircular outer contour.

The brake lever 4 also has a linkage 14 comprising a jack 15, in this way the jack is substantially axially arranged in the brake lever 4, i.e. When the button (not shown) at the front end of the rod 4 is pushed, the push rod 15 moves under the action of the spring element (not shown). The rear end of the ejector rod 15 comprises an axial guide 16 which is a groove 17 provided in the end region of the ejector rod 15 into which a pin 18 fits in the groove 17 thereby substantially defining the direction of the ejector rod 15. the axial manipulation path. The end face 19 limits the boundary of the push rod 15 behind the guide 16, when the fixed catch 7 is in the rest position, that is, when the engaging piece 8 rests in the region 9, between the end face 19 and the stop point 13 of the fixed catch 7 There is a slight gap 20 .

In order to prevent the stop point 13 of the fixed detent 7 from being in close contact with the end face 19 of the push rod 15 and to always have a gap 20 between the two, during the manipulation of the linkage mechanism 14, a short gap is provided by overcoming the gap. Empty travel, the gap is set in order to make the maximum deflection of the spring 11 limited by the stop block. The stopper can be arranged in the spring deflection area or in the range of the fixed detent 7, and also can act on the short rod 7a through the rest area 9 to limit the maximum deflection of the spring.

The operation of the parking brake according to the invention will be described below in conjunction with the different operating states of FIGS. 1-3.

Starting from the set down position of the handbrake 1 shown in Figure 1, by raising the brake lever, the brake cable directly or indirectly connected to the brake lever is tightened so that the brake cable connected to the brake lever The brake shoes or pads are brought into a braking position, for example against the rim of a motor vehicle wheel, preventing the wheel from turning. The connection device connecting the brake cable to the brake lever may include direct force transmission devices and power assist devices, in particular, the connection device is designed so that it can be automatically reset, and once the brake lever is applied, the tension is released. Transfer to the brake cable. Self-resetting connections of this type are well known and will not be discussed in detail.

When using the brake lever 4, the lever rotates around the joint 3 in the direction indicated by the arrow 21 and simultaneously moves the elements connected to it, specifically, the fixed catch 7, the linkage mechanism 14 and the spring 11 are opposite. Move on the bridge support 2 that is fixed on the car body. In this case, the fixed catch 7 turns around the joint point 6 as the engaging tab 8 of the fixed catch 7 slides over the circular part contour. The engaging piece 8 leaves the rest position in the region 9, and as the engaging piece 8 moves along the circular portion 5, the spring 11 is compressed, and at the end of the rotation along the arrow 21, the elastic potential energy of the spring is very large, thereby acting on the long rod 7b The elastic force on the spring presses the fixed detent 7. When the engaging piece 8 is located in the tooth groove between the two teeth 5, the brake lever 4 is locked, so that the brake lever 4 and the bridge bracket 2 and its There is an included angle between the teeth 5 . In FIG. 2 , the spring 5 is shown in a compressed state, and it can be seen that the gap 20 between the end face 19 and the stop point 13 has increased accordingly. The spring force required for locking is very small, and since the force acting on the teeth is small, the noise generated each time the engaging piece 8 is locked between the two teeth of the tooth 5 is attenuated and is not annoying . It should be pointed out that the long rod 7b is more helpful than the short rod 7a to realize this characteristic, and the movement of the long rod can be transmitted to the short rod with a relatively small elastic force, so that the engaging piece 8 is engaged with the tooth 5 .

In Fig. 3, by pressing the button arranged on the end surface, a strong compression spring is used to move the push rod 15 backwards, and the end face 19 of the push rod 15 is low against the stop point 13, so that the push rod 15 is against the direction of the spring 11. The spring force moves back, causing the catch 7 to move around the joint 6, in this way the pin 18 in the slot 17 is arranged near the front end of the slot 17. Due to this frictional connection between the push rod 15 and the fixed pawl 7, the engaging piece 8 disengages from the tooth 5 (or leaves the rest position 9, if the button is pressed when the handbrake is in the released position), by using the handbrake, The hand brake lever can be released as in the prior art. It should be considered that by making the stop point 13 a semicircular shape, when the push rod 15 touches the stop point 13, the end surface of the push rod 15 is always in contact with the stop point 13 along the tangential direction, ensuring that the stop point 13 Sliding over the end face 19 prevents tilting or jamming. If the button is released, the push rod 15 returns to the position shown in Figure 1, and due to the pre-tensioning force of the compression spring 11, the fixed pawl 7 enters the stop state around the bridge bracket 2 again, and in the rest position 9 of the released state, the teeth The shaped part 5 and the handbrake are in the released state.

The invention has been described above in connection with an exemplary embodiment in which the slot 17 provided on the plunger 15 is movable relative to the pin 18 fixed on the brake lever 4 . In addition to the conceivable reverse movement, it is also possible to set the pin 18 on the fixed catch 7 in such a way that there is no close connection between the two elements, only when the brake is actuated, the fixed catch 7 is connected to the connecting catch 7 . The lever mechanism 14 is frictionally connected.

The present invention has been described in great detail above, so various changes and modifications of the present invention will become apparent to those skilled in the art after reading and understanding this specification. So all such changes and amendments are also included in this invention, so they are within the scope of protection of the present invention.

Claims (21)

1. an operating control that is used for the parking brake of power actuated vehicle comprises:

One parts of tooth (5), it is set on the bridge support (2) of car body;

One brake activation lever (4), it is hinged on the bridge support (2);

One connecting device, it moves according to brake activation lever (4), makes the brake pull cable tension;

One fixed detents (7), its be hinged on that brake activation lever (4) is gone up and with parts of tooth (5) mutual action, a pallet spring (11) is used for applying pretension to fixed detents on the direction of parts of tooth (5);

One connecting rod mechanism (14), it can be handled along brake activation lever (4),

It is characterized in that:

Pallet spring (11) is compression spring and combines with fixed detents (7) at the end of fixed detents (7) away from parts of tooth (5), fixed detents is a double lever, and connecting rod mechanism (14) only makes fixed detents (7) combine with parts of tooth (5) disengaging against the pretension of pallet spring (11) at operation state.

2. one kind meets the described operating control of claim 1, it is characterized in that: fixed detents (7) has an abut (13) on its stock away from parts of tooth (7b), this abut is facing to an end of connecting rod mechanism (14), this end is away from the shank of brake activation lever, and this abut clashes into this end under operation state.

3. one kind meets the described operating control of claim 2, it is characterized in that: abut (13) is arranged on the side of stock (7b) of fixed detents (7), this side deviates from mutually with pallet spring (11).

4. one kind meets the described operating control of one of claim 1～3, it is characterized in that: fixed detents (7) is worked as meshing flake (8) at it in the face of having one on the quarter butt (7a) of parts of tooth (5), when this meshing flake (8) meshes with parts of tooth (5), brake activation lever (4) is fixed on its use location.

5. one kind meets the described operating control of one of claim 1～4, it is characterized in that: have an axially directed device (16) in the rear end of connecting rod mechanism (14).

6. one kind meets the described operating control of claim 5, it is characterized in that: this guides (16) is made up of the groove (17) that is formed on connecting rod mechanism (14) rear end, and the pin (18) that is fastened on the brake activation lever (4) is installed in this groove.

7. one kind meets the described operating control of claim 6, it is characterized in that: the longitudinal axis of pin (18) and the spindle axis of pallet spring (11) are substantially parallel.

8. one kind meets the described operating control of one of claim 1～7, it is characterized in that: connecting rod mechanism (14) comprises a push rod (15), guides this push rod with the mode of moving axially, and this push rod and button are rigidly connected.

9. one kind meets the described operating control of claim 8, it is characterized in that: push rod (15) and button bear the elastic force of compression spring continuously, and this spring is set at brake activation lever (4) and upward and against unclamping direction applies elastic force.

10. one kind meets the described operating control of one of claim 1～9, it is characterized in that: fixed detents (7) is designed to a kind of sheet metal rolled-up stock.

11. one kind meets the described operating control of one of claim 1～10, it is characterized in that: be provided with one and be used for the connecting device homing device.

12. one kind meets the described operating control of claim 11, it is characterized in that: the homing device that is used for connecting device comprises a cable pulley, pass through spring load, this cable pulley can play a role on the service orientation of brake pull cable, can be connected with brake activation lever (4) with the driving pallet that is designed to the tilting bar form by the parts of tooth that circumferencial direction distributes.

13. one kind meets the described operating control of one of claim 1～10, it is characterized in that: brake activation lever (4) is formed on the manual parking brake with handle.

14. one kind meets any one claim or 10 and 11 described operating controls in the claim 1～7, it is characterized in that: brake activation lever (4) is formed on the foot-propelled parking brake with stretcher.

15. one kind meets one of claim 1 or 4 or 8～14 described operating control, if relate to claim 1 or 4, it is characterized in that: connecting rod mechanism (14) structurally links to each other with fixed detents (7).

16. one kind meets the described operating control of claim 15, it is characterized in that: connecting rod mechanism (14) is an one-piece parts with fixed detents (7).

17. one kind meets claim 15 or 16 described operating controls, it is characterized in that: connecting rod mechanism (14) is made into integration with fixed detents (7).

18. one kind meets the described operating control of one of claim 15～17, it is characterized in that: by two elements (7,14) groove one of and be arranged on the pin of another element, connecting rod mechanism (14) is connected with each other with fixed detents (7), this pin combines with this mode with this groove, promptly under the situation that does not make connecting rod mechanism (14) motion, fixed detents (7) can be rotated against the pretension of pallet spring (11).

19. one kind meets the described operating control of claim 18, it is characterized in that: when connecting rod mechanism (14) when the release the brake direction moves, because adopt a kind of obedient body (form-fitting) mode, fixed detents (7) can be rotated against the pretension of pallet spring (11).

20. one kind meets the described operating control of one of claim 1～18, it is characterized in that: only pallet spring (11) applies reset force to fixed detents (7).

21. one kind meets the described operating control of one of claim 1～19, it is characterized in that: utilize the axial motion of connecting rod mechanism (14), fixed detents (7) is directly rotated.

Images