JP2018012429A - Foot operated parking brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foot operated parking brake device having a function to prevent a brake pedal from unintentionally returning without impairing operability and operational feeling.SOLUTION: A foot operated parking brake device 1 becomes in a braked state when a brake pedal 111 for parking is depressed by a foot to turn a pedal arm 11 for parking, a turned attitude of which is then held by a lock mechanism. When the brake pedal 111 for parking is depressed by the foot again in the braked state, the lock mechanism is released to return the brake pedal 111 for parking to an initial attitude. The lock mechanism is pair of engagement means allocated to a lock plate 15 which is turned in parallel to the brake pedal 111 for parking, and to the brake pedal 111 for parking. The lock mechanism turns the lock plate 15 to release the engagement means when a main brake device 2 is operated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foot-operated parking brake device for a vehicle.

  In a foot-operated parking brake device for a vehicle, a lock mechanism holds a posture of a pedal arm that is rotated by depressing a brake pedal with a foot and enters a braking state. When the brake pedal is depressed again with the foot from the braking state, the lock mechanism is This is a parking brake device that is released and returns the pedal arm to the initial posture. The lock mechanism generally has a combination of a ratchet provided on the pedal arm and a pole provided on a bracket that supports the pedal arm. In particular, when the foot-operated parking brake device is applied to an industrial vehicle, a release means is required separately from the lock mechanism so that the brake is not carelessly released (Patent Document 1).

  The foot-operated parking brake device disclosed in Patent Document 1 is for industrial vehicles that require a release mechanism different from the lock mechanism, and engages with a part of the pedal arm in a braking state to restrict rotation in the return direction. An auxiliary lock mechanism is provided, and a release pedal for releasing the auxiliary lock mechanism is disposed in the vicinity of the parking pedal (Patent Document 1 [Claim 1]). Although Patent Document 1 does not disclose a specific locking mechanism, it can be considered as a combination of a ratchet and a pawl as described above (see Patent Documents 1 and [0003]).

  The auxiliary lock mechanism is pivotally attached to the lower part of the floor of the driver's seat, and is composed of a release link biased upward in the floor and a release pedal connected to the release link, and a distal end portion of the release link Projecting on the rotation trajectory of the engaging portion provided in a part of the pedal arm, and the tip of the release pedal is brought into contact with the driver's foot pad placed on the parking pedal when the lock is released. (Patent Document 1 [Claim 2]).

JP 2009-023366

  The foot-operated parking brake device disclosed in Patent Document 1 has an advantage that the brake is not inadvertently released even if a situation occurs in which only the pedal arm is pushed in the braking state by the auxiliary lock mechanism provided as the releasing means (Patent Document 1). [0017]). The foot-operated parking brake device provided with such releasing means is preferable from the viewpoint of fail-safe even in general vehicles. However, operating the auxiliary lock mechanism, regardless of the original driving operation or braking operation, has the problem of reducing the operability and operational feeling of the pedal arm with the foot, and cannot be applied as it is to general vehicles. .

  In particular, the specific foot-operated parking brake device disclosed in Patent Document 1 has a configuration in which a release pedal protrudes from the floor on the front side of the brake pedal, and reduces the operability and operational feeling of the pedal arm. In the illustrated configuration, the release pedal is pushed with a heel to release the auxiliary lock mechanism, and the brake pedal is depressed with the foot as it is to release the lock mechanism. This is based on the premise that a saddle is put on the release pedal. If no hook is put on the release pedal, the brake pedal is not released from the posture holding. This means that there is a restriction on how to place the foot to release at least the braking state, and the operability of the releasing means is impaired.

  Further, if the kite is placed on the release pedal in a natural posture, the kite will also be placed on the release pedal when the brake pedal is depressed to achieve a braking state. The release pedal is configured to be pushed into the lower part of the floor. As a result, when the brake pedal is depressed to bring it into a braking state, the heel placed on the release pedal sinks, creating a sense of incongruity in the depression of the brake pedal, and impairs the operability of the foot-operated parking brake device.

  As described above, it is preferable to provide an auxiliary lock mechanism as a release means for releasing the brake in consideration of fail-safe of the stepping parking brake device. However, it is not preferable to reduce the operability and operational feeling of the foot-operated parking brake device by providing the release means regardless of the original driving operation and the braking layer, and it is particularly difficult to apply to a general vehicle. In view of this, the present inventors have studied to provide a foot-operated parking brake device having a function of preventing inadvertent return of the brake pedal without impairing operability and feeling of operation.

  What was developed as a result of the study was that the lock mechanism held the posture of the pedal arm that was rotated by depressing the brake pedal with the foot and entered the braking state, and when the brake pedal was depressed again with the foot from the braking state, the lock mechanism was released. In the stepped parking brake device for returning the pedal arm to the initial posture, the lock mechanism is a pair of engaging means assigned to the lock plate and the pedal arm that rotate in parallel with the pedal arm, and the main brake device A foot-operated parking brake device that releases the engaging means by rotating the lock plate by an operation. The foot-operated parking brake device of the present invention uses a lock mechanism that is released by operating the main brake device. The operation of the main brake device means an operation of applying a brake (braking operation) by the main brake device, and the main brake device is usually a stepping type, and therefore it corresponds to depressing the brake pedal of the main brake device.

  The lock plate preferably has a lock rotation means that always rotates toward the pedal arm, and a release rotation means that rotates away from the pedal arm only when the main brake device is operated. The lock plate always rotates in a direction approaching the pedal arm by the lock rotation means. For this reason, when the pedal arm that is turned by stepping on the brake pedal is pushed in, the pedal arm and the lock plate engage with each other. The hooking means is configured, for example, by assigning a combination of pins and hooks to both. When the main brake device is operated, the lock plate engaged with the pedal arm is moved away from the pedal arm by the release rotation means, and the engagement means is released.

  The lock plate is rotatable by passing a plate rotation shaft fixed to the vehicle body through the long hole, and the lock rotation means applies the plate rotation shaft to the end of the long hole near the pedal arm. In a configuration in which the urging force that rotates the lock plate toward the pedal arm is applied to the lock plate in the contact state, the release rotation means has the plate rotation shaft in contact with the end of the long hole near the pedal arm. In this state, the lock plate cannot be rotated, and the plate rotation shaft is in contact with the end of the elongated hole far from the pedal arm, and the lock plate is rotated so as to be away from the pedal arm according to the operation amount of the main brake device. It is preferable that the pulling force to be moved is applied to the lock plate.

  The lock rotation means applies an urging force to the lock plate to rotate toward the pedal arm no matter where the plate rotation axis is in the long hole. If the lock plate is not engaged with the pedal arm, the plate rotation shaft is brought into contact with the end of the elongated hole close to the pedal arm by the biasing force of the lock rotation means, and if the lock plate is engaged with the pedal arm, the lock rotation means is attached. The plate rotation shaft is brought into contact with the end far from the pedal arm of the long hole against the force. The release rotation means rotates the lock plate so as to move away from the pedal arm only when the plate rotation shaft is in contact with the end of the long hole far from the pedal arm, that is, when the lock plate and the pedal arm are engaged with each other. .

  Specific examples of the lock rotation means include a coil spring that spans from the end of the long hole near the pedal arm to the position close to the pedal arm and the vehicle body in the extending direction of the long hole. The “vehicle body” that bridges the coil spring includes a vehicle body, a bracket that supports a pedal arm with respect to the vehicle body, and the like. The coil spring is bridged from the end of the long hole to the pedal arm in the extending direction of the long hole from the end close to the pedal arm of the long hole. An urging force for rotating the pedal arm toward the pedal arm can be applied to the lock plate.

  The specific releasing rotation means may be configured such that a position orthogonal to the long hole and a cable extending from the main brake device are connected from an end of the long hole close to the pedal arm. If the lock plate is pulled when the main brake device is operated, the cable transmits a pulling force according to the operation of the main brake device to the lock plate. Since the cable is connected from the end close to the long hole pedal arm to the position perpendicular to the long hole, even if the cable is pulled with the plate rotating shaft in contact with the end close to the long hole pedal arm, the lock plate However, when the plate rotation shaft is in contact with the end far from the long pedal arm, it can be pulled away from the plate rotation shaft, so the lock plate is rotated. be able to.

  Here, if the cable extending from the main brake device pulls the lock plate directly, there is a risk that the lock plate and the pedal arm will be impacted depending on the operation of the main brake device, causing damage to each part and a feeling of strangeness on the foot of the brake pedal. is there. Therefore, it is preferable that the release rotation means has a configuration in which a position perpendicular to the long hole and a cable extending from the main brake device are connected via a coil spring from an end of the long hole close to the pedal arm. The coil spring gently transmits to the lock plate while absorbing the impact when the cable is suddenly pulled or loosened by expansion and contraction.

  In the foot-operated parking brake device of the present invention, since the lock mechanism can be released by operating the main brake device by using the main brake device as the release means, there is no restriction on how to put the foot on the brake pedal, and the brake Since the heel of the foot on which the pedal is stepped can be placed on a stable floor, there is an effect that the operability and the operational feeling are not impaired. Moreover, since the braking by the main brake device is always effective when the parking brake is released, there is an advantage that the vehicle does not move carelessly and is excellent in safety. As a result, the present invention can be used not only for industrial vehicles that require fail-safety but also for general vehicles.

  The lock mechanism of the present invention can be released by depressing the brake pedal only when the main brake device is operated, thereby eliminating inadvertent brake release. The lock plate whose plate rotation shaft moves through the long hole is released and rotated only when the plate rotation shaft is in contact with the end far from the pedal arm of the long hole, while being urged by the lock rotation means. The lock mechanism in which the means is pulled limits the state in which the release rotation means acts on the lock plate, and has the effect of eliminating inadvertent braking release.

  The coil spring constituting the lock turning means and the cable constituting the release turning means are simple as a specific structure for applying an urging force and a pulling force to the lock plate, and guarantee a reliable operation. Here, if the cable constituting the release rotating means and the lock plate are connected via a coil spring, the impact caused by the cable tension is reduced and transmitted to the lock plate, so that the lock mechanism is broken upon release. Eliminate fears.

1 is a left side view of a foot-operated parking brake device to which the present invention is applied. It is a right view of a stepping type parking brake device to which the present invention is applied. FIG. 6 is a left side view of the foot-operated parking brake device in a state immediately before the parking brake pedal is depressed to activate the lock mechanism. It is a left side view of a stepping type parking brake device in a state where a lock mechanism is activated and a parking pedal arm is held. FIG. 5 is a left side view of the foot-operated parking brake device in a state where the parking pedal arm is rotated to the limit without releasing the lock mechanism. FIG. 6 is a left side view of the foot-operated parking brake device in a state in which a lock mechanism is released by depressing a brake pedal for main brake of the main brake device. FIG. 5 is a left side view of the foot-operated parking brake device in a state where the parking pedal arm is returned to the initial posture with the lock mechanism released. FIG. 5 is a left side view of the foot-operated parking brake device in a state where the main brake pedal arm of the main brake device is also returned to the initial posture after the parking pedal arm.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. A foot-operated parking brake device 1 to which the present invention is applied includes an interlocking plate 12 that rotates together with a parking pedal arm 11 and a parallel movement with the parking pedal arm 11, as shown in FIGS. A lock mechanism is constituted by a pair of hooks 121 and pins 151 assigned to the lock plate 15 to be used, and the main brake device 2 is used as a release means of the lock mechanism. The main brake device 2 has a configuration in which, for example, a push cylinder connected to the main brake pedal arm 21 pushes a master cylinder that operates the main brake mechanism (not shown for convenience of explanation).

  The foot-operated parking brake device 1 of this example includes a mounting bracket 13 for a vehicle body, a parking pedal arm 11 pivotally attached to the mounting bracket 13, an interlocking plate 12 that moves with the parking pedal arm 11, and the mounting bracket 13 It is composed of a lock plate 15 and a brake lever 18 that are pivotally mounted on the shaft. The mounting bracket 13, the interlocking plate 12 and the lock plate 15, and the parking pedal arm 11 are each a flat metal plate, the left side of the mounting bracket 13 is parallel to the plane, and they are arranged with a space in front of each drawing. This prevents interference between the members. If there is no interference, for example, the parking pedal arm 11 and the interlocking plate 12 may be configured integrally. The brake lever 18 is disposed on the back side of the paper surface of FIG. 2 with the right surface of the mounting bracket 13 and the flange parallel to each other.

  The mounting bracket 13 is a metal plate having a rectangular shape when viewed from the side, and is fixed to the vehicle body (not shown) via a connecting portion (for example, a flange bent in a direction orthogonal to the plane of FIG. 1) protruding from the front edge in two steps. . The mounting bracket 13 is provided with a pedal rotation shaft 131 that protrudes in front of the paper surface in FIG. 1 in the vicinity of the middle of the upper edge, and opens a stopper guide 135 having an arc-shaped elongated hole that is concentric with the pedal rotation shaft 131. doing. The pedal pivoting shaft 131 pivots the parking pedal arm 11 that is attached to the mounting bracket 13 back and forth with the mounting bracket 13 parallel to each other. The stopper guide 135 is movably fitted within a range where the cylindrical block stopper 122 provided on the interlocking plate 12 contacts both ends of the inner peripheral edge.

  The mounting bracket 13 is provided with a plate rotation shaft 132 protruding in front of the paper surface in FIG. 1 in the vicinity of the middle of the front edge in the vicinity of the front edge sandwiched between the connection parts protruding in two upper and lower stages, and sandwiching the upper connection part Therefore, metal flanges that respectively constitute the bracket upper stage spring latching portion 133 and the bracket middle stage spring latching portion 134 are attached. The plate rotation shaft 132 rotates the lock plate 15, which is attached to the shaft, back and forth with the mounting bracket 13 parallel to each other. The bracket upper stage spring latching portion 133 latches one end of the pedal return coil spring 14 that applies an urging force to return the parking pedal arm 11 to the initial posture. Further, the bracket middle stage spring latching portion 134 latches one end of the lock rotating coil spring 16 serving as a lock rotating means.

  The parking pedal arm 11 is a metal plate having a substantially arc-shaped side view that is curved in the plane toward the rear (right side in FIG. 1) and convex toward the front (left side in FIG. 1). A parking brake pedal 111 is attached, and an arm-side spring hook 112 is provided at the upper end. The parking pedal arm 11 is pivotally attached to the pedal rotation shaft 131 and rotates back and forth. The arm side spring hooking portion 112 hooks the other end of the pedal return coil spring 14. As a result, the parking pedal arm 11 is pulled by the restoring force of the pedal returning coil spring 14 toward the bracket upper stage spring hooking portion 133 of the mounting bracket 13 to always return to the initial posture. Power is given.

  The interlocking plate 12 is a metal plate having a substantially arc shape in a side view, which is convex forward in the plane, opposite to the pedal arm 11 for parking, and a hook 121 is formed at the lower end. A cylindrical block stopper 122 is provided to protrude. The interlocking plate 12 is pivotally attached to the pedal rotation shaft 131 and rotates back and forth in conjunction with the parking pedal arm 11. The stopper 122 moves along the inner peripheral edge of the stopper guide 135 of the mounting bracket 13 to stabilize the rotation of the interlocking plate 12, and restricts the rotation range of the interlocking plate 12 to a range where both ends of the inner peripheral edge abut. . The parking pedal arm 11 that is interlocked with the interlocking plate 12 is stabilized in rotation by the action of the stopper 122, and the rotation range is limited.

  The lock plate 15 is a metal plate that is bent in a side view, with the front half of the plane extending back and forth and the rear half of the plane descending obliquely downward. A protruding pin 151 is provided, and a long hole 152 having an extending direction aligned in the front half extending in the front-rear direction is opened. The lock plate 15 passes through the plate rotation shaft 132 through the long hole 152, moves back and forth in parallel with each other in a range where it abuts on both ends of the inner peripheral edge of the long hole 152, and moves between the mounting bracket 13 and the flat surface. Rotate back and forth with parallel. The pin 151 is arranged to move so as to cross the trajectory on which the hook 121 of the interlocking plate 12 moves, and interlocks with the parking pedal arm 11 that rotates downward when the parking brake pedal 111 is depressed. The hook 121 of the interlocking plate 12 is engaged.

  The lock plate 15 is provided with a plate upper spring hooking portion 153 at the upper edge of the front half and a plate lower spring hooking portion 154 at the lower edge of the front half so as to sandwich the elongated hole 152. The plate lower spring latching portion 154 is located at a position perpendicular to the long hole 152 from the end (right end in FIG. 1) of the long hole 152 near the parking pedal arm 11 in the front half extending in the front-rear direction. One end of the coil spring 17 is hooked, and the cable 23 is connected via the release rotating coil spring 17. As a result, the restoring force of the release rotation coil spring 17 and the pulling of the cable 23 via the release rotation coil spring 17 are locked depending on which end of the elongated hole 152 the plate rotation shaft 132 is in contact with. Whether to rotate the plate 15 is selected.

  In the front half extending in the front-rear direction, the plate upper spring latching portion 153 is provided in the parking pedal arm 11 in the extending direction of the long hole 152 from the end (right end in FIG. 1) of the long hole 152 close to the parking pedal arm 11. The other end of the lock-rotating coil spring 16 is hooked. The lock-rotating coil spring 16 extends and contracts between the plate upper spring latching portion 153 and the bracket middle spring latching portion 134 of the mounting bracket 13. The lock plate 15 is pulled forward by the restoring force of the extending lock rotation coil spring 16 (moves to the left in FIG. 1), and the plate rotation shaft 132 is placed at the end of the long hole 152 close to the parking pedal arm 11. In a state in which the pin 151 is brought into contact, the pin 151 is rotated toward the parking pedal arm 11 so as to be close thereto.

  The brake lever 18 is a metal bracket having a U-shaped cross-section, and the flange is parallel to the plane of the mounting bracket 13, with the flange extending substantially in the middle in the pedal rotation shaft 131 and attached to one end. The connecting cable 181 is swingably connected, the stopper 122 of the interlocking plate 12 is connected to the other end, and the interlocking plate 12 is rotated via the interlocking plate 12 (see FIG. 2). When the parking brake pedal 111 is depressed, the brake lever 18 rotates in conjunction with the parking pedal arm 11 (counterclockwise in FIG. 2), lifts the connecting portion that allows the connecting cable 81 to swing, Pull the cable 181 (see Figure 4 and others below). Then, the connecting cable 181 pulls the two connection cables 183 via the equalizer 182 to operate the parking brake mechanism provided in each of the left and right rear wheels, thereby braking the left and right rear wheels.

  The main brake device 1 follows a conventionally known configuration. The main brake device 1 of this example is provided with an urging means (for example, a return spring or the like) for rotating the main brake pedal arm 21 for main brake, to which a push rod (not shown) is connected, toward the initial posture. Then, it is attached to the pedal rotation shaft 22 supported by the vehicle body (not shown). The main brake pedal arm 21 is a metal plate having a substantially arc-shaped side view that is curved in the plane toward the rear (right side in FIG. 1) and convex toward the front (left side in FIG. 1). A brake pedal 211 for the main brake is attached to the cable, and a cable connection 212 is provided at the upper end. The cable connecting portion 212 connects the other end of the cable 23 extending to the foot-operated parking brake device 1. The cable 23 is routed around the vehicle body and is provided with a cable end spring hooking portion 231 at one end exposed in the vicinity of the foot-operated parking brake device 1 and hooks the other end of the release rotation coil spring 17.

  The lock plate 15 is pulled by the cable 23 when the main brake brake pedal 211 of the main brake device 2 is depressed and the main brake pedal arm 21 rotates. At this time, if the plate rotation shaft 132 is in contact with the end of the elongated hole 152 close to the parking pedal arm 11 (the right end in FIG. 1), the lock plate 15 pulls the cable 23 or pulls the cable 23. It is not affected by the restoring force of the release rotating coil spring 17 that is extended by the rotation, and does not rotate.

  The release rotating coil spring 17 absorbs an impact caused by the depression of the main brake brake pedal 211 or the return of the initial posture, and does not apply the impact to the lock plate 15. On the other hand, if the plate rotation shaft 132 is in contact with the end (left end in FIG. 1) of the long hole 152 that is far from the parking pedal arm 11, the lock plate 15 pulls the cable 23 or the cable 23. 1 is rotated counterclockwise in FIG. 1 by the restoring force of the release-rotating coil spring 17 that is extended by pulling, and the pin 151 is moved away from the hook 121 of the interlocking plate 12.

  The operation of the foot-operated parking brake device 1 of this example will be described. When the parking brake mechanism 1 is operated, the foot-operated parking brake device 1 depresses the main brake pedal 211 as shown in FIG. 3 (for convenience of explanation, the middle part of the parking pedal arm 11 is broken). With the pedal arm 21 being rotated, the parking brake pedal 111 is depressed to rotate the parking pedal arm 11. As a result, the brake lever 181 interlocked with the parking pedal arm 11 pulls the connection cable 183 to operate the parking brake mechanism. As shown in FIG. 4 (for convenience of explanation, the intermediate portion of the parking pedal arm 11 is broken), the interlocking plate 12 gets over the pin 151 of the lock plate 15. The hook 121 is engaged with the pin 151. Thus, the braking state of the foot-operated parking brake device 1 is maintained.

  In a state where the main brake pedal 211 and the parking brake pedal 111 are depressed, a restoring force is generated in the lock rotating coil spring 16 (see the black arrow of the lock rotating coil spring 16 in FIG. 3). The restoring force of the lock-rotating coil spring 16 tries to rotate the lock plate 15 counterclockwise. Further, the cable 23 is pulled by the main brake pedal arm 21 and the restoring force of the release rotating coil spring 17 that is extended by the pulling of the cable 23 (see the black arrow of the release rotating coil spring 17 in FIGS. 3 and 4). ) Is added to the lock plate 15. However, the pulling force of the cable 23 and the restoring force of the coil spring 17 for releasing rotation are directly below the plate rotating shaft 132, and in particular, the lock plate 15 is not rotated.

  When the parking brake pedal 111 is depressed prior to the main brake brake pedal 211, the parking pedal arm 11 causes the restoring force of the expanding pedal return coil spring 14 (the pedal return coil in FIG. 4). The spring 14 is slightly rotated counterclockwise in FIG. 4 toward the initial posture (see FIG. 1). As a result, the interlocking plate 12 interlocked with the parking pedal arm 11 is also slightly rotated, and the hook 121 pulls the pin 151 backward (rightward in FIG. 4). Thus, the lock plate 15 retreats (moves to the right in FIG. 4 and locks) until the plate rotation shaft 132 comes into contact with the end (left end in FIG. 4) of the long hole 152 far from the parking pedal arm 11. (See the white arrow on the left side of plate 15).

  Here, if the brake pedal 211 for main brakes is still depressed, the pulling force of the cable 23 and the restoring force of the coil spring 17 for releasing rotation remain large. Moreover, when the lock plate 15 is retracted, the plate lower spring latching portion 154 approaches the parking pedal arm 11 from the plate rotation shaft 132. As a result, the cable 23 is pulled or the restoring force of the release rotating coil spring 17 tries to rotate the lock arm 15.

  However, as long as the hook 121 and the pin 151 are engaged, the lock plate 15 does not rotate. Thus, as shown in FIG. 4, when the depression of the brake pedal 211 for the main brake is stopped, the restoring force of the cable 23 is reduced, and the restoring force of the coil spring 17 for releasing rotation is reduced. Besides being balanced, the hook 121 and the pin 151 are engaged with each other, so that the lock plate 15 stabilizes the posture and maintains the braking state.

  On the contrary, if the depression of the main brake brake pedal 211 is stopped prior to the parking brake pedal 111, the pulling force of the cable 23 and the restoring force of the coil spring 17 for releasing rotation are reduced. When the depression of the parking brake pedal 111 is stopped, the parking pedal arm 11 is moved to the initial posture by the restoring force of the pedal returning coil spring 14 (see the black arrow of the pedal returning coil spring 14 in FIG. 4). (See FIG. 1). As a result, the interlocking plate 12 interlocked with the parking pedal arm 11 is also urged, and the hook 121 pulls the pin 151 backward (rightward in FIG. 4).

  The lock plate 15 moves backward (moves to the right in FIG. 4, the lock plate 15 moves until the plate rotation shaft 132 contacts the end of the long hole 152 far from the parking pedal arm 11 (left end in FIG. 4). (See the white arrow on the left). In this way, the tension of the cable 23 and the restoring force of the coil spring 17 for releasing rotation and the restoring force of the coil spring 16 for locking rotation are balanced, and the engagement of the hook 121 and the pin 151 is combined, so that the lock plate 15 stabilizes the posture, Maintain the braking state.

  When the parking brake pedal 111 is depressed without depressing the main brake brake pedal 211 in the foot-operated parking brake device 1 maintaining the braking state, the middle portion of the parking pedal arm 11 is broken for convenience of explanation. ), The parking pedal arm 11 can be rotated forward until the stopper 122 of the interlocking plate 12 contacts the lower end (left end in FIG. 5) of the stopper guide 135 of the mounting bracket 13.

  As a result, the hook 121 of the rotating interlocking plate 12 temporarily moves forward with respect to the pin 151 fixed in position of the lock plate 15 with a stable posture, and the engagement is released. However, when the depression of the parking brake pedal 111 is stopped, the parking pedal arm 11 rotates toward the initial posture in accordance with the restoring force of the pedal return coil spring 14, and the hook 121 is engaged with the pin 151 again. Thus, the foot-operated parking brake device 1 cannot be released without the braking operation of the main brake device 1, that is, without depressing the brake pedal 211 for main brake.

  In the foot-operated parking brake device 1 that maintains the braking state, when the parking brake pedal 111 is depressed after the main brake brake pedal 211 is depressed, the intermediate portion of the parking pedal arm 11 is broken as shown in FIG. ), The braking state is released. The rotating main brake pedal arm 21 pulls the cable 23 and extends the release rotation coil spring 17 to generate a large restoring force (see the black arrow of the release rotation coil spring 17 in FIG. 6). The extension of the release rotating coil spring 17 absorbs an impact caused by the depression of the brake pedal 211 for the main brake, and does not apply the impact to the lock plate 15.

  Since the lock plate 15 abuts the plate rotation shaft 13 on the end of the long hole 152 far from the parking pedal arm 11 (the left end in FIG. 6), the cable 23 is pulled and the release rotation coil spring 17 is restored. As long as the hook 121 and the pin 151 are engaged, the posture of the lock plate 15 is maintained against the bias. Here, when the parking brake pedal 111 is depressed, the hook 121 and the pin 151 are disengaged, and the lock plate 15 responds to the bias applied by the pulling of the cable 23 and the restoring force of the coil spring 17 for release rotation. It rotates clockwise in FIG. 6 (see the white arrow in the vicinity of the pin 151 in FIG. 6).

  When the engagement of the hook 121 and the pin 151 is released in this way and the depression of the parking brake pedal 111 is stopped, as shown in FIG. 7, the parking pedal arm 11 which has no restrictions is used for returning the pedal. According to the restoring force of the coil spring 14, it rotates toward the initial posture. Thus, the braking state of the foot-operated parking brake device 1 is released. Finally, when the depression of the main brake brake pedal 211 is stopped, as shown in FIG. 8, the main brake pedal arm 21 also returns to the initial posture.

  At this time, the contraction of the release rotation coil spring 17 absorbs the impact caused by the return of the brake pedal 211 for the main brake, and does not apply the impact to the lock plate 15. Thus, as a result of the cable 23 being pulled and the restoring force of the coil spring 17 for releasing rotation weakened, the lock plate 15 causes the plate rotating shaft 132 to be used for parking the long hole 152 by the action of the restoring force of the coil rotating coil spring 16. It moves backward until it comes into contact with the end close to the pedal arm 11 (the right end in FIG. 8) (refer to the white arrow on the left side of the lock plate 15 in FIG. 6), and returns to the initial position. In this way, a series of release operations of the foot-operated parking brake device 1 is completed.

1 Foot-operated parking brake device
11 Parking pedal arm
111 Parking brake pedal
12 Interlocking plate
121 hook
13 Mounting bracket
131 Pedal rotation axis
132 Plate rotation axis
14 Pedal return coil spring
15 Lock plate
151 pin
152 long hole
16 Coil spring for lock rotation
17 Coil spring for release rotation
18 Brake lever 2 Main brake device
21 Pedal arm for main brake
22 Pedal rotation axis
23 Cable

Claims (6)

When the brake pedal is stepped on with the foot, the lock mechanism holds the posture and the lock mechanism maintains the posture. When the brake pedal is stepped on again from the brake state, the lock mechanism is released and the pedal arm returns to the initial posture. In the foot-operated parking brake device
The lock mechanism is a pair of engaging means assigned to the lock plate that rotates in parallel with the pedal arm and the pedal arm,
A foot-operated parking brake device that releases the engaging means by rotating the lock plate by operating a main brake device. 2. The stepping type of claim 1, wherein the lock plate includes a lock turning means for always turning toward the pedal arm and a release turning means for turning away from the pedal arm only when the main brake device is operated. Parking brake device. The lock plate is rotatable by passing the plate rotation shaft fixed to the vehicle body through the long hole,
The lock rotation means is configured to apply an urging force to the lock plate to rotate the lock plate toward the pedal arm in a state where the plate rotation shaft is in contact with the end of the long hole close to the pedal arm.
The release rotation means cannot rotate the lock plate with the plate rotation shaft in contact with the end of the long hole close to the pedal arm, and the plate rotation to the end far from the long hole pedal arm. The foot-operated parking brake device according to claim 2, wherein the lock plate is configured to apply a pulling force to the lock plate so as to move away from the pedal arm in accordance with an operation amount of the main brake device in a state where the shaft is in contact. 4. The foot-operated parking brake device according to claim 3, wherein the lock rotation means is a coil spring that spans a position closer to the pedal arm and a vehicle body in an extending direction of the long hole from an end of the long hole close to the pedal arm. The stepping type parking brake device according to any one of claims 3 and 4, wherein the release rotation means is configured to connect a position extending perpendicularly to the long hole from a end of the long hole close to the pedal arm and a cable extending from the main brake device. . The release rotation means has a configuration in which a position extending perpendicularly to the long hole and a cable extending from the main brake device are connected via a coil spring from an end of the long hole close to the pedal arm. Foot-operated parking brake device.

Images