JP6796319B2 - Foot-operated parking brake device - Google Patents

Description

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

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

The foot-operated parking brake device disclosed in Patent Document 1 is for an industrial vehicle that requires a release means 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 arranged in the vicinity of the parking pedal (Patent Document 1 [Claim 1]). Although Patent Document 1 does not disclose a specific locking mechanism, it is considered to be a combination of a ratchet and a pole as described above (see Patent Document 1 [0003]).

The auxiliary lock mechanism is rotatably attached to the lower part of the floor of the driver's seat, and is composed of a release link urged upward on the floor and a release pedal connected to the release link, and the tip of the release link. Is projected onto the rotation locus of the engaging portion provided on a part of the pedal arm, and the tip portion of the release pedal is positioned so as to come into contact with the heel of the driver's foot placed on the parking pedal when the lock is released. It is arranged (Patent Document 1, [Claim 2]).

Japanese Patent Application Laid-Open No. 2009-023366

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

In particular, the specific foot-operated parking brake device disclosed in Patent Document 1 has a configuration in which the release pedal protrudes from the floor on the front side of the brake pedal, which reduces the operability and operability of the pedal arm. In the illustrated configuration, the release pedal is pushed with the heel to release the auxiliary lock mechanism, and the brake pedal is stepped on with the foot as it is to release the lock mechanism. This is based on the premise that the heel is placed on the release pedal, and if the heel is not placed on the release pedal, the posture holding of the brake pedal is not released. This means that there are restrictions on how to place the foot, at least in order to release the braking state, and the operability of the release means is impaired.

Also, if the heel rests well on the release pedal in a natural posture, the heel rests on the release pedal when the brake pedal is depressed to put it in a braking state. The release pedal is configured to be pushed down the floor. As a result, when the brake pedal is stepped on to bring the brake into a braking state, the heel placed on the release pedal sinks, creating a feeling of strangeness in stepping on the brake pedal, and impairing the operability of the foot-operated parking brake device.

As described above, in consideration of the fail-safe of the foot-operated parking brake device, it is preferable to provide an auxiliary lock mechanism as a release means for releasing the braking. However, it is not preferable to reduce the operability and operability of the foot-operated parking brake device by providing the release means irrespective of the original driving operation and the braking layer, and it is particularly difficult to apply it to a general vehicle. Therefore, in order to provide a foot-operated parking brake device having a function of preventing inadvertent return of the brake pedal without impairing operability and operability, a study was made.

As a result of the examination, the lock mechanism holds the posture of the pedal arm that is rotated by depressing the brake pedal with the foot and enters the braking state, and when the brake pedal is depressed again with the foot from the braking state, the lock mechanism is released. In the foot-operated parking brake device that returns the pedal arm to the initial posture, 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 plate rotation fixed in position on the vehicle body is provided with a lock rotation means that constantly 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 shaft is made rotatable by penetrating the long hole, and the lock rotating means pushes the lock plate toward the pedal arm with the plate rotating shaft in contact with the end of the long hole near the pedal arm. In the configuration in which the urging force to be rotated is applied to the lock plate, the release rotating means cannot rotate the lock plate with the plate rotating shaft in contact with the end near the long hole pedal arm. The lock plate is configured to give a pulling force to rotate the plate rotation shaft away from the pedal arm according to the operation amount of the main brake device in a state where the plate rotation shaft is in contact with the end far from the long hole pedal arm. It is a foot-operated parking brake device characterized in that the lock plate is rotated to release the engaging means only when the main brake device is operated. 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 braking by the main brake device (braking operation), and since the main brake device is also a foot-operated type, it corresponds to depressing the brake pedal of the main brake device.

The lock plate may be configured to include a lock rotating means that constantly rotates toward the pedal arm and a release rotating means that rotates away from the pedal arm only when the main brake device is operated. The lock plate is constantly rotated in the direction of approaching the pedal arm by the lock rotating means. Therefore, when the brake pedal is stepped on and the rotating pedal arm is pushed in, the pedal arm and the lock plate engage with each other by engaging means. The engaging means is configured by assigning, for example, a combination of a pin and a hook 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 rotating means, and the engagement means is released.

The lock plate is rotatable by passing the plate rotation shaft fixed in position to the vehicle body through the elongated hole, and the lock rotating means hits the plate rotating shaft at the end near the pedal arm of the elongated hole. The lock plate is configured to give an urging force to rotate the lock plate toward the pedal arm in contact with the pedal arm, and the release rotation means abuts the plate rotation shaft at the end close to the long-hole pedal arm. The lock plate cannot be rotated in this state, and it is rotated so as to move away from the pedal arm according to the operation amount of the main braking device in a state where the plate rotation shaft is in contact with the end far from the long hole pedal arm. It is preferable that the lock plate is provided with a pulling force to move it.

The lock rotating means gives the lock plate an urging force to rotate it toward the pedal arm no matter where the plate rotating shaft is in the elongated hole. If the lock plate is not engaged with the pedal arm, the plate rotating shaft is brought into contact with the end of the long hole near the pedal arm by the urging force of the lock rotating means, and if it is engaged with the pedal arm, the lock rotating means is attached. The plate rotation shaft is brought into contact with the end far from the long-hole pedal arm against the force. The release rotating 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 far from the long hole pedal arm, that is, when the lock plate and the pedal arm are engaged. ..

Specific examples of the lock rotating means include a coil spring that extends from an end close to the long hole pedal arm to a position closer to the pedal arm in the extending direction of the long hole and to the vehicle body. The "body" over which the coil spring is bridged includes a vehicle body, a bracket that supports the pedal arm with respect to the vehicle body, and the like. The coil spring is bridged between the vehicle body and the end of the long hole near the pedal arm to a position closer to the pedal arm in the extending direction of the long hole, so that the plate rotation shaft can be located anywhere in the long hole. The lock plate can be given an urging force to rotate toward the pedal arm.

The specific release rotating means may have a configuration in which a position orthogonal to the elongated hole and a cable extending from the main brake device are connected from an end close to the pedal arm of the elongated hole. When the lock plate is pulled by the cable when the main brake device is operated, the cable transmits the pulling force corresponding 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 a position orthogonal to the long hole, the lock plate can be pulled even if the plate rotation shaft is brought into contact with the end close to the long hole pedal arm. However, when the plate rotation shaft is in contact with the end far from the long-hole pedal arm, the lock plate can be rotated because it can be pulled away from the plate rotation shaft. be able to.

Here, if the cable extending from the main brake device pulls the lock plate directly, an impact may be applied to the lock plate and the pedal arm depending on the operation condition of the main brake device, which may damage each part or give a sense of discomfort to the foot stepping on the brake pedal. is there. Therefore, the release rotating means may have a configuration in which a position orthogonal to the elongated hole and a cable extending from the main brake device are connected via a coil spring from an end close to the pedal arm of the elongated hole. The coil spring gently transmits the impact when the cable is suddenly pulled or loosened to the lock plate while absorbing it by expansion and contraction.

In the foot-operated parking brake device of the present invention, by using the main brake device as a release means, the lock mechanism can be released by operating the main brake device, so that there are no restrictions on how to place the foot on the brake pedal, and the brake Since the heel of the foot on which the pedal is stepped on can be placed on a stable floor, there is an effect of not impairing operability and operability. Moreover, since the braking by the main braking device is always in effect when the parking brake is released, there is no risk that the vehicle will start moving carelessly, and there is an advantage that the safety is excellent. As a result, the present invention can be used not only for industrial vehicles that require fail-safe, 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, eliminating inadvertent braking release. The lock plate in which the 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 long hole pedal arm while being urged by the lock rotation means. The locking mechanism pulled by the means limits the state in which the releasing rotating means acts on the lock plate, and has the effect of eliminating inadvertent braking release.

The coil spring constituting the lock rotating means and the cable constituting the releasing rotating means are simple as a specific configuration for applying an urging force and a pulling force to the lock plate, and guarantee reliable operation. Here, if the cable constituting the release rotating means and the lock plate are connected via a coil spring, the impact due to the pulling of the cable is relaxed and transmitted to the lock plate, so that the lock mechanism is damaged at the time of release. Eliminate the fear.

It is a left side view of the foot-operated parking brake device to which this invention is applied. It is a right side view of the foot-operated parking brake device to which this invention is applied. It is a left side view of the foot-operated parking brake device in the state immediately before the lock mechanism is activated by depressing the parking brake pedal. It is a left side view of the foot-operated parking brake device in the state where the lock mechanism is activated and holds the parking pedal arm. It 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. It is a left side view of a foot-operated parking brake device in a state where the lock mechanism is released by depressing the brake pedal for the main brake of the main brake device. It is a left side view of the foot-operated parking brake device in the state where the parking pedal arm is returned to the initial posture in the state where the lock mechanism is released. It 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 following the parking pedal arm.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The foot-operated parking brake device 1 to which the present invention is applied rotates in parallel with the interlocking plate 12 that rotates together with the parking pedal arm 11 and the parking pedal arm 11, as seen in FIGS. 1 and 2, for example. The lock mechanism is composed of 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 means for releasing the lock mechanism. The main brake device 2 is configured to push the master cylinder that operates the main brake mechanism by, for example, a push rod connected to the main brake pedal arm 21 (not shown for convenience of explanation).

The foot-operated parking brake device 1 of this example includes a mounting bracket 13 to 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 consists of a lock plate 15 mounted on the pedal and a brake lever 18. The mounting bracket 13, the interlocking plate 12, the lock plate 15, and the parking pedal arm 11 are metal plates each having a flat surface. The left side of the mounting bracket 13 and the flat surface are parallel to each other, and they are arranged at intervals on the front side of each drawing surface. , Prevents interference between each member. If there is no such interference, for example, the parking pedal arm 11 and the interlocking plate 12 may be integrally configured. The brake lever 18 is arranged on the back side of the paper in FIG. 2 with the right side of the mounting bracket 13 parallel to the flange.

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 connection portion (for example, a flange bent in the direction orthogonal to the paper surface in FIG. 1) protruding in two upper and lower stages of the front edge. .. The mounting bracket 13 is provided with a pedal rotation shaft 131 projecting toward the front of the middle page of FIG. 1 near the middle of the front and rear near the upper edge, and opens a stopper guide 135 having an arcuate elongated hole concentric with the pedal rotation shaft 131. doing. The pedal rotation shaft 131 rotates the parking pedal arm 11 attached to the shaft back and forth with the mounting bracket 13 parallel to each other in a plane. The stopper guide 135 is movably fitted within a range in which the stopper 122 of the columnar block provided on the interlocking plate 12 abuts on both ends of the inner peripheral edge.

The mounting bracket 13 is provided with a plate rotation shaft 132 projecting toward the front of the middle page of FIG. 1 in the vicinity of the upper and lower middles near the front edge sandwiched between the connection portions projecting in the upper and lower stages, and is positioned to sandwich the upper connection portion. For this reason, the metal flanges that form the bracket upper spring hooking portion 133 and the bracket middle spring hooking portion 134 are attached. The plate rotation shaft 132 rotates the lock plate 15 mounted on the shaft back and forth with the mounting bracket 13 and the planes parallel to each other. The bracket upper spring hooking portion 133 hooks one end of the pedal returning coil spring 14 that gives a urging force to return the parking pedal arm 11 to the initial posture. Further, the bracket middle stage spring hooking portion 134 hooks one end of the lock rotating coil spring 16 which is a lock rotating means.

The parking pedal arm 11 is a metal plate having a substantially arcuate side view that is convex forward (left side in FIG. 1) with the lower end side curved toward the rear (right side in FIG. 1) in a plane at the lower end. 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 toward the bracket upper spring hooking portion 133 of the mounting bracket 13 by the restoring force of the extending pedal return coil spring 14, and always tries to return to the initial posture. Power is given.

Contrary to the parking pedal arm 11, the interlocking plate 12 is a metal plate having a substantially arcuate side view that is convex forward in a flat surface. A hook 121 is formed at the lower end, and the hook 121 is formed at the lower end, and is located near the middle of the bend in FIG. A cylindrical block stopper 122 is provided. 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 limits the rotation range of the interlocking plate 12 to a range that abuts on both ends of the inner peripheral edge. .. The rotation of the parking pedal arm 11 interlocking with the interlocking plate 12 is stabilized and the rotation range is limited by the action of the stopper 122.

The lock plate 15 is a metal plate having a curved side view in which the front half of the flat surface extends back and forth and the rear half of the flat surface descends diagonally downward, and is located at the lower end of the latter half descending diagonally downward, in front of the middle page of FIG. A protruding pin 151 is provided, and an elongated hole 152 having an extending direction is opened in the front half extending in the front-rear direction. The lock plate 15 allows the plate rotation shaft 132 to pass through the elongated hole 152 and moves back and forth in parallel with each other within a range of contact with both ends of the inner peripheral edge of the elongated hole 152, and also moves back and forth with the mounting bracket 13 and each other. Is parallel and rotates back and forth. The pin 151 is arranged so as to cross the moving trajectory of the hook 121 of the interlocking plate 12, and is interlocked 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 on the upper edge of the front half and a plate lower spring hooking portion 154 on the lower edge of the front half so as to sandwich the elongated hole 152. The lower spring hooking portion 154 of the plate is located at a position orthogonal to the elongated hole 152 from the end (right end in FIG. 1) of the elongated hole 152 near the parking pedal arm 11 in the front half extending forward and backward, and is used for release rotation. One end of the coil spring 17 is hooked, and the cable 23 is connected via the release rotation 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 or not to rotate the plate 15 is selected.

The spring hooking portion 153 on the plate upper side extends from the end of the elongated hole 152 near the parking pedal arm 11 (right end in FIG. 1) in the front half extending forward and backward in the extending direction of the elongated hole 152. It is located closer to the lock and hooks the other end of the lock rotation coil spring 16. The lock rotation coil spring 16 expands and contracts between the plate upper spring hooking portion 153 and the bracket middle stage spring hooking 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 located at the end of the elongated hole 152 near the parking pedal arm 11. The pin 151 is rotated toward the parking pedal arm 11 so as to bring the pin 151 closer to the parking pedal arm 11.

The brake lever 18 is a metal bracket having a U-shaped cross section, and in a posture in which the flange is parallel to the plane of the mounting bracket 13, substantially the middle of the extending direction of the flange is pivotally attached to the pedal rotation shaft 131, and at 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 connecting cable 181 is oscillated in conjunction with the parking pedal arm 11 via the interlocking plate 12 (see FIG. 2). When the parking brake pedal 111 is stepped on, the brake lever 18 rotates in conjunction with the parking pedal arm 11 (counterclockwise in FIG. 2), lifts the connecting portion that makes the connecting cable 81 swingable, and connects the connection. Pull the cable 181 (see Fig. 4 and others below). Then, the connecting cable 181 pulls the two connecting cables 183 via the equalizer 182, activates the parking brake mechanism provided on each of the left and right rear wheels, and applies braking to 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 main brake pedal arm 21 to which the push rod (not shown) is connected toward the initial posture. Then, the pedal 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 arcuate side view that is convex forward (left in FIG. 1) with the lower end curved toward the rear (right in FIG. 1) in a plane. The brake pedal 211 for the main brake is attached to, and the cable connection part 212 is provided at the upper end. The cable connection portion 212 connects the other end of the cable 23 extending to the foot-operated parking brake device 1. The cable 23 is routed inside the vehicle body, and a cable end spring hooking portion 231 is provided at one end exposed near the foot-operated parking brake device 1, and the other end of the release rotation coil spring 17 is hooked.

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 near the parking pedal arm 11 (right end in FIG. 1), the lock plate 15 may pull the cable 23 or pull the cable 23. It is not affected by the restoring force of the release rotation coil spring 17 that expands due to, and does not rotate.

The release rotation coil spring 17 absorbs the impact caused by the depression of the main brake brake pedal 211 and the return of the initial posture, and does not give the impact to the lock plate 15. On the other hand, in the lock plate 15, if the plate rotation shaft 132 is in contact with the end (left end in FIG. 1) far from the parking pedal arm 11 of the elongated hole 152, the cable 23 can be pulled or the cable 23 can be pulled. Due to the restoring force of the release rotation coil spring 17, which is stretched by the pulling of, the coil spring 17 rotates counterclockwise in FIG. 1 and moves away from the parking brake pedal 111, that is, the pin 151 moves 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 is activated, the foot-operated parking brake device 1 is used for the main brake by depressing the main brake pedal 211 as shown in FIG. 3 (for convenience of explanation, the intermediate portion of the parking pedal arm 11 is broken). With the pedal arm 21 rotated, the parking brake pedal 111 is depressed to rotate the parking pedal arm 11. As a result, the brake lever 181 linked to the parking pedal arm 11 pulls the connection cable 183 to operate the parking brake mechanism. The interlocking plate 12 rotated along with the parking pedal arm 11 and overcame the pin 151 of the lock plate 15 as seen in FIG. 4 (breaking the middle portion of the parking pedal arm 11 for convenience of explanation). The hook 121 is engaged with the pin 151. In this way, the braking state of the foot-operated parking brake device 1 is maintained.

When the main brake pedal 211 and the parking brake pedal 111 are depressed, a restoring force is generated in the lock rotation coil spring 16 (see the black arrow of the lock rotation coil spring 16 in FIG. 3). The restoring force of the lock rotation coil spring 16 tries to rotate the lock plate 15 counterclockwise. Further, the restoring force of the release rotation coil spring 17 that is stretched by the pulling of the cable 23 by the main brake pedal arm 21 or the pulling of the cable 23 (see the black arrow of the release rotation coil spring 17 in FIGS. 3 and 4). ) Adds to the lock plate 15. However, the restoring force of the coil spring 17 for pulling and releasing the cable 23 is directly below the plate rotation shaft 132, and does not particularly rotate the lock plate 15.

Then, when the depression of the parking brake pedal 111 is stopped prior to the main brake brake pedal 211, the parking pedal arm 11 expands the restoring force of the pedal return coil spring 14 (in FIG. 4, the pedal return coil). The spring 14 (see the black arrow) causes the spring 14 to be 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 also rotates slightly, and the hook 121 pulls the pin 151 rearward (to the right in FIG. 4). In this way, the lock plate 15 retracts until the plate rotation shaft 132 abuts on the end (left end in FIG. 4) far from the parking pedal arm 11 of the elongated hole 152 (moves to the right in FIG. 4 and locks). See the white arrow on the left side of plate 15).

Here, if the brake pedal 211 for the main brake is still depressed, the restoring force of the coil spring 17 for pulling and releasing the cable 23 remains large. Moreover, when the lock plate 15 is retracted, the spring hooking portion 154 on the lower side of the plate approaches the parking pedal arm 11 from the plate rotation shaft 132. As a result, the restoring force of the coil spring 17 for pulling and releasing the cable 23 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. In this way, as seen in FIG. 4, when the depression of the brake pedal 211 for the main brake is stopped, the restoring force of the coil spring 17 for pulling and releasing the cable 23 becomes small, and the restoring force of the coil spring 16 for locking rotation becomes smaller. In addition to being balanced, the lock plate 15 stabilizes the posture and maintains the braking state in combination with the engagement of the hook 121 and the pin 151.

On the contrary, when 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 release rotation coil spring 17 are reduced. Then, when the depression of the parking brake pedal 111 is stopped, the parking pedal arm 11 is in the initial posture due to the restoring force of the extending pedal return coil spring 14 (see the black arrow of the pedal return coil spring 14 in FIG. 4). It is urged toward (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 rearward (to the right in FIG. 4).

The lock plate 15 retracts until the plate rotation shaft 132 abuts on the end (left end in FIG. 4) far from the parking pedal arm 11 of the elongated hole 152 (moves to the right in FIG. 4, the lock plate 15). See the white arrow on the left side). In this way, the restoring force of the coil spring 17 for pulling and releasing the cable 23 and the restoring force of the coil spring 16 for locking rotation are balanced, and the hook 121 and the pin 151 are engaged to stabilize the posture of the lock plate 15. Maintain the braking state.

In the foot-operated parking brake device 1 that maintains the braking state, when the parking brake pedal 111 is depressed without depressing the main brake brake pedal 211, FIG. 5 (for convenience of explanation, the intermediate portion of the parking pedal arm 11 is broken. ), The parking pedal arm 11 can be rotated forward until the stopper 122 of the interlocking plate 12 comes into contact with 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 is temporarily separated forward from the pin 151 whose position of the lock plate 15 having a stable posture is fixed, 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 according to the restoring force of the pedal return coil spring 14, and the hook 121 is engaged with the pin 151 again. In this way, the foot-operated parking brake device 1 cannot be released without the braking operation of the main brake device 1, that is, the depression of the main brake brake pedal 211.

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

Since the lock plate 15 has the plate rotation shaft 13 in contact with the end far from the parking pedal arm 11 of the elongated hole 152 (the left end in FIG. 6), the cable 23 is pulled and the coil spring 17 for release rotation is restored. Although it receives a force, the posture of the lock plate 15 is maintained against the bias as long as the hook 121 and the pin 151 are engaged. Here, when the parking brake pedal 111 is stepped on, the hook 121 and the pin 151 are disengaged, and the lock plate 15 responds to the tension given by the pulling force of the cable 23 and the restoring force of the coil spring 17 for releasing rotation. It rotates clockwise in FIG. 6 (see the white arrow near pin 151 in FIG. 6).

When the parking brake pedal 111 is stopped from being engaged with the hook 121 and the pin 151 in this way, as shown in FIG. 7, the parking pedal arm 11 having no restrictions is used for pedal return. It rotates toward the initial posture according to the restoring force of the coil spring 14. In this way, 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, the main brake pedal arm 21 also returns to the initial posture as shown in FIG.

At this time, the degeneracy of the release rotation coil spring 17 absorbs the impact caused by the return of the main brake brake pedal 211, and does not give the impact to the lock plate 15. In this way, the restoring force of the coil spring 17 for pulling and releasing the cable 23 is weakened, and as a result, the lock plate 15 uses the restoring force of the coil spring 16 for locking rotation to park the plate rotation shaft 132 for the long hole 152. It retracts until it comes into contact with the end close to the pedal arm 11 (right end in FIG. 8) (see 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 shaft
132 Plate rotation shaft
14 Coil spring for pedal return
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 Main brake pedal arm
22 Pedal rotation shaft
23 cable

Claims (4)

The lock mechanism holds the posture of the pedal arm that is rotated by depressing the brake pedal with the foot and enters the braking state. When the brake pedal is depressed again with the foot from the braking 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.
The lock plate is fixed in position on the vehicle body by providing a lock rotating means that constantly rotates toward the pedal arm and a releasing rotating means that rotates away from the pedal arm only when the main brake device is operated. The plate rotation shaft is passed through the elongated hole to make it rotatable.
The lock rotating means has a configuration in which a urging force for rotating the lock plate toward the pedal arm is applied to the lock plate in a state where the plate rotating shaft is in contact with the end of the long hole near the pedal arm.
The release rotating means cannot rotate the lock plate in a state where the plate rotation shaft is in contact with the end near the long-hole pedal arm, and the plate rotates to the end far from the long-hole pedal arm. It is configured to give a pulling force to the lock plate to rotate it away from the pedal arm according to the operation amount of the main brake device with the shaft in contact.
A foot-operated parking brake device characterized in that the lock plate is rotated to release the engaging means only when the main brake device is operated. Locking rotation means, foot-operated parking brake apparatus according to claim 1, wherein a coil spring bridging from the end closer to the pedal arm of the slot and the position and the vehicle body of the pedal arm toward the extending direction of the long hole. The foot-operated parking brake device according to claim 1 or 2, wherein the release rotating means is configured by connecting a position orthogonal to the long hole and a cable extending from the main brake device from an end close to the pedal arm of the long hole. .. Releasing rotation means, and a cable extending from the position and the main brake device that is orthogonal to the slot from the end closer to the pedal arm of the slot, according to any one of claims 1 to 3, a configuration connecting via a coil spring Foot-operated parking brake device.

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