JPH0340680Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a foot-operated parking brake device installed in an automobile or the like, and particularly to a brake release mechanism of the brake device.

(Prior Art) As a conventional foot-operated parking brake device, for example, one described in Japanese Utility Model Application Publication No. 56-21262 is known.

In this conventional device, as shown in FIG. 3, a pedal arm 50 is provided with a sector gear 51, a lock arm 52 is provided with a claw portion 53 that engages and disengages from the sector gear 51, and the claw portion 53 is connected to the sector gear 51. lock arm 52 in the direction of engagement with
A lock spring 54 is provided to bias the pedal arm 5, and the lock spring 54 maintains the engaged state of the claw portion 53 and the sector gear 51.
It was structured to lock 0.

To unlock the pedal arm 50, pull the operating lever 55 to rotate the release arm 56 from the set position in the release direction against the holding spring 57.
The release piece 58 is engaged with the lock arm 52, the lock arm 52 is rotated in the release direction against the lock spring 54, and the claw portion 53 is engaged with the sector gear 5.
It was a departure from 1.

(Problem to be Solved by the Invention) However, in this conventional device, when the lock release operation is performed, the operating lever 55 is held by the holding spring 5.
7 and the lock spring 54, and as a result, the operation of the operating lever 55 becomes difficult, resulting in poor operability.

In addition, conventionally, as a means to reduce this operating force,
Arm ratio of release arm (moment distance ratio)
However, in this case, the operating stroke of the operating lever becomes large, resulting in a poor operating feel.

(Means for Solving the Problems) The present invention was made with the purpose of solving such conventional problems, and as a technical means to achieve this purpose, the present invention uses a bracket. A sector gear is provided on the pivotally attached pedal arm, a lock arm having a claw portion that engages and disengages from the sector gear is pivotally attached to the bracket, and the lock arm has a biasing portion that urges the claw portion in a direction to engage the sector gear. A lock spring is provided, and a release arm that operates the lock arm in a direction that causes the claw portion to detach from the sector gear against the lock spring is pivotally connected to the bracket, and an operating lever is connected to the release arm, and , a foot-operated parking brake device including a pedal return spring that is stretched between a pedal arm and a release arm and urges the pedal arm in a return direction, wherein the release arm rotates the pedal return spring in a release direction. The release arm is provided so as to act as a turnover spring that biases the release arm in the release direction when it passes over the pivot point of the release arm when the release arm moves, and acts on the release arm in the release position when the parking brake is released. Of the rotational moment around the pivot point, the rotational moment in the return direction due to the lock spring is set to be larger than the rotational moment in the release direction due to the pedal return spring.

(Function) When releasing the parking brake, when the release arm is rotated in the release direction using the operation lever, the release arm rotates in the release direction and when it passes the pivot point,
The pedal return spring acts as a turnover spring that urges the release arm in the release direction, and the operating force of the operating lever is reduced by the urging force acting as the turnover spring.

To return the release arm of the parking brake device to its original state before the brake operation, when the operating force on the operating lever is released, the rotational moment at the center of the pivot joint that acts on the release arm in the release position when the parking brake is released is released. Of these, the rotational moment in the return direction due to the lock spring is set to be larger than the rotational moment in the release direction due to the pedal return spring, so that the release arm rotates in the return direction due to the difference in rotational moment, and the pedal return spring When it exceeds the position of the pivot point of the release arm, the urging force of both springs will return it to its original state.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a bracket, which is fixed to the car body at a footwell position below the driver's seat of the car.

Reference numeral 2 denotes a pedal arm, whose middle part is pivotally connected to the bracket 1 by a pin 3, a footboard 4 is provided at the lower end, and a sector gear 5 is provided at the upper end.
The sector gear 5 is provided with a one-way lock that does not engage with a claw portion 9 of a lock arm 7 (described later) in the pedal depression direction (arrow a direction) but engages in the pedal return direction (arrow b direction). formed into a gear.

Note that 6 is a brake wire that connects the pedal arm 2 and a parking brake (not shown).

Reference numeral 7 denotes a lock arm, one end of which is pivotally connected to the bracket 1 by a pin 8, and a claw portion 9 that engages and disengages from the sector gear 5 of the pedal arm 2 is provided in the middle portion.

10 is a lock spring provided between the other end of the lock arm 7 and the bracket 1;
The lock arm 7 is normally biased in a direction that causes the claw portion 9 to engage with the sector gear 5.

11 is a release arm, the middle part is pin 1
2 is pivotally connected to the bracket 1, and the lower end has a
An operating lever 14 is connected via a wire 13,
The pulling operation of the operating lever 14 causes it to rotate in the release direction (arrow M direction), and as a result of the rotation in the release direction, it engages with the lower edge of the lock arm 7 at a position near the other end, and the claw portion A release piece 15 for rotating the lock arm 7 in a direction to detach the lock arm 9 from the sector gear 5 is formed below the pivot portion.

16 is a pedal return spring, one end of which is locked to the pedal arm 2, and the other end of which is locked to the upper end of the release arm 11, and is normally attached in the direction of locking the release arm 11 to the stopper 17. At the same time, the pedal arm 2 is urged in the return direction, and the position where the release arm 11 is locked with the stopper 17 is set as the set position of the release arm 11.

The pedal return spring 17 is
When the release arm 11 is rotated from the set position in the release direction, it is formed as a turnover spring that urges the release arm 11 in the release direction over a pin 12 that is a pivot point of the release arm 11. There is.

Reference numeral 18 denotes a retaining spring, and the wire 1
3, it is provided between the bracket 1 and the release arm 11, and normally biases the release arm 11 in the direction of locking it to the stopper 17.

Next, the operation of this embodiment will be explained.

First, when parking a car, when the pedal arm 2 is depressed, the pedal arm 2 rotates around the pin 3, and this rotation causes the brake wire 6 to
The parking brake is activated via.

At this time, since the sector gear 5 does not engage the claw portion 9 in the depression direction, the sector gear 5
The pedal moves over the pawl 9, and when the foot is released from the pedal arm 2 at a predetermined depression position, the pawl 9 and the sector gear 5 engage, and the pedal arm 2 is pressed down with its return restricted. The parking brake is locked in position and the parking brake is maintained in its applied state (FIG. 1).

Next, when releasing the parking brake, when the operating lever 14 is pulled toward you against the holding spring 18, the release arm 11 rotates from the set position in the release direction, and along with this rotation, the release piece 15 engages with the lock arm 7 and rotates the lock arm 7 in the releasing direction against the lock spring 10, so that the claw portion 9 separates from the sector gear 5 and the lock of the pedal arm 2 is released. The parking brake is released at the same time that the pedal arm 2 is returned to its original position by the pedal return spring 16 (FIG. 2).

During this brake release operation, the operation lever 14
When the release arm 11 rotates in the release direction,
Along with this, the pedal return spring 16 approaches the pin 12 that is the pivot point of the release lever 11, and when it passes the pin 12, the biasing force of the pedal return spring 16 releases the release arm 11. act to bias in the direction, and therefore,
The operating force of the operating lever 14 is reduced by the amount biased by the pedal return spring 16.

To return the release arm 11 of the parking brake device to its original state before the brake operation, when the operating force on the operating lever 14 is released, it acts on the release arm 11 which is in the release position in the parking brake release state shown in FIG. Of the rotational moment at the center of the pin 12, the rotational moment in the return direction due to the lock spring 10 is set to be larger than the rotational moment in the release direction due to the pedal return spring 16, so that the difference in rotational moment causes the release arm 11 to When the pedal return spring 16 rotates in the return direction and the pedal return spring 16 passes the position of the pin 12, the release arm 11 returns to its original state as shown in FIG.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change within the scope of the invention, the technical Included in the range.

(Effects of the invention) As explained above, according to the foot-operated parking brake device of the invention, the pedal return spring is formed as a turnover spring that biases the release arm in the release direction.
The operating force of the operating lever can be reduced by the amount of assistance provided by the pedal return spring, and the effect of improving the operability of the operating lever can be obtained.

Also, since the pedal return spring is also used as this release mechanism, the structure is simplified accordingly.
It is also advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the brake operating state of the foot-operated parking brake device according to the embodiment of the present invention, Fig. 2 is a side view showing the brake release state of the embodiment device, and Fig. 3 shows the conventional parking brake device. FIG. 1... Bracket, 2... Pedal arm, 5...
... Sector gear, 7 ... Lock arm, 9 ... Claw portion, 10 ... Lock spring, 11 ... Release arm, 14 ... Operation lever, 15 ... Release piece, 1
6... Pedal return spring, 18... Retention spring.

Claims (1)

[Claims for Utility Model Registration] A sector gear is provided on a pedal arm to which a bracket is pivotally attached, a lock arm having a claw portion that engages and disengages from the sector gear is pivotally attached to the bracket, and the lock arm has a claw portion. A lock spring is provided that biases the lock spring in a direction to engage the sector gear, and a release arm that operates the lock arm in a direction that causes the claw to disengage from the sector gear against the lock spring is pivotally connected to the bracket. In the foot-operated parking brake device, an operating lever is connected to the pedal, and a pedal return spring is provided, which is stretched between a pedal arm and a release arm and biases the pedal arm in a return direction. The spring is provided so as to act as a turnover spring that urges the release arm in the release direction when it passes over the pivot joint of the release arm when the release arm rotates in the release direction, and also to act as a turnover spring that biases the release arm in the release direction. Among the rotational moments around the pivot joint acting on the release arm in the release position, the rotational moment in the return direction due to the lock spring is set to be larger than the rotational moment in the release direction due to the pedal return spring. Parking brake device.