JPH0490949A - Foot-operated parking brake device - Google Patents

Abstract

PURPOSE:To prevent the drag of a parking brake by switching a spring energizing force to the release side at an intermediate position of rotation to the unlock position of a release lever and returning a release lever to an initial position in linkage with initial position return operation of a brake pedal. CONSTITUTION:When a release knob 13 is operated in an unlock direction in a parking brake state where a pedal lever 1 is located in a parking position B and a release lever 12 is moved over a change point 0 of a turn over spring 17, the force of the spring 17 is witched to an unlock direction, and a click feeling for an operator is produced. When a pedal lock is released, the pedal lever 1 is returned to the initial position B by means of a return spring, not shown. In process of the return of the pedal lever, a lock pin 18 is engaged with the side edge of the release lever 12 in an unlock position F to rotate the release lever 12 to an initial position E. In this way, complete release of pedal lock is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a foot-operated parking brake device for a motor vehicle.

Conventional technology Figure 4 shows a conventional structure. Reference numeral 1 denotes a pedal lever rotatably attached to a base plate 2 fixed to the vehicle body by a support shaft 3. A sector gear 4 is provided on the upper edge of the pedal lever. , the end of the parking brake cable 5 is held back, and is returned to the initial position A by a return spring (not shown), and the parking brake cable 5 is pulled by being rotated by foot against the spring force of the return spring. Parking position B
It is designed to be able to rotate. Reference numeral 6 indicates a pedal locking mechanism that is disposed on the base plate 2 and locks the depressed position of the pedal lever 1, and in this example, a locking coil type mechanism is adopted. That is, this pedal lock mechanism 6 has a pinion 8 that meshes with the sector gear 4 at one end, a drum 7 rotatably mounted on the base plate 2 by a support shaft 9, and an inner diameter formed smaller than the outer diameter of the drum 7. The drum 7 is fitted with a wrap spring 10. The wrap spring 10 has one end fixed to the base plate 2 by a clamp 11, and the other end left in a free state, so that when the pedal lever l is depressed, the sector gear 4. When the drum 7 receives a rotational force in the counterclockwise direction shown in FIG. However, against rotation of the drum 7 in the clockwise direction shown in the figure, the tram 7 is stuck by the tightening force of the wrap spring 10, and the pedal lever 1 is locked in the depressed position. I'm starting to get it. 1
Reference numeral 2 denotes a bell crank-shaped release lever rotatably mounted on the base plate 2 by a support shaft 13, the upper end of which is disposed close to the free end of the wrap spring 10, and the other end connected to the knob rod I4 of the release knob 13. Yes, knob 13
By the pulling operation, the free end of the wrap spring 10 is pushed in the diametrically expanding direction to release the drum 7 from sticking, thereby allowing the pedal lever 1 to automatically return to the initial position A.

E and F in FIG. 4 indicate the initial position and unlocking position of the release lever 12. This similar structure is, for example, 1989
New car manual (G50-) published by Nissan Motor Co., Ltd. in October
1) Shown on page C-77.

Problem to be solved by the invention Depending on the operation of the release knob 13, for example, the pedal lever 1
If the release knob 13 is returned before the pedal has completely returned to the initial position A, the pedal lock mechanism 6 may lock again midway, which may cause the parking brake to drag.

Therefore, the present invention provides a click feeling when the release lever is moved to the unlock position or initial position by operating the release knob, thereby promoting a reliable parking brake release operation and preventing the parking brake from dragging. To provide a foot-operated parking brake device that can prevent

Means for Solving the Problems: A pedal lever that pulls a parking brake cable by a foot operation, a pedal lock mechanism that locks the depressed position of the pedal lever, and a release knob that is rotated by the pull operation to unlock the pedal lock mechanism. In a structure equipped with a release lever, the rotational force is switched and biased to the release lever between the initial side and the lock release side at approximately the middle position of the rotation range from the initial position of the release lever to the lock release position. The release lever is provided with a check mechanism, and the pedal lever is provided with a lever catch mechanism that moves the release lever to its initial position when the pedal lever returns to its initial position.

When you pull the release knob to release the parking brake, in the process of turning the release lever toward the unlocked position,
At approximately the middle position of the rotation range, the biasing force of the check mechanism switches to the unlocking side, a click feeling is transmitted to the operator, and the release lever is moved to the unlocking position with the biasing force of the J check mechanism. The pedal lock mechanism is unlocked when the pedal is rotated until the When the pedal lever rotates back to the initial position due to this unlocking, the release lever is interlocked by the lever catch mechanism, and the release lever is automatically returned to the initial position.

EXAMPLE Hereinafter, an example of an embodiment of the present invention in which a locking coil type pedal locking mechanism is adopted will be explained.
The same parts as those of the conventional structure will be described in detail with the same reference numerals.

1 to 3, the upper end edge of the pedal lever 1 is rotatably mounted on the base plate 2 by a support shaft 3 and rotated between the initial position A and the parking position B.
The base plate 2 has a sector gear 4 and a parking brake cable 5 end.
A tram 7 has a binion at one end that meshes with the sector gear 4 and is rotatably mounted on a support shaft 9, and is fitted onto the drum 7, with one end fixed to the base plate 2 by a clamp 11 and the other end fixed to the base plate 2 with a clamp 11. A locking coil type pedal locking mechanism 6 is provided with a wrap spring 10 in a free state, and the base plate 2 is formed in the shape of a bell crank, with an intermediate portion supported by a support shaft 13. It is rotatably mounted, and has one end connected to the knob rod 14 of the release knob 13, and the other end is provided with a release lever 12 disposed close to the free end of the wrap spring 10, etc. The basic structure is the same as the conventional one.

Here, the release lever 12 is provided with a rotational force that is applied to the release lever 12 between the initial side and the lock release side, with the release lever 12 at approximately the middle position of the rotation range from the initial position E to the lock release position F. On the other hand, the pedal lever 1 is provided with a lever catch mechanism 16 that interlocks the release lever 12 to its initial position IE when the pedal lever 1 returns to its initial position A. It is a provision.

In this embodiment, a turnover spring 17 is used as the above-mentioned check mechanism 15. The turnover spring 17 has a coil portion floating with respect to the base plate 2 surface, one end of which is fixed to the base plate 2, and the other end of which is fixed to the end of the release lever 12 on the side where the knob rod 14 is connected. Then, if the release lever 12 is on the initial side from the reference point O with reference point 0, which is approximately the middle position of the rotation range between the initial position E and the unlocking position F of the release lever 12, as a border, then Fi, F
The component force Fib of the spring force of ia acts on the initial side, and conversely, if the release lever 12 is on the unlocking side from the consideration point O, the component force Fkb of the spring force of Fk and Fka acts on the unlocking side, In the end, the release lever 1 was released after the above-mentioned consideration point 0 was reached.
2, the turning force is switched between the initial side and the unlock side.

Further, as the above-mentioned lever catch mechanism 16, in this embodiment, the release lever 12 is attached to one surface of the pedal lever.
The locking pin 18 faces one side edge of the connecting side of the knob rod 14.
It is installed protrudingly. This locking pin 18 is used when the pedal lock mechanism 6 is unlocked by moving the release lever 12 from the parking position B to the unlock position F, and the pedal lever 1 is moved to the initial position ft.
When the rotation returns to the A side, the release lever 12 is released during the rotation process.
, the release lever 12 is integrally rotated to a position beyond the consideration point O to the initial position, and thereafter the release lever 12 is rotated back to the initial position E by the spring force of the turnover spring 17. That's how it is. In FIG. 1, reference numeral 19 is a stopper provided protrudingly on a base cover plate (not shown) to restrict rotation of the release lever 12, and reference numeral 20 is a stopper formed on the base cover plate in an arc shape around the rotational fulcrum of the pedal lever 1. A guide slit is formed in the figure and engages with the locking pin 18 to guide the movement of the locking pin I8.

Next, the operation of the above embodiment apparatus will be explained.

When the pedal lever 1 is depressed to pull the parking brake cable 5 and the release knob 13 is pulled from the parking brake state where the pedal lever 1 is in the parking position B, the release lever 12 is released by the force of the turnover spring 14 via the knob rod 14. It rotates toward the unlocked position F against the

When the release lever 12 moves even a little beyond the consideration point O of the turnover spring 17 toward the unlocking position F, the spring force of the turnover spring 17 is switched to the unlocking side, which is transmitted to the operator as a click feeling. At the same time, the release lever 12 is rotated to the lock release position F, and the other end pushes the free end of the wrap spring IO to release the tightening force of the wrap spring 10 and prevent the drum 7 from sticking, that is, the pedal is locked. Release. As a result, the pedal lever 1 is rotated back to the initial position A by the spring force of a return spring (not shown), and the parking brake is released.

Here, during the rotation process of the pedal lever 1 to the initial position A, the locking pin 18 engages with the side edge of the release lever 12 stopped at the unlocking position F, and the release lever I2 are rotated together toward the initial position E direction against the turnover spring 17. When the release lever 12 goes beyond the consideration point 0 of the turnover spring 17 toward the initial position E, the spring force of the turnover spring 17 is switched to the initial position, and the release lever 12 is automatically returned to the initial position E. and separate from the locking pin 18.

In the above embodiments, the present invention was applied to a pedal locking mechanism that adopted a locking coil system, but the present invention can also be applied to a pedal locking mechanism that uses a combination of a ratchet and a ratchet pole. .

Effects of the Invention As described above, according to the present invention, a click feeling is obtained during the pedal lock release operation using the release knob, and it is possible to sense this click feeling and judge whether or not the operation is incomplete. Therefore, the operator such as the driver can be prompted to completely release the pedal lock. Furthermore, when the pedal lock is released, the check mechanism is used to rotate and stop the pedal 11- to the unlock position, so that the pedal lock is completely released and the parking brake is prevented from dragging. It has the practical effect of being able to prevent it from happening.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a front view of the pedal lock mechanism, Fig. 3 is an explanatory diagram of the operation of the check mechanism, and Fig. 4 is a side view showing the conventional structure. . DESCRIPTION OF SYMBOLS 1... Pedal lever, 5... Parking brake cable, 6... Pedal lock mechanism, 12... Release lever, 13... Release knob, 15... Check mechanism, 16
...Lever catch mechanism, A.. Initial position of the pedal lever, B.. Parking position of the pedal lever, E.. Initial position of the release lever, F.. Lock release position of the release lever. Outside: iru

Claims (1)

[Claims] (1) A pedal lever that pulls the parking brake cable by foot operation, a pedal lock mechanism that locks the depressed position of the pedal lever, and a release lever that is rotated by the pull operation of the release knob to unlock the pedal lock mechanism. In this structure, a check mechanism is provided that switches and biases the rotational force of the release lever between the initial position and the lock release side at a position approximately halfway between the rotation range of the release lever from the initial position to the lock release position. A foot-operated parking brake device, characterized in that the release lever is provided with a lever catch mechanism that is provided on the pedal lever and interlocks the release lever to its initial position when the pedal lever returns to its initial position.