JP3127048B2 - Foot-operated parking brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foot-operated parking brake device for a motor vehicle.

[0002]

2. Description of the Related Art As a foot-operated parking brake device, there has been known a foot-operated parking brake device which uses a locking coil type pedal lock mechanism as disclosed in, for example, Japanese Utility Model Laid-Open No. 2-104729.

[0003] In this method, a wrap spring is closely fitted to a drum provided at a pivot portion of a brake pedal, and one end of its winding end is arranged so as to be engageable with a release member with one end of the winding end as a free end. A hook is formed in the shape of a letter, and the hook is locked to a pin of the base plate. The hook is surrounded by a fixing member fixed to the pin, and the deformation and movement of the hook in the opening direction are restricted by the fixing member. This prevents the lock by the lap spring from becoming unstable.

[0004]

As described above, the fixing member restricts the deformation and movement of the hook in the opening direction.
It is necessary to perform a groove process to fit the hook exactly, and it is undeniable that the manufacturing cost is increased.

Accordingly, the present invention provides a foot-operated parking brake in which the fixed end of the lap spring can be reliably suppressed by a simple structure, and the locking performance of the pedal lock mechanism can be advantageously improved in terms of cost. An apparatus is provided.

[0006]

A drum is provided on one side of a pedal lever rotatably supported by a base plate and pulling a parking brake cable by a stepping operation, and a drum is provided concentrically with a center of rotation on the outer periphery thereof. A coil-shaped lap spring is fitted in close contact, one end of the winding end is fixed to the base plate, and the other end is disposed so as to be engageable with the release member. In a structure for locking and unlocking, one end of the lap spring is
It is held across a pair of support seats erected on the base plate, and is engaged with a U-shaped bracket disposed between these support seats and fastened and fixed to the base plate, and is pulled by the bracket and pressed onto the support seat. It is fixed.

[0007]

The bracket is inserted and engaged with one end of the winding end of the wrap spring, and this end is held on a pair of support seats. When the bracket is fastened to the base plate between the support seats, the bracket is inserted between the pair of support seats. One end of the lap spring is pulled by the bracket, pressed and fixed on these support seats, and its movement is restricted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 5, reference numeral 1 denotes a mounting sheet portion 1.
a is a base plate which is fastened and fixed to the dash lower panels D and P with bolts and nuts (not shown), and has a bottomed cylindrical shaft portion 2 protruding from one side surface thereof.

Reference numeral 3 denotes a pedal lever provided with a pad 4 at a lower end, and a cylindrical base 5 is formed at an upper end thereof. The base 5 is rotatably mounted on the shaft 2 via a bush 6. It is.

A pulley groove 7 is formed in the outer periphery of the base 5 of the pedal lever 3 near the base plate 1 over substantially half the circumference, and a parking brake cable engaged with a tether 3a formed behind the base 5 is provided. 8 is suspended in the pulley groove 7 and connected to a parking brake unit (not shown) through a cable guide 1b formed on the front end side of the base plate 1.

A cylindrical drum 9 is externally fitted to the base 5 of the pedal lever 3 from one side thereof, and a plurality of flanges 10 formed at one end of the drum 9 are swaged to the base 5 at a plurality of locations.
A coil lock wrap spring 12 is fitted and arranged on the outer periphery of the drum 9 so as to be able to contract and relax freely, thereby constituting a pedal lock mechanism 13.

The inner diameter of the wrap spring 12 is slightly smaller than the outer diameter of the drum 9, and the end 12a of the winding end near the base plate 1 is linearly extended, and the hook 12c is connected to the end of the L-shaped end. The one end 12a is fixed to the base plate 1 as described later, while the other end 12b of the winding end is bent in the radial direction to be a free end.

When the pedal lever 3 is turned in the depressing direction, the lap spring 12 is relaxed by an external force in the rewinding direction due to friction with the drum 9, and relaxes between the lap spring 12 and the drum 9. Slip occurs, and the rotation of the pedal lever 3 in the depressing direction is allowed. However, with respect to the rotation of the pedal lever 3 in the returning direction to the initial position, the wrap spring 12 causes the drum 9
And locks the pedal lever 3 at the depressed position. The lock can be released by pushing the other end 12b in a direction in which the lap spring 12 relaxes (a coil rewinding direction). ing.

Reference numeral 15 denotes a coil regulating plate which is fixed to the base plate 1 by bolts 16 and covers a fixed side of the lap spring 12, that is, a substantially semi-circumferential portion near the base plate 1 with a slight gap. This prevents the peripheral side of the hook fixed side from partially expanding in diameter during operation, thereby avoiding a lock delay at the time of locking.

A release collar 17 is provided on one side of the drum 9 and is rotatably supported on an end of a shaft 20 fixed to the center of the shaft 2 of the base plate 1. A flange 18 that covers the circumferential side with a slight gap and that suppresses a partial diameter expansion of the lap spring 12 is integrally formed like the coil regulating plate 15.

The release collar 17 has a receiving portion 19 projecting outward from the flange 18 and engaging with the other end 12b of the wrap spring 12.
An arm portion 21 further protruding outward from the receiving portion 19 is provided.

Reference numeral 22 denotes a release cable which is pulled by operation of a knob (not shown). The bumper rubber 2 regulates the rotation of the pedal lever 3 in the homeward direction to determine the initial position.
The cable 3 is connected to the arm portion 21 of the release collar 17 through a cable guide 24 fixed to the base plate 1 with a bolt 25 together with the cable 3.

Here, one end 12a of the wrap spring 12 is connected to a pair of support seats 2 projecting from the base plate 1.
6 and 27, and is engaged with a bracket 29 disposed between the support seats 26 and 27 and fixed to the base plate 1, and is pulled by the bracket 29 and pressed onto the support seats 26 and 27. It is fixed.

A locking hole 28 is formed in one of the support seats 27, and a hook 12c bent at the end of the one end 12a is inserted into and engaged with the locking hole 28.

The bracket 29 includes a bracket base 30 fixed to the base plate 1 with bolts 33 and nuts 34.
And bracket pieces 31 bent at both ends thereof are formed in a U-shape. These bracket pieces 31, 31 are formed to have a higher projecting height than the support seats 26, 27. An elongated hole 32 is formed through the one end 12a, and the edge of the elongated hole 32 is engaged with the fixed end 12a to be pulled.

Reference numeral 35 denotes a fixing plate which is fixedly held between the shaft portion 2 of the base plate 1 and the shaft 20 to prevent the pedal lever 3 from being removed.

According to the structure of the above embodiment, when the pedal lever 3 is depressed against the spring force of a pedal return spring (not shown), the lap spring 12 receives an external force in the coil rewinding direction due to friction with the drum 9. The pedal is relaxed to cause a slip with the drum 9 to allow the pedal lever 3 to rotate in the depressing direction, and the parking brake cable 8 is pulled to apply the parking brake.

When the depression of the pedal lever 3 is released, the lap spring 12 contracts and immediately sticks to the drum 9 to lock the depression position of the pedal lever 3.

When the release cable 22 is pulled by operating a knob (not shown) in a state where the parking brake is applied, the release collar 17 rotates and the receiving portion 19 engages with the other end 12b of the wrap spring 12 to wrap the lap spring. 12 is pushed in a relaxing direction.

As a result, the pedal lock mechanism 13 is unlocked, and the pedal lever 3 rotates and returns to the initial position by the spring force of the return spring, releasing the parking brake.

Here, when the wrap spring 12 contracts and relaxes, a traction force and a pushing force act on the one end 12a of the wrap spring 12 in the axial direction, and the wrap spring 12 tends to shift in the winding direction and the rewinding direction of the coil. However, the one end 12a on the fixed side is connected to the hook 12c by the locking hole 28 of the support seat 27.
Since it is inserted and engaged with the support seats 26 and 27 and held on the support seats 26 and 27, it is engaged with the bracket 29 and pulled by the bracket 29, and is pressed and fixed on the support seats 26 and 27. In addition to the movement in the axial direction, the displacement in the winding direction and the unwinding direction of the coil can be reliably suppressed, and the locking performance can be improved.

Here, if the serrated surfaces 26a, 27a are formed on the surfaces of the support seats 26, 27, as shown in FIG.
Since a is biting into these rough surfaces 26a and 27a, the displacement of the one end 12a can be more reliably prevented.

In addition, as shown in FIG. 7, a slope 26 inclined in a direction facing the respective surfaces of the support seats 26 and 27.
b, 27b, while the bent portion 12d, 1 engaging with the slopes 26b, 27b is attached to the one end 12a on the fixed side.
2e may be formed so that the displacement of the one end 12 can be more reliably prevented.

Further, as shown in FIG.
A semi-circular or V-shaped groove 26c, 27c with which the one end 12a on the fixed side engages may be formed on each surface of the above-mentioned surface, so as to more reliably prevent the displacement movement. In this embodiment, in addition to preventing the one end 12a on the fixed side of the lap spring 12 from shifting, the positioning can be performed by engaging the one end 12a with the grooves 26c and 27c when the lap spring 12 is assembled. There are advantages too.

[0031]

As described above, according to the present invention, one end of the fixed side of the wrap spring is held across a pair of support seats erected on the base plate, and is disposed between the support seats and attached to the base plate. It is engaged with a U-shaped bracket to be fastened and fixed, and is pulled and fixed by the bracket on the support seat.
During the relaxing action, the displacement of the one end on the fixed side can be reliably prevented, and the locking performance can be improved.

Moreover, since the bracket is obtained by bending the bracket into a U-shape as described above, there is an advantage that the manufacturing cost can be significantly reduced and the bracket can be provided at a low cost.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 1;

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a sectional view similar to FIG. 5, showing a second embodiment of the present invention.

FIG. 7 is a sectional view similar to FIG. 5, showing a third embodiment of the present invention.

FIG. 8 is a sectional view similar to FIG. 5, showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base plate 3 ... Pedal lever 8 ... Parking brake cable 9 ... Drum 12 ... Lap spring 12a ... One end of lap spring 12b ... The other end of lap spring 17 ... Release collar (release member) 26, 27 ... Support seat 29 ... Bracket

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Gunji Kojima 4056 Nakatsu-ji Sakuradai, Aikawa-cho, Aiko-gun, Kanagawa Prefecture Inside Japan Hojo Co., Ltd. (56) References JP-A-4-19256 (JP, A) JP-A-4-60763 (JP, U) JP-A-57-149341 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60T 7/06 F16F 1/12

Claims (1)

(57) [Claims] A drum is provided on one side of a pedal lever rotatably supported on a base plate and pulling a parking brake cable by a stepping operation, and a drum is provided concentrically with a center of rotation, and a coil-shaped wrap is provided on an outer periphery thereof. A spring is tightly fitted, one end of the winding end is fixed to the base plate, and the other end is arranged so as to be engageable with the release member, and the pedal lever is locked / unlocked by the contraction / relaxation action of the wrap spring. In this structure, one end of the lap spring is held over a pair of support seats erected on the base plate, and is engaged with a U-shaped bracket disposed between the support seats and fastened and fixed to the base plate. A foot-operated parking brake which is pulled and fixed on a support seat by the bracket. Key device.