JPH0425407Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a pedal-type parking brake that is installed on vehicles equipped with an automatic transmission, and in particular, the invention relates to a pedal-type parking brake equipped with a vehicle equipped with an automatic transmission. This invention relates to improvements to improve the brake release operability of parking brakes.

(Conventional technology) Vehicles equipped with automatic transmissions are often equipped with a parking brake pedal at the foot of the driver's seat, and many new technologies related to this pedal-type parking brake have been proposed. (For example, Utility Model Application No. 58-194952, Utility Model Application No. 58-1949
No. 160862, Utility Model No. 58-50054, etc.).

FIG. 4 is a diagram showing the pedal type parking brake disclosed in the above-mentioned Japanese Utility Model Publication No. 58-194952.

By rotating around a support shaft 2, the pedal 1 pulls a brake wire 3 connected to a parking brake (not shown) and operates the parking brake.

At this time, since the pawl 5 is engaged with the ratchet 4 formed at the upper end of the pedal 1, the pedal 1
The parking brake is stopped at the depressed position, and the parking brake can remain applied even if the foot is released from the pedal 1.

In addition, when releasing the parking brake, by manually pulling the release lever 6, the release lever 7 rotates, the pawl 5 and the ratchet 4 are unlatched, and the pedal 1 is returned to its original position. When the parking brake returns to normal, the parking brake is released.

(Problems to be Solved by the Invention) However, as mentioned above, in the conventional pedal-type parking brake, it is necessary to manually operate the release lever to release the brake. Due to its relationship with the pole and linkage, it is often forced to be placed below the instrument panel near the pedal 1, so the driver has to bend his or her upper body forward to operate the release lever 6. This may be a nuisance in terms of operability.

Therefore, an object of the present invention is to provide a pedal-type parking brake that eliminates troublesome operations such as operating a release lever and allows the parking brake to be easily released even in a normal driving position.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a pole driving section that engages with the pole, a first driven abutment section, and a second driven abutment section. and a drive input intermediary that causes the pawl drive unit to move the pawl from the ratchet latching position to the ratchet release position by forward movement from the predetermined retreat position, and causing the pedal latching mechanism to release the latching of the pedal to the depressed position. parts and
The actuator is driven by an electric actuator to move forward and backward, and as the actuator moves forward, it comes into separable contact with the first driven contact portion of the drive input mediating member located in the retreated position, thereby applying a driving force thereto. an electric release drive member that inputs an input and moves the drive input mediating member forward; and an electric power disposed near the driver's seat for instructing the electric actuator to move the electric release drive member forward. The switch is driven by a manual operation member to move forward and backward independently of the electric release drive member, and its forward movement allows the drive input intermediary member located at the retreated position to be separated into the second driven contact portion. Input the driving force there by contacting the
A manual release drive member for moving the drive input mediating member forward is provided.

(Function) For the pedal type parking brake with the above configuration,
When the driver operates the electric switch with the pedal locked in the depressed position due to the action of the ratchet and pawl of the pedal locking mechanism,
The electric actuator is actuated to move the electric release drive member forward, whereby the electric release drive member separably comes into contact with the first driven contact portion, thereby inputting a driving force thereto. The drive input intermediary member is moved forward, whereby the drive input intermediary member causes the pawl drive unit to move the pawl from the ratchet latching position to the ratchet release position, causing the pedal latching mechanism to engage the pedal in the depressed position. The stop is released, and the pedal returns to its original position.

Furthermore, when the driver manually operates the manual operation member (lever, handle, etc.) to move the manual release drive member forward, the manual release drive member is separably abutted against the second driven contact portion. The drive input intermediary member moves the drive input intermediary member forward by inputting a driving force thereto, thereby causing the drive input intermediary member to move the pawl from the ratchet latching position to the ratchet release position in the pawl drive section, and thereby the pedal This causes the latching mechanism to release the latching of the pedal to the depressed position, thus causing the pedal to return to its original position.

Moreover, with this configuration, the electric release drive member and the manual release drive member move forward and backward independently, and
Even if any one of them moves the drive input intermediary member forward, the contact between the other and the corresponding first or second driven abutment part is cut off.
When the pedal locking mechanism is used to release the pedal by operating an electric switch, the manual operation member does not interlock and protrude and interfere with driving operation, and in the unlikely event that the electric switch or Even if the actuator fails and the electric release drive member does not move, the manual operation member can be manually operated without being hindered by the actuator to cause the pedal locking mechanism to release the pedal.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 to 3 show an embodiment of the pedal-type parking brake of the present invention, in which the pedal 11 is
It is provided at the foot of the driver's seat in line with the accelerator pedal, and when the driver steps on it, it rotates around the support shaft 12 fixed to the frame 30.
The parking brake is activated by pulling the brake wire 13 connected to a parking brake (not shown) attached to the upper end of the pedal 11.

Further, a ratchet 14 is formed integrally with the upper end of the pedal 11, and this ratchet 14 has a support shaft 15b fixed to the frame 30.
The pawl 15 is engaged with the pawl 15, which rotates with the pawl 15 as a fulcrum, and this pawl 15 swings between the illustrated ratchet latching position, in which it engages with the ratchet 14 and engages it, and the unillustrated ratchet open position, in which it comes off from the ratchet 14. Therefore, these ratchets 14 and pawls 15 constitute a ratchet type pedal latching mechanism. The engagement location between the pawl 15 and the ratchet 14 is determined from the line connecting the support shaft 12 and the support shaft 15b so that the pawl 15 is always urged toward the ratchet latching position shown in the figure by its own weight. Make sure it is at the bottom of the diagram. Further, the lower end 15a of the pawl 15 is attached to a hook 20c (shown in FIG. 2) of a release lever 20 as a drive input mediating member equipped with a missed swing mechanism to be described later.
They engage by touching each other.

The release lever 20, as shown in FIG.
Slit plate 20b with slits 20d formed therein
The lower end 15 of the pole 15 is bent into an L shape.
The release lever 20 is composed of a guide 20a having a U-shaped cross section and serving as a pole drive unit, which is integrated into a slit plate 20b and has a portion of the hook 20c that abuts on the frame 3.
0 and the slit plate 20b (shown in FIG. 1)
It is biased to the left in the figure and is normally located at the retreated position shown in the figure.

In addition, a rotating arm 2 is provided on the front side of the frame 30.
1 is attached, and this electric actuator 16 is configured to rotate the rotation lever 21 by turning an electromagnetic solenoid ON and OFF, for example.

The switch 17, which is an electric switch for turning on the electric actuator 16, is located on the front of the instrument panel (not shown) or
The shift lever (not shown), steering wheel, etc. are mounted in a position that the driver can easily reach even in a normal driving position, and the electric switch for turning off the electric actuator 16 is mounted on the pedal 11. An original position return detection switch 23 installed at the original position (the position when the parking brake is released) is used.

These electric actuator 16 and switch 1
7 and the home position return detection switch 23 are as shown in FIG.
A two-contact switch with a spring is used. This home position detection switch 23 is arranged so that the push rod 23a is at the home position of the pedal 11, and when the pedal 11 is at the home position,
Push rod 23a is pushed by the back of pedal 11, causing contact A to close and contact B to open. In this state, power to the electric actuator 21 is cut off, and on the other hand, the indicator lamp 27 lights up to indicate that the parking brake is released.

Rotating arm 2 of the electric actuator 16
1 supports one end of a control rod 22 as a drive member for electric release, and the other end of this control rod 22 is bent and slidably inserted into a slit 20d of a slit plate 20b. ing. The other bent end of the control rod 22 is connected to the electric actuator 16 when the electric actuator 16 is turned off.
In this state, the slit 20d of the release lever 20 in the retracted position is located at the front end (the right end in FIG. 1), and is adjacent to the front end of the slit plate 20b, which serves as the first driven contact part. and
When the electric actuator 16 is in the ON state, the rotating arm 21 rotates in the direction of arrow C in FIG. Input the driving force there and press the release lever 20.
is also moved forward in the direction of arrow C.

Furthermore, a release rod 19 as a manual release drive member is slidably inserted into the guide 20a of the release lever 20, and a handle 18 as a manual operation member is attached to the front end of the release rod 19. . Further, the other end of the release rod 19 is provided with a bent portion 19a so as to fit into the hook 20c as a second driven contact portion of the release lever 20 located in the retracted position and to abut against the inner wall portion of the hook 20c. is formed. In order to prevent the release rod 19 from rotating within the guide 20a, the upper and lower surfaces of the release rod 19 are flattened to match the shape of the inner circumference of the guide 20a, as shown in the sectional view in FIG.

Next, the operation of this embodiment will be explained. First, the driver presses the pedal 11 to activate the parking brake.
When the driver depresses the brake wire 13, the parking brake is activated.In this state, the pawl 15, which has rotated by its own weight toward the ratchet latching position, engages with the ratchet 14, causing the pedal 1 to engage.
1 is prevented from returning to its original position.

Then, when the parking brake is to be released next time, the driver can automatically release the parking brake by pressing the switch 17.

That is, when the switch 17 is pressed, the electric actuator 16 operates and the rotating arm 21
The rotation of the control rod 22 moves the control rod 22 forward, and the contact between the bent other end of the control rod 22 and the front end of the slit plate 20b drives the release lever 20 as described above and moves it to the retracted position. As a result, the guide 20a of the release lever 20 rotates the pawl 15 with its hook 20c to the ratchet release position, causing the pawl 15 to release the latch 14. So, pedal 11
returns to its original position and the parking brake is released.
At this time, when the pedal 11 returns to the original position, the contact point of the original position return detection switch 23 is switched, and the electric actuator 16 is turned off.

The parking brake can also be released by manually pulling the handle 18.

That is, when the release rod 19 is pulled and moved forward in the direction of arrow C by pulling the handle 18, this bent portion 19a is moved toward the release lever 20.
The release lever 20 is inserted into the hook 20c and comes into contact with its inner wall, and a driving force is input thereto to release the release lever 20.
are moved forward together from the upper reverse position, whereby the hook 20c of the release lever 20 rotates the pawl 15 to the ratchet release position, and the parking brake is released in the same manner.

By the way, the release lever 20 is
0d and the hook 20c constitute a missed swing mechanism. That is, when the parking brake is released by the electric actuator 16, the release lever 20 comes into contact with the other end of the control rod 22 and the front end of the slit plate 20b, as shown in FIG. Although it is twisted and pulled, the guide 20a
The bent portion 19a of the release rod 19 inserted therein is connected to the hook 20 of the release lever 20.
The release lever 20 will therefore slide on the release rod 19.

When the handle 18 is pulled, a driving force is input by the contact between the bent part 19a of the release rod 19 and the hook 20c, and the release lever 20 moves forward, but the other end of the control rod 22 Since the slit 20d is formed, the slit plate 20b is separated from the front end portion and slides within the slit 20d without being subjected to any pressing force.

Such a missed swing mechanism allows the release operation by the electric actuator 16 and the release action by the operation of the handle 18 to be performed separately and independently.

Therefore, according to the configuration of this embodiment, even if the rotating arm 21 becomes unable to rotate due to a failure of the electric actuator 16, for example, the release operation can be performed by manually operating the handle 18. On the other hand, the handle 18 will not be pushed out during the release operation by the electric actuator 16.

Furthermore, in this embodiment, the electric actuator 1
6 is turned off by the home position return detection switch 23, the electric actuator 16 is turned off when the pedal 1 has definitely returned to the home position, and the pedal 11 is turned off when the pedal 11 returns to its home position. During the position return operation, the electric actuator 16
This prevents the parking brake from becoming half-effective due to being turned off.

(Effects of the invention) As explained in detail above, according to the invention,
By simply operating the electric switch while the vehicle is in its normal driving position, the pedal locking mechanism that locks the parking brake pedal in the depressed position is released and the parking brake pedal returns to its original position. Therefore, the operability of releasing the parking brake can be improved.

Moreover, according to the present invention, between the electric actuator and the manual operation member and the pedal locking mechanism,
Since we have inserted an idle mechanism consisting of an electric release drive member, a manual release drive member, and a drive input intermediary member, the manual operation member is interlocked when the pedal locking mechanism is released by operating an electric switch. In addition, even if the electric switch or electric actuator breaks down and the electric release drive member stops moving, it can be used manually without being hindered. The locking of the pedal locking mechanism can be released by manual operation of the operating member, and the parking brake can be quickly released.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of one embodiment of the present invention, Fig. 2 is a perspective view showing the release lever portion in the same embodiment, and Fig. 3 is an electric current that operates the electric actuator in the same embodiment. Diagram showing the circuit system, No. 4
The figure is a sectional view showing a conventional example. 11...pedal, 14...ratchet, 15...
...Pole (constituting the pedal locking mechanism together with the ratchet 14), 16...Electric actuator,
17... Switch (electric switch), 18... Handle (manual operation member), 19... Release rod (drive member for manual release), 20... Release lever (drive input mediating member), 20a... Guide (pole drive) ), 20b...slit plate (front end forms first driven abutting part), 20c... hook (first driven abutting part), 21... rotating arm,
22... Control rod (driving member for electric release), 23... Original position return detection switch.

Claims (1)

[Claims for Utility Model Registration] 1. A ratchet connected to a pedal, movable between a ratchet latching position in which the ratchet is latched, and a ratchet open position in which the ratchet is released from the ratchet, and always directed toward the ratchet latching position. and a biased pole constitutes a pedal latching mechanism that latches the pedal in a depressed position and prevents it from returning to its original position when the parking brake is activated by depression of the pedal. The pedal-type parking brake includes a pole drive unit that engages with the pole, and a first
The pawl has a driven abutment part and a second driven abutment part, and when the pawl is moved forward from a predetermined retreat position, the pawl is moved from the ratchet locking position to the ratchet release position by the pawl driving part. a drive input intermediary member that causes the pedal latch mechanism to release the pedal from the depressed position; and a drive input intermediary member that is driven by an electric actuator to move forward and backward, and whose forward movement causes the drive input intermediary member to be located at the retreated position. an electric release drive member that inputs a driving force into the first driven contact portion by contacting the first driven contact portion in a separable manner to move the drive input intermediary member forward; Driven by an electric switch provided near the driver's seat for instructing the forward movement of the release drive member and a manual operating member, the release drive member moves forward and backward independently of the electric release drive member, and the forward movement causes the release drive member to move forward and backward. , a manual release for moving the drive input intermediary member forward by inputting a driving force thereto by separably abutting the second driven abutting portion of the drive input intermediary member located in the retracted position; A pedal-type parking brake, characterized in that it is provided with a driving member for use in the parking lot. 2. Practical, characterized in that it is provided with a home position return detection switch that detects that the pedal has returned to its home position and stops the operation of the electric actuator that moves the electric release drive member forward. A pedal-type parking brake according to claim 1 of the patent registration claim.