JP4349211B2 - Foot-operated parking brake device - Google Patents

Description

  The present invention relates to a foot-operated parking brake device for an industrial vehicle represented by a forklift.

  2. Description of the Related Art Conventionally, a foot-operated parking brake device that performs brake operation and brake release of a parking brake device by pedal operation has been proposed and adopted (see Patent Document 1).

This is because the pedal arm is pivotally supported by the pedal bracket by the fulcrum pin, and the pedal is arranged at the front end of the pedal arm, while the rear side of the pedal arm with the fulcrum pin is provided. One end of a parking brake cable connected to the wheel brake mechanism is connected.
JP-A-9-267729

  However, in the above conventional example, the pedal and the connecting portion to the brake cable are arranged on opposite sides of the fulcrum pin of the pedal arm, so that the dimension of the pedal arm in the vehicle front-rear direction increases and the foot space is limited. When applied to an industrial vehicle such as a forklift, the pedal cannot be employed due to layout restrictions, such as the arrangement where the pedal jumps forward.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a foot-operated parking brake device that can be used even in an industrial vehicle in which a foot space is limited.

The present invention includes a pedal arm pivotally supported on the pedal bracket by a first pivot pin provided with a brake pedal at the tip, rotatable by a second pivot pin to the pedal bracket at a position below the pivot pin It is supported on a brake sub lever which is connected by a connecting pin to an intermediate portion of the pedal arm, and a brake cable connected to a brake device, and the first fulcrum pin side of the brake sub lever and the pedal arm Are arranged in such a manner that their angles are obtuse, and can be moved up and down in accordance with the rotational position of the brake arm in a long hole in which the first fulcrum pin to the pedal bracket of the pedal arm extends in the vertical direction. It arrange | positions and it was made to connect with the 1st fulcrum pin arrange | positioned so that the said brake cable could move up and down.

Therefore, in the present invention, a pedal arm having a brake pedal at the tip and rotatably supported by the pedal bracket by the first fulcrum pin, and a second fulcrum pin on the pedal bracket at a position below the fulcrum pin. is rotatably supported, said comprising a brake sub lever which is connected by a connecting pin to an intermediate portion of the pedal arm, a brake cable connected to a brake device, the first pivot pin of the brake sub lever and the pedal arm with the side arranged so that the angle of each other an obtuse angle, depending on the rotational position of the brake arm a first pivot pin to the pedal bracket of the pedal arm in a long hole extended in the vertical direction vertical movement The brake cable is connected to a first fulcrum pin that can be moved up and down.
That is, because the brake cable is tensioned by the first fulcrum pin that moves up and down according to the pivot position of the brake arm, it can be applied to industrial vehicles such as forklifts where the vehicle longitudinal dimension can be reduced and the foot space is limited. Even so, it is possible to lay out without placing the pedal in front.
In addition, the position of the brake pedal is lowered by the rotation around the first fulcrum pin, while it is raised by the overall raising of the pedal arm, and moves substantially horizontally (vehicle longitudinal direction) by subtracting both of them. Therefore, the movement trajectory of the brake pedal can be made relatively horizontal, and the pedal effort can be effectively exhibited.

  Hereinafter, a foot-operated parking brake device of the present invention will be described based on each embodiment.

(First embodiment)
1 to 5 show a first embodiment of a foot-operated parking brake device to which the present invention is applied, FIG. 1 is a perspective view showing the overall structure of the foot-operated parking brake device, and FIG. 2 is a foot-operated parking device. FIG. 3 is a side view of the pedal operation unit, FIG. 4 is a side view of the pedal operation unit viewed from the driver's seat side, and FIG. 5 is a side view showing the inside of the pedal operation unit. is there.

  In FIG. 1, a foot-operated parking brake device includes a pedal operation unit 2 attached to an instrument frame 1 fixed to a frame of a forklift, a wheel brake device 3, one end connected to the pedal operation unit 2, and the other end. Includes a parking brake cable 4 connected to the wheel brake device 3.

As shown in FIGS. 2 and 3, the pedal operation unit 2 includes a pedal bracket 5 attached to a bracket 1 </ b> A fixed to the instrument frame 1, and a pedal arm 6 as a fulcrum pin 7 (second fulcrum pin described later). The first fulcrum pin is supported with respect to the guide pin 18, and the guide pin 18 is rotatably supported. The pedal bracket 5 is provided with a lock lever 11 rotatably supported by a fulcrum pin 10. A pedal pad 8 is provided at the front end (rear side of the vehicle) of the pedal arm 6, and a return spring 9 stands on a pin 6 A erected from the pedal arm 6 and the pedal bracket 5 in the middle of the pedal arm 6. It is arranged in a tension state between the horizontal member 5A provided and provided, and a return spring 9 urges the pedal arm 6 to return to the initial position shown in the figure.

  As shown in FIG. 5, ratchet teeth 12 are arranged on the outer peripheral edge of the front end portion of the pedal arm 6 supported by the fulcrum pin 7, and the ratchet teeth 12 are arranged at the tip of the lock lever 11 when the pedal is depressed. It can be engaged with the claw 11A and functions to hold the pedal arm 6 in the depressed position against the return spring 9 when both are engaged. The lock lever 11 is formed integrally with a release lever 13 protruding to the driver's seat side. By pulling the release lever 13 forward, the claw 11A at the tip of the lock lever 11 is retracted radially outward from the ratchet teeth 12 of the pedal arm 6. Thus, the engagement between the claw 11A and the ratchet teeth 12 can be released, and the pedal arm 6 can be returned to the initial position by the action of the return spring 9 when released.

  On the back side of the pedal bracket 5 through which the pin 7 of the pedal arm 6 is penetrated, a damper 14 that functions to suppress abrupt rotation of the pedal arm 6 to the initial position is fixed.

  The horizontal member 5A of the pedal bracket 5 is provided with a pair of wall portions 15A opposed in the left-right direction of the vehicle and a pair of connecting portions 15B connecting the wall portions 15A up and down, and as a whole, a quadrilateral cross section elongated in the up-down direction. The guide bracket 15 is fixedly held by fastening the connecting portion 15B at the upper end with a bolt 16 in a state where the cross-sectional opening is positioned in the vehicle front-rear direction. The other end of the fulcrum pin 7 of the pedal arm 6 passes through the portion of the wall portion 15A adjacent to the pedal bracket 5 of the guide bracket 15 facing the fulcrum pin 7 of the pedal arm 6 so as to be rotatable.

The wall portions 15A of the guide bracket 15 that are opposed to each other in the vehicle left-right direction are provided with elongate elongated holes 17 facing in the vertical direction, and the guide pins 18 that function as second fulcrum pins in the opposed elongated holes 17. Is inserted along the long holes 17 so as to be slidable in the vertical direction. As shown in FIG. 3, the elongated hole 17 and the fulcrum pin 7 of the pedal arm 6 are located at substantially the same position in the vehicle front-rear direction as seen in the lateral direction of the vehicle, and the fulcrum pin 7 of the pedal arm 6 is located upward. There is a long hole 17 located below.

  One end of a brake sub lever 20 is rotatably engaged with the guide pin 18, and the other end of the brake sub lever 20 is connected to a midway portion between the pedal pad 8 and the fulcrum pin 7 of the brake arm 6. It is connected via a pin 21 so as to be rotatable. The fulcrum pin 7 of the brake arm 6, the guide pin 18, and the connecting pin 21 of the sub-lever 20 form a triangle having a wide angle at the guide pin 18, and the connecting pin 21 of the brake sub-lever 20 is the fulcrum pin 7 of the pedal arm 6. Since the guide pin 18 at one end of the brake sub lever 20 is supported so as to be movable in the vertical direction in the elongated hole 17, the guide pin 18 is supported by the brake sub lever 20. , That is, by sliding movement of the brake arm 6, the inside of the long hole 17 is slid up and down.

  Specifically, when the brake arm 6 is in the initial position where the brake arm 6 is not depressed, the connecting pin 21 and the brake sub lever 20 are pulled out to the front side, and the guide pin 18 is pulled down in the elongated hole 17. The connecting pin 21 and the brake sub lever 20 are pushed to the opposite side (the vehicle front side) when the brake arm 6 is depressed, and the guide pin 18 is pushed up in the elongated hole 17 and slid upward. The guide pin 18 is moved to an upper position in the elongated hole 17 at the final step of the depression of the brake arm 6 where the ratchet 12 and the claw 11A of the lock lever 11 are engaged.

  The guide pin 18 is connected to the other end of a parking brake cable 4 connected to the left and right brake devices 3 via an equalizer 24. The equalizer 24 includes a boss portion 26 pivotally supported by the guide pin 18, an adjustment mechanism 25 having a bolt portion 28 that is connected to the boss portion 26 and engaged with an adjustment nut 27, and an end fitting 4 </ b> A of the brake cable 4. An equalizer main body 30 is provided which is held and is supported by fitting a through hole 29 provided in the center portion with a bolt portion 28 of the adjusting mechanism 25. Accordingly, when the position of the guide pin 18 is raised in the elongated hole 17 by the depression operation of the brake arm 6, the equalizer body 30 is raised by the movement of the guide pin 18 through the adjusting mechanism 25, and the left and right connected The left and right brake device 3 can be braked by pulling up the end fitting 4A of the brake cable 4.

  The adjusting mechanism 25 can adjust the relative distance between the guide pin 18 and the equalizer main body 30 by adjusting the tightening position of the adjusting nut 27, and the pedal stroke of the pedal arm 6 and the braking effect of the left and right brake device 3 can be adjusted. The state can be adjusted. In addition, the upper part of the equalizer main body 30 is extended upward with the guide pin 18 interposed therebetween, and the equalizer main body 30 is prevented from being tilted unnecessarily by being engaged with the guide pin 18. .

  The outer cable of each brake cable 4 is coupled to the connecting portion 15B below the guide bracket 15 so as to be able to adjust the fixing position in the axial direction.

  In the foot-operated parking brake device having the above-described configuration, the brake arm 6 protrudes rearward in the initial position where the brake pedal 8 shown in FIGS. The connecting pin 21 to the arm 6 is located on the front side, and the guide pin 18 is located below the elongated hole 17. For this reason, the equalizer main body 30 is also located below, the tension of the brake cable 4 is released, and the left and right brake devices 3 are inactive.

  When the brake pedal 8 is depressed to park the vehicle, the brake arm 6 rotates downward with the fulcrum pin 7 as the center of rotation, and the connecting pin 21 with the brake sub lever 20 moves downward around the fulcrum pin 7. Turn to. By this rotation, the brake sub lever 20 is pushed forward of the vehicle, and the front end guide pin 18 is moved upward while sliding in the elongated hole 17. The upward movement of the guide pin 18 is transmitted to the brake cables 4 via the equalizer 30, and the respective brake cables 4 can be tensioned to operate the left and right brake devices 3.

  When the brake arm 6 is depressed more than a predetermined amount, the guide pin 18 is positioned in the elongated hole 17 as shown by a two-dot chain line in FIG. 5 and is operated via the equalizer 30 and the brake cable 4. The braking force of the brake device 3 also reaches a specified value, and the claw 11A of the lock lever 11 is engaged with the ratchet 12 of the brake arm 6 to restrain the return of the brake arm 6. For this reason, even if the depression of the brake pedal 8 is interrupted, the brake arm 6 does not return to the initial position due to the return by the return spring 9, and the braking state can be maintained.

  When the release lever 13 is pulled forward to start the vehicle, the engagement between the ratchet 12 of the brake arm 6 and the claw 11A of the lock lever 11 is released, and the brake arm 6 is returned to the initial position by the return spring 9. Be energized. The return to the initial position is gradually performed by the damper 14 preventing the sudden rotation of the brake arm 6 and the brake arm 6 gradually returns to the initial position.

  With the return, the guide pin 18 is lowered in the elongated hole 17, the tension of the brake cable 4 is released via the equalizer 30, and the braking of the left and right brake devices 3 is released.

  In the foot-operated parking brake device having the above configuration, the brake cables 4 of the left and right brake devices 3 are tensioned and actuated by the guide pins 18 that slide up and down in response to depression of the brake pedal 8. Even when applied to an industrial vehicle such as a forklift where the foot space is limited and the foot space is limited, the layout can be achieved without the pedal 8 jumping forward.

  Moreover, since the guide pin 18 is disposed at the other end of the brake sub lever 20 whose one end is connected to the pedal arm 6 and connected to the connecting pin 21, the guide pin 18 can be slid vertically below the fulcrum pin 7 of the pedal arm 6. When the brake arm 6 is initially depressed, the relative angle between the brake arm 6 and the brake sub lever 20 and the relative angle between the elongated hole 17 and the brake sub lever 20 are large and the brake reaction force is large (small boost coefficient). However, as the pedal is depressed, the relative angle between the brake arm 6 and the brake sub-lever 20 and the relative angle between the elongated hole 17 and the brake sub-lever 20 are reduced, and the brake reaction force is reduced (large boosting coefficient). In other words, it consists of the brake arm 6 and the brake sub lever 20 as the brake is depressed. That since Yuku close to the levers dead point action line overlap, it is possible to provide a comfortable brake depression feeling to the reaction force of the brake cable 4 which rises brought the depression.

  Further, since the guide pin 18 rises in conjunction with the depression of the brake arm 6 in the elongated hole 17 arranged in the vertical direction, the brake cable 4 drawn out from below the floor can be pulled up without being bent to operate the brake. The brake cable 4 is not excessively bent and the durability is not lowered.

In the above-described embodiment, the fulcrum pin that slides in the vertical direction is described as sliding the guide pin 18 as the second fulcrum pin of the brake sub lever 20 . One fulcrum pin 7 may be slid in the vertical direction. In this case, the movement of the first fulcrum pin 7 that is lowered by the depression of the brake pedal 8 is changed in direction by a link mechanism or the like, and the brake cable 4 may be transmitted.

  In the present embodiment, the following effects can be achieved.

A pedal arm 6 which is pivotally supported by the first pivot pin 7 to the pedal bracket 5 has a brake pedal 8 (A) the tip, at a lower position of the first pivot pin 7 (or upper position) A brake sub lever 20 rotatably supported by the pedal bracket 5 and connected to a middle portion of the pedal arm 6 by a connecting pin 21, and to the pedal bracket 5 of the brake sub lever 20 (or the pedal arm 6). The second fulcrum pin 18 (or the first fulcrum pin 7) is arranged so as to be movable up and down according to the rotational position of the brake arm 6 in the elongated hole 17 extending in the vertical direction. The brake cable 4 is connected to the second fulcrum pin 18 (or the first fulcrum pin 7) arranged in the above. That is, since the brake cable 4 is tensioned by the second fulcrum pin 18 (or the first fulcrum pin 7) that moves up and down according to the rotation position of the brake arm 6, the dimension in the vehicle front-rear direction can be reduced, and the foot Even if it is applied to an industrial vehicle such as a forklift where space is limited, it can be laid out without having to place the pedal in front of it.

(A) The pedal arm 6 and the brake sub lever 20 are connected by a connecting pin 21 so that the angle between the pedal arm 6 and the brake sub lever 20 is an acute angle, and the pedal bracket 5 of the brake sub lever 20 (or the pedal arm 6) located below the pedal bracket 5. Since the second fulcrum pin 18 (or the first fulcrum pin 7) is disposed so as to be vertically movable in the elongated hole 17 extending in the vertical direction according to the rotational position of the brake arm 6, The movement trajectory of the brake pedal 8 can be set so that the pedal arm 6 is relatively close to the horizontal position in the initial state and stepped downward. Sex can be imparted.

  (C) Since the fulcrum pins 7 and 18 to the pedal bracket 5 of the pedal arm 6 and the brake sub lever 20 are disposed in the vehicle vertical direction at the same position in the vehicle longitudinal direction or in the vicinity thereof, the space in the vehicle longitudinal direction is arranged. Can be further reduced.

(Second Embodiment)
FIG. 6 is a schematic view showing a second embodiment of a foot-operated parking brake device to which the present invention is applied. In this embodiment, the mounting portion of the brake sub lever to the pedal bracket is simply rotatable, and the fulcrum pin of the brake arm is slidable vertically with respect to the pedal bracket. The brake cable is tensioned based on the movement. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted or simplified.

In FIG. 6, the brake arm 6 is provided with a ( first) fulcrum pin 7 slidably inserted in a long hole 31 provided in the pedal bracket 5, and the fulcrum pin 7 of the brake arm 6 and the brake pedal 8. The brake sub-lever 20 is connected by a connecting pin 21 at a substantially central position. The brake sub-lever 20 is rotatably supported by the pedal bracket 5 by a ( second) fulcrum pin 32 at a position below the elongated hole 31 that guides the fulcrum pin 7. Although not shown, the equalizer and the brake cable are connected to the fulcrum pin 7 of the brake arm 6.

  In an initial state in which the brake pedal 8 is not depressed, the brake arm 6 is positioned on the line A, is connected to the brake sub lever 20 and the connecting pin 21 at a point A1 on the line A, and the fulcrum pin 7 is It is located at point A2 in the slot 31.

  As the brake pedal 8 is stepped on, the brake sub lever 20 rotates while raising the position of the connecting pin 21 with the brake arm 6 by an arc motion. By this rotation, the brake arm 6 rotates about the fulcrum pin 7 in response to the pedal depression, so that the position of the connecting pin 21 rises as a whole, and the fulcrum pin 7 is raised in the elongated hole 31. At this time, the position of the brake pedal 8 is lowered by turning around the fulcrum pin 7, but is raised by raising the pedal arm 6 as a whole, and moving in a substantially horizontal direction (vehicle longitudinal direction) by subtracting them. Forced to do.

  In the foot-operated parking brake device configured as described above, the brake cables 4 of the left and right brake devices 3 are tensioned and actuated by the fulcrum pin 7 that slides up and down in response to the depression of the brake pedal 8. Even when applied to an industrial vehicle such as a forklift where the foot space is limited and the foot space is limited, the layout can be achieved without the pedal 8 jumping forward.

  In addition, since the fulcrum pin 7 is disposed so as to be slidable in the vertical direction above the other end of the brake sub-lever 20 coupled to the pedal arm 6 by the coupling pin 21, Although the relative angle between the brake sub lever 20 and the long hole 31 and the brake arm 6 is large and the brake reaction force is large (small boosting coefficient), the brake arm 6 and the brake sub lever are depressed as the pedal is depressed. 20 and the relative angle between the long hole 31 and the brake arm 6 can be reduced to reduce the brake reaction force (large boosting coefficient). In other words, as the brake is depressed, the brake arm 6 and the brake sub lever 20 are reduced. Because the action line of both levers consisting of and approaches the dead point where it overlaps, It can have a comfortable brake depression feeling to the reaction force of the brake cable 4 to rise him to write.

  Further, since the fulcrum pin 7 rises in conjunction with the depression of the brake arm 6 in the elongated hole 31 arranged in the vertical direction, the brake cable 4 drawn out from below the floor can be pulled up without being bent to operate the brake. The brake cable 4 is not excessively bent and the durability is not lowered.

In the above-described embodiment, the fulcrum pin that slides in the vertical direction is described as sliding the first fulcrum pin 7 of the pedal arm 6, although not shown, the second fulcrum pin of the brake sub lever 20 is not illustrated. In this case, the movement of the second fulcrum pin 32 that is lowered when the brake pedal 8 is stepped down is changed in direction by a link mechanism or the like and transmitted to the brake cable 4. What is necessary is just to comprise.

  In the present embodiment, in addition to the effects (a) and (c) in the first embodiment, the following effects can be achieved.

(D) The pedal arm 6 and the brake sub lever 20 are connected by a connecting pin 21 so that the angle between the pedal arm 6 and the brake sub lever 20 is obtuse, and the pedal of the pedal arm 6 (or the brake sub lever 20) located above the pedal bracket 5 In order to arrange the first fulcrum pin 7 ( or the second fulcrum pin 32) to the bracket 5 so as to be movable up and down according to the rotational position of the brake arm 6 in the elongated hole 31 extending in the vertical direction. In the initial position, the brake arm 6 can be placed almost vertically so that the protrusion of the brake pedal 8 can be suppressed, and the movement trajectory of the brake pedal 8 can be made relatively horizontal, effectively reducing the pedal effort. It can be demonstrated.

The perspective view which shows the whole structure of the foot-operated parking brake device which shows one Embodiment of this invention. The top view of the pedal operation part of a foot type parking brake device similarly. The side view of the pedal operation part. The side view of the pedal operation part seen from the driver's seat side. The side view which shows the inside of a pedal operation part. The schematic block diagram of the foot-operated parking brake apparatus which shows 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inst frame 2 Pedal operation part 3 Wheel brake device 4 Parking brake cable 5 Pedal bracket 6 Pedal arm 7 Pedestal pin , 1st fulcrum pin 8 Brake pedal 9 Return spring 17, 31 Long hole 18 Guide pin, 2nd fulcrum pin 20 Brake sub lever

Claims (2)

A pedal arm provided with a brake pedal at the tip and rotatably supported by the pedal bracket by a first fulcrum pin ;
A brake sub-lever that is pivotally supported by a pedal bracket by a second fulcrum pin at a position below the fulcrum pin, and is connected to a middle part of the pedal arm by a connection pin;
A brake cable coupled to the brake device,
The brake sub lever and the first fulcrum pin side of the pedal arm are arranged so that the angle between them is an obtuse angle,
The first fulcrum pin to the pedal bracket of the pedal arm is arranged so as to be movable up and down in accordance with the rotational position of the brake arm in a long hole extending in the vertical direction,
A foot-operated parking brake device characterized in that the brake cable is connected to a first fulcrum pin arranged to be movable up and down. First and second pivot pins to the pedal bracket of the pedal arm and the brake sub lever to claim 1, characterized in that it is arranged to be positioned in the vehicle vertical direction at the position of the longitudinal same or near the vehicle The described foot-operated parking brake device.

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