JPH0752690A - Pedaling device for use in industrial vehicle - Google Patents

Abstract

PURPOSE:To reduce pedaling forces for an industrial-vehicle pedaling device provided with a brake pedal and an inching pedal by avoiding the pedals from interlocking when the inching pedal is operated. CONSTITUTION:An inching pedal 7 is connected to the push rod 28 of a brake master cylinder 27 by a link mechanism 14. An escape mechanism 26 comprising an operating pin 25 and an oblong hole 18 is set within the link mechanism 14, and only a force on the inching pedal 7 can be input to the mechanism. A brake pedal 1 is provided with an operating arm 6 which, when the brake pedal 1 is operated, engages with and presses an U-arm 20 serving as the terminal member of the link mechanism 14 from the same direction as that in which a force on the inching pedal 7 is input, thereby operating the brake master cylinder 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal device used in an industrial vehicle such as a forklift, and more particularly, in an industrial vehicle equipped with a torque converter, in addition to a normal brake pedal, a brake operation and a drive of the torque converter. The present invention relates to a pedal device including an inching pedal for simultaneously operating force control.

[0002]

2. Description of the Related Art Generally, in a forklift equipped with a torque converter, a brake pedal is mainly used for deceleration or stopping when the vehicle is traveling, and an inching pedal is exclusively used for cargo handling work. FIG. 5 shows a conventional pedal device including a brake pedal and an inching pedal. As shown in the figure, the suspension brake pedal 41 having a rotation fulcrum on the upper side is connected to a push rod 50 of a brake master cylinder 49 via a link mechanism 42. That is, when the brake pedal 41 is stepped against the return spring 43, the brake pedal 41 rotates about the support shaft 44, which is the rotation fulcrum, and the upper link 46 moves the upper link 46 via the connecting link 45. The push rod 50 of the brake master cylinder 49 connected to the arm portion 48 of the upper link 46 is pushed down by rotating the support rod 47 around the support shaft 47.

On the other hand, a hanging type inching pedal 51 having a rotation fulcrum on the upper side is arranged in parallel on the left side of the brake pedal 41, and the upper link 46 of the brake pedal system is connected via a link mechanism 52. It is configured to operate. That is, the inching pedal 5
When 1 is stepped on against the return spring 53, the inching pedal 51 rotates around the support shaft 54 which is the rotation fulcrum thereof, and the upper link 56 is supported by the connecting link 55 through the connection link 55. The brake master cylinder 49 is operated by rotating it around 57 and further pushing down the arm portion 48 of the brake pedal system upper link 46 via the arm portion 58 of the upper link 56. The inching pedal 51 is connected to an inching spool of a torque converter (not shown) via a cable 59 separately from the link mechanism 52. When the pedal is depressed, the inching spool is operated to gradually reduce the driving force of the torque converter. And finally set it to zero. That is, the driving force of the torque converter can be controlled by adjusting the depression amount of the inching pedal 51.

[0004]

However, the conventional pedal device described above has a structure in which the brake pedal system is prioritized, and the inching pedal 51 utilizes a part of the brake pedal system link mechanism 42 to form the brake master cylinder 4.
The inching pedal 5 has a structure to operate the inching pedal 9.
When depressing 1, the brake pedal system is interlocked, not only the return spring 53 of the inching pedal system,
The reaction force (returning force) of the return spring 43 of the brake pedal system is also received. Therefore, there is a problem in that a large pedaling force is required and the operation feeling is bad.

In view of the above problems, the present invention aims to reduce the pedal effort by avoiding interlocking of the pedals when the inching pedal is depressed in an industrial vehicle pedal system having a brake pedal and an inching pedal, Improving the operation feeling is a technical problem to be solved.

[0006]

In order to solve the above problems, the present invention is configured as follows. That is, an industrial vehicle pedal device according to the invention of claim 1 has a brake master cylinder and a rotation fulcrum on the upper side,
A suspension brake pedal that is urged to rotate by a return spring, an operation member that operates the brake master cylinder in conjunction with the depression of the brake pedal, and a rotation fulcrum on the upper side, and a return spring that rotates the brake master cylinder. A suspension-type inching pedal that is dynamically urged, and an operating member that operates the brake master cylinder in conjunction with the depression of the inching pedal, and includes an operating member of the brake pedal system and an operating member of the inching pedal system. The feature is that they are not connected to each other.

According to another aspect of the present invention, there is provided a pedal device for an industrial vehicle, a brake master cylinder, a suspension brake pedal which has a rotation fulcrum on an upper side and is biased by a return spring to rotate, and an upper side. A suspension type inching pedal that has a rotation fulcrum and is urged to rotate by a return spring; and a link mechanism that connects the inching pedal to the push rod of the brake master cylinder. A relief mechanism consisting of an elongated hole for allowing only the pedaling force of the pedal to be input and an operating pin engaged therewith is set, and the brake pedal is provided with respect to the end member of the link mechanism when the brake pedal is depressed. , The brake master cylinder is engaged by engaging from the same direction as the pedal input direction by the inching pedal. Is characterized in that a actuating member which.

An industrial vehicle pedal device according to a third aspect of the present invention is a brake master cylinder, a suspension brake pedal that has a rotation fulcrum on the upper side and is urged by a return spring to rotate, and an upper side. A suspension type inching pedal that has a rotation fulcrum and is urged to rotate by a return spring; and a center link having a rotation fulcrum at one end and the other end connected to the push rod of the brake master cylinder. The center link, the brake pedal, and the inching pedal are set on the same axis so that the rotation fulcrums of the center link, the brake pedal, and the inching pedal are aligned with each other. It is characterized in that the operating members facing each other are provided so as to be engageable in the same direction.

[0009]

In the pedal device according to the first aspect of the present invention constructed as described above, the brake pedal system actuating member and the inching pedal system actuating member are not connected to each other, so that the brake pedal is depressed. Sometimes, the brake master cylinder can be operated without inputting the pedaling force to the inching pedal system, and when the inching pedal is depressed, the brake master cylinder can be operated without inputting the pedaling force to the brake pedal system. You can That is, interlocking between the pedals when the pedal is depressed is avoided, and the pedal effort is reduced.

In the pedal device according to the second aspect of the present invention, when the brake pedal is depressed, the operating member of the brake pedal engages with and presses the end member of the inching pedal system link mechanism. Operate the brake master cylinder. At this time, the pedaling force of the brake pedal is prevented from being input to the inching pedal system by the relief mechanism in the link mechanism. On the other hand, when the inching pedal is depressed, the brake master cylinder is operated via the link mechanism. At this time, the terminal member of the link mechanism moves in a direction away from the operation member of the brake pedal, so that the pedaling force of the inching pedal is prevented from being input to the brake pedal system. Therefore, also in the case of the present invention, interlocking between the pedals when the pedal is depressed is avoided, and the pedal effort is reduced.

Further, in the pedal device according to the third aspect of the present invention, when the brake pedal is depressed, the operating member of the pedal engages the center link and presses the center link to activate the brake master cylinder, and When the inching pedal is depressed, the brake master cylinder is operated by the operation member of the pedal engaging and pressing the center link. Therefore, also in the case of the present invention, as in the case of the inventions of claims 1 and 2, interlocking between the pedals when the pedal is depressed is avoided, and the pedal effort is reduced. Further, according to the present invention, the rotation fulcrums of both pedals and the rotation fulcrum of the center link are aligned on the same axis, and the respective operating members provided on both pedals individually transmit the pedal depression force to the center link. With such a configuration, in the conventional pedal device, it is possible to eliminate the link mechanism for connecting the pedals and the brake master cylinder for transmitting the pedaling force.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, a pedal system according to a first embodiment of the present invention will be described with reference to FIGS. This pedal device is applied to a forklift equipped with a torque converter and, as shown in FIG. 1, includes a suspension type brake pedal 1 and an inching pedal 7 which are arranged in parallel at a predetermined interval in the left-right direction. The pedals are arranged so that their pedal portions have substantially the same height. A brake master cylinder 27 is arranged between the pedals 1 and 7.

In the suspension type brake pedal 1, a sleeve 3 provided on an upper portion of an arm portion 2 thereof is rotatably fitted to a support shaft 4 serving as a rotation fulcrum, and a return spring 5 composed of a torsion spring is used. It is held in a regulated initial position. Then, the sleeve 3 of the brake pedal 1 has a substantially L
A shaped actuating arm 6 projects radially. The operation arm 6 has a U-shaped arm portion 20 whose tip is the end member of an inching pedal system link mechanism 14 described later.
The upper surface of the brake master cylinder 27 is opposed to the upper surface of the brake master cylinder 27 so that it can come into contact with the brake master cylinder 27 via the U-shaped arm portion 20 when the brake pedal 1 is depressed. That is,
The operating arm 6 is connected to the brake master cylinder 2 via the U-shaped arm portion 20 of the inching pedal system link mechanism 14.
The brake pedal system actuating member for actuating 7 is configured.

On the other hand, the hanging type inching pedal 7 is
A sleeve 9 provided on the upper portion of the arm portion 8 is rotatably fitted to a support shaft 10 serving as a rotation fulcrum, and is held at an initial position regulated by a return spring 11 formed of a torsion spring. A protrusion 12 is provided on the upper end of the arm portion 8 of the inching pedal 7 so as to project to the back side, and an inching cable 13 is connected to the protrusion 12. That is, when the inching pedal 7 is depressed, the inching spool of the torque converter (not shown) is operated via the inching cable 13 to control the driving force of the torque converter.

Further, the inching pedal 7 is the link mechanism 1
4 is connected to the push rod 28 of the brake master cylinder 27. The link mechanism 14 is composed of an upper link 15 arranged above the inching pedal 7 and connected to the brake master cylinder 27, and an intermediate link 22 for connecting the upper link 15 and the inching pedal 7. The upper link 15 includes a sleeve 17 that is rotatably fitted around the support shaft 16, an arm portion 19 with a long hole 18 that is provided on one end side of the sleeve 17 in a radial direction, and a sleeve 17. And a U-shaped arm portion 20 which is provided on the other end side of the brake master cylinder 2 so as to project in the radial direction.
A push rod 28 of No. 7 is rotatably connected via a pin 21.

On the other hand, the intermediate link 22 of the link mechanism 14
Is rotatably connected at its lower end by a pin 23 and a projection 23 provided on the inching pedal 7, and
An operating pin 25 that engages with the long hole 18 of the arm portion 19 of the upper link 15 is provided at the upper end portion. Then,
As shown in FIG. 2, the operating pin 25 has a long hole 18 at the pedal initial position where the inching pedal 7 is not depressed.
Is in contact with the bottom surface of the brake master cylinder 2 by rotating the arm portion 19 in interlock with the depression of the inching pedal 7, that is, rotating the upper link 15.
The push rod 28 of No. 7 is pushed down.

Further, the operating pin 25 of the link mechanism 14,
The arm portion 19 with the long hole 18 of the upper link 15 constitutes a relief mechanism 26 for inputting only the pedaling force of the inching pedal 7 and not transmitting the input from the brake side to the inching pedal system. There is. Therefore, the operating arm 6 of the brake pedal 1 is connected to the link mechanism 14
Of the U-shaped arm portion 19 which is the end member of the intermediate link 22 and the upper link 15
The brake pedal system and the inching pedal system are mechanically disengaged from each other by the structure in which and are connected via the escape mechanism 26. The actuating pin 25 of the link mechanism 14 constitutes an inching pedal actuating member that actuates the brake master cylinder 27 via the upper link 15.

Therefore, in the pedal device of the present embodiment constructed as described above, when the brake pedal 1 is stepped on against the return spring 5, the operating arm 6 which rotates about the support shaft 4 is a U-shaped arm. By contacting and pressing the portion 20, the upper link 15 is rotated around the support shaft 16. Therefore, the push rod 28 is pushed down and the brake master cylinder 27 is operated. Therefore, the pedal effort is converted into hydraulic pressure to operate a wheel cylinder of a brake device (not shown). The operation of the upper link 15 at this time is not transmitted to the side of the intermediate link 22 by the action of the escape mechanism 26 including the arm portion 19 with the elongated hole 18 and the operating pin 25, as shown by the phantom line in FIG. The pedaling force of the brake pedal 1 is never input to the inching pedal system. When the pedaling force applied to the brake pedal 1 is removed, the return spring 5 returns the above members to their initial positions.

On the other hand, when the inching pedal 7 is depressed against the return spring 11, the inching spool of the torque converter is actuated via the inching cable 13, and the driving force of the torque converter is gradually reduced in accordance with the pedal depression amount. , Eventually reaching zero. At the same time, the actuating pin 25 of the link mechanism 14 exerts a downward force on the arm portion 19 to rotate the upper link 15 around the support shaft 16. Therefore, the push rod 28 is pushed down and the brake master cylinder 27 is operated. At this time, the rotating direction of the upper link 15 is a direction away from the operation arm 6 of the brake pedal 1, so that the pedaling force of the inching pedal 7 is not input to the brake pedal system.

As described above, according to the pedal system of this embodiment, when the brake pedal 1 or the inching pedal 7 is depressed, the pedals are not mechanically interlocked with each other, and the pedaling force of the brake master cylinder 27 is eliminated. It will be used as the actuating force. Therefore, as shown in FIG. 3, in the case of the conventional type in which the brake pedal is interlocked with the depression of the inching pedal, the pedal depression force is, as shown in FIG. In addition to the cylinder pressurization amount, an additional return spring of the brake pedal system is added, but in the case of the present embodiment, as shown in FIG. 3B, the return spring amount of the inching pedal system is added. And the brake master cylinder pressure increase, and it is possible to reduce the pedaling force as compared with the conventional one.

Further, according to this embodiment, the intermediate link 2
Since the connection of two is used, it can be configured without changing the conventional layout.

Next, a pedal system according to the second embodiment of the present invention will be described with reference to FIG. In the pedal device of this embodiment, the arm portion 31 of the center link 29 is rotatably connected to the push rod 28 of the brake master cylinder 27 by the pin 32, and the sleeve 30 of the center link 29 and the suspension brake are also provided. The sleeve 3 of the pedal 1 and the sleeve 9 of the hanging type inching pedal 7 are rotatably fitted on the common support shaft 33. That is, the rotation fulcrums of the brake pedal 1, the center link 29, and the inching pedal 7 are aligned on the same axis.

At the end of the sleeve 3 of the brake pedal 1, a substantially L-shaped actuating arm 6 which constitutes an actuating member of a brake pedal system for actuating the brake master cylinder 27, and a sleeve 9 of the inching pedal 7 are provided. The end portions are provided with substantially L-shaped actuating arms 34 constituting an actuating member of an inching pedal system in a radial direction so as to face each other on the same horizontal line. Arm part 3 of which the tip is the center link 29
0 are opposed to each other so as to be abuttable with a slight gap therebetween. The arm portion 31 of the center link 29
Is formed wide so as to have a sufficient contact surface with both operating arms 6 and 34 of the brake pedal 1 and the inching pedal 7.

Therefore, in the pedal system of this embodiment, when the brake pedal 1 is depressed, the actuating arm 6 which rotates about the support shaft 33 presses the arm portion 31 to rotate the center link 29 about the support shaft 33. To move. Therefore,
The push rod 28 is pushed down and the brake master cylinder 27 is operated. On the other hand, inching pedal 7
When stepping on, the operating arm 34 that rotates around the support shaft 33 presses the arm portion 31 to rotate the center link 29 around the support shaft 33. Therefore, the push rod 28
Is pushed down to operate the brake master cylinder 27. That is, the brake pedal system and the inching pedal system are not mechanically interlocked between the pedals, and the pedaling force is used as a force for operating the brake master cylinder 27, which improves the operation feeling. To be done.

However, in this embodiment, the brake pedal 1, the inching pedal 7 and the center link 29 are provided.
The rotation fulcrums of the members are aligned and arranged on the same axis, and the operation arm 6 of the brake pedal 1 and the operation arm 34 of the inching pedal 7 are individually operated by the center link 29. Since they are not connected to each other, the link mechanism used as the intermediate transmission mechanism of the pedaling force, which is used in the conventional pedal device, can be omitted. As a result, the structure of the pedal device can be simplified, and the freedom in layout can be obtained.

The present invention is not limited to the above embodiment, but various modifications can be made without departing from the scope of the invention. For example, in the first embodiment, the relief mechanism 26 set in the link mechanism 14 is replaced with the relief system by sliding the elongated hole 18 and the operating pin 25, and the operating arm 6 of the brake pedal 1 and the U-shaped arm of the upper link 15 are replaced. You may change to a contact system like the relationship with the part 9. Further, in the first embodiment, the inching pedal system link mechanism 14 is provided on the brake pedal 1 side, and the escape mechanism 2 including the arm portion 19 with the elongated hole 18 and the operating pin 25 is provided therein.
6 may be set, while the operation arm 6 of the brake pedal 1 may be provided on the inching pedal 7 side.
Furthermore, in the second embodiment, the arm portion 31 of the center link 29 and the operation arms 6 and 34 of both pedals 1 and 7 are used.
From the contact method, the long hole 1 described in the first embodiment
8 and the operating pin 25 may be changed to a relief system.

[0027]

As described in detail above, according to the present invention,
When depressing the brake pedal or inching pedal,
It is possible to operate the brake master cylinder for each system while avoiding mechanical interlock between the pedals.
Therefore, unlike the conventional device in which the brake pedal is interlocked when the inching pedal is depressed, in the case of the brake pedal, the pedaling force of the inching pedal is reduced,
The operation feeling can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a pedal device according to a first embodiment of the present invention.

FIG. 2 is a side view showing a relief mechanism in the link mechanism.

FIG. 3 is a comparison diagram of inching pedal depression force between a conventional pedal device and a pedal device according to the present invention.

FIG. 4 is a perspective view of a pedal device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional pedal device.

[Explanation of symbols]

 1 ... Brake pedal 4 ... Spindle 5 ... Return spring 6 ... Actuating arm 7 ... Inching pedal 10 ... Spindle 11 ... Return spring 13 ... Inching spool 14 ... Link mechanism 15 ... Upper link 18 ... Long hole 19 ... Arm part 20 ... U-shaped arm portion 25 ... Operating pin 26 ... Relief mechanism 27 ... Brake master cylinder 28 ... Push rod

Claims (3)

[Claims] 1. A brake master cylinder, a suspension type brake pedal which has a rotation fulcrum on the upper side and is urged to rotate by a return spring, and the brake master cylinder linked to the depression of the brake pedal. An actuating member to be actuated, a hanging inching pedal having a turning fulcrum on the upper side and biased by a return spring to turn, and an actuating member actuating the brake master cylinder in conjunction with depression of the inching pedal. A pedal device for an industrial vehicle, comprising: a brake pedal system actuating member and an inching pedal system actuating member, which are not interconnected. 2. A brake master cylinder, a suspension brake pedal which has a turning fulcrum on the upper side and is biased by a return spring, and a turning fulcrum on the upper side, which is rotated by a return spring. A suspension-type inching pedal that is dynamically urged, and a link mechanism that connects the inching pedal to a push rod of a brake master cylinder, and the link mechanism allows only the pedaling force of the inching pedal to be input. A relief mechanism including an elongated hole and an operating pin that engages with the elongated hole is set, and the brake pedal is connected to the end member of the link mechanism when the brake pedal is depressed from the same direction as the pedal input direction by the inching pedal. Industrial vehicle pedal system provided with an operating member that engages to operate the brake master cylinder . 3. A brake master cylinder, a suspension type brake pedal which has a rotation fulcrum on the upper side and is urged to rotate by a return spring, and a rotation fulcrum on the upper side, which is rotated by a return spring. A suspension-type inching pedal that is dynamically urged, and a center link that has a rotation fulcrum at one end and that is connected at the other end to the push rod of the brake master cylinder. The center link, the brake pedal, and While setting each rotation fulcrum of the inching pedal in alignment with the same axis, the brake pedal and the inching pedal are respectively provided with operating members facing the center link so as to be engageable with each other in the same direction. Provided industrial vehicle pedal device.