JP3349939B2 - Brake structure of cargo handling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake structure of a loading and unloading vehicle which changes brake torque in accordance with a running speed of a vehicle body, a weight of a cargo of a loading and unloading device, or a difference among individual drivers. SOLUTION: A pair of brake pads 19 which nip a brake disc 18 from both side faces are respectively fixed non-nip faces on a pair of nip bodies 21 on both side faces of the brake disc which are supported rotatably in the direction in which the brake disc is nipped and held by a nip shaft 20, the brake disc 18 is nipped and held by a spring 23 nipped between a non-fixed face of the brake pad of the nip body 21 and a drive part 25B of an actuator fixed on a vehicle body, and the drive part 25B of the actuator drives to expand and shrink a spring 23 by a pushbutton arranged in a cab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake structure of a cargo handling vehicle for changing a braking torque according to a running speed of a vehicle body, a weight of a load of a cargo handling device, or an individual difference of a driver.

[0002]

2. Description of the Related Art In the prior art, for example, in a reach type forklift, a brake pedal is arranged below a driver's cab of a vehicle body, a link mechanism is used by depressing the brake pedal, and a brake that rotates with the rotation of the wheels. A brake structure for a cargo-handling vehicle that releases a pair of brake pads from both sides of a disk to release the brake pads. The brake pads are pushed in the direction of holding the brake disks through a holding body by a spring having one end fixed to the vehicle body. . Therefore, when the vehicle is running, the driver puts his / her weighted left foot on the brake pedal in a standing posture and always depresses the brake pedal to travel, and when braking, the driver releases the left foot from the brake pedal to perform braking.

[0003]

Normally, a passenger car or the like uses a brake that generates a braking force by sitting on a driver's seat and depressing a brake pedal. By gradually depressing the brake, a braking operation according to a traveling speed is performed. It is possible. But,
In the above-described brake structure, the weighted foot must be placed on the brake pedal during traveling, and the foot must be released from the brake pedal during braking. Detailed braking operation cannot be performed according to the running speed. Therefore, the brake torque force is set to the maximum vehicle running speed and the brake torque force at the maximum load weight.In this setting, if the vehicle speed is low or no load is loaded, the braking operation will be performed. There were various dangers such as sudden braking, falling loads, or slipping wheels, especially on slippery roads. Further, when the brake torque force is increased, a large depressing force of a brake pedal which is constantly depressed when the vehicle body is traveling is required, which is a burden upon driving.

In order to solve the above-mentioned problems, the present invention has devised a brake structure of a cargo handling vehicle capable of generating a braking force in accordance with the vehicle speed and the weight of the load even in such a brake structure.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a vehicle body and a cargo handling device. The vehicle body has an operator's cab, the operator's cab has a brake pedal, and the brake pedal is depressed. In a brake structure for a cargo-handling vehicle that releases a pinch of a pair of brake pads from both sides of a brake disc that rotates with the rotation of a wheel by using a link mechanism, a pair of brake pads that pinches the brake disc from both sides is a holding shaft. The non-clamping surfaces are fixed to a pair of clamps on both sides of the brake disc rotatably supported in the brake disc clamping direction, and the brake pad non-fixed surfaces of the clamps and the drive unit of the actuator fixed to the vehicle body. The brake disc is clamped by the spring sandwiched between them, and the actuator is driven by the push button arranged in the cab. Part is a brake structure of the cargo handling vehicle to drive so as to stretch the spring.

Alternatively, the vehicle body is provided with a traveling speed detector,
The brake structure of the cargo handling vehicle described above is such that the driving unit of the actuator drives the spring to expand and contract in accordance with the detection value of the traveling speed detector.

Alternatively, the cargo handling device is provided with a load detector,
The above-described brake structure for a cargo-handling vehicle in which the drive unit of the actuator drives the spring to expand and contract in accordance with the value detected by the load detector.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the present invention, the present invention will be described with reference to a reach type forklift. 6 and 7, reference numeral 1 denotes a reach-type forklift, 2 denotes a vehicle body of the reach-type forklift 1, and 3 denotes a cargo handling device for moving a load up and down in front of the vehicle body 2. The vehicle body 2 is provided with a pair of left and right straddle legs 4 for moving the cargo handling device 3 forward and backward, and a driver's cab 5 on which a driver stands and drives on the rear right side.
Further, a brake pedal 6 which the driver depresses while standing, a driving lever 7 for instructing a traveling speed, and a cargo handling lever for instructing each cargo handling operation of the cargo handling device 3 are provided in a lower portion of the cab 5. 8. On the left side of the cab 5, a steering handle 9 for instructing the traveling direction is arranged. Also,
The wheels consist of a road wheel 10 at the tip of the left and right straddle legs 4, a caster wheel 11 below the driver's cab 5, and a drive wheel 12 that turns, drives and brakes according to a driver's instruction below the steering handle 9. The cargo handling device 3 includes a fork 13 that moves back and forth along the straddle leg 4, directly loads a load, and moves up and down.

FIGS. 1 to 3 show a reach type forklift 1.
The brake pedal 6 is disposed at the lower left front of the cab 5 of the vehicle body 2, and the brake pedal 6 and the cam 15 mounted above the traveling motor 14 are connected to a link 16. And a link mechanism including a rotating shaft 17 and the like.

The link mechanism of the brake structure of the reach-type forklift 1 must be complicated due to the arrangement of various devices provided inside the vehicle body 2. Hereinafter, the link mechanism will be described. First link 16A to eighth link 16H,
When the brake is released, the driver presses down on the brake pedal 6 to stop the brake together with the brake pedal 6 on the first rotary shaft 17A. The one link 16A is pulled down, and the second rotating shaft 17B, the second link 16C,
Third rotating shaft 17C fixed to link 16C, third link 16C fixed to third rotating shaft 17C, fourth rotating shaft 17
D, fourth link 16D, fifth rotary shaft 17E, fifth link 16E, sixth rotary shaft 17 fixed to fifth link 16E
F, sixth link 16F fixed to sixth rotation shaft 17F, seventh rotation shaft 17G, seventh link 16G, eighth rotation shaft 17
H, the eighth link 16H, and the ninth rotating shaft 17I fixed to the eighth link 16H, and the cam 15 fixed to the ninth rotating shaft 17I is rotated clockwise in the figure to release the brake.

A brake disk 18 that rotates coaxially with an output shaft 14A of the drive motor 14 is disposed above the drive motor 14 that generates the driving force of the drive wheel 12. The brake disk 18 is a pair of brake pads. 1
9 is fixed inside and the brake disc 1
8 is held between a pair of holding bodies 21 rotatably fixed in the width direction, and the pair of holding bodies 21 are penetrated by the through shaft 22, and the lower ends thereof are bolted to the bolts 24 in a state where the spring 23 is also sandwiched in the upper part. The upper end is held by the drive unit 25B of the actuator 25.

Reach type forklift 1 having these configurations
When the driver gets on the reach-type forklift 1 and depresses the brake pedal 6, the cam 15 rotates clockwise via the link mechanism, and the cam 15 widens the gap between the holding bodies 21. Therefore, by continuously depressing the brake pedal 6, the brake disc 18 is continuously released from the clamping force of the brake pad 19, and the traveling motor 14 can rotate freely and can travel.

When the reach type forklift 1 is stopped,
When the foot is released from the brake disc 18, the holding force of the rotation of the cam 15 is lost via the link mechanism, and the spring 23 pushes back the holding body 21 and the brake disc 18
Of the traveling motor 14
Stop the rotation of.

As shown in FIGS. 4 and 5, the actuator 25 has a main body 25A fixed to a vehicle body via a bracket 26, and a drive unit 25B expands and contracts vertically to expand and contract the spring 23. The driver drives the actuator 25 by pressing a push button 27 in front of the cab 5.
The drive portion 25A of the brake pad 19 is extended, the spring 23 is shortened, and the torque with which the brake pad 19 sandwiches the brake disk 18, that is, the brake torque is strengthened.
(However, the actuator is fixed to the traveling motor via a bracket in a structure in which the link mechanism is suspended together with the traveling motor.)

Therefore, when the driver wants to generate a strong braking torque, he turns on the push button 27,
To generate a small brake torque, the push button 27 may be turned off.

In addition to the above-described embodiment, the actuator is driven in accordance with a detection value of a traveling speed detector provided in advance in a reach-type forklift, or is driven by a load detector on a fork. , The brake torque can be automatically optimized. Of course, in addition to these, the present invention can be carried out in accordance with various detection values existing conventionally, such as combining the two or detecting the inside and outside of a warehouse.

In the above-described embodiment, the push button is used, so that only two levels of brake torque are set. However, three or more levels can be set according to the detected value, and a hydraulic actuator may be used.

[0018]

As described above, by providing the cargo handling vehicle brake structure of the present invention as described above, a brake device having a structure in which a weighted foot is placed on the brake pedal during traveling and the foot is released from the brake pedal during braking. Since the brake torque can be controlled according to the driver's judgment, traveling speed, the presence or absence of load, etc., it is free from various dangers such as falling of load due to sudden braking or slipping of wheels on slippery road surface. is there. In addition, since the brake torque force can be set to the minimum necessary, the depression force of the brake pedal, which is constantly depressed when the vehicle is traveling, can be minimized, and the load during driving can be reduced.

[Brief description of the drawings]

FIG. 1 is a right side view of a brake structure embodying the present invention.

FIG. 2 is a rear view of a brake structure embodying the present invention.

FIG. 3 is a top view of a brake structure embodying the present invention.

FIG. 4 is a side view when the actuator embodying the present invention is extended.

FIG. 5 is a side view at the time of shortening the actuator embodying the present invention.

FIG. 6 is a side view of a reach type forklift embodying the present invention.

FIG. 7 is a rear view of the reach type forklift embodying the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reach type forklift 2 Body 3 Cargo handling device 4 Straddle leg 5 Operator's cab 6 Brake pedal 7 Traveling lever 8 Cargo handling lever 9 Steering handle 10 Road wheel 11 Caster wheel 12 Drive wheel 13 Fork 14 Traveling motor 15 Cam 16 Link 16A 1st link 16B 2nd link 16C 3rd link 16D 4th link 16E 5th link 16F 6th link 16G 7th link 16H 8th link 17 Rotation axis 17A 1st rotation axis 17B 2nd rotation axis 17C 3rd rotation axis 17D 4th rotation Shaft 17E Fifth rotating shaft 17F Sixth rotating shaft 17G Seventh rotating shaft 17H Eighth rotating shaft 17I Ninth rotating shaft 18 Brake disc 19 Brake pad 20 Holding shaft 21 Holding body 22 Through shaft 23 Spring 24 Bolt 25 Actuator 25A main body 25B drive unit 26 bracket 27 push-button

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI F16D 65/34 F16D 65/34 (58) Investigated field (Int.Cl. ⁷ , DB name) F16D 65/28-65/36 F16D 55/22-55/224 B60T 7/04 B60T 8/18 B61H 13/30

Claims (3)

(57) [Claims] An cab is provided in the cab, a brake pedal is provided in the cab, and a link mechanism is used by depressing the brake pedal to rotate a wheel. In a brake structure of a cargo-handling vehicle that releases a pair of brake pads from both sides of a brake disk that rotates together, a pair of brake pads that hold the brake disk from both sides can rotate in the direction of holding the brake disk by the holding shaft. A non-clamping surface is fixed to each of a pair of clamps on both sides of the brake disc which is pivotally supported by the brake pad, and a spring clamped between the brake pad non-fixed surface of the clamp and the actuator drive unit fixed to the vehicle body. The actuator drives the spring to expand and contract by the push buttons that hold the brake disc and are arranged in the cab. Brake structure of cargo handling vehicle that is driven as needed. 2. A brake structure for a cargo-handling vehicle according to claim 1, wherein the vehicle body is provided with a traveling speed detector, and a drive unit of the actuator is driven to expand and contract the spring in accordance with a value detected by the traveling speed detector. 3. The brake structure for a cargo handling vehicle according to claim 1, wherein the cargo handling device includes a cargo detector, and a drive unit of the actuator drives the spring to expand and contract in accordance with a value detected by the cargo detector.