JPS5873472A - Steering mechanism for order picking truck - Google Patents

Abstract

PURPOSE:To reduce electric power consumption as well as to cut running costs, by rotating a hydraulic pump directly with rotation of a steering handle and causing a turning wheel to be turned by oil pressure this hydraulic pump produces. CONSTITUTION:A turning wheel 12 is turned by turning operation of a steering handle 26 via a steering mechanism 25 which is provided with a hydraulic unit 27 producing oil pressure through rotation of the steering handle 26 and also a hydraulic motor 28 driving the turning wheel 12 with oil pressure produced by the hydraulic unit 27. This hydraulic unit 27 consists of a pump unit 29 and a hydraulic fluid tank 30 while the pump unit 29 is made up of a hydraulic pump 31 whose input shaft is rotated by the rotary shaft of the handle 26 and a directional control valve (selector) 32 being switched either in accordance with a rotational direction of said input shaft of the hydraulic pump 31.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering wheel for an order picking truck.

In recent years, space within the factory, or even within the distribution control hall [more A
As they are used for mold removal, order picking trucks are increasingly being used for handling cargo in narrow aisles.

Conventionally, such order picking trucks or ckl
As an example of a one-machine ship, the one shown in Figure wJJ1 is known.

This Kaji J & Shinkaku transmits the rotation of the handle to the turning wheel using a chain or wire, and between the handle 1 and the turning wire pulley 2 that causes the round wheel to turn, there is a 1, a sprocket 4 attached to the handle shaft 3, a wire pulley 5 supported on the driver's seat, a wire pulley 6 supported on the top of the mast, and a wire pulley 7 supported on the single frame of the order picking truck.
A turning operation is performed by sequentially rotating them simultaneously using a chain 8 and a series of wires 9.

By the way, using the chain 8 and wire 9 like this,
In a steering mechanism in which the turning wheels are turned through several sets of pulleys whose rotating axes are orthogonal to each other, in order to maintain accurate turning performance, the wire 9 and each pulley 5.6 are
, 7, it is necessary to maintain tension on the wire 9 to prevent slippage between the wire 9 and the wire 9.

To do this, it is necessary to periodically check the elongation of the M wire 9 during use, and check the turnbuckle 10 installed in the middle of the wire 9.
The elongation of the S wire 9 had to be absorbed by the above methods, making maintenance work extremely troublesome.

Furthermore, in a steering system using a chain or wire, the position of each pulley and other devices must be adjusted so that the wires attached to each pulley do not come into contact with other equipment installed on the order picking truck. The layout of each device must be determined, and the degree of freedom in arranging the device is limited, so a great deal of effort is required when designing the arrangement of each pulley and device.
In order to solve this problem, a rudder*m structure that employs a hydraulic power steering system is being considered.

This power steering type steering wheel uses a hydraulic actuator to turn the turning wheels, and a hydraulic pump in the power unit that sends hydraulic oil to the tuator, which is constantly operated by a battery-driven electric motor, and from a tank. The pumped hydraulic oil is circulated in a closed circuit inside the power unit when the order picking truck moves straight.
Only when the order picking truck turns, the signal is sent to the hydraulic actuator to operate the turning wheels.

However, since order picking trucks normally travel in a straight line for much longer than they do in turns, it is difficult to keep the hydraulic oil constantly circulating with an electric motor due to conduit resistance, etc. Including obsession,
The loss of Kanashi's Arashi-kikata was completely eliminated, and the running cost was reduced to 100,000 yen.

The present invention has been made in consideration of the above-mentioned circumstances.The input shaft of a hydraulic pump is connected to the rotating shaft of the steering handle of an order picking truck, and the hydraulic pump is driven by the rotation of the steering handle to supply hydraulic oil. To provide a steering mechanism which facilitates maintenance work and reduces running costs by sending signals to an actuator for turning the turning wheels to operate the turning wheels when a truck turns.

Hereinafter, this invention will be illustrated in FIGS. 2 to 6. I! This will be explained based on an example.

FIGS. 2 and 2 show an embodiment of an order picking truck to which the present invention is applied, and the reference numeral 11 in the figures is the truck body.

This truck body 11 has swing wheels (driving wheels) 12 arranged at the front of its lower part (upper side in Figure 2), and fixed wheels (IEIIIJ wheels) 13 arranged at the rear of its lower part.
Furthermore, a mast 14 is erected on the upper surface.

This mast 14 supports a driver's seat 15 arranged at the rear of the truck body 11 (lower part in FIG. 2) and a fork 1o for various purposes that is integrated with this driver's seat in a vertically movable manner. Both sides (111tfl between left and right in Figure 2)
In S), an outer mast 17 that acts as a kite when the driver's seat 15 moves up and down is held in an identified manner. An inner mast 18 is provided inside the outer mast 17 and moves up and down along the outer mast 17 using hydraulic pressure or the like, and the inner mast 18 has an east-west arm 19 integrated with the front reversible seat 15. When the first car is moved, the driver's seat 15 is held so that the second cover moves accordingly.

As shown in FIG. 4, the single swinging wheel 12 has a driving wheel swing bearing 21, which is supported by a driving wheel fixing bracket 20 fixed to the truck body 1. It is driven by 迄24.

The turning wheel 12 is operated via the steering mechanism 25.
This is done by rotating the steering handle 26 arranged on the side wall 15 & of the operation p615.

That is, as shown in FIGS. 2 to 6, the steering mechanism 25 includes a hydraulic unit 27 that generates hydraulic pressure by the rotation of the steering handle 26, and a hydraulic unit 27 that generates hydraulic pressure by the hydraulic unit 27. A sluggish, high torque type hydraulic motor 28 is provided to rotate the swing wheel 12.

The hydraulic unit 27 includes a pump unit 29 that sends hydraulic oil to the hydraulic motor 28, and a pump unit 29 that supplies hydraulic oil to the hydraulic motor 28.
A tank 30 is provided adjacent to the pump unit 9 and supported by the wall 151 of the driver's seat 15, and in which hydraulic oil to be supplied to the pump unit 29 is stored.

The pump unit 2g has a steering handle 26.
A hydraulic pump 31 whose input shaft is rotated by a rotating shaft 26 & of the hydraulic pump 31 and an operating flow that pumps water from a tank 30 and sends it to a hydraulic motor 28 according to the rotation direction of the input shaft of this hydraulic pump 31. By controlling the directional control valve 32, it becomes an inlet/outlet for hydraulic oil from the tank 30 and the left and right boats 29&, 29k) connected to the left (9) diversion boat 28& and the right rotation boat 28blpZ of the hydraulic Tanabata 28. Suction boat 290. A return embossment) 29d is formed, and a suction boat 290 and a return embossment 290 are formed.
cL is communicated therein through the check valve 38, and the working fluid is returned from the suction boat 2) 29 +l [+ to the suction boat 2
9011III has made it huge.

Fr1Ji! The unit 29 is attached to the wall 15az1 of the driver's seat 15 with a fastener such as a bolt or nut via a unit mounting bracket 35 that includes a bearing 34 that supports the rotating shaft 20a of the steering handle 20.
ν is attached.

The left and right boats 29&, 29b of the pump unit 29 have high pressure hoses 3'/a, 37 supported by a hose pulley 36 attached to the upper part of the inner mast 18, respectively.
The boat 2 for left rotation of the hydraulic motor 28 via b
The suction boat 290 is communicated with the tank 30 via the filter 38, and the return boat 29cl is closed by a plug b.

Return boat 29 (l was blocked by pump unit 2
This is to facilitate circulation of the hydraulic oil filled in the steering wheel 9 and reduce the force required to operate the steering handle 26 when turning.

The hydraulic motor 28 is fixed to the truck body 1 integrally with the driving wheel running bracket 20 via a bracket 39 . The rotating shaft of the hydraulic motor 23 is provided with a pinion 41 that engages with a turning gear 40 identified on the drive shaft device 123 via a bolt or the like to turn the drive shaft device 23, that is, the swing wheel 12. .

The operation of this invention will be explained below.

First, a case in which the order picking truck moves straight will be explained.

When the steering handle 26 is stationary, the sixth
As shown in the figure, the flow path within the pump unit 29 is in a neutral state 69, the flow path between the pump unit 29 and the hydraulic motor 28 is in a closed circuit, and the flow path between the pump unit 29 and the hydraulic motor 28 is in a closed circuit.
Since the hydraulic pump in 9 does not operate, the hydraulic oil in these channels does not move, and the rotation 111!1jiLI+dl 2 becomes [
! It becomes a state where 1 is added. Therefore, in order to move the order picking truck straight, the steering handle 26 must be
Just keep it stationary in a neutral state.

Next, a case will be described in which the order picking truck is turned to the right.

When the steering handle 26 is rotated clockwise, the hydraulic pump 31 of the pump unit 29 rotates and the directional control valve 32 operates, causing the flow path in the pump unit 29 to rotate to the right (B) as shown in the seventh factor. Changes to The prepared oil sucked from the tank 30 by the hydraulic pump 81 is
As shown by arrows in FIG. 7, the fluid flows sequentially through the pump unit 29 and is sent to the hydraulic motor 2B via the high-pressure hose 3'7b, causing the swing wheel 12 to swing to the right. The hydraulic fluid discharged from the hydraulic motor 28 then returns to the pump unit 29 via the double-sided hoses 37a, and is sucked through the check valve 33 and discharged into the flow path on the boat 29C side. At this time, when the steering wheel 26 is rotated to the right after the steering wheel is pulled, the hydraulic oil filled between the pump unit 29 and the hydraulic motor 28 is circulated through the same path, and the turning wheel 12 is closed to the lid according to the flow rate. Turn right only.

When the rotation of the steering handle 20 is stopped, the suction of the hydraulic pump 81 is stopped and the directional control valve 32 is stopped.
operates, and the flow path in the pump unit 29 is in the neutral state shown in FIG. 6, that is, the hydraulic motor 28 and the hydraulic pump 8
1 is closed, the rotating shaft of the hydraulic motor 28 is fixed, and the swing wheel 12 is fixed.

Next, a case will be described in which the order picking truck is turned left (B). In this case, the steering handle 26 only needs to be rotated to the left in the same way as when turning right, and the hydraulic pump 31 is driven by the rotation of the steering handle 20. At the same time, the flow path in the pump unit 29 is turned to the left, and the swing wheel 12 is turned to the left by the hydraulic oil flowing in the direction opposite to the arrow shown in FIG.

As explained above, in this invention, the rotation of the steering handle directly turns the hydraulic pump, and the hydraulic pressure generated by this hydraulic pump is used to turn the swing wheels. Not only does it not require a power source such as an electrically controlled motor like a steering-type steering system, but it also eliminates the needless use of batteries due to the operation of the steering system, reducing manufacturing costs and running costs. can be made into mm.

In addition, the hydraulic unit that sends hydraulic oil to the hydraulic motor is installed near the driver's seat with the tank storing hydraulic oil and the hydraulic pump close together, so it is supported by the mast of the truck body and the hydraulic Only two high-pressure hoses are needed to connect the pump unit and hydraulic motor, which serve as the flow path for the pump. For this reason, the steering mechanism uses a conventional power steering system, with the tank placed at the bottom of the truck body.Two high-pressure hoses are used for suction from the tank and for return, and one for feeding and returning to the actuator. Compared to a 1ttA high-pressure hose supported on the mast, visibility is much wider and safety when driving is increased.

Furthermore, since the rotation of the steering wheel is transmitted to the turning wheels using fluid (hydraulic oil), compared to the conventional steering wheel that transmits rotation using chains and wires via gears and pulleys. There is uniformity in the mounting position of the device, and there are many effects such as reducing the labor involved in designing the layout of the device and eliminating the hassle of maintenance work.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a conventional rudder pick-up system, Figs. 2 to 6 show an embodiment of the present invention, Fig. 2 is a plan view of an order picking truck, and Fig. 3 is a plan view of an order picking truck. Figure 2 is a view along the arrow line along the straight line, Figure 4 is a detailed tP view of the support section in Figure 2, Figure 5 is a partially cross-sectional view along V-V@ in Figure 3, FIG. 6 is a symbol diagram of the hydraulic circuit of the present invention, and FIG. 7 is an explanatory diagram of the operation of the present invention. 12... Rotating (2) wheel (drive shaft), 15...
...Driver's seat, 15 &... @ Hui, 18... Inner square), 21% 22... Wheel turning @ Uke, 25.
... Steering mechanism, 20 ... Steering handle, 20a ... Rotation shaft 28 ... Hydraulic motor, 28a - Left rotation boat, 28b ... Right rotation Pump unit, 29a...
・Pressure port, 29b...Right boat, 29a...
・・Suction bow), 29 (L・return boat, 30・・
...tank, 31.4 hydraulic pump, 32.curved check valve 33..check valve, 36..ho pulley, 37a, 37b--pressure hose. Figure 2 11″71 Figure 4 511 Figure t

Claims (1)

[Claims] A steering mechanism for an order picking truck that operates a swing wheel by driving a pump unit by rotating a steering handle to send hydraulic fluid from a tank provided at a driver's seat to a hydraulic motor that rotates the swing wheel, The pump unit includes a hydraulic pump whose input shaft is connected to the rotating shaft of the steering handle, and a hydraulic pump and a hydraulic sweater that switch connections between the boats depending on the rotational direction of the hydraulic pump to supply hydraulic oil. A steering mechanism for an order picking truck is equipped with a directional control valve that changes the direction of inflow to the hydraulic motor and returns hydraulic fluid from the hydraulic motor to the suction port of the hydraulic pump via a check valve. .