JP2000159116A - Carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a carriage decreasing a number of part items, simplifying a mechanism, and generating a small inner wheel difference. SOLUTION: This carriage 1, connecting front wheel side connection levers 12R, 12L to both end parts of a common first connection lever 13, mounting front wheels 11R, 11L turnably in the front wheel side, connection levers 12R, 12L, mounting also rear wheels 21R, 21L turnably respectively in rear wheel side connection levers 22R, 22L, and connecting the front/rear wheel side connection levers 12R, 12L/22R, 22L respectively by second connection levers 23R, 23L, turns a steering handle 30. In this way, the front wheels 11R, 11L and the rear wheels 21R, 21L are turned in a reverse phase to each other, so as to eliminate an inner wheel difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truck for transporting luggage, parts and the like, and more particularly, to eliminate a difference in inner wheels so that a rear wheel follows a trajectory of a front wheel and to connect a plurality of trucks.
Even if you run and turn while towing the leading bogie,
The present invention relates to a bogie suitable for turning a corner of a narrow passage, with the second and subsequent bogies passing substantially the same trajectory as the first bogie.

[0002]

2. Description of the Related Art A general conventional truck has a pair of left and right front wheels which are rotatably mounted on a lower surface of a loading platform and a pair of left and right rear wheels are fixed, and a corner of a passage is provided. When the vehicle turns, an inner wheel difference always occurs between the front wheel and the rear wheel. For this reason, if multiple trucks are connected to transport a large number of parts at once to increase transport efficiency, the inner ring difference will increase in proportion to the number of connected trucks, and the passage will have a sufficient width. Must be secured,
The maximum number of connected units was about three. In order to eliminate such drawbacks, eliminate the difference in front wheel inner wheels so that the rear wheel follows the trajectory of the front wheel so that it can pass and transport even in narrow corner passages, connect multiple bogies, and pull the leading bogie In the past, many bogies that allow the second and subsequent bogies to follow the same trajectory as the first bogie and bend the corners of narrow passages while traveling and turning have been proposed in the past and have been put into practical use. Has also been.

[0003]

There are two types of four-wheel steering devices provided to eliminate the front wheel inner wheel difference, such as a pantograph type and a rod link type. Japanese Patent Application Laid-Open Publication No. H10-67976 “Apparatus for bogies” can be cited as an example of a patent that discloses the former pantograph type four-wheel steering device, and the latter is a rod link type four-wheel steering device. Published patents or utility models include Japanese Unexamined Patent Application Publication No. 05-246346 “Transportation Dolly”, Japanese Unexamined Patent Application Publication No. 09-315335 “Dolly”, and Registered Utility Model 3037.
640 "steering device for towed truck". However, the four-wheel steering devices disclosed in these publications have a problem that the number of parts is large, the mechanism is complicated, the assembling man-hour is required, and the truck becomes expensive.

An object of the present invention is to solve the above problems, and an object of the present invention is to reduce the number of parts and obtain a bogie in which a mechanism can be simply assembled.

[0005]

In order to achieve the above-mentioned object, a truck according to the present invention comprises a carrier, a lower axle disposed on the lower surface of the carrier, and a parallel axle on the lower surface thereof. A pair of left and right front wheels, and a pair of left and right rear wheels disposed on the lower surface of the carrier and having a parallel axle on the lower surface thereof, and supporting a rear portion thereof, attached to the carrier, A steering member rotatable in a towing direction, a front wheel steering device for turning the front wheel in the rotation direction in conjunction with the rotation of the steering member, and a turning of the front wheel in association with the rotation of the steering member A rear wheel steering device for turning the front wheel rear wheel in a direction opposite to the direction, and a bogie configured such that the rear wheel does not generate an inner wheel difference with respect to the front wheel during turning, the front wheel steering device includes: Each of the vehicles in a plane parallel to the lower surface of the bed Are formed integrally with a bracket that supports the left and right front wheels, and long holes at an inclination angle for eliminating an inner wheel difference between the pair of left and right front wheels are formed in the opposite opening directions from the center of rotation of each wheel to the rear. A plate-shaped front wheel-side connection lever and both ends are connected to the respective long holes of the connection lever, and the carriage slides at a central portion in a state in which the bogie goes straight and substantially orthogonal to each axle of the pair of left and right front wheels. A first connecting rod that is freely supported and the steering member that is connected at the center of the first connecting rod and that is pivotally supported on the lower surface of the loading platform in front of the position where the first connecting rod is provided. The rear wheel steering device is formed integrally with a bracket supporting each wheel in a plane parallel to the lower surface of the loading platform, and in order to eliminate an inner wheel difference between the pair of left and right rear wheels, Parallel to the inclination angle of the long hole of the front wheel side connection lever, A plate-shaped rear wheel-side connecting lever formed at an inclination angle in a direction from the rear of the center of rotation of each wheel toward the front and narrowing in a direction opposite to each other, and having a lever ratio of 1: 1 to the front wheel-side connecting lever; One end is rotatably connected to a front portion of the front wheel side connection lever that intersects a line connecting a rotation center of a wheel of the front wheel and an outer end of a long hole of the front wheel side connection lever, and the other end is provided. The above object is achieved by a pair of left and right second connecting rods rotatably connected to the distal end of the rear wheel connecting lever.

Therefore, according to the bogie of the present invention, a four-wheel steering device capable of eliminating the inner wheel difference with a small number of parts can be constructed, and a plurality of the bogies are connected to run and turn while towing the leading bogie. Even in this case, the second and subsequent trucks follow substantially the same trajectory as the first truck, and therefore can be easily passed even at a corner of a narrow passage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bogie according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a bogie as viewed from the lower surface of a luggage carrier, showing a steering state when the vehicle is moved straight ahead according to the embodiment of the present invention. FIG. 2 shows a steering state when turning from the steering state of the bogie shown in FIG. FIG. 3 is a plan view of the truck viewed from the lower surface of the carrier, FIG. 3 is a side view showing a state where a plurality of trucks are connected, and FIG. FIG. 5 is a plan view showing a traveling state when the vehicle is in a running state, and FIG. 5 is a plan view showing a traveling state when a plurality of trolleys according to the embodiment of the present invention are connected and U-turned.

In FIG. 1, reference numeral 1 generally indicates a carriage according to an embodiment of the present invention. The cart 1 incorporates a four-wheel steering device 3 which is a feature of the present invention, on the lower surface (rear surface) of a carrier 2 formed of a flat base plate. The four-wheel steering device 3 includes a front-wheel steering device 10, a rear-wheel steering device 20, and a steering handle 30 as a steering member. Note that, in FIGS. 1 and 2, the loading platform 2 is drawn by a two-dot chain line in order to make the four-wheel steering device 3 easy to understand.

The front wheel steering device 10 includes a pair of left and right front wheels 11R and 11L, and front wheel side connecting levers 12R and 12L.
, One first connecting rod 13 and front wheel steering bracket 14
It is composed of The front wheel steering bracket 14 has a substantially I-shaped shape in which a central portion has a slightly longer rectangular portion and both end portions have a substantially square portion, and the central rectangular portion is slightly lifted from the lower surface of the carrier 2. A swelling steering handle fixing plate portion 141 and a slide receiving portion 142R of the connecting rod 13 slightly swelling such that at least a side surface of the square portion on both ends thereof on the rear wheel steering device 20 side also rises from the lower surface of the carrier 2; 142L are formed. Further, openings 143R and 143L are formed in the both end portions of the front wheel steering bracket 14 so as to allow the front wheels 11R and 11L having a structure described later to be inserted. The front wheel steering bracket 14 is fixed to a lower surface of a front portion of the carrier 2.

The front wheels 11R and 11L support the front of the bed 2 and have axles 111R and 1L parallel to the lower surface of the bed 2.
The brackets 112R, 112L having 11L are rotatably supported by axles 111R, 111L (FIG. 3), respectively. These brackets 112R, 112L are respectively attached to the bearing members 113R, 113L to which the axles 111R, 111L are attached, and the
Fixing members 114R, 114L for fixing 112L
And the bearing members 113R, 113
L is rotatably supported by the fixing members 114R and 114L, respectively. On the lower surface of the carrier 2, the portions of the fixing members 114R and 114L inserted from the openings 143R and 143L of the front wheel steering bracket 14 are screwed. It is fixed with screws and fixed firmly. The symbol Pa is the front wheel 11
R, indicates the center of rotation of 11L.

The front wheel-side connecting levers 12R, 12L are integrally formed at right angles to the side surfaces of the bearing members 113A, 113B of the brackets 112R, 112L in a plane parallel to the lower surface of the carrier 2. A long hole 12 formed at an inclination angle (θa, θb) for eliminating a difference in the inner wheel between the pair of left and right front wheels 11R, 11L.
1R and 121L are formed rearwardly from the center of rotation of each of the front wheels 11R and 11L in opposite open directions.

The inclination angles (θa, θb) of the elongated holes 121R, 121L are set so that the inner ring is oriented in a tangential direction of the circumference of the locus drawn by the inner ring with respect to the turning center of the bogie 1.
Further, the outer ring is also formed at an angle that regulates the outer ring to face in a tangential direction of a circumference of a locus drawn by the outer ring.

The first connecting rod 13 has an engaging pin 131 at its center and connecting pins 132R, 132 at its both ends.
L are formed, and the connection pins 132R, 132
L is inserted into the long holes 121R and 121L of the front wheel side connection levers 12R and 12L, respectively, and is rotatably connected. The state of the connected first connecting rod 13 is shown in FIG.
, The axles 111R, 111L of the pair of left and right front wheels 11R, 11L in which the bogie 1 is in a straight traveling state.
Are substantially symmetrically connected to each other in a substantially perpendicular state.

The steering handle 30 is connected to a base end connecting part 31 and a front end connecting part 32 (see FIG. 1) which is connected to the base end connecting part 31 by a structure that can be bent above the carriage 1 around a rotation shaft 33. 3) and the base end connecting portion 31
, And a connecting round hole 35 is formed at the tip of the tip connecting portion 32. The steering wheel 30 includes a front wheel steering bracket 1 whose base end connecting portion 31 is located at a position forward of a position where the first connecting rod 13 is provided.
4 is attached so as to be rotatable about a rotation center shaft 141A provided at the center of the steering handle fixing plate portion 141, and the engagement pin 131 of the first connection rod 13 is provided in the connection round hole 35. Is engaged. Accordingly, when the distal end connecting portion 32 of the steering handle 30 is turned left and right, the base end connecting portion 31 is turned left and right in opposite directions, and the first connecting rod 13 is freely turned left and right by the engaging pin 131. Can slide.
Reference numeral 36 in FIG. 3 denotes a push handle fixed vertically to the front portion of the loading platform 2.

The rear wheel steering device 20 includes a pair of left and right rear wheels 21R and 21L, and rear wheel side connecting levers 22R and 22L.
And a pair of second connecting rods 23R and 23L. The rear wheels 21R, 21L support the rear of the bed 2 and have axles 211R, 211L parallel to the lower surface of the bed 2.
Brackets 212R and 212L having (FIG. 3) are rotatably supported on axles 211R and 211L, respectively. These brackets 212R and 212L are
Bearing member 213 to which 1R and 211L are attached
R, 213L and the loading platform 2 with the respective brackets 212R, 212
L, and fixing members 214R and 214L for fixing L (FIG. 3).
3L is rotatably supported by the fixing members 214R and 214L, respectively. The fixing members 214R and 214L are screwed to the lower surface of the carrier 2 with screws or the like, and are firmly fixed.

The rear wheel side connection levers 22R, 22L are integrally formed at right angles to the side surfaces of the bearing members 213R, 213L of the brackets 212R, 212L in a plane parallel to the lower surface of the carrier 2. A pair of left and right front wheel side connection levers 12R, 12L.
Are formed at an inclination angle parallel to the inclination angles (θa, θb) of the long holes 121R, 121L.
In order to eliminate the inner ring difference of 1L, the long holes 121R, 12R
1L, each of the rear wheels 21R,
The ratio of the lever length to the front wheel side connecting levers 12R and 12L is 1, that is, La: Lb = It is formed of a plate-like lever set at 1: 1 (FIG. 2).

Of the pair of left and right second connecting rods 23R and 23L, one end of the second connecting rod 23R has a rotation center Pa of the front wheel 11R and an elongated hole 12 of the front wheel side connecting lever 12R.
The front wheel-side connecting lever 12R is rotatably connected to a front-side rotating shaft 122R that intersects a line connecting the outer end of the rear wheel-side connecting lever 12R. It is rotatably connected to the driving shaft 221R. Also, the second
The connecting rod 23L has a pivot axis at a front portion of the front wheel-side connecting lever 12L, which has one end crossing a line connecting the center of rotation Pa of the front wheel 11L and the outer end of the long hole 121L of the front wheel-side connecting lever 12L. 122L is rotatably connected to the other end, and the other end is a rotation shaft 22 at the tip end of the rear wheel side connection lever 22L.
It is rotatably connected to 1L. As described above, the front wheel side connection levers 12R, 12L and the rear wheel side connection levers 22R, 22R,
2L is connected with the second connecting rods 23R and 23L, respectively.

At the center of the rear end of the loading platform 2, a connecting member 40 having a connecting pin 41 provided upward at the front end is fixed. When connecting a plurality of trolleys 1, the front end connecting portion 32 of the steering handle 30 of the front trolley 1 is lifted slightly upward, and the connecting round hole 35 formed in the front end connecting portion 32 is connected to the subsequent round hole 35. After being brought onto the connecting pin 41, the leading end connecting portion 32 is lowered, and the connecting round hole 35 is inserted into the connecting pin 41, whereby the succeeding bogie 1 can be connected to the front bogie 1.

Next, the operation of the bogie 1 according to the present invention will be described with reference to FIGS. Now, FIG.
When the steering wheel 30 is turned to the left as shown in FIG. 2 (FIG. 2 shows the lower surface of the truck 1) from the straight traveling state shown in FIG.
With the center of rotation 141A of the steering handle fixing plate 141 as the center, the connecting slot 34 of the base end connecting portion 31 swings rightward, so that the first connecting rod 13 slides rightward,
The front wheel side connection levers 12R, 12L rotate clockwise (counterclockwise in the state of FIG. 2), and the front wheels 11R, 11L rotate left.

Further, with the rotation of the front wheel side connecting levers 12R and 12L, the second connecting rod 23R is pulled forward, and the rear wheel side connecting lever 22R is turned counterclockwise (clockwise in the state of FIG. 2). The rear wheel 21R also rotates counterclockwise about the rotation center Pb. At the same time, the second connecting rod 23L is pushed rearward, and the rear wheel connecting lever 2
2L is rotated counterclockwise (clockwise in the state of FIG. 2), and the rear wheel 21L is also rotated counterclockwise about the rotation center Pb. Therefore, the front wheels 11R and 11L are cut leftward, and the rear wheels 21R and 21L are cut rightward. As a result, the rear wheels 21R and 21L pass along the trajectory drawn by traveling by the front wheels 11R and 11L, and can be rotated or turned without a difference between the inner wheels. Also, when turning the steering wheel 30 to the right and turning or turning the bogie 1 to the right, the components of each part only perform the opposite operation, and similarly, the turning or turning can be performed to the right. it can.
That is, according to the four-wheel steering system 3 of the present invention, the front wheels 11R,
11L and the rear wheels 21R and 21L can be rotated in opposite phases, and the inner wheel difference at the time of rotation or turning can be almost eliminated.

Therefore, as shown in FIG. 4, a plurality of trucks 1 having a width of 600 mm and a length of 900 mm, three trucks 1 in the illustrated case, are connected as described above, and the leading truck 1 is connected.
While pulling or pushing the push handle 36, the width Wa
However, even in the case of passing through a crank-shaped passage of, for example, about 1,000 mm, these bogies 1 are turned by turning the steering wheel 30 left and right at the crank portion.
Can rotate on the same trajectory and pass easily,
Also, as shown in FIG. 5, even when the three carts 1 are similarly connected and turned in a passage having a width Wb of about 2,500 mm, the turning can be easily performed.

The front-wheel-side connecting levers 12R and 12L and the brackets 11 for the front wheels 11R and 11L in the above embodiment.
2R, 112L, and rear wheel side connection levers 22R, 22L
And brackets 212R and 212L for the rear wheels 21R and 21L.
May be individually formed parts, and may be integrally formed as a single part from the beginning from the viewpoint of reducing the number of parts.

[0023]

As is clear from the above description, according to the bogie of the present invention, the inner bogie difference is substantially eliminated so that the rear wheels follow the trajectory of the front wheels, and a plurality of bogies are connected to each other to form the first bogie. Even when the vehicle is run and turned while towing the vehicle, the vehicles subsequent to the second vehicle follow almost the same trajectory as the first vehicle, and a vehicle suitable for turning the corner of a narrow passage is obtained. An inexpensive bogie having a small number of parts, a simple structure, and a simple structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a bogie of a preferred embodiment of the present invention, showing a steering state when the vehicle is driven straight ahead, as viewed from the lower surface of a carrier.

FIG. 2 is a plan view of the bogie as viewed from the lower surface of the carrier, showing a steering state when the bogie shown in FIG. 1 is turned from the steering state.

FIG. 3 is a side view showing a state where a plurality of carts are connected.

FIG. 4 is a plan view showing a running state when a plurality of trolleys according to the embodiment of the present invention are connected and passed through a crank-shaped passage.

FIG. 5 is a view showing a state in which a plurality of trolleys according to the embodiment of the present invention are connected to each other and
It is a top view which shows the driving | running state at the time of turning.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... The bogie of embodiment of this invention, 2 ... Carrier, 3 ... Four-wheel steering device, 10 ... Front-wheel steering device, 11R, 11L ... Front wheel, 1
12R, 112L: bracket, 12R, 12L: rear wheel side connection lever, 121R, 121L: long hole, 13: first
Connecting rod, 20: rear wheel steering device, 21R, 21L: rear wheel,
22R, 22L ... rear wheel side connecting lever, 23R, 23L ...
2nd connecting rod, 30 ... steering wheel, Pa, Pb ... center of rotation

Claims (1)

[Claims] A pair of left and right front wheels that are provided on a lower surface of the carrier, and that are provided on a lower surface of the carrier, and that support a front portion of the carrier, and that are disposed on a lower surface of the carrier. A pair of left and right rear wheels supporting a rear portion thereof, a steering wheel attached to the carrier, and being rotatable in a towing direction of the carrier, interlocked with the rotation of the steering member; A front wheel steering device that turns the front wheel in the turning direction, and a rear wheel steering device that turns the front wheel and the rear wheel in a direction opposite to the turning direction of the front wheel in conjunction with the turning of the steering member. A bogie provided such that the rear wheel does not generate an inner wheel difference with respect to the front wheel when turning, wherein the front wheel steering device supports the wheels in a plane parallel to the lower surface of the carrier. And a pair of left and right front wheels A plate-shaped front-wheel-side connection lever in which a long hole at an inclination angle for eliminating a difference in an inner ring is formed in a direction that opens backward and opposite from the center of rotation of each wheel; A first connecting rod slidably supported at a central portion in a state of being substantially orthogonal to the axles of the pair of left and right front wheels in a state where the bogie is running straight, and And the steering member pivotally supported on the lower surface of the carrier in front of the position where the first connecting rod is disposed, and the rear wheel steering device comprises: a lower surface of the carrier. Are formed integrally with the bracket supporting each of the wheels in a plane parallel to the rear wheel, and in order to eliminate the inner wheel difference between the pair of left and right rear wheels, in parallel with the inclination angle of the long hole of the front wheel side connection lever, Narrowing opposite to each other from the rear to the front of the center of rotation of each wheel A plate-shaped rear wheel-side connection lever formed at an inclination angle in the direction of the front wheel and having a lever ratio of 1: 1 to the front wheel-side connection lever; one end having a rotation center of the front wheel and the front wheel-side connection lever. Is rotatably connected to a front portion of the front wheel-side connection lever that intersects a line connecting the outer end of the long hole, and the other end is rotatably connected to a front end portion of the rear wheel-side connection lever. And a pair of left and right second connecting rods.