JP2576635Y2 - Axle equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle device provided for an industrial vehicle such as a forklift or a wheel loader.

[0002]

2. Description of the Related Art Conventionally, there is an axle device of this type shown in FIGS. That is, the axle body 50 provided in the forklift or the wheel loader is
A pair of upper and lower horizontal frame plates 51, 52, and both horizontal frame plates 51, 52;
It is formed by a vertical frame plate 53 connected between 52. At both left and right ends of the axle body 50, king pins 54 are inserted between the upper horizontal frame plate 51 and the lower horizontal frame plate 52, respectively. A knuckle 55 that is rotatable in the horizontal direction about the king pin 54 is fitted to the king pins 54. To these knuckles 55, a hub 57 of a rear wheel 56 is attached.

A center arm pin 58 is inserted between the center of the upper horizontal frame plate 51 and the center of the lower horizontal frame plate 52, and a center arm 59 is horizontally inserted in the center arm pin 58. It is rotatably fitted to the outside. This center arm 59 and both knuckles 55 are tie rods
Connected at 60. Further, between the upper horizontal frame plate 51 and the lower horizontal frame plate 52, a cylinder device 62 is mounted via a bracket 61. This cylinder device 62
Of the piston rod 63 is connected to one knuckle 55. Also, before and after the center of the axle body 50,
Cradle pins 65 are provided to protrude forward and backward through a bracket plate 64 connected between the upper horizontal frame plate 51 and the lower horizontal frame plate 52. These cradle pins 65
Have a common front-rear direction axis 66, and are respectively inserted through a pair of front and rear support brackets 68 provided on the vehicle body frame 67 side so as to be swingable about the front-rear direction axis 66.

According to this, when the cylinder device 62 is operated, one knuckle 55 rotates left and right around the king pin 54, and the other knuckle 55 rotates through the center arm 59 and the tie rod 60. It rotates in the same direction in conjunction with the knuckle 55. Also, if a level difference occurs between one rear wheel 56 and the other rear wheel 56, for example, when traveling in a highly uneven area or when one rear wheel 56 rides on a stone, the axle Body 50 is a cradle pin
The vehicle body is tilted by swinging around the longitudinal axis 66 via the wheel 65, so that the tilt of the vehicle body is reduced.

[0005]

However, in the above-mentioned conventional type, there was a problem that the production of the axle body was complicated because the shape of the axle body was complicated.

An object of the present invention is to solve the above-mentioned problems and to provide an axle device having an axle body having a simple structure.

[0007]

In order to solve the above-mentioned problems, an axle device according to the present invention is provided with a flat axle body, and a pair of upper and lower protrusions are formed on both side surfaces of the axle body. A king pin is inserted between the upper projection and the lower projection, knuckles are provided on these king pins that are rotatable in the horizontal direction around the king pin, and a wheel hub is attached to these knuckles. A driving device for rotating the two knuckles in the same direction via a tie rod is provided on the side, and a support is provided for swingably supporting the axle body about a longitudinal axis.

[0008]

According to the above arrangement, when the driving device is operated, both knuckles rotate in the same direction about the kingpin, respectively, and the wheels are switched to the left and right. Also, even if the level difference occurs between one wheel and the other wheel due to running on a rough surface or one wheel riding on a stone, etc., the axle body will pass through the support according to the level difference. As a result, the vehicle body is tilted by swinging about the longitudinal axis, so that the tilt of the vehicle body is reduced.

By forming the axle body as described above into a single flat plate, the structure of the axle body is simplified, and the labor required for manufacturing the axle body is greatly reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a rear axle device provided at the rear of a forklift or a wheel loader. The rear axle device 1 has an axle body 2 made of a flat plate. In the middle part of the left and right side surfaces of the axle body 2, a notch portion 3 cut out toward the center side of the axle body 2 is formed. A pair of protrusions 4 and 5 are formed. Through holes 6 are formed in the upper projection 4 and the lower projection 5, and the upper and lower ends of the king pin 7 are inserted into these through holes 6, whereby the king pin 7 is connected to the upper projection 4 and the lower projection 5. Installed between.

A knuckle 8 is provided in the notch 3 so as to be fitted around the king pin 7 and to be rotatable in the horizontal direction about the king pin 7. A hub 10 of a rear wheel 9 is externally fitted to the knuckles 8. A steering cylinder device 12 for rotating the knuckles 8 in the same direction via a tie rod 11 is provided on the rear surface of the axle body 2.
(An example of a driving device) is attached. The steering cylinder device 12 is a double rod type hydraulic cylinder device. Both ends of a piston rod 13 are connected to both knuckles 8 via tie rods 11, respectively.

A cradle shaft 15 (an example of a support) having a longitudinal axis 14 is provided at the center upper portion of the axle body 2. This cradle shaft 15
Is inserted through a pair of front and rear support brackets 17 provided on the vehicle body frame 16 side so as to be swingable around a longitudinal axis 14.

The operation of the above configuration will be described below.
As shown in FIG. 2, when one of the piston rods 13 is protruded and the other is retracted by operating the steering cylinder device 12, one knuckle 8 rotates rightward through one tie rod 11, and the other knuckle 8 rotates. The other knuckle 8 also rotates clockwise via the tie rod 11. Thereby, both rear wheels 9 are turned rightward. Further, when turning both rear wheels 9 to the left, similarly, one of the piston rods 13 may be retracted and the other may be projected.

Further, as shown by a two-dot chain line (a) in FIG. 3, one of the rear wheels 9 and the other of the rear wheels 9 are driven by traveling on a place with severe unevenness or one of the rear wheels 9 riding on a stone. When a level difference occurs between the axle body 9 and the wheel 9, the axle body 2 is moved through the cradle shaft 15 in accordance with the level difference.
Swing around 14 and incline. As described above, since the axle main body 2 can be inclined with respect to the vehicle body frame 16, the inclination of the vehicle main body is reduced.

By using a single flat plate for the axle body 2 as described above, the structure of the axle body 2 is simplified, and the labor required for manufacturing the axle body 2 is greatly reduced. Further, since the steering cylinder device 12 is provided on the rear surface of the axle body 2 and the tie rod 11 is provided on the rear surface side of the axle body 2, the steering cylinder device 12 is provided.
During maintenance work of the tie rod 12 and the tie rod 11, the axle main body 2 does not hinder the work, and therefore, the maintenance work is very easy to perform.

Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. That is, in the first embodiment, the cradle shaft 15 is provided as an example of the support, but here, the cradle plate 25 is provided as another example of the support. The cradle plate 25 is attached to the upper center of the axle body 2 in the front-rear direction.
Are orthogonal to. At both front and rear ends of the cradle plate 25, through holes 26 are formed at front and rear centers of the axle main body 2 and penetrate through the left and right sides of the cradle plate 25. A rubber bush 27 is fitted into the through hole 26. A pair of support brackets 28 attached to the body frame 16 are provided on both sides of the front end and the rear end of the cradle plate 25. The cradle plate 25 and the body frame 16 are connected to the axle body 2 The front and rear support brackets 28 and the bush 27 are connected by connecting pins 29 in the left and right direction.

The operation of the above configuration will be described below.
That is, as shown by the two-dot chain line (b) in FIG. 5, the use of the rubber bush 27 causes the cradle plate 25 to swing around the longitudinal axis 14 with respect to the connecting pin 29 due to the deflection of the bush 27. Moveable. Therefore, when a level difference occurs between one rear wheel 9 and the other rear wheel 9, the axle body 2 is moved to the cradle plate according to the level difference.
It swings around the axis 14 in the front-rear direction via 25 and tilts. As described above, since the axle main body 2 can be inclined with respect to the vehicle body frame 16, the inclination of the vehicle main body is reduced.

Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. That is, a center arm hole 37 for mounting a center arm 36 is formed at the center of the axle main body 35 made of a flat plate, and a tie rod 38 through which a tie rod 38 is inserted is provided on both left and right sides of the center arm hole 37. Holes 39 are respectively formed. Each of these holes 3
Reference numerals 7 and 39 each have a square shape, and penetrate through the front and rear surfaces of the axle body 35.

The center arm hole 40 is inserted into the center arm hole 37 through an upper middle portion of the axle body 35.
, A center arm 36 is provided rotatably in the horizontal direction. The free end of the center arm 36 projects toward the front of the axle body 35,
The free end of the knuckle 8 is connected to the knuckle 8 by a tie rod 38. At this time, since the arm portion 41 of the knuckle 8 protrudes to the rear side of the axle main body 35, each tie rod 38 is inserted into the tie rod hole 39 from the front side of the axle main body 35.
And is connected to the arm portion 41 of the knuckle 8.

A steering cylinder device 42 (an example of a driving device) for rotating the knuckles 8 in the same direction via a tie rod 38 is attached to the rear surface of the axle body 35. The steering cylinder device 42 is a hydraulic cylinder device, and the tip of the piston rod 43 is
The knuckle 8 is connected to a cylinder arm 44 provided on the knuckle 8.

A cradle shaft 15 (an example of a support) having a longitudinal axis 14 is provided at the lower center of the axle body 35. This cradle shaft 15
Is inserted through a pair of front and rear support brackets 17 provided on the vehicle body frame 16 side so as to be swingable around a longitudinal axis 14.

The operation of the above configuration will be described below.
According to this, by operating the cylinder device 42,
One knuckle 8 rotates left and right around the king pin 7 and the other knuckle 8
The knuckle 8 rotates in the same direction with one knuckle 8 via the tie rod 38 and the tie rod 38. Thereby, both rear wheels 9 are turned in the same direction in the left and right directions.

Also, when a level difference occurs between one rear wheel 9 and the other rear wheel 9 when the vehicle travels on a highly uneven place or when one rear wheel 9 rides on a stone, the level difference is generated. Accordingly, the axle body 35 swings around the longitudinal axis 14 via the cradle shaft 15 and tilts. As described above, since the axle main body 35 can be inclined with respect to the body frame 16, the inclination of the vehicle main body is reduced.

When the first and second embodiments are compared with the third embodiment, the axle body 2 of the first and second embodiments is
Since the holes 37 and 39 do not need to be formed unlike the axle body 35 of the third embodiment, the manufacture is easier. Also,
The tie rod 11 of the first and second embodiments has an advantage that it can be shorter than the tie rod 38 of the third embodiment.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. That is, the axle device of the fourth embodiment is
A pair of upper and lower bearing support plates 45 and 46 are provided at both ends of the axle body 2 of the axle device 1 of the first embodiment. These bearing support plates 45 and 46 are respectively attached to the upper and lower surfaces of the axle body 2.
Of these, through holes 47 in the upper bearing support plate 45
A tapered roller bearing 48 for supporting the upper end of the king pin 7 is fitted in the tapered roller bearing 48. A tapered roller bearing 48 that supports the lower end of the kingpin 7 is covered with a cover 49 in the through hole 34 of the lower bearing support plate 46.
Is provided.

According to this, the bearing support plate 4
By providing 5, 46, even a large-sized tapered roller bearing 48 can be attached.
It is only necessary to increase the size of the bearing support plates 45 and 46 without increasing the thickness of the axle body 2 according to the size of the bearing 48. Therefore, it is economical and lightweight.

[0027]

As described above, according to the present invention, the structure of the axle body is simplified by forming the axle body into a single flat plate, and therefore the labor required for manufacturing the axle body is greatly reduced. It is easy to perform maintenance work such as driving devices.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the axle device.

FIG. 3 is a view in the direction of arrow A in FIG. 2;

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

FIG. 5 is a view in the direction of arrow B in FIG. 4;

FIG. 6 is a plan view of an axle device according to a third embodiment of the present invention.

FIG. 7 is a view as viewed in the direction of arrow C in FIG. 6;

FIG. 8 is a longitudinal sectional view of a connecting portion between an axle body and a kingpin of an axle device according to a fourth embodiment of the present invention.

FIG. 9 is a plan view of an axle device in a conventional example.

10 is a view in the direction of arrow D in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle device 2 Axle main body 4 Upper protrusion 5 Lower protrusion 7 King pin 8 Knuckle 9 Rear wheel 10 Hub 11 Tie rod 12 Cylinder device (drive device) 14 Front-rear axis 15 Cradle shaft (support) 25 Cradle plate (support) ) 35 Axle body 38 Tie rod 42 Cylinder device (drive device)

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 7/08 B62D 7/14-7/18

Claims (1)

(57) [Scope of request for utility model registration] A flat axle body is provided, a pair of upper and lower protrusions are formed on both side surfaces of the axle body, and a king pin is inserted between an upper protrusion and a lower protrusion. A knuckle that is rotatable in the horizontal direction about a kingpin, a wheel hub is mounted on these knuckles, and a drive for rotating the two knuckles in the same direction via tie rods on one of the front and rear surfaces of the axle body. An axle device provided with a device, and a support for swingably supporting the axle body about a longitudinal axis.