JP2576631Y2 - 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 A conventional axle device of this type is shown in FIG. That is, the axle housing 50 is formed by a pair of upper and lower axle plates 51, 52, and a reinforcing plate 53 is provided between the left and right ends of the axle plates 51, 52. Upper through holes 54 are provided at both left and right ends of the upper axle plate 51.
Are formed. An upper housing hole 55 is formed at a lower portion of the upper through-hole 54 and has a diameter larger than that of the upper through-hole 54. The upper housing hole 55 is formed on the lower surface of the upper axle plate 51. Bearings).

At the left and right ends of the lower axle plate 52, mounting holes are provided.
A case 58 is formed in the mounting hole 57 from below. A flange portion 59 is formed at a lower portion of the case 58, and the flange portion 59 is connected to a lower axle plate 52 through a bolt 60.
Is connected and fixed to the lower surface side of the. A lower housing hole 63 is formed in the upper surface of the case 58, and a lower tapered roller bearing 64 (hereinafter abbreviated as a lower bearing) is fitted into the lower housing hole 63.

[0004] A knuckle 66 is provided between the upper and lower axle plates 51 and 52 for turning the wheels 65 in the steering direction. That is, a stepped upper kingpin 67 is integrally formed at the upper end of the base end of the knuckle 66, and the upper kingpin 67 is fitted into the upper bearing 56 and the stepped portion 68
Is in contact with the lower surface of the upper bearing 56. A lower king pin 71 having a step is formed integrally with the lower end of the base end of the knuckle 66.The lower king pin 71 is fitted into the lower bearing 64, and the step 72 is formed in the lower bearing 64.
Is in contact with the upper surface of the With this, the knuckle 66
Upper and lower axle plates supported by upper and lower bearings 56 and 64
It is provided between 51 and 52 and is rotatable about a vertical axis 73.

A preload adjusting shim 74 is provided between the flange portion 59 of the case 58 and the lower axle plate 52. After adjusting the thickness of the shim 74, the upper and lower bearings 56, 64 are set in advance by a predetermined force by attaching the case 58 via the bolt 60 (preload adjustment).

[0006]

However, in the conventional structure described above, when changing the preload in the preload adjustment operation, the case 58 must be removed and the number of the shims 74 must be increased or decreased each time. Met.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an axle device that can easily perform a preload adjusting operation.

[0008]

In order to solve the above-mentioned problems, an axle device according to the present invention comprises an axle housing formed by a pair of upper and lower axle plates, and is provided between left and right ends of an upper axle plate and a lower axle plate. Insert a kingpin that is rotatable around the vertical axis, support the upper and lower ends of each kingpin with upper and lower bearings, and insert one end of the kingpin that protrudes to one side from between the upper and lower bearings. Forming a large diameter portion to be engaged with one of the upper and lower bearings, forming a threaded portion protruding from the other upper and lower bearings at the other end of the kingpin projecting to the other side, attaching a bearing nut to this threaded portion, A knuckle for turning the wheel in the steering direction is externally fitted to each kingpin and provided between both axle plates, and a fixture for fixing each knuckle and the kingpin is provided. Those digits.

[0009]

According to the above construction, by tightening the bearing nut, the distance from the bearing nut to the large diameter portion of the kingpin is reduced, so that the upper and lower bearings are pressed with predetermined forces, respectively, so that the upper and lower axles are pressed. Attached to the board side. Therefore, preload adjustment can be performed by one-touch by further tightening or loosening the bearing nut, so that the operation is easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 2 to 4, an axle device 2 for a rear wheel is provided at a rear portion of a forklift 1 which is an example of an industrial vehicle. The axle device 2 includes an axle housing 3, a knuckle 5 for turning the rear wheel 4 in a steering direction, and a king pin 6 for connecting and supporting the knuckle 5 to the axle housing 3. In the axle housing 3, a center arm 7, a pair of left and right tie rods 8, and a pair of left and right steering cylinders 9 for switching the rear wheel 4 in a steering direction in conjunction with a steering wheel (not shown) are incorporated. ing.

Hereinafter, the structure of the axle device 2 will be described. That is, as shown in FIG. 1, the axle housing 3 is formed by a pair of upper and lower axle plates 12 and 13,
A reinforcing plate 14 is provided between the left and right ends of the axle plates 12 and 13. Upper left and right ends of the upper axle plate 12 are formed with upper through holes 15, and lower right and left ends of the lower axle plate 13 are formed with lower through holes 16 facing the upper through holes 15. Above the upper through hole 15, an upper housing hole 17 opening to the upper surface of the upper axle plate 12 is formed with a larger diameter than the upper through hole 15, and below the lower through hole 16, a lower axle plate 13 is formed. A lower housing hole 18 that opens to the lower surface of the lower hole is formed to have a larger diameter than the lower through hole 16. Tapered roller bearings 19 and 20 are fitted in the upper housing hole 17 and the lower housing hole 18, respectively.

The king pin 6 is inserted between the upper and lower through holes 15 and 16, and the upper and lower ends of the king pin 6 are supported by the bearings 19 and 20. It is mounted rotatably. At the lower end of the king pin 6 protruding downward from the lower bearing 20, a large-diameter portion 24 that engages with the lower bearing 20 is formed. Further, screw portions 25 are formed at the upper end of the king pin 6 protruding upward from the upper bearing 19, and a bearing nut 26 having a smaller diameter than the upper bearing 19 is screwed to these screw portions 25.

The base end of the knuckle 5 is fitted on the king pin 6 and is mounted between the upper and lower axle plates 12 and 13. Reference numeral 27 denotes a lock bolt (an example of a fixture) for integrally fixing the knuckle 5 and the king pin 6. As shown in FIG. 3, the free ends of these knuckles 5 have bearings.
The hub 31 of the rear wheel 4 is connected via 30.

The lower end of the king pin 6 is housed in the lower housing hole 18, and the lower part of the lower housing hole 18 is a lower cover 33 detachably attached to the lower surface of the lower axle plate 13 via bolts 32. Covered by Also, upper housing hole 17 and bearing nut
The upper part of 26 is covered by an upper cover 35 detachably attached to the upper surface side of the upper axle plate 12 via bolts 34. Further, the gap between the upper through-hole 15 and the kingpin 6 and the gap between the lower through-hole 16 and the kingpin 6 are sealed with a sealing material 36, respectively.

As shown in FIG. 2, two kinds of horizontal arms 37, 38 projecting to one side are provided at the base end of each knuckle 5.
The tip of the tie rod 8 is connected to the arm 37, and the tip of the piston rod 39 of the steering cylinder 9 is connected to the arm 38.

The operation of the above configuration will be described below.
As shown by the imaginary line in FIG. 2, by rotating the steering, the center arm 7 rotates left and right,
The piston rod 39 of one steering cylinder 9 projects and the piston rod 39 of the other steering cylinder 9
39 exits. As a result, the left and right knuckles 5 rotate in the steering direction about the vertical axis 23, respectively, and the rear wheels 4 are each switched by a predetermined angle in the steering direction. At this time, the king pin 6 is connected to the upper and lower bearings 19,
20 supported by the knuckle 5 and the vertical axis
Rotate around 23.

As shown in FIG. 1, by tightening the bearing nut 26, the distance from the bearing nut 26 to the large diameter portion 24 of the kingpin 6 is shortened. It is mounted in the upper and lower housing holes 17, 18 while being pressed by the force of. Therefore, the preload adjustment can be performed by one-touch by further tightening or loosening the bearing nut 26, so that the operation is easy.

In the above embodiment, the upper through hole 15 and the upper housing hole 17 and the lower through hole 16 and the lower housing hole 18 can be formed from outside the axle housing 3, respectively, so that the processing is easy.

In the above embodiment, as shown in FIG. 1, the wheel load F (upward load in the vertical direction) from the knuckle 5 is received by the lower axle plate 13, so that the reinforcing plate 14 and the upper and lower axle plates It is possible to prevent the tensile stress from being concentrated on each connection portion 40 with the connection 12 and 13.

In the above embodiment, since the lower housing hole 18 is formed directly in the lower axle plate 13 and the lower bearing 20 is mounted, the case 58 (see FIG. 5) as in the conventional example can be dispensed with. Therefore, the number of parts can be reduced, and the dimension R from the vertical axis 23 to the left and right ends of the lower axle plate 13 can be set small, so that the axle housing 3 can be made compact.

In the above embodiment, the forklift 1 has been described as an example of an industrial vehicle, but it may be a wheel loader or the like. Further, in the above embodiment, the lock bolt 27 is provided as an example of the fixing tool, but this may be a lock pin or the like. Further, in the above embodiment, the axle device 2 may have a structure in which the axle device 2 is upside down.

[0022]

As described above, according to the present invention, by tightening the bearing nuts, the upper and lower bearings are pressed by predetermined forces, respectively, and mounted on the upper and lower axle plates. Therefore, the preload adjustment can be performed by one-touch by further tightening or loosening the bearing nut, so that the operation is easy.

[Brief description of the drawings]

FIG. 1 is a detailed view of a kingpin portion of an axle device according to an embodiment of the present invention.

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

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a rear view of a forklift equipped with the axle device.

FIG. 5 is a detailed view of a kingpin portion of a conventional axle device.

[Explanation of symbols]

 2 Axle device 3 Axle housing 4 Rear wheel 5 Knuckle 6 King pin 12 Upper axle plate 13 Lower axle plate 19 Upper bearing 20 Lower bearing 23 Vertical axis 24 Large diameter part 25 Screw part 26 Bearing nut 27 Lock bolt (fixing tool)

────────────────────────────────────────────────── ─── 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] An axle housing is formed by a pair of upper and lower axle plates, and a king pin rotatable around a vertical axis is inserted between left and right ends of an upper axle plate and a lower axle plate. The upper and lower ends are supported by upper and lower bearings respectively, and one end of the king pin protruding to one side from between the upper and lower bearings is formed with a large-diameter portion that engages with one of the upper and lower bearings, and At the other end of the protruding kingpin, a screw portion protruding from the other upper and lower bearings is formed, a bearing nut is attached to this screw portion, and a knuckle for turning the wheel in the steering direction is fitted to each kingpin so as to be outside. An axle device comprising: a fixing tool provided between axle plates to fix each knuckle and a kingpin.