JPS5837693Y2 - Mounting structure of axle center member in forklift - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steering device for a forklift, and particularly to a mounting structure for an axle center member.

The steering device in conventional forklifts is the first
As shown in the figure.

In the figure, 1 is a steering wheel, 2 is a steering gear that converts the rotating motion of the steering wheel 10 into a swinging motion of the pitman arm 3, and 5 is a steering gear that converts the swinging motion of the pitman arm 3 transmitted through the drag link 4 to a pin 6. It is a bell crank that changes the horizontal rocking motion around the center.

This bell crank 5 is pivotally supported on an axle center member 10 having knuckle arms 8, 8 attached to both ends, and its swinging motion is transmitted to the knuckle arms 8, 8, respectively, by a pair of tie rods 7.7. , the knuckle arm swings, that is, performs steering.

As shown in detail in FIG. 2, the axle center member 10 is made by integrating horizontal members 11 and 12 arranged above and below with a plurality of vertical members 13, 13, and vertical holes 14 and 14 provided at both ends thereof. The knuckle arms 8, 8 are pivotally supported, and the bell rank 5 is supported by a pin 6 in a hole 15 provided approximately in the center shaft.

In the axle center member 10 itself, swing center shafts (mounting shirts) 9.9 are installed in the longitudinal direction on the longitudinal members 13, 13 at the front and rear ends, respectively. By being supported by a pair of bearings 17 and 18 fixedly attached to the shaft, it is possible to swing vertically about the swing center shaft 9°9.

Note that the bearings 17 and 18 are of a vertically divided type, and are assembled using bolts 19.

However, in the conventional mounting structure of the axle center member 10 described above, since the bell crank 5 is arranged inside the axle center member 10, the front and rear swing center shafts 9, 9 are installed at positions apart from each other. Must.

Therefore, it is extremely difficult to provide the swing center shafts 9, 9, which are the center positions of the swing, at coaxial center positions, in terms of machining and assembly accuracy, and this impedes smooth swing movement.

Further, since the swing center shafts 9, 9 are provided on the front and rear sides of the axle center member 100, the ground clearance at the swing center position is low, resulting in poor assembly workability and poor lateral stability.

Furthermore, since the swing center shafts 9, 9 are implanted and supported in the longitudinal direction of the axle center member 100, various problems arise, such as the space occupied in the front and rear of the axle center member becomes large.

The present invention was developed in view of the above, and its purpose is to install a swing center shaft through the cross member on the vehicle body side, and to fix the bearing of this swing center shaft to the upper surface of the axle center member. The axial center accuracy of the swing center shaft is improved by supporting the axle center member in a swingable manner by supporting the axle center member in a swingable manner, consisting of a lower part of the bearing and an upper part of the bearing that is fixed after the swing center shaft is placed on the lower part of the bearing. To provide a mounting structure for an axle center member, which is easy to assemble by increasing the ground clearance of the shaft center position, improves lateral stability, and further reduces the space occupied before and after the axle center member. There is a particular thing.

The present invention will be explained below with reference to embodiments shown in FIGS. 3 to 5.

FIG. 3 shows a first embodiment of the present invention, in which 10 is an axle center member and 16 is a cross member.

This axle center member 10 is similar to that shown in FIG.
, 13 .
(See Figure 1) is supported internally.

In this embodiment, this axle center member 1
0 to the cross member 16 (swing: As a mount structure that can support the cross member 16, a swing center shaft 9', which is a single solid short rod with a circular cross section, is attached to the front and rear surfaces of the support portion of the cross member 16. On the other hand, the axle center member 10 has a pair of bearings 17' and 18' fixedly fixed on its upper surface to fit with the swing center shaft 9'.

The swing center axis γ is fixed to the cross member 16 by welding or the like.

Further, the bearing 17'18' adopts an upper and lower split type, with a lower bearing 17a.

18a is welded to the upper surface of the axle center member 10, and the bearing upper parts 17b and 18b are welded to the corresponding bearing lower parts 17a and 18.
It is fastened and fixed to a with bolts 19.

This axle center member 100 is assembled by setting the swing center shaft 9' on the bearing lower parts 17a and 18a, and then
This is done by tightening the bolts 19 on the bearing upper parts 17b and 18b from above the swing center shaft.

In this embodiment, as described above, the swing center is set above the axle center member avoiding the bell crank mechanism, so the swing center shaft 9' can be constructed as a single shaft, and the shaft center positioning The accuracy of the axle center member 10 can be increased, processing and assembly can be facilitated, and the axle center member 10 can be smoothly swung.

In addition, since the swing center is formed by the swing center shaft 9' and the bearings 17' and 18' on the upper side of the axle center member, the ground clearance at the swing center position can be increased, which improves assembly work efficiency. At the same time, the left and right stability is improved.

Furthermore, by arranging the swing center above the axle center member where there is a relatively large amount of space, the space occupied before and after the axle center is reduced, which is effective in downsizing the forklift.

FIG. 4 shows a second embodiment of the invention.

In this embodiment, the lower part 17a of the bearing 17〃, 18'',
18a respectively to the vertical members 13 of the axle center member 10.
In addition to the same effects as the first embodiment, it also has advantages not found in the previous embodiments, such as a reduction in the number of parts and an increase in bearing strength.

FIG. 5 shows a third embodiment, in which the axle center member 10'
By forming the bearing by casting etc., the upper and lower horizontal members are integrated, the vertical member is not required, and the bearing 1
7″t, 18/// lower part 17a.

18a is also integrally formed.

According to this configuration, it is more effective to reduce the number of parts and the number of processing steps.

In FIGS. 4 and 5, the same or equivalent parts as in FIG. 3 are given the same reference numerals.

As is clear from the above description, in the mounting structure of the axle center member of the present invention, one swing center shaft is provided through the cross member, and the bearing of this swing center shaft is fixed to the upper surface of the axle center member. The structure consists of a lower part of the bearing that is fixed to the lower part of the bearing, and an upper part of the bearing that is fixed after the swing center shaft is placed on the lower part of the bearing. This has practical effects such as increasing the height, making assembly easier, improving lateral stability, and reducing the space occupied before and after the axle center member, allowing forklifts to be made more compact. .

[Brief Description of the Drawings] Figures 1 and 2 respectively show the mounting structure of a conventional axle center member. Figure 1 is a perspective view of the entire steering device, Figure 2 is a perspective view of essential parts, and Figures 3 to FIG. 5 is a perspective view showing different embodiments of the present invention. 1... Steering wheel, 5...
Bell crank, 8...Knuckle arm, 9,9
'...Swing center 110, 10'...
...Axle center member, 16...Cross member, 17, 17'. 1T", 17", 18.18', 18",
18'l...Bearing.

Claims (1)

[Scope of utility model registration request] In a mount structure in which an axle center member that supports the knuckle arms of both the left and right axles of a forklift is swingably supported by a bearing on a cross member of the vehicle body, the swing center shaft is fixed to the cross member in the front and back direction, and this The bearing of the swing center shaft is comprised of a lower bearing portion fixed to the upper surface of the axle center member, and an upper bearing portion fixed after the swing center shaft is placed on the lower bearing portion. Mounting structure for axle center parts on forklifts.