JPS5845922Y2 - Forklift drive shaft pipe installation device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a forklift drive shaft tube mounting device.

Conventionally, as shown in FIG. 2, when attaching the drive shaft tube 1 to the edge of the channel-shaped frame 2, only bolts 3 and nuts 4 were used for fitting and tightening.

In addition, 1, the side wall of the flange portion 1B of the drive shaft tube 1 and the side wall 2A of the channel-shaped frame 2 form a shape that is approximately perpendicular to the contact surface 9 between the drive shaft tube 1 and the channel-shaped frame 2; Each of them was asked to do so one after the other.

Therefore, in order to easily attach the drive shaft tube 1 to the channel-shaped frame 2, the structure had to have a slight gap 5 between the side walls IA and 2A.

As a result of this structure, various defects have occurred as described below.

In FIG. 1, when the mast 6 is tilted back and forth, or when it transitions from running to stopping or from stopping to running, inertia force and reaction force are applied to the tilt cylinder 7.
The drive shaft tube 1 that houses the axle shaft 8 through the base 7A of the mast 6 and the lower end (mast support) 6A of the mast 6
It acts on

Note that when there is a load on the fork 17, the inertial force and reaction force act even more strongly.

Therefore, during the above-mentioned titling operation or braking, relative movement occurs in the front-back direction with respect to the contact surface 9 between the drive shaft tube 1 and the channel-shaped frame 2.

The bolt 3 had to be fastened with a large tightening torque in order to counteract the external force that causes the relative movement.

Therefore, each bearing surface 3A of the bolt 3 and nut 4
, 4A increased, and due to the relative movement, wear occurred on several surfaces, resulting in loosening of the bolts.

Furthermore, as the bolts 3 become loosened, due to the structure described above, the stopping effect between the drive shaft tube 1 and the channel frame 2 is no longer complete, and shear stress is applied to the bolts 3 due to the relative movement that occurs in the front and rear directions. If this phenomenon is repeated for a long period of time, the bolt 3 may break.

The purpose of this proposal is to eliminate the above drawbacks.
It is an object of the present invention to provide a mounting device in which the channel-shaped frame and the drive shaft tube are firmly fixed, eliminating loosening and breakage of bolts, even if an external force is applied to the channel-shaped frame and the drive shaft tube. .

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 3 and 4.

In FIG. 3, the channel-shaped frame 12 is fixed together with a rib 11 to the lower front end of the side frame 10 that supports the upper frame 16. 1B are fitted, and the channel-shaped frame 12 and the flange portion 1B are fastened with bolts 3.

Note that 13 indicates a differential case.

In FIG. 4, the side wall 1 of the flange portion 1B of the drive shaft tube 1
Side walls 12A, 2A of the channel-shaped frame opposite A
A side wall 12A having an inclined surface is formed at one end of the flange portion 1B and a side wall 1 of the channel-shaped frame.
A space is formed between 2A and 2A.

A wedge-shaped member 14 having an inclined surface matching the above-mentioned inclined surface is inserted into the space in the front-rear direction, and tightened with a bolt 15.
is screwed into the screw hole 12 drilled in the end of the channel-shaped frame to fix the wedge-shaped member 14.

Note that the side wall IA at the other end of the side walls 1A and 12A has an inclined surface space.

2A is fastened using the same shape as the prior art.

When the bolts 15 of the wedge-shaped member 14 are tightened, there is no gap between the flange portion 1B of the drive shaft tube 1 and the side walls IA, 2A, and 12A of the channel-shaped frame 2, so that the drive shaft tube 1 and Channel frame 2
Even if an inertial force or a reaction force is applied to the contact surface 9 with the drive shaft tube 1 and the channel-shaped frame 2, the wedge-shaped member 14 is interposed between the side walls IA and 12A, so that the rigid mounting does not cause relative movement. Become.

Note that the bolt hole 14A of the wedge-shaped member 14 is slightly larger than the bolt diameter, so even if the wedge-shaped member 14 is tightened with the bolt 15 with no gap, the bolt 15 and the wedge-shaped member 14 This is to prevent the bolts from hitting inside the bolt hole 14A.

Therefore, by inserting and fastening the wedge-shaped member 14 between the side walls IA and 2A, even if an inertial force or a reaction force acts between the drive shaft tube 1 and the channel-shaped frame 12, there is no force between them. Since fastening is achieved without relative movement, loosening or breakage of the bolt 3 is avoided, ensuring safety when driving a forklift. No need to shape it.

Further, since the bolt 3 does not have to be fastened with an unnecessarily large torque, maintenance work and the like are extremely easy.

Since it exhibits the effects described above and skillfully achieves the intended purpose of the present invention, it can be said to be a highly practical device as a "forklift drive shaft pipe attachment device."

The present invention has been described in detail based on an embodiment in which an inclined surface is formed on the side wall 12A of the channel-shaped frame 12 as a device for mounting the drive shaft tube. The same effect as described above can be obtained even when an inclined surface is formed on one side wall of one flange portion, so the present invention is not limited to the embodiments.

[Brief explanation of the drawing]

Figure 1 is a side view showing how the tilt cylinder, drive shaft tube and channel frame are installed, Figure 2 is a cross-sectional view showing the device with conventional drive shaft tube installation, and Figure 3 is the drive shaft tube of the present invention. The installation is a plan view showing the main parts of the device, and FIG. 4 is a side view taken along the line AA in FIG. 3. 1... IJA moving shaft W, 12... Channel-shaped frame, 14... Wedge-shaped member.

Claims (1)

[Scope of utility model registration request] A sloped surface is formed on one of the side walls of the channel-shaped frame at both ends where the channel groove of the channel-shaped frame fixed to the side frame faces the flange of the drive shaft tube that is fitted and fastened to the groove. is provided to form a space between the side wall and the side wall of the flange portion of the drive shaft tube, and a wedge-shaped member having an inclined surface that matches the inclined surface of the side wall is fitted into the space, and the wedge-shaped member is inserted into the space. A forklift drive shaft tube installation device characterized by being fastened to a channel-shaped frame.